Recorded 21st Oct 2018 at 8:39pm to 8:42pm AEDT
From Narre Warren Australia.
The camera, a Sony alpha 5100 was set to record all night at 20 sec exposures every 20 or so seconds.
I was trying to record Orionid Meteors or the Meteors from the Hailey's Comet tail in the NE sky.
I knew the Moon would be a problem, but I needed the time exposure to see the Meteors.
I don't normally set the camera up to do 20 sec exposures while the Moon is around, But I do use those settings quite often when it isn't around.
Normally the settings would be 5 sec at 800 iso. Not 20 sec at 400 iso like in the video.
But just after I set up the camera within a couple of minutes, this strange dark object went across the sky.
Each photo is 20 seconds worth of continuous recording.
I have many bats crossing my sky at night and I rarely ever see them because they are too fast and the camera
can't capture their speed at the slower exposure.
But I thought I'd do some experiments anyway.
While conversing with MrGreyface we decided I would stick black socks onto a long 4 mtr pole (fishing rod) and try
to work out distance and speed.
I could only hold the socks up about 1 mtr above the camera because the all sky dome is already 4 mtrs above ground level.
I held the rod up there until my arm could no longer hold it and the results were dismal.
Not sure if because the Moon drowned out the sky, but the camera couldn't see the socks very well.
Which means that whatever the dark shadow thing is, it was around long enough, or was big enough to register on the camera.
Although, last night the 24th Oct, the Moon was full, on the 21st Oct it was 3/4 full.
That may make a difference.
I set up other cameras as well last night to do my normal timelapses and included one of them in my experiments.
Results are in the video.
I have a siesmic device that measures earth tremmors and pressure changes in the atmosphere.
It is situated under my observatory. I was inside my observatory setting up my telescope straight after I set up the allsky
camera to record the Moon. In the video I show results but they are marred by my movement in the observatory.
Check the video :o)
MrGreyface also mentioned birds and murmeration
The birds seem to change shape as they fly around. This shadow thing kept its shape throughout.
So if anyone knows what I'm looking at, let me know please :) We are approaching Summer now (middle of Spring).
The weather is warmer. I doubt birds or animals are migrating anywhere. They'd be nesting.
Heres the video: