Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Orion |
Right ascension | 05h 35m 23.16427s [1] |
Declination | −4° 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 | 15.6 R☉ |
Luminosity | 10737 L☉ |
Temperature | 25,400 [6] K |
Rotational velocity (v sin i) | 20 [7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
42 Orionis 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. [8] [9]
c Orionis is surrounded by NGC 1977 one of a smaller fainter group of named nebulae just north of the Orion Nebula. c Ori is the star which excites and illuminates NGC 1977.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Orion |
Right ascension | 05h 35m 23.16427s [1] |
Declination | −4° 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 | 15.6 R☉ |
Luminosity | 10737 L☉ |
Temperature | 25,400 [6] K |
Rotational velocity (v sin i) | 20 [7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
42 Orionis 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. [8] [9]
c Orionis is surrounded by NGC 1977 one of a smaller fainter group of named nebulae just north of the Orion Nebula. c Ori is the star which excites and illuminates NGC 1977.