Theta2 Orionis
Star in the constellation Orion / From Wikipedia, the free encyclopedia
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For other stars with this Bayer designation, see θ Orionis.
Theta2 Orionis (θ2 Ori) is a multiple star system in the constellation Orion. It is a few arc minutes from its more famous neighbour the Trapezium Cluster, also known as θ1 Orionis.
Quick Facts Observation data Epoch J2000 Equinox J2000, Apparent magnitude (V) ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Orion |
A | |
Right ascension | 05h 35m 22.90124s[1] |
Declination | −05° 24′ 57.8326″[1] |
Apparent magnitude (V) | 5.02[2] |
B | |
Right ascension | 05h 35m 26.40075s[3] |
Declination | −05° 25′ 00.7938″[3] |
Apparent magnitude (V) | 6.380[4] |
C | |
Right ascension | 05h 35m 31.43111s[5] |
Declination | −05° 25′ 16.3717″[5] |
Apparent magnitude (V) | 8.18[6] |
Characteristics | |
Spectral type | O9.5IVp[7] + B0.7V[8] + B5V[9] |
Astrometry | |
A | |
Radial velocity (Rv) | 35.6[10] km/s |
Proper motion (μ) | RA: +2.630[1] mas/yr Dec.: +2.394[1] mas/yr |
Parallax (π) | 2.9728 ± 0.2136 mas[1] |
Distance | 1,100 ± 80 ly (340 ± 20 pc) |
Absolute magnitude (MV) | −4.3[11] |
B | |
Proper motion (μ) | RA: +1.161[3] mas/yr Dec.: +0.162[3] mas/yr |
Parallax (π) | 2.3870 ± 0.0499 mas[3] |
Distance | 1,370 ± 30 ly (419 ± 9 pc) |
Absolute magnitude (MV) | −2.60[4] |
C | |
Proper motion (μ) | RA: +2.510[5] mas/yr Dec.: +3.731[5] mas/yr |
Parallax (π) | 2.4513 ± 0.0380 mas[5] |
Distance | 1,330 ± 20 ly (408 ± 6 pc) |
Absolute magnitude (MV) | −0.6[12] |
Details | |
A | |
Mass | 39[13] M☉ |
Luminosity | 107,000[14] L☉ |
Temperature | 34,900[14] K |
Rotational velocity (v sin i) | 133[8] km/s |
B | |
Mass | 14.8[4] M☉ |
Radius | 4.3[4] R☉ |
Luminosity | 12,300[4] L☉ |
Surface gravity (log g) | 4.30[4] cgs |
Temperature | 29,300[4] K |
Rotational velocity (v sin i) | 33[8] km/s |
Age | <2[4] Myr |
C | |
Mass | 4.86[14] M☉ |
Luminosity | 616[14] L☉ |
Temperature | 13,800[14] K |
Rotational velocity (v sin i) | 78[15] km/s |
Age | <1[15] Myr |
Other designations | |
θ2 Ori A: 43 Ori, HR 1897, BD−05°1319, HD 37041, SAO 132321, HIP 26235, CCDM 05353-0524E | |
θ2 Ori B: BD−05°1320, HD 37042, SAO 132322, CCDM 05353-0524F | |
θ2 Ori C: V361 Ori, BD−05°1326, HD 37062, SAO 132329, S 490A, CCDM 05353-0524G | |
Database references | |
SIMBAD | data |
data2 | |
data3 |
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