Thank you, thank you, Phage. I've been making a decidedly feeble attempt to keep up with the LRO's journey, and this will most certainly help the
cause.
Originally posted by Phage
reply to post by MajesticJax
The LCROSS impact is scheduled for October 9.
Except for a few hours during the LOI burn the heaters have been keeping the telescopes at about 50 degrees C (122 F). It should take the heaters about two weeks to bring the cameras into focus. Focus test images acquired in orbit will tell us when the cameras are truly in focus.Source
Today the LRO Team powered up the LROC cameras for a few hours to collect engineering data. Over two orbits we monitored temperatures and background values to give us a leg up when we start commissioning phase imaging on Friday. Of particular interest is the temperature of the NAC CCDs, two parameters that control the background level of the camera, which are selected based on temperature. Having actual measurements beats a thermal model any day!
The LROC Narrow Angle Camera carbon-fiber structure absorbs water under ambient conditions (Earth's atmosphere) resulting in expansion, which puts the camera out of focus. Once in the vacuum of space the camera outgasses, the structure shrinks, and presto, the camera is in focus.
Originally posted by Phage
reply to post by VitalOverdose
I think they were more concerned about making sure every thing worked properly and not burning anything out than convincing you that the moon landings were not hoaxed.