  | |
| 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 |
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.
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.
- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ a b c Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114, 88.
- ^ a b Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209
- ^ Soubiran, C.; et al. (March 2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788, S2CID 16602121.
- ^ a b c d e Baines, Ellyn K.; Armstrong, J. Thomas; Clark, James H.; Gorney, Jim; Hutter, Donald J.; Jorgensen, Anders M.; Kyte, Casey; Mozurkewich, David; Nisley, Ishara; Sanborn, Jason; Schmitt, Henrique R.; Belle, Gerard T. van (October 2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 162 (5): 198. arXiv:2211.09030. Bibcode:2021AJ....162..198B. doi:10.3847/1538-3881/ac2431. ISSN 1538-3881.
- ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.
- ^ In the Sky Earth astronomy reference utility showing the ecliptic and relevant date as at J2000 - present