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We report on a radiopolarimetric observation of the Saturn-Jupiter GreatConjunction of 2020 using the MeerKAT L-band system, initially carried out forscience verification purposes, which yielded a serendipitous discovery of apulsar. The radiation belts of Jupiter are very bright and time variable:coupled with the sensitivity of MeerKAT, this necessitated development ofdynamic imaging techniques, reported on in this work. We present a deep radio"movie" revealing Jupiter's rotating magnetosphere, a radio detection ofCallisto, and numerous background radio galaxies. We also detect a bright radiotransient in close vicinity to Saturn, lasting approximately 45 minutes.Follow-up deep imaging observations confirmed this as a faint compact variableradio source, and yielded detections of pulsed emission by the commensalMeerTRAP search engine, establishing the object's nature as a radio emittingneutron star, designated PSR J2009-2026. A further observation combining deepimaging with the PTUSE pulsar backend measured detailed dynamic spectra for theobject. While qualitatively consistent with scintillation, the magnitude of themagnification events and the characteristic timescales are odd. We aretentatively designating this object a pulsar with anomalous refractionrecurring on odd timescales (PARROT). As part of this investigation, we presenta pipeline for detection of variable sources in imaging data, with dynamicspectra and lightcurves as the products, and compare dynamic spectra obtainedfrom visibility data with those yielded by PTUSE. We discuss MeerKAT'scapabilities and prospects for detecting more of such transients and variables.

The RATT PARROT: serendipitous discovery of a peculiarly scintillating  pulsar in MeerKAT imaging observations of the Great Saturn-Jupiter  Conjunction of 2020. I. Dynamic imaging and data analysis