Groombridge 1618

Groombridge 1618
Groombridge 1618 is located in the constellation Ursa Major.
Groombridge 1618 is located in the constellation Ursa Major.
Groombridge 1618
Location of Groombridge 1618 in the constellation Ursa Major

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 10h 11m 22.13995s[1]
Declination +49° 27′ 15.2510″[1]
Apparent magnitude (V) +6.60[2]
Characteristics
Spectral type K7.5 Ve[3]
U−B color index +1.27[2]
B−V color index +1.34[2]
Variable type BY Dra,[4] Flare star[5]
Astrometry
Radial velocity (Rv)−26.48±0.12[1] km/s
Proper motion (μ) RA: −1363.287±0.016 mas/yr[1]
Dec.: −505.770±0.020 mas/yr[1]
Parallax (π)205.3148 ± 0.0224 mas[1]
Distance15.886 ± 0.002 ly
(4.8706 ± 0.0005 pc)
Absolute magnitude (MV)8.11[6]
Details
Mass0.670±0.033[7] M☉
Radius0.605±0.02[7] R☉
Luminosity (bolometric)0.15[8] L☉
Luminosity (visual, LV)0.049 L☉
Habitable zone inner limit0.398[9][note 1] au
Habitable zone outer limit0.755[9] au
Surface gravity (log g)4.51;[10] 4.70[7] cgs
Temperature3,970[10] K
Metallicity [Fe/H]–0.03[10] dex
Rotational velocity (v sin i)2.8[11] km/s
Age6.6[8] Gyr
Other designations
BD+50° 1725, GJ 380, HD 88230, HIP 49908, SAO 43223, LFT 696, IRAS 10082+4942[12]
Database references
SIMBADdata

Groombridge 1618 is a star in the northern constellation Ursa Major. With an apparent visual magnitude of +6.6, it lies at or below the threshold of stars visible to the naked eye for an average observer. It is relatively close to Earth, at 15.89 light-years (4.87 pc). This is a main sequence star of spectral type K7.5 Ve, having just 67% of the Sun's mass.

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  2. ^ a b c Cite error: The named reference mnras133_475 was invoked but never defined (see the help page).
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  7. ^ a b c Cite error: The named reference aaa397_L5 was invoked but never defined (see the help page).
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  9. ^ a b Cite error: The named reference kopparapu-2013 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference mnras356 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference apj660_1_732 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).


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