4 Cassiopeiae

4 Cassiopeiae

A light curve for 4 Cassiopeiae, plotted from Hipparcos data.[1] The assumed period is from Koen and Eyer (2002).[2]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 23h 24m 50.26237s[3]
Declination +62° 16′ 58.1094″[3]
Apparent magnitude (V) 4.96[4] (4.95 – 5.00)[5]
Characteristics
Evolutionary stage AGB[6]
Spectral type M2− IIIab[4]
B−V color index 1.676±0.010[4]
Variable type suspected[5]
Astrometry
Radial velocity (Rv)−38.99±0.23[7] km/s
Proper motion (μ) RA: +12.29[3] mas/yr
Dec.: −12.44[3] mas/yr
Parallax (π)4.15 ± 0.21 mas[3]
Distance790 ± 40 ly
(240 ± 10 pc)
Absolute magnitude (MV)−1.94[4]
Details
Mass2.3[8] M☉
Radius78[9] R☉
Luminosity1,419[9] L☉
Temperature4,000[9] K
Other designations
4 Cas, NSV 14549, BD+61°2444, FK5 882, HD 220652, HIP 115590, HR 8904, SAO 20614, WDS J23248+6217A[10]
Database references
SIMBADdata
Messier 52, with the bright star 4 Cassiopeiae on the right (north) edge of the image

4 Cassiopeiae is a red giant in the northern constellation of Cassiopeia,[10] located approximately 790 light-years away from the Sun.[3] It is visible to the naked eye as a faint, red-hued star with a baseline apparent visual magnitude of 4.96.[4] At the distance of this system, its visual magnitude is diminished by an extinction of 0.56 due to interstellar dust.[11] This system is moving closer to the Earth with a heliocentric radial velocity of −39 km/s.[7]

An evolved red giant star, currently on the asymptotic giant branch,[6] 4 Cassiopeiae has a stellar classification of M2− IIIab.[4] It is a suspected variable star of unknown type with a brightness that varies from visual magnitude 4.95 down to 5.00.[5]

Multiple star catalogues list a number of companions to 4 Cassiopeiae, all unrelated stars at different distances.[12] As of 2011, the magnitude 9.88 component B lay at an angular separation of 96.10″ along a position angle of 226° relative to the primary. Components C, E, F, and G are all fainter and more than two arc-minutes from 4 Cassiopeiae, and components C and G are themselves close doubles.[13]

4 Cassiopeiae is 40' north of the open cluster Messier 52, near the constellation border with Cepheus, although it is not a member of the cluster.[14]

  1. ^ Cite error: The named reference HIPCurve was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Koen was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference gcvs2017 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference eggen1992 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Famaey2009 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference kervella2019 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference dr2 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference dr3 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference baumgardt2000 was invoked but never defined (see the help page).