Theta Sagittae

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Theta Sagittae
Diagram showing star positions and boundaries of the Sagitta constellation and its surroundings
Cercle rouge 100%.svg

Location of θ Sagittae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagitta
Right ascension 20h 09m 56.61s
Declination +20° 54' 53.2"
Apparent magnitude (V) +6.51
Distance 147 ly
(45 pc)
Spectral type F5IV
Other designations
θ Sagittae, θ Sge, Theta Sge, 17 Sagittae, BD+20 4453, CCDM J20099+2054A, GC 27987, HD 191570, HIP 99352, HR 7705, PPM 110544, SAO 88276, WDS J20099+2055A

Theta Sagittae (Theta Sge, θ Sagittae, θ Sge) is a multiple star system in the constellation of Sagitta, with an apparent magnitude of +6.51. The primary component is a yellowish white F-type subgiant. It is approximately 147 light years from Earth. The star's age is estimated to be 1.9 billion years but is certainly no less than 1.5 billion years and no greater than 2.2 billion years.[1]

Theta Sagittae is moving through the Galaxy at a speed of 49.5 km/s relative to the Sun. Its projected Galactic orbit carries it between 18,500 and 25,900 light years from the center of the Galaxy.[1]

Theta Sagittae will come closest to the Sun 777,000 years from now when it will brighten to magnitude 4.97 from a distance of 72 light years.[1]

References[edit]