"NGC 40 (also known as the Bow-Tie Nebula and Caldwell 2) is a planetary nebula discovered by W.F.Herschel Nov 25 1788, and is composed of hot gas around a dying star. The star has ejected its outer layer which has left behind a smaller, hot star with a temperature on the surface of about 50,000 degrees Celsius. Radiation from the star causes the shed outer layer to heat to about 10,000 degrees Celsius and is about one light-year across. About 30,000 years from now, scientists theorize that NGC 40 will fade away, leaving only a white dwarf star approximately the size of Earth."
https://en-academic.com/dic.nsf/enwiki/1992943Continuing the fascination for planetary nebulae, Maurizio finally made a session in a small and remote gem that he had already identified in his nightly searches for being very bright and almost pink, the Bow-Tie Nebula.
I decided to work them immediately after the Crab nebula as it was a short session. The data was processed with the Ha script and Siril [OIII], and by making a normal stack with DSS I achieved a combination of channels in RGB - HHO palette colourization mode, trying to get the best information from it.
Surprised the fact of being able to observe the nebulosity that emerges on one of its sides in an elongated way, as well as its central star and another on the edges of the gas expansion and some pattern in its interior.
I think this is a target better for OTA's more than 1200mm, mybe we get back to this in the future.
Processed April 6th, 2021
https://twitter.com/AstroOtus/status/1379485487270879233
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