HD 65216
HD 65216 is a triple star system with two exoplanetary companions in the southern constellation of Carina. With an apparent visual magnitude of 7.97 it cannot be readily seen without technical aid, but with binoculars or telescope it should be visible. The system is located at a distance of 114.7 light-years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 42.6 km/s.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Carina |
| Right ascension | 07h 53m 41.3193s |
| Declination | −63° 38′ 50.353″ |
| Apparent magnitude (V) | 7.97 |
| Characteristics | |
| Spectral type | G5V + M7–8 + L2–3 |
| B−V color index | 0.672±0.012 |
| Astrometry | |
| Radial velocity (Rv) | 42.57±0.16 km/s |
| Proper motion (μ) | RA: −123.633±0.065 mas/yr Dec.: 146.578±0.073 mas/yr |
| Parallax (π) | 28.4445 ± 0.0317 mas |
| Distance | 114.7 ± 0.1 ly (35.16 ± 0.04 pc) |
| Absolute magnitude (MV) | 5.22 |
| Details | |
| HD 65216 A | |
| Mass | 0.95±0.01 M☉ |
| Radius | 0.864±0.003 R☉ |
| Luminosity | 0.716±0.001 L☉ |
| Surface gravity (log g) | 4.53±0.01 cgs |
| Temperature | 5,718±8 K |
| Metallicity [Fe/H] | −0.17 dex |
| Rotational velocity (v sin i) | 1.308 km/s |
| Age | 1.7±0.5 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The primary, component A, is an ordinary G-type main-sequence star with a stellar classification of G5V. It is nearly two billion years old and is spinning with a projected rotational velocity of 1.3 km/s. The star has 95% of the mass and 86% of the radius of the Sun. It is radiating 72% of the luminosity of the Sun from its photosphere at an effective temperature of 5,718 K.
In 2008 a co-moving binary system of low mass companions were discovered at an angular separation of 7″ from the primary, which is equivalent to a projected separation of 253 AU at the distance of HD 65216. Component B is of class M7–8 (0.089 M☉) while component C is class L2–3 (0.078 M☉); both have a mass close to the sub-stellar limit. The pair have a projected separation of 6 AU from each other.