NR Vulpeculae

NR Vulpeculae is a red supergiant and irregular variable star in the constellation Vulpecula. It has an apparent magnitude varying between 9.13 and 9.61, which is too faint to be seen to the naked eye.

Characteristics
It has an spectral classification of M1Ia, meaning that it is a supergiant star of higher luminosity and spectral type M. Levesque et al. (2005) published a difference spectral type of K3I, meaning that it is a K-type supergiant star. NR Vulpeculae has expanded to 920 times the Sun's size and is currently emitting 200,000 times its luminosity. If placed in the Solar System, its photosphere would reach beyond Mars' orbit. It has a cool surface temperature of around 4,000K, giving it the typical orange color of a K-type star.

NR Vulpeculae is also a slow irregular variable, with an apparent magnitude ranging from 9.13 to 9.61.

It is considered a likely member of the Vulpecula OB1 stellar association.