48 Cassiopeiae
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 02h 01m 57.450s[1] |
Declination | +70° 54′ 25.29″[1] |
Apparent magnitude (V) | +4.71/+6.41 |
Characteristics | |
Spectral type | A3IV |
U−B color index | +0.06 |
B−V color index | +0.16 |
Variable type | none |
Astrometry | |
Radial velocity (Rv) | −5 km/s |
Proper motion (μ) | RA: −55.69 ± 0.41[1] mas/yr Dec.: −8.71 ± 0.46[1] mas/yr |
Parallax (π) | 28.36 ± 0.44[1] mas |
Distance | 115 ± 2 ly (35.3 ± 0.5 pc) |
Absolute magnitude (MV) | +1.72 |
Orbit | |
Companion | 48 Cassiopeiae B |
Period (P) | 60.5 yr |
Semi-major axis (a) | 0.62" |
Eccentricity (e) | 0.36 |
Inclination (i) | 17° |
Longitude of the node (Ω) | 44° |
Periastron epoch (T) | 1965.00 |
Other designations | |
48 Cassiopeiae is a star system in the constellation Cassiopeia. It is approximately 115 light years from Earth.[1]
The primary component, 48 Cassiopeiae A, is a white A-type subgiant with an apparent magnitude of +4.71. It has an astrometric companion, 48 Cassiopeiae B, which is a F-type main sequence dwarf with an apparent magnitude of +6.41. These two stars orbit around their common centre of mass once every 60.5 years. Component B has a semi-major axis of 0.62 arcseconds, or 22 AU. A third companion, 48 Cassiopeiae C, is a fourteenth magnitude star located 24 arcseconds, or at least 850 AU, away. The primary is also a spectroscopic binary, and has an unresolved companion, meaning the system has at least four components.
References
- 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
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