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Chasing Lunar-x

Discussion in 'Astrophotography and Imaging' started by Jim O'Connor, Sep 17, 2015.

Chasing Lunar-x

Started by Jim O'Connor on Sep 17, 2015 at 3:25 PM

4 Replies 1897 Views 2 Likes

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  1. Jim O'Connor

    Jim O'Connor Active Member

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    I thought I'd ramble a bit about a new observing goal, and my first try at it. First, some preamble.

    Although we live in Tucson, my wife Susan’s family has a reunion picnic every summer in Northern Ohio, Lake County east of Cleveland. She goes every summer; her mother is 95, there were 17 aunts and uncles in earlier times, and my wife has 55 first cousins. This is a big event. I usually don't go due to work, but now that I'm retired, no more excuses. I needed to go back just to prove I existed. Since we had a lot to do back there, we were planning on six weeks and driving, so I took my 10" SCT and several Mallicam instruments since some of the family members wanted a telescope experience. We were able to get a couple of public events together, but the weather was abominable. Here I was, thinking I'd avoid the monsoon season back home, byt we only had about five usable nights in five weeks. Two nights before we left, I saw that there was a Lunar-X prediction and I thought I'd try to see and image it, never having done so. The night was perfectly clear!

    Then I checked on the predicted time for Lunar-X, the artifact of a pair of intersecting ridges on the moon that are only visible for a few hours in terminator each month, on the website

    http://www.eyesonthe...oon/LunarX.aspx

    and saw that on the last clear night we would have before leaving, Aug 21, it was scheduled for 20:30 EST, a good time. But I forgot to add Daylight Saving Time, and it was really going to begin its appearance at 9:30 PM, so I spent an hour in the cold and bugs with nothing happening. It was 49 F, when usually in August it would be low 70s, and I hadn’t brought a jacket! But I was seeing the X start to become visible at 9:30 PM, so I waited a bit more and took the final images (10" SCT at f/5, Mallimcam Xterminator, three frame average at 1/4000 sec) at 9:45 PM. It would have been much better at 10:45 PM, but I was freezing and the mosquitos were still active (they laughed at insect repellent; they used it for dessert) so I packed it up for good, loading the setup into the car for our departure in two days. Next try will be Sept. 20, around 7 PM Tucson time.

    The final image I took is below, still too embedded in terminator. But now I have a quest; try to get a good image of the Lunar X and the Lunar V above it.

    Lunar-X.jpg
     
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  2. NerdThing

    NerdThing Member

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    Nice catch! I have only seen the X on one occasion and never imaged it. This sounds like a good challenge for the 'Connect' members to see who can get an image (any image!) of it.

    Thank for the link too, very helpful.
     
  3. Jim O'Connor

    Jim O'Connor Active Member

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    Thanks for the kind words. Seeing the Lunar -X can be a quest because it's only highlighted for about four hours each lunar cycle, and for at least part of those four hours it needs to be visible over your location along with appropriate viewing conditions. So of course, this month it is available not long after sunset in the early evening at my location in Tucson, but not very accessible due to predicted cloud cover. That's the way it is with astronomy, I suppose. I am amazed at the attempts to prove Einstein's Relativity theory by recording apparent star positions during a solar eclipse; the stars hidden in the glare of the sun should become visible, but their apparent location should be "warped" by the gravitational field of the Sun. So astronomers traveled around the world to observe totality, only to be weathered out. Even interesting occultations can get hidden by a cloud. Ah well, another quixotic astronomy chase.
     
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  4. Sky

    Sky New Member

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    Great shot of Lunar X ... congratulations!

    There's also the Lunar K visible a few days after full moon. Here's my shot taken on May 6, 11:49 EDT.

    Lunar-K.jpg
     
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  5. Jim O'Connor

    Jim O'Connor Active Member

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    Great image, James. I just read about the Lunar K yesterday in either Astronomy or Sky and Telescope. Looks like another astronomy quest, except the accessibility of Lunar K is a much bigger time window. Thanks for posting it!
     
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