Epsilon Cancri

ε Cancri
Location of ε Cancri (circled red)
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
ε Cnc A
Right ascension 08h 40m 27.01010s[1]
Declination 19° 32′ 41.3243″[1]
Apparent magnitude (V) 6.29[2]
HD 73711
Right ascension 08h 40m 18.09670s[3]
Declination 19° 31′ 55.1636″[3]
Apparent magnitude (V) 7.535[4]
Characteristics
ε Cnc A
Spectral type A5 III[5] (kA3hA5mF0)[6]
U−B color index +0.16[7]
B−V color index +0.17[7]
HD 73711
Spectral type F0III[8] (kA3hA5mF0)[9]
Astrometry
ε Cnc A
Radial velocity (Rv)+29.9±1.1[10] km/s
Proper motion (μ) RA: −36.293[1] mas/yr
Dec.: −12.133[1] mas/yr
Parallax (π)5.3836 ± 0.0474 mas[1]
Distance606 ± 5 ly
(186 ± 2 pc)
Absolute magnitude (MV)+0.00[2]
HD 73711
Proper motion (μ) RA: −36.251[3] mas/yr
Dec.: −12.118[3] mas/yr
Parallax (π)5.4103 ± 0.0308 mas[3]
Distance603 ± 3 ly
(185 ± 1 pc)
Orbit[11]
Primaryε Cnc Aa
Companionε Cnc Ab
Period (P)35.14101±0.00005 d
Semi-major axis (a)1.9127±0.0004 mas
Eccentricity (e)0.4195±0.0003
Inclination (i)81.454±0.010°
Longitude of the node (Ω)356.069±0.014°
Periastron epoch (T)2448314.598 ± 0.016
Argument of periastron (ω)
(primary)		258.38±0.02°
Semi-amplitude (K1)
(primary)		56.60±0.03 km/s
Semi-amplitude (K2)
(secondary)		61.55±0.10 km/s
Details
ε Cnc Aa
Mass2.420[11] M☉
Radius4.8[4] R☉
Luminosity90[4] L☉
Surface gravity (log g)3.49[12] cgs
Temperature8,163[4] K
Metallicity [Fe/H]+0.10[12] dex
Rotational velocity (v sin i)49.2[13] km/s
Age637 ± 19[11] Myr
ε Cnc Ab
Mass2.226[11] M☉
HD 73711
Mass2.54[3] M☉
Radius2.4[3] R☉
Luminosity43.5[3] L☉
Surface gravity (log g)4.09[3] cgs
Temperature9,572[3] K
Metallicity [Fe/H]+0.79[3] dex
Rotational velocity (v sin i)56.3[8] km/s
Age407[3] Myr
Other designations
CCDM J08404+1932, WDS J08405+1933
ε Cancri: Meleph, ε Cnc, 41 Cancri, BD+20°2171, GC 11904, HD 73731, HIP 42556, HR 3429, SAO 98024, GSC 01395-02733
HD 73711: BD+20°2163, GC 11893, HD 73711, SAO 98018
Database references
SIMBADε Cancri
HD 73711

Epsilon Cancri (ε Cancri, abbreviated Epsilon Cnc, ε Cnc) is a white-hued binary star system in the zodiac constellation of Cancer. It is the brightest member of the Beehive Cluster[14] with an apparent visual magnitude of +6.29,[2] which is near the lower limit of visibility with the naked eye. The annual parallax shift of 5.4 mas as seen from Earth yields a distance estimate of approximately 606 light-years from the Sun.

The binary pair has the designation WDS J08405+1933. The primary star is designated Epsilon Cancri and the secondary is HD 73711. Epsilon Cancri is itself a spectroscopic binary with components designated Aa (also named Meleph[15]) and Ab. HD 73711 is also suspected of being a spectroscopic binary.[16]

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  2. ^ 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. S2CID 119257644. Vizier catalog entry
  3. ^ a b c d e f g h i j k l Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
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  5. ^ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  6. ^ Cite error: The named reference gray was invoked but never defined (see the help page).
  7. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  8. ^ a b Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G. 3244. Bibcode:2005yCat.3244....0G.
  9. ^ Abt, H. A. (1986). "MK classification of the brighter Praesepe stars". Publications of the Astronomical Society of the Pacific. 98: 307. Bibcode:1986PASP...98..307A. doi:10.1086/131757. S2CID 122099889.
  10. ^ 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. S2CID 59451347. A61.
  11. ^ a b c d Morales, Leslie M.; Sandquist, Eric L.; Schaefer, Gail H.; Farrington, Christopher D.; Klement, Robert; Bedin, Luigi R.; Libralato, Mattia; Malavolta, Luca; Nardiello, Domenico; Orosz, Jerome A.; Monnier, John D.; Kraus, Stefan; Le Bouquin, Jean-Baptiste; Anugu, Narsireddy; Ten Brummelaar, Theo; Davies, Claire L.; Ennis, Jacob; Gardner, Tyler; Lanthermann, Cyprien (2022). "The Interferometric Binary ε Cnc in Praesepe: Precise Masses and Age". The Astronomical Journal. 164 (2): 34. arXiv:2205.10690. Bibcode:2022AJ....164...34M. doi:10.3847/1538-3881/ac7329. S2CID 248986906.
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  13. ^ Paunzen, E.; et al. (February 2013). "A photometric study of chemically peculiar stars with the STEREO satellites - II. Non-magnetic chemically peculiar stars". Monthly Notices of the Royal Astronomical Society. 429 (1): 119–125. arXiv:1211.1535. Bibcode:2013MNRAS.429..119P. doi:10.1093/mnras/sts318.
  14. ^ Wang, J. J; Chen, L; Zhao, J. H; Jiang, P. F (1995). "High-precision study of proper motions and membership of 924 stars in the central region of Praesepe". Astronomy and Astrophysics Supplement. 113: 419. Bibcode:1995A&AS..113..419W.
  15. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.
  16. ^ Abt, Helmut A.; Willmarth, Daryl W. (1999). "Binaries in the Praesepe and Coma Star Clusters and Their Implications for Binary Evolution". The Astrophysical Journal. 521 (2): 682. Bibcode:1999ApJ...521..682A. doi:10.1086/307569. S2CID 119772785.