Omicron Andromedae
Variable star in the constellation of Andromeda / From Wikipedia, the free encyclopedia
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"1 Andromedae" and "1 And" redirect here. For the galaxy, see Andromeda I. For ι Andromedae, see Iota Andromedae. For other uses, see And 1.
Omicron Andromedae (ο And, ο Andromedae) is a star system in the constellation Andromeda. It is approximately 692 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.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 23h 01m 55.265s[1] |
Declination | +42° 19′ 33.53″[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: +22.99[1] mas/yr Dec.: +0.88[1] mas/yr |
Parallax (π) | 4.75 ± 0.53 mas[1] |
Distance | approx. 690 ly (approx. 210 pc) |
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 | |
ο And A: HD 217675 | |
ο And B: HD 217676 | |
Database references | |
SIMBAD | data |
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