24 Cancri
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
24 Cnc A
Right ascension 08h 26m 39.791s[1]
Declination +24° 32′ 03.02″[1]
Apparent magnitude (V) 6.89[2]
24 Cnc BC
Right ascension 08h 26m 40.068s[3]
Declination +24° 32′ 05.33″[3]
Apparent magnitude (V) 7.47[2]
Characteristics
Spectral type F0V / F7V[4]
U−B color index +0.06[5]
B−V color index +0.30[5]
Astrometry
Radial velocity (Rv)15.4±3.0[6] km/s
24 Cnc A
Proper motion (μ) RA: −43.008[1] mas/yr
Dec.: −78.521[1] mas/yr
Parallax (π)14.4288 ± 0.0238 mas[1]
Distance226.0 ± 0.4 ly
(69.3 ± 0.1 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°
Details[1]
24 Cnc A
Mass1.5 M☉
Radius1.6 R☉
Luminosity6.3 L☉
Surface gravity (log g)4.17 cgs
Temperature7,331 K
Metallicity [Fe/H]−0.49 dex
Age770 Myr
Other designations
24 Cnc, BD+25°1920, HIP 41389, ADS 6811 AB, CCDM J08267+2432AB
24 Cnc A: HD 71152, 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 226 light-years (69 parsecs) away, based on its parallax. The system has a combined apparent magnitude of 6.5,[8] and the two components A and B are separated by 5.7″.[9]

The primary component in the star system is designated 24 Cancri A. It is a F-type main sequence star.

The secondary component, designated 24 Cancri B, is also a F-type main-sequence star and is itself a binary with an orbital period of about 22 years.[7] The stars are identical, with apparent magnitudes of 8.6 and masses of 1.1 M☉, and they are separated by 0.15″.[9]

References

  1. ^ a b c d e f 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.
  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 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.
  4. ^ Abt, H. A. (1981). "Visual multiples. VII - MK classifications". The Astrophysical Journal Supplement Series. 45: 437. Bibcode:1981ApJS...45..437A. doi:10.1086/190719.
  5. ^ 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.
  6. ^ 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.
  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.
  8. ^ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series. 1200. Noordwijk, Netherlands: ESA Publications Division. Bibcode:1997ESASP1200.....E. ISBN 9290923997.
  9. ^ a b Tokovinin, Andrei (2018-03-01). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. ISSN 0067-0049. S2CID 119047709.
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