This is a good article. Click here for more information.

Corvus (constellation)

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Abbreviation Crv
Genitive Corvi
Pronunciation /ˈkɔːrvəs/,
genitive /ˈkɔːrv/
Symbolism the Crow/Raven
Right ascension 12
Declination −20
Family Hercules
Quadrant SQ3
Area 184 sq. deg. (70th)
Main stars 4
Stars with planets 3
Stars brighter than 3.00m 3
Stars within 10.00 pc (32.62 ly) 1
Brightest star γ Crv (Gienah) (2.59m)
Nearest star Ross 695
(28.99 ly, 8.89 pc)
Messier objects 0
Meteor showers Corvids
Eta Corvids
Visible at latitudes between +60° and −90°.
Best visible at 21:00 (9 p.m.) during the month of May.

Corvus is a small constellation in the Southern Celestial Hemisphere. Its name means "raven" in Latin. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it depicts a raven that has been associated with the god Apollo and is perched on the back of Hydra the water snake. The four brightest stars, Gamma, Delta, Epsilon, and Beta Corvi form a distinctive quadrilateral in the night sky.

With an apparent magnitude of 2.59, Gamma Corvi—also known as Gienah—is the brightest star in the constellation. It is an aging blue giant around 4 times as massive as the Sun. The young star Eta Corvi has been found to have two debris disks. Three star systems have exoplanets, and a fourth planetary system is unconfirmed. TV Corvi is a dwarf nova—a white dwarf and brown dwarf in very close orbit.

History and mythology[edit]

Corvus, Crater, and other constellations seen around Hydra in Urania's Mirror (1825).

In the Babylonian star catalogues dating from at least 1100 BCE, what later became Corvus was known as the Babylonian Raven (MUL.UGA.MUSHEN).[1] It was similarly placed sitting on the tail of the Serpent (Greek Hydra). The Babylonian constellation was sacred to Adad, the god of rain and storm; in the second Millennium it would have risen just before the start of the autumnal rainy season. John H. Rogers suggests that Corvus and Crater marked the gate to the Underworld.[1] These two constellations, along with the eagle Aquila and the fish Piscis Austrinus, were introduced to the Greeks around 500 BCE.[2]

One myth associated with Corvus is that of Apollo and Coronis. Coronis had been unfaithful to her lover, who learned this information from a pure white crow. Apollo then turned its feathers black in a fit of rage.[3] Another legend associated with Corvus is that a crow stopped on his way to fetch water for Apollo, in order to eat figs. Instead of telling the truth to Apollo, he lied and said that a snake, Hydra, kept him from the water, while holding a snake in his talons as proof. Apollo saw this to be a lie, however, and flung the crow (Corvus), cup (Crater), and the snake (Hydra) into the sky. He further punished the wayward bird by making sure that it would forever be thirsty, both in real life and in the heavens, where the Cup is barely out of reach.[3]

In other cultures[edit]

In Chinese astronomy, the stars of Corvus are located within the Vermilion Bird of the South (南方朱雀, Nán Fāng Zhū Què).[4] The four main stars depict a chariot, Zhen, which is the 28th and final lunar mansion, while Alpha and Eta mark the linchpins for the wheels, and Zeta is Changsha, a coffin.[5] In Indian astronomy, the five main stars of Corvus represent a hand or fist and correspond to the Hastā, the 13th nakshatra or lunar mansion.[6]

Corvus was recognized as a constellation by several Polynesian cultures. In the Marquesas Islands, it was called Mee; in Pukapuka, it was called Te Manu, and in the Society Islands, it was called Metua-ai-papa.[7] To Torres Strait Islanders, Corvus was the right hand (holding kupa fruit) of the huge constellation Tagai, a man fishing.[8]

The Bororo people of Mato Grosso in central Brazil regarded the constellation as a land tortoise Geriguigui,[9] while the Tucano people of the northwestern Amazon region saw it as an egret.[10] To the Tupi people of São Luís Island in Brazil, Corvus was seen as a grill or barbecue—seychouioura, on which fish were grilled. However, the depiction could have also referred to the Great Square of Pegasus.[11]


Covering 184 square degrees and hence 0.446% of the sky, Corvus ranks 70th of the 88 constellations in area.[12] It is bordered by Virgo to the north and east, Hydra to the south, and Crater to the west. The three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is 'Crv'.[13] The official constellation boundaries, as set by Eugène Delporte in 1930,[a] are defined by a polygon of six segments (illustrated in infobox). In the equatorial coordinate system, the right ascension coordinates of these borders lie between 11h 56m 22s and 12h 56m 40s, while the declination coordinates are between −11.68° and −25.20°.[15] Its position in the Southern Celestial Hemisphere means that the whole constellation is visible to observers south of 65°N.[12][b]


The constellation Corvus as it can be seen by the naked eye.


