NGC 40 (Cepheus)

Object: Constellation: Coordinates: Size: Brightness:
NGC 40 Cep 13h01m / +7231' 1.23' x 1.23' 11.6mag

The planetary nebula NGC 40 (also known as Bow-Tie Nebula or Caldwell 2) in the constellation Cepheus on September 18 / 19, 2020. NGC 40 is composed of hot gas around a dying star. The central star has a surface temperature of about 50,000 degrees Celsius and is approximately the size of the Earth. NGC 40 is roughly 3,000 light-years from Earth and was discovered by William Herschel in 1788 (source: Wikipedia).

Twenty-two 3 minute exposures at ISO 800 were added for this shot with the DeepSkyStacker software (resulting in a 1 hour 5 minute exposure) and the final image processing was done in Photoshop.
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).

Search chart 1 for NGC 40. Map © 2020 "The Mag-7 Star Atlas Project", Map is slightly modified. The map can be downloaded here .