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General Astronomy >> General Observing and Astronomy

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obin robinson
Carpal Tunnel
*****

Reged: 10/25/12

Loc: League City, TX
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: Megabusa]
      #6186398 - 11/10/13 11:37 AM

http://www.spaceflight101.com/goce-re-entry.html

"[15:30 UTC]: GOCE is now at 133 Kilometers dropping about 1.5km per hour and re-entry is less than 10 hours away. The satellite is still operating. Drag levels are preventing any more Gradiometer science so the instrument was switched off. GOCE is in a stable attitude, continuing to make good measurements with its GPS receivers. ESA plans to operate the satellite as long as possible, keeping up regular ground station passes to downlink data."

It looks like it will re-enter before the end of the day.

obin


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choran
Pooh-Bah
*****

Reged: 12/28/12

Re: Heads up! GOCE is decaying and will re-enter soon new [Re: obin robinson]
      #6186764 - 11/10/13 02:46 PM

I've got a crack at it. It's due for a visible pass in my area (southern California) at roughly 7:30 tonight. Problem is, it's a low pass, only about 13 degrees above the horizon in any event, out a couple of hundred miles in the Pacific. The time frame is good, though, according to an update on the crash time. I've maybe a chance in 1000, but that's OK. I do have a sure thing in the morning though--ISS at -3.3 at about 5:15 AM.

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obin robinson
Carpal Tunnel
*****

Reged: 10/25/12

Loc: League City, TX
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: choran]
      #6186903 - 11/10/13 03:47 PM

It's at 133km now. I can't believe it's still in orbit! Get a camera ready just in case it's a bit toasty when it passes you. That might be the last pass!

obin


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rnc39560
Pooh-Bah
*****

Reged: 07/23/13

Loc: MS coast
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: obin robinson]
      #6187167 - 11/10/13 05:25 PM

Hey Obin, I couldn't see anything from my location huh?

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obin robinson
Carpal Tunnel
*****

Reged: 10/25/12

Loc: League City, TX
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: rnc39560]
      #6187258 - 11/10/13 06:13 PM

I think we're out of luck in the central part of the country unless it burns up during daylight. it still has a few orbits left.

obin


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Billytk
Pooh-Bah


Reged: 04/22/12

Loc: Lake Mary, Fl.
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: obin robinson]
      #6187621 - 11/10/13 09:48 PM

So, if you were to see it burn up, would you be able to tell it from a meteor?

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rnc39560
Pooh-Bah
*****

Reged: 07/23/13

Loc: MS coast
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: Billytk]
      #6187782 - 11/10/13 11:27 PM

Its gone. Done. Ka-put

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brianb11213
Postmaster
*****

Reged: 02/25/09

Loc: 55.215N 6.554W
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: Billytk]
      #6187970 - 11/11/13 03:43 AM

Quote:

So, if you were to see it burn up, would you be able to tell it from a meteor?



I think not - the only thing you might notice is that a re-entering satellite (travelling at "only" 7 kilometers per second) might appear to move more slowly across the sky than a bolide/fireball resulting from infalling solar system debris (travelling at 11 kilometers per second, at least, possibly much, much faster depending on the orbital geometry).

Anyhow, GOCE is now GONE.


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rnc39560
Pooh-Bah
*****

Reged: 07/23/13

Loc: MS coast
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: brianb11213]
      #6187988 - 11/11/13 04:09 AM

I'm sure we'll have some more debris to track to its demise!

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David Knisely
Postmaster
*****

Reged: 04/19/04

Loc: southeastern Nebraska
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: rnc39560]
      #6188000 - 11/11/13 04:37 AM

It came down early this evening (0000 UT on Monday, November 11th).

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obin robinson
Carpal Tunnel
*****

Reged: 10/25/12

Loc: League City, TX
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: brianb11213]
      #6188215 - 11/11/13 09:33 AM

Quote:

Quote:

So, if you were to see it burn up, would you be able to tell it from a meteor?



