Friday, August 14, 2009

More gems in Sagitarius

Another clear night in midMO and this time I was able to get started shortly after dark. Before it got too hazy around 10:30 I was able to snag M20, M21, M24, M25, M55, and M75. Most were pretty easy to find. Three passing satellites were an interesting sideshow to the main event. One that passed by a globular cluster looked as if one of the cluster's stars came to life and crawled away. M75 was the hardest and also the smallest and dimmest. At a distance of about 67,500 light years, M75 is one of the more remote Messier objects and lies well beyond the galactic center. I found it by tracing a line from eps Sgr through Zet Sgr and about twice the distance between the two. Look for a group of four stars that looks like the four corners of a rectangle except that one of the corners fell out. The remaining diagonal points toward M75 in one direction and M55 in the other. Both are nice globulars but M55 is brighter. It was dim but nice in my 10mm ep and I was able to make out a dozen or more tiny component stars in the cluster. M8, the Lagoon Nebula, was also pretty with a cool dark lane through it. I was able to see it fairly well in my 7x50 binocs.
Jupiter and its four moons and twin bands rounded out the night which was finally capped off with a view of Neptune nearby and to the east. Neptune was quite dim at about mag 8 and a close companion to slightly dimmer SAO164675 which followed behind as they rapidly moved through my FOV. Calisto and Ganymede were on one side of Jupiter while Io and Europa were on the other.
The night started out with good seeing. I was able to make out all nine of the brighter stars of Sagitarius unaided and was even able to see the four stars making up the 'teaspoon' although I would call it a hocky stick. But what's a hocky stick got to do with a teapot?

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