- Chinese name
- General Tian No.1
- Foreign name
- Alamch，γ And
- Alias
- Andromeda gamma
- Classification
- fixed star
- surface temperature
- 4500 K [1]
- Apparent magnitude
- 2.26 etc
- Absolute magnitude
- -2.9 etc
- Distance from ground
- About 350 light years
- Radius
- 80 R☉
- Luminosity
- 2,000L☉
observation data
Andromeda gamma is a double star system, consisting of an orange giant and a blue star. It is the 73rd bright star in the sky, the third bright star in Andromeda.
General Tianda Junyi looks like a star to the naked eye, but it is actually a multi star system. Its main components are γ 1 and γ 2, or Tianda General-A and Tianda General-BC. The γ 2 system itself is a multi star system, consisting of a spectral binary system B and a companion star C, whose operating cycle is 4748 years. [1]
constellation | andromeda |
Star official | |
Right ascension | 02 03 53.9531 |
Declination | +42° 19′ 47.009″ |
Apparent magnitude (V) | two point two six |
Spectral classification | K3IIb |
B-V color index | +1.37 |
U-B color index | +1.58 |
Variant type | variable |
Radial speed (Rv) | −11.7 ± 0.9 km/s |
Self acting (μ) | Right ascension (RA): 43.08 mas/year Declination: − 50.85 mas/year |
Parallax (π) | 9.19 ± 0.73 mas |
| 350 ± 30 light years (109 ± 9 seconds difference) |
Absolute magnitude (MV) | −2.9 |
radius | 80 R☉ |
brightness | 2,000L☉ |
temperature | 4,500 K |
General Tian No.1