The German cartographer Johann Bayer used the Greek letters Alpha through Eta to label the most prominent stars in the constellation. John Flamsteed gave nine stars Flamsteed designations, while one star he designated in the neighbouring constellation Crater—31 Crateris—ended up in Corvus.[16] Within the constellation's borders, there are 29 stars brighter than or equal to apparent magnitude 6.5.[c][12]

Four principal stars, Delta, Gamma, Epsilon, and Beta Corvi, form a quadrilateral asterism known as "the "Spica's Spanker"[18] or "the Sail".[19][20] Although none of the stars are particularly bright, they lie in a dim area of the sky, rendering the asterism easy to distinguish in the night sky.[21] Gamma and Delta serve as pointers toward Spica. Also called Gienah, Gamma is the brightest star in Corvus at magnitude 2.59.[22] Its traditional name means "wing",[22] the star marking the left wing in Bayer's Uranometria.[16] 154±1 light-years from Earth,[23] it is a blue-white hued giant star of spectral type B8III that is 4.2+0.4
times as massive,[24] and 355 times as luminous as the Sun.[22] Around 160+40
million years old,[24] it has exhausted its core hydrogen and begun expanding and cooling as it moves away from the main sequence.[22] A binary star, it has a companion orange or red dwarf star of spectral type K5V to M5V that is about 0.8 times as massive as the Sun.[25] Around 50 astronomical units[d] distant from Gamma Corvi A, it is estimated to complete an orbit in 158 years.[24] Delta Corvi, traditionally called Algorab, is a double star divisible in small amateur telescopes. The primary is a blue-white star of magnitude 2.9, around 87 light-years from Earth.[23] An enigmatic star around 2.7 times as massive as the Sun, it is more luminous (65–70 times that of the Sun) than its should be for its surface temperature of 10,400 K, and hence is either a 3.2 million year-old very young pre-main sequence star that has not settled down to a stable main sequence life stage, or a 260 million year-old star that has begun to exhaust its core hydrogen and expand, cool and shine more brightly as it moves away from the main sequence. Its spectral type is given as A0IV, corresponding with the latter scenario.[26] Warm circumstellar dust—by definition part of its inner stellar system—has been detected around Delta Corvi A.[27] Delta Corvi B is an orange dwarf star of magnitude 8.51 and spectral class K, also surrounded by circumstellar dust. A post T-tauri star, it is at least 650 AU distant from its brighter companion and takes at least 9400 years to complete an orbit.[28] Delta Corvi's common name means "the raven".[3] It is one of two stars marking the right wing.[16] Located 4.5 degrees northeast of Delta Corvi is Struve 1669, a binary star that is divisible into two stars 5.4" apart by small amateur telescopes,[29] 280 light-years from Earth. The pair, both white stars, is visible to the naked eye at magnitude 5.2; the primary is of magnitude 5.9 and the secondary is of magnitude 6.0.[3]

The raven's breast is marked by Beta Corvi,[16] a star of magnitude 2.7 located 146 ± 1 light-years from Earth.[23] Roughly 206 million years old and 3.7 ± 1 times as massive as the Sun, it has exhausted its core hydrogen and expanded and cooled to a surface temperature of around 5,100 K and is now a yellow bright giant star of spectral type G5II.[30] It likely spent most of its existence as a blue-white main sequence star of spectral type B7V.[31] Bearing the proper name of Minkar and marking the raven's nostril is Epsilon Corvi, located some 318 ± 5 light-years from Earth.[23] It is a red giant of spectral type K2III that is around 54 times the Sun's radius and 930 times its luminosity.[32] Around 4 times as massive as the Sun, it spent much of its life as a main sequence star of spectral type B5V.[33] Lying to the south of the quadrilateral between Beta and Epsilon Corvi is the orange-hued 6 Corvi,[21] and ageing giant star of spectral type K1III that is around 70 times as luminous as the Sun.[34] It is 331 ± 10 light-years away from Earth.[23]

Also called Alchiba, Alpha Corvi is a white-hued star of spectral type F1V and magnitude 4.0, 48.7 ± 0.1 light-years from Earth.[23] It exhibits periodic changes in its spectrum over a three-day period, which suggests it is either a spectroscopic binary or (more likely) a pulsating Gamma Doradus-type variable. If the latter is the case, it is estimated to be 1.39 times as massive as the Sun.[35] According to Bayer's atlas, it lies above the bird's beak.[16]

