Observing site: Visitor Centre, Seitseminen National Park, Finland
Instrument: L102/1000mm (4” refractor)
Darkness of the background sky: 1
Weather: Clear sky, calm, no Moon, humid air, 10°C
Objects observed: SS Cyg (visual), U Umi (visual), Messier 56 (visual, sketching)
This session was again really dark, actually it was the new darkest session so far this season! During this session I recorded the best SQM -reading so far, 21,27! Also NELM was really good, 6,6. This time it wasn’t luckily so cold as it was last time, during this session temperature was about 10°C. The sky was mostly clear during the session, although there was some clouds in the sky, but they weren’t causing any major disturbance.
During this session, I was observing SS Cyg again, which is now showing signs of declining brightness. Í estimated that it’s brightness was about 9.2. Another variable star that I observed was U Umi, and i estimated that it’s brightness was about 10,4. Also this star is getting fainter now.
Besides variable stars, I observed deep sky too! It would have been a shame to not observe any deep sky objects because the conditions were so great! This time I observed and sketched Messier 56, a globular cluster in constellation of Lyra.
Messier 56: @ 133x, round, fuzzy nebula, not resolved into stars. Pretty even brightness distribution, no obvious central brightening.
Variable star observations: