| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h36m 52.85132s[1] |
| Declination | +33° 43′ 09.6363″[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: 14.669(118)[1] mas/yr Dec.: −3.385(93)[1] mas/yr |
| Parallax (π) | 5.6563 ± 0.1474 mas[1] |
| Distance | 580 ± 20 ly (177 ± 5 pc) |
| Orbit[3] | |
| Period (P) | 143.6 days |
| Eccentricity (e) | 0.56 |
| Details | |
| Luminosity | 1,136[6] L☉ |
| 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[7] km/s |
| Other designations | |
π Andromedae, 29 Andromedae, ADS 513, BD+32°101, FK5 18, HD 3369, HIP 2912, HR 154, SAO 54033, PPM 65480 | |
| Database references | |
| SIMBAD | data |
Pi Andromedae (Pi And, π Andromedae, π And) is the Bayer designation for a binary star[3] system in the northern constellationofAndromeda. With an apparent visual magnitude of 4.4,[2] it is visible to the naked eye. It is located approximately 580 light-years (180 parsecs) from Earth.[1]
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. [3]
The spectroscopic binary forms a triple system with BD+32 102, a magnitude 8.6 star located 35.9 arcseconds away.[3] At 55 arcseconds separation is an 11th magnitude companion that is just located on the same line of sight, but at a very different distance from us.
InChinese, 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, the Chinese name for π Andromedae itself is 奎宿六 (Kuí Sù liù, English: the Sixth Star of Legs.)[8]
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