Pi Andromedae
 Location of π Andromedae (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 36m 52.84926s[1] |
| Declination | +33° 43′ 09.6384″[1] |
| Apparent magnitude (V) | 4.36[2] (4.9/5.3)[3] |
| Characteristics | |
| Spectral type | B5 V[4] (B5 V + B5 V[3]) |
| U−B color index | –0.55[2] |
| B−V color index | –0.16[2] |
| Astrometry | |
| Radial velocity (Rv) | +8.7[5] km/s |
| Proper motion (μ) | RA: +14.75[1] mas/yr Dec.: –3.51[1] mas/yr |
| Parallax (π) | 5.45 ± 0.31[1] mas |
| Distance | 600 ± 30 ly (180 ± 10 pc) |
| Details | |
| Surface gravity (log g) | 4.10[4] cgs |
| Temperature | 15,276[4] K |
| Metallicity [Fe/H] | –0.20[4] dex |
| Rotational velocity (v sin i) | 25[6] km/s |
| Other designations | |
Pi Andromedae (Pi And, π Andromedae, π And) is the Bayer designation for a binary star[3] system in the northern constellation of Andromeda. With an apparent visual magnitude of 4.4,[2] it is visible to the naked eye. It is located approximately 600 light-years (180 parsecs) from Earth.
The pair is classified as a blue-white B-type main sequence dwarf with an apparent magnitude of +4.34. It is a spectroscopic binary with an orbital period of 143.6 days and an eccentricity of 0.56. There is a magnitude 8.6 companion 35.9 arcseconds away.[3] At 55 arcseconds separation is an 11th magnitude companion.
Naming
In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism consisting of π Andromedae, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, ν Andromedae, μ Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, υ Piscium, φ Piscium, χ Piscium and ψ¹ Piscium. Consequently, π Andromedae itself is known as 奎宿六 (Kuí Sù liù, English: the Sixth Star of Legs.)[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 4.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 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 5 月 19 日
External links
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