HD 269810

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HD 269810 A / B

HD 269810 in NGC 2029
Observation data
Epoch J2000      Equinox J2000
Constellation Dorado
Right ascension 05h 35m 13.9s
Declination −67° 33′ 27.5″
Apparent magnitude (V) 12.283
Spectral type O2III(f*)[1]
U−B color index ?
B−V color index −0.23
Variable type None
Radial velocity (Rv) 303 km/s
Absolute magnitude (MV) −6.6[1]
Distance 170,000 Ly
Mass 150[1] M
Radius 18[1] R
Luminosity 2.2 million[1] L
Surface gravity (log g) cgs
Temperature 52,500[1] K
Metallicity ?
Rotation ?
Age ? years
Companion HD 269810 B
Semi-major axis (a) 0.007"
Other designations
GCRV 24403, RMC 122, UBV 5767, ARDB C54, SK[disambiguation needed] -67° 211, UCAC2 2218036, ARDB 317, GSC 09162-00101, TYC 9162-101-1, CSI-67-05351, 2MASS J05351389-6733275, UBV M 28781.
Database references

HD 269810 or HDE 269810 or R 122 in the Large Magellanic Cloud is a blue star. It is one of the most massive stars known, at 150 solar masses, and one of the most luminous, at over two million times the sun.


  1. ^ a b c d e f Walborn, N. R.; Morrell, N. I.; Howarth, I. D.; Crowther, P. A.; Lennon, D. J.; Massey, P.; Arias, J. I. (2004). "A CNO Dichotomy among O2 Giant Spectra in the Magellanic Clouds". The Astrophysical Journal 608 (2): 1028. arXiv:astro-ph/0403557. Bibcode:2004ApJ...608.1028W. doi:10.1086/420761.  edit

External links[edit]