Also marking the raven's right wing is Eta Corvi,[16] a yellow-white main sequence star that is 1.52 times as massive and 4.87 times as luminous as the Sun. It is 59 light-years distant from our Solar System.[36] Two debris disks have been detected orbiting this star, one warm within 3.5 astronomical units and another out at ~150 astronomical units distant.[37][38] Zeta Corvi marks the raven's neck.[16] It is of apparent magnitude 5.21, separated by 7 arcseconds from the star HR 4691.[39] Located 420 ± 10 light-years distant,[23] it is a blue-white Be star of spectral type B8V, the presence of hydrogen emission lines in its spectrum indicating it has a circumstellar disc. These stars may be an optical double or a true multiple star system, with a separation of at least 50,000 astronomical units and the stars taking 3.5 million years to orbit each other. HR 4691 is itself double, composed of an ageing yellow-orange giant whose spectral type has been calculated at K0 or G3, and an F-type main sequence star.[39]

31 Crateris (which was originally placed in Crater by Flamsteed) is a 5.26 magnitude star which was once mistaken for a moon of Mercury. It is in reality a remote binary star system with a hot blue-white star of spectral type B1.5V and a companion about which little is known. The two stars orbit each other every 2.9631 days. The primary is possibly a blue straggler of the Hyades group.[40] The primary is around 15.5 times as massive as the Sun and 52262 times as luminous.[41]

VV Corvi is a close spectroscopic binary, its two component stars orbiting each other with a period of 1.46 days.[42] Both are yellow-white main sequence stars of spectral type F5V, though the primary has begun expanding and cooling as it nears the end of its time on the main sequence.[43] The mass ratio of the two stars is 0.775±0.024.[44] A tertiary companion was discovered during the Two Micron All-Sky Survey.[45] W Corvi is an eclipsing binary that varies in brightness from apparent magnitude 11.16 to 12.5 over 9 hours.[46] Its period has increased by 1/4 second over a century. It is an unusual system in that its two stars are very close to each other yet have different surface temperatures and hence thermal transfer is not taking place as expected.[47] SX Corvi is an eclipsing binary that is also a contact binary also known as a W Ursae Majoris variable. The two component stars orbit closely enough to each other for mass to have been transferred between them—in this case the secondary having transferred a large amount of mass to the primary.[48] RV Corvi is another eclipsing binary. Its brightness varies from apparent magnitude 8.6 to 9.16 over 18 hours.[49] The system is composed of stars of spectral types F0 and G0, which orbit each other every 0.7473 days.[50]

Close to Gamma Corvi and visible in the same binocular field is R Corvi, a long period (Mira) variable star.[51] It ranges in brightness from a magnitude of 6.7 to 14.4 with a period of approximately 317 days.[52] TT Corvi is a Semiregular variable red giant of spectral type M3III and apparent magnitude 6.48 around 923 light years distant.[53] It is around 993 times as luminous as of the Sun.[34] TU Corvi is a Delta Scuti variable—a class of short period (six hours at most) pulsating stars that have been used as standard candles and as subjects to study astroseismology.[54] It varies by 0.025 of a magnitude around apparent magnitude 6.53 over 59 minutes.[55]

Three star systems have confirmed planets. HD 103774 is a young yellow-white main-sequence star of apparent magnitude 7.12 that is 181 ± 5 light-years distant from Earth. It is 1.335 ± 0.03 times as massive and 3.5 ± 0.3 as luminous as the Sun. Variations in its radial velocity showed it was being orbited by a Neptune-sized planet every 5.9 days in 2013.[56] HD 104067 is an orange dwarf of spectral type K2V of apparent magnitude 7.93 that is 69 ± 1 light-years distant from Earth. Around 80% as massive as the Sun, it is orbited by a planet 3.6 times the mass of Neptune every 55.8 days.[57] WASP-83 has a planet around as massive as Saturn that orbits it every 5 days. It was discovered by its transit across the star in 2015.[58] A fourth star system has an unconfirmed planet. HD 111031 is a sunlike star of spectral type G5V located 101 ± 2 light-years distant from Earth.[23]

VHS 1256-1257 is a brown dwarf of spectral type M7.5 located 41 ± 3 light-years distant from Earth. Around 73 times as massive as Jupiter, it is just under the boundary between brown dwarves and stars. It has a companion that was first identified and documented by the 2MASS survey in 2015. It orbits at a distance of 102 ± 9 AU and has an estimated mass of approximately 11 times Jupiter's,[59] DENIS-P J1228.2-1547 is a system composed of two brown dwarfs orbiting each other. TV Corvi is a dwarf nova composed of a white dwarf and brown dwarf that orbit each other every 90 minutes.[60][61] The system has a baseline magnitude of 17 that brightens periodically to magnitude 12, discovered by Clyde Tombaugh in 1931 and David Levy in 1990 and 2005.[62]

