Op 2-4-2016 om 18:52 schreef Ted Molczan via Seesat-l: > Marco Langbroek wrote: > >>> The orbit of object 16012L / 41442 is the same as that attributed to Hitomi in the 17 TLEs >> with ID 16012A / 41337 from >>> epoch 16086.39579725 through 16091.92327283. >> >>> USSTRATCOM's TLEs for Hitomi (16012A / 41337) from 16086.39579725 through 16091.92327283, >> were for the orbit of one of >>> the pieces of debris, which has since been reassigned to 16012L / 41442. >> >> >> Ted, >> >> May I offer the alternative suggestion that the initial "A" orbits might >> actually be object H, not L? >> >> L fits the new "A" better in terms of RAAN, but in most other elements (arg of >> perigee, MA, Mean Motion, inc, a) and in actual orbital position relative to the >> "new" A-object (and hence pass time), the H object seems to fit better imo. > > Propagating the epoch 16091.92327283 TLE of 16012A to the epoch of the epoch 16092.25625104 TLE of 16012L, yields a > nearly exact match. Inclination and RAAN are within 0.0001 deg, argument of perigee within 0.08 deg, and argument of > latitude within 0.003 deg. Perigee is within 0.012 km, apogee within 0.009 km. A conjunction analysis for 2016 Apr 01 > from 00-12 h UTC, reveals the orbits never more than 0.49 km apart. It is easy to conclude that they are of the same > object. > > The same exercise with respect to the epoch 16092.18948948 TLE of 16012H yields not as close a match of the elements, > including a 0.885 deg discrepancy in argument of latitude. The conjunction analysis reveals the orbits never closer than > 100 km, and gradually separating. > > Ted Molczan Hi Ted, I now agree with you. I actually initially did a similar exercise, but using the A elements from epoch 16086. With hindsight, those are of course still from a short arc and (looking at the TLE to TLE variation) less accurate. - Marco _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Sat Apr 02 2016 - 12:53:09 UTC
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