Observation data Epoch J2000.0 Equinox J2000.0 |
|
---|---|
Constellation | Andromeda |
Right ascension | 01h 39m 21.0s |
Declination | +44° 23′ 10″ |
Apparent magnitude (V) | +5.1627 |
Characteristics | |
Spectral type | G8 III |
U−B color index | +0.55 |
B−V color index | +0.883 |
Astrometry | |
Radial velocity (Rv) | +6.54 km/s |
Proper motion (μ) |
RA: –19.78 mas/yr Dec.: +15.40 mas/yr |
Parallax (π) | 13.03 ± 0.55mas |
Distance | 250 ± 10 ly (77 ± 3 pc) |
Orbit | |
Period (P) | 21.5 ± 0.1 yr |
Eccentricity (e) | 0.368 ± 0.020 |
Periastron epoch (T) | 43,216 ± 60 MJD |
Argument of periastron (ω) (secondary) |
144 ± 3° |
Semi-amplitude (K1) (primary) |
3.01 ± 0.09 km/s |
Details | |
Radius | 9 R☉ |
Luminosity | 47 L☉ |
Surface gravity (log g) | 2.9 cgs |
Temperature | 5,070 K |
Metallicity [Fe/H] | –0.21 dex |
Rotational velocity (v sin i) | 0.0 km/s |
Other designations | |
Database references | |
SIMBAD | data |
Chi Andromedae (χ Andromedae, χ And) is the Bayer designation for a star in the northern constellation of Andromeda. It has an apparent visual magnitude of +5.2, which is relatively faint for a naked-eye star. Based upon parallax measurements made during the Hipparcos mission, Chi Andromedae is located around 250 light-years (77 parsecs) from Earth.
It with φ And composed the Chinese asterism 軍南門 (Keun Nan Mun, Mandarin jūnnánmén), "the South Gate of the Camp". χ Andromedae is a member of 天大將軍 (Tiān Dà Jiāng Jūn), meaning Heaven's Great General, together with γ Andromedae, φ Persei, 51 Andromedae, 49 Andromedae, θ Andromedae, τ Andromedae, 56 Andromedae, β Trianguli, γ Trianguli and δ Trianguli. Consequently, χ Andromedae itself is known as 天大將軍五 (Tiān Dà Jiāng Jūn wǔ, English: the Fifth Star of Heaven's Great General.)