(meteorobs) Large fireball over Arizona Dec 11 2013 - video from near Santa Fe
Jodie Reynolds
spacerocks at spaceballoon.org
Wed Dec 11 18:35:52 EST 2013
Hello Steve,
The double-composite?
I cheated. I overlaid the two still frames as layers in photoshop,
then screened the top layer. Added the identifying text as a text
layer to the top-most layer.
Ultimately I'll write an ImageMagick or GD-based application to
composite these things together, I just haven't gotten around to it
yet - so many projects, so many [more] demands. ;-)
--- Jodie
Wednesday, December 11, 2013, 3:21:54 PM, you wrote:
> Hi Jodie,
> I run Node 18 in Lake Station, In. I was wondering how you generated the attached image?
> Best,
> Steve
>
> Steve Witt
> IMCA #9020
> http://imca.cc/
> ----- Original Message -----
>> From: Jodie Reynolds <spacerocks at spaceballoon.org>
>> To: Jim Wooddell <nf114ec at npgcable.com>
>> Cc: Meteor science and meteor observing <meteorobs at meteorobs.org>
>> Sent: Wednesday, December 11, 2013 2:30 PM
>> Subject: Re: (meteorobs) Large fireball over Arizona Dec 11 2013 - video from near Santa Fe
>>
>> Hello Jim,
>>
>> Let me first take the opportunity to ask other camera owners a favor:
>>
>> Please go toss a black plastic trash bag or a blanket or something
>> over your camera some evening and record thirty seconds or so of
>> nothing but that black cover. This creates dark frames, and allows
>> us to stack your video to acquire more reference objects while
>> simultaneously allowing us to subtract the hot and dead pixels (some
>> of these cameras have a lot). My cameras, with the exception of the
>> Sandia Sentinel camera, are pixel mapped in the camera - subtraction
>> happens before it even reaches a recorder.
>>
>> Bonus points for recording a minute of video a few times over a few
>> separate nights with no events and no moon, then storing them with
>> precise time and date. These allow us to stack the frames and build
>> a known calibration profile.
>>
>> In Thomas' example:
>> East/West are mirrored, and the distortion of the
>> lens isn't too bad, although down in that corner like that you're
>> never going to get _that_ close for such a short event. The moon is
>> a little lower than I'd expect suggesting some stretching out at the
>> edges that would need to be corrected. Without another camera that
>> can see the event through the region of critical focus, I doubt
>> anyone would make it very far though.
>>
>>
>>
>> Here's his sky with grid marking, close enough for the data that's
>> there:
>>
>> http://www.spaceballoon.org/20131211_021057AZ8361_Ashcraft-Sky.png
>>
>>
>> --- Jodie
>>
>> Wednesday, December 11, 2013, 11:57:23 AM, you wrote:
>>
>>> Hello Thomas,
>>
>>> Can you please provide a calibrated Azimuth and Elevation for the
>>> Beginning and End of this event, please?
>>
>>> Thanks!
>>
>>> Jim Wooddell
>>
>>
>>> On 12/11/2013 8:43 AM, Thomas Ashcraft wrote:
>>>> Dec 11 2013
>>>>
>>>> My all-sky camera caught the large fireball over southern Arizona at
>>>> 02:10:57 UT. The fireball was over 350 miles from my observatory.
>>>>
>>>> Not sure if there might be any useful data since it is miniscule at
>>>> the edge of my field of view.
>>>>
>>>> In the video the meteor appears at lower screen right passing near the
>>>> bright dot which is Venus. NOTE: The Moon is at low screen center,
>>>> *not* to be confused with the fireball please.
>>>>
>>>> http://www.heliotown.com/FBns20131211_021057ARIZ8361_Ashcraft.mp4
>>>>
>>>> Thomas Ashcraft - Heliotown - New Mexico
>>
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>>
>>
>>
>> --
>> Best regards,
>> Jodie mailto:spacerocks at spaceballoon.org
>>
>>
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--
Best regards,
Jodie mailto:spacerocks at spaceballoon.org
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