Dean W. Armstrong

I took a quick set of shots of Messier 27, a planetary nebula, last night from Ryerson , after fixing a piece of equipment on the telescope....

Have you ever driven from Las Vegas to Los Angeles? Two thirds of the way there, you are driving along I-15 in the high, dry Mojave Desert ...

This was posted on the Minor Planet Mailing List by Ladislav Nemec. Michael Brown wrote up his page about the issue here . Reiner Stoss fo...

http://www.nytimes.com/2005/09/13/science/space/13plan.html

Sure enough, as I suspected in my previous post , taking the potassium chloride out of the container brought the count rate up 50% to 120 mi...

Brown, Trujillo and Rabinowitz have submitted a paper to ApJ Letters for it: http://www.gps.caltech.edu/%7Embrown/papers/ps/xena.pdf

The TNO object first reported by the Ortiz et al now has a light curve that either has it spinning every fast and non-spherical or covered i...

The DPS of the American Astronomical Society is meeting with the Royal Astronomical Society (alas, not that RAS ) in Cambridge this week. T...

A store-bought container of potassium chloride, aka Salt Substitute, contains enough of the naturally occurring potassium-40 isotope ( 0.011...

The outer cirrus clouds from Katrina, seen this evening in Chicago.

True Story: I developed this animation _before_ discovering Jacques Descloitres of the MODIS Rapid Response Team, NASA/GSFC's work . It...

Just perusing TERRA images again, and I noticed the Salton Sea has a nice algal bloom going right now. Too many phosphates from farm runoff...

Brown's team, afraid of being upstaged by someone else, dropped the bomb in announcing 2003 UB313 -- and finally found the big one. Big...

The total system mass is 30% of Pluto's. http://www.aas.org/publications/baas/v37n3/dps2005/786.htm

2003 EL61. A Spanish survey claims to have found a mid 17th magnitude object with a proper motion consistent with a TNO at 51 AU distance,...