The Iris nebula is a bright reflecion nebula in the constellation Cepheus.
It's appearance is caused by the very hot star HD 200775 in it's centre
whose light is partly reflected and partly absorbed by surrounding dust clouds.
As can be seen from the labeled image, the dust cloud itself can be found in
Lynd's cataologue of dark nebulae as entry LDN 1174.
The reflection nebula shines at magnitude +6.8.
It lies 1,300 light-years away and is six light-years across
NGC 7023 in Constellation Cepheus, Telescope Newton 10" f/4, Camera Atik 460EXM, Total Exposure Time 12h35min
In the constellation Auriga on clear winter nights one can find the open cluster NGC 1893 embedded in the emission nebula IC 410.
While NGC 1893 can be observed visually using a telescope with proper aperture the faint nebula IC 410 is a real hard case for the visual
observer and much easier to catch by photography.
Due to some smaller but prominent star formation regions the nebula IC 410 is nicknamed as the "tadpole nebula".
IC 410 was discovered on September 25, 1892 by the (german) astronomer Max Wolf (June 21, 1863 - October 3, 1932) while the
open cluster NGC 1893 was discovered already earlier on January 22, 1827 by the (british) astronomer
John Herschel (Mar 7, 1792 - May 11, 1871).
IC 410 and NGC 1893, camera Atik 460EXmono, optics Lacerta Newton f=1000mm f/4, 2023-02-08, Bad Kreuznach, Germany
What can be seen in the image is what cannot be seen visually through a telescope. The image
is presented in false colors resulting from an (amongst astro-photographers
widely known) image acquisition technique using narrow band filters.