Stargazer95050

Stargazer95050

Posted on 12/13/2013


Photo taken on December 12, 2013


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ISS will transit in front of the full Moon (SF Bay Area)

ISS will transit in front of the full Moon (SF Bay Area)
If you are living in the San Francisco Bay Area / Silicon Valley you can see the ISS as it passes in front of the rising, full moon. But don't blink or you will miss it -- it lasts for about 2 SECONDS !!
And you have to be in the right place (dark-purple or blue line -- the closer you get to the red lines, the shorter the transit will be, outside this narrow band you won't see it at all.

When & Where :
Dec 19th 2013, sometime between 8:06pm and 8:16pm. The predictions do not come to the same results. Furthermore they slightly vary WHERE along this path you are

HOW to observe it
First, you need a nearly unobstructed view of the eastern horizon (77° east) since the moon still is quite low -- 7°...10° above the horizon. My suggestion are places along I-35 Skyline Blvd or some of the public accessible Peninsula shores of the bay
To photograph it, get the longest tele you have -- or binoculars.
Capturing the transit will be a challenge since it lasts only 2 seconds but the predictions have a 10 minute window. Hopefully in the coming days that window will shrink. DON'T FORGET, the moon moves during that 10 minute time-frame and you will have to adjust your lens to follow the moon.

NOTE :
The moon is quite bright, even as it rises and that can make it difficult to see the tiny ISS and to best balance the exposure. Too bright an exposure can cause blooming and that will wash out the ISS.
The ISS WILL BE A TINY DOT -- take a sample shot of the full moon, divide the diameter by 30 and you have the BEST CASE size of the ISS.: size comparison : /stargazer95050/28183923


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snap1813.jpg

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Comments
Stargazer95050
Stargazer95050
My first attempt at capturing the ISS (solar transit) was foiled by weather. This will be the first time I attempt that shot of the ISS in front of the moon, therefore I have now proven recipe on how to do that, just good, educated guesses (and experience capturing detailed lunar images).
Here are some more thoughts on how to prepare : /blog/stargazer95050/600541
12 months ago.
Stargazer95050
Stargazer95050
The predictions of the centerline and time now are converging in both tools
CALSKY now also has the ISS close to the blue line (was purple line) and transit at 20:16
Simulation with Stellarium comes close and predicts 20:15

Heavens-above show the ISS pass but doesn't calculate the lunar transit : www.heavens-above.com/PassSummary.aspx?satid=25544&lat=37.4149&lng=-122.0473&loc=Unspecified&alt=0&tz=PST
CALSKY page : www.calsky.com/?Transitline=&showhome=&obs=56664726960389&tdt=2456646.67867447&sat=25544&interval=0.00011574&step=0.00000231&mainbody=10
12 months ago. Edited 12 months ago.