4 Cassiopeiae

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4 Cassiopeiae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 23h 24m 50.26237s[1]
Declination +62° 16′ 58.1094″[1]
Apparent magnitude (V) 4.96[2] (4.95–5.00)[3]
Characteristics
Evolutionary stage AGB[4]
Spectral type M2− IIIab[2]
B−V color index 1.676±0.010[2]
Variable type suspected[3]
Astrometry
Radial velocity (Rv)−38.99±0.23[5] km/s
Proper motion (μ) RA: +12.29[1] mas/yr
Dec.: −12.44[1] mas/yr
Parallax (π)4.15 ± 0.21[1] mas
Distance790 ± 40 ly
(240 ± 10 pc)
Absolute magnitude (MV)−1.94[2]
Details
Radius54[6] R☉
Other designations
4 Cas, BD+61°2444, FK5 882, HD 220652, HIP 115590, HR 8904, SAO 20614, WDS J23248+6217A[7]
Database references
SIMBADdata

4 Cassiopeiae is a wide binary star[8] system in the northern constellation of Cassiopeia,[7] located approximately 790 light-years away from the Sun.[1] It is visible to the naked eye as a faint, red-hued star with a baseline apparent visual magnitude of 4.96.[2] At the distance of this system, its visual magnitude is diminished by an extinction of 0.56 due to interstellar dust.[9] This system is moving closer to the Earth with a heliocentric radial velocity of −39 km/s.[5]

The primary member of this system, component A, is an evolved red giant star, currently on the asymptotic giant branch,[4] with a stellar classification of M2− IIIab.[2] It is a suspected variable star of unknown type with a brightness that varies from visual magnitude 4.95 down to 5.00.[3] As of 2011, the magnitude 9.88 secondary, component B, lay at an angular separation of 96.10″ along a position angle of 226° relative to the primary.[10] In the sky, the open cluster Messier 52 is 40' to the south of it, near the constellation border with Cepheus.

References[]

  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. S2CID 18759600.
  2. ^ a b c d e f Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  3. ^ a b c Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017), "General catalogue of variable stars", Astronomy Reports, 5.1, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  4. ^ a b Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal, 104: 275, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  5. ^ a b Famaey, B.; et al. (2009), "Spectroscopic binaries among Hipparcos M giants. I. Data, orbits, and intrinsic variations", Astronomy and Astrophysics, 498 (2): 627–640, arXiv:0901.0934, Bibcode:2009A&A...498..627F, doi:10.1051/0004-6361/200810698, S2CID 18739721.
  6. ^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  7. ^ a b "4 Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-13.
  8. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  9. ^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
  10. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
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