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 | subgiant |
| Spectral type | G0 |
| 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) |
| Absolute magnitude (MV) | +3.66 |
| Details | |
| Mass | 1.0±0.1 M☉ |
| Radius | 1.8±0.1 R☉ |
| Luminosity | 3.2±0.1 L☉ |
| Surface gravity (log g) | 3.93±0.08 cgs |
| Temperature | 5,741±133 K |
| Metallicity [Fe/H] | −0.22±0.04 dex |
| Rotation | 10.08 days |
| Rotational velocity (v sin i) | 3.8 km/s |
| Age | 8.0±0.4 Gyr |
| Other designations | |
| BD+48 4112, Gaia DR2 1943363751009454976, HD 222155, HIP 116616, SAO 53211, TYC 3646-2286-1, 2MASS J23380027+4859475 | |
| Database references | |
| SIMBAD | data |
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.
This is a G-type star with a stellar classification of G0. It has exhausted the hydrogen fuel in its core and begun to evolve towards a red giant; it is currently on the subgiant branch. It has begun to expand its gaseous envelope, having a radius of 1.8 R☉ with a mass almost the same as the Sun's The star is relatively depleted of heavy elements, having about 80% of solar abundance, and has weak yet noticeable ultraviolet flare activity.