Xi Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 09h 09m 21.53325s[1] |
| Declination | +22° 02′ 43.6053″[1] |
| Apparent magnitude (V) | +5.15[2] (5.70 + 6.20)[3] |
| Characteristics | |
| Spectral type | G9 III Fe-1 CH-0.5 |
| U−B color index | +0.75[2] |
| B−V color index | +0.96[2] |
| Astrometry | |
| Radial velocity (Rv) | 7.7±0.3[4] km/s |
| Proper motion (μ) | RA: −1.00[1] mas/yr Dec.: −0.52[1] mas/yr |
| Parallax (π) | 8.74 ± 0.49[1] mas |
| Distance | 370 ± 20 ly (114 ± 6 pc) |
| Orbit[5][6] | |
| Period (P) | 1700.76 d |
| Semi-major axis (a) | 0.0105±0.0017[3]″ |
| Eccentricity (e) | 0.06 |
| Periastron epoch (T) | 2428876.86 ± 10.0 JD |
| Argument of periastron (ω) (secondary) | 301.1° |
| Semi-amplitude (K1) (primary) | 4.4 km/s |
| Details | |
| Luminosity | 118[7] L☉ |
| Temperature | 5,101[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Xi Cancri (ξ Cancri) is a spectroscopic binary star system in the zodiac constellation of Cancer. This star, along with λ Leo (Alterf), were the Persian Nahn, "the Nose", and the Coptic Piautos, "the Eye", both lunar asterisms.[9] Nahn was the title of this star in the catalogue of stars in Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars.[10]
This system is visible to the naked eye with an apparent visual magnitude of +5.15.[2] Based upon an annual parallax shift of 8.74 mas as seen from Earth,[1] this system is located roughly 370 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.135 due to interstellar dust.[3]
Xi Cancri is a single-lined spectroscopic binary star system with an orbital period of 4.66 years, an eccentricity of 0.06, and a semimajor axis of 0.01 arc seconds. The primary, component A, is a yellow G-type giant with an apparent magnitude of +5.70. Its companion, component B, is magnitude 6.20.[3]
References
- 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752
, doi:10.1051/0004-6361:20078357. - 1 2 3 4 Sturch, C. R.; Helfer, H. L. (November 1972), "UBVRI photometry of north galactic pole K giants. II", Astronomical Journal, 77: 726, Bibcode:1972AJ.....77..726S, doi:10.1086/111344.
- 1 2 3 4 Malkov, O. Yu.; et al. (2012), "Dynamical masses of a selected sample of orbital binaries", Astronomy & Astrophysics, 546: A69, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774.
- ↑ 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, Bibcode:2012A&A...546A..61D, arXiv:1208.3048 , doi:10.1051/0004-6361/201219219, A61.
- ↑ Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics, 424 (2): 727, Bibcode:2004A&A...424..727P, arXiv:astro-ph/0406573 , doi:10.1051/0004-6361:20041213.
- ↑ Jackson, E. S.; et al. (May 1957), "The Orbits of the Spectroscopic Binaries Omicron Tauri, Xi Cancri, and Mu Ursae Majories", Astrophysical Journal, 125: 712, Bibcode:1957ApJ...125..712J, doi:10.1086/146345.
- 1 2 McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037 , doi:10.1111/j.1365-2966.2012.21873.x.
- ↑ "ksi Cnc -- Spectroscopic binary", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-15.
- ↑ Allen, R. H. (1963), Star Names: Their Lore and Meaning (Reprint ed.), New York, NY: Dover Publications Inc., p. 114, ISBN 0-486-21079-0, retrieved 2010-12-12.
- ↑ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars (PDF), Jet Propulsion Laboratory, California Institute of Technology.