24 Cancri
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]
| 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 |
| Distance | 260 ± 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 A: BD+25° 1920, HD 71152, HIP 41389, HR 3312, SAO 80184 | |
| 24 Cnc B: HD 71153, HR 3313, SAO 80185 | |
| Database references | |
| SIMBAD | 24 Cnc |
| 24 Cnc A | |
| 24 Cnc B | |
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
- 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.
- "HR 3312". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 June 2017.
- "* 24 Cnc B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 June 2017.
- Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- 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.
- 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. Archived from the original on 2016-04-02.
- 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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