56 Orionis
In the constellation Orion
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56 Orionis is a single,[10] variable star in the equatorial constellation of Orion. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.76.[2] The star is located at a distance of approximately 1,130[1] light years from the Sun based on parallax.[1] It is drifting further away with a radial velocity of +11 km/s.[1] The star has a peculiar velocity of 19.0+2.9
−3.1 km/s relative to its neighbors, and may be a runaway star.[6]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 52m 26.43865s[1] |
| Declination | +01° 51′ 18.5021″[1] |
| Apparent magnitude (V) | 4.76[2] (4.73 to 4.78)[3] |
| Characteristics | |
| Spectral type | K2-IIb[4] |
| U−B color index | +1.46[5] |
| B−V color index | +1.382±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | +11.27±0.14[1] km/s |
| Proper motion (μ) | RA: –6.942[1] mas/yr Dec.: –8.355[1] mas/yr |
| Parallax (π) | 2.8794±0.1854 mas[1] |
| Distance | 1,130 ± 70 ly (350 ± 20 pc) |
| Absolute magnitude (MV) | −3.14[2] |
| Details | |
| Mass | 6.4±0.7[6] M☉ |
| Radius | 92.21+4.27 −6.72[1] R☉ |
| Luminosity | 2,547±187[1] L☉ |
| Surface gravity (log g) | 0.91[7] cgs |
| Temperature | 4,270+165 −96[1] K |
| Metallicity [Fe/H] | −0.07[7] dex |
| Rotational velocity (v sin i) | 3.5[8] km/s |
| Age | 60.7±18.4[6] Myr |
| Other designations | |
| 56 Ori, NSV 2690, BD+01°1151, FK5 2444, GC 7380, HD 39400, HIP 27750, HR 2037, SAO 113220, CCDM J05524+0151, WDS 05524+0151[9] | |
| Database references | |
| SIMBAD | data |
This object is a bright giant star with a stellar classification of K2-IIb.[4] It is a suspected variable star of unknown type with a brightness that has been measured varying from 4.73 down to 4.78.[3] The star is about 61[6] million years old with 6.4[6] times the mass of the Sun and is spinning with a projected rotational velocity of 3.5.[8] Having exhausted the supply of hydrogen at its core, the star has expanded to 92[1] times the radius of the Sun. It is radiating 2,547 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,270 K.[1]
It has one reported visual companion, designated component B, with magnitude 13.5 and angular separation 42.9″.[11]