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Comet-like object seen moving across the evening sky (but cometsdon't move a few degrees in a few minutes!)



 
 
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  #11  
Old February 9th 18, 04:49 AM posted to sci.astro.amateur
Mike_Duffy
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Default Comet-like object seen moving across the evening sky (but comets don't move a few degrees in a few minutes!)

On Thu, 08 Feb 2018 10:04:53 -0500, Davoud wrote:

Someone should update the wiki.


You are probably more knowledgeable than I.


[...] Satellites and UAVs have proved entirely adequate for the
job. There are no "high-altitude hypersonic surveillance aircraft"


Cannot a UAV be a high-altitude surveillance aircraft?

According to https://en.wikipedia.org/wiki/Mach_number

Supersonic = Mach 1.3 to 5.0
Hypersonic = Mach 5 to 10

So, how fast are the UAVs that you know and are allowed to talk about?
  #12  
Old February 9th 18, 07:43 AM posted to sci.astro.amateur
Davoud[_1_]
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Default Comet-like object seen moving across the evening sky (but comets don't move a few degrees in a few minutes!)

Mike_Duffy:
Cannot a UAV be a high-altitude surveillance aircraft?


Could be, but with the U2 and SR 71 the ceiling was 60,000 ft or
higher. UAVs operate at much lower altitudes.

According to https://en.wikipedia.org/wiki/Mach_number

Supersonic = Mach 1.3 to 5.0
Hypersonic = Mach 5 to 10


As far as I know there have been no operational aircraft that were
capable of hypersonic speeds. The SR-71 still holds the speed record,
about 2200 mph, or mach 3.

So, how fast are the UAVs that you know and are allowed to talk about?


I'm going to make you google that one I believe that most UAVs are
designed for slow lingering, not fast flyover.

--
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  #13  
Old February 9th 18, 08:08 AM posted to sci.astro.amateur
Paul Schlyter[_3_]
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Default Comet-like object seen moving across the evening sky (but comets don't move a few degrees in a few minutes!)

On Thu, 08 Feb 2018 10:04:53 -0500, Davoud wrote:
Maybe you should update the wiki entry:


https://en.wikipedia.org/wiki/Lockhe...bird#Successor


Para 1 Sentence4: [...] Thus, there are doubts that the US has

abandoned
the concept of spy planes to complement reconnaissance satellites.


Someone should update the wiki.


That someone can be you.
  #14  
Old February 9th 18, 04:08 PM posted to sci.astro.amateur
Davoud[_1_]
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Default Comet-like object seen moving across the evening sky (but comets don't move a few degrees in a few minutes!)

Davoud:
Someone should update the wiki.


Paul Schlyter:
That someone can be you.


No, not on this subject it can't be me.

--
I agree with almost everything that you have said and almost everything that
you will say in your entire life.

usenet *at* davidillig dawt cawm
  #15  
Old February 9th 18, 04:17 PM posted to sci.astro.amateur
Mike_Duffy
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Default Comet-like object seen moving across the evening sky (but comets don't move a few degrees in a few minutes!)

On Fri, 09 Feb 2018 01:43:53 -0500, Davoud wrote:

I believe that most UAVs are designed for slow lingering, not fast flyover.


That's much less abrasive than: "There are no such aircraft in existence
outside the fevered minds of a few conspiracy theorists".

I cannot imagine an engineer designing a UAV for 'slow lingering', unless
to get as much pictures as possible at the expense of delaying their final
delivery. This may be deemed desireable in some situations, but I can much
more easily imagine that in most situations the military commander ends his
directive to the mission specialist with "As soon as possible" vs. "Take
your time".

Are the pictures returned as exposed film or beamed back via satellite? It
seems that film gives a massive benefit in terms of resolution, but CCD
gives a massive benefit in terms of response time. Without knowing, I guess
that both methods are available to the mission specialist.
  #16  
Old February 9th 18, 05:15 PM posted to sci.astro.amateur
Bill[_9_]
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Default Comet-like object seen moving across the evening sky (but comets don't move a few degrees in a few minutes!)

On Fri, 9 Feb 2018 10:17:24 -0500, Mike_Duffy wrote:

On Fri, 09 Feb 2018 01:43:53 -0500, Davoud wrote:

I believe that most UAVs are designed for slow lingering, not fast flyover.


