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What did I just imaged?

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#1 guyroch

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Posted 08 December 2019 - 10:03 PM

This is just off of NGC1761 taken from remote observatory in the Atacama desert in Chile.

 

LEFT   = Taken 2019-12-07 at 10:09pm

MIDDLE = Taken 2019-12-08 at 8:54pm

RIGHT  = Taken 2019-12-08 at 9:20pm

 

15 minute frames in HA.

 

What are the 2 extra stars captured in the middle frame?  

 

Guylain

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Edited by guyroch, 08 December 2019 - 10:33 PM.

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#2 Dan Crowson

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Posted 08 December 2019 - 10:15 PM

I've seen things like this when you catch a plane with flashing lights. The contrails don't show up as well in narrowband so it is hard to tell. Normally I would be pretty sure but I'm maybe 50/50 on this one.

Dan



#3 guyroch

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Posted 08 December 2019 - 10:22 PM

Thanks for the reply.  It's a 15 minutes exposure.  There is no other weird artifact anywhere else on the frame.  Here is the full frame.  I would think that if this were a plane there would be other evidence.  I'm clueless, lol.

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Edited by guyroch, 08 December 2019 - 10:29 PM.


#4 wrnchhead

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Posted 08 December 2019 - 10:25 PM

The planes I’ve caught left a streak, not those pinpoints. Fascinating.

Edited by wrnchhead, 08 December 2019 - 10:26 PM.


#5 tjschultz2011

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Posted 08 December 2019 - 10:28 PM

Agreed, very interesting. I'd like to hear what others think. 



#6 james7ca

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Posted 08 December 2019 - 11:06 PM

I also question whether that could be an airplane, since there appears to be no movement. I have seen what I think were balloons that had lights that blinked only every 20 or 30 seconds. The closest thing to a UFO that I've even seen at night while imaging. These showed up on some widefield camera images and I also looked at them with binoculars. The blinking was very slow and there wasn't a lot of motion over time. The binoculars showed no color or other structure to the object. Just seemingly point-source lights that blinked slowly in the night sky. Odd thing was that when I looked at the images the next day they showed up in two different parts of the sky (so, it appears that there was more than one object).

 

My only other guess would be a cosmic ray strike that was aligned perfectly with the axis of the scope, but those usually appear more pixelated and having two such strikes so close to one another seems highly unlikely.

 

Have you blinked the three images to make certain that these two objects don't appear in a different part of the frame? They may have moved, separated, and changed in brightness.


Edited by james7ca, 08 December 2019 - 11:08 PM.


#7 bmhjr

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Posted 09 December 2019 - 10:05 AM

This is interesting.  Could it be a residual ghost image.  It almost looks to match the pair of stars near the top of the frame.  This is just a guess on my part; I have no experience with CCDs



#8 Alex McConahay

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Posted 09 December 2019 - 10:58 AM

What is the FWHM in pixels? That is, does it cover one pixel, or more? 

 

How about the shape of the distribution? 

 

This might tell us if it is a case of two bad pixels or an actual imaged object. 

 

Alex



#9 guyroch

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Posted 09 December 2019 - 11:51 AM

Have you blinked the three images to make certain that these two objects don't appear in a different part of the frame? They may have moved, separated, and changed in brightness.

I blinked all images and nothing pops out anywhere else.



#10 bortle2

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Posted 09 December 2019 - 11:52 AM

This might tell us if it is a case of two bad pixels or an actual imaged object

Definitely not hot pixels.

 

You may want to enlarge the image in the OP and see by yourself...



#11 guyroch

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Posted 09 December 2019 - 11:53 AM

What is the FWHM in pixels? That is, does it cover one pixel, or more? 

 

How about the shape of the distribution? 

 

This might tell us if it is a case of two bad pixels or an actual imaged object. 

 

Alex

One is about 10 pixels and the other about 13 pixels.  There are perfectly round.  I'm stumped.

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#12 Dan Crowson

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Posted 09 December 2019 - 12:24 PM

Thanks for the reply.  It's a 15 minutes exposure.  There is no other weird artifact anywhere else on the frame.  Here is the full frame.  I would think that if this were a plane there would be other evidence.  I'm clueless, lol.

When I saw your image before and commented, I thought it was the full frame so I figured the 'plane' might have been out of view on the next flash. Seeing that these show up in the center with nothing around them, I'm pretty sure it isn't a plane..
 
