RS Canum Venaticorum
RS Canum Venaticorum is a binary star system in the northern constellation of Canes Venatici. It serves as the prototype to the class of RS Canum Venaticorum variables. The peak apparent visual magnitude of this system is below the level needed to observe it with the naked eye. It is located at a distance of approximately 443 light years from the Sun based on parallax, but is drifting closer with a net radial velocity of −14 km/s. Olin J. Eggen (1991) included this system as a member of the IC 2391 supercluster, but it was later excluded.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Canes Venatici |
| Right ascension | 13h 10m 36.908s |
| Declination | +35° 56′ 05.58″ |
| Apparent magnitude (V) | 7.93 to 9.14 (secondary: 8.19) |
| Characteristics | |
| A | |
| Evolutionary stage | Main-sequence |
| Spectral type | F6IV or F5V |
| B−V color index | 0.46 |
| B | |
| Evolutionary stage | Subgiant |
| Spectral type | G8IV or K2IV |
| B−V color index | 0.91 |
| Variable type | Algol and RS CVn |
| Astrometry | |
| Radial velocity (Rv) | −13.62±0.44 km/s |
| Proper motion (μ) | RA: −49.898 mas/yr Dec.: +20.754 mas/yr |
| Parallax (π) | 7.3486 ± 0.0225 mas |
| Distance | 444 ± 1 ly (136.1 ± 0.4 pc) |
| Absolute magnitude (MV) | 2.95 |
| Orbit | |
| Period (P) | 4.797695 d |
| Eccentricity (e) | 0.00 |
| Inclination (i) | 85.55° |
| Periastron epoch (T) | 2,448,379.1993 HJD |
| Semi-amplitude (K1) (primary) | 90.2±0.1 km/s |
| Semi-amplitude (K2) (secondary) | 84.3 km/s |
| Details | |
| A | |
| Mass | 1.44 M☉ |
| Radius | 2.1 R☉ |
| Temperature | 6,800 K |
| Rotation | 8.542 d |
| Rotational velocity (v sin i) | 11±2 km/s |
| Age | 2.5 Gyr |
| B | |
| Mass | 1.31 M☉ |
| Radius | 4.3 R☉ |
| Temperature | 4,580 K |
| Rotational velocity (v sin i) | 42±3 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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