MUDEHaR DR1 (March, 2025). MUDEHaR (MUlti-epoch Disparity Examination of H-Alpha and infraRed) is a multi-epoch photometric survey of two narrow filters: Hα and the calcium triplet window. Using the JAST telescope and T80Cam instrument at the Observatorio Astrofísico de Javalambre (OAJ, Teruel, Spain) is studying 40 square degrees of star forming fields in the Galactic disk. It will detect all kind of variable Hα stars on a days-months-years scale. . Please include the following in any published material that makes use of this data: "Based on observations made with the JAST80 telescope for the MUDEHaR project at the Observatorio Astrofísico de Javalambre, in Teruel, owned, managed and operated by the Centro de Estudios de Física del Cosmos de Aragón."