Gamma Sagittae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Sagitta |
| Right ascension | 19h 58m 45.42863s [1] |
| Declination | +19° 29′ 31.7281″ [1] |
| Apparent magnitude (V) | +3.47 |
| Characteristics | |
| Spectral type | M0III |
| Astrometry | |
| Radial velocity (Rv) | -34.00 ± 0.2[1] km/s |
| Proper motion (μ) | RA: 66.21 ± 0.14[2] mas/yr Dec.: 22.22 ± 0.12[2] mas/yr |
| Parallax (π) | 12.62 ± 0.18[2] mas |
| Distance | 258 ± 4 ly (79 ± 1 pc) |
| Absolute magnitude (MV) | -2.13[3] |
| Details | |
| Radius | 55[3] R☉ |
| Luminosity | 562±75[3] L☉ |
| Temperature | 3805[3] K |
| Metallicity | -0.14[3] |
| Other designations | |
Gamma Sagittae (Gamma Sge, γ Sagittae, γ Sge) is the brightest star in constellation Sagitta and is a red giant with an apparent magnitude of +3.47. It is approximately 258 ± 4 light years from Earth. It has been classified as anywhere from spectral type K5III to M0III.[4]
It radiates at a power 640 times that of Sun. With a mass of 2.5 times that of the Sun, Gamma Sagittae began life 750 million years ago as a white class B9 star.[4]
Naming
In Chinese, 左旗 (Zuǒ Qí), meaning Left Flag, refers to an asterism consisting of γ Sagittae, α Sagittae, β Sagittae, δ Sagittae, ζ Sagittae, 13 Sagittae, 11 Sagittae, 14 Sagittae and ρ Aquilae. Consequently, γ Sagittae itself is known as 左旗五 (Zuǒ Qí wǔ, English: the Fifth Star of Left Flag.)[5]
References
- ↑ 1.0 1.1 1.2 SIMBAD, Gamma Sagittae (accessed 22 May 2015)
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日
<templatestyles src="Asbox/styles.css"></templatestyles>
 |
This giant-star-related article is a stub. You can help Wikipedia by expanding it. |
