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