(156880) Bernardtregon = 2003 ES1
French amateur astronomer Bernard Tregon (b. 1968), from Bretagne, is a
friend of Michel Hernandez, one of the discoverers of this minor planet.
Tregon, who specialises in interferometry, often uses the amateur telescope
at Pic du Midi.
A complete set of naming citations of the numbered minor planets is available in the Dictionary of Minor Planet Names, edited by Lutz Schmadel.