| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Tucana |
| Right ascension | 23h 31m 20.33819s[1] |
| Declination | −58° 12′ 35.0324″[1] |
| Apparent magnitude (V) | 7.82[2] |
| Characteristics | |
| Spectral type | F7V[3] |
| B−V color index | 0.513±0.008[2] |
| Astrometry | |
| Radial velocity (Rv) | −21.90±0.18[1] km/s |
| Proper motion (μ) | RA: 181.160±0.059[1] mas/yr Dec.: −5.297±0.060[1] mas/yr |
| Parallax (π) | 17.8529 ± 0.0402 mas[1] |
| Distance | 182.7 ± 0.4 ly (56.0 ± 0.1 pc) |
| Absolute magnitude (MV) | 4.11[2] |
| Details[4] | |
| Mass | 1.209+0.034 −0.038 M☉ |
| Radius | 1.183+0.020 −0.019 R☉ |
| Luminosity | 1.944+0.005 −0.007[1] 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[5] |
| Rotational velocity (v sin i) | 2.9±0.2 km/s |
| Age | 763+613 −474[4] or 1,300[5] Myr |
| Other designations | |
| 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.[2] 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.[1]
This object is an F-type main-sequence star with a stellar classification of F7V.[3] It is relatively young with age estimates of 763[4] 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.[5] The star is 18% larger and 20% more massive than the Sun.[4] It is radiating 1.9[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,440 K.[4]
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