20 Canum Venaticorum is a single[11] variable star in the northern constellation of Canes Venatici, located 238 light years from the Sun. This object has the variable star designation AO Canum Venaticorum; 20 Canum Venaticorum is the Flamsteed designation. It is visible to the naked eye as a faint, white-hued star with a baseline apparent visual magnitude of +4.72.[3] The star is moving further from the Earth with a heliocentric radial velocity of +9 km/s.[6] Eggen (1971) listed this star as a member of the Hyades Stream.[12]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Canes Venatici |
Right ascension | 13h 17m 32.54093s[2] |
Declination | +40° 34′ 21.3875″[2] |
Apparent magnitude (V) | +4.715[3] |
Characteristics | |
Spectral type | A9 II mF2[4] |
B−V color index | 0.30[3] |
Variable type | δ Sct[5] |
Astrometry | |
Radial velocity (Rv) | 9.32±0.16[6] km/s |
Proper motion (μ) | RA: −113.761[2] mas/yr Dec.: +19.858[2] mas/yr |
Parallax (π) | 13.7210 ± 0.1581 mas[2] |
Distance | 238 ± 3 ly (72.9 ± 0.8 pc) |
Details | |
Mass | 2.43[3] M☉ |
Radius | 4[7] R☉ |
Luminosity | 63[3] L☉ |
Surface gravity (log g) | 2.97[8] cgs |
Temperature | 7,314±42[3] K |
Metallicity [Fe/H] | 0.18[7] dex |
Rotational velocity (v sin i) | 15[9] km/s |
Age | 750[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This star has a stellar classification of A9 II mF2, which indicates the hydrogen line matches an A-type bright giant but the metal lines are closer to an F-type star. However, it does not appear to be an Am star as the Calcium K line is normal.[4] Earlier, Morgan and Abt (1972) assigned it a giant star class of F3 III.[13] It is classified as a Delta Scuti type variable star with a single radial pulsation mode providing the best fit to the observed variation.[5] Its brightness varies from magnitude +4.70 to +4.75 with a period of 2.92 hours.[14]
20 Canum Venaticorum is 750[3] million years old with 2.43[3] times the mass of the Sun and 4[7] time the Sun's radius. It is radiating 63[3] times the Sun's luminosity from its photosphere at an effective temperature of 7,314 K.[3]