Feige 55

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HD 149382
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 12h 04m 38.91s
Declination +60° 32′ 09.3″
Apparent magnitude (V) +13.45
Spectral type DAO+M5.5V
Distance 665 ly
(204±24 pc)
Mass 0.486/0.3 M
Radius 0.0345/0.33? R
Luminosity 10.7/0.0079 L
Temperature 56,300/3000? K
Other designations
Feige 55
Database references

Feige 55 is a hot white dwarf approximately 665 light-years away from the Sun in the constellation of Ursa Major. The star is likely a post-AGB star with relatively high luminosity for a standard white dwarf. It is also in a close binary system with orbital period of 1.4933 days.[1]


  1. ^ Holberg; et al. (1995). "The Binary Double-degenerate Nature of the Bright DAO White Dwarf Feige 55". The Astrophysical Journal Letters. 452: 133–137. Bibcode:1995ApJ...452L.133H. doi:10.1086/309735. 

Coordinates: Sky map 12h 04m 38.91s, +60° 32′ 09.3″