4 Cassiopeiae

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]

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

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. 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. 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. 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. 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. 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. "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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