Deep-sky objects[edit]

Corvus contains no Messier objects. It has several galaxies and a planetary nebular observable with amateur telescopes.[63] The center of Corvus is home to a planetary nebula NGC 4361.[63] The nebula itself resembles a small elliptical galaxy and has a magnitude of 10.3, but the magnitude 13 star at its centre gives away its true nature.[51]

The NGC 4038 Group is a group of galaxies across Corvus and Crater. The group may contain between 13 and 27 galaxies. The best-known member is the Antennae peculiar galaxy, located 0.25 north of 31 Crateris.[64] It consists of two interacting galaxies—NGC 4038 and 4039—that appear to have a heart shape as seen from Earth. The name originates from the huge tidal tails that come off the ends of the two galaxies, formed because of the spiral galaxies' original rotation. Both original galaxies were spiral galaxies and are now experiencing extensive star formation due to the interaction of gas clouds. The galaxies are 45 million light-years from Earth and each has multiple ultraluminous X-ray sources, the source of which is unknown. Astronomers theorize that they may be a rare type of x-ray emitting binary stars or intermediate-mass black holes.[65] The Antennae galaxies appear in a telescope at the 10th magnitude.[3] SN 2004gt was a type Ic supernova that erupted on December 12, 2004. The progenitor was not identified from older images of the galaxy, and is either a type WC Wolf-Rayet star with a mass over 40 times that of the Sun, or a star 20 to 40 times as massive as the Sun in a binary star system.[66] SN 2007sr was a Type Ia supernova event that peaked in brightness on December 14, 2007.[67] The galaxy has been identified as a good place to take detailed images in case of further supernovae.[66]

NGC 4027 is another member of the NGC 4038 group, notable for its extended spiral arm. Known as the Ringtail Galaxy, it lies close to 31 Crateris.[64] A barred spiral galaxy, its distorted shape is probably due to a past collision, possibly with the nearby NGC 4027A. NGC 4782 and NGC 4783 are a pair of merging elliptical galaxies in the northeastern part of the constellation, around 200 million light-years distant.[62]

Meteor showers[edit]

Corvus hosts two established meteor showers. German astronomer Cuno Hoffmeister discovered and named the Corvids in 1937, after observing them between June 25 and July 2. However, they have not been seen since nor was there evidence of a shower when previous records were examined. Hoffmeister noted the trajectory of the shower was similar to that of the comet 11P/Tempel–Swift–LINEAR, though this was not confirmed by Zhukov and colleagues in 2011. The shower has also been tentatively linked with 4015 Wilson–Harrington.[68] In January 2013, the MO Video Meteor Network published the discovery of the Eta Corvids, assigning some 300 meteors seen between January 20 and 26.[69] Their existence was confirmed by data analysis later that year.[70]

Popular culture[edit]

In 1624, German astronomer Jakob Bartsch equated the constellation Argo Navis with Noah's Ark, linking Corvus and Columba to the crow and dove that feature in the story in the Book of Genesis.[71]

In Action Comics #14 (January 2013), which was published 7 November 2012, Neil Degrasse Tyson appears in the story, in which he determines that Superman's home planet, Krypton, orbited the red dwarf LHS 2520 in the constellation Corvus, 27.1 light-years from Earth. Tyson assisted DC Comics in selecting a real-life star that would be an appropriate parent star to Krypton, and picked the star in Corvus,[72][73] and which is the mascot of Superman's high school, the Smallville Crows.[74]

See also[edit]


  1. ^ Delporte had proposed standardising the constellation boundaries to the International Astronomical Union, who had agreed and gave him the lead role[14]
  2. ^ While parts of the constellation technically rise above the horizon to observers between the 65°N and 78°N, stars within a few degrees of the horizon are to all intents and purposes unobservable.[12]
  3. ^ Objects of magnitude 6.5 are among the faintest visible to the unaided eye in suburban-rural transition night skies.[17]
  4. ^ the distance between the Earth and the Sun is one astronomical unit


