target can be searched using an input consisting in a block of observations in MPC format[^25]. In this case, [*OrbFit*]{} is run locally on the EURONEAR server, either using a single step ephemerides model (given at least 3 observations taken in one or few nights following discovery) or a three steps model (defined by blocks of discovery and follow-up data, first opposition data, and multi-opposition data).\
All three search options are provided with a few advanced options: All instruments or only some archives selected by the user could be searched at once in [*Mega-Precovery*]{}. The computational interval can be constrained in an interval around the observations (to speed up the search of the entire [*Mega-Archive*]{}) or left default to cover all archives. The safety search border allows some flexibility due to telescope pointings (sometimes insecure, affected by small dithering during multiple run exposures, or due to the pointing not matching the camera centre). The default value of the safety border is $0.02^\circ$, which means that the search could allow any target outside the image by up to $1.2^\prime$ to be included in the results. The running mode allows the user to chose between fast geocentric ephemerides (where all ephemerides and 