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The Andromeda Galaxy recurrent nova M31N 2008-12a has been caught in eruptionnine times. Six observed eruptions in the seven years from 2008 to 2014suggested a duty cycle of ~1 year, which makes this the most rapidly recurringsystem known and the leading single-degenerate Type Ia Supernova progenitorcandidate; but no 2010 eruption has been found so far. Here we present evidencesupporting the recovery of the 2010 eruption, based on archival images taken atand around the time. We detect the 2010 eruption in a pair of images at 2010Nov 20.52 UT, with a magnitude of m_R = 17.84 +/- 0.19. The sequence of seveneruptions shows significant indications of a duty cycle slightly shorter thanone year, which makes successive eruptions occur progressively earlier in theyear. We compared three archival X-ray detections with the well observedmulti-wavelength light curve of the 2014 eruption to accurately constrain thetime of their optical peaks. The results imply that M31N 2008-12a might have infact a recurrence period of ~6 months (175 +/- 11 days), making it even moreexceptional. If this is the case, then we predict that soon two eruptions peryear will be observable. Furthermore, we predict the next eruption will occuraround late Sep 2015. We encourage additional observations.

A remarkable recurrent nova in M 31: The 2010 eruption recovered and evidence of a six-month period