  1. ^ a b Rogers, John H. (1998). "Origins of the Ancient Constellations: I. The Mesopotamian Traditions". Journal of the British Astronomical Association. 108: 9–28. Bibcode:1998JBAA..108....9R. 
  2. ^ Frank, Roslyn M. (2015). "10: Origins of the "Western" Constellations". Handbook of Archaeoastronomy and Ethnoastronomy (PDF). New York, New York: Springer. pp. 147–63. 
  3. ^ a b c d e Ridpath & Tirion 2001, pp. 128–130.
  4. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 22 日
  5. ^ Ridpath, Ian. "Corvus and Crater". Star Tales. self-published. Retrieved 6 June 2015. 
  6. ^ Harness, Dennis M. (2004). The Nakshastras: The Lunar Mansions of Vedic Astrology. Motilal Banarsidass Publ. p. 51. ISBN 978-81-208-2068-5. 
  7. ^ Makemson, Maud Worcester (1941). The Morning Star Rises: an account of Polynesian astronomy. Yale University Press. 
  8. ^ Haddon, Alfred Cort (1912). Reports of the Cambridge Anthropological Expedition to Torres Straits: Volume 4 of Reports of the Cambridge Anthropological Expedition to Torres Straits. CUP Press. p. 219. 
  9. ^ Fabian, Stephen M. (1982). "Ethnoastronomy of the Eastern Bororo Indians of Mato Grosso, Brazil". Annals of the New York Academy of Sciences. 385 (1): 283–301. Bibcode:1982NYASA.385..283F. doi:10.1111/j.1749-6632.1982.tb34270.x. 
  10. ^ Cardoso, Walmir (2016). "Constellations and Time Keeping used by Indigenous Communities in the Northwestern Amazonian Region". Journal of Astronomy in Culture. 1 (1). 
  11. ^ Magana, Edmundo (1984). "Some Tupi Constellations". Ibero-amerikanisches Archiv. 10 (2): 189–221. JSTOR 43392390. 
  12. ^ a b c d Ian Ridpath. "Constellations: Andromeda–Indus". Star Tales. self-published. Retrieved 9 September 2014. 
  13. ^ Russell, Henry Norris (1922). "The New International Symbols for the Constellations". Popular Astronomy. 30: 469. Bibcode:1922PA.....30..469R. 
  14. ^ Ridpath, Ian. "Constellation boundaries: How the modern constellation outlines came to be". Star Tales. self-published. Retrieved 1 June 2016. 
  15. ^ "Corvus, Constellation Boundary". The Constellations. International Astronomical Union. Retrieved 12 November 2014. 
  16. ^ a b c d e f g Wagman, Morton (2003). Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg, Virginia: The McDonald & Woodward Publishing Company. pp. 119, 387, 390–91, 506. ISBN 978-0-939923-78-6. 
  17. ^ Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Sky Publishing Corporation. Retrieved 6 June 2015. 
  18. ^ Nickel, James (1999). Lift Up Your Eyes on High: Understanding the Stars. Arlington Heights, Illinois: Christian Liberty Press. p. 53. ISBN 9781930367371. 
  19. ^ Bakich, Michael E. (1995). The Cambridge Guide to the Constellations. Cambridge, United Kingdom: Cambridge University Press. pp. 21–22. ISBN 978-0521465205. 
  20. ^ Mullaney, James (2007). The Herschel objects and how to observe them. New York, New York: Springer Science+Business Media. p. 39. ISBN 9780387681245. 
  21. ^ a b Arnold, H.J.P; Doherty, Paul; Moore, Patrick (1999). The Photographic Atlas of the Stars. Boca Raton, Florida: CRC Press. p. 140. ISBN 978-0-7503-0654-6. 
  22. ^ a b c d Kaler, James B. (Jim) (2004). "Gienah Corvi". Stars. University of Illinois. Retrieved 18 March 2015. 
  23. ^ a b c d e f g h van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  24. ^ a b c Janson, Markus; Bonavita, Mariangela; Klahr, Hubert; Lafrenière, David; Jayawardhana, Ray; Zinnecker, Hans (2011). "High-contrast Imaging Search for Planets and Brown Dwarfs around the Most Massive Stars in the Solar Neighborhood". The Astrophysical Journal. 736 (2): 89. arXiv:1105.2577Freely accessible. Bibcode:2011ApJ...736...89J. doi:10.1088/0004-637X/736/2/89. 
