Alpha Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 58m 29.2042s |
| Declination | +11° 51′ 27.649″ |
| Apparent magnitude (V) | 4.20 to 4.27 |
| Characteristics | |
| Spectral type | kA7VmF0/2III/IVSr |
| U−B color index | +0.15 |
| B−V color index | +0.14 |
| R−I color index | +0.04 |
| Astrometry | |
| Radial velocity (Rv) | −12.1±0.8 km/s |
| Proper motion (μ) | RA: 42.181 mas/yr Dec.: −31.160 mas/yr |
| Parallax (π) | 18.3304±0.3216 mas |
| Distance | 178 ± 3 ly (54.6 ± 1.0 pc) |
| Absolute magnitude (MV) | 0.46 |
| Details | |
| A | |
| Mass | 2.10 M☉ |
| Radius | 3.655 R☉ |
| Luminosity | 49 L☉ |
| Surface gravity (log g) | 3.73 cgs |
| Temperature | 7,943 K |
| Rotational velocity (v sin i) | 75 km/s |
| B | |
| Mass | 0.38 M☉ |
| Other designations | |
| Acubens, Sertan, Sartan, α Cnc, Alpha Cancri, Alpha Cnc, 65 Cancri, 65 Cnc, BD+12 1948, FK5 337, GC 12406, HD 76756, HIP 44066, HR 3572, SAO 98267, PPM 125972, ADS 7115 A, CCDM J08585+1151A | |
| Database references | |
| SIMBAD | data |
| B | |
Alpha Cancri is a star system in the northern constellation of Cancer. Its name is a Bayer designation that is Latinized from α Cancri, and abbreviated Alpha Cnc or α Cnc. The primary component has the proper name Acubens, pronounced /ˈækjuːbɛnz/. It forms a fourth-magnitude star with an apparent magnitude of 4.20, making it barely visible to the naked eye under good viewing conditions. Based on parallax measurements, it is located at a distance of 178 light-years (55 pc) from the Sun, but is drifting closer with a radial velocity of −12 km/s. Since it is near the ecliptic, it can be occulted by the Moon.