HD 196885
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 39m 51.87484s |
| Declination | +11° 14′ 58.7002″ |
| Apparent magnitude (V) | 6.39 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | F8V + M1±1V |
| B−V color index | 0.559±0.006 |
| Astrometry | |
| Radial velocity (Rv) | −30.13±0.09 km/s |
| Proper motion (μ) | RA: +71.915 mas/yr Dec.: +89.318 mas/yr |
| Parallax (π) | 29.4076±0.0272 mas |
| Distance | 110.9 ± 0.1 ly (34.00 ± 0.03 pc) |
| Absolute magnitude (MV) | 3.76 |
| Orbit | |
| Primary | HD 196885 A |
| Name | HD 196886 B |
| Period (P) | 69.045+0.533 −0.111 yr |
| Semi-major axis (a) | 19.778+0.108 −0.019 AU |
| Eccentricity (e) | 0.417+0.001 −0.004 |
| Inclination (i) | 120.427° |
| Longitude of the node (Ω) | 79.150° |
| Periastron epoch (T) | 1982.886 AD |
| Argument of periastron (ω) (secondary) | 231.464° |
| Details | |
| A | |
| Mass | 1.3±0.1 M☉ |
| Radius | 1.38±0.01 R☉ |
| Luminosity | 2.611±0.007 L☉ |
| Surface gravity (log g) | 4.28±0.03 cgs |
| Temperature | 6,267+18 −16 K |
| Metallicity [Fe/H] | +0.29±0.05 dex |
| Rotation | 15 days |
| Rotational velocity (v sin i) | 7.3±1.5 km/s |
| Age | 1.5—3.5 Gyr |
| B | |
| Mass | 0.45±0.01 M☉ |
| Radius | 0.57±0.04 R☉ |
| Surface gravity (log g) | 4.58±0.06 cgs |
| Temperature | 3,549+121 −124 K |
| Other designations | |
| BD+10°4351, GC 28784, HD 196885, HIP 101966, HR 7907, SAO 106360, WDS J20399+1115, GCRV 12946, GSC 01092-01778, 2MASS J20395188+1114588 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 196885 is a binary star system in the northern constellation of Delphinus. It comprises a pair of stars, HD 196885 A and HD 196885 B, on a 69-year eccentric orbit. The primary star has one known planet.