  25. ^ Roberts, Lewis C. Jr.; Turner, Nils H.; ten Brummelaar, Theo A. (February 2007). "Adaptive Optics Photometry and Astrometry of Binary Stars. II. A Multiplicity Survey of B Stars". The Astronomical Journal. 133 (2): 545–552. Bibcode:2007AJ....133..545R. doi:10.1086/510335. 
  26. ^ Montesinos, B.; Eiroa, C.; Mora, A.; Merín, B. (2009). "Parameters of Herbig Ae/Be and Vega-type stars". Astronomy and Astrophysics. 495 (3): 901–17. arXiv:0811.3557Freely accessible. Bibcode:2009A&A...495..901M. doi:10.1051/0004-6361:200810623. 
  27. ^ Ertel, S.; Absil, O.; Defrère, D.; Le Bouquin, J.-B.; Augereau, J.-C.; Marion, L.; Blind, N.; Bonsor, A.; Bryden, G.; Lebreton, J.; Milli, J. (2014). "A near-infrared interferometric survey of debris-disk stars. IV. An unbiased sample of 92 southern stars observed in H band with VLTI/PIONIER". Astronomy & Astrophysics. 570: 20. arXiv:1409.6143Freely accessible. Bibcode:2014A&A...570A.128E. doi:10.1051/0004-6361/201424438. A128. 
  28. ^ Kaler, James B. (Jim) (2000). "Algorab". Stars. University of Illinois. Retrieved 25 July 2015. 
  29. ^ Bakich, Michael E. (2010). 1,001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers. The Patrick Moore Practical Astronomy Series. New York, New York: Springer Science & Business Media. pp. 135–36. ISBN 1-4419-1777-2. 
  30. ^ Lyubimkov, Leonid S.; Lambert, David L.; Rostopchin, Sergey I.; Rachkovskaya, Tamara M.; Poklad, Dmitry B. (February 2010). "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 402 (2): 1369–1379. arXiv:0911.1335Freely accessible. Bibcode:2010MNRAS.402.1369L. doi:10.1111/j.1365-2966.2009.15979.x. 
  31. ^ Kaler, James B. (Jim). "Kraz". Stars. University of Illinois. Retrieved 25 July 2015. 
  32. ^ Aurière, M.; Konstantinova-Antova, R.; Charbonnel, C.; Wade, G. A.; Tsvetkova, S.; Petit, P.; Dintrans, B.; Drake, N. A.; Decressin, T.; Lagarde, N.; Donati, J.-F.; Roudier, T.; Lignières, F.; Schröder, K.-P.; Landstreet, J. D.; Lèbre, A.; Weiss, W. W.; Zahn, J.-P. (2015). "The magnetic fields at the surface of active single G-K giants". Astronomy & Astrophysics. 574: 30. arXiv:1411.6230Freely accessible. Bibcode:2015A&A...574A..90A. doi:10.1051/0004-6361/201424579. A90. 
  33. ^ Kaler, James B. (Jim). "Minkar". Stars. University of Illinois. Retrieved 12 July 2015. 
  34. ^ a b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. 
  35. ^ Fuhrmann, K.; Chini, R. (2012). "Multiplicity among F-type Stars". The Astrophysical Journal Supplement. 203 (2): 20. Bibcode:2012ApJS..203...30F. doi:10.1088/0067-0049/203/2/30. 30. 
  36. ^ Pawellek, Nicole; Krivov, Alexander V.; Marshall, Jonathan P.; Montesinos, Benjamin; Ábrahám, Péter; Moór, Attila; Bryden, Geoffrey; Eiroa, Carlos (2014). "Disk Radii and Grain Sizes in Herschel-resolved Debris Disks". The Astrophysical Journal. 792 (1): 19. arXiv:1407.4579Freely accessible. Bibcode:2014ApJ...792...65P. doi:10.1088/0004-637X/792/1/65. 65. 
  37. ^ Smith, R. (2008). "The nature of mid-infrared excesses from hot dust around Sun-like stars". Astronomy and Astrophysics. 485 (3): 897–915. arXiv:0804.4580Freely accessible. Bibcode:2008A&A...485..897S. doi:10.1051/0004-6361:20078719. 
  38. ^ Wyatt, M. C. (2005). "Submillimeter Images of a Dusty Kuiper Belt around η Corvi". The Astrophysical Journal. 620 (1): 492–500. arXiv:astro-ph/0411061Freely accessible. Bibcode:2005ApJ...620..492W. doi:10.1086/426929. 
  39. ^ a b Kaler, James B. (Jim) (26 April 2013). "Zeta Corvi". Stars. University of Illinois. Retrieved 18 March 2015. 
  40. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  41. ^ Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349–360, arXiv:1003.2335Freely accessible, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355 
