(meteorobs) Obs: 20 October 2007

[meteoreye at comcast.net]

Dave,

Any idea of how to convert your "Zenithal Sky Brightness: 21.37 mag./sq. " into LM so it can be used for ZHR calculations?

Particularly, since the idea of LM for ZHR normalizations requires a measurement of the field of view, which ideally should not be at the zenith.

I always measure 3 areas. One at the zenith (99 % of the time, the best reading), the one closest to the center of my FOV, and one lower in altitude than the FOV. That way, I get a realistic average.

For some times I will add another area or two close to the FOV, if it can be counted quickly...

Wayne
-------------- Original message -------------- 
From: "David Oesper" <oesper at aol.com> 

> 20 October 2007 0530 - 0731 UT (20 Oct 12:30 – 2:31 a.m. CDT) 
> 
> David Oesper 
> NW of Dodgeville, Wisconsin 
> 43 00 39.5 N, 90 16 05.4 W, ~1110 ft. 
> Method: Visual, digital voice recorder, talking clock 
> 
> Zenithal Sky Brightness: 21.37 mag./sq. " @ 0526 UT 
> Sky Conditions: Clear 
> 
> 0530 – 0630 
> Orionids: 3 
> Other: 2 
> Total Meteors: 5 
> 
> 0630 – 0730 
> Orionids: 14 
> Other: 5 
> Total Meteors: 19 
> 
> 0533 +1 ORI 
> 0540 +3 Aur? 
> 0544 ? ORI 
> 0548 +2 ORI 
> 0552 +3 Aur? 
> 
> 0634 +1 ORI 
> 0639 +2 Spo 
> ? +4 Spo 
> 0650 +1 ORI 
> 0656 +4 ORI 
> 0701 +4 ORI 
> 0704 ? ORI 
> 0704 +3 ORI 
> 0705 +1 ORI 
> 0706 +1 ORI 
> 0708 +3 Aur? 
> ? +4 ORI 
> 0712 +0 Spo, slow, Eri towards S horizon 
> 0715 +2 Aur?, medium speed 
> 0716 +3 ORI 
> 0717 +2 ORI 
> 0719 +4 ORI 
> 0720 +1 ORI, 2 sec. train 
> 0728 +4 ORI 
> 
> 0731 +3 ORI 
> 
> Zenithal Sky Brightness: 21.42 mag./sq. " @ 0736 UT 
> 
> Comments: First time using digital voice recorder, sometimes 
> information was clipped between "START" and "STOP". I need to adjust 
> the AVR (Automatic Voice Recording) level so the recorder does not 
> stop during natural pauses in my speech. The best solution may be to 
> repeat all information twice, including "START, START" and "STOP, 
> STOP" to wrap each event. 
> 
> During the 121 minutes I observed, four medium speed meteors 
> (generally magnitude +3) appeared to emanate from within a radiant 
> inside the pentagon of Auriga. 
> 
> 
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