Theta Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 31m 35.72962s[1] |
| Declination | +18° 05′ 39.9160″[1] |
| Apparent magnitude (V) | +5.323[2] |
| Characteristics | |
| Spectral type | K5 III[3] |
| U−B color index | +1.949[2] |
| B−V color index | +1.565[2] |
| Astrometry | |
| Radial velocity (Rv) | +44.47±0.19[4] km/s |
| Proper motion (μ) | RA: −60.85[1] mas/yr Dec.: −56.14[1] mas/yr |
| Parallax (π) | 7.86 ± 0.29 mas[1] |
| Distance | 410 ± 20 ly (127 ± 5 pc) |
| Other designations | |
Theta Cancri (θ Cancri) is a binary star[6][3] system in the zodiac constellation of Cancer, 410 light years from Earth. The primary, component A, is classified as an orange K-type giant with an apparent magnitude of +5.32.[2] Since it is near the ecliptic, it can be occulted by the Moon[7] and, very rarely, by planets.
References
- ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
- ^ a b c d Gutierrez-Moreno, Adelina; et al. (1966), A System of photometric standards, vol. 1, Publicaciones Universidad de Chile, Department de Astronomy, pp. 1–17, Bibcode:1966PDAUC...1....1G.
- ^ a b Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
- ^ "tet Cnc -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-19.
- ^ Hartkopf, W. I.; McAlister, H. A. (January 1984), "Binary stars unresolved by speckle interferometry. III", Astronomical Society of the Pacific, Publications, 96: 105−116, Bibcode:1984PASP...96..105H, doi:10.1086/131309.
- ^ White, Nathaniel M.; Feierman, Barry H. (September 1987), "A Catalog of Stellar Angular Diameters Measured by Lunar Occultation", Astronomical Journal, 94: 751, Bibcode:1987AJ.....94..751W, doi:10.1086/114513.
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