The planetary nebula NGC 4361 in the constellation Corvus
on April 13, 2018 and on April 22 / 23, 2020. NGC 4361 is approximately 2500 light-years from
Earth and was discovered by German British astronomer William Herschel in 1785 (source: Wikipedia).
Sixty-three exposures of 3 minutes at ISO 800 were stacked with no dark frame subtraction with Deep Sky Stacker (resulting in a
3 h 10 min exposure) and further processed in Photoshop. Unfortunately, the 3 hour stack shows only a tiny bit more than a one
hour stack - the outer gaseous parts of NGC 4361 are rather faint.
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Equipment: Canon EOS 450D Baader modified camera, TeleVue Paracorr Type II coma corrector,
16" f/4.5 "Ninja" dobsonian telescope riding on a dual-axis Tom Osypowski equatorial platform,
Lacerta MGEN autoguider, Lacerta off axis system (field of view comparison:
image of the moon with the same equipment).
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