S Cephei

S Cephei
S Cephei, as seen by the Wide-field Infrared Survey Explorer (WISE)
Object typeVariable star
Other designationsDO 39837, GCRV 13590, HD 206362, HIC 106583, HIP 106583, IRAS 21358+7823, IRC +80048, 2MASS J21351284+7837282, RAFGL 2785, SAO 10100, BD+77 827, C* 3055, CGCS 5406, LEE 336, [LFO93] 2135+78, TYC 4603-770-1, WEB 19282, Gaia DR2 2284711568256711040, S Cep
Observation data
(Epoch J2000)
ConstellationCepheus
21h 35m 12.8233s[1]
Declination+78° 37′ 28.185″[1]
Distance488.950 parsecs[1]
In visual light (V)
6.6 - 12.5
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S Cephei (S Cep), also designated as HD 206362, is a carbon star and Mira-type variable in the constellation Cepheus. Based on the measurement of its annual parallax by the Gaia satellite, the star is approximately ∼1,590 ly (∼487 pc) away from Earth.[1]

The Gaia satellite shows anomalies in the proper motion of S Cephei compared to its long-term proper motion. These anomalies could indicate the presence of an orbiting companion such as a red dwarf or a brown dwarf.[2]

S Cephei is a carbon star of spectral type C7.3e.[3] It is also a Mira-type variable star whose apparent magnitude varies from 6.6 to 12.5 in the form of a pulsation over a period of 484 days.[4] Its variability was discovered by Karl Hencke in 1858.[5]

  1. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ "SIMBAD references". ui.adsabs.harvard.edu. Retrieved 2022-04-28.
  3. ^ Cite error: The named reference Yamashita1975 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ "VSX : Detail for S Cephei". The International Variable Star Index. AAVSO. Retrieved 27 April 2022.