Delta Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 44m 41.099s |
| Declination | +18° 09′ 15.51″ |
| Apparent magnitude (V) | +3.94 |
| Characteristics | |
| Evolutionary stage | red clump |
| Spectral type | K0 III |
| U−B color index | +0.99 |
| B−V color index | +1.08 |
| Astrometry | |
| Radial velocity (Rv) | 16.39±0.25 km/s |
| Proper motion (μ) | RA: −18.435 mas/yr Dec.: −227.813 mas/yr |
| Parallax (π) | 23.8271±0.1853 mas |
| Distance | 137 ± 1 ly (42.0 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.843 |
| Details | |
| Mass | 1.71 M☉ |
| Radius | 11.7±0.13 R☉ |
| Luminosity | 59.5±1.4 L☉ |
| Surface gravity (log g) | 2.59 cgs |
| Temperature | 4,684±27 K |
| Metallicity [Fe/H] | −0.03 dex |
| Rotational velocity (v sin i) | 2.8 km/s |
| Age | 2.45 Gyr |
| Other designations | |
| Asellus Australis, δ Cnc, 47 Cnc, BD+18°2027, FK5 326, GC 12022, HD 74442, HIP 42911, HR 3461, SAO 98087, ADS 6967, CCDM 08447+1809 | |
| Database references | |
| SIMBAD | data |
Delta Cancri is a star in the constellation of Cancer. It has the proper name Asellus Australis, Delta Cancri is its Bayer designation. This star is visible to the naked eye with an apparent visual magnitude of +3.94. Based on parallax measurements, it is located at a distance of 137 light-years (42 pc) from Earth. It is drifting further away with a line of sight velocity of 16 km/s.
The star is 0.08 degree north of the ecliptic, so it can be occulted by the Moon and more rarely by planets; it is occulted (eclipsed) by the sun from about 31 July to 2 August. Thus the star can be viewed the whole night, crossing the sky at the start of February.