Indus (constellation)

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Indus
Constellation
Indus
Abbreviation Ind
Genitive Indi
Pronunciation /ˈɪndəs/,
genitive /ˈɪnd/
Symbolism the Indian
Right ascension 21
Declination −55
Family Bayer
Quadrant SQ4
Area 294 sq. deg. (49th)
Main stars 3
Bayer/Flamsteed
stars
16
Stars with planets 3
Stars brighter than 3.00m 0
Stars within 10.00 pc (32.62 ly) 1
Brightest star The Persian (α Ind) (3.11m)
Nearest star Epsilon Indi
(11.83 ly, 3.62 pc)
Messier objects none
Meteor showers none[1]
Bordering
constellations
Microscopium
Sagittarius (corner)
Telescopium
Pavo
Octans
Tucana
Grus
Visible at latitudes between +15° and −90°.
Best visible at 21:00 (9 p.m.) during the month of September.

Indus is a constellation in the southern sky. Created in the late sixteenth century, it represents an Indian, a word that could refer at the time to any native of Asia or the Americas.

Notable features[edit]

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

Indus does not contain any bright stars. Alpha Indi is the brightest star in Indus. It is an orange giant of magnitude 3.1, 101 light-years from Earth. Beta Indi is an orange giant of magnitude 3.7, 600 light-years from Earth. Delta Indi is a white star of magnitude 4.4, 185 light-years from Earth.

Epsilon Indi is one of the closest stars to Earth, approximately 11.8 light years away. It is an orange dwarf of magnitude 4.7, meaning that the yellow dwarf Sun is slightly hotter and larger.[2] The system has been discovered to contain a pair of binary brown dwarfs, and has long been a prime candidate in SETI studies.[3][4]

Indus is home to one bright binary star. Theta Indi is a binary star divisible in small amateur telescopes, 97 light-years from Earth. Its primary is a white star of magnitude 4.5 and its secondary is a white star of magnitude 7.0.[2]

T Indi is the only bright variable star in Indus. It is a semi-regular, deeply coloured red giant with a period of 11 months, 1900 light-years from Earth. Its minimum magnitude is 7 and its maximum magnitude is 5.[2]

History[edit]

The constellation was one of twelve created by Petrus Plancius from the observations of Pieter Dirkszoon Keyser and Frederick de Houtman[2] and it first appeared on a 35-cm diameter celestial globe published in 1597 (or 1598) in Amsterdam by Plancius with Jodocus Hondius. The first depiction of this constellation in a celestial atlas was in Johann Bayer's Uranometria of 1603.[5][6] Plancius portrayed the figure as a nude male with arrows in both hands but no bow.[7]

References[edit]

  1. ^ Anonymous (February 3, 2007). "Meteor Showers". American Meteor Society. Retrieved 2008-05-07. 
  2. ^ a b c d Ridpath & Tirion 2001, pp. 162-163.
  3. ^ Burnham, Robert; Luft, Herbert A. (1978). Burnham's Celestial Handbook: An Observer's Guide to the Universe Beyond the Solar System. Courier Dover Publications. ISBN 0-486-23568-8. 
  4. ^ Lawton, A. T. (1975). "CETI from Copernicus". Spaceflight 17: 328–330. Bibcode:1975SpFl...17..328L. 
  5. ^ Bakich, Michael E. (1995). The Cambridge Guide to the Constellations. Cambridge University Press. ISBN 0-521-44921-9. 
  6. ^ Sawyer Hogg, Helen (1951). "Out of Old Books (Pieter Dircksz Keijser, Delineator of the Southern Constellations)". Journal of the Royal Astronomical Society of Canada 45: 215. Bibcode:1951JRASC..45..215S. 
  7. ^ Allen, Richard Hinckley (1963). Star Names, Their Lore and Meaning. New York: Dover Publications. ISBN 0-486-21079-0. 

External links[edit]

Media related to Indus (constellation) at Wikimedia Commons

Coordinates: Sky map 21h 00m 00s, −55° 00′ 00″