24 Cancri
Triple star system in the constellation Cancer
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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]
Apparentmagnitude(V)6.89[2]
Apparentmagnitude(V)7.47[2]
SpectraltypeF0V / F7V[4]
U−B color index+0.06[5]
| 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] |
| 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, 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 | |
| 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 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]