CTA1 and NGC40

Image Title: CTA1 and NGC40 – two different ways of death.

Copyright: Mateusz Wiśniewski

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Date image was taken: September 10, 2026

Location: Czarne, Poland

Data Acquisition Method: Personal Telescope Setup

Description and Details: CTA 1 was the very first entry because it was 'heard' in radio waves before it was ever seen (!!)
In the optical spectrum, it is so faint that in a 1973 supernova remnants atlas, it was deemed the only one out of 24 objects too dim to be printed.
Unlike many other remnants, CTA 1 glows stronger in oxygen than in hydrogen. This accounts for its turquoise filaments and the nickname 'Burning Blue Dragon'.
Spinning at its core is what remains of the star—a pulsar. It was only detected later by the Fermi telescope, which observes the sky in gamma rays.
66h Ha OIII RGB
Askar FRA600, asi2600mm Antlia ha 3nm, OIII 3nm RGB-V

Name: Mateusz Wiśniewski

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