Global InformationOmicron Andromedae information
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 01m 55.26499s[1] |
| Declination | +42° 19′ 33.65587″[1] |
| Apparent magnitude (V) | 3.62[2] (3.55 - 3.78[3]) |
| Characteristics | |
| Spectral type | B6III[4] (B6IIIpe + A2p)[5] |
| U−B color index | −0.53[2] |
| B−V color index | −0.09[2] |
| Variable type | γ Cas[6][3] |
| Astrometry | |
| Radial velocity (Rv) | -14.0[7] km/s |
| Proper motion (μ) | RA: +18.841 mas/yr[1] Dec.: –6.589 mas/yr[1] |
| Parallax (π) | 9.3051 ± 0.5782 mas[1] |
| Distance | 350 ± 20 ly (107 ± 7 pc)[1] |
| Absolute magnitude (MV) | −2.6[8] |
| Orbit[9] | |
| Primary | A |
| Companion | B |
| Period (P) | 118.0 yr |
| Semi-major axis (a) | 0.304″ |
| Eccentricity (e) | 0.340 |
| Inclination (i) | 107.4° |
| Orbit[10][11] | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 5.6 yr |
| Semi-major axis (a) | 0.061″ |
| Eccentricity (e) | 0.22 |
| Inclination (i) | 152.0° |
| Orbit[12][11] | |
| Primary | Ba |
| Companion | Bb |
| Period (P) | 33.01 days |
| Eccentricity (e) | 0.24 |
| Semi-amplitude (K1) (primary) | 54.8±0.8 km/s |
| Semi-amplitude (K2) (secondary) | 71.6±0.8 km/s |
| Details | |
| ο And Aa | |
| Mass | 9.85[11] M☉ |
| Radius | 6.6[8] R☉ |
| Luminosity | 1,380[13] L☉ |
| Temperature | 13,800[13] K |
| Rotational velocity (v sin i) | 240[13] km/s |
| ο And Ab | |
| Mass | 4.51[11] M☉ |
| ο And Ba | |
| Mass | 3.74[11] M☉ |
| ο And Bb | |
| Mass | 2.86[11] M☉ |
| Age | 50.1 ± 6.8[14] Myr |
| Other designations | |
FK5 869, 1 And, BD+41°4664, CDS 1436, HIP 113726, HR 8762, SAO 52609, PPM 63726[15] | |
| ο And A: HD 217675 | |
| ο And B: HD 217676 | |
| Database references | |
| SIMBAD | data |
Omicron Andromedae (ο And, ο Andromedae) is a star system in the constellation Andromeda. It is approximately 350 light years from Earth. The system as a whole is classified as a blue-white B-type giant, with a mean combined apparent magnitude of +3.62.
- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
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