Short description: Binary star system in the constellation Andromeda
Pi Andromedae
Location of π Andromedae (circled) |
Observation data
Equinox J2000.0]] (ICRS)
|
| Constellation
|
Andromeda
|
| Right ascension
|
00h 36m 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[1] mas |
| 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 |
π Andromedae in optical light
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 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.
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, the Chinese name for π Andromedae itself is 奎宿六 (Kuí Sù liù, English: the Sixth Star of Legs.)[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ 4.0 4.1 4.2 4.3 Cenarro, A. J. et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society 374 (2): 664–690, doi:10.1111/j.1365-2966.2006.11196.x, Bibcode: 2007MNRAS.374..664C.
- ↑ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Washington: Carnegie Institution of Washington), Bibcode: 1953GCRV..C......0W.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal 573 (1): 359–365, doi:10.1086/340590, Bibcode: 2002ApJ...573..359A.
- ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日
External links
 | Original source: https://en.wikipedia.org/wiki/Pi Andromedae. Read more |
