Delta Cancri
Delta Cancri (δ Cancri, abbreviated Delta Cnc, δ Cnc) is a double star about 180 light-years from the Sun in the constellation of Cancer.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 44m 41.09921s |
| Declination | +18° 09′ 15.5034″ |
| Apparent magnitude (V) | +3.94 |
| Characteristics | |
| 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: −17.67 mas/yr Dec.: −229.26 mas/yr |
| Parallax (π) | 24.98 ± 0.24 mas |
| Distance | 131 ± 1 ly (40.0 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.843 |
| Details | |
| Mass | 1.71 M☉ |
| Radius | 11 R☉ |
| Luminosity | 52 L☉ |
| Surface gravity (log g) | 2.7 cgs |
| Temperature | 4,637±27 K |
| Metallicity [Fe/H] | −0.13 dex |
| Rotational velocity (v sin i) | 2.8 km/s |
| Age | 2.45 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Its two main constituents are designated Delta Cancri A and B. A is itself a binary star whose components are Delta Cancri Aa (formally named Asellus Australis /əˈsɛləs ɔːsˈtreɪlɪs/, the traditional name of the entire system) and Ab.
The star system 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.
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