Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Orion |
A | |
Right ascension | 05h 35m 08.27608s[1] |
Declination | +09° 56′ 02.9913″[1] |
Apparent magnitude (V) | 3.7[2] |
B | |
Right ascension | 05h 35m 08.48130s[3] |
Declination | +09° 56′ 06.0995″[3] |
Apparent magnitude (V) | 5.6[2] |
Characteristics | |
A | |
Spectral type | O8 III((f))[4] |
U−B color index | −1.01[5] |
B−V color index | −0.21[5] |
B | |
Spectral type | B0 V[5] |
U−B color index | −0.77[5] |
B−V color index | +0.04[5] |
Astrometry | |
Radial velocity (Rv) | +30.10[6] km/s |
A | |
Proper motion (μ) | RA: +2.896[1] mas/yr Dec.: −3.183[1] mas/yr |
Parallax (π) | 2.5936 ± 0.4032 mas[1] |
Distance | approx. 1,300 ly (approx. 390 pc) |
Absolute magnitude (MV) | −4.25 |
B | |
Proper motion (μ) | RA: +2.216[3] mas/yr Dec.: −1.986[3] mas/yr |
Parallax (π) | 2.4682 ± 0.1543 mas[3] |
Distance | 1,320 ± 80 ly (410 ± 30 pc) |
Absolute magnitude (MV) | −1.94 |
Details | |
A | |
Mass | 34[7] M☉ |
Radius | 13.4+3.9 −2.5[8] R☉ |
Luminosity | 200,000+117,000 −74,000[8] L☉ |
Surface gravity (log g) | 3.90[9] cgs |
Temperature | 35,000+2,000 −1,500[8] K |
Metallicity [Fe/H] | 0.03[9] dex |
Age | 4.2[7] Myr |
B | |
Mass | 10.3±0.7[10] M☉ |
Radius | 4.2±0.8[10] R☉ |
Luminosity | 6,300[10] L☉ |
Surface gravity (log g) | 4.21±0.10[10] cgs |
Temperature | 25,400±500[10] K |
Age | 1.8[10] Myr |
Other designations | |
A: HD 36861, HR 1879 | |
B: HD 36862, HR 1880 | |
Database references | |
SIMBAD | λ Ori |
A | |
B |
Meissa /ˈmaɪsə/, designated Lambda Orionis (λ Orionis, abbreviated Lambda Ori, λ Ori) is a star in the constellation of Orion. It is a multiple star approximately 1,300 ly away with a combined apparent magnitude of 3.33.[11] The main components are an O8 giant star and a B-class main sequence star, separated by about 4″. Despite Meissa being more luminous and only slightly further away than Rigel, it appears 3 magnitudes dimmer at visual wavelengths, with much of its radiation emitted in the ultraviolet due to its high temperature.
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