Re: UNKNOWN object streak across the solar disk in a GOES-16 image

From: George Roberts via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 21 Apr 2022 23:19:23 -0400
This streak doesn't make sense as an asteroid, satellite or other 
roundish object passing in front of the sun.

Bright objects can make lines like this as the camera lens is 
effectively open for a long time (for example 2 seconds) and the object 
can easily be 1000X brighter than the dark background of "space".

But dark objects can not.  The line would be too faint to see.  
Certainly fainter than shown in the photo.

For example if the object is round you can see the line is easily 100 
times - probaby 500 times longer than the line is thick.  Even if only 
100, then for every pixel that is dark across the sun, the pixel could 
only be dimmed by 1%.  Because only 1% of the time that the shutter was 
open was the sun dimmed in that area.  This looks closer to 100% dimming 
(at least 50% dimming).  So this is not some small round object.

It could be a long skinny wire of some sort?  Or a crack int he lens?  
Or some artefact of the camera. Or a badly stiched panoramic. Or may 
other things.  But it's not an eclipsing object unless that object is 
long and skinny like a wire.

Also isn't GOES16 always pointed at the earth?  Never the sun?  Also 
this photo is in some strange wavelength.  Maybe xray or ultra violet.  
Oh - I see goes-16 does have UV and Xray sensors.  Okay.  So maybe it 
could be GOES 16.

- George


On 4/21/22 18:07, Gonzalo Blasco via Seesat-l wrote:
> Hi all,
>
> Sam Deen, in the MPML (Minor Planet Mailing List) have just reported a
> transit that seems a satellite for me, although he thinks It could be a NEO
>
> I copy paste his email asking for your opinion
>
> At 21 abr 2022 a la(s) 16:54, Sam Deen wrote:
>
>
> *I noticed that in a recent solar image taken by GOES-16 there is a very
> visible streak across the solar disk and surrounding Corona:*
>
> *https://media.discordapp.net/attachments/570687129118703637/966811333314093177/unknown.png*
> <https://media.discordapp.net/attachments/570687129118703637/966811333314093177/unknown.png?width=1343&height=1131>
>
> *This is very strange for quite a few reasons:*
> *1: GOES-16 is in geosynchronous orbit*
> *2: this image was taken while GOES-16 was over Earth's day-side, meaning
> that it was looking FURTHER than geosynchronous orbit*
> *3: the streak clearly appears quite strong, suggesting a rather large and
> slow-moving object transited across the sun.*
>
> *This seems to have all the features of a near-earth asteroid photobombing
> the Sun on a near-Earth approach. Even the apparent brightness fluctuation
> doesn't seem to indicate a satellite: you can see the apparent 'largest'
> parts of the streak are where the Sun is dimmest, while the 'thinnest' are
> where the Sun is brightest. The actual trail is quite constant, but the
> brightness it silhouettes varies.*
>
> *Can anyone with more familiarity with the GOES-16 satellite identify what
> exactly this object is? Unfortunately the released image is highly
> contrast-enhanced so it's hard to tell anything concrete about the streak.*
>
> *~Sam*
>
> Do you think a Sat is possible at this orbit with this kind of path, or is
> it more like a natural object?
>
> Sincerely,
> --
> Gonzalo Blasco Gil
> _______________________________________________
> Seesat-l mailing list
> http://mailman.satobs.org/mailman/listinfo/seesat-l


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Received on Thu Apr 21 2022 - 22:20:34 UTC

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