  42. ^ Batten, A. H. (1967). "Sixth catalogue of the orbital elements of spectroscopic binary systems". Publications of the Dominion Astrophysical Observatory, Victoria. 13: 119–251. Bibcode:1967PDAO...13..119B. 
  43. ^ Fekel, Francis C.; Henry, Gregory W.; Sowell, James R. (2013). "Absolute Properties of the Eclipsing Binary VV Corvi". The Astronomical Journal. 146 (6): 9. Bibcode:2013AJ....146..146F. doi:10.1088/0004-6256/146/6/146. 146. 
  44. ^ Lucy, L. B.; Ricco, E. (March 1979). "The significance of binaries with nearly identical components". Astronomical Journal. 84: 401–412. Bibcode:1979AJ.....84..401L. doi:10.1086/112434. 
  45. ^ Tokovinin, A.; Thomas, S.; Sterzik, M.; Udry, S. (2008). "Tertiary companions to close spectroscopic binaries". Multiple Stars Across the H-R Diagram, ESO Astrophysics Symposia. Berlin Heidelberg. p. 129. arXiv:astro-ph/0601518Freely accessible. ISBN 978-3-540-74744-4. 
  46. ^ Watson, Christopher (4 January 2010). "W Corvi". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 21 July 2015. 
  47. ^ Odell, Andrew P. (1996). "Changes in the Period and Light Curve of W Corvi". Monthly Notices of the Royal Astronomical Society. 282 (2): 373–83. Bibcode:1996MNRAS.282..373O. doi:10.1093/mnras/282.2.373. 
  48. ^ Yildiz (2014). "Origin of W UMa-type contact binaries – age and orbital evolution". Monthly Notices of the Royal Astronomical Society. 437 (1): 185–94. arXiv:1310.5526Freely accessible. Bibcode:2014MNRAS.437..185Y. doi:10.1093/mnras/stt1874. 
  49. ^ Watson, Christopher (4 January 2010). "RV Corvi". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 21 July 2015. 
  50. ^ Malkov, O. Yu.; Oblak, E.; Snegireva, E. A.; Torra, J. (2006). "A catalogue of eclipsing variables". Astronomy and Astrophysics. 446 (2): 785–89. Bibcode:2006A&A...446..785M. doi:10.1051/0004-6361:20053137. 
  51. ^ a b Garfinkle, Robert A. (1997). Star-Hopping: Your Visa to Viewing the Universe. Cambridge University Press. p. 108. ISBN 0-521-59889-3. 
  52. ^ VSX (4 January 2010). "R Corvi". AAVSO Website. American Association of Variable Star Observers. Retrieved 24 May 2014. 
  53. ^ Tabur, V.; Bedding, T. R. (2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society. 400 (4): 1945–61. arXiv:0908.3228Freely accessible. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x. 
  54. ^ Templeton, Matthew (16 July 2010). "Delta Scuti and the Delta Scuti Variables". Variable Star of the Season. AAVSO (American Association of Variable Star Observers). Retrieved 21 July 2015. 
  55. ^ Watson, Christopher (4 January 2010). "TU Corvi". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 21 July 2015. 
  56. ^ Lo Curto, G.; Mayor, M.; Benz, W.; Bouchy, F.; Hébrard, G.; Lovis, C.; Moutou, C.; Naef, D.; Pepe, F.; Queloz, D.; Santos, N. C.; Segransan, D.; Udry, S. (2013). "The HARPS search for southern extrasolar planets: XXXVI. New multi-planet systems in the HARPS volume limited sample: a super-Earth and a Neptune in the habitable zone". Astronomy & Astrophysics. 551: 7. arXiv:1301.2741Freely accessible. Bibcode:2013A&A...551A..59L. doi:10.1051/0004-6361/201220415. A59. 
  57. ^ Ségransan, D.; et al. (2011). "The HARPS search for southern extra-solar planets. XXIX. Four new planets in orbit around the moderately active dwarfs HD 63765, HD 104067, HD 125595, and HIP 70849". Astronomy and Astrophysics. 535. A54. arXiv:1107.0339Freely accessible. Bibcode:2011A&A...535A..54S. doi:10.1051/0004-6361/200913580. 
  58. ^ Hellier, Coel; Anderson, D. R.; Collier Cameron, A.; Delrez, L.; Gillon, M.; Jehin, E.; Lendl, M.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, B.; Smith, A. M. S.; Southworth, J.; Triaud, A. H. M. J.; Turner, O. D.; Udry, S.; West, R. G. (2015). "Three WASP-South Transiting Exoplanets: WASP-74b, WASP-83b, and WASP-89b". The Astronomical Journal. 150 (1): 9. Bibcode:2015AJ....150...18H. doi:10.1088/0004-6256/150/1/18. 18. 
