48 Cassiopeiae

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48 Cassiopeiae A/B
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
A Cassiopeiae, HR 575, HD 12111, BD+70°153, HIP 9480, SAO 4554, ADS 1598, CCDM J02020+7054

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[edit]

  1. ^ 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