Astronomy:24 Cancri
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Short description: Triple star system in the constellation Cancer
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000]] [[Astronomy:Equinox (celestial coordinates)|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[1] mas |
| Distance | 226.0 ± 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 | |
| Mass | 1.5 M☉ |
| Radius | 1.6 R☉ |
| Luminosity | 6.3 L☉ |
| Surface gravity (log g) | 4.17 cgs |
| Temperature | 7,331 K |
| Metallicity [Fe/H] | −0.49 dex |
| Age | 770 Myr |
| Other designations | |
| 24 Cnc A: {{{names1}}} | |
| 24 Cnc B: {{{names2}}} | |
| Database references | |
| SIMBAD | 24 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Abt, H. A. (1981). "Visual multiples. VII - MK classifications". The Astrophysical Journal Supplement Series 45: 437. doi:10.1086/190719. Bibcode: 1981ApJS...45..437A.
- ↑ 5.0 5.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 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. doi:10.1088/0004-6256/138/4/1159. Bibcode: 2009AJ....138.1159D.
- ↑ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series (Noordwijk, Netherlands: ESA Publications Division) 1200. ISBN 9290923997. Bibcode: 1997ESASP1200.....E.
- ↑ 9.0 9.1 Tokovinin, Andrei (2018-03-01). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series 235 (1): 6. doi:10.3847/1538-4365/aaa1a5. ISSN 0067-0049. Bibcode: 2018ApJS..235....6T.
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