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sl8

(14,053 posts)
Wed Jan 5, 2022, 09:47 AM Jan 2022

Upper stage from failed Russian rocket to make uncontrolled re-entry

https://arstechnica.com/science/2022/01/whats-going-on-with-russias-new-heavy-lift-rocket/

Upper stage from failed Russian rocket to make uncontrolled re-entry

The troubles with the long-in-development Angara A5 continue.

by Eric Berger - Jan 4, 2022 11:02am EST

The Russian space program has spent more than two decades developing the Angara family of rockets, and government officials have expressed high hopes for the Angara A5 heavy lift variant. It is hoped that the Angara A5 rocket can replace the venerable Proton booster, which is more than half a century old and in recent years has had reliability issues.

[...[

Two days after the launch, even, the state-controlled Russian news service RT published an article with a headline stating that the Persei upper stage would significantly improve the performance of the Angara A5 vehicle. However, the article mentioned that Russian space chief Dmitry Rogozin was still waiting for the upper stage to relight.

"Dmitriy Rogozin congratulated the military on the successful launch of the new booster, noting that we are still waiting for the Persei upper stage to work," the article states. They're still waiting. The Persei upper stage, of course, was never going to relight, and Russian officials had to know this.

The proof is in the sky. This Persei stage, tracked as IPM 3/Persey, is now well below 200 km and will likely make an uncontrolled re-entry into Earth's atmosphere on Wednesday. Hopefully, it will do so over an ocean.

14 replies = new reply since forum marked as read
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Upper stage from failed Russian rocket to make uncontrolled re-entry (Original Post) sl8 Jan 2022 OP
Duck, You Sucker. NT mahatmakanejeeves Jan 2022 #1
The Weatherboys Weather page has been posting NewDayOranges Jan 2022 #2
I hope it lands smack on Putin nt Wicked Blue Jan 2022 #3
No, he will ride his horse bare-chested to the site and catch it in his brawny arms. marie999 Jan 2022 #4
Cool satellite tracking link in the article: crickets Jan 2022 #5
THAT IS SO COOL! dropping 24 miles in altitude every hour. lindysalsagal Jan 2022 #6
83 miles up and increasing slightly. Anyone know why? Aviation experts on DU??? lindysalsagal Jan 2022 #7
I think it's being buffeted by atmospheric winds, tumbling up and down. crickets Jan 2022 #10
Elliptical orbit? sl8 Jan 2022 #11
Don't Look Up Talitha Jan 2022 #8
Right! I was just gonna post: "Australia! Don't Look UP!" But it won't land there. lindysalsagal Jan 2022 #9
So I never took physics, but I googled speed of descent of a falling object lindysalsagal Jan 2022 #12
Crashed into Pacific this afternoon ThoughtCriminal Jan 2022 #13
I missed it! lindysalsagal Jan 2022 #14

NewDayOranges

(694 posts)
2. The Weatherboys Weather page has been posting
Wed Jan 5, 2022, 11:03 AM
Jan 2022

About this for several days now...

Since news of this errant rocket wasn't posted elsewhere, I thought this might be a hoax...

crickets

(25,994 posts)
5. Cool satellite tracking link in the article:
Wed Jan 5, 2022, 12:47 PM
Jan 2022
https://www.n2yo.com/?s=50505

Currently over South America. Here's hoping it comes down in the ocean and not on land.

lindysalsagal

(20,802 posts)
6. THAT IS SO COOL! dropping 24 miles in altitude every hour.
Wed Jan 5, 2022, 12:54 PM
Jan 2022

Last edited Wed Jan 5, 2022, 01:58 PM - Edit history (1)

At this rate, assuming it doesn't increase much, it should be landed in the next 4 hours.....Ok: It just returned to about the starting place in south america an hour ago. So, we'll have to see 3+ earth rotations before it lands, assuming all the speeds remain constant...I have no idea if they will.

crickets

(25,994 posts)
10. I think it's being buffeted by atmospheric winds, tumbling up and down.
Wed Jan 5, 2022, 02:14 PM
Jan 2022

That's my uneducated guess. It was at about 83 miles up just before noon. Currently it's 80-81 miles up. It is falling, but slowly.

sl8

(14,053 posts)
11. Elliptical orbit?
Wed Jan 5, 2022, 03:30 PM
Jan 2022

Last edited Wed Jan 5, 2022, 05:33 PM - Edit history (1)

The distance to Earth for an object in an ellipitical orbit would increase and decrease.

Not sure if that's what we're seeing here.

lindysalsagal

(20,802 posts)
12. So I never took physics, but I googled speed of descent of a falling object
Wed Jan 5, 2022, 04:15 PM
Jan 2022

Last edited Wed Jan 5, 2022, 06:18 PM - Edit history (2)

And the height of the atmosphere. When it drops another 6 miles, most of it will blow up on impact with the atmosphere. The smaller bits that survive will hit the earth in under 2 minutes!

I have no idea how to calculate how long it will continue to be in orbit, caught between our gravity and the sun, moon or whatever other gravity forces catch it. So, I guess we just keep watching until it seems to speed up???

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