Author Topic: SpaceX F9 : CRS SpX-19 : December 5, 2019 - DISCUSSION (Read 61156 times)

Rondaz · « **Reply #60 on:** 12/03/2019 02:32 pm »

.@SpaceX’s Dragon spacecraft will race into the sky Wednesday carrying tons of cargo, supplies & research to the @Space_Station.

https://twitter.com/NASA/status/1201637419726049282

Wolfram66 · « **Reply #61 on:** 12/03/2019 02:43 pm »

Quote from: Rondaz on 12/01/2019 01:50 am

Weather is 90% go for the #SpaceX #CRS19 launch to the International Space Station on December 4th. Liftoff is scheduled for 12:51 EST (17:51 UTC).

https://twitter.com/nextspaceflight/status/1200904755368755200

Will mid level shear be an issue?
http://tropic.ssec.wisc.edu/real-time/windmain.php?&basin=atlantic&sat=wg8&prod=midshr&zoom=&time=

pochimax · « **Reply #62 on:** 12/03/2019 02:51 pm »

Quote from: Comga on 12/03/2019 01:01 pm

The elapsed time for the CRS-19 second stage reentry is not much shorter than the time to coast from LEO to GEO.
If and when I get the time it seems obvious to compare the delta-V of that ~6 degree plane change (guess:0.6 km/sec) to a GTO injection burn.
If we see a second stage deorbit burn it would indicate that this is a test of direct injection into GEO. Somewhat like the first Heavy launch.

What is the longest FH-F9 second stage coast duration to date?

Maybe, are they trying to demonstrate TLI capabilities for the Gateway logistics contract?

gongora · « **Reply #63 on:** 12/03/2019 02:56 pm »

Quote from: pochimax on 12/03/2019 02:51 pm

What is the longest FH-F9 second stage coast duration to date?

Wasn't FH Demo about 6 hours?

pochimax · « **Reply #64 on:** 12/03/2019 03:54 pm »

I think 3rd Falcon Heavy, STP-2 mission, had SECO-4 at 03:28:03 after launch.

Quote

Wasn't FH Demo about 6 hours?

Oh, yes, you are correct, i checked it. My fault.

Rondaz · « **Reply #65 on:** 12/03/2019 05:23 pm »

Tune in to SpaceX CRS-19 Prelaunch News Conference

Danielle Sempsrott Posted on December 3, 2019

Tune in to NASA TV and the agency’s website at 1:30 p.m. EST today to watch the NASA Social What’s on Board science briefing, highlighting some of the research that will take place on CRS-19, airing from the agency’s Kennedy Space Center in Florida. Then, stay tuned for the prelaunch news conference, beginning at 4 p.m., and hear from officials with the International Space Station Program Science Office, SpaceX and the U.S. Air Force 45th Space Wing.

Launch of SpaceX’s 19th Commercial Resupply Services (CRS-19) mission to the International Space Station is scheduled for Wednesday, Dec. 4, at 12:51 p.m. EST. The company’s Falcon 9 rocket will lift off from Space Launch Complex 40 at Cape Canaveral Air Force Station, carrying the Dragon spacecraft that will deliver supplies, equipment and material to the space station. Dragon is slated to arrive at the station on Dec. 7 and will be captured by Expedition 61 crewmembers. Following capture, ground controllers will take over to install the spacecraft to the Harmony module’s Earth-facing port.

Learn more about some of the research and experiments taking place on CRS-19 at: https://www.nasa.gov/mission_pages/station/research/news/spx19-research

https://blogs.nasa.gov/spacex/2019/12/03/tune-in-to-spacex-crs-19-prelaunch-news-conference/

AndrewRG10 · « **Reply #66 on:** 12/03/2019 08:36 pm »

Jessica said they are testing long coasting as we guessed, as she cant twlk anout who it is for im guessing its for the US air force and their GEO mission on Falcon heavy next year.

Comga · « **Reply #67 on:** 12/04/2019 01:19 am »

Quote from: gongora on 12/03/2019 02:56 pm

Quote from: pochimax on 12/03/2019 02:51 pm
What is the longest FH-F9 second stage coast duration to date?

Wasn't FH Demo about 6 hours?

Yes

Quote from: Steven Pietrobon on 02/07/2018 01:44 am

T+5 hours 58 minutes. We're past perigee at 180 km and 7.8 km/s. The burn should be happening now.

