48 Cassiopeiae
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| 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 mas[1] |
| 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 | |
| Database references | |
| SIMBAD | data |
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.
48 Cassiopeiae also has the Bayer designation A Cassiopeiae, the only star with a latin letter designation in the constellation.[2]
References
- ^ a b c d e f 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
- ^ Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally published in: Institute of Astronomy of Russian Academy of Sciences (2002). 4027. Bibcode:2004yCat.4027....0K.
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