Sh2-173
From time to time I obtain data sets from remote observatories. One of my favorite providers is Deep Sky West with telescopes in Chile and New Mexico. One of the data sets I received, was data from the HII-region Sh2-173, located in the constellation Cassiopeia.

The images were taken with the following equipment (DSW):
| Location | Rowe, New Mexico |
| Telescope | Astro Physics RH305 |
| Focal length [mm] | 1159 |
| Focal ratio | 3,8 |
| Mount | Paramount ME |
| Camera | SBIG STX 16803 |
| Filter | R:G:B:Hα:[OIII][SII] |
| Exposure time [min] | 240:240:190:720:270:180 |
| Resolution | 1,66″/px |
Data calibration and registration and the final processing was done with PixInsight.
The RGB bicolor result was as follows:

M16 in the Hubble palette HSO looks like this

M16 HSO palette
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