 39 Arietis in optical light | |
| 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 | 10.22±0.72[6] R☉ |
| Luminosity | 48.7±0.7[6] L☉ |
| Surface gravity (log g) | 2.7[4] cgs |
| Temperature | 4,768±167[6] K |
| Metallicity [Fe/H] | –0.02[4] dex |
| Rotational velocity (v sin i) | 4.5[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
39 Arietis (abbreviated 39 Ari), officially named Lilii Borea /ˈlɪliaɪ ˈbɔːriə/,[8] 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.
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