HD 221246
HD 221246 or NGC 7686 1 is a star in open cluster NGC 7686, and it belongs to the northern constellation of Andromeda. With an apparent visual magnitude of 6.17, it can be viewed by the naked eye only under very favourable conditions. It has a spectral classification of K3III, meaning it is an evolved orange giant star. Parallax measurements place this star about 1,000 light years away from the solar system.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 30m 07.4133s |
| Declination | +49° 07′ 59.3232″ |
| Apparent magnitude (V) | 6.17 |
| Characteristics | |
| Spectral type | K3III |
| U−B color index | 1.71 |
| B−V color index | 1.46 |
| Astrometry | |
| Radial velocity (Rv) | −8.41±0.15 km/s |
| Proper motion (μ) | RA: 28.741±0.100 mas/yr Dec.: 3.180±0.087 mas/yr |
| Parallax (π) | 3.2290 ± 0.0642 mas |
| Distance | 1,010 ± 20 ly (310 ± 6 pc) |
| Details | |
| Radius | 48 R☉ |
| Surface gravity (log g) | 2.32 cgs |
| Temperature | 4228±125 K |
| Metallicity [Fe/H] | −0.24±0.10 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
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