P-L

In asteroid naming, the designation P-L stands for Palomar-Leiden, named after Palomar Observatory and Leiden Observatory, the observatories at which asteroid searchers Tom Gehrels of the University of Arizona, Ingrid van Houten-Groeneveld and Ingrid's husband Cornelis Johannes van Houten of the Netherlands collaborated on a famously fruitful asteroid search in the 1960s.

Gehrels used Palomar's 48-inch Schmidt camera and shipped the photographic plates to Leiden. The trio are credited with several thousand asteroid discoveries.

References

* [http://in.news.yahoo.com/071005/139/6ll7d.html Long-lost 'Potentially Hazardous Asteroid' re-located] (Asian News International)