SMC 018136, also known as PMMR 37, is a red supergiant star located in the Small Magellanic Cloud. It is one of the largest stars and one of the most luminous SMC cool supergiants so far discovered, with a radius of 945 times that of the sun and a bolometric luminosity almost 200,000 times more than Sun. If it were in the place of the Sun, its photosphere would at least engulf the orbit of Mars.[6]
SMC 018136 is visible in the full-size image | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Tucana |
Right ascension | 0h 50m 56.095s[1] |
Declination | -72° -15m -6.07s[1] |
Apparent magnitude (V) | 11.61[2] |
Characteristics | |
Spectral type | K4.5 Ia-Ib,[3] M0Ia[4] |
Apparent magnitude (K) | 7.849±0.020[1] |
Astrometry | |
Radial velocity (Rv) | 185.7[5] km/s |
Details | |
Radius | 945[6] R☉ |
Luminosity | 186,000[6] L☉ |
Surface gravity (log g) | −0.4[7] cgs |
Temperature | 3,900[6] K |
Other designations | |
Database references | |
SIMBAD | data |
SMC 018136 has a spectral type M0 Ia[4] and an effective temperature 3,900 K,[6] although more recent papers suggest it has a slightly earlier spectral type of K4.5 Ia-Ib.[3]