Author Topic: SpaceX Falcon 9 : AMOS-17 : August 6, 2019 : DISCUSSION (Read 76274 times)

Thorny · « **Reply #100 on:** 08/06/2019 03:09 pm »

I hope someone (SpaceX, ULA, USAF) has flown a helicopter or drone in the area to get nice photos of both Falcon 9 and Atlas 5 exposed on their launch pads this morning.

jpo234 · « **Reply #101 on:** 08/06/2019 04:19 pm »

https://twitter.com/AMOSSpacecom/status/1153329522927951875

https://twitter.com/AMOSSpacecom/status/1154036674583601153

https://twitter.com/AMOSSpacecom/status/1154391072233218048

https://twitter.com/AMOSSpacecom/status/1154447882604429313

https://twitter.com/AMOSSpacecom/status/1154629761341304832

https://twitter.com/AMOSSpacecom/status/1156175009607499776

billh · « **Reply #102 on:** 08/06/2019 04:58 pm »

Quote from: Thorny on 08/06/2019 03:09 pm

I hope someone (SpaceX, ULA, USAF) has flown a helicopter or drone in the area to get nice photos of both Falcon 9 and Atlas 5 exposed on their launch pads this morning.

This is what a spaceport should look like!

intelati · « **Reply #103 on:** 08/06/2019 09:07 pm »

Current Radar 5:03pm EDT/9:03pm UTC

zubenelgenubi · « **Reply #104 on:** 08/06/2019 11:35 pm »

There was no live footage from the first stage after separation. I hope we'll see as much as possible of the rocketcam view of re-entry sometime later.

Also, did the second stage first burn go a few seconds long?

Lars-J · « **Reply #105 on:** 08/06/2019 11:37 pm »

Quote from: zubenelgenubi on 08/06/2019 11:35 pm

There was no live footage from the first stage after separation. I hope we'll see as much as possible of the rocketcam view of re-entry sometime later.

Also, did the second stage first burn go a few seconds long?

This first stage was expended. I don't expect to see any footage from it. Looked like grid fins and camera package was removed from the interstage.

jstrotha0975 · « **Reply #106 on:** 08/06/2019 11:44 pm »

Will their be a fairing recovery attempt?

Lars-J · « **Reply #107 on:** 08/06/2019 11:46 pm »

Quote from: jstrotha0975 on 08/06/2019 11:44 pm

Will their be a fairing recovery attempt?

Yes. But not shown on the live stream. They will announce the result of the attempt on social media.

ZachS09 · « **Reply #108 on:** 08/06/2019 11:49 pm »

There technically was an interstage camera that showed us the last half-minute of Stage 1 powered flight before cutting to the M-Vac engine.

Lars-J · « **Reply #109 on:** 08/06/2019 11:53 pm »

Quote from: ZachS09 on 08/06/2019 11:49 pm

There technically an interstage camera that showed us the last half-minute of Stage 1 powered flight before cutting to the M-Vac engine.

Oh, good point. I assumed that was the 2nd stage camera, but probably not.

RDMM2081 · « **Reply #110 on:** 08/06/2019 11:56 pm »

Quote from: Steven Pietrobon on 08/06/2019 11:55 pm

Separation!

Congrats to SpaceX getting this one done and keeping SpaceCom/AMOS happy!

gongora · « **Reply #111 on:** 08/07/2019 12:00 am »

Over two months to the next Falcon launch (assuming no surprises), hopefully the withdrawal symptoms aren't too severe. At least we'll get some Hopper action and Starship news to tide us over.

Steven Pietrobon · « **Reply #112 on:** 08/07/2019 12:10 am »

Congratulations to SpaceX and AMOS for the successful launch!

Stage 2 second cutoff was 35,295 km/h (9804.2 m/s) and 209 km. My calculator gives an apogee of 35,508 km, 278 km below geosynchronous at 35,786 km. Delta-V to geo is 1840.5 m/s.

http://www.sworld.com.au/steven/space/speed.zip

Enter initial perigee height (km): 209
Enter SpaceX speed (km/h): 35295
Enter initial orbit inclination (deg): 28.5

Estimated inertial speed = 10226.3 m/s
Estimated apogee height = 35508.1 km

Enter required inclination change (deg): 28.5
Enter final orbit height (km): -1
Geosynchronous altitude = 35786.0 km

Burn at 209.0 km: theta1 = 0.00 deg, dv1 = 4.6 m/s
Burn at 35786.0 km: theta2 = 28.50 deg, dv2 = 1835.9 m/s
dv = 1840.5 m/s

LouScheffer · « **Reply #113 on:** 08/07/2019 12:12 am »

On the webcast, John said they would add 2.6 km/sec to the orbital speed, more than enough to reach GEO apogee. I'm guessing they used the rest to reduce inclination. You can do slightly better with a super-synchronous apogee but it's only a few m/s and likely not worth the extra complexity. Inclination reduction is also consistent with the final measured Earth-relative velocity of 35295 km/hr.

So my guess is 220 km x 36000 km, inclined 22^o. 1700 m/s to get to GEO.

EDIT: Added some forgotten units.

ejb749 · « **Reply #114 on:** 08/07/2019 01:34 am »

Fairing caught.
https://twitter.com/elonmusk/status/1158899839456800769?s=19

Alexphysics · « **Reply #115 on:** 08/07/2019 02:16 am »

Quote from: Lars-J on 08/06/2019 11:37 pm

Quote from: zubenelgenubi on 08/06/2019 11:35 pm
There was no live footage from the first stage after separation. I hope we'll see as much as possible of the rocketcam view of re-entry sometime later.

Also, did the second stage first burn go a few seconds long?

This first stage was expended. I don't expect to see any footage from it. Looked like grid fins and camera package was removed from the interstage.

Camera was not removed, during ascent we were able to get views of the rocket going up with that camera

Ogrepete · « **Reply #116 on:** 08/07/2019 03:40 pm »

I haven't seen an explanation (despite looking around) of why the range went Red and then Green within about 90 seconds.

Does anyone know the details behind that set of events?

RocketLover0119 · « **Reply #117 on:** 08/07/2019 03:41 pm »

Watched the launch in person, my first falcon launch in person, was one of the coolest things i've ever experienced in my life, the atmosphere, the launch itself, the roar of the merlins, and the rocket itself......WOW......

ZachS09 · « **Reply #118 on:** 08/07/2019 04:29 pm »

Has anyone found the TLEs for AMOS 17 yet?

I'd like to know the delta-v to GTO for this mission.

penguin44 · « **Reply #119 on:** 08/07/2019 05:50 pm »

Quote from: Ogrepete on 08/07/2019 03:40 pm

I haven't seen an explanation (despite looking around) of why the range went Red and then Green within about 90 seconds.

Does anyone know the details behind that set of events?

I believe when I heard it in headphones, that someone was saying range was red in error and needed to be changed in the computer before the t-1:30 mark.