HD 81817

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HD 81817
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Draco
Right ascension 09h 37m 05.28778s[1]
Declination +81° 19′ 34.9711″[1]
Spectral type K3III + DA2.8[2]
Database references

HD 81817 is a star in the constellation Draco. Its apparent magnitude is 4.27 and it is a spectroscopic binary system containing a red giant and a white dwarf.


  1. ^ a b Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ Holberg, J. B.; Oswalt, T. D.; Sion, E. M.; Barstow, M. A.; Burleigh, M. R. (2013). "Where are all the Sirius-like binary systems?". Monthly Notices of the Royal Astronomical Society. 435 (3): 2077. arXiv:1307.8047Freely accessible. Bibcode:2013MNRAS.435.2077H. doi:10.1093/mnras/stt1433.