HD 221287
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Tucana |
| Right ascension | 23h 31m 20.33819s |
| Declination | −58° 12′ 35.0324″ |
| Apparent magnitude (V) | 7.82 |
| Characteristics | |
| Spectral type | F7V |
| B−V color index | 0.513±0.008 |
| Astrometry | |
| Radial velocity (Rv) | −21.90±0.18 km/s |
| Proper motion (μ) | RA: 181.160±0.059 mas/yr Dec.: −5.297±0.060 mas/yr |
| Parallax (π) | 17.8529±0.0402 mas |
| Distance | 182.7 ± 0.4 ly (56.0 ± 0.1 pc) |
| Absolute magnitude (MV) | 4.11 |
| Details | |
| Mass | 1.209+0.034 −0.038 M☉ |
| Radius | 1.183+0.020 −0.019 R☉ |
| Luminosity | 1.944+0.005 −0.007 L☉ |
| Surface gravity (log g) | 4.374±0.013 cgs |
| Temperature | 6,440±100 K |
| Metallicity [Fe/H] | +0.13±0.149 dex |
| Rotation | 5±2 |
| Rotational velocity (v sin i) | 2.9±0.2 km/s |
| Age | 763+613 −474 or 1,300 Myr |
| Other designations | |
| Poerava, CD−58°8579, HD 221287, HIP 116084, SAO 247912, TYC 8838-463-1, 2MASS J23312032-5812350 | |
| Database references | |
| SIMBAD | data |
HD 221287, named Poerava, is a star in the southern constellation of Tucana. It has a yellow-white hue but is too faint to be viewed with the naked eye, having an apparent visual magnitude of 7.82. This object is located at a distance of 183 light years from the Sun, as determined from its parallax. It is drifting closer with a radial velocity of −22 km/s.
This object is an F-type main-sequence star with a stellar classification of F7V. It is relatively young with age estimates of 763 million and 1.3 billion years, and possesses an active chromosphere. Cool spots on the surface are generating a radial-velocity signal that is modulated by the rotation period of around five days. The star is 18% larger and 20% more massive than the Sun. It is radiating 1.9 times the luminosity of the Sun from its photosphere at an effective temperature of 6,440 K.