|Object name:||Constellation:||Coordinates:||Apparent size:||Visual brightness:|
|NGC 40||Cepheus||13h01m / +72°31'||1.23' x 1.23'||11.7 mag|
The planetary nebula NGC 40 (also known as Bow-Tie Nebula or Caldwell 2) in the constellation Cepheus. 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 (65 minutes total exposure) at ISO 800 taken on September 18 / 19, 2020 were added for this shot with the DeepSkyStacker software 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).