HD 208177 is a double star system in the equatorial constellation of Aquarius.[5] They are faintly visible to the naked eye with an apparent magnitude of 6.20.[2] The pair have an angular separation of 19.113″.[7] The primary component is an evolved subgiant star with a stellar classification of F5IV.[3] It has an estimated 163%[5] of the Sun's mass and is about 1.7 billion years old[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 54m 35.91630s[1] |
| Declination | −03° 18′ 04.5532″[1] |
| Apparent magnitude (V) | 6.20[2] |
| Characteristics | |
| Spectral type | F5IV[3] |
| U−B color index | 0.07[2] |
| B−V color index | 0.48[2] |
| Astrometry | |
| Radial velocity (Rv) | -20[4] km/s |
| Proper motion (μ) | RA: +29.06[1] mas/yr Dec.: −29.87[1] mas/yr |
| Parallax (π) | 16.89 ± 1.32 mas[1] |
| Distance | 190 ± 20 ly (59 ± 5 pc) |
| Details | |
| Mass | 1.63[5] M☉ |
| Surface gravity (log g) | 3.94[6] cgs |
| Temperature | 6,577[6] K |
| Metallicity [Fe/H] | 0.30[6] dex |
| Age | 1.70[6] Gyr |
| Mass | 0.32[5] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |