Omicron Persei (ο Persei, abbreviated Omicron Per, ο Per) is a triple star system in the constellation of Perseus. From parallax measurements taken during the Hipparcos mission it is approximately 1,100 light-years (330 parsecs) from the Sun.
Quick Facts Observation data Epoch J2000 Equinox J2000, Apparent magnitude (V) ...
ο Persei
Location of ο Persei (circled red) |
Observation data Epoch J2000 Equinox J2000 |
Constellation |
Perseus |
A |
Right ascension |
03h 44m 19.13377s[1] |
Declination |
32° 17′ 17.6874″[1] |
Apparent magnitude (V) |
3.83[2] |
B |
Right ascension |
03h 44m 19.17122s[3] |
Declination |
32° 17′ 18.5103″[3] |
Apparent magnitude (V) |
6.68[4] |
Characteristics |
A |
Spectral type |
B1III / B2V[5] |
U−B color index |
-0.75[2] |
B−V color index |
+0.05[2] |
Variable type |
ellipsoidal[6] |
Astrometry |
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|
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Radial velocity (Rv) | +12.20[7] km/s |
Absolute magnitude (MV) | −4.4[5] |
A |
---|
Proper motion (μ) | RA: +6.091[1] mas/yr Dec.: −9.732[1] mas/yr |
Parallax (π) | 3.0224 ± 0.3827 mas[1] |
Distance | approx. 1,100 ly (approx. 330 pc) |
Orbit[5] |
---|
Primary | Aa |
Companion | Ab |
Period (P) | 4.4191447 days |
Semi-major axis (a) | 33 R☉ |
Eccentricity (e) | 0.0 |
Inclination (i) | 39±15° |
Semi-amplitude (K1) (primary) | 111.8 km/s |
Semi-amplitude (K2) (secondary) | 155.0 km/s |
Details |
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Aa |
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Mass | 14[8] M☉ |
Radius | 9.6[5] R☉ |
Surface gravity (log g) | 3.4[8] cgs |
Temperature | 22,700[8] K |
Rotational velocity (v sin i) | 70±5[5] km/s |
Ab |
---|
Mass | 10[8] M☉ |
Radius | 8.9[5] R☉ |
Surface gravity (log g) | 4.0[8] cgs |
Temperature | 21,000[8] K |
Rotational velocity (v sin i) | 65±15[5] km/s |
Age | 15[5] Myr |
Other designations |
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Atik, 38 Persei, ADS 2726 AB, BD+31°642, CCDM J03443+3217AB, GC 4461, GSC 02359-01258, HIP 17448, HR 1131, HD 23180, SAO 56673, WDS J03443+3217AB |
Database references |
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SIMBAD | data |
Close
The system consists of a spectroscopic binary pair designated Omicron Persei A and a third companion Omicron Persei B.[9] A's two components are themselves designated Omicron Persei Aa (officially named Atik , the traditional name of the system)[10][11] and Ab.