V419 Cephei

V419 Cephei (BD+59°2342 or HIP 104719) is an irregular variable star in the constellation of Cepheus with an apparent magnitude that varies between 6.54 and 6.89.

V419 Cephei
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension  21h 12m 47.24741s[1]
Declination +60° 05′ 52.8017″[1]
Apparent magnitude (V) +6.62[2]
Characteristics
Evolutionary stage Red supergiant
Spectral type M2 Ib[3]
Variable type Lc[4]
Astrometry
Parallax (π)0.63 ± 0.29[1] mas
Distance1,085[5] pc
Absolute magnitude (MV)−5.72[2]
Details
Mass16.6 ± 2.6[6] M☉
Radius533[7] R☉
Luminosity (bolometric)45,300 - 46,100[7] L☉
Temperature3,660±170[7] K
Age10.0[6] Myr
Other designations
V419 Cep, HD 202380, HIP 104719, SAO 33232, BD+59°2342, AG+59 1417, GCRV 13343
Database references
SIMBADdata

Distance

Given its distance, V419 Cephei's Hipparcos-measured parallax of 0.63 ± 0.29 milliarcseconds is not constrained to evaluate its distance. Its most likely distance is 1085 ± 320 parsecs, equal to 3,540 ± 1,035 light years. It is a member of the stellar association Cepheus OB2-A.

Characteristics

V419 Cephei is a red supergiant of spectral type M2I with an effective temperature around 3,700 K and an estimated radius of 533 R☉. The K-band angular diameter measurements equal 5.90 ± 0.70 milliarcseconds,[8] which leads to a figure not much higher, although the uncertainty in its distance must also be taken into account. If placed at the Sun's location, it would engulf the orbits of Mercury, Venus, Earth, Mars, and roughly half of the asteroid belt.

V419 Cephei has a mass 16.6 solar masses, above the limit beyond which stars end their lives as supernovae. The life of such massive stars is very short. Despite its advanced evolutionary state, V419 Cephei is only 10 million years old.[6]

Billed as an irregular variable star of type LC, V419 Cephei's brightness varies between magnitudes 6.54 and 6.89 with no apparent periodicity.[4]

gollark: ++remind 2h actyallu
gollark: ++remind 7h check things herefnr wqs
gollark: Well, this will be their fatal flaw in the final showdown.
gollark: I see.
gollark: What? That's just composition, isn't it? Doesn't seem very rejected.

References
  1. van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. Table 4 in Levesque, Emily M.; Massey, Philip; Olsen, K. A. G.; Plez, Bertrand; Josselin, Eric; Maeder, Andre; Meynet, Georges (August 2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal. 628 (2): 973–985. arXiv:astro-ph/0504337. Bibcode:2005ApJ...628..973L. doi:10.1086/430901.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 405. doi:10.1051/0004-6361:20041272. pp. 165-186.
  6. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.
  7. Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158: 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd.
  8. Richichi, A.; Percheron, I.; Khristoforova, M. (2005). "CHARM2: An updated Catalog of High Angular Resolution Measurements". Astronomy and Astrophysics. 431 (4). Bibcode:2005A&A...431..773R. pp. 773-777.
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