Omicron Persei
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.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| A | |
| Right ascension | 03h 44m 19.13377s |
| Declination | 32° 17′ 17.6874″ |
| Apparent magnitude (V) | 3.83 |
| B | |
| Right ascension | 03h 44m 19.17122s |
| Declination | 32° 17′ 18.5103″ |
| Apparent magnitude (V) | 6.68 |
| Characteristics | |
| A | |
| Spectral type | B1III / B2V |
| U−B color index | -0.75 |
| B−V color index | +0.05 |
| Variable type | ellipsoidal |
| Astrometry | |
| Radial velocity (Rv) | +12.20 km/s |
| Absolute magnitude (MV) | −4.4 |
| A | |
| Proper motion (μ) | RA: +6.091 mas/yr Dec.: −9.732 mas/yr |
| Parallax (π) | 3.0224 ± 0.3827 mas |
| Distance | approx. 1,100 ly (approx. 330 pc) |
| Orbit | |
| 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 | |
| Aa | |
| Mass | 14 M☉ |
| Radius | 9.6 R☉ |
| Surface gravity (log g) | 3.4 cgs |
| Temperature | 22,700 K |
| Rotational velocity (v sin i) | 70±5 km/s |
| Ab | |
| Mass | 10 M☉ |
| Radius | 8.9 R☉ |
| Surface gravity (log g) | 4.0 cgs |
| Temperature | 21,000 K |
| Rotational velocity (v sin i) | 65±15 km/s |
| Age | 15 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The system consists of a spectroscopic binary pair designated Omicron Persei A and a third companion Omicron Persei B. A's two components are themselves designated Omicron Persei Aa (officially named Atik /ˈeɪtɪk/, the traditional name of the system) and Ab.
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