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] |
Distance | approx. 720 ly (approx. 220 pc) |
Absolute magnitude (MV) | −2.41[6] |
Orbit[7] | |
Companion | φ 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 | |
Luminosity | 882[6] L☉ |
Surface gravity (log g) | 3.150[8] cgs |
Temperature | 13490[8] K |
Rotational velocity (v sin i) | 75[9] km/s |
Age | 63.1 ± 13.7[10] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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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