Author Topic: SpaceX F9 : Iridium NEXT 6 with GRACE-FO : NET May 22, 2018 - DISCUSSION  (Read 112902 times)

Online ZachS09

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The second stage camera looked worse than ever. What's the deal with that?

My best guess is that the bolts holding the camera to the fixture were inadvertently loosened, causing the camera to vibrate.
Liftoff for St. Jude's! Go Dragon, Go Falcon, Godspeed Inspiration4!

Offline SciNews

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SpaceX and NASA feeds

Offline Mongo62

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It's in Jell-O-Vision!

Online AllenB

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The second stage camera looked worse than ever. What's the deal with that?

Appeared to be switching between two cameras, one good and one... shaky. So probably nothing worse than a bad camera.

Offline Lars-J

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The second stage camera looked worse than ever. What's the deal with that?

My best guess is that the bolts holding the camera to the fixture were inadvertently loosened, causing the camera to vibrate.

Based on the wider angle of view, these are the same (not so great) cameras that the block 5 upper stage used. They also vibrated quite a bit) This might actually be a block 5 upper stage.

Taken together with the worst tracking camera footage ever(?), the video quality from this mission is a bit lacking.  :)
« Last Edit: 05/22/2018 08:14 pm by Lars-J »

Offline Prettz

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The second stage camera looked worse than ever. What's the deal with that?

My best guess is that the bolts holding the camera to the fixture were inadvertently loosened, causing the camera to vibrate.
No, not vibration. I mean the picture looked like crap on both cameras. Not at all like previous broadcasts, and actually worse than the Block 5 launch, which was also dramatically worse than previous launches.

Offline Lars-J

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The second stage camera looked worse than ever. What's the deal with that?

My best guess is that the bolts holding the camera to the fixture were inadvertently loosened, causing the camera to vibrate.
No, not vibration. I mean the picture looked like crap on both cameras. Not at all like previous broadcasts, and actually worse than the Block 5 launch, which was also dramatically worse than previous launches.

It looked about the same (just as bad) as the block 5 launch, IMO. The difference is most likely due to different lighting conditions due to local time of day and direction of launch.
« Last Edit: 05/22/2018 08:29 pm by Lars-J »

Online ZachS09

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I don't know about why the quality was terrible because I'm not a camera expert.
Liftoff for St. Jude's! Go Dragon, Go Falcon, Godspeed Inspiration4!

Offline whitelancer64

Nice launch!!

Also a NEW RECORD for SpaceX - the shortest turnaround for a previously flown booster:

135 days.
« Last Edit: 05/22/2018 08:31 pm by whitelancer64 »
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Offline Comga

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Separate subject.
Sometime before launch, during LOX loading, there was significant venting from the TEL.  Big vapor clouds.
Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.
My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.
It was not a judgment,   I was not saying anything was wrong or unexpected.  It's just something I had not noticed before.
I was told that any LOX being released would be a safety issue and wouldn't happen.

Does anyone here have insight into the nature of this?

When the webcast is up on YouTube perhaps a screenshot can be captured.


What kind of wastrels would dump a perfectly good booster in the ocean after just one use?

Offline whitelancer64

Separate subject.
Sometime before launch, during LOX loading, there was significant venting from the TEL.  Big vapor clouds.
Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.
My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.
It was not a judgment,   I was not saying anything was wrong or unexpected.  It's just something I had not noticed before.
I was told that any LOX being released would be a safety issue and wouldn't happen.

Does anyone here have insight into the nature of this?

When the webcast is up on YouTube perhaps a screenshot can be captured.

Occasional large vents have been seen before. What you're describing doesn't sound unusual.
"One bit of advice: it is important to view knowledge as sort of a semantic tree -- make sure you understand the fundamental principles, ie the trunk and big branches, before you get into the leaves/details or there is nothing for them to hang on to." - Elon Musk
"There are lies, damned lies, and launch schedules." - Larry J

Offline Comga

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Separate subject.
Sometime before launch, during LOX loading, there was significant venting from the TEL.  Big vapor clouds.
Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.
My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.
It was not a judgment,   I was not saying anything was wrong or unexpected.  It's just something I had not noticed before.
I was told that any LOX being released would be a safety issue and wouldn't happen.

Does anyone here have insight into the nature of this?

When the webcast is up on YouTube perhaps a screenshot can be captured.

Occasional large vents have been seen before. What you're describing doesn't sound unusual.

