Chi Andromedae
 Location of χ Andromedae (circled) |
|
| 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.)
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