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#380
by
FutureSpaceTourist
on 31 Aug, 2020 02:53
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#381
by
FutureSpaceTourist
on 31 Aug, 2020 03:01
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#382
by
FutureSpaceTourist
on 31 Aug, 2020 03:04
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#383
by
FutureSpaceTourist
on 31 Aug, 2020 03:25
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#384
by
OneSpeed
on 31 Aug, 2020 04:38
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Here is the telemetry from the SAOCOM-1B mission. Some points of interest are:
1. A small amount of the dogleg manoeuvre was accomplished by the first stage, as you can see from the attached still of MECO from the Mission Control Audio video.
2. On the mission video you can see the second stage yaw manoeuvre stop at the T+03:30 (210s) mark, and this coincides with the increase in acceleration at 210s in the plot.
3. The mission profile used direct injection to a nearly circular orbit of 620 x 603km. I had mistakenly assumed the payload would be too heavy for direct injection, and assumed MECO would occur about 70km downrange. MECO was actually much closer to 40km downrange, and so I've attached my predicted and corrected ground tracks below.
4. The second stage throttled back quite substantially from the 360s mark until SECO.
5. There is a data glitch at 560s that can safely be ignored.
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#385
by
catdlr
on 31 Aug, 2020 05:24
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I don’t know if this is the correct thread but it does pertain to this thread.
Did anybody notice the following?
Before the launch 1 (I believe it is the more northern antenna) of the 2 tracking antennas in Boca Chica was pointed what looked to be due east, toward Florida. The 2nd antenna (the more southern of the 2) was at Nader.
This changed shortly before launch. The northern antenna went to Nader and the southern antenna was now pointed east. At launch, the southern antenna appeared to track an object traveling south on the horizon. At about this time there was a call out for Texas acquisition of signal. The antenna appeared to track until it was west of due south. The antenna paused for a considerable amount of time then changed its orientation as if to pick up tracking and object east of due north. It now appears to be tracking an object on the horizon traveling south.
At 5:07 into the mission, mission audio announced that South Texas had acquisition.
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#386
by
FutureSpaceTourist
on 31 Aug, 2020 05:36
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#387
by
Star One
on 31 Aug, 2020 07:02
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Archived mission video:
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#388
by
input~2
on 31 Aug, 2020 07:26
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3 objects have been cataloged
2020-059A/46265 in 606 x 612 km x 97.88°
2020-059B/46266 in 601 x 608 km x 97.88°
2020-059C/46267 in 598 x 610 km x 97.88°
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#389
by
KTigress
on 31 Aug, 2020 07:53
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Here is the telemetry from the SAOCOM-1B mission. Some points of interest are:
1. A small amount of the dogleg manoeuvre was accomplished by the first stage, as you can see from the attached still of MECO from the Mission Control Audio video.
2. On the mission video you can see the second stage yaw manoeuvre stop at the T+03:30 (210s) mark, and this coincides with the increase in acceleration at 210s in the plot.
3. The mission profile used direct injection to a nearly circular orbit of 620 x 603km. I had mistakenly assumed the payload would be too heavy for direct injection, and assumed MECO would occur about 70km downrange. MECO was actually much closer to 40km downrange, and so I've attached my predicted and corrected ground tracks below.
4. The second stage throttled back quite substantially from the 360s mark until SECO.
5. There is a data glitch at 560s that can safely be ignored.
What does each colour represent in the predicted/actual groundtracks?
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#390
by
OneSpeed
on 31 Aug, 2020 08:46
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What does each colour represent in the predicted/actual groundtracks?
Congratulations on the launch! The red ground track and landing area is in case of a failed boostback burn of the booster. The orange ground track and landing area is for the fairing halves. The yellow line is the second stage ground track.
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#391
by
KTigress
on 31 Aug, 2020 09:10
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What does each colour represent in the predicted/actual groundtracks?
Congratulations on the launch! The red ground track and landing area is in case of a failed boostback burn of the booster. The orange ground track and landing area is for the fairing halves. The yellow line is the second stage ground track.
Thanks!!
We had some free time in between passes in the Engineering Support Room and discussed the launch trajectory using your ground tracks. We don’t have this kind of plot readily available!
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#392
by
FutureSpaceTourist
on 31 Aug, 2020 12:53
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https://twitter.com/nasa_nerd/status/1300414706109296642 Southbound with SAOCOM-1B 🚀
SpaceX Falcon 9 B1059.4 makes a historic step and dashes south, completing the first polar launch from Cape Canaveral since 1969.
Mission Story: nasaspaceflight.com/2020/08/spacex…
📸 A @ChrisG_NSF & @NASA_Nerd production.
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#393
by
FutureSpaceTourist
on 31 Aug, 2020 14:02
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https://twitter.com/spacexfleet/status/1300427524518875136 Ms. Chief was underway from the SAOCOM 1B LZ by 2am ET this morning.
Because of the inconsistent reporting by Ms. Chief's tracker, it will be extremely difficult for me to provide ETA updates. I will try my best...
SpaceX has not provide any updates on fairing recovery yet.
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#394
by
FutureSpaceTourist
on 31 Aug, 2020 14:35
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#395
by
abaddon
on 31 Aug, 2020 14:44
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Pretty interesting stuff; you can clearly see from the planned ground track and actual ground track how the booster swung out in a more easterly direction, presumably to avoid the Delta IV Heavy sitting on the pad. From @OneSpeed's excellent plot you can also get an inkling what it cost in performance as the booster and s2 'wasted' time on yaw steering. Seems clear the original trajectory would have been more optimal but the Falcon 9 had enough performance to spare that SpaceX was willing to sacrifice some margin to get the flight off now instead of waiting. I guess we can add "operational flexibility" as another (small) benefit of an 'overpowered' launch system rather than one tailored via solid augmentation to the specific mission. A lot to unpack here.
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#396
by
leetdan
on 31 Aug, 2020 14:49
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#397
by
Ronsmytheiii
on 31 Aug, 2020 15:07
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#398
by
freda
on 31 Aug, 2020 15:16
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Has anyone seen or heard any reports of sightings from the Miami area? You know, similar to the numerous reports posted from similar Vandenburg launches that go near a populated area. I have looked around, but have not seen any. Too cloudy or overcast perhaps?
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#399
by
AC in NC
on 31 Aug, 2020 15:46
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Has there been any chatter about the sonic booms? The reentry was heard in my neighborhood 40 miles inland, which was outside any of the graphics that I'd seen posted.
Aren't the graphics diagramming specific dB levels?
We had some free time in between passes in the Engineering Support Room and discussed the launch trajectory using your ground tracks. We don’t have this kind of plot readily available!