Dean W. Armstrong

This post is brought to you by the fact that I've been running a LiveCD version of the latest version of Ubuntu Linux on my home compu...

The Canon A540 does leak some near-infrared radiation through its IR blocking filter. I placed a two layer filter of exposed and developed ...

Kaguya is a Japanese moon orbiter that is sending back HD video. And awesome images.

Astronomers at the Catalina Sky Survey near Tucson discovered an object on November 7th and when the orbit was calculated it was a Near Ea...

Tooting my own horn. . . . .Comet 17P/Holmes Watch this . . . (well written Chicago Tribune story by Ryan Haggerty) "It's certainl...

We fought with clouds tonight and bad seeing (and bad focus), but we all agreed the comet was larger and fainter tonight. The nucleus was t...

As I mentioned earlier , Comet 17P/Holmes is very bright. It's bright enough to point a regular digital camera into the eyepiece of a h...

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...

If it's clear where you are, go outside right now and see Comet Holmes with your eyeballs, even with a nearly full moon nearby and even ...

A commenter on this image asked about the "blue" sky in my synthesized image, composed of UV, green, and near-IR frames. Color w...

Why, yes, there are visible passes for them tonight. Link to Heavens-Above .

Phil Plait looks at the low southern moon here that I mentioned last month

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...

It's the autumnal equinox today , the day when the Sun appears to cross over into the southern sky. The stirrings of winter are beginni...