4 Cassiopeiae

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Template:Short description

4 Cassiopeiae
File:4CasLightCurve.png
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[3]
Right ascension Template:RA[4]
Declination Template:DEC[4]
Apparent magnitude (V) 4.96[3] (4.95Template:Snd5.00)[5]
Characteristics
Evolutionary stage AGB[6]
Spectral type M2− IIIab[3]
B−V Template:Engvar Script error: No such module "val".[3]
Variable type suspected[5]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[7] km/s
Proper motion (μ) RA: +12.29[4] mas/yr
Dec.: −12.44[4] mas/yr
Parallax (π)4.15±0.21 mas[4]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.94[3]
Details
Mass2.3[8] Template:Solar mass
Radius78[9] Template:Solar radius
Luminosity1,419[9] Template:Solar luminosity
Temperature4,000[9] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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File:Messier 52 M52 NGC 7654 Cassiopeia, with a TSAPO65Q (51668515734).jpg
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.[4] It is visible to the naked eye as a faint, red-hued star with a baseline apparent visual magnitude of 4.96.[3] 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.[3] 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 Script error: No such module "val". 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]

References

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  2. ↑ Script error: No such module "Citation/CS1".
  3. ↑ a b c d e f g Script error: No such module "citation/CS1".
  4. ↑ a b c d e f Script error: No such module "Citation/CS1".
  5. ↑ a b c Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ a b Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ a b c Template:Cite Gaia DR2
  10. ↑ a b Template:Cite simbad
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Template:Cite Gaia DR3
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".

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Template:Stars of Cassiopeia

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