70 Cancri
Star in the constellation Cancer
From Wikipedia, the free encyclopedia
70 Cancri is a star in the zodiac constellation of Cancer, located around 580 light years from the Sun.[1] It is a challenge to view with the naked eye even under good seeing conditions, having an apparent visual magnitude of 6.7.[2] The star is moving closer to the Earth with a heliocentric radial velocity of -21 km/s,[5] and is expected to come to within 44 light-years in around nine million years.[6] It is an A-type main-sequence star[3] with a stellar classification of A1V.[3] The object has a radius of about 3.1 R☉ and is radiating 69 times the Sun's luminosity from its photosphere at an effective temperature of 9,406 K.[7]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 09h 04m 09.86704s[1] |
| Declination | +27° 53′ 53.9089″[1] |
| Apparent magnitude (V) | 6.665[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A1V[3] |
| U−B color index | +0.05[4] |
| B−V color index | +0.00[4] |
| Astrometry | |
| Radial velocity (Rv) | −21.0±4.4[5] km/s |
| Proper motion (μ) | RA: −1.287[1] mas/yr Dec.: −1.429[1] mas/yr |
| Parallax (π) | 5.6109±0.1390 mas[1] |
| Distance | 580 ± 10 ly (178 ± 4 pc) |
| Absolute magnitude (MV) | 0.24[6] |
| Details | |
| Mass | 2.39[7] M☉ |
| Radius | 3.13[7] R☉ |
| Luminosity | 69[7] L☉ |
| Surface gravity (log g) | 3.83[7] cgs |
| Temperature | 9,406[7] K |
| Age | 867[8] Gyr |
| Other designations | |
| 70 Cnc, BD+28°1683, HD 77557, HIP 44512, HR 3601, SAO 80609[9] | |
| Database references | |
| SIMBAD | data |