| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 40m 06.41823s[1] |
| Declination | +20° 00′ 28.0339″[1] |
| Apparent magnitude (V) | 6.39[2] |
| Characteristics | |
| Spectral type | G8+ III-IIIb[3] |
| B−Vcolor index | 0.98[2] |
| Astrometry | |
| Radial velocity (Rv) | 33.88[2] km/s |
| Proper motion (μ) | RA: −35.610[1]mas/yr Dec.: −11.964[1]mas/yr |
| Parallax (π) | 5.3162±0.0589 mas[1] |
| Distance | 614 ± 7 ly (188 ± 2 pc) |
| Details | |
| Mass | 2.88[2] M☉ |
| Radius | 12[4] R☉ |
| Luminosity | 105[2] L☉ |
| Surface gravity (log g) | 2.70±0.11[5] cgs |
| Temperature | 4,954±25[2] K |
| Metallicity [Fe/H] | +0.21±0.05[5] dex |
| Age | 460[2] Myr |
| Other designations | |
| 39 Cnc,BD+20°2158,HD 73665,HIP 42516,HR 3427,SAO 80333[6] | |
| Database references | |
| SIMBAD | data |
39 Cancri is astar in theconstellationCancer, located about 614 light years from the Sun in theBeehive Cluster (NGC 2632). It is a challenge to see with the naked eye, having anapparent visual magnitude of 6.39.[2] This object is moving further from the Earth with a heliocentricradial velocity of 34 km/s.[2]
This is anevolvedgiant star with astellar classification of G8+ III-IIIb,[3] indicating it has consumed the hydrogen at its core. It is 460[2] million years old with 2.88[2] times themass of the Sun and about 12[4] times theSun's radius. The star is radiating 105[2] times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 4,954 K.[2]
