39 Arietis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 02h 47m 54.54142s |
| Declination | +29° 14′ 49.6132″ |
| Apparent magnitude (V) | 4.514 |
| Characteristics | |
| Spectral type | K1.5 III |
| U−B color index | +1.083 |
| B−V color index | +1.118 |
| R−I color index | 0.58 |
| Astrometry | |
| Radial velocity (Rv) | –15.53 ± 0.14 km/s |
| Proper motion (μ) |
RA: +149.47 ± 0.25 mas/yr Dec.: –127.05 ± 0.18 mas/yr |
| Parallax (π) | 19.01 ± 0.21mas |
| Distance | 172 ± 2 ly (52.6 ± 0.6 pc) |
| Details | |
| Mass | 1.6 M☉ |
| Radius | 11.1 ± 0.8 R☉ |
| Luminosity | 56 L☉ |
| Surface gravity (log g) | 2.7 cgs |
| Temperature | 4,603 K |
| Metallicity [Fe/H] | –0.02 dex |
| Rotational velocity (v sin i) | 4.5 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
39 Arietis (abbreviated 39 Ari) is a star in the northern constellation of Aries. 39 Arietis is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of +4.5. The distance to this star, as determined from an annual parallax shift of 19.01 mas, is approximately 172 light-years (53 parsecs).
This is a giant star with a stellar classification of K1.5 III. It is currently at an evolutionary stage known as a red clump, indicating that it is generating energy through the fusion of helium at its core. 39 Arietis has 1.6 times the mass of the Sun, but its outer envelope has expanded to around 11 times the Sun's radius. It shines with 56 times the luminosity of the Sun. This energy is being radiated into outer space from its outer atmosphere at an effective temperature of 4,603 K, giving it the cool orange-hued glow of a K-type star.
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