AS Leonis Minoris (AS LMi), also known as TYC 2505-672-1, is an eclipsing binary system in the constellation of Leo Minor.

[4] AS LMi's variability was first detected in 2013, during a search for "disappearing stars" in the MASTER database.

[5] Because R Coronae Borealis variables fade repeatedly, the discovery of the star's dramatic brightness decline triggered a search of archival photographic plates for evidence of earlier dimming events.

[6][7] Tang et al. used DASCH to search the large collection of Harvard photographic plates, and found that the star had dimmed for three years during the 1940s.

They recognized that AS LMi is a very long period eclipsing binary, similar to the ε Aurigae system.