Peter 176

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Star
gliese 176
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation bull
Right ascension 04 h 42 m 55.78 s
declination + 18 ° 57 ′ 29.4 ″
Apparent brightness 9.95 likes
Typing
Known exoplanets 1
B − V color index +1.51 
Spectral class M2
Astrometry
Radial velocity (+26.2 ± 0.2) km / s
parallax (107.83 ± 2.85)  mas
distance (30.2 ± 0.8)  ly
(9.27 ± 0.25)  pc  
Visual absolute brightness M vis +10.11 mag
Proper movement 
Rec. Share: (+656.85 ± 3.81)  mas / a
Dec. portion: (−1116.20 ± 2.49)  mas / a
Physical Properties
Dimensions approx. 0.5  M ☉
radius approx. 0.5  R ☉
Metallicity [Fe / H] −0.1
Rotation time 40 days
Other names
and catalog entries
Bonn survey BD + 18 ° 683
Henry Draper Catalog HD 285968 [1]
Gliese catalog FY 176 [2]
Hipparcos catalog HIP 21932 [3]
Tycho catalog TYC 1275-2034-1 [4]Template: Infobox star / maintenance / specification of the TYC catalog
Other names LHS 196 • Ross 33
annotation
  1. ↑ estimated from apparent brightness and distance

Gliese 176 (short: Gl 176 or GJ 176 ), also cataloged as HD 285968 , is a red dwarf in the constellation Taurus, about 30  light years from Earth . With an apparent brightness of 9.95 mag, it can no longer be seen with the naked eye, even under optimal observation conditions. In 2007 Michael Endl discovered an exoplanet orbiting this star with the help of the radial velocity method and is called Gliese 176 b or HD 285968 b .

Gliese 176 b

Gliese 176 b or HD 285968 b is an exoplanet that orbits the red dwarf every 10.24  days at a distance of approx. 0.073 astronomical units with an eccentricity of 0.23. Its mass is estimated to be at least about 0.076 masses of Jupiter (about 24 times the mass of the earth ).

Web links

Individual evidence

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ Pulkovo radial velocities for 35493 HIP stars
  3. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)