The red dot shows the location of Groombridge 1830 in Ursa Major. | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
Right ascension | 11h 52m 58.7675s[1] |
Declination | +37° 43′ 07.2553″[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) | –98.0[5] km/s |
Proper motion (μ) | RA: 4002.567±0.070[1] mas/yr Dec.: −5817.856±0.056[1] mas/yr |
Parallax (π) | 108.9551 ± 0.0490 mas[1] |
Distance | 29.93 ± 0.01 ly (9.178 ± 0.004 pc) |
Absolute magnitude (MV) | 6.64[6] |
Details | |
Mass | 0.661[7] M☉ |
Radius | 0.681 ± 0.006[8] R☉ |
Luminosity | 0.212 ± 0.002[8] L☉ |
Surface gravity (log g) | 4.68[9] cgs |
Temperature | 4,759 ± 20[8] K |
Metallicity [Fe/H] | –1.33[9] dex |
Age | 4.7–5.3[10] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Groombridge 1830 (also known as 1830 Groombridge or Argelander's Star)[11] is a star in the constellation Ursa Major.
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