Minor Planet Circulars (
MPCs), established 1947, is a
scientific journal that is generally published on the date of each
full moon by the
Minor Planet Center. The
Circulars contain
astrometric observations, orbits and ephemerides of minor planets,
comets and certain
natural satellites. The astrometric observations of comets are published in full, while the minor planet observations are summarised by observatory code (the full observations now being given in the
Minor Planet Circulars Supplement). New numberings and namings of minor planets, as well as numberings of periodic comets, are announced in the
Circulars. New orbits for comets and natural satellites appear in the
Circulars; new orbits for minor planets appear in the Minor Planets and Comets Orbit Supplement.