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]
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]