Messier 93 is an open cluster located in constellation Puppis and it is about 3400 light-year away from Earth. The cluster is one of those deep space objects, which I cannot see from my home, therefore I had to pack the gear and enjoy starry night outside. Compared to my previous attempt, I took the laser collimator with me and waited sufficiently long the temper the telescope. Well I was surprised that the stars are slightly oval and there is blue halo on one side and red one on the other side of nearly each star. I was speculating if there is something wrong with the optics, but then I realized that this object has very low declination (it’s not far from horizon), therefore it’s exposed to atmosphere refraction/dispersion. This means that the light must pass through the thick layer of an air. In this case the atmosphere works as a lens and bends red and blue light differently. The effect is described here or here.
|Telescope||Newton 150/600 mm|
|Focal length||630 mm|
|Autoguiding||ZWO 174MM, Guidescope 30 mm|
|Camera||ZWO 071 Pro @-20°C|
|Corrector||Explore Scientific HR|
|Filters||Hutech IDAS LPS-D2|
|Exposure||30x60s, Gain 136, bin 1x1,|