39 Arietis
Star in the constellation Aries / From Wikipedia, the free encyclopedia
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39 Arietis (abbreviated 39 Ari), officially named Lilii Borea /ˈlɪliaɪ ˈbɔːriə/,[7] is a star in the northern constellation of Aries. It is visible to the naked eye with an apparent visual magnitude of +4.5.[2] The distance to this star, as determined from an annual parallax shift of 19.01 mas,[1] is approximately 172 light-years (53 parsecs). This star was formerly located in the obsolete constellation Musca Borealis.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aries |
Right ascension | 02h 47m 54.54142s[1] |
Declination | +29° 14′ 49.6132″[1] |
Apparent magnitude (V) | 4.514[2] |
Characteristics | |
Spectral type | K1.5 III[3] |
U−B color index | +1.083[2] |
B−V color index | +1.118[2] |
R−I color index | 0.58 |
Astrometry | |
Radial velocity (Rv) | –15.53 ± 0.14[4] km/s |
Proper motion (μ) | RA: +149.47 ± 0.25[1] mas/yr Dec.: –127.05 ± 0.18[1] mas/yr |
Parallax (π) | 19.01 ± 0.21 mas[1] |
Distance | 172 ± 2 ly (52.6 ± 0.6 pc) |
Details | |
Mass | 1.6[5] M☉ |
Radius | 11.1 ± 0.8[3] R☉ |
Luminosity | 56[4] L☉ |
Surface gravity (log g) | 2.7[4] cgs |
Temperature | 4,603[4] K |
Metallicity [Fe/H] | –0.02[4] dex |
Rotational velocity (v sin i) | 4.5[4] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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