Brad, Since the launch of OTV 6 I have three or four radio observations per day, so I can see every orbit change within one day. I have published updated TLEs on a regular basis. I'm absolutely certain that there have been no orbit changes. After the first visual observations Mike also started to publish TLEs that match the same orbit. Only your report of an observation about 48 s late was the only one that did not fit all other observations. Still Mike used your observation to calculate his latest TLE set. Therefore that fits your observation but it does not fit any other observations. I don't know which object you saw but it certainly was not OTV 6. Regards, NJ On 04-06-2020 20:28, Brad Young wrote: > Nico, > > Using your recent elset (shown below as 65606), I reduced my observations of June 3 and found that OTV-6 would have passed through the asterism with delta Ursa Majoris 50 seconds earlier than I reported. Not surprisingly, Mike's old elset (here as 45606) shows the same result, and his new one matches my observation. > > What is your assertion that the orbit of OTV-6 has not changed based on? Radio or visual observations? Only your own, or others? Have you reduced and reported those observations? I make mistakes, but generally not on the order of 50 seconds. If I have, it would be helpful to me to have data to compare to understand where things went wrong. Barring maneuvers, I won't have any good passes for a while, and would like to better prepared when things do improve. > > OTV 6 nico > 1 65606U 20029A 20152.06547600 0.00000000 00000-0 00000-0 0 05 > 2 65606 44.9650 245.0202 0002003 103.8909 256.1086 15.59425537 05 > OTV 6 mm1 > 1 55606U 20029A 20155.39697227 0.00000000 00000-0 00000-0 0 05 > 2 55606 44.9600 225.8792 0009003 69.1419 290.8576 15.58843137 05 > OTV 6 mm2 > 1 45606U 20029A 20156.18447800 .00005000 00000-0 63712-4 0 01 > 2 45606 45.0090 221.4883 0000003 76.5930 31.9462 15.59424514 07 > > Results: > 65606 20 029A 8336 F 20200603095128000 17 25 1218650+573198 38 S > 65606 20 029A 8336 F 20200603095038000 17 25 1218650+573198 38 S > 45606 20 029A 8336 F 20200603095128000 17 25 1218106+572700 38 S > 45606 20 029A 8336 F 20200603095128000 17 25 1218650+573198 38 S > 55606 20 029A 8336 F 20200603095128000 17 25 1218106+572700 38 S > > Deatils.txt files: > > 2020 Jun 03 09:51:28.0 UTC 20029A 65606 SGP4 > > Star A: 12:15:25.4529 +57:01:57.355 (2000.0) Mag 3.298 > Star B: 12:20:50.8815 +57:51:50.832 (2000.0) Mag 5.693 > > Object on line AB, 0.600000 from A to B; Star Sep = 1.106 deg > > Object: 12:18:39.0041 +57:31:58.900 (2000.0) +/- 0.055 deg (0.050 X Star Sep) > > Obs - Pred: 0.016 deg X-track; 47.526 s late, relative 3.35 day old elset: > > 1 65606U 20029A 20152.06547600 0.00000000 00000-0 00000-0 0 05 > 2 65606 44.9650 245.0202 0002003 103.8909 256.1086 15.59425537 05 > > 65606 20 029A 8336 F 20200603095128000 17 25 1218650+573198 38 S > > > 2020 Jun 03 09:50:38.0 UTC 20029A 65606 SGP4 > > Star A: 12:15:25.4529 +57:01:57.355 (2000.0) Mag 3.298 > Star B: 12:20:50.8815 +57:51:50.832 (2000.0) Mag 5.693 > > Object on line AB, 0.600000 from A to B; Star Sep = 1.106 deg > > Object: 12:18:39.0041 +57:31:58.900 (2000.0) +/- 0.055 deg (0.050 X Star Sep) > > Obs - Pred: 0.014 deg X-track; 0.193 s early, relative 3.34 day old elset: > > 1 65606U 20029A 20152.06547600 0.00000000 00000-0 00000-0 0 05 > 2 65606 44.9650 245.0202 0002003 103.8909 256.1086 15.59425537 05 > > 65606 20 029A 8336 F 20200603095038000 17 25 1218650+573198 38 S > > > 2020 Jun 03 09:51:28.0 UTC 20029A 45606 SGP4 > > Star A: 12:15:25.4529 +57:01:57.355 (2000.0) Mag 3.298 > Star B: 12:20:50.8815 +57:51:50.832 (2000.0) Mag 5.693 > > Object on line AB, 0.500000 from A to B; Star Sep = 1.106 deg > > Object: 12:18:06.3778 +57:26:59.932 (2000.0) +/- 0.055 deg (0.050 X Star Sep) > > Obs - Pred: 0.085 deg X-track; 44.496 s late, relative -0.77 day old elset: > > 1 45606U 20029A 20156.18447800 .00005000 00000-0 63712-4 0 01 > 2 45606 45.0090 221.4883 0000003 76.5930 31.9462 15.59424514 07 > > 45606 20 029A 8336 F 20200603095128000 17 25 1218106+572700 38 S > > > 2020 Jun 03 09:51:28.0 UTC 20029A 45606 SGP4 > > Star A: 12:15:25.4529 +57:01:57.355 (2000.0) Mag 3.298 > Star B: 12:20:50.8815 +57:51:50.832 (2000.0) Mag 5.693 > > Object on line AB, 0.600000 from A to B; Star Sep = 1.106 deg > > Object: 12:18:39.0041 +57:31:58.900 (2000.0) +/- 0.055 deg (0.050 X Star Sep) > > Obs - Pred: 0.022 deg X-track; 44.421 s late, relative -0.77 day old elset: > > 1 45606U 20029A 20156.18447800 .00005000 00000-0 63712-4 0 01 > 2 45606 45.0090 221.4883 0000003 76.5930 31.9462 15.59424514 07 > > 45606 20 029A 8336 F 20200603095128000 17 25 1218650+573198 38 S > > > 2020 Jun 03 09:51:28.0 UTC 20029A 55606 SGP4 > > Star A: 12:15:25.4529 +57:01:57.355 (2000.0) Mag 3.298 > Star B: 12:20:50.8815 +57:51:50.832 (2000.0) Mag 5.693 > > Object on line AB, 0.500000 from A to B; Star Sep = 1.106 deg > > Object: 12:18:06.3778 +57:26:59.932 (2000.0) +/- 0.055 deg (0.050 X Star Sep) > > Obs - Pred: 0.041 deg X-track; 0.098 s late, relative 0.01 day old elset: > > 1 55606U 20029A 20155.39697227 0.00000000 00000-0 00000-0 0 05 > 2 55606 44.9600 225.8792 0009003 69.1419 290.8576 15.58843137 05 > > 55606 20 029A 8336 F 20200603095128000 17 25 1218106+572700 38 S > > Brad Young PE > Visual: > Oberwerk 8 x 40 Mariner binoculars > Meade ETX-125 > 22" f/4.2 UC Obsession > COSPAR 8336 =TULSA1 +36.139208,-95.983429 660ft, 201m > COSPAR 8335 =TULSA2 +35.8311 -96.1411 1083ft, 330m > Remote Imaging: > MPC I89 COSPAR 7777 38.165653 -2.326735 5150ft, 1650m Nerpio, Spain > MPC Q62 COSPAR 7778 -31.2733 149.0644 3400ft, 1122m Siding Spring, NSW, Australia > MPC H06 COSPAR 7779 32.92 -105.528 7298ft, 2225m Mayhill, New Mexico USA > MPC 323 COSPAR 7782 -32.008 116.135 984ft, 300m Perth, WA, Australia > > > > > > > On Thursday, June 4, 2020, 7:15:53 AM CDT, Nico Janssen via Seesat-l <seesat-l_at_satobs.org> wrote: > > > > > > > OTV 6 has not performed any maneuvers (yet). > It is still in its original orbit: > > OTV 6 > 1 45606U 20029A 20156.18447800 .00005000 00000-0 63712-4 0 01 > 2 45606 45.0090 221.4883 0000003 76.5930 31.9462 15.59424514 07 > > NJ > > > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Thu Jun 04 2020 - 13:53:12 UTC
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