1 Cancri

1 Cancri
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Cancer
Right ascension	07h 56m 59.45230s[1]
Declination	+15° 47′ 25.0026″[1]
Apparent magnitude (V)	5.97[2]
Characteristics
Spectral type	K3− III[3]
B−V color index	1.285±0.007[4]
Astrometry
Radial velocity (Rv)	+13.93±0.15[1] km/s
Proper motion (μ)	RA: −26.794[1] mas/yr ; Dec.: −42.701[1] mas/yr
Parallax (π)	7.1899 ± 0.0958[1] mas
Distance	454 ± 6 ly ; (139 ± 2 pc)
Absolute magnitude (MV)	0.03[4]
Details
Radius	31[5] R☉
Luminosity	137[1] L☉
Temperature	4,367[1] K
Other designations
	1 Cnc, BD+16°1590, FK5 1208, HD 64960, HIP 38848, HR 3095, SAO 97399[6]
Database references
SIMBAD	data

1 Cancri is a single[2] star in the zodiac constellation of Cancer, positioned near the border with Gemini at a distance of around 470 light years from the Sun.[1] It is barely visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.97.[2] The object is moving further from the Earth with a heliocentric radial velocity of +14 km/s.[1]

This is an evolved giant star with a stellar classification of K3− III,[3] having exhausted the hydrogen at its core and expanded. It is specified as a spectral standard for that type.[3] The angular diameter of the star measured from a lunar occultation is 2.1±0.6 mas,[7] which, at its estimated distance, equates to a physical radius of about 31 times the radius of the Sun.[5] It is radiating 137[8] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,487 K.[8]

References

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.
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.
Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
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.
Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 978-3-540-29692-8. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 139\cdot 2.1)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 63\cdot R_{\bigodot }\end{aligned}}$
"1 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-22.
Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.

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[GaiaDR2-1] 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.

[Eggleton2008-2] 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.

[perkins1989-3] Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.

[Anderson2012-4] 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.

[lang2006-5] Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 978-3-540-29692-8. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 139\cdot 2.1)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 63\cdot R_{\bigodot }\end{aligned}}$

[SIMBAD-6] "1 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-22.

[Richichi2005-7] Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039

[Mcdonald2012-8] McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.