OY Carinae
| Observation data Epoch {{{epoch}}} Equinox |
|
|---|---|
| Constellation | Carina |
| Right ascension | 10h 06m 22.07s |
| Declination | −70° 14′ 04.6″ |
| Apparent magnitude (V) | +12.2 |
| Characteristics | |
| Spectral type | DA / M6V |
| Astrometry | |
| Distance | 277.1 ly (85[1] pc) |
| Details | |
| Mass | ≈0.7[1]/0.07[2] M☉ |
| Radius | 0.011[1]/0.127[2] R☉ |
| Luminosity | 0.0055/0.00117 L☉ |
| Temperature | 15,000/3,000 K |
| Orbit | |
| Period (P) | 0.000172 yr |
| Semi-major axis (a) | 0.00213 Astronomical Units" |
| Eccentricity (e) | 0.0 |
| Inclination (i) | 83.3° |
| Other designations | |
|
OY Car, RX J1006.5-7014, SON 6302, 2MASS J10062206-7014045, SBC9 600, AAVSO 1004-69
|
|
| Database references | |
| SIMBAD | data |
OY Carinae (abbreviated OY Car) is an eclipsing binary system approximately 277 light-years away from the Sun, classed as cataclysmic variable. The system comprises an eclipsing white dwarf and red dwarf that orbit each other every 1.51 hours, and possibly a yet unconfirmed third low-mass (substellar?) companion.
Planetary system?
Greenhill et al. (2009) would invoke the presence of a third object to explain orbital period variations with an apparent periodicity of roughly 35 years. The third body could yield a minimum mass 7 times greater than Jupiter and be located 9.5 Astronomical Units away from the cataclysmic variable system,[3] being likely either a massive planetary object or else a very low-mass brown dwarf. It is likely that the apparent change is due to solar-cycle type magnetic activity in the secondary star. Large irregular deviations from the general trend, with time-scales of years, also occur. Further observations will be able to confirm either discard the presence of a substellar companion.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (unconfirmed) | ≥7 MJ | 9.5 | 35±3.5 | ? | — | — |
