Cassini discovered the open cluster M 50 in Monoceros about 1709. It was later found by Messier and Bode again; see: Messier C., Catalogue des Nébuleuses et des amas d'Etoiles, Connoissance des Temps 1784, 227-272 (1781).

D	N	NI	Y	Ap	I	T	Observer	Name	Con	Type	S
1	N	2323	1709?	5,0	Rr	v	Messier 5.4.1772 Bode 2.12.1774	M 50	MON	II3m	4

Paris Observatory