| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 07m 09.634s[1] |
| Declination | +58° 50′ 26.58″[1] |
| Apparent magnitude (V) | 6.32[2] |
| Characteristics | |
| Spectral type | G8.6 III[3] |
| U−B color index | 0.63[2] |
| B−V color index | 0.88[2] |
| Astrometry | |
| Radial velocity (Rv) | −7.37±0.03[4] km/s |
| Proper motion (μ) | RA: −16.09±0.41[1] mas/yr Dec.: −22.30±0.41[1] mas/yr |
| Parallax (π) | 4.80 ± 0.46 mas[1] |
| Distance | 680 ± 70 ly (210 ± 20 pc) |
| Absolute magnitude (MV) | −0.3±0.2[4] |
| Orbit[4] | |
| Primary | HR 8442A |
| Companion | HR 8442B |
| Period (P) | 737.4±0.4 days |
| Eccentricity (e) | 0.308±0.007 |
| Periastron epoch (T) | 54113.3±2.1 |
| Argument of periastron (ω) (secondary) | 61.9±1.3° |
| Semi-amplitude (K1) (primary) | 5.55±0.04 km/s |
| Details | |
| Mass | 2.97[5] M☉ |
| Temperature | 5261±40[5] K |
| Age | 0.35[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HR 8442 is a spectroscopic binary star in the constellation Cepheus. The primary is a G type giant star while the secondary's spectral type is unknown.[4]
The spectroscopic binary nature of the star was first noticed by Jose Renan de Medeiros and Michel Mayor using radial velocity measurements from the Coravel spectrometer at Haute-Provence Observatory.[6] Roger Griffin then placed the star on his observing program at Cambridge Observatory leading to an orbital solution being published in 2015.[4]
van Leeuwen2007 was invoked but never defined (see the help page).Argue1966 was invoked but never defined (see the help page).Gray1989 was invoked but never defined (see the help page).Griffin2015 was invoked but never defined (see the help page).Luck2015 was invoked but never defined (see the help page).de Medeiros1999 was invoked but never defined (see the help page).