Theta Sagittarii

Starbox short
name=θ¹ Sagittarii
epoch=J2000.0
constell=Sagittarius
ra=19^h 59^m 44.2^s
dec=-35° 16' 35"
spectral=B2.5IV
appmag_v=+4.37
dist_ly=618 ± 105
dist_pc=189 ± 32
names=HR 7623, HD 189103,
SAO 211716, HIP 98412The Bayer designation Theta Sagittarii (θ Sgr / θ Sagittarii) is shared by two star systems, θ¹ Sagittarii and θ² Sagittarii, in the constellation Sagittarius. The two stars are separated by 0.58° on the sky.

θ¹ Sagittarii

Theta-1 Sagittarii is a spectroscopic binary lying 617 light years from Earth. The primary star, θ¹ Sagittarii A, is a spectral type B2.5 subgiant which has an apparent magnitude of +4.37. The companion star, θ¹ Sagittarii B, is approximately 0.2 arcseconds from the primary, which puts them 31 Astronomical Units (AU) apart (a Sun-Neptune distance).

θ² Sagittarii

Starbox short
name=θ² Sagittarii
epoch=J2000.0
constell=Sagittarius
ra=19^h 59^m 51.3^s
dec=-34° 41' 52"
spectral=A4/A5IV
appmag_v=+5.30
dist_ly=157 ± 7
dist_pc=48 ± 2
names=HR 7624, HD 189118,
SAO 211717, HIP 98421,
CCDM 19599-3442

Theta-2 Sagittarii is a triple star system 157 light years from Earth. θ² Sagittarii A is a spectral type A4/5 subgiant which has an apparent magnitude of +5.30. Orbiting the primary with a separation on the sky of 30 arcseconds, or at least 1400 AU, is binary star comprised of θ² Sagittarii B, a magnitude +10.8 star, and θ² Sagittarii C, with a magnitude of +11.5. B and C are 1.2 arcseconds, or approximately 58 AU apart.