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Sagitta
Constellation in the northern celestial hemisphere / From Wikipedia, the free encyclopedia
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Sagitta is a dim but distinctive constellation in the northern sky. Its name is Latin for 'arrow', not to be confused with the significantly larger constellation Sagittarius 'the archer'. It was included among the 48 constellations listed by the 2nd-century astronomer Ptolemy, and it remains one of the 88 modern constellations defined by the International Astronomical Union. Although it dates to antiquity, Sagitta has no star brighter than 3rd magnitude and has the third-smallest area of any constellation.
Constellation | |
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Abbreviation | Sge[1] |
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Genitive | Sagittae[1] |
Pronunciation | /səˈdʒɪtə/ or /səˈɡɪtə/ Sagítta,[2] genitive /səˈdʒɪtiː/ |
Symbolism | the Arrow[3] |
Right ascension | 18h 57m 21.3919s – 20h 20m 44.8677s[4] |
Declination | 16.0790844° to 21.6436558°[4] |
Area | 79.9[5] sq. deg. (86th) |
Main stars | 4 |
Bayer/Flamsteed stars | 19 |
Stars with planets | 2 |
Stars brighter than 3.00m | 0 |
Stars within 10.00 pc (32.62 ly) | 2 (GJ 745A/B) |
Brightest star | γ Sge (3.51m) |
Messier objects | 1 |
Bordering constellations | Vulpecula Hercules Aquila Delphinus |
Visible at latitudes between +90° and −70°. Best visible at 21:00 (9 p.m.) during the month of August. |
Gamma Sagittae is the constellation's brightest star, with an apparent magnitude of 3.47. It is an aging red giant star 90% as massive as the Sun that has cooled and expanded to a radius 54 times greater than it. Delta, Epsilon, Zeta, and Theta Sagittae are each multiple stars whose components can be seen in small telescopes. V Sagittae is a cataclysmic variable—a binary star system composed of a white dwarf accreting mass of a donor star that is expected to go nova and briefly become the most luminous star in the Milky Way and one of the brightest stars in our sky around the year 2083. Two star systems in Sagitta are known to have Jupiter-like planets, while a third—15 Sagittae—has a brown dwarf companion.