On the discovery of the Trojan object 4060 = 1987 YT1 = Deipylos

TLDR: In this paper, a new Trojan object named Deipylos was discovered during an extensive search in 1987 for new Trojan objects with the ESO Schmidt telescope, two new Trojans were discovered One of these objects, 1987 YT1, was recovered at the subsequent dark run at ESO by DEBEHOGNE with the GPO instrument used in the astrographic mode.

Abstract: During an extensive search in 1987 for new Trojan objects with the ESO Schmidt telescope, two new Trojans were discovered One of these objects, 1987 YT1, was recovered at the subsequent dark run at ESO by DEBEHOGNE with the GPO instrument used in the astrographic mode New observations in 1989 by ELST at the GPO and ESO Schmidt led to definite numbering (4060) and naming (Deipylos) of this Trojan object The orbit is calculated starting from the discovery 1987/88 observations using a classic Gaussian procedure The orbit is subsequently improved by the method of the variation of the geocentric distances These orbital elements are compared with the osculating elements which have been obtained from orbit calculation using all available observations (1942–1989)