Groombridge 1830

Groombridge 1830
The red dot shows the location of Groombridge 1830 in Ursa Major.

Detailed position of HR 4550 ( = Groombridge 1830; bottom-left edge) related to Chi UMa and Psi UMa.
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 11h 52m 58.76734s[1]
Declination +37° 43′ 07.2541″[1]
Apparent magnitude (V) 6.44[2]
Characteristics
Spectral type G8VIp[3]
U−B color index +0.16[2]
B−V color index +0.75[2]
Variable type Suspected[4]
Astrometry
Radial velocity (Rv)−98.05±0.12[1] km/s
Proper motion (μ) RA: +4002.7 mas/yr[1]
Dec.: −5817.8 mas/yr[1]
Parallax (π)109.0296 ± 0.0197 mas[1]
Distance29.914 ± 0.005 ly
(9.172 ± 0.002 pc)
Absolute magnitude (MV)6.64[5]
Details[6]
Mass0.63±0.02 M☉
Radius0.586±0.004 R☉
Luminosity0.221±0.005 L☉
Surface gravity (log g)4.702±0.015 cgs
Temperature5,174±32 K
Metallicity [Fe/H]−1.26±0.07 dex
Age4.7–5.3[7] Gyr
Other designations
BD+38 2285, FK5 1307, GCTP 2745.00, GJ 451, HIP 57939, HR 4550, HD 103095, LHS 44, LTT 13276, SAO 62738, 1830 Groombridge, Argelander's Star
Database references
SIMBADdata

Groombridge 1830 (also known as 1830 Groombridge or Argelander's Star)[8] is a star in the constellation Ursa Major.

  1. ^ a b c d e Cite error: The named reference Gaia DR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference mnras133_475 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference yerkes53 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference csvs was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Karovicova was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference apj687 was invoked but never defined (see the help page).
  8. ^ Peters, C. A. F.; "On the Parallax of Argelander's Star", Monthly Notices of the Royal Astronomical Society, December 1853, v.50, p.302, Bibcode:1853MNRAS..14...49P