70 Cancri

From Wikipedia, the free encyclopedia
Jump to: navigation, search
70 Cancri
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
Right ascension 09h 04m 09.86833s[1]
Declination +27° 53′ 53.8989″[1]
Apparent magnitude (V) 6.665[2]
Characteristics
Spectral type A1V[3]
U−B color index +0.05[4]
B−V color index +0.00[4]
Astrometry
Radial velocity (Rv) -21.00 ± 4.4[5] km/s
Proper motion (μ) RA: 0.67[1] mas/yr
Dec.: -1.78[1] mas/yr
Parallax (π) 5.12 ± 0.49[1] mas
Distance 640 ± 60 ly
(200 ± 20 pc)
Details
Radius 2.7[6] R
Other designations
BD+28° 1683, HD 77557, HIP 44512, HR 3601, SAO 80609
Database references
SIMBAD data

70 Cancri (70 Cnc) is a star in the constellation Cancer. Its apparent magnitude is 6.665,[2] and it is an A-type main-sequence star[3] with a radius of about 2.7 R.[6]

References[edit]

  1. ^ a b c d e van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357. 
  2. ^ a b 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. ^ a b 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. ^ a b 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. Bibcode:2006AstL...32..759G. arXiv:1606.08053Freely accessible. doi:10.1134/S1063773706110065. 
  6. ^ a b 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: 521–24. Bibcode:2001A&A...367..521P. arXiv:astro-ph/0012289Freely accessible. doi:10.1051/0004-6361:20000451.