CTA 1 (SNR G119.5+10.2)
CTA 1 is a supernova remnant that consists of a 1.5 degree filamentary shell. The bright object near left of center is NGC 40, a small planetary nebula. The two objects are unrelated and are at different distances. The distance to CTA 1 is estimated about 4’600 lightyears and its age about 10’000 years.
CTA 1 stands for “CT”, the abbreviation for “Caltech” and the letter “A” denotes the first list of radio sources published by this observatory in 1960, as this object was previously not catalogued.
The small object near the top left corner is Hu 2, a faint planetary nebula with a size of 2x1.6′, recently discovered by the French amateur astronomer Laurent Huet.
[description from Sakib Rasool]