I think not - the only thing you might notice is that a re-entering satellite (travelling at "only" 7 kilometers per second) might appear to move more slowly across the sky than a bolide/fireball resulting from infalling solar system debris (travelling at 11 kilometers per second, at least, possibly much, much faster depending on the orbital geometry).

Anyhow, GOCE is now GONE.




When something as large as GOCE breaks up it tumbles into thousands of pieces. A meteorite is one object that breaks and burns up quickly. A satellite may have tens of thousands of pieces which are being shed off as it tumbles into the upper atomosphere.

Here's a video of a re-entry:

http://www.youtube.com/watch?v=5AG5T9uzgMY

You can see pieces breaking off as the machine is disintegrating in the atmosphere. GOCE was a sleek and fast moving satellite which was stable until only a few moments before re-entry.

Large objects like Skylab and Mir took a while to disintegrate. Not all of the pieces burned up and several hit the earth.

http://www.youtube.com/watch?v=fVQd9Ejkbiw

obin


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YosoY
journeyman


Reged: 11/10/13

Loc: other side of the sky
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: obin robinson]
      #6188216 - 11/11/13 09:33 AM Attachment (13 downloads)

This is my first post. Wanted to share this pic of a smoke trail over S FL last night. Approx. 50 deg from horizon, looking south to east. Taken at 6:16PM Eastern. After checking several websites, think it might be a chunk of GOCE. Trail has an abrupt start and stop point. Definitely not a plane, this is not a flight path. Bright spot is the moon.

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obin robinson
Carpal Tunnel
*****

Reged: 10/25/12

Loc: League City, TX
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: YosoY]
      #6188220 - 11/11/13 09:35 AM

WOW! If that is GOCE then you have a heck of a first post! Welcome aboard!

obin


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YosoY
journeyman


Reged: 11/10/13

Loc: other side of the sky
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: YosoY]
      #6188227 - 11/11/13 09:40 AM Attachment (12 downloads)

second pic of smoke trail, end point is at Cassiopeia.

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YosoY
journeyman


Reged: 11/10/13

Loc: other side of the sky
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: obin robinson]
      #6188249 - 11/11/13 09:53 AM

Thanks Obin. Been lurking in these forums for a while, glad to contribute something

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choran
Pooh-Bah
*****

Reged: 12/28/12

Re: Heads up! GOCE is decaying and will re-enter soon new [Re: YosoY]
      #6188282 - 11/11/13 10:15 AM

Wow, that might be it indeed! The time is about right. I haven't read the reports yet on whether it reentered in your location. Should be some verification indeed. I hope you got it! I was hoping somebody would!

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rnc39560
Pooh-Bah
*****

Reged: 07/23/13

Loc: MS coast
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: choran]
      #6188349 - 11/11/13 10:55 AM

Very cool! Welcome to CN!

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YosoY
journeyman


Reged: 11/10/13

Loc: other side of the sky
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: choran]
      #6188356 - 11/11/13 10:57 AM Attachment (10 downloads)

Maybe not the final entry, but perhaps one of the last orbits since the predictions show it razing the coast of S FL....

Pic from
http://www.slate.com/blogs/bad_astronomy/2013/11/10/goce_european_satellite_a...


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WesC
Carpal Tunnel
*****

Reged: 02/06/13

Loc: La Crescenta, CA
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: YosoY]
      #6188597 - 11/11/13 01:05 PM

I hate to be the party pooper, but I seriously doubt those photos are of GOCE. According to this site GOCE de-orbited very far south, almost at Antarctica, and it was seen breaking up near the Falkland Islands.

http://www.spaceflight101.com/goce-re-entry.html


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brianb11213
Postmaster
*****

Reged: 02/25/09

Loc: 55.215N 6.554W
Re: Heads up! GOCE is decaying and will re-enter soon new [Re: WesC]
      #6188701 - 11/11/13 01:55 PM

Quote:

I hate to be the party pooper, but I seriously doubt those photos are of GOCE.



Yes. The images look a lot like regular aircraft condensation trails to me.


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