Since the beginning of our installation we wanted to image this set of faint nebulae, but NGC 2170 is located in the constellation Unicorn, a few degrees below the celestial equator, the shots are disturbed by a veritable highway of satellites in geostationary orbit and our telescope captures many reflections due to large stars very close by,  It was therefore necessary to carry out many tests in order to obtain "processable" images.

Nebula NGC 2170 reveals an incredible mosaic of different types of gas clouds.NGC 2170 is one of the reflection nebulae, clouds of dust that reflect light from nearby stars - shown in blue in the image. It is next to emission nebulae, which emit light (here, in red tones) and dark nebulae (in black), which obscure the light.NGC 2170 is a stellar nursery that formed about 6 to 10 million years ago, located at the edge of the giant elliptical-shaped molecular cloud Monoceros R2 (Mon R2), about 2,700 light-years from Earth in the constellation Unicorn.

In fact, NGC 2170 is just the blue-and-pink nebula in the middle on the right edge of the image, while this enigmatic region – more than 15 light-years in diameter – presents in this image a mix of nebula types :
The bluish areas are reflection nebulae (NGC 2170, NGC 2182 & VdB69), so named because they reflect light from nearby hot stars. The size of dust particles in these areas preferentially reflects blue light, similar to that of cigarettes and other types of smoke. The red areas are emission nebulae, and glow because ultraviolet light from nearby stars excites hydrogen and other gas atoms in the nebula, which then emit their own light in specific colors. Finally, what looks a bit like black ink spilled over the image are dark absorption nebulae (LBN 994LBN993, LBN 998, & LBN 999), and are only visible because of the light they block. In other words, the dark nebula is seen in silhouette.
There are telltale signs of the continued formation of stars and massive young stars mostly hidden behind thick interstellar dust, which strongly absorbs ultraviolet and visible light. The energetic winds and intense radiation of these hot young stars are reshaping their natal interstellar clouds.