24 Canum Venaticorum
Star in the constellation Canes Venatici
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24 Canum Venaticorum is a single[9] star in the northern constellation of Canes Venatici, located 277 light years away from the Sun.[1] This object is visible to the naked eye as a faint white-hued star with an apparent visual magnitude of +4.68.[2] It is moving closer to the Earth with a heliocentric radial velocity of −18 km/s.[4]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Canes Venatici |
| Right ascension | 13h 34m 27.25928s[1] |
| Declination | +49° 00′ 57.5065″[1] |
| Apparent magnitude (V) | +4.68[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A5V |
| B−V color index | 0.132±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | −18.3±2.8[4] km/s |
| Proper motion (μ) | RA: −128.38[1] mas/yr Dec.: +28.05[1] mas/yr |
| Parallax (π) | 18.09±0.19 mas[1] |
| Distance | 180 ± 2 ly (55.3 ± 0.6 pc) |
| Absolute magnitude (MV) | 0.85[5] |
| Details | |
| Mass | 1.74[6] M☉ |
| Radius | 1.90[7] R☉ |
| Luminosity | 40.8+1.1 −1.0[3] L☉ |
| Surface gravity (log g) | 3.97[6] cgs |
| Temperature | 8,285±282[6] K |
| Rotational velocity (v sin i) | 159[3] km/s |
| Age | 310[6] Myr |
| Other designations | |
| 24 CVn, BD+49°2227, FK5 3083, GC 18356, HD 118232, HIP 66234, HR 5112, SAO 44668[8] | |
| Database references | |
| SIMBAD | data |
This is an A-type main-sequence star with a stellar classification of A4 V,[10] and it is a shell star with rotationally-broadened lines.[11] It is 310[6] million years old with a projected rotational velocity of 159 km/s.[3] This rate of spin is giving the star an oblate shape with an equatorial bulge that is 7% larger than the polar radius.[12] The star has 1.74[6] times the mass of the Sun and 1.9[7] times the Sun's radius. It is radiating 41[3] times the Sun's luminosity from its photosphere at an effective temperature of 8,285 K.[6]
24 Canum Venaticorum displays a significant infrared excess at wavelengths of 24μm and 70μm, indicating an orbiting circumstellar debris disk.[11] The signature matches a black body temperature of 464 K for an estimated orbital radius of 1.4 AU.[7]