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 | |
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 |
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]
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]
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 | |
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 |
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]
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]