Groombridge 1830

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Stern
Groombridge 1830
Location of Groombridge 1830 (HR 4550, lower, left corner) in relation to Chi UMa and Psi UMa.
Location of Groombridge 1830 (HR 4550, lower, left corner) in relation to Chi UMa and Psi UMa .
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Big Bear
Right ascension 11 h 52 m 58.77 s
declination + 37 ° 43 ′ 7.2 ″
Apparent brightness 6.42 mag
Typing
B − V color index +0.75 
U − B color index +0.17 
R − I index +0.45 
Spectral class G8 Vp
Astrometry
Radial velocity (−98.3 ± 0.1) km / s
parallax (108.96 ± 0.05)  mas
distance (29.92 ± 0.02)  ly
(9.18 ± 0.01)  pc
Visual absolute brightness M vis approx. +6.6 mag
Proper movement 
Rec. Share: (+4002.57 ± 0.07)  mas / a
Dec. portion: (−5817.86 ± 0.06)  mas / a
Physical Properties
Dimensions (0.703 ± 0.013)  M ☉
radius (0.696 ± 0.021)  R ☉
Other names
and catalog entries
Bonn survey BD + 38 ° 2285
Bright Star Catalog HR 4550 [1]
Henry Draper Catalog HD 103095 [2]
Gliese catalog FY 451 [3]
Hipparcos catalog HIP 57939 [4]
SAO catalog SAO 62738 [5]
Tycho catalog TYC 3014-574-1 [6]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J11525880 + 3743060 [7]
Other names LHS 44 • FK5  1307
annotation
  1. ↑ estimated from apparent brightness and distance

Groombridge 1830 is a faint star in the constellation Great Bear . He was cataloged by Stephen Groombridge and belongs to the class of red sub-dwarfs . It is about 30 light years away from the sun . Its apparent brightness is just below the limit of visibility for the naked eye.

Groombridge 1830 is a fast runner . Its high self-movement was described by Friedrich Wilhelm Argelander in 1842 .

Individual evidence

  1. ↑ a b c HD 103095. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed April 20, 2019 .
  2. ↑ a b Hipparcos catalog (ESA 1997)
  3. ↑ a b c Bright Star Catalog
  4. ↑ Pulkovo radial velocities for 35493 HIP stars
  5. ↑ a b P. E. Kervella, F. Arenou, F. Mignard, F. Thévenin: Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly . In: Astronomy & Astrophysics . 623, p. A72. arxiv : 1811.08902 . bibcode : 2019A & A ... 623A..72K . doi : 10.1051 / 0004-6361 / 201834371 .