V419 Cephei is a
red supergiant of spectral type
M2 Ib with an
effective temperature around 3,700
K and an estimated radius of 533
R☉. The
K-bandangular diameter measurements equal 5.90 ± 0.70 milliarcseconds,[10] 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.[8]
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.[3]
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abcSamus, 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.