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HV 2112
Small Magellanic Cloud star in the constellation Tucana / From Wikipedia, the free encyclopedia
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HV 2112 is a cool luminous variable star in the Small Magellanic Cloud. Until 2018, it was considered to be the most likely candidate for a Thorne–Żytkow object, but it is now thought to be an asymptotic giant branch star.
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Tucana |
Right ascension | 01h 10m 03.858s[1] |
Declination | −72° 36′ 52.62″[1] |
Apparent magnitude (V) | 12.7 to below 16.7[2][3] |
Characteristics | |
Spectral type | M5.5 II (M3e – M7.5[4]) |
Apparent magnitude (J) | 10.020[1] |
Apparent magnitude (H) | 9.100[1] |
Apparent magnitude (K) | 8.723[1] |
U−B color index | +0.33[5] |
B−V color index | +1.80[5] |
Variable type | Mira?[6] |
Astrometry | |
Radial velocity (Rv) | 157[7] km/s |
Proper motion (μ) | RA: 1.116±0.073[8] mas/yr Dec.: −1.291±0.067[8] mas/yr |
Parallax (π) | −0.2029 ± 0.0446 mas[8] |
Absolute magnitude (MV) | −5.2[7] |
Details | |
Mass | ~5[9] M☉ |
Radius | 675 - 1,193[9][lower-alpha 1] R☉ |
Luminosity | 50,100 - 81,300[9] L☉ |
Surface gravity (log g) | 0.0[7] cgs |
Temperature | 2,500 - 3,750[9] K |
Metallicity [Fe/H] | -2.18[10] dex |
Other designations | |
Database references | |
SIMBAD | data |
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