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70 Cancri

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Star in the constellation Cancer
70 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 09 04 09.86704
Declination +27° 53′ 53.9089″
Apparent magnitude (V) 6.665
Characteristics
Evolutionary stage main sequence
Spectral type A1V
U−B color index +0.05
B−V color index +0.00
Astrometry
Radial velocity (Rv)−21.0±4.4 km/s
Proper motion (μ) RA: −1.287 mas/yr
Dec.: −1.429 mas/yr
Parallax (π)5.6109 ± 0.1390 mas
Distance580 ± 10 ly
(178 ± 4 pc)
Absolute magnitude (MV)0.24
Details
Radius2.7 R
Luminosity75.57 L
Temperature8,887+352
−376 K
Other designations
70 Cnc, BD+28°1683, HD 77557, HIP 44512, HR 3601, SAO 80609
Database references
SIMBADdata

70 Cancri is a star in the zodiac constellation of Cancer, located around 580 light years from the Sun. It is a challenge to view with the naked eye even under good seeing conditions, having an apparent visual magnitude of 6.7. The star is moving closer to the Earth with a heliocentric radial velocity of -21 km/s, and is expected to come to within 44 light-years in around nine million years. It is an A-type main-sequence star with a stellar classification of A1V. The object has a radius of about 2.7 R and is radiating 76 times the Sun's luminosity from its photosphere at an effective temperature of 8,887 K.

References

  1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H.
  3. ^ 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. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
  4. ^ Osawa, Kiyoteru (1959). "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of A0 V Stars". Astrophysical Journal. 130: 159. Bibcode:1959ApJ...130..159O. doi:10.1086/146706.
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  6. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  7. ^ 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. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
  8. "70 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-09.
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