48 Cassiopeiae: Difference between revisions

48 Cassiopeiae A/B
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Cassiopeia
Right ascension	02h 01m 57.450s
Declination	+70° 54′ 25.29″
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 mas/yr ; Dec.: −8.71 ± 0.46 mas/yr
Parallax (π)	28.36 ± 0.44 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

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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

^ ^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

This binary or multiple star system–related article is a stub. You can help Wikipedia by expanding it.

[van_Leeuwen2007-1] ^ ^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

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@@ Line 36: / Line 36: @@
 | names = A&nbsp;Cassiopeiae, [[Bright Star Catalogue|HR]]&nbsp;575, [[Henry Draper Catalogue|HD]]&nbsp;12111, [[Durchmusterung|BD]]+70°153, [[Hipparcos#Published catalogues|HIP]]&nbsp;9480, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;4554, [[Star catalogue#ADS|ADS]]&nbsp;1598, CCDM&nbsp;J02020+7054}}
 {{Starbox end}}
-'''48 Cassiopeiae''' is a [[star system]] in the [[constellation]] [[Cassiopeia (constellation)|Cassiopeia]].  It is approximately 116.9 [[light year]]s from [[Earth]].
+'''48 Cassiopeiae''' is a [[star system]] in the [[constellation]] [[Cassiopeia (constellation)|Cassiopeia]].  It is approximately 115 [[light year]]s from [[Earth]].<ref name="van Leeuwen2007"/>
 The primary component, '''48 Cassiopeiae A''', is a white [[stellar classification|A-type]] [[subgiant]] with an [[apparent magnitude]] of +4.71.  It has an [[astrometric binary|astrometric]] companion,  '''48 Cassiopeiae B''', which is a [[stellar classification|F-type]] [[main sequence|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 [[arcsecond]]s, or 22 [[Astronomical Unit|AU]].  A third companion, '''48 Cassiopeiae C''', is a fourteenth magnitude star located 24 [[arcsecond]]s, 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.