V355 Cephei

V355 Cephei

Light curve for V355 Cephei plotted from ASAS-SN data
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Cepheus
Right ascension 22h 49m 10.47s
Declination +59° 18′ 13.0″
Apparent magnitude (V) 10.55 - 11.4
Characteristics
Spectral type M2Iab
Variable type LC
Astrometry
Radial velocity (Rv)−64.29±0.61 km/s
Proper motion (μ) RA: −3.158 mas/yr
Dec.: −2.017 mas/yr
Parallax (π)0.2244±0.0289 mas
Distanceapprox. 15,000 ly
(approx. 4,500 pc)
Absolute magnitude (MV)−6.1
Details
Radius770±154 – 790 R☉
Luminosity106,000 L☉
Surface gravity (log g)−0.1 cgs
Temperature3,660 K
Other designations
IRC +60367, V355 Cep, 2MASS J22491046+5918129
Database references
SIMBADdata

V355 Cephei is a red supergiant located in the constellation of Cepheus. It has a radius between 770±154 and 790 solar radii, making it one of the largest known stars. It is a slow irregular variable with an apparent magnitude that ranges between 10.55 - 11.4.

References

  1. ↑ "All-Sky Automated Survey for Supernovae". ASAS-SN. Ohio Starte Uni. Retrieved 4 August 2025.
  2. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  3. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  4. 1 2 3 4 "VSX : Detail for V0355 Cep". vsx.aavso.org. Retrieved 2025-07-25.
  5. 1 2 3 4 Levesque, Emily M.; Massey, Philip; Olsen, K. A. G.; Plez, Bertrand; Josselin, Eric; Maeder, Andre; Meynet, Georges (2005-04-15), "The Effective Temperature Scale of Galactic Red Supergiants: Cool, But Not As Cool As We Thought", The Astrophysical Journal, 628 (2): 973, arXiv:astro-ph/0504337, Bibcode:2005ApJ...628..973L, doi:10.1086/430901
  6. 1 2 3 4 Healy, Sarah; Horiuchi, Shunsaku; Molla, Marta Colomer; Milisavljevic, Dan; Tseng, Jeff; Bergin, Faith; Weil, Kathryn; Tanaka, Masaomi (2024-05-07), "Red supergiant candidates for multimessenger monitoring of the next Galactic supernova", Monthly Notices of the Royal Astronomical Society, 529 (4): 3630–3650, arXiv:2307.08785, Bibcode:2024MNRAS.529.3630H, doi:10.1093/mnras/stae738