Author Topic: LIVE: SpaceX Falcon 9 v1.1 - CASSIOPE - Sept. 29 - LAUNCH UPDATES  (Read 231522 times)

Offline Lars_J

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May I raise the point that the videos from South Africa and Mauritius show a symmetric expanding cloud, what might be expected from a stable dispenser. This is markedly unlike the spiral clouds painted by
tumbling stages. Is that a clue that no energetic event disturbed the orientation of the second stage?

That sounds reasonable, but I'm no expert.

Offline JimO

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Jim, I thought the spiral patterns where due to a stage firing while tumbling...

There are several ways to make space spirals:

1. Tumbling thrusting rockets, e.g. a Chinese 'UFO' where the plume actually reverses rotation sense halfway through...

2. Spinning solid-fuel stages doing 'momentum dumping' on less-than-max-range test flights, usually by opening and then closing two opposite-facing thrust chamber ports, e.g., Norway spiral, Dec 2009.

3. ICBM MIRV bus spin-up post shutdown -- usually a 3 to 5 second burst of laterally-mounted thrusters, seen on several recent KY to Sary Shagan ICBM flights.

4. Post-insertion fuel dump with stage slow tumble, eg some deep-space Cemtaur purges, and Falcon-9 over east Australia, June 2010, and the 'great east coast UFO' of 1986 [Japanese H-2 stage], etc.

I'm sure there are other ways....

Offline Lars_J

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A tweet from James Dean, reporter at Florida Today: https://twitter.com/flatoday_jdean/status/385079753922736128

Quote
James Dean
‏@flatoday_jdean

SpaceX statement re. speculation about F9 upper stage anomaly: "our data confirms there was no rupture of any kind on the second stage."

Offline edkyle99

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How do you do this actually? Is there a quick and dirty calculation that can be performed?

http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/SSOP_Help/tle_def.html

btw. Space-Track TLE's are not supposed to be posted. Though, posting the catalog number and what Ed posted are fair game.
This didn't come from Space-Track.  It came from the DANDE web site!  It is presented as an "in house TLE".

 - Ed Kyle

Offline gospacex

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Are there any videos of retro burn?

Offline Lars_J

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Are there any videos of retro burn?

Not yet, but if you look at this video, you can see what appears to be the 1st stage thrusters turning it around. (at 4:40)

Offline mlindner

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How do you do this actually? Is there a quick and dirty calculation that can be performed?

http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/SSOP_Help/tle_def.html

btw. Space-Track TLE's are not supposed to be posted. Though, posting the catalog number and what Ed posted are fair game.

Non-functional because the government is shut down lol... Looks like they took all of NASA.gov down. Didn't know a website running depended on people actually being there, unless they shut off power.
Internal combustion engine in space. It's just a Bad Idea.TM - Robotbeat

Offline justineet

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How do you do this actually? Is there a quick and dirty calculation that can be performed?

http://spaceflight.nasa.gov/realdata/sightings/SSapplications/Post/JavaSSOP/SSOP_Help/tle_def.html

btw. Space-Track TLE's are not supposed to be posted. Though, posting the catalog number and what Ed posted are fair game.
This didn't come from Space-Track.  It came from the DANDE web site!  It is presented as an "in house TLE".

 - Ed Kyle

The speculation is unlikely because the upper stage was photographed over South Africa venting off unused fuel about an hour after launch.....https://twitter.com/RavenXV/status/384668909007155200/photo/1
« Last Edit: 10/01/2013 06:52 PM by justineet »

Offline mr. mark

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« Last Edit: 10/01/2013 07:12 PM by mr. mark »

Offline input~2

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Online king1999

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http://www.space.com/23023-spacex-falcon-9-from-vandenberg-afb-near-perfect-video.html

US Airforce personel commentary on the launch.
What did they mean there was no countdown?
They didn't watch the webcast?
Weird the launch caught the reporters by surprise.

Offline Lars_J

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"No Upper-stage Explosion after Falcon 9 v1.1 Launch, SpaceX Says"
http://www.spacenews.com/article/launch-report/37498no-upper-stage-explosion-after-falcon-9-v11-launch-spacex-says


The SpaceX quote from that article: (thanks!)

Quote
"Following separation of the satellites to their correct orbit, the Falcon 9 second stage underwent a controlled venting of propellants (fuel and pressure were released from the tank) and the stage was successfully safed. During this process, it is possible insulation came off the fuel dome on the second stage and is the source of what some observers incorrectly interpreted as a rupture in the second stage. This material would be in several pieces and be reflective in the Space Track radar. It is also possible the debris came from the student satellite separation mechanisms onboard.

SpaceX will continue to review to help identify the source of the extra debris, but our data confirms there was no rupture of any kind on the second stage."

Online ugordan

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There's a related article to this video and it says the PA system at the site was apparently carrying the engineering net and not the countdown net so that's why they didn't hear a countdown. Don't know where they got the idea the launch was supposed to go off at 09:21, though.

Offline Lars_J

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There's a related article to this video and it says the PA system at the site was apparently carrying the engineering net and not the countdown net so that's why they didn't hear a countdown. Don't know where they got the idea the launch was supposed to go off at 09:21, though.

Here is the article: http://www.space.com/23009-spacex-falcon-9-rocket-launch-test-first-person.html

Offline laika_fr

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looks like a velocity burn if you ask me
a shrubbery on Mars

Offline Lars_J

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It is hard to tell where you captured that from - but it looks like the 2nd stage ignition.
« Last Edit: 10/01/2013 08:08 PM by Lars_J »

Offline Chris Bergin

Recording and transcript of the post launch presser now in L2.

http://forum.nasaspaceflight.com/index.php?topic=31448.msg1104571#msg1104571 (L2 Link)

We're going to create some articles out of it.

Offline laika_fr

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Lars, from the above video, zoom 250%, if the halo means m-vac ignition, this comes after.
a shrubbery on Mars

Offline mlindner

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http://www.space.com/23023-spacex-falcon-9-from-vandenberg-afb-near-perfect-video.html

US Airforce personel commentary on the launch.

If only Space.com would get with the modern era and use HD video with reasonable bitrate.
Internal combustion engine in space. It's just a Bad Idea.TM - Robotbeat

Offline InfraNut2

The new NSF article on the next F9 v.1.1 flight quoted Elon as saying:

Quote
“We essentially saw the engine initiate ignition, get up to about 400 psi and then it encountered a condition that it didn’t like. It may have been due to an extended spin start, maybe, but this is speculative. So it initiated an abort of the restart. But we have all of the data.

“Before deciding what the issue was, I think we want a bit more time to read the data, before coming to a conclusion,”

Please take any technical discussion of this to the discussion thread.

EDIT: fixed discussion thread link.
« Last Edit: 10/03/2013 10:07 AM by InfraNut2 »

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