Dan



#13 Alex McConahay

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Posted 09 December 2019 - 12:35 PM

It is an unidentified, perhaps flying, object.....

 

Alex


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#14 prefetch

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Posted 09 December 2019 - 02:25 PM

This is interesting.  Could it be a residual ghost image. 

 

no need to jump to a paranormal explanation!

 

 

lol.gif


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#15 WadeH237

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Posted 10 December 2019 - 04:14 PM

I suspect that there was something flying through the frame, and it flashed a strobe twice.  If the strobe pattern was two quick flashes, then a pause, then two quick flashes, and so on, then it might have been in the frame only for the flashes that you caught.  It could have been an aircraft anti-collision light, but typically you'll also see streaks to correspond to navigation lights, which do not flash.  And in some cases where I've caught anti-collision lights, they also lit up the under side of the aircraft, making the nature of the light obvious.

 

For what it's worth, I've seen (visually) lots of flashes in the night sky over the years.  Most of the time - but not always - they are in my peripheral vision.  When I catch them, I always look for the source, and often times, I can't see anything else and no repeats of the flash.  Sometimes I've seen one or two more flashes and then nothing.  I've wondered on occasion if I'm just imagining them, or if there if they are artifacts of my own vision - but on a few occasions, I've had another astronomy next to me ask "did you see that", because they saw the same thing.

 

I'm sure that there is a perfectly reasonable explanation, but I don't know if there is enough data in your images to tell anything for sure.


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#16 paolotto

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Posted 10 December 2019 - 07:55 PM

How close to the well-known Nazca Valley UFO landing strips is that site?  Just saying...



#17 adamphillips

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Posted 10 December 2019 - 08:01 PM

wow those really look like stars. thats a big mystery. seems like it has to be a camera malfunction, but i have no idea how that could happen



#18 Chris Talpas

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Posted 10 December 2019 - 09:38 PM

I wonder if any other imagers on this forum were capturing subs on this target at the same time?

 

If so, it would be interesting for them to look at individual subs during that timeframe to see if they have instances of similar bright stars.

 

Could this be some sort of rare transient event?  An optical equivalent to a brief gamma ray burst?

Just some musings.

 

Chris

 

Unfortunately between work and weather haven't done much imagining this year so no frames from me


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#19 coinboy1

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Posted 11 December 2019 - 08:41 AM

Laser guide stars from a major observatory in the Atacama desert?



#20 Tapio

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Posted 11 December 2019 - 08:44 AM

Laser guide stars from a major observatory in the Atacama desert?

Now this sounds like a plausible explanation...



#21 guyroch

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Posted 11 December 2019 - 11:38 AM

Laser guide stars from a major observatory in the Atacama desert?

That is interesting, there are a lot of world class telescopes nearby.  Mine is at 8000 feet just south of San Pedro de Atacama.  The cluster of telescopes you see in the far right are about 15,000+ feet.

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#22 freestar8n

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Posted 11 December 2019 - 03:41 PM

The left image is from the previous night.  Is the image with the dots the first image of the session?  That would make it sound more like rbi or something.

 

What camera is this?  How are you focusing?  Do you have the frame (of anything) taken right before the middle image?

 

Frank



#23 guyroch

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Posted 11 December 2019 - 03:45 PM

The left image is from the previous night.  Is the image with the dots the first image of the session?  That would make it sound more like rbi or something.

 

What camera is this?  How are you focusing?  Do you have the frame (of anything) taken right before the middle image?

 

Frank

Hi Frank,

 

This was indeed the first LIGHT image of the night on the December 8th; but not the first image the camera took that night. Autofocus and platesolving took about 10 to 12 frames between both of them BEFORE the first light frame was taken.

 

This was taken with a Moravian G4-16803 Mk II camera and a TEC140.

 

Guylain


Edited by guyroch, 12 December 2019 - 01:30 AM.


#24 freestar8n

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Posted 11 December 2019 - 04:20 PM

Hi guy. Did autofocus use the same field or did you move to bright star?

You might look at first lights from other nights.

Frank

#25 guyroch

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Posted 11 December 2019 - 04:23 PM

Hi guy. Did autofocus use the same field or did you move to bright star?

You might look at first lights from other nights.

Frank

Same field for auto focus, no slews.

 

First image from previous night looks normal (without the 2 additional stars).

 

Guyain




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