Bob Christy has provided final TCA (time of closest approach) values of his original observations, plus a subsequent one, and I have estimated corresponding positions. Kevin Fetter made a video this morning, from which I extracted a single point. I observed the object one rev after Kevin, and obtained three additional points. Here is the consolidated data set: 35938 09 052B 0604 F 20091112212203000 56 15 0110010+463152 39 35938 09 052B 0604 F 20091112231952000 56 15 0144520+773301 39 35938 09 052B 2701 G 20091113005856100 17 25 2233372-005672 27 S 35938 09 052B 0604 F 20091113011758000 56 15 0538160+675510 39 35938 09 052B 1775 G 20091113085840945 36 25 0731069+022616 67 S+070 05 35938 09 052B 2701 G 20091113105210100 17 25 0459253-020652 47 S+080 05 35938 09 052B 2701 G 20091113105406600 17 25 0548641-132048 27 S+080 05 35938 09 052B 2701 G 20091113105438880 17 25 0601570-162393 37 S+080 05 Here are updated elements: STSS Demo 2 1337 X 1353 km 1 35938U 09052B 09317.42273651 .00000000 00000-0 00000-0 0 07 2 35938 57.9962 318.7344 0010000 17.1121 343.0168 12.78965103 09 Arc 20091113.04-1113.45 WRMS resid 0.023 totl 0.019 xtrk I excluded Bob's data from the final result, only because the arc is very short, and the time precision is inherently quite a bit less than that of the optical data; also, the positions are estimates. However, Bob's TCA (time of closest approach) residuals are very good - his first and third times agree with the final result to within less than 1 s, and the middle point is only 2.3 s late - all are within the reported uncertainty margin. Within a longer arc, such data has been shown to yield accurate elements, whether used alone, or in combination with optical data. Ted Molczan ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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