The astrometry below was obtained beta-testing a not yet public version of TANGRA, which is Windows software by Hristo Pavlov to do astrometry on video records. 41334 16 010A 4353 G 20170408213108452 17 75 1334339+544873 56 S+061 10 41334 16 010A 4353 G 20170408213108652 17 75 1334167+545422 56 S+059 10 41334 16 010A 4353 G 20170408213108852 17 75 1333589+545972 56 S+058 10 41334 16 010A 4353 G 20170408213109012 17 75 1333448+546417 56 S+059 10 41334 16 010A 4353 G 20170408213109252 17 75 1333241+547074 56 S+060 10 36104 09 066A 4353 G 20170408213530590 17 75 0940411+664538 56 S+067 10 36104 09 066A 4353 G 20170408213530750 17 75 0940065+665472 56 S+068 10 36104 09 066A 4353 G 20170408213530950 17 75 0939251+666616 56 S+068 10 36104 09 066A 4353 G 20170408213531190 17 75 0938339+667990 56 S+068 10 ------------------------------------------------------------------------- WATEC 902H + SamYang 1.4/85 mm + TANGRA astrometric software, UCAC-4 star catalogue, GPS time inserter. What these numbers mean: http://www.satobs.org/position/IODformat.html ------------------------------------------------------------------------- TANGRA was originally made for telescopic video astrometry on close approaching NEA's, but Hristo has adapted it for me to be able to work with wider fields. A test on a number of Iridium sats so far yielded impressively accurate results. The camera was a WATEC 902H equipped with a Samyang 1.4/85 mm lens. Time source was a GPS time inserter. Reference star catalogue is UCAC-4. The sky was very clear, the moon no real nuisance. Residuals with respect to timely TLE's for two Iridium sats as an example: Iridium 51 (98-018A), TLE epoch 17098.80426348 25262 98 018A 4353 G 20170408213339222 17 75 0857090+676916 56 S+072 10 25262 98 018A 4353 G 20170408213339302 17 75 0857209+676555 56 S+071 10 25262 98 018A 4353 G 20170408213339422 17 75 0857379+676033 56 S+071 10 STA YYday HH:MM:SS.sss AZ EL ASP XTRK deltaT Perr ( 1) 4353 17 98 21:33:39.222 328.1 68.5 73.2 0.00 0.06 0.029 ( 2) 4353 17 98 21:33:39.302 328.1 68.5 73.3 0.00 0.06 0.028 ( 3) 4353 17 98 21:33:39.422 328.0 68.6 73.3 0.00 0.06 0.028 Iridium 6 (97-020C), TLE epoch 17098.80418412: 24794 97 020C 4353 G 20170408213330782 17 75 0848465+681577 56 S+069 10 24794 97 020C 4353 G 20170408213330822 17 75 0848486+681343 56 S+070 10 24794 97 020C 4353 G 20170408213330862 17 75 0848572+681172 56 S+069 10 24794 97 020C 4353 G 20170408213330902 17 75 0849045+680959 56 S+069 10 24794 97 020C 4353 G 20170408213330942 17 75 0849057+680845 56 S+069 10 STA YYday HH:MM:SS.sss AZ EL ASP XTRK deltaT Perr ( 1) 4353 17 98 21:33:30.782 328.2 67.6 72.5 0.01 0.06 0.032 ( 2) 4353 17 98 21:33:30.822 328.1 67.6 72.6 0.00 0.06 0.028 ( 3) 4353 17 98 21:33:30.862 328.1 67.6 72.6 0.00 0.05 0.027 ( 4) 4353 17 98 21:33:30.902 328.1 67.6 72.6 0.00 0.04 0.022 ( 5) 4353 17 98 21:33:30.942 328.1 67.6 72.6 0.00 0.06 0.030 - Marco ----- Dr Marco Langbroek - SatTrackCam Leiden, the Netherlands. e-mail: sattrackcam_at_langbroek.org Cospar 4353 (Leiden): 52.15412 N, 4.49081 E (WGS84), +0 m ASL Cospar 4355 (Cronesteyn): 52.13878 N, 4.49937 E (WGS84), -2 m ASL Station (b)log: http://sattrackcam.blogspot.com Twitter: _at_Marco_Langbroek ----- _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Sun Apr 09 2017 - 15:23:07 UTC
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