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Another Nifty Lunar Transit from SDO

19 Feb 2019, 21:08 UTC
Another Nifty Lunar Transit from SDO
(200 words excerpt, click title or image to see full post)

The previously scheduled station-keeping maneuver is delayed until next week (February 27). It's time to talk the lunar transit of March 6-7, 2019.From 2200 UTC on March 6,2019, until 0207 UTC on March 7 (5:00-9:06 pm ET, March 6) SDO will experience a lunar transit. The Moon will cover up to 82% of SDO's view of the Sun. This four-hour transit looks similar to the double transit of September 9-10, 2018, except that the shadow of the Moon is visible through the entire transit. Here is a movie from the Flight Operations Team that shows SDO, the Sun, and the Moon during the transit. The Moon moves from lower left to upper right in the images during the first half of the transit and upper right to lower left for the second half. The first part of the transit is caused by SDO overtaking the Moon as SDO moves in the afternoon part of its orbit. (SDO orbits over the Mountain Time Zone of the USA so the transit happens from 3:00-7:06 MT.) SDO's velocity of about 3 km/s is faster than the Moon's of 1 km/s and SDO overtakes and moves past the Moon-Sun line. The second part of ...

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