R136a1
Wolf–Rayet star with one of the highest mass and luminosity of any known star / From Wikipedia, the free encyclopedia
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R136a1 (short for RMC 136a1) is one of the most massive and luminous stars known, at nearly 200 M☉ and nearly 4.7 million L☉, and is also one of the hottest, at around 46,000 K. It is a Wolf–Rayet star at the center of R136, the central concentration of stars of the large NGC 2070 open cluster in the Tarantula Nebula (30 Doradus) in the Large Magellanic Cloud. The cluster can be seen in the far southern celestial hemisphere with binoculars or a small telescope, at magnitude 7.25. R136a1 itself is 100 times fainter than the cluster and can only be resolved using speckle interferometry.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Dorado |
Right ascension | 5h 38m 42.39s[1] |
Declination | −69° 06′ 02.91″[1] |
Apparent magnitude (V) | 12.23[1] |
Characteristics | |
Evolutionary stage | Wolf–Rayet star |
Spectral type | WN5h[2] |
B−V color index | 0.03[1] |
Astrometry | |
Distance | 163,000 ly (49,970[3] pc) |
Absolute magnitude (MV) | −8.18[4] |
Details | |
Mass | 196+34 −27[5] M☉ |
Radius | 42.7[6] R☉ |
Luminosity | 4,677,000[5] L☉ |
Surface gravity (log g) | 3.65[6] cgs |
Temperature | 46,000+1,250 −2,375[6] K |
Rotational velocity (v sin i) | 160[6] km/s |
Age | 1.14+0.17 −0.14[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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