HW Virginis
The HW Virginis system in Celestia. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 44m 20.2387s |
| Declination | −08° 40′ 16.849″ |
| 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 | |
| BD−07 3477, HIP 62157, 2MASS J12442024-0840168 | |
| Database references | |
| SIMBAD | data |
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.
John William Menzies and Freddy Marang announced their discovery of the eclipsing binary nature of this star in 1985.