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Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Minor |
Right ascension | 15h02m 09.6297s[1] |
Declination | +66° 12′ 19.1461″[1] |
Apparent magnitude (V) | 15.9 |
Characteristics | |
Astrometry | |
Proper motion (μ) | RA: −6.055±0.128[1] mas/yr Dec.: 8.106±0.112[1] mas/yr |
Parallax (π) | 2.0573 ± 0.0591 mas[1] |
Distance | 1,590 ± 50 ly (490 ± 10 pc) |
Details | |
Temperature | 200,000 K |
Other designations | |
WD 1501+663 | |
Database references | |
SIMBAD | data |
H1504+65 is an enigmatic peculiar star in the constellation Ursa Minor. With a surface temperature of 200,000 K (360,000°F) and an atmosphere composed of carbon, oxygen and 2% neon, it is the second hottest white dwarf ever discovered, with only RX J0439.8−6809 being hotter. It is thought to be the stellar core of a post-asymptotic giant branch star, though its composition is unexplainable by current models of stellar evolution.[2]
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