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Pegasus
Pegasus
List of stars in Pegasus
Abbreviation Peg
Genitive Pegasi
Pronunciation /ˈpɛɡəsəs/, genitive /ˈpɛɡəsaɪ/
Symbolism the Winged Horse / Pegasus
Right ascension 23 h
Declination +20°
Family Perseus
Quadrant NQ4
Area 1121 sq. deg. (7th)
Main stars 9, 17
Bayer/Flamsteed
stars
88
Stars with planets 8
Stars brighter than 3.00m 5
Stars within 10.00 pc (32.62 ly) 3
Brightest star ε Peg (Enif) (2.38m)
Nearest star EQ Peg
(20.38 ly, 6.25 pc)
Messier objects 1
Meteor showers July Pegasids
Bordering
constellations
Andromeda
Lacerta
Cygnus
Vulpecula
Delphinus
Equuleus
Aquarius
Pisces
Visible at latitudes between +90° and −60°.
Best visible at 21:00 (9 p.m.) during the month of October.

Pegasus is a constellation in the northern sky, named after the winged horse Pegasus in Greek mythology. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations.

Contents

Notable features

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Stars

α Peg (Markab), β Peg, and γ Peg, together with α Andromedae (Alpheratz or Sirrah) form the large asterism known as the Square of Pegasus. 51 Pegasi, a star in this constellation, is the first Sun-like star known to have an extrasolar planet. IK Pegasi is the nearest supernova candidate. Spectroscopic analysis of HD 209458 b, an extrasolar planet in this constellation has provided the first evidence of atmospheric water vapor beyond the solar system, while extrasolar planets orbiting the star HR 8799 also in Pegasus are the first to be directly imaged.

Named Stars

Bayer designation Name Origin Meaning
           α Markab Arabic the saddle of the horse
           β Scheat Arabic the leg
           γ Algenib Arabic the flank
           ε Enif Arabic nose
           ζ Homam Arabic man of high spirit
           η Matar Arabic lucky star of rain
           θ Baham Arabic the livestocks
           μ Sadalbari Arabic luck star of the splendid one

Deep sky objects

Visualizations

Pegasus with the foal Equuleus next to it, as depicted in Urania's Mirror, a set of constellation cards published in London c.1825. The horses appear upside-down in relation to the constellations around them.
Diagram of H.A. Rey's alternative way to connect the stars in the constellation Pegasus, showing it as a winged horse.

Pegasus is dominated by an asterism in the shape of a rough square, although one of the stars, Delta Pegasi or Sirrah, is now officially considered to be part of Andromeda, (α Andromedae) and is more usually called "Alpheratz."

H.A. Rey has suggested an alternative way to connect the stars into the shape of a winged horse. The body of the horse consists of a quadrilateral formed by the stars α Peg, β Peg, γ Peg, and α And. The front legs of the winged horse are formed by two crooked lines of stars, one leading from η Peg to κ Peg and the other from μ Peg to 1 Pegasi. Another crooked line of stars from α Peg via θ Peg to ε Peg forms the neck and head; ε is the snout.

References

  • H. A. Rey, The Stars — A New Way To See Them. Enlarged World-Wide Edition. Houghton Mifflin, Boston, 1997. ISBN 0-395-24830-2.
  • Ian Ridpath and Wil Tirion (2007). Stars and Planets Guide, Collins, London ISBN 978-0007251209. Princeton University Press, Princeton. ISBN 978-0691135564.

External links




Coordinates: Sky map 23h 00m 00s, +20° 00′ 00″


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