Astronomy:70 Cancri
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Short description: Star in the constellation Cancer
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 09h 04m 09.86704s[1] |
| Declination | +27° 53′ 53.9089″[1] |
| Apparent magnitude (V) | 6.665[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A1V[3] |
| U−B color index | +0.05[4] |
| B−V color index | +0.00[4] |
| Astrometry | |
| Radial velocity (Rv) | −21.0±4.4[5] km/s |
| Proper motion (μ) | RA: −1.287[1] mas/yr Dec.: −1.429[1] mas/yr |
| Parallax (π) | 5.6109 ± 0.1390[1] mas |
| Distance | 580 ± 10 ly (178 ± 4 pc) |
| Absolute magnitude (MV) | 0.24[6] |
| Details | |
| Radius | 2.7[7] R☉ |
| Luminosity | 75.57[6] L☉ |
| Temperature | 8,887+352 −376[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
70 Cancri is a star in the zodiac constellation of Cancer, located around 580 light years from the Sun.[1] It is a challenge to view with the naked eye even under good seeing conditions, having an apparent visual magnitude of 6.7.[2] The star is moving closer to the Earth with a heliocentric radial velocity of -21 km/s,[5] and is expected to come to within 44 light-years in around nine million years.[6] It is an A-type main-sequence star[3] with a stellar classification of A1V.[3] The object has a radius of about 2.7 R☉[7] and is radiating 76[6] times the Sun's luminosity from its photosphere at an effective temperature of 8,887 K.[1]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 3.2 Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal 74: 375–406. doi:10.1086/110819. Bibcode: 1969AJ.....74..375C.
- ↑ 4.0 4.1 Osawa, Kiyoteru (1959). "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of A0 V Stars". Astrophysical Journal 130: 159. doi:10.1086/146706. Bibcode: 1959ApJ...130..159O.
- ↑ 5.0 5.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 6.0 6.1 6.2 6.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics 367 (2): 521–24. doi:10.1051/0004-6361:20000451. Bibcode: 2001A&A...367..521P.
- ↑ "70 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=70+Cnc.
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