R Canum Venaticorum
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canes Venatici |
| Right ascension | 13h 48m 57.0416s |
| Declination | +39° 32′ 33.174″ |
| Apparent magnitude (V) | 6.5 - 12.9 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | M5.5e-M9e |
| U−B color index | +0.41 |
| B−V color index | +1.22 |
| Variable type | Mira |
| Astrometry | |
| Radial velocity (Rv) | −6.80 km/s |
| Proper motion (μ) | RA: −1.115 mas/yr Dec.: −5.148 mas/yr |
| Parallax (π) | 2.1711±0.1262 mas |
| Distance | 1,500 ± 90 ly (460 ± 30 pc) |
| Details | |
| Mass | 2.26 M☉ |
| Radius | 664 R☉ |
| Luminosity | 29,251 L☉ |
| Surface gravity (log g) | 2.19 cgs |
| Temperature | 3,108 K |
| Metallicity [Fe/H] | −0.25 dex |
| Other designations | |
| R CVn, SAO 63763, GSC 03027-00252, BD+40°2694, HD 120499, DO 14814, GC 18671, HIP 67410, HR 5199 | |
| Database references | |
| SIMBAD | data |
R Canum Venaticorum is a Mira variable star in the constellation Canes Venatici. It ranges between magnitudes 6.5 and 12.9 over a period of approximately 329 days. It is too faint to be seen with the naked eye, but when it is near its maximum brightness it can be seen with binoculars.
Thomas E. Espin discovered this variable star in 1888. It appeared with its variable star designation, R Canum Venaticorum in Annie Jump Cannon's 1907 work Second Catalogue of Variable Stars.
Having exhausted its core helium, R Canum Venaticorum is on the asymptotic giant branch, producing energy from concentric hydrogen and helium shells.