Monthly Archives: June 2015

Commissioning starts

We’re now embarked on the long, slow process of commissioning.  There’s a lot of things that we need to work on: limits and stops to protect the telescope and mounts in case the software does something stupid, getting the mount on Mauna Loa going with the Pathfinder telescope, mount software, learning how to reduce these huge new images, and starting to discover asteroids.  It’s the usual stuff.  Next week we’ll activate the telescope on Mauna Loa and start to get some parts built for limits and other things.  In the meantime we left Haleakala in the hands of our capable night assistants, Griselda and Mortimer, who provide indispensible help every night we collect data and shake the system into full operation.
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Optics Performance

Wednesday we worked to explore the image performance as a function of detector position relative to the field correctors.  We got pretty good images over the whole field of view, but the seeing was poor.  We’re thinking we’ve got to vent this dome – the skin gets really hot during the day and the closed telescope tube takes a long time to cool off.
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Thursday we cleaned, cleaned, cleaned!  We put things on UPS’s, rebooted everything to ensure that we can run remotely (or robotically), and finally drove down (during the day!), very tired but very pleased.  ATLAS is now real.

Polar alignment and tracking

After a misty day and evening we finally opened up and got to work on mount alignment.  Once aligned we did a quick test of tracking (about one pixel drift in 10 minutes, but we should do better), tried to take a picture of the Lagoon and Trifid Nebulae (which were only 20 deg from the full moon), and called it a night.  Things are starting to work very well.
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ATLAS on sky

Sunday we rotated the telescope for better balance, installed the 110 megapixel science camera, installed seven filters: cyan, yellow, B, V, R, I, and H-alpha, rebalanced, and waited for the sky to clear.  Finally, around 11pm the fog dropped enough (although it was still extremely humid) and we opened the dome and got our very first images.  There is a lot of work yet to do, but the first ATLAS unit has all subsystems operational.
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