Winnecke was an assiduous observer who discovered 10 comets between 1854 and 1877, among them periodic comet 7/P Pons-Winnecke. One of them, 1868 II, became famous for being the first one to have its spectrum observed (visually by William Huggins). He did a large number of stellar observations. In Strasbourg, he initiated a survey of 'nebulae' with the goal of obtaining exact nebular positions which was completed by Kobold and Wirtz in 1911 only.
In 1869, he published a paper entitled "Doppelsternmessungen (Double Star Measurements), in Astronomische Nachrichten No. 1738, vol 73, p 147-160, published in Altona, February 8, 1869. In this paper he included 7 newly discovered double stars, the "Winnecke Catalog of Double Stars." No. 4 of them, Winnecke 4, is M40, as found out by John Mallas.
Winnecke discovered several other deepsky objects, including 8 real and 1 non-existing NGC objects (communicated by letter to Dreyer).
Comets:
C/1854 Y1 1854 V Winnecke-Dien (I.1855) 7P/1858 E1 1858 II P/Pons-Winnecke (II. 1858) C/1867 S1 1867 III Baeker-Winnecke C/1868 L1 1868 II Winnecke 7P/1869 G1 1869 I 1869a P/Pons-Winnecke C/1870 K1 1870 I 1870a Winnecke C/1870 W1 1870 IV 1870d Winnecke C/1871 G1 1871 I 1871a Winnecke C/1874 D1 1874 I 1874a Winnecke C/1874 G1 1874 II 1874b Winnecke 7P/ 1875 I 1875b P/Pons-Winnecke C/1877 G1 1877 II 1877b WinneckeLinks