|Pronunciation||//, genitive //|
|Area||947 sq. deg. (12th)|
|Main stars||9, 15|
|Stars with planets||13|
|Stars brighter than 3.00m||5|
|Stars within 10.00 pc (32.62 ly)||5|
|Brightest star||Regulus (α Leo) (1.35m)|
|Visible at latitudes between +90° and −65°.|
Best visible at 21:00 (9 p.m.) during the month of April.
Leo // is one of the constellations of the zodiac, between Cancer the crab to the west and Virgo the maiden to the east. It is located in the Northern celestial hemisphere. Its name is Latin for lion, and to the ancient Greeks represented the Nemean Lion killed by the mythical Greek hero Heracles meaning 'Glory of Hera' (known to the ancient Romans as Hercules) as one of his twelve labors. Its old astronomical symbol is (♌︎). One of the 48 constellations described by the 2nd-century astronomer Ptolemy, Leo remains one of the 88 modern constellations today, and one of the most easily recognizable due to its many bright stars and a distinctive shape that is reminiscent of the crouching lion it depicts. The lion's mane and shoulders also form an asterism known as "The Sickle," which to modern observers may resemble a backwards "question mark."
Leo contains many bright stars, many of which were individually identified by the ancients. There are four stars of the first or second magnitude, which render this constellation especially prominent:
- Regulus, designated Alpha Leonis, is a blue-white main-sequence star of magnitude 1.34, 77.5 light-years from Earth. It is a double star divisible in binoculars, with a secondary of magnitude 7.7. Its traditional name (Regulus) means "the little king".
- Beta Leonis, called Denebola, is at the opposite end of the constellation to Regulus. It is a blue-white star of magnitude 2.23, 36 light-years from Earth. The name Denebola means "the lion's tail".
- Algieba, Gamma Leonis, is a binary star with a third optical component; the primary and secondary are divisible in small telescopes and the tertiary is visible in binoculars. The primary is a gold-yellow giant star of magnitude 2.61 and the secondary is similar but at magnitude 3.6; they have a period of 600 years and are 126 light-years from Earth. The unrelated tertiary, 40 Leonis, is a yellow-tinged star of magnitude 4.8. Its traditional name, Algieba, means "the forehead".
- Delta Leonis, called Zosma, is a blue-white star of magnitude 2.58, 58 light-years from Earth.
- Epsilon Leonis is a yellow giant of magnitude 3.0, 251 light-years from Earth.
- Zeta Leonis, called Adhafera, is an optical triple star. It is a white giant star of magnitude 3.65, 260 light-years from Earth. The second-brightest, 39 Leonis, is widely spaced to the south and of magnitude 5.8. 35 Leonis is to the north and of magnitude 6.0.
- Iota Leonis is a binary star divisible in medium amateur telescopes; they are divisible in small amateur telescopes at their widest in the years 2053–2063. To the unaided eye, Iota Leonis appears to be a yellow-tinged star of magnitude 4.0. The system, 79 light-years from Earth, has components of magnitude 4.1 and 6.7 with a period of 183 years.
- Tau Leonis is a double star visible in binoculars. The primary is a yellow giant of magnitude 5.0, 621 light-years from Earth. The secondary is a star of magnitude 8.
- 54 Leonis is a binary star 289 light-years from Earth, divisible in small telescopes. The primary is a blue-white star of magnitude 4.5 and the secondary is a blue-white star of magnitude 6.3.
Leo is also home to a bright variable star, the red giant R Leonis. It is a Mira variable with a minimum magnitude of 10 and normal maximum magnitude of 6; it periodically brightens to magnitude 4.4. R Leonis, 330 light-years from Earth, has a period of 310 days and a diameter of 450 solar diameters.
The star Wolf 359 (CN Leonis), one of the nearest stars to Earth at 7.8 light-years away, is in Leo. Wolf 359 is a red dwarf of magnitude 13.5; it periodically brightens by one magnitude or less because it is a flare star. Gliese 436, a faint star in Leo about 33 light-years away from the Sun, is orbited by a transiting Neptune-mass extrasolar planet.
The star SDSS J102915+172927 (Caffau's star) is a population II star in the galactic halo seen in Leo. It is about 13 billion years old, making it one of the oldest stars in the Galaxy. It has the lowest metallicity of any known star.
Modern astronomers, including Tycho Brahe in 1602, excised a group of stars that once made up the "tuft" of the lion's tail and used them to form the new constellation Coma Berenices (Berenice's hair), although there was precedent for that designation among the ancient Greeks and Romans.
The Leo Ring, a cloud of hydrogen, helium gas, is found in the orbit of two galaxies found within this constellation.
M66 is a spiral galaxy that is part of the Leo Triplet, whose other two members are M65 and NGC 3628. It is at a distance of 37 million light-years and has a somewhat distorted shape due to gravitational interactions with the other members of the Triplet, which are pulling stars away from M66. Eventually, the outermost stars may form a dwarf galaxy orbiting M66. Both M65 and M66 are visible in large binoculars or small telescopes, but their concentrated nuclei and elongation are only visible in large amateur instruments.
M95 and M96 are both spiral galaxies 20 million light-years from Earth. Though they are visible as fuzzy objects in small telescopes, their structure is only visible in larger instruments. M95 is a barred spiral galaxy. M105 is about a degree away from the M95/M96 pair; it is an elliptical galaxy of the 9th magnitude, also about 20 million light-years from Earth. 
