89 Herculis

89 Herculis is a fifth-magnitude star in the constellation Hercules. Located about 4,000 light years away, it is among a rare class of post-AGB stars - low mass stars in the last stages of their lives, highly inflated to appear as supergiants.

89 Her is a spectroscopic binary system with the pair surrounded by a dusty disc. The system shows variable brightness and spectral line profiles. The companion has a very low mass and luminosity and orbits the primary in 288 days.

89 Her is classified as a semiregular variable star, V441 Her, varying from magnitude 5.3 to 5.5 in around 68 days.