Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Orion |
Right ascension | 05h 35m 23.16427s [1] |
Declination | −04° 50′ 18.0881″ [1] |
Apparent magnitude (V) | 4.59 [2] |
Characteristics | |
Spectral type | B1V [3] |
U−B color index | −0.94 [2] |
B−V color index | −0.19 [2] |
Astrometry | |
Radial velocity (Rv) | +28.40 [4] km/s |
Proper motion (μ) | RA: +4.52 [1] mas/yr Dec.: −7.11 [1] mas/yr |
Parallax (π) | 3.69±1.20 mas [1] |
Distance | approx. 900 ly (approx. 270 pc) |
Details | |
Mass | 12.0 [5] M☉ |
Radius | 7.0 [6] R☉ |
Luminosity | 10,737 [7] L☉ |
Surface gravity (log g) | 3.82 [6] cgs |
Temperature | 25,400 [7] K |
Rotational velocity (v sin i) | 20 [8] km/s |
Age | 2.6 [5] Myr |
Other designations | |
c Orionis, BD−04°1185, CCDM J05354-0450AB, GC 6934, HIP 26237, HR 1892, HD 37018, NSV 2318, SAO 132320, WDS J05354-0450AB | |
Database references | |
SIMBAD | data |
42 Orionis, also known as c Orionis or c Ori, is a class B1V [3] (blue main-sequence) star in the constellation Orion. Its apparent magnitude is 4.59 [2] and it is approximately 900 light years away based on parallax. [1]
The primary star, Aa, has one spectroscopic companion Ab of magnitude 6.3 and separation 0.16", and a more distant companion B of 7.5 magnitude at 1.6" separation. [9] [10]
42 Orionis is surrounded by NGC 1977 one of a smaller fainter group of named nebulae just north of the Orion Nebula. 42 Ori is the star which excites and illuminates NGC 1977.