HV 2112

HV 2112
HV-2112
HV 2112 (circled in red)
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☉
Radius675 - 1,193[9][a] R☉
Luminosity50,100 - 81,300[9] L☉
Surface gravity (log g)0.0[7] cgs
Temperature2,500 - 3,750[9] K
Metallicity [Fe/H]-2.18[10] dex
Other designations
HV 2112, 2MASS J01100385-7236526, SMC V2156,[6] PMMR 187[11]
Database references
SIMBADdata

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.

  1. ^ a b c d e Cite error: The named reference 2mass was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference kochanek was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference shappee was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference wood was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference boyer was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference levesque was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference dr2 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference beasor was invoked but never defined (see the help page).
  10. ^ Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. S2CID 131780028.
  11. ^ "HV 2112". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-05-05.


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