RA and DEC coordinates. One or a few objects (entered in successive lines) could be searched given the approximating $V$ magnitude of the object needed to compare with the limiting magnitude of the telescope (as given in Section 2). The output consists in the same columns as [*Mega-Precovery*]{}, including a link to the CCD overlay plot for most mosaic cameras included in [*Mega-Archive*]{}.

MASDS for Double Stars
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Following some data mining work in double stars using the OmegaCam archive [@Curelaru2017], in 2018 we implemented some tools for data mining the entire [*Mega-Archive*]{} for known double stars given by the Washington Double Stars Catalog (WDS) ID or the WDS Discoverer ID. This tool is named [*Mega Archive Search of Double Stars*]{} (acronym MASDS)[^27]. For observational planning we provide another tool named [*WDS Filter Datamining*]{}[^28] which allows as input the sky area (RA/DEC box limits), stars’ magnitudes, separation, existing observations and discoverer. Both these tools are presented fully in a recent paper [@Curelaru2019].

FindCCD for Moving and Fixed Objects
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Survey telescopes and larger field mosaic cameras are increasing in number, and [*Mega-Archive*]{} presently includes about 20 such powerful imaging instruments, with Subaru-HSC (104 CCDs) and Blanco-DECam (62 CCDs) leading the 