HD 222155
HD 222155 is a star in the northern constellation of Andromeda. It is a yellow star that can be viewed with binoculars or a small telescope, but is too faint to be seen with the naked eye at an apparent visual magnitude of 7.1. The imaging survey in 2017 did not detect any stellar companions to HD 222155.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 38m 00.30719s |
| Declination | +48° 59′ 47.4874″ |
| Apparent magnitude (V) | 7.1 |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | G0V |
| B−V color index | 0.64 |
| Astrometry | |
| Radial velocity (Rv) | −44.00±0.12 km/s |
| Proper motion (μ) | RA: 195.306 mas/yr Dec.: -117.335 mas/yr |
| Parallax (π) | 19.8020 ± 0.0160 mas |
| Distance | 164.7 ± 0.1 ly (50.50 ± 0.04 pc) |
| Details | |
| Mass | 1.21±0.10 M☉ |
| Radius | 1.85±0.04 R☉ |
| Luminosity | 3.2 L☉ |
| Surface gravity (log g) | 4.10±0.13 cgs |
| Temperature | 5720±44 K |
| Metallicity [Fe/H] | -0.11±0.05 dex |
| Rotational velocity (v sin i) | 3.2±1.0 km/s |
| Age | 8.2±0.7 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an old main sequence star with a stellar classification of G0V; a star that is nearing an exhaustion of its hydrogen fuel. It is already beginning to expand its gaseous envelope, having radius of 1.85R☉. The star is relatively depleted of heavy elements, having about 80% of solar abundance, and has weak yet noticeable ultraviolet flare activity.
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