|This infobox, "Template:Starbox begin", is from Wikipedia. The list of its authors can be seen in its edit history page. The data in this infobox may not agree or state what Wikipedia states.|
Epoch J2000 Equinox J2000
|Right ascension||21h 12m 47.24741s|
|Declination||+60° 05′ 52.8017″|
|Apparent magnitude (V)||+6.62|
|Evolutionary stage||Red supergiant|
|Spectral type||M2 Ib|
|Parallax (π)||0.63 ± 0.29 mas|
|Absolute magnitude (MV)||−5.72|
|Mass||16.6 ± 2.6 M☉|
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.
V419 Cephei is a red supergiant of spectral type M2I with an effective temperature of 3,700 K. It has an estimated radius of 590 R☉. K-band angular diameter measurements equal 5.90 ± 0.70 milliarcseconds, which leads to a figure not much higher, although the uncertainty in its distance must also be taken into account. Its has a radius of 2.7 AU. If placed at the Sun's location, it would engulf the orbits of Mercury, Venus, Earth, Mars, and roughly half of the asteroid belt. Despite its large size, it is far smaller than the two supergiants known in this constellation, Mu Cephei and VV Cephei A.
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.
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