Zeta Sagittae

Zeta Sagittae

Location of ζ Sagittae (circled)

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Sagitta
Right ascension	19^h 48^m 58.65^s
Declination	+19° 08' 31.1"
Apparent magnitude (V)	+5.01
Distance	326 ly (100 pc)
Spectral type	A3V
Other designations
ζ Sagittae, ζ Sge, Zeta  Sge, 8 Sagittae, BD+19 4229, GC 27431, HD 187362, HIP 97496, HR 7546, IDS 19445+1853, PPM 137034, SAO 105298, WDS J19490+1909AB

Zeta Sagittae (Zeta Sge, ζ Sagittae, ζ Sge) is triple star system in constellation of Sagitta, with an apparent magnitude of +5.01. The primary component is a white A-type main-sequence star. It is approximately 326 light years from Earth.

Zeta Sagittae is moving through the Galaxy at a speed of 20.5 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,800 and 27,500 light years from the center of the Galaxy. It will come closest to the Sun 3.0 million years from now when it will brighten to magnitude 3.85 from a distance of 149 light years.^[1]

Naming

In Chinese, 左旗 (Zuǒ Qí), meaning Left Flag, refers to an asterism consisting of ζ Sagittae, α Sagittae, β Sagittae, δ Sagittae, γ Sagittae, 13 Sagittae, 11 Sagittae, 14 Sagittae and ρ Aquilae. Consequently, ζ Sagittae itself is known as 左旗四 (Zuǒ Qí sì, English: the Fourth Star of Left Flag.)^[2]

References

1. Zeta Sagittae (HIP 97496)
2. (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日