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01/11/2022 – Ephemeris – The James Webb Space Telescope has been unfolded but more work is needed

January 11, 2022 Comments off

This is Ephemeris for Tuesday, January 11th. Today the Sun will be up for 9 hours and 5 minutes, setting at 5:23, and it will rise tomorrow at 8:17. The Moon, 2 days past first quarter, will set at 3:41 tomorrow morning.

As of Sunday night, when I’m recording this program, the James Webb Space Telescope is nearly 700 thousand miles (1,100 million kilometers) from Earth, more than two thirds the way to the L2 Lagrange point., and slowing down. It doesn’t want to overshoot the mark. The telescope is fully deployed except for the alignment of all the mirrors. 18 of which make up the 6.4 meter primary mirror. They have to be adjusted to act like a monolithic mirror with millionths of an inch tolerance. That may take 5 months. Sometime around the end of that we may get to see the First Light image from the telescope, an image of something other than the calibration stars they were using for the previous months to get all the mirrors aligned.

The astronomical event times given are for the Traverse City/Interlochen area of Michigan (EST, UT – 5 hours). They may be different for your location.

Addendum

James Webb Space Telescope temporatures 16 days after launch

James Webb Space Telescope temperatures 16 days after launch. It looks like the cold side temperatures are dropping by 1 or 2 degrees Celsius a day. Credit: James Webb Tracker by The Launch Pad YouTube Channel. Data from NASA.