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,[2] 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.[3] Parallax measurements place this star about 1,000 light years away from the solar system.[1]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 23h 30m 07.4133s[1] |
Declination | +49° 07′ 59.3232″[1] |
Apparent magnitude (V) | 6.17[2] |
Characteristics | |
Spectral type | K3III[3] |
U−B color index | 1.71[2] |
B−V color index | 1.46[2] |
Astrometry | |
Radial velocity (Rv) | −8.41±0.15[4] km/s |
Proper motion (μ) | RA: 28.741±0.100[1] mas/yr Dec.: 3.180±0.087[1] mas/yr |
Parallax (π) | 3.2290 ± 0.0642 mas[1] |
Distance | 1,010 ± 20 ly (310 ± 6 pc) |
Details | |
Radius | 48[5] R☉ |
Surface gravity (log g) | 2.32[6] cgs |
Temperature | 4228±125[6] K |
Metallicity [Fe/H] | −0.24±0.10[6] dex |
Other designations | |
Database references | |
SIMBAD | data |