This is a CCD image taken with a ST-9E CCD camera thru Kopernik's 20 inch F/8.1 telescope. The exposure was 700 seconds, the image scale is about 8 x 8 arc minutes, with South at the top.
This Planetary Nebula in the constellation of Cepheus is also cataloged as "Pk 120+9.1". Fleming discovered it in 1912. The central star is magnitude 11.5, and like many of its type, it has a strange spectrum (Type WC8) that shows evidence of rapidly escaping gas, and a very high surface temperature. It is in the process of evolving into a white dwarf star.
"Faint, very small, round, very abruptly much brighter middle, 12th magnitude star southwest."
Description of NGC 40 in: The Deep Sky Field Guide to Uranometria 2000:
"Irregular disk with traces of ring structure, involved in a larger and fainter disk of irregular form."
Planetary Nebulae: To learn more about them, click here.
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George Normandin, KAS
December 28th, 2001