HR 3831, also known as HD 83368, is a binary star system in the southern constellation of Vela at a distance of 233 light years. This object is barely visible to the naked eye as a dim, blue star with an apparent visual magnitude of 6.232. It is approaching the Earth with a heliocentric radial velocity of 4.0 km/s.
The star system is a visual binary with a 3.29″ projected separation, identified as such in 2002. The larger star, HD 83368A, is a pulsating variable of a rapidly oscillating Ap type. It has a single yet strongly distorted dipole pulsation mode with a frequency of 1427 μHz. The primary star is chemically peculiar, exhibiting spots of enhanced concentrations of lithium, europium and oxygen.
The star's variability was discovered by Pierre Renson, and announced in 1977. It was given its variable star designation, IM Velorum, in 1981.