That's much less abrasive than: "There are no such aircraft in existence
outside the fevered minds of a few conspiracy theorists".

I cannot imagine an engineer designing a UAV for 'slow lingering', unless
to get as much pictures as possible at the expense of delaying their final
delivery. This may be deemed desireable in some situations, but I can much
more easily imagine that in most situations the military commander ends his
directive to the mission specialist with "As soon as possible" vs. "Take
your time".

Are the pictures returned as exposed film or beamed back via satellite? It
seems that film gives a massive benefit in terms of resolution, but CCD
gives a massive benefit in terms of response time. Without knowing, I guess
that both methods are available to the mission specialist.


We can know what's in the public record - but if we attempt to go
beyond, then all we can fo is to imagine, or speculate, about what might
be. That's it.
--
Email address is a Spam trap.
  #17  
Old February 10th 18, 02:03 AM posted to sci.astro.amateur
Davoud[_1_]
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Default Comet-like object seen moving across the evening sky (but comets don't move a few degrees in a few minutes!)

Davoud:
I believe that most UAVs are designed for slow lingering, not fast flyover.


Mike_Duffy:
That's much less abrasive than: "There are no such aircraft in existence
outside the fevered minds of a few conspiracy theorists".


But that's the truth.

I cannot imagine an engineer designing a UAV for 'slow lingering', unless
to get as much pictures as possible at the expense of delaying their final
delivery. This may be deemed desireable in some situations, but I can much
more easily imagine that in most situations the military commander ends his
directive to the mission specialist with "As soon as possible" vs. "Take
your time".


Are the pictures returned as exposed film or beamed back via satellite? It
seems that film gives a massive benefit in terms of resolution, but CCD
gives a massive benefit in terms of response time. Without knowing, I guess
that both methods are available to the mission specialist.


Sheesh! There is a lot of open-source material on how military drones
operate, including on YouTube. Do you seriously think they're carrying
Kodak Instamatics and bringing film back to be developed? Or might they
be sending real-time imagery at the speed of light?

The speed of light is a wondrous thing. These drones have pilots, of
course. The pilot of a drone looking for ISIS in Syria is most likely
in Florida. The imagery is available instantly (allow me a couple of
seconds for satellite delay, as the C is not infinite) to tactical
commanders in the field and intelligence analysts out-of-theater.

--
I agree with almost everything that you have said and almost everything that
you will say in your entire life.

usenet *at* davidillig dawt cawm
  #18  
Old February 11th 18, 08:17 AM posted to sci.astro.amateur
Paul Schlyter[_3_]
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Default Comet-like object seen moving across the evening sky (but comets don't move a few degrees in a few minutes!)

On Fri, 09 Feb 2018 20:03:54 -0500, Davoud wrote:
The imagery is available instantly (allow me a couple of
seconds for satellite delay, as the C is not infinite)


Light speed c will take you to the Moon and back in a couple of
seconds, however the communication satellites are not that far away.
  #19  
Old February 11th 18, 08:19 AM posted to sci.astro.amateur
Paul Schlyter[_3_]
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Default Comet-like object seen moving across the evening sky (but comets don't move a few degrees in a few minutes!)

On Fri, 09 Feb 2018 10:08:42 -0500, Davoud wrote:
Davoud:
Someone should update the wiki.


Paul Schlyter:
That someone can be you.


No, not on this subject it can't be me.


If so, your opinion that the wiki should be updated cannot be
well-founded either..
  #20  
Old February 11th 18, 04:05 PM posted to sci.astro.amateur
Chris L Peterson
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Default Comet-like object seen moving across the evening sky (but comets don't move a few degrees in a few minutes!)

On Sun, 11 Feb 2018 08:19:26 +0100, Paul Schlyter
wrote:

On Fri, 09 Feb 2018 10:08:42 -0500, Davoud wrote:
Davoud:
Someone should update the wiki.


Paul Schlyter:
That someone can be you.


No, not on this subject it can't be me.


If so, your opinion that the wiki should be updated cannot be
well-founded either..


I believe that David has security clearance issues that prevent him
from updating the information. That does not limit him from expressing
the opinion that the wiki needs updating. He's probably more qualified
than anyone in this discussion to make that determination.
 




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