24 Cancri

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24 Cancri
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
24 Cnc A
Right ascension 08h 26m 39.792s[1]
Declination +24° 32′ 03.01″[1]
Apparent magnitude (V) 6.91[2]
24 Cnc B
Right ascension 08h 26m 40.06s[3]
Declination +24° 32′ 06.6″[3]
Apparent magnitude (V) 7.81[3]
Characteristics
Spectral type F0III[2] / F7V[3]
U−B color index +0.06[4]
B−V color index +0.30[4]
Astrometry
Radial velocity (Rv)15.4 ± 3.0[5] km/s
Proper motion (μ) RA: -41.50[6] mas/yr
Dec.: -79.51[6] mas/yr
Parallax (π)12.54 ± 0.94[6] mas
Distance260 ± 20 ly
(80 ± 6 pc)
Orbit[7]
Period (P)21.78 ± 0.20 yr
Semi-major axis (a)0.149 ± 0.001″
Eccentricity (e)0.079 ± 0.009
Inclination (i)19.1 ± 1.0°
Longitude of the node (Ω)153.6 ± 5.0°
Periastron epoch (T)B 1998.42 ± 0.30
Argument of periastron (ω)
(secondary)		51.0 ± 10.0°
Other designations
24 Cnc, ADS 6811 AB, CCDM J08267+2432AB
24 Cnc A: BD+25° 1920, HD 71152, HIP 41389, HR 3312, SAO 80184
24 Cnc B: HD 71153, HR 3313, SAO 80185
Database references
SIMBAD24 Cnc
24 Cnc A
24 Cnc B

24 Cancri (abbreviated to 24 Cnc) is a triple star system in the constellation Cancer. The system is located about 260 light-years (80 parsecs) away, based on its parallax.[6] The system has a combined apparent magnitude of 6.91.[2]

The primary component in the star system is designated 24 Cancri A. It is a F-type giant star. The secondary component, designated 24 Cancri B, is a F-type main-sequence star. It itself is a binary, with an orbital period of about 22 years.[7]

References[]

  1. ^ 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.
  2. ^ a b c "HR 3312". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 June 2017.
  3. ^ a b c d "* 24 Cnc B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 June 2017.
  4. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  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. ^ a b c d van Leeuwen, F.; et al. (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. S2CID 18759600. Archived from the original on 2016-04-02.
  7. ^ a b Docobo, J. A.; Ling, J. F. (2009). "Binary Stars with Components of Solar Type: 25 Orbits and System Masses". The Astronomical Journal. 138 (4): 1159. Bibcode:2009AJ....138.1159D. doi:10.1088/0004-6256/138/4/1159.


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