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Question: Odd Dashes acrossed image

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#1 44maurer

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Posted 16 June 2019 - 12:48 AM

Any idea what this may have been, a bird?

 

I was setting up and testing my RASA ~10pm. I was shooting 1 second exposures, so this is a stack of 9 frames. I was watching as this happened and looked up when this was occurring and couldn't see anything. If scale helps, Scope is 620mm, camera was a ZWO ASI1600 (non Pro).

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  • Dash_1.jpg


#2 scadvice

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Posted 16 June 2019 - 12:55 AM

Satellite or plane.  I'd say...because of the sort of left to right pattern I'm going with the plane.



#3 44maurer

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Posted 16 June 2019 - 01:07 AM

Satellite or plane.  I'd say...because of the sort of left to right pattern I'm going with the plane.

I had satellites in other frames,  doesn't look anything like a satellite. Plane? not that I could see, I looked up at the time this was happening and I've never seen a plane look like this(same for satellite).



#4 Alex McConahay

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Posted 16 June 2019 - 01:18 AM

Do I take it that each sub has one portion of that track. That is each sub has one dash, displaced from one frame to the next? Or do all nine frames have the same pattern?

 

And are the stars then registered?

 

What intrigues me is how it seems to be on one side, and then the other. Also, it is diffuse, and not specular (well, whatever a stretched specular would be.) 

Alex



#5 44maurer

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Posted 16 June 2019 - 01:27 AM

Do I take it that each sub has one portion of that track. That is each sub has one dash, displaced from one frame to the next? Or do all nine frames have the same pattern?

 

And are the stars then registered?

 

What intrigues me is how it seems to be on one side, and then the other. Also, it is diffuse, and not specular (well, whatever a stretched specular would be.) 

Alex

Yes, each dash was a frame. I just did a quick stack in Nebulosity to get the series into 1 image.



#6 Chris MN

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Posted 16 June 2019 - 04:07 AM

How about an asteroid?  I've had that happen.

 

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#7 wrnchhead

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Posted 16 June 2019 - 04:25 AM

Hard to believe it's an asteroid, with that back and forth bit. And the fact that it appears to be out of focus. A curiosity for sure. 



#8 Tapio

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Posted 16 June 2019 - 04:38 AM

Tumbling satellite.

#9 44maurer

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Posted 16 June 2019 - 04:42 AM

Yes very odd. If you think of 1 segment being a 1 second frame...it’s moving a lot, not in a straight line...that’s why I was thinking maybe a bird?


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#10 Der_Pit

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Posted 16 June 2019 - 05:16 AM

Well, either rotation of a satellite, maybe with solar panels that give you left-right intenisty maxima.  Or a plane with blinking position lights in two/three places.

But as you can see some curvature in the trails I'd vote for the rotating satellite.



#11 RedLionNJ

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Posted 16 June 2019 - 10:24 AM

Since it's not in focus (like the galaxies and stars), it's inside the Earth's atmosphere. I would say extremely close - within a few thousand feet of the scope. The fact it took around 20 seconds to cross the field is quite interesting. I've seen moonlight-illuminated birds (particularly migratory geese) appear like this, but they usually travel in larger flocks.

 

My gut is still tending toward a bird, illuminated by reflected moonlight.


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#12 Alex McConahay

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Posted 16 June 2019 - 10:43 AM

What bothers me is that it has a consistent left-right pattern. A balloon drifting past would not have that. Nor would a bird flapping its wings unless by extraordinary coincidence.

 

Alex



#13 scadvice

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Posted 16 June 2019 - 11:02 AM

Plane retracted...

 

I'm at guessing now a light weight plastic bag being blown along through your field, tumbling and picking up reflected light.



#14 44maurer

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Posted 16 June 2019 - 01:55 PM

yes, a ballon or a plastic bag would seem reasonable.



#15 PhilHoyle

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Posted 16 June 2019 - 03:22 PM

Tumbling satellite.

Second.



#16 Alex McConahay

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Posted 16 June 2019 - 04:18 PM

Awfully big for a tumbling satellite. Satellites do not cover that many pixels. And a satellite should be in focus at its distance. 

 

Alex



#17 Alex McConahay

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Posted 16 June 2019 - 04:23 PM

There is no dithering involved, is there?

 

Alex



#18 wrnchhead

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Posted 16 June 2019 - 04:44 PM

I don’t think the dither could complete in the timeframe given between subframes. I agree that anything outside of the atmosphere would likely be in focus but it’s not too close either. What the heck is it it’s moving side to side with different patterns. Fairly fast. Could it be two objects?

#19 wrnchhead

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Posted 16 June 2019 - 05:00 PM

Can you post the raw frames somewhere? 



#20 Alex McConahay

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Posted 16 June 2019 - 05:36 PM

>>>>>>>  moving side to side with different patterns.

>>>>>>> Could it be two objects

 

I could buy that......except it is synchronized with the shots. At no point do we find a "transition" shot, where one side is lit up for part of the exposure, and the other for the other part. At no time do we see two or more shots on the same side in a row. It seems a perfect lockstep....Left, right, left, right. Each lasting just as long as the exposure (or at least in synch).  Instead, they are pretty much one side in one shot, and (somehow timed perfectly with the exposure/download cycle of the camera) and the other side in the next.

 

Alex



#21 freestar8n

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Posted 16 June 2019 - 05:49 PM

Is there really one dash in each exposure? It is very weird. Looks nearby and like a moth or bat. But no matter what it is hard to explain.

Frank

#22 jhayes_tucson

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Posted 16 June 2019 - 06:24 PM

That looks like a strobe from an airplane to me.

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#23 44maurer

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Posted 16 June 2019 - 07:11 PM

There is no dithering involved, is there?

 

Alex

 No dithering, as I was just trying to test out the camera setup. (I have another issue that I was checking).



#24 44maurer

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Posted 16 June 2019 - 07:11 PM

That looks like a strobe from an airplane to me.

John

I saw it as it was happening, I couldn’t see anything visually.



#25 44maurer

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Posted 16 June 2019 - 07:12 PM

Is there really one dash in each exposure? It is very weird. Looks nearby and like a moth or bat. But no matter what it is hard to explain.

Frank

Yes, consecutive 1 dash per frame.




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