Ross 47

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Ross 47
Observation data
Epoch J1950.0        Equinox J1950.0
Constellation Orion
Right ascension 05h 42m 09.26769s [1]
Declination +12° 29 21.6048 [1]
Apparent magnitude  (V)+11.48 - 11.55 [2]
Characteristics
Evolutionary stage red dwarf
Spectral type M4V [3]
U−B color index +14.264
B−V color index +13.130
Variable type BY Dra [2]
Astrometry
Radial velocity (Rv)106.06±0.18 [1]  km/s
Proper motion (μ)RA: +1,997.342 [1]   mas/yr
Dec.: −1569.63 [1]   mas/yr
Parallax (π)172.6762 ± 0.0286  mas [1]
Distance 18.888 ± 0.003  ly
(5.7912 ± 0.0010  pc)
Absolute magnitude  (MV)+12.73 [4]
Details
Mass 0.218±0.005 [5]   M
Radius 0.238±0.009 [5]   R
Luminosity 0.006288±0.000094 [5]   L
Surface gravity (log g)4.44 [1]   cgs
Temperature 3,334+67
−63
[5]   K
Metallicity [Fe/H]−0.19±0.17 [6]   dex
Rotation 170 [7]
Rotational velocity (v sin i)3.1 [8]  km/s
Age 7.1 [9]   Gyr
Other designations
V1352 Ori, GJ  213, HIP  26857, Ci  20 344, G 102-22, LFT  425, LHS  31, LTT  11704, NLTT  15489, Ross  47, TYC  722-455-1, 2MASS J05420897+1229252 [10]
Database references
SIMBAD data
Orion constellation map.svg
Red pog.png
Ross 47
Location of Ross 47 in the constellation Orion

Ross 47 is a variable star of spectral type M4 located in the constellation Orion, 19 light-years from Earth.

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References

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