11 Sagittae
Star in the constellation Sagitta
From Wikipedia, the free encyclopedia
11 Sagittae is a blue giant in the constellation Sagitta with a spectral type of B9III.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagitta |
| Right ascension | 19h 57m 45.44547s[1] |
| Declination | +16° 47′ 20.9781″[1] |
| Apparent magnitude (V) | 5.53[2] |
| Characteristics | |
| Spectral type | B9III[3] |
| Astrometry | |
| Radial velocity (Rv) | −26.10±1.6[4] km/s |
| Proper motion (μ) | RA: 11.609[1] mas/yr Dec.: 18.605[1] mas/yr |
| Parallax (π) | 7.5596±0.0600 mas[1] |
| Distance | 431 ± 3 ly (132 ± 1 pc) |
| Details | |
| Mass | 2.47[2] M☉ |
| Radius | 4.02[2] R☉ |
| Luminosity | 127[2] L☉ |
| Surface gravity (log g) | 3.62[2] cgs |
| Temperature | 9,661[2] K |
| Metallicity [Fe/H] | 0.0[5] dex |
| Rotational velocity (v sin i) | 34[6] km/s |
| Age | 242[5] Myr |
| Other designations | |
| 11 Sge, BD+16°4081, HD 189090, HIP 98324, HR 7622, SAO 105471[3] | |
| Database references | |
| SIMBAD | data |
Naming
It is in the Chinese asterism 左旗 (Zuǒ Qí), or Left Flag which consists of 11 Sagittae, γ Sagittae, α Sagittae, β Sagittae, δ Sagittae, ζ Sagittae, 13 Sagittae, 14 Sagittae and ρ Aquilae. Consequently, the Chinese name for γ Sagittae itself is 左旗七 (Zuǒ Qí qī, English: the Seventh Star of Left Flag).[citation needed]