Star in the constellation Cassiopeia
σ Cassiopeiae Location of σ Cassiopeiae (circled)
Observation dataEpoch J2000.0 Equinox J2000.0 Constellation Cassiopeia σ Cas A Right ascension 23h 59m 00.538s [ 1] Declination +55° 45′ 17.75″[ 1] Apparent magnitude (V)5.01[ 2] σ Cas B Right ascension 23h 59m 00.331s [ 3] Declination +55° 45′ 20.37″[ 3] Apparent magnitude (V)7.24[ 2] Characteristics σ Cas A Spectral type B2 IV[ 4] U−Bcolor index −0.82 B−Vcolor index −0.07 Variable type β Cep [ 5] [ 6] σ Cas B Spectral type B3 V[ 4] Astrometry σ Cas A Radial velocity (Rv )−12.6[ 7] km/s Proper motion (μ)RA: +9.956[ 1] mas /yr Dec.: −4.492[ 1] mas /yr Parallax (π)2.7419± 0.1491 mas [ 1] Distance 1,190 ± 60 ly pc ) Absolute magnitude (MV )−3.90[ 5] Radial velocity (Rv )−5.0[ 7] km/s Proper motion (μ)RA: +8.651[ 3] mas /yr Dec.: −3.739[ 3] mas /yr Parallax (π)2.2572 ± 0.0558 mas [ 3] Distance 1,440 ± 40 ly pc ) Absolute magnitude (MV )−1.7[ 4] Details[ 5] A Mass 12 M ☉ Radius 11.3 R ☉ Luminosity 25,000 L ☉ Surface gravity (log g )3.6 cgs Temperature 21,000 K Rotational velocity (v sin i )170 km/s Age 15.8 Myr Other designations 8 Cassiopeiae,HR 9071,HD 224572,BD +54°3082,HIP 118243,SAO 35947,ADS 17140,CCDM J23591+5546Database references SIMBAD data
σ Cassiopeiae in optical light Light curves for Sigma Cassiopeiae, plotted fromTESS data.[ 8] Sigma Cassiopeiae (σ Cas, σ Cassiopeiae) is abinary star in theconstellation Cassiopeia . It is 1,200 tolight years Earth and has a combinedapparent magnitude of +4.88,[ 9] naked eye .
The primary component, σ Cassiopeiae A, is aB2 subgiant with anapparent magnitude of +5.0. Its companion, σ Cassiopeiae B, is aB5 main sequence dwarf with an apparent magnitude of +7.1. The two stars are threearcseconds apart.[ 10]
InChinese ,螣蛇 Téng Shé Flying Serpent α Lacertae ,4 Lacertae ,π2 Cygni ,π1 Cygni ,HD 206267 ,ε Cephei ,β Lacertae ,ρ Cassiopeiae ,τ Cassiopeiae ,AR Cassiopeiae ,9 Lacertae ,3 Andromedae ,7 Andromedae ,8 Andromedae ,λ Andromedae ,κ Andromedae ,ι Andromedae , andψ Andromedae . Consequently, theChinese name for σ Cassiopeiae itself is螣蛇十一 Téng Shé shíyī the Eleventh Star of Flying Serpent ).[ 11]
^a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties" .Astronomy and Astrophysics .674 : A1.arXiv :2208.00211 Bibcode :2023A&A...674A...1G .doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source atVizieR .^a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars".Astronomy and Astrophysics .355 : L27.Bibcode :2000A&A...355L..27H . ^a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties" .Astronomy and Astrophysics .674 : A1.arXiv :2208.00211 Bibcode :2023A&A...674A...1G .doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source atVizieR .^a b c Abt, H. A.; Cardona, O. (1983)."Confirmation among visual multiples of an increase of AP stars with age" .Astrophysical Journal .272 : 182.Bibcode :1983ApJ...272..182A .doi :10.1086/161276 ^a b c Catanzaro, G.; Ventura, R.; Ferrara, F.; Paternò, L. (2010). "Spectroscopic analysis of the candidate β Cephei star σ Cas: Atmospheric characterization and line-profile variability".New Astronomy .15 (1): 39.Bibcode :2010NewA...15...39C .doi :10.1016/j.newast.2009.05.001 . ^ Balona, L. A.; Ozuyar, D. (April 2020)."Pulsation among TESS A and B stars and the Maia variables" .Monthly Notices of the Royal Astronomical Society .493 (4):5871– 5879.arXiv :2001.04497 Bibcode :2020MNRAS.493.5871B .doi :10.1093/mnras/staa670 ^a b Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations".Astronomische Nachrichten .328 (9):889– 896.arXiv :0705.0878 Bibcode :2007AN....328..889K .doi :10.1002/asna.200710776 .eISSN 1521-3994 .ISSN 0004-6337 .S2CID 119323941 . ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes" . Space Telescope Science Institute. Retrieved1 October 2024 .^ Nicolet, B. (1978). "Catalogue of homogeneous data in the UBV photoelectric photometric system".Astronomy and Astrophysics .34 : 1.Bibcode :1978A&AS...34....1N . ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001)."The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" .The Astronomical Journal .122 (6): 3466.Bibcode :2001AJ....122.3466M .doi :10.1086/323920 ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日 Archived 2011-05-21 at theWayback Machine
