HP Lyrae
Variable star in the constellation Lyra / From Wikipedia, the free encyclopedia
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HP Lyrae (HP Lyr) is a variable star in the constellation Lyra, with a visual magnitude varying between 10.2 and 10.8. It is likely to be an RV Tauri variable, an unstable post-AGB star losing mass before becoming a white dwarf.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lyra |
Right ascension | 19h 21m 39.066s[2] |
Declination | +39° 56′ 08.05″[2] |
Apparent magnitude (V) | 10.43[3] (10.2 - 10.8[4]) |
Characteristics | |
Spectral type | A2-F2 Iab[4] |
U−B color index | +0.1 - +0.5[4] |
B−V color index | +0.3 - +0.7[4] |
Variable type | RV Tau[5] |
Astrometry | |
Radial velocity (Rv) | −107[5] km/s |
Proper motion (μ) | RA: −2.485±0.038[6] mas/yr Dec.: −5.500±0.047[6] mas/yr |
Parallax (π) | 0.0822 ± 0.0242 mas[6] |
Distance | 6,700±380[7] pc |
Absolute magnitude (MV) | −4.5[4] |
Orbit[7] | |
Period (P) | 1,631 days |
Eccentricity (e) | 0.17 |
Argument of periastron (ω) (secondary) | 5.5° |
Semi-amplitude (K1) (primary) | 7.7 km/s |
Details[5] | |
Mass | 0.6[7] M☉ |
Radius | 60[7] R☉ |
Luminosity | 3,900±400[7] L☉ |
Surface gravity (log g) | 1.0 cgs |
Temperature | 5,900[7] K |
Metallicity [Fe/H] | −1.0 dex |
B | |
Mass | 0.5 - 0.6[7] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
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