Feige 55

HD 149382

Observation data Epoch J2000      Equinox J2000
Constellation	Ursa Major
Right ascension	12^h 04^m 38.91^s
Declination	+60° 32′ 09.3″
Apparent magnitude (V)	+13.45
Characteristics
Spectral type	DAO+M5.5V
Astrometry
Distance	665 ly (204±24 pc)
Details
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
SIMBAD	data

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]

References

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: 12^h 04^m 38.91^s, +60° 32′ 09.3″