MY Cephei

Not to be confused with Mu Cephei.
MY Cephei

MY Cephei is the brightest star in this infrared image of NGC 7419.
Credit: 2MASS
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cepheus
Right ascension 22h 54m 31.698s[1]
Declination +60° 49′ 38.97″[1]
Apparent magnitude (V) 14.4–15.5[2]
Characteristics
Evolutionary stage Extreme[3] OH/IR red supergiant[4]
Spectral type M3,[5] M7–7.5 I[6] (M6–7Iab[2])
Apparent magnitude (G) 10.225[1]
Apparent magnitude (H) 2.98[7]
Apparent magnitude (K) 2.14[7]
Variable type SRc[2]
Astrometry
Proper motion (μ) RA: –2.637[1] mas/yr
Dec.: –1.883[1] mas/yr
Parallax (π)0.3398 ± 0.0708 mas[1]
Distance3,000+350
−290[8] pc
Details
Mass14.5[9] M☉
Radius1,134[10][a]–2,061[6][b] R☉
Luminosity155,000[10]–310,000[6] L☉
Temperature3,000[6]–3,595[5] K
Age9[6] Myr
Other designations
MY Cep, IRC +60375, 2MASS J22543171+6049388, IRAS 22525+6033, RAFGL 2987
Database references
SIMBADdata

MY Cephei (IRC +60375) is a red supergiant located in open cluster NGC 7419 in the constellation of Cepheus. It is a semiregular variable star with a maximum brightness of magnitude 14.4 and a minimum of magnitude 15.5.

MY Cephei has an unusual spectral type of M7.5, one of the latest spectral types of any supergiant, and is one of the most luminous and coolest red supergiants, as well as one of the largest known stars. If placed at the center of the Solar System, the star's surface would engulf the orbit of Jupiter and possibly even the orbit of Saturn.

  1. ^ a b c d e f 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. ^ a b c "GCVS Query=MY Cep". General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia. Retrieved 2020-08-06.
  3. ^ Davies, Ben; Beasor, Emma R. (2019). "The distances to star clusters hosting Red Supergiants: χ per, NGC 7419, and Westerlund 1". Monthly Notices of the Royal Astronomical Society: Letters. 486: L10–L14. arXiv:1903.12506. doi:10.1093/mnrasl/slz050. S2CID 88517447.
  4. ^ Beauchamp, Alain; Moffat, Anthony F. J.; Drissen, Laurent (1994). "The galactic open cluster NGC 7419 and its five red supergiants". Astrophysical Journal Supplement Series. 93: 187. Bibcode:1994ApJS...93..187B. doi:10.1086/192051.
  5. ^ a b Cite error: The named reference messineo2021 was invoked but never defined (see the help page).
  6. ^ a b c d e Humphreys, Roberta M.; Helmel, Greta; Jones, Terry J.; Gordon, Michael S. (August 2020). "Exploring the Mass Loss Histories of the Red Supergiants". The Astronomical Journal. 160 (3): 145. arXiv:2008.01108. Bibcode:2020AJ....160..145H. doi:10.3847/1538-3881/abab15. S2CID 220961677.
  7. ^ a b Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  8. ^ Cite error: The named reference Davies2020 was invoked but never defined (see the help page).
  9. ^ Marco, A.; Negueruela, I. (2013). "NGC 7419 as a template for red supergiant clusters". Astronomy & Astrophysics. 552: A92. arXiv:1302.5649. Bibcode:2013A&A...552A..92M. doi:10.1051/0004-6361/201220750. S2CID 53723223.
  10. ^ a b Beasor, Emma R; Davies, Ben; Arroyo-Torres, B; Chiavassa, A; Guirado, J. C; Marcaide, J. M; Alberdi, A; De Wit, W. J; Hofmann, K. -H; Meilland, A; Millour, F; Mohamed, S; Sanchez-Bermudez, J (2018). "The evolution of red supergiant mass-loss rates". Monthly Notices of the Royal Astronomical Society. 475 (1): 55. arXiv:1712.01852. Bibcode:2018MNRAS.475...55B. doi:10.1093/mnras/stx3174. S2CID 55822928.


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