Not a large vent cloud.
Something solid or liquid and cold.  Dense enough to fall like a stone but dissipating as it falls.
Again, I am not saying it's bad or different, just something I have not noticed on previous launches.
Have been told it cannot be LOX.
But what could it be?

edit:  The YouTube video starts at under T-1:00 so doesn't go back far enough to see this.
« Last Edit: 05/22/2018 09:36 pm by ChrisGebhardt »
What kind of wastrels would dump a perfectly good booster in the ocean after just one use?

Offline whitelancer64

Separate subject.
Sometime before launch, during LOX loading, there was significant venting from the TEL.  Big vapor clouds.
Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.
My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.
It was not a judgment,   I was not saying anything was wrong or unexpected.  It's just something I had not noticed before.
I was told that any LOX being released would be a safety issue and wouldn't happen.

Does anyone here have insight into the nature of this?

When the webcast is up on YouTube perhaps a screenshot can be captured.

Occasional large vents have been seen before. What you're describing doesn't sound unusual.

Not a large vent cloud.
Something solid or liquid and cold.  Dense enough to fall like a stone but dissipating as it falls.
Again, I am not saying it's bad or different, just something I have not noticed on previous launches.
Have been told it cannot be LOX.  (Even had the comment edited out by a mod, as is his right.)
But what could it be?

A screenshot would help.
"One bit of advice: it is important to view knowledge as sort of a semantic tree -- make sure you understand the fundamental principles, ie the trunk and big branches, before you get into the leaves/details or there is nothing for them to hang on to." - Elon Musk
"There are lies, damned lies, and launch schedules." - Larry J

Offline Ben the Space Brit

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Interesting to see the lights of Arabia and Turkey flowing under the U/S as it flew overhead and just a touch of sunrise at the very end before the end of the webcast.

Also interesting to see the LOX vent at the top of the M-VAC engine bell clogging with a solid O2 'snowball' after SECO2.
« Last Edit: 05/22/2018 09:04 pm by Ben the Space Brit »
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Offline Steven Pietrobon

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Congratulations to SpaceX, Iridium, GFZ and NASA for the successful launch!

Captures of fairing separation.
« Last Edit: 05/22/2018 09:32 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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The second burn went from 27,443 to 27,581 km/h, a delta-V of only 38.3 m/s.
« Last Edit: 05/22/2018 09:53 pm by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline gongora

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The second burn went from 27,443 to 27,581 km/h, a delta-V of only 38.3 m/s.

Was it just an inclination change?

Online ZachS09

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The second burn went from 27,443 to 27,581 km/h, a delta-V of only 38.3 m/s.

Was it just an inclination change?

I believe it also raised the apogee to 625 kilometers.
Liftoff for St. Jude's! Go Dragon, Go Falcon, Godspeed Inspiration4!

Offline Herb Schaltegger

Separate subject.
Sometime before launch, during LOX loading, there was significant venting from the TEL.  Big vapor clouds.
Something comes out along with the vapor, arcing downward under gravity, leaving more vapor trails behind.
My guess, posted to the UPDATES thread, was that it was bits of LOX being spewed.
It was not a judgment,   I was not saying anything was wrong or unexpected.  It's just something I had not noticed before.
I was told that any LOX being released would be a safety issue and wouldn't happen.

Does anyone here have insight into the nature of this?

When the webcast is up on YouTube perhaps a screenshot can be captured.

Occasional large vents have been seen before. What you're describing doesn't sound unusual.

Not a large vent cloud.
Something solid or liquid and cold.  Dense enough to fall like a stone but dissipating as it falls.
Again, I am not saying it's bad or different, just something I have not noticed on previous launches.
Have been told it cannot be LOX.
But what could it be?

edit:  The YouTube video starts at under T-1:00 so doesn't go back far enough to see this.

I've seen the same thing on recent launches. Looks like a spurt of LOX that evaporates as it falls. Watch the last several minutes of the last few launches; I'm sure you'll see something similar on at least one or two of them. Visibility and apparent size of the vent event almost certainly depends greatly on ambient temperature, humidity and lighting.
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Offline envy887

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The second burn went from 27,443 to 27,581 km/h, a delta-V of only 38.3 m/s.

Was it just an inclination change?

An inclination change would only change direction, not speed. The difference between a 490x490 km orbit and a 490x625 km orbit is indeed about 38 m/s.

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