HW Virginis

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Double star
HW Virginis
AladinLite
Observation
dates equinoxJ2000.0 , epoch : J2000.0
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
Proper movement 
Rec. Share: (8.97 ± 0.18)  mas / a
Dec. portion: (-15.68 ± 0.11)  mas / a
Physical Properties
Dimensions 0.63  M
Other names
and catalog entries
Bonn survey BD -07 ° 3477
Hipparcos catalog HIP 62157 [1]
Tycho catalog TYC 5528-629-1 [2]
2MASS catalog 2MASS J12442024-0840168 [3]
Other names HW Virginis

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

  1. a b c d e f BD − 07 3477. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 16, 2018 .
  2. a b HW Vir. In: VSX. AAVSO, accessed September 16, 2018 .
  3. a b c HW Vir (AB) b. In: Extrasolar Planets Encyclopaedia . Retrieved September 16, 2018 .