10 Lacertae

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10 Lacertae
10 Lacertae Celestia.jpg
10 Lacertae in Celestia
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lacerta
Right ascension 22h 39m 15.67864s [1]
Declination +39° 03′ 00.9712″ [1]
Spectral type O9V [1]

10 Lacertae (10 Lac) is a star in the constellation Lacerta. Its apparent magnitude is 4.88. Located around 529 parsecs (1,730 ly) distant, it is a hot blue main-sequence star of spectral type O9V,[1] a massive star that is currently fusing its core hydrogen. 10 Lacertae was one of the first O-type stars (along with S Monocerotis) to be defined as an anchor point for the MKK spectral classification; since the early twentieth century it has served as such a point. Specifically, the star is representative of O9V stars, meaning relatively cool O-type stars on the main-sequence.[2]


  1. ^ a b c d "10 Lacertae". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 6 January 2014. 
  2. ^ Garrison, R. F. (1994). "A Hierarchy of Standards for the MK Process". Astronomical Society of the Pacific 60: 3. Bibcode:1994ASPC...60....3G.