Tags: Star.
3 Puppis (3 Pup) is a binary star system in the constellation Puppis. Its apparent magnitude is 3.93. It is a white supergiant with a spectral class of A3Iab. It is surrounded by a cloud of circumstellar dust which is unusual for an A-type star suggesting that it may actually be a low-mass star transitioning from an asymptotic giant branch phase to a planetary nebula.