HW Virginis
HW Virginis, abbreviated HW Vir, is an eclipsing binary system (of the Algol type), approximately 563 light-years away based on the parallax measured by the Gaia spacecraft, in the constellation of Virgo. The system comprises an eclipsing B-type subdwarf star and red dwarf star. The two stars orbit each other every 0.116795 days.
The HW Virginis system in Celestia. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 44m 20.2387s |
| Declination | −08° 40′ 16.8486″ |
| Apparent magnitude (V) | 10.69 |
| Characteristics | |
| Spectral type | sdB / dM |
| Variable type | eclipsing binary |
| Astrometry | |
| Proper motion (μ) | RA: 8.969±0.175 mas/yr Dec.: −15.677±0.107 mas/yr |
| Parallax (π) | 5.7972 ± 0.0849 mas |
| Distance | 563 ± 8 ly (172 ± 3 pc) |
| Absolute magnitude (MV) | 4.22 (sdB) + 15.59 (dM) |
| Absolute bolometric magnitude (Mbol) | 1.46 (sdB) + 11.20 (dM) |
| Orbit | |
| Period (P) | 0.11671967 d |
| Semi-major axis (a) | 0.860 ± 0.010 R☉ |
| Eccentricity (e) | <0.0003 |
| Inclination (i) | 80.98 ± 0.10° |
| Details | |
| sdB | |
| Mass | 0.485 ± 0.013 M☉ |
| Radius | 0.183 ± 0.026 R☉ |
| Luminosity | 19.7 ± 5.6 L☉ |
| Temperature | 28488 ± 208 K |
| dM | |
| Mass | 0.142 ± 0.004 M☉ |
| Radius | 0.175 ± 0.026 R☉ |
| Luminosity | 0.003 ± 0.001 L☉ |
| Temperature | 3084 ± 889 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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