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Stationkeeping in Mars orbit

Emily Lakdawalla • June 27, 2013 • 15

It had never occurred to me to think about geostationary satellites in Mars orbit before reading a new paper by Juan Silva and Pilar Romero. The paper shows that it takes a lot more work to maintain a stationary orbit at an arbitrary longitude at Mars than it does at Earth.

Browsing Landsat data is a lot easier than I thought it was

Emily Lakdawalla • February 08, 2013 • 2

With the Landsat Data Continuity Mission scheduled to launch on Monday, there's been a lot of Tweeting about Landsat, and through one such Tweet I learned about a resource that I hadn't known existed before: the LandsatLook Viewer. This is a graphical interface to more than a decade worth of Landsat data, a tremendous resource for anyone interested in Earth's changing surface, natural or manmade.

Pretty picture: Jupiter photo from an unusual source

Emily Lakdawalla • December 26, 2012 • 4

A recently launched Earth-observing satellite is using the stars to practice its pointing, and caught a neat animation of Jupiter.

Pretty picture: Landsat view of southern Greenland

Björn Jónsson • November 13, 2012

This is a very large (19000 pixels square) mosaic of the fjords and glaciers of southern Greenland. I had been interested for a long time in experimenting with the processing of Earth satellite imagery just to get a comparison to the other planets.

Hurricane Sandy: Thanks for lives saved already

Emily Lakdawalla • October 29, 2012

Today hurricane Sandy is a major threat to life and property across the west coast of the northern Atlantic ocean. I just want to give thanks in advance to all the people who have devoted their careers to making sure that Americans have sufficient warning of devastating, unstoppable weather events like this one.

NPP Earth observatory launched successfully, and I was there!

Emily Lakdawalla • October 28, 2011

Well, that was awesome. The NPP Earth observation satellite launched successfully an hour or so ago, and I was with a chilled but thrilled crowd of a few hundred people to watch it at Vandenberg Air Force Base.

NPP Tweetup schedule and launch timeline

Emily Lakdawalla • October 26, 2011

This evening I'll be headed up to Lompoc, California, to participate in my first Tweetup along with 25 other Tweeters.

NPP's launching next week, and I'll be there to see it! (Hopefully.)

Emily Lakdawalla • October 21, 2011

I'm (hopefully) headed to the launch of a Delta II (the last currently scheduled Delta II!) at Vandenberg Air Force Base, as one of only 20 people selected to participate out of more than 600 who registered.

Heads up! ROSAT is coming down this week

Emily Lakdawalla • October 17, 2011

It should give you a feeling of déjà vu: a defunct satellite's orbit is decaying, and because that orbit is circular it's going to be impossible to predict where and when along its ground track it's going to happen.

Earth observing satellites record large Arctic ozone loss

Jason Davis • October 14, 2011

Data from Earth observing satellites Aura and CALIPSO have shown record losses of seasonal ozone in the Arctic.

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