  59. ^ Gauza, Bartosz; Béjar, Victor J. S.; Pérez-Garrido, Antonio; Maria Rosa Zapatero Osorio; Lodieu, Nicolas; Rebolo, Rafael; Pallé, Enric; Nowak, Grzegorz (2015). "Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9". The Astrophysical Journal. 804 (2): 96. arXiv:1505.00806Freely accessible. Bibcode:2015ApJ...804...96G. doi:10.1088/0004-637X/804/2/96. 
  60. ^ Levy, David H. (2015). "Some Personal Thoughts on TV Corvi" (PDF). JAAVSO. 43 (1): 102–04. 
  61. ^ Knigge, Christian (2006). "The donor stars of cataclysmic variables". Monthly Notices of the Royal Astronomical Society. 373 (2): 484–502. arXiv:astro-ph/0609671Freely accessible. Bibcode:2006MNRAS.373..484K. doi:10.1111/j.1365-2966.2006.11096.x. 
  62. ^ a b Streicher, Magda (2008). "Deepsky Delights: A Crow named Corvus". Monthly Notes of the Astronomical Society of Southern Africa. 67 (3–4): 63–66. Bibcode:2008MNSSA..67...63S. 
  63. ^ a b Luginbuhl, Christian B.; Skiff, Brian A. (1998). Observing Handbook and Catalogue of Deep-Sky Objects. Cambridge, United Kingdom: Cambridge University Press. p. 93. ISBN 978-0-521-62556-2. 
  64. ^ a b O'Meara, Stephen James (2002). The Caldwell Objects. Cambridge University Press. pp. 240–43. ISBN 978-0-521-82796-6. 
  65. ^ Wilkins, Jamie; Dunn, Robert (2006). 300 Astronomical Objects: A Visual Reference to the Universe. Buffalo, New York: Firefly Books. ISBN 978-1-55407-175-3. 
  66. ^ a b Maund, Justyn R.; Smartt, Stephen J.; Schweizer, Francois (2005). "Luminosity and Mass Limits for the Progenitor of the Type Ic Supernova 2004gt in NGC 4038". The Astrophysical Journal. 630 (1): L33–L36. arXiv:astro-ph/0506436Freely accessible. Bibcode:2005ApJ...630L..33M. doi:10.1086/491620. 
  67. ^ Pojmanski, G.; Prieto, J. L.; Stanek, K. Z.; Beacom, J. F. (2008). Green, D. W. E., ed. "Supernova 2007sr in NGC 4038". Central Bureau Electronic Telegrams (1213): 1. Bibcode:2008CBET.1213....1P. 
  68. ^ Kronk, Gary R. (2013). Meteor Showers: An Annotated Catalog. New York, New York: Springer Science & Business Media. p. 114. ISBN 978-1-4614-7897-3. 
  69. ^ Molau, Sirko; Kac, Javor; Berko, Erno; Crivello, Stefano; Stomeo, Enrico; Igaz, Antal; Barentsen, Geert; Goncalves, Rui (2013). "Results of the IMO Video Meteor Network – January 2013". WGN, Journal of the International Meteor Organization. 41 (2): 61–66. Bibcode:2013JIMO...41...61M. 
  70. ^ Kornoš, L.; Matlovič, P.; Rudawska, R.; Tóth, J.; Hajduková, M. Jr.; Koukal, J.; Piffl, R. (2014). T.J. Jopek; F.J.M. Rietmeijer; J. Watanabe; I.P. Williams, eds. "Confirmation and characterization of IAU temporary meteor showers in EDMOND database". The Meteoroids 2013, Proceedings of the Astronomical Conference held at A.M. University, Poznań, Poland, Aug. 26–30, 2013. A.M. University Press: 225–233. Bibcode:2014me13.conf..225K. 
  71. ^ Barentine, John C. (2016). The Lost Constellations. Switzerland: Springer International Publishing. p. 67. ISBN 978-3-319-22794-8. 
  72. ^ Wall, Mike (7 November 2012). "Superman's Home Planet Krypton 'Found'". Scientific American. 
  73. ^ Potter, Ned (5 November 2012). "Superman Home: Planet Krypton 'Found' in Sky". abc news website. ABC News Internet Ventures. Retrieved 31 October 2014. 
  74. ^ Gregorian, Dareh (5 November 2012). "NYER is 'super' smart". New York Post. Retrieved 31 October 2014. 


  • Ridpath, Ian; Tirion, Wil (2001), Stars and Planets Guide, Princeton University Press, ISBN 0-691-08913-2 

External links[edit]

Coordinates: Sky map 12h 00m 00s, −20° 00′ 00″