Crescent Moon, Jupiter and high clouds

Last night (6./7.2.2011) I was again observing in Parainen. During the day, sky was completely clear, but when I arrived in my observing site, I saw some high clouds in western horizon. Also Moon was visible, it appeared as a narrow crescent and Jupiter was close to it, and together they were a beautiful sight! But this time I didn’t came to observe objects of Solar system. I had planned to observe some open clusters in Monoceros-Orion-Puppis area. But those high clouds really ruined my plan. I couldn’t observe all objects I had planned to, and especially I wasn’t able to observe all nebulae that I wanted to see. So, transparency was weak and background sky was all but completely dark, so what to observe? Collinder clusters of course! Many of these clusters are visible also in poor conditions, so these are suitable choice for an evening like this.

I observed following objects: Collinder 91, NGC 2186, Collinder 107/104 and Collinder 106.

Collinder 106 and 107/104 are in a small area in Monoceros with many other clusters including NGC 2244 with Rosetta nebula. I also tried to observe that, but I could only see a one bright section of the nebula, so I decided to skip that for this night. Collinder 106 and 107/104 are poor, weakly detached clusters and they have relatively large apparent size. Collinder 91 is is slightly smaller in apparent size, but it is otherwise similar to the other typical Collinders in Monoceros. It is also situated 4° to SW from the area around NGC 2244/Collinder 106, -107/104. NGC 2186 is a nice, small compact cluster in Orion.

Summay for this session:

-Session id: #12/10-11
-Date: 6./7.2.2011
-Time: 20.00-22.00
-Instrument: N250/1200 mm
-Site: Stormälö, Parainen
-Conditions: NELM 6,0; seeing 3; background sky 3, calm/weak NW breeze, -4 °C, high clouds in the sky, weak transparency
-Objects observed: Collinder 91, NGC 2186, Collinder 107/104, Collinder 106.

Collinder 106 – another typical Collinder cluster (in winter sky)


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