HW Virginis
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Double star HW Virginis |
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| AladinLite | |||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Virgin | ||||||||||
| Right ascension | 12 h 44 m 20.24 s | ||||||||||
| declination | -08 ° 40 ′ 16.8 ″ | ||||||||||
| Apparent brightness | 10.59 (10.48 to 11.38) mag | ||||||||||
| Typing | |||||||||||
| Known exoplanets | 1 | ||||||||||
| B − V color index | (-0.13) | ||||||||||
| Spectral class | sdB + M | ||||||||||
| Variable star type | EA / HW | ||||||||||
| Astrometry | |||||||||||
| Radial velocity | (-13.0 ± 0.8) km / s | ||||||||||
| parallax | (5.80 ± 0.08) mas | ||||||||||
| distance | (562 ± 8) ly (172) pc |
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| Proper movement | |||||||||||
| Rec. Share: | (8.97 ± 0.18) mas / a | ||||||||||
| Dec. portion: | (-15.68 ± 0.11) mas / a | ||||||||||
| Physical Properties | |||||||||||
| Dimensions | 0.63 M ☉ | ||||||||||
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Other names and catalog entries |
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HW Virginis is a binary star system consisting of a blue subdwarf and a red or brown dwarf of the spectral class M at a distance of about 560 light years . It is the prototype of the so-called HW Virginis stars , which belong to the variable eclipse stars .
The HW-Virginis system also contains a planet discovered in 2008, whereby this object could also be a brown dwarf due to the high mass of 14 Jupiter .
Individual evidence
- ↑ a b c d e f BD − 07 3477. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 16, 2018 .
- ↑ a b HW Vir. In: VSX. AAVSO, accessed September 16, 2018 .
- ↑ a b c HW Vir (AB) b. In: Extrasolar Planets Encyclopaedia . Retrieved September 16, 2018 .