Omicron Andromedae

"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
Location of ο Andromedae (far right)
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]
Distanceapprox. 690 ly
(approx. 210 pc)
Absolute magnitude (MV)−2.6[8]
Orbit[9]
PrimaryA
CompanionB
Period (P)118.0 yr
Semi-major axis (a)0.304″
Eccentricity (e)0.340
Inclination (i)107.4°
Orbit[10][11]
PrimaryAa
CompanionAb
Period (P)5.6 yr
Semi-major axis (a)0.061″
Eccentricity (e)0.22
Inclination (i)152.0°
Orbit[12][11]
PrimaryBa
CompanionBb
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
Mass9.85[11] M☉
Radius6.6[8] R☉
Luminosity1,380[13] L☉
Temperature13,800[13] K
Rotational velocity (v sin i)240[13] km/s
ο And Ab
Mass4.51[11] M☉
ο And Ba
Mass3.74[11] M☉
ο And Bb
Mass2.86[11] M☉
Age50.1 ± 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
SIMBADdata

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.

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