Kowalski has had a lifelong interest in astronomy with an emphasis on planetary science. As an amateur in Florida during the 1990s he developed an interest in astrometric and photometric observations of asteroids. He started the "Minor Planet Mailing List" in mid-1997.[1] Kowalski discovered 14627 Emilkowalski in 1998.[2]
On October 6, 2008, while observing with the CSS 1.5 meter (60") telescope at Mount Lemmon Observatory, he discovered 2008 TC3. Approximately 20 hours after its discovery this asteroid entered the Earth's atmosphere over Sudan, becoming the first asteroid discovered before impact with the earth.[4] Kowalski was honored with a small piece of 2008 TC3.[5]
On January 1, 2014, Kowalski found another impacting asteroid, this was designated 2014 AA. The impact zone for this asteroid was in the middle of the Atlantic Ocean.
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Comba, P. G. (1999). Paul G. Comba (ed.). "Proceedings of the 1999 Minor Planet Amateur/Professional Workshop". 1999 Minor Planet Amateur/Professional Workshop. Proceedings. Bibcode:1999mpap.work.....C.