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Delta Cancri
Orange giant star in the constellation Cancer / From Wikipedia, the free encyclopedia
Delta Cancri (δ Cancri, abbreviated Delta Cnc, δ Cnc) is a double star about 140 light-years from the Sun in the constellation of Cancer.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cancer |
Right ascension | 08h 44m 41.099s[1] |
Declination | +18° 09′ 15.509″[1] |
Apparent magnitude (V) | +3.94[2] |
Characteristics | |
Spectral type | K0 III[3] |
U−B color index | +0.99[2] |
B−V color index | +1.08[2] |
Astrometry | |
Radial velocity (Rv) | 16.39±0.25[4] km/s |
Proper motion (μ) | RA: −18.435 mas/yr[1] Dec.: −227.813 mas/yr[1] |
Parallax (π) | 23.8271 ± 0.1853 mas[1] |
Distance | 137 ± 1 ly (42.0 ± 0.3 pc)[1] |
Absolute magnitude (MV) | +0.843[5] |
Details | |
Mass | 1.71[3] M☉ |
Radius | 11.7±0.13[6] R☉ |
Luminosity | 59.5±1.4[6] L☉ |
Surface gravity (log g) | 2.59[6] cgs |
Temperature | 4684±27[6] K |
Metallicity [Fe/H] | −0.03[6] dex |
Rotational velocity (v sin i) | 2.8[4] km/s |
Age | 2.45[3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Close
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)[7] 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.[8] Thus the star can be viewed the whole night, crossing the sky at the start of February.