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Hi-Speed Meteors ???

 
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shutterwizard



登録日: 2019.02.01
記事: 6
所在地: Cabo Rojo,Puerto Rico

記事日時: Wed Feb 20, 2019 10:24 am    記事の件名: Hi-Speed Meteors ??? 引用付きで返信

Last week I captured one while it was fading in and today I capture one that eventually faded out, so they do have a similar signature, besides just the speed and the shape.

The Watec 902H is PAL at 25 fps.

Here is the link to the video: https://vimeo.com/318342658
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shutterwizard



登録日: 2019.02.01
記事: 6
所在地: Cabo Rojo,Puerto Rico

記事日時: Wed Feb 20, 2019 2:01 pm    記事の件名: 引用付きで返信

https://photos.google.com/photo/AF1QipOo5_b1L2aTlwWQnv_QzKMLgC_e1uuFEykK8Kfh

https://photos.google.com/search/_tra_/photo/AF1QipMsdshmi2ut2Z6Rog-JtHxjnldk_jAPRtAP0wvI
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SonotaCo
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登録日: 2004.08.07
記事: 9742
所在地: 139.67E 35.65N

記事日時: Wed Feb 20, 2019 3:35 pm    記事の件名: 引用付きで返信

Hi
Thank you for showing the video.
It looks very fast, but there are many possibilities.
Some nomal meteors can be recorded like yours, depending on the camera and the lens. Could you let us know the detail of the system?
There are many types of watec 902H, such as 902H3 Ultimate, 902H2 Supreme,...
Which one are you using?
What is the focal length of the lens?
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shutterwizard



登録日: 2019.02.01
記事: 6
所在地: Cabo Rojo,Puerto Rico

記事日時: Wed Feb 20, 2019 4:01 pm    記事の件名: 引用付きで返信

I am using the standard Watec 902H. No ultimate or supreme as they are newer models.

My other Watec is the 902H Ultimate and that one is owned by the Arecibo Observatory and has a fixed 12mm lens. This one was facing further west and could not capture the event in question.

The lens on the Watec 902H is a Computar 2.8 - 12mm Lens at F/1.3
1/3" Sensor with CS Mount

The lens is adjustable and I don't have it all the way out so it could be set at about 5 or 6mm.


最終編集者 shutterwizard [ Thu Feb 21, 2019 6:44 am ], 編集回数 1 回
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SonotaCo
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登録日: 2004.08.07
記事: 9742
所在地: 139.67E 35.65N

記事日時: Wed Feb 20, 2019 5:02 pm    記事の件名: 引用付きで返信

Oh, it was the sky of Puerto Rico! It is exciting!

Any way..
I intended to measure the angular velocity of the object. But it seems it is not easy.

In my observatory, the fastest angular velocity observed in this January is 32.1degree/sec,
and it looks similar speed to yours.
Attached sample is the second one that has 31.1 degree/sec.
It was a real meteor that was observed by 3 station and the geocentric velocity computed was 72.8 km/s.
It was recoded by 1/2"CCD watec 902Hsupreme(NTSC) with 6mm lens.
So I think your case can be a real meteor...
but, as my impression, it looks like some artificial or bioluminescent object that flied near,
because it has almost constant and very bright luminescence.



M20190118_045031_TK8_G8P.jpg
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M20190118_045031_TK8_G8P.jpg



M20190108_045031_TK8_G8.mp4
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 ファイル名:  M20190108_045031_TK8_G8.mp4
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shutterwizard



登録日: 2019.02.01
記事: 6
所在地: Cabo Rojo,Puerto Rico

記事日時: Thu Feb 21, 2019 1:18 am    記事の件名: 引用付きで返信

Like you said,It does have a constant and bright luminescence, unlike a typical meteor.

If I catch anymore of these I will post again.

Thanx for taking the time to look into this.
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shutterwizard



登録日: 2019.02.01
記事: 6
所在地: Cabo Rojo,Puerto Rico

記事日時: Thu Feb 21, 2019 11:10 am    記事の件名: 引用付きで返信

Sonotaco...Here is a comparison of my event and the hi-speed meteor that you posted.

Both events were deinterlaced using the same field option in adobe premiere pro.

Strange how my event maintains the constant and bright luminescence that you mentioned.

This is intriguing and hopefully will turn out to be something we can someday figure out.



comparison_photo.jpg
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My event compared to an actual meteor captured by sonotaco.
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comparison_photo.jpg



comparison_sonotaco3.mp4
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Comparison video of my event and the sonotaco meteor event.

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登録日: 2004.08.07
記事: 9742
所在地: 139.67E 35.65N

記事日時: Fri Feb 22, 2019 8:31 am    記事の件名: 引用付きで返信

well....
To think there may be some unknown matters in the night of Puerto Rico, it sounds somewhat interesting.

If it happens again, I recommend to measure the distance from the camera to the object.
It enables the measurement of the object size, actual flying speed, luminous intensity,...
To measure the distance, triangulation is needed.

As for the accuracy , the cross angle of triangulation should be 10 degree at least.
So if you place the second camera 10m away from the first camera(and if its FOV is over 80degree),
you will be able to measure the object that is at 0.44m to 57m away form the base line.
That will be enough for insects.

10m --> 0.44m to 57m (ex. insects)
100m --> 4.4m to 570m (ex. drones)
10km --> 440m to 57km (ex. air planes)
100km --> 4.4km to 570km (ex. meteors)
1000km --> 44km to 5700km (ex. satellites)

just for memo.
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shutterwizard



登録日: 2019.02.01
記事: 6
所在地: Cabo Rojo,Puerto Rico

記事日時: Fri Feb 22, 2019 12:26 pm    記事の件名: 引用付きで返信

Sounds like an interesting research project. I will separate the cameras like you suggested and hopefully I can capture it on both cams.

I also noticed that both events occured between 23:00 and 23:30 UTC, so that might mean that they were probably illuminated by the descending sun in the horizon, just like other satellites seen from my location at that time.

I will let you know if I get any more hits. Thanx.
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