Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Coma Berenices |
A | |
Right ascension | 12h 35m 07.76130s[1] |
Declination | +18° 22′ 37.4133″[1] |
Apparent magnitude (V) | 5.03[2] |
B | |
Right ascension | 12h 35m 06.34558s[1] |
Declination | +18° 22′ 37.5320″[1] |
Apparent magnitude (V) | 6.57[2] |
Characteristics | |
A | |
Spectral type | K0II-III[3] |
B−V color index | 1.152±0.018[2] |
B | |
Evolutionary stage | A9V[3] |
B−V color index | 0.265±0.015[2] |
Astrometry | |
A | |
Radial velocity (Rv) | +3.03±0.10[2] km/s |
Proper motion (μ) | RA: −3.719[1] mas/yr Dec.: +23.106[1] mas/yr |
Parallax (π) | 8.5745 ± 0.1996 mas[1] |
Distance | 380 ± 9 ly (117 ± 3 pc) |
Absolute magnitude (MV) | 0.30[4] |
B | |
Radial velocity (Rv) | +4.90±0.50[2] km/s |
Proper motion (μ) | RA: −2.320[1] mas/yr Dec.: +21.236[1] mas/yr |
Parallax (π) | 8.8346 ± 0.0695 mas[1] |
Distance | 369 ± 3 ly (113.2 ± 0.9 pc) |
Orbit[5] | |
Primary | Ba |
Companion | Bb |
Period (P) | 7.336673±0.000087 d |
Semi-major axis (a) | 1.007±0.037 mas |
Eccentricity (e) | 0.2585±0.0012 |
Inclination (i) | 61.40±3.89° |
Longitude of the node (Ω) | 136.17±2.86° |
Periastron epoch (T) | 2,459,361.967±0.011 JD |
Argument of periastron (ω) (primary) | 302.33±0.28° |
Semi-amplitude (K1) (primary) | 68.16±0.09 km/s |
Semi-amplitude (K2) (secondary) | 81.28±0.20 km/s |
Details | |
A | |
Mass | 4.40[6] M☉ |
Radius | 19.95+0.69 −2.58[1] R☉ |
Luminosity | 173.3±4.6[1] L☉ |
Surface gravity (log g) | 2.50[4] cgs |
Temperature | 4,688+337 −79[1] K |
Metallicity [Fe/H] | −0.09[7] dex |
B | |
Mass | 1.838/1.541[5] M☉ |
Radius | 2.28/1.70[5] R☉ |
Luminosity | 15.6/7.2[5] L☉ |
Surface gravity (log g) | 3.86/4.09[5] cgs |
Temperature | 7630/7180[5] K |
Metallicity [Fe/H] | 0.54[8] dex |
Rotational velocity (v sin i) | 14.5/14.2[5] km/s |
Other designations | |
A: NSV 5748, GC 17147, HD 109511, HIP 61418, HR 4792, SAO 100160[9] | |
B: GC 17146, HD 109510, HIP 61415, HR 4791, SAO 100159[10] | |
Database references | |
SIMBAD | A |
B |
24 Comae Berenices is a triple star system in the northern constellation of Coma Berenices. It is visible to the naked eye, with the brightest component being an orange-hued star with an apparent visual magnitude of 5.03.[2] The system is located at a distance of approximately 269 light-years from the Sun based on parallax, and is drifting further away with radial velocities of 3–5 km/s.[2]
This system can be resolved in a telescope as a pair of stars with an angular separation of 20.2″ along a position angle of 272°, as of 2018.[11] They share a common motion through space and thus appear to be physically associated,[12] with a wide projected separation of 1,400 AU or greater.[13] If they are bound in an orbit, the estimated period is approximately 28,000 years.[6]
The brighter member of this system is an aging giant or bright giant star with a stellar classification of K0II-III.[3] It has exhausted the supply of hydrogen at its core and expanded to 20[1] times the girth of the Sun. This is a suspected variable that has been recorded ranging in brightness from magnitude 4.98 down to 5.06.[14] The star is radiating 173[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,688 K.[1]
The fainter component at magnitude 6.57[2] is a double-lined spectroscopic binary with an orbital period of 7.33 days and an eccentricity of 0.26.[12] The primary member of this pair is an A-type main-sequence star with a stellar classification of A9V.[3] It is a metallic-lined Am star[15] with 2.2 times the radius of the Sun.[5] The stars radiate about 16 and 7 times the Sun's luminosity from its photosphere, respectively, at effective temperatures of 7,630 and 7180 K, respectively.[5] Both have relatively low projected rotational velocity of around 14 km/s,[5] and it is suspected the rotations of this binary system may be synchronized.[8] The system is a source for X-ray emission, which is most likely coming from the secondary.[16]
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