  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 39m 20.98857s[1] |
| Declination | +44° 23′ 10.2299″[1] |
| Apparent magnitude (V) | +5.01[2] |
| Characteristics | |
| Spectral type | G8 III[2] |
| U−Bcolor index | +0.55[3] |
| B−Vcolor index | +0.883[4] |
| Astrometry | |
| Radial velocity (Rv) | +6.54[5] km/s |
| Proper motion (μ) | RA: −13.395(126)[1]mas/yr Dec.: 8.635(85)[1]mas/yr |
| Parallax (π) | 12.3592±0.1046 mas[1] |
| Distance | 264 ± 2 ly (80.9 ± 0.7 pc) |
| Absolute magnitude (MV) | +0.59[2] |
| Orbit[6] | |
| Period (P) | 20.8 ± 0.1 yr |
| Eccentricity (e) | 0.368 ± 0.020 |
| Periastronepoch (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[5] R☉ |
| Luminosity | 47[5] L☉ |
| Surface gravity (log g) | 2.9[5] cgs |
| Temperature | 5,070[5] K |
| Metallicity[Fe/H] | –0.21[5] dex |
| Rotational velocity (v sin i) | 0.0[5] km/s |
| Other designations | |
| 52 Andromedae,BD+43°343,FK5 2112,HD 10072,HIP 7719,HR 469,SAO 37406,PPM 44275[7] | |
| Database references | |
| SIMBAD | data |
Chi Andromedae (χ Andromedae,χ And) is theBayer designation for astar in the northernconstellation ofAndromeda. It has anapparent visual magnitude of +5.01,[2] which isrelatively faint for a naked-eye star. Based uponparallax measurements made during theGaia mission, Chi Andromedae is located around 264light-years (81parsecs) from Earth.[1]
χ Andromedae is a member of天大將軍 (Tiān Dà Jiāng Jūn), meaningHeaven's Great General, together withγ Andromedae,φ Persei,51 Andromedae,49 Andromedae,θ Andromedae,τ Andromedae,56 Andromedae,β Trianguli,γ Trianguli andδ Trianguli. Consequently, theChinese name for χ Andromedae itself is天大將軍五 (Tiān Dà Jiāng Jūn wǔ, English:the Fifth Star of Heaven's Great General.)[8]
This is most likely aspectroscopic binary system with an estimatedorbital period of 20.8 years and aneccentricity of 0.37. The primary component has astellar classification of G8 III,[6] which indicates it is agiant star that has exhausted the supply of hydrogen at its core andevolved away from themain sequence. Theouter envelope has expanded to about nine times the radius of the Sun and it is radiating 47[5] times the luminosity of the Sun at aneffective temperature of 5,070 K.[5] This heat gives the star the yellow-hued glow of aG-type star.[9] It appears to be rotating very slowly with no measurableprojected rotational velocity.[5] The secondary component seems to be a main-sequence star of the spectral class G or K.[6]
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