GR Andromedae
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Right ascension00h 28m 28.5694s[2]
Declination+32° 26′ 15.876″[2]
Apparentmagnitude(V)6.87 – 6.95 variable[3]
 The visual band light curve of GR Andromedae, showing variation about the mean brightness. Adapted from Pyper et al. (2017)[1] | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 28m 28.5694s[2] |
| Declination | +32° 26′ 15.876″[2] |
| Apparent magnitude (V) | 6.87 – 6.95 variable[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A2pSrCrEu[3] |
| Apparent magnitude (B) | 6.99[4] |
| Apparent magnitude (V) | 6.91[4] |
| Apparent magnitude (G) | 6.8449[2] |
| Apparent magnitude (J) | 6.708[5] |
| Apparent magnitude (H) | 6.765[5] |
| Apparent magnitude (K) | 6.739[5] |
| Variable type | α2 CVn[3] |
| Astrometry | |
| Radial velocity (Rv) | −18.2±0.7[6] km/s |
| Proper motion (μ) | RA: −28.947±0.032 [2] mas/yr Dec.: −20.114±0.026[2] mas/yr |
| Parallax (π) | 5.7439±0.0306 mas[2] |
| Distance | 568 ± 3 ly (174.1 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.88[7] |
| Details | |
| Mass | 2.24[7] M☉ |
| Radius | 2.24[8] R☉ |
| Luminosity | 37[7] L☉ |
| Surface gravity (log g) | 3[9] cgs |
| Temperature | 8,542[9] K |
| Metallicity [Fe/H] | 1[9] dex |
| Rotation | 518.2 days[1] |
| Rotational velocity (v sin i) | < 6[8] km/s |
| Age | 525[7] Myr |
| Other designations | |
| 2MASS J00282858+3226159, BD+31 59, HD 2453, HIP 2243, SAO 53921, TYC 2266-725-1 | |
| Database references | |
| SIMBAD | data |
GR Andromedae (often abbreviated to GR And) is a variable star in the constellation Andromeda. Its apparent visual magnitude varies between 6.87 and 6.95 in a cycle of 518.2 days.[1] It is classified as an α2 Canum Venaticorum variable.[3]
