23 Orionis is a double star located around 1,200 light-years (370 parsecs)[1] away from the Sun in the equatorial constellation of Orion.[12] It is visible to the naked eye as a dim, blue-white-hued point of light with a combined apparent visual magnitude of 4.99.[2] The pair are moving away from the Earth with a heliocentric radial velocity of +18 km/s,[5] and they are members of the Orion OB1 association, subgroup 1a.[13]
Quick facts Observation data Epoch J2000 Equinox J2000, Constellation ...
23 Orionis
Observation data
Epoch J2000 Equinox J2000 |
| Constellation |
Orion |
| Right ascension |
05h 22m 50.00474s[1] |
| Declination |
+03° 32′ 39.9770″[1] |
| Apparent magnitude (V) |
4.99[2] (4.95 + 6.76)[3] |
| Characteristics |
| Evolutionary stage |
main sequence |
| Spectral type |
B1V + B3V[4] |
| B−V color index |
−0.096±0.004[2] |
| Astrometry |
|---|
|
|---|
| Absolute magnitude (MV) | −2.93[2] |
|
|---|
|
|---|
| 23 Ori A |
|---|
| Radial velocity (Rv) | +18.0±3.7[5] km/s |
| Proper motion (μ) | RA: −2.414[1] mas/yr
Dec.: +1.230[1] mas/yr |
| Parallax (π) | 2.7199±0.3155 mas[1] |
| Distance | approx. 1,200 ly
(approx. 370 pc) |
| 23 Ori B |
|---|
| Radial velocity (Rv) | 28[6] km/s |
| Proper motion (μ) | RA: +1.275[7] mas/yr
Dec.: −0.552[7] mas/yr |
| Parallax (π) | 2.5579±0.0864 mas[7] |
| Distance | 1,280 ± 40 ly
(390 ± 10 pc) |
| Details |
|---|
| 23 Ori A |
|---|
| Mass | 12.5±0.6[8] M☉ |
| Radius | 6.97[9] R☉ |
| Luminosity | 26,546[10] L☉ |
| Surface gravity (log g) | 4.078±0.045[11] cgs |
| Temperature | 25,400[10] K |
| Rotational velocity (v sin i) | 350[4] km/s |
| Age | 15.4±0.6[8] Myr |
| 23 Ori B |
|---|
| Mass | 6.6±0.1[8] M☉ |
| Radius | 4.71[9] R☉ |
| Luminosity | 1,620[10] L☉ |
| Temperature | 18,700[10] K |
| Rotational velocity (v sin i) | 370[4] km/s |
| Age | 22.8±2.3[8] Myr |
| Other designations |
|---|
| 23 Ori, SAO 112697, WDS J05228+0333[12] |
| A: BD+03°871, HD 35149, HIP 25142, HR 1770, SAO 112697 |
| B: BD+03°872, HD 35148, HIP 25145, SAO 112699 |
| Database references |
|---|
| SIMBAD | data |
| B |
Close
Howe and Clarke (2009) catalog this as a double-lined spectroscopic binary star system[14] with a wide projected separation of 9,460 AU.[9] As of 2018, they had an angular separation of 31.9″ along a position angle of 30°.[3] The brighter member, component A, is a B-type main-sequence star with a stellar classification of B1V. The secondary, component B, is of class B3V.[4] Both stars are spinning rapidly.[4]