NGC 2174 is a HII region in constellation Orion about 6400 light years away.

Embedded in this cloud we find open star cluster NGC 2175 which powers the bright glow of hydrogen and other gases.
In order to emphasize the strong emission of spectral lines of these different gases, most images of this object are acquired using narrow band filters. This picture however was taken basically without filter, which reveals the presence of quit some very nice reflection nebulae (swipe) which shine in the broad band light of some embedded bright stars.
In one of the zoomed in images you can clearly see the trace of an asteroid which was not entirely removed by the rejection algorithm of the stacking software used to combine almost thousand single frames to this single image. The asteroid 167 Urda is an object of 38km diameter and it is orbiting the sun in a safe distance to earth in the outer main asteroid belt between Mars and Jupiter. Its „year“ lasts almost 5 earth years. The trace is pretty short taking into account the total exposure time of this image. The reason is that the frames collected for this image have been acquired in two nights. The asteroid had already left the field of view in the second night session.
A second asteroid 28017 1997 YV13 left another small trace in this image (see annotated image). This asteroid is only 6km in diameter and it crosses Mars orbit on its course around the sun with an orbital period of about 4 years.

Celestron RASA 11 v2
Celestron CGX-L mount
RisingCam ATR3CMOS26000KPA
Optolong UV/IR Cut filter
Bortle 4-5
No moon

Nebula: 610x30sec + 359x10sec (~6h)

Stars: 359x10sec (~1h)

PixInsight