Planetary Nebula Minkowski 4-17
The planetary nebula Minkowski 4-17 (M 4-17, PK 79+5.1) was discovered in 1948 by the German-American astronomer Rudolph Minkowski. He also contributed to the creation of the National Geographic Society - Palomar Observatory Sky Survey (POSS). The fourth list of planetary nebulae discovered by Minkowski (M 4-1 to M 4-18) was only introduced by Perek and Kohoutek in 1965. In the original list they were not numbered. 
The distance from M 4-17 is about 4.1 kpc (13'400 light years) and the radius 0.66 pc (2.15 light years). 
The planetary nebula Minkowski 4-17 (PK 79 + 5.1) is located in the constellation Cygnus. The best time to watch is April to November, when it is highest at night.