HV 11423 (PMMR 114 or 140 LI-SMC) is a red supergiant star in the Small Magellanic Cloud.

It is also a variable star with a variation of up 2 magnitudes at visual wavelengths but essentially constant in the infrared.

[9] The bolometric luminosity is about 200,000 times more than Sun,[8] making it one of the most luminous cool supergiants, and appears to have remained unchanged during the brightness and spectral variations.

It is thought that the star is currently undergoing a period of intense instability, in which its effective temperature changes from 4,300 to 3,300 K in a time scale of months; V-band variability may be due primarily to variations in temperature as well as changes in the local extinction due to the creation and dissipation of circumstellar dust.

It is speculated that the star may be nearing the end of its life,[4] although the mass loss rate is still moderate at 0.0906 M☉ per million years.