(meteorobs) Correction to previous Trig.calculation.

[stange34 at sbcglobal.net]

Hi Chris.

The altitude was set at 60 miles because the actual altitude is unknown at 
this time and is not likely higher. The generally accepted thought is 
ablation begins at 60miles or less. This was clearly stated as a condition 
for the estimated path shown.

Notwithstanding that, if the actual elevation is less it will only shift the 
line closer to Albuquerque. The path line should stay essentially entact in 
direction.

I tried to indicate this graph is predicated on only one photograph(the 
ablation) and the object was to show the possibility earth grazing may have 
occured because of the meteors luminescence beyond the point of major 
ablation.

Larry
YCSentinel

----- Original Message ----- 
From: "Chris Peterson" <clp at alumni.caltech.edu>
To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
Sent: 2007/09/18 21:11
Subject: Re: (meteorobs) Correction to previous Trig.calculation.


>I don't see how you can make any assumptions about height or descent angle 
>from a single station image. What is the basis for considering the height 
>to be 60 miles, or for thinking it might have been an Earth grazer?
>
> If the meteor had been as high as 60 miles when it crossed into Colorado, 
> I would have recorded it on three cameras. The fact that it wasn't 
> detected makes me believe it fizzled out between 20 and 30 miles high.
>
> Chris
>
> *****************************************
> Chris L Peterson
> Cloudbait Observatory
> http://www.cloudbait.com
>
>
> ----- Original Message ----- 
> From: <stange34 at sbcglobal.net>
> To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
> Sent: Tuesday, September 18, 2007 9:40 PM
> Subject: Re: (meteorobs) Correction to previous Trig.calculation.
>
>
>> Yes, thankyou Thomas.
>>
>> The degree compression at low horizons of mirrors is only estimated for 
>> now.
>> Actual triangulation may show a need to build a semi-log scale. 
>> Meanwhile, a method of calibration is being pursued by me using 
>> planet/star positions in mirror vision style for those kinds of systems.
>>
>> Larry
>
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