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We report on the MASTER Global Robotic Net discovery of an eclipsing binary,MASTER OT J095310.04+335352.8, previously known as unremarkable star TYC2505-672-1, which displays extreme orbital parameters. The orbital periodP=69.1 yr is more than 2.5 times longer than that of epsilon-Aurigae, which isthe previous record holder. The light curve is characterized by an extremelydeep total eclipse with a depth of more than 4.5 mag, which is symmetricallyshaped and has a total duration of 3.5 yrs. The eclipse is essentially gray.The spectra acquired with the Russian 6 m BTA telescope both at minimum andmaximum light mainly correspond to an M0-1III--type red giant, but the spectrataken at the bottom of eclipse show small traces of a sufficiently hot source.The observed properties of this system can be better explained as the red gianteclipsed by a large cloud (the disk) of small particles surrounding theinvisible secondary companion.

Discovery of an unusual bright eclipsing binary with the longest known period: TYC 2505-672-1 / MASTER OT J095310.04+335352.8