FutureSpaceTourist · « **Reply #68 on:** 12/04/2019 06:10 am »

Tim Dodd is doing his own CRS-19 live stream

https://twitter.com/erdayastronaut/status/1202078046473379842

Quote

Join me tomorrow and let's watch @SpaceX send a Dragon Capsule to the ISS for @NASA! This will be the ONE YEAR ANNIVERSARY exactly of CRS-16 which left a brand new Block 5 Falcon 9 booster a little wet! Let's see if SpaceX will nail this landing! -

FutureSpaceTourist · « **Reply #69 on:** 12/04/2019 12:01 pm »

Live stream

Prettz · « **Reply #70 on:** 12/04/2019 03:26 pm »

What exactly is a "thermal demonstration"? Any educated guesses?

wannamoonbase · « **Reply #71 on:** 12/04/2019 03:38 pm »

Quote from: pochimax on 12/03/2019 02:51 pm

Quote from: Comga on 12/03/2019 01:01 pm
The elapsed time for the CRS-19 second stage reentry is not much shorter than the time to coast from LEO to GEO.
If and when I get the time it seems obvious to compare the delta-V of that ~6 degree plane change (guess:0.6 km/sec) to a GTO injection burn.
If we see a second stage deorbit burn it would indicate that this is a test of direct injection into GEO. Somewhat like the first Heavy launch.
What is the longest FH-F9 second stage coast duration to date?

Maybe, are they trying to demonstrate TLI capabilities for the Gateway logistics contract?

I'm curious if they are doing any burns after Dragon separation?

Maybe raise the orbit then 6 hours later lower it for disposal.

Without Dragon it would be so light it would really go places!

Herb Schaltegger · « **Reply #72 on:** 12/04/2019 03:44 pm »

Quote from: Prettz on 12/04/2019 03:26 pm

What exactly is a "thermal demonstration"? Any educated guesses?

If you’re referring to the test to be performed with the upper stage, it’s demonstrating that the stage can maintain thermal control during an extended coast (e.g., not developing localized cold spots and fuel gelling, and not developing hot spots and increased oxidizer boil-off. Extended upper stage coasts are necessary for some mission profiles (specifically, direct GEO insertion missions for government payloads).

Chris Bergin · « **Reply #73 on:** 12/04/2019 03:48 pm »

https://twitter.com/ChrisG_NSF/status/1202268288631349248

kevin-rf · « **Reply #74 on:** 12/04/2019 04:11 pm »

mjcrsmith · « **Reply #75 on:** 12/04/2019 04:16 pm »

Has there been a previous SpaceX launch for NASA that scrubbed due to landing conditions rather than launch conditions?

It used to be that landing conditions did not have any impact on launching.

ZachS09 · « **Reply #76 on:** 12/04/2019 04:20 pm »

Quote from: mjcrsmith on 12/04/2019 04:16 pm

Has there been a previous SpaceX launch for NASA that scrubbed due to landing conditions rather than launch conditions?

It used to be that landing conditions did not have any impact on launching.

SpX-17 was scrubbed because of a technical problem on the drone ship.

Prettz · « **Reply #77 on:** 12/04/2019 04:27 pm »

Quote from: Herb Schaltegger on 12/04/2019 03:44 pm

Quote from: Prettz on 12/04/2019 03:26 pm
What exactly is a "thermal demonstration"? Any educated guesses?
If you’re referring to the test to be performed with the upper stage, it’s demonstrating that the stage can maintain thermal control during an extended coast (e.g., not developing localized cold spots and fuel gelling, and not developing hot spots and increased oxidizer boil-off. Extended upper stage coasts are necessary for some mission profiles (specifically, direct GEO insertion missions for government payloads).

And this is different from what they had already demonstrated? Or just a continuation of the same?

zubenelgenubi · « **Reply #78 on:** 12/04/2019 04:46 pm »

We've got a substantial number of worldwide orbital goings-on in succession coming up (as of this posting):

Dragon launches tomorrow

Electron launches from New Zealand on 12/6 UTC

Progress MS-13 launches from Baikonur on 12/6 UTC

2 KZ-1A launches from Taiyuan within 6 hours on 12/7 UTC

Dragon capture and berthing on 12/8 UTC

Progress MS-13 docks on 12/9 UTC

Another Glonass-M launches from Plesetsk on 12/10 UTC

RISAT-2BR1 launches from Sriharikota on 12/11 UTC

meekGee · « **Reply #79 on:** 12/04/2019 05:21 pm »

Quote from: mjcrsmith on 12/04/2019 04:16 pm

Has there been a previous SpaceX launch for NASA that scrubbed due to landing conditions rather than launch conditions?

It used to be that landing conditions did not have any impact on launching.

Second time already, the industry is just going to hell in a hand-basket