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Chacornac found one NGC object: NGC 1988 in Taurus. He discovered it on October 19, 1855 at Paris Observatory with a 10" refractor, published in Comptes Rendus 56, 637 (1863). He described the object as a 11 mag star with nebulosity (seen again on January 27, 1856). On November 20, 1862 the nebula had disappeared. Jean Elias Benjamin Valz (1787-1867), the director of Marseille Observatory could not find him in 1861, noting a false image of a star.
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