Phi Andromedae

Phi Andromedae
Location of φ Andromedae (upper left).
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 01h 09m 30.12562s[1]
Declination +47° 14′ 30.4594″[1]
Apparent magnitude (V) 4.25[2] (4.46/6.06)[3]
Characteristics
Spectral type B7 Ve[4] + B9 V[3]
U−B color index –0.34[2]
B−V color index –0.07[2]
R−I color index –0.05
Astrometry
Radial velocity (Rv)–0.1[5] km/s
Proper motion (μ) RA: +4.05[1] mas/yr
Dec.: –12.43[1] mas/yr
Parallax (π)4.55 ± 0.60 mas[1]
Distanceapprox. 720 ly
(approx. 220 pc)
Absolute magnitude (MV)−2.41[6]
Orbit[7]
Companionφ And B
Period (P)554.3 ± 67.1y yr
Semi-major axis (a)0.573 ± 0.051″
Eccentricity (e)0.385 ± 0.043
Inclination (i)142.2 ± 2.8°
Longitude of the node (Ω)337.2 ± 3.2°
Periastron epoch (T)17,740 ± 1,837 HMJD
Argument of periastron (ω)
(secondary)		112.6 ± 9.1°
Details
φ And A
Luminosity882[6] L☉
Surface gravity (log g)3.150[8] cgs
Temperature13490[8] K
Rotational velocity (v sin i)75[9] km/s
Age63.1 ± 13.7[10] Myr
Other designations
42 Andromedae, ADS 940, BD+46 275, HD 6811, HIP 5434, HR 335, SAO 36972, PPM 43693[11]
Database references
SIMBADdata
φ Andromedae in optical light

Phi Andromedae (φ Andromedae, φ And) is the Bayer designation for a binary star[3] system near the border of the northern constellation of Andromeda. This system has a combined apparent visual magnitude of 4.25[2] and is visible to the naked eye. Based upon parallax measurements made during the Hipparcos mission, this star system is located at a distance of about 720 light-years (220 parsecs) from Earth.[1] With χ And it forms the Chinese asterism 軍南門 (Keun Nan Mun, Mandarin jūnnánmén), "the South Gate of the Camp".[12][13]

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  13. ^ In Chinese literature, φ Andromedae is stand alone in the asterism and χ Andromeda is member of Tien Ta Tseang (Heaven's Great General) asterism, see (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 9 日 and (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日