Hi: I would like to learn how to be assured that I am looking at the <latest> TLE information for the ISS. I use Heavens-Above and Space-Track to load TLE data into Software Bisque's TheSky in order to plan an imaging session. I look at the transit path and choose a good star to sync on and refine my GOTO's until the transit path crosses my CCD sensor. Instead of manually guiding my LX200 with ToUcam attached, I am going to place my tiny 7.9' x 5.9' FOV such that the ISS transects the rectangle as it transits my local sky. This morning (8 AM EST), I loaded the epoch 09037.82898148 TLE from H-A. I just went toSpace-Track (3:30 PM EST) and loaded the last 5 TLE's. Since I am using SAO 75883 as an easy star to sync on as the ISS transits and then culminates at ~89* ALT, the different TLE's have me placing my CCD chip east and west of SAO 75883 depending on the TLE used. Since this is a cat-and-mouse approach to capturing a mere 3 frames (30 fps) as the ISS zips past the sensor, I need very accurate placement. Three arc-minutes off east or west will surely cause me to miss the ISS transiting my sensor. Is there a certain time of day that the ISS TLE becomes the "latest" and most "accurate"? If the pass is at 18:14 EST, when should the latest TLE be sought? Thank you. Adam ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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