Tom Gehrels used Palomar 's Samuel Oschin telescope ( also known as the 48 - inch Schmidt Telescope ) .
Tom Gehrels shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out .
Tom Gehrels used Palomar 's Samuel Oschin telescope ( also known as the 48 - inch Schmidt Telescope ) , and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory where astrometry was carried out .