Upsilon1 Cancri

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Upsilon1 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension  08h 31m 30.51925s[1]
Declination +24° 04′ 51.9890″[1]
Apparent magnitude (V) +5.694[2]
Spectral type F0 IIIn[3]
B−V color index +0.309[2]
Radial velocity (Rv)+19.0±4.3[4] km/s
Proper motion (μ) RA: −81.36[1] mas/yr
Dec.: −44.57[1] mas/yr
Parallax (π)13.05 ± 0.29[1] mas
Distance250 ± 6 ly
(77 ± 2 pc)
Absolute magnitude (MV)+1.29[5]
Mass1.47[6] M
Luminosity25[5] L
Surface gravity (log g)3.51[7] cgs
Temperature7,240±246[6] K
Rotational velocity (v sin i)109.2[7] km/s
Age570[6] Myr
Other designations
υ1 Cnc, 30 Cancri, BD+24° 1940, FK5 2666, HD 72041, HIP 41816, HR 3355, SAO 80229[8]
Database references

Upsilon1 Cancri, Latinized from υ1 Cancri, is the Bayer designation for a solitary,[3] yellow-white hued star in the constellation Cancer, it is faintly visible with the naked eye, having an apparent visual magnitude of +5.7.[2] Based upon an annual parallax shift of 13.05 mas as seen from Earth,[1] this system is roughly 250 light years from the Sun.

This object has a stellar classification of F0 IIIn, indicating it is an F-type giant star;[3] the 'n' suffix indicates "nebulous" absorption lines due to rapid rotation, and it shows a relatively high projected rotational velocity of 109.2 km/s.[7] It is a variable star of unknown type that varies in brightness with an amplitude of 0.05 magnitude.[9] The star is about 570[6] million years old and it has an estimated mass of 1.47[6] times the mass of the Sun. On average, it is radiating 25[5] times the Sun's luminosity from its photosphere at an effective temperature of 7,240 K.[6]


  1. ^ a b c d e f 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.
  2. ^ a b c Høg, E.; et al. (March 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862.
  3. ^ a b c 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.
  4. ^ 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.
  5. ^ a b c 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.
  6. ^ a b c d e f David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  7. ^ a b c Schröder, C.; et al. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377.
  8. ^ "ups01 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-10.
  9. ^ Adelman, S. J. (October 2000), "On the Variability of A3-F0 Luminosity Class III-V Stars", Information Bulletin on Variable Stars (4969): 1, Bibcode:2000IBVS.4969....1A.