Meissa
Star in the constellation Orion / From Wikipedia, the free encyclopedia
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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.
Quick Facts Observation data Epoch J2000 Equinox J2000, Apparent magnitude (V) ...
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 | 27.9±3.3[7] M☉ |
Radius | 13.4[8] R☉ |
Luminosity | 165,000[5] L☉ |
Surface gravity (log g) | 3.90[9] cgs |
Temperature | 35,000[8] K |
Metallicity [Fe/H] | 0.03[9] dex |
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 |
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