NGC 2903 is a barred spiral galaxy discovered by William Herschel in 1784. It is very similar in size and shape to the Milky Way and is located 25 million light-years from Earth. In its core, NGC 2903 has many "hotspots", which have been found to be near regions of star formation. The star formation in this region is thought to be due to the presence of the dusty bar, which sends shock waves through its rotation to an area with a diameter of 2,000 light-years. The outskirts of the galaxy have many young open clusters.
Leo is also home to some of the largest structures in the observable universe. Some of the structures found in the constellation are the Clowes–Campusano LQG, U1.11, U1.54, and the Huge-LQG, which are all large quasar groups; the latter being the second largest structure known (see also NQ2-NQ4 GRB overdensity).
The Leonids occur in November, peaking on November 14–15, and have a radiant close to Gamma Leonis. Its parent body is Comet Tempel-Tuttle, which causes significant outbursts every 35 years. The normal peak rate is approximately 10 meteors per hour.
History and mythology
Leo was one of the earliest recognized constellations, with archaeological evidence that the Mesopotamians had a similar constellation as early as 4000 BCE. The Persians called Leo Ser or Shir; the Turks, Artan; the Syrians, Aryo; the Jews, Arye; the Indians, Simha, all meaning "lion".
In Babylonian astronomy, the constellation was called UR.GU.LA, the "Great Lion"; the bright star Regulus was known as "the star that stands at the Lion's breast." Regulus also had distinctly regal associations, as it was known as the King Star.
In Greek mythology, Leo was identified as the Nemean Lion which was killed by Heracles (Hercules to the Romans) during the first of his twelve labours. The Nemean Lion would take women as hostages to its lair in a cave, luring warriors from nearby towns to save the damsel in distress, to their misfortune. The Lion was impervious to any weaponry; thus, the warriors' clubs, swords, and spears were rendered useless against it. Realizing that he must defeat the Lion with his bare hands, Hercules slipped into the Lion's cave and engaged it at close quarters. When the Lion pounced, Hercules caught it in midair, one hand grasping the Lion's forelegs and the other its hind legs, and bent it backwards, breaking its back and freeing the trapped maidens. Zeus commemorated this labor by placing the Lion in the sky.
The Roman poet Ovid called it Herculeus Leo and Violentus Leo. Bacchi Sidus (star of Bacchus) was another of its titles, the god Bacchus always being identified with this animal. However, Manilius called it Jovis et Junonis Sidus (Star of Jupiter and Juno).
Leo is commonly represented as if the sickle-shaped asterism of stars is the back of the Lion's head. The sickle is marked by six stars: Epsilon Leonis, Mu Leonis, Zeta Leonis, Gamma Leonis, Eta Leonis, and Alpha Leonis. The lion's tail is marked by Beta Leonis (Denebola) and the rest of his body is delineated by Delta Leonis and Theta Leonis.
As of 2002[update], the Sun appears in the constellation Leo from August 10 to September 16. In tropical astrology, the Sun is considered to be in the sign Leo from July 23 to August 22, and in sidereal astrology, from August 16 to September 17.
- Ridpath & Tirion 2001, pp. 166–168.
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- "Astronomers discover smallest "exoplanets" yet". Toronto. Archived from the original on January 16, 2009.
- L. Phil Simpson (Springer 2012) Guidebook to the Constellations: Telescopic Sights, Tales, and Myths, p. 235 (ISBN 9781441969415).
- 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.
- Prostak, Sergio (11 January 2013). "Universe's Largest Structure Discovered". scinews.com. Retrieved 15 January 2013.
- Ridpath & Tirion 2001, pp. 166–167.
- Jenniskens, Peter (September 2011). "Mapping Meteoroid Orbits: New Meteor Showers Discovered". Sky & Telescope: 24.
- Pasachoff, Jay M. (2006). Stars and Planets. Boston, Massachusetts: Houghton Mifflin. ISBN 9780395537596.
- Tamra Andrews (Oxford University Press 2000) Dictionary of Nature Myths: Legends of the Earth, Sea, and Sky (ISBN 9780195136777).
- Babylonian Star-lore by Gavin White, Solaria Publications, 2008 page 140, ISBN 978-0955903700
- Janet Parker; et al., eds. (2007). Mythology: Myths, Legends and Fantasies. Struik. pp. 121–122. ISBN 9781770074538.
- Jean Meeus, "Zodiacal Constellations", in: More Mathematical Astronomy Morsels (Richmond: Willmann-Bell Inc., 2002), pp. 327-333. Dates in other years can vary by one day due to the insertion of a leap day.
- Star Names: Their Lore and Meaning, by Richard Allen Hinckley, Dover. ISBN 0-486-21079-0
- Ridpath, Ian; Tirion, Wil (2001), Stars and Planets Guide, Princeton University Press, ISBN 0-691-08913-2
- Ian Ridpath and Wil Tirion (2007). Stars and Planets Guide, Collins, London. ISBN 978-0-00-725120-9. Princeton University Press, Princeton. ISBN 978-0-691-13556-4.
- Dictionary of Symbols, by Carl G. Liungman, W. W. Norton & Company. ISBN 0-393-31236-4
Media related to Leo (constellation) at Wikimedia Commons
- Information from Windows to the Universe
- Star Map of Leo and Information from Students for Exploration and Development of Space
- Information about Leo from Chris Dolan
- Information from StarDate Online
- Leo's skymap and information from Gary Madison
- Star Map of Leo and basic information
- Star Tales – Leo
- Myth Info from comfychair.org
- Myth Info from TheGreekGods.org
- Myth Info from ColdWater Schools
- Myth Info from Star Watch GeoCity
- Myth Info from heavens-above.com
- Warburg Institute Iconographic Database (medieval and early modern images of Leo)