Dean W. Armstrong

UPDATE 7/06/2009: Here's the current set of passes. There are another set of convenient evening passes of the International Space Stati...

Joe Cottral managed to get a spare 2.5m satellite dish from western Illinois to Chicago. The rest of the RAS had the responsibility of gett...

Click to enlarge. A total of 53 images, each 15 seconds each, totaling 13:25 minutes. Taken on December 29th, 2008. 42 Orionis is a bright ...

A moon mosaic from last night. I didn't take the images or process them; Will did all that. The only thing I've done is run it thr...

Click to enlarge

I showed some RAS folks how to use the CCD camera last night. We couldn't get the drivers installed on the new laptop, despite tweaking...

See the clouds go by at night at http://skycam.uchicago.edu/ . It's a field of view 30x50 degrees pointed south at about 50 degrees up....

We had a nice clear evening last night and took some photos over at Ryerson Observatory. I processed one last night real quick like. This ...

We had a great clear Monday after the RAS meeting so we got everyone to come up to the observatory to see the great outburst of Comet Holmes...

Things have been very busy and as a result I've been unable to post--but today is the 50th anniversary of man's entry into space wit...

As I mentioned in my last post , more images from the evening of May 17th. You can see the Moon--but look closely at the support wires on t...

The 29 hour-old moon was beautiful last night, and just a few degrees away was a suprisingly bright Mercury. Composite of two images. Both w...

Last December four members of the RAS were lucky enough to spend four days at the MMT/Fred L. Whipple Observatory located on Mt. Hopkins sou...

The Ryerson Astronomical Society sponsored a trip up to Yerkes Observatory this weekend. We split the 60-odd visitors into three groups a...

Chicago got a mostly cloudy eclipse--we never saw it fully eclipsed and only had glimpses as the Moon left the Earth's shadow. Here...

Carl Sagan died ten years ago today. Has it really been ten years? I guess I can say it has: new visitors to Ryerson Observatory often do ...

After the Ryerson Astronomical Society meeting Monday night, Steven, Katie and I went up to the dome and observed on a nice clear night. Sa...

Steven conveniently graphed the data from my geiger counter, covering a week in the Ryerson Astronomical Society office. http://gateway.spc...

Steven was trying to observe an asteroid occultation at that moment.