Constellation in the northern celestial hemisphere
Not to be confused with the southern constellation of Sagittarius.For other uses, see Sagitta (disambiguation).
Sagitta
Constellation
List of stars in Sagitta
Abbreviation
Sge[1]
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.
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.
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.
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^"Sagitta". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 2021-04-15.
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