| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Tucana |
| Right ascension | 23h 31m 20.339s |
| Declination | -58° 12′ 35.04″ |
| Apparent magnitude (V) | +7.82 |
| Absolute magnitude (V) | +4.20 |
| Distance | 172.5 ly (52.9 pc) |
| Spectral type | F7V |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia |
data |
HD 221287 is a yellow-white main-sequence star approximately 173 light years away in the constellation of Tucana. It has an apparent magnitude of 7.82 and absolute magnitude of 4.20. This star is also named HIP 116084.
On March 5, 2007, the astronomer Dominique Naef used the HARPS spectrograph to uncover HD 221287 b (among others).[1] Using the amplitude from observations with HARPS, he calculated a minimum mass of 3.12 times that of Jupiter, making this a superjovian. This planet orbits 25% further from the star than Earth to the Sun with a low eccentricity.
Stability analysis reveals that the orbits of Earth sized planets in HD 221287 b's Trojan points, located 60 degrees ahead and behind the planet in its orbit, would be stable for long periods of time.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | >3.09 ± 0.79 MJ | 1.25 ± 0.04 | 456.1 ± 6.5 | 0.08 ± 0.11 |