• Helin". www.planetary.org. Retrieved 16 March 2019. Lee Siegel (7 February 1993). "20-Year Quest Makes Astronomer No. 1 in Finding Doomsday Asteroids : Space:...
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  • 3 km MPC · JPL 15317 1993 HW1 — April 23, 1993 Palomar E. F. Helin  · 5.1 km MPC · JPL 15318 Innsbruck 1993 KX1 Innsbruck May 24, 1993 Palomar C. S. Shoemaker...
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