[meteorite-list] FW: 10/04/14 AZ Fireball: Sextant-Compass readings of Belmont, AZ smoke tr ail

Fri, 10 Oct 2014 19:31:32 -0700 




From: [email protected]
To: [email protected]; [email protected]
Subject: RE: [meteorite-list] 10/04/14 AZ Fireball: Sextant-Compass readings of 
Belmont, AZ smoke tr ail
Date: Fri, 10 Oct 2014 20:59:04 -0500


 Hello Steve and all, Thanks for your hard work. When it comes down to a good 
starting point,
say using Kayenta or Hwy 160 as a reference, where would you suggest? I'm going 
to try to get
over to that area Sunday. If there is anyone that has begin a seach for this 
possible fall, give me
a shout. Would like to see a new fall in this area, even though it may be on a 
Reservation. May
have to brush up on my trading skills. 😉
Dennis Miller
Northwest New Mexico
[email protected]
 



> Date: Sat, 11 Oct 2014 00:55:13 +0000
> To: [email protected]
> Subject: [meteorite-list] 10/04/14 AZ Fireball: Sextant-Compass readings of 
> Belmont, AZ smoke tr ail
> From: [email protected]
> 
> Hello all,
> 
> I took a trip out to the Belmont, AZ Weather Service and stood in front of 
> the camera that took the photo of the smoke cloud 5 or 6 minutes after it had 
> ended. I had the photo in hand to estimate to the best of my ability as to 
> where the clouds were in the sky as related to Fremont Peak that morning. 
> These clouds might have dissipated somewhat and drifted slightly to the south 
> east 5 to 6 min after the fireball passed.
> 
> I spent over an hour taking readings with my WWII Bendix A-7 sextant, and two 
> WWI British prismatic compasses, averaging the readings of each. 
> 
> (BTW: these compasses are top notch, so good that they were used by sailors 
> lost at sea to find destinations even without a sextant. The WWII Bendix A-7 
> is a fantastic sextant and very accurate as well)
> 
> Readings from the compasses: (Magnetic) 35 - 36 degrees Easterly direction.
> 
> Sextant, after estimating where the clouds were over Fremont Peak.
> 
> Top cloud (larger one): 13.0 degrees above horizon.
> 
> Bottom cloud (smaller one): 7.25 degrees above horizon.
> 
> Average between both as the two clouds are linked in a chain ~8.6 degrees 
> above horizon.
> 
> The top cloud which is very dispersed after the six or so min after the 
> fireball end at 15:52:32 represents the start of the fireball, and from 
> reports it came in a a very steep angle ~45 degrees from the North East. This 
> fireball was observed from the Belmont location and others West of Flagstaff 
> including my all sky camera, as going DOWNWARD. If it rose up, or remained 
> stationary instead of downward as it did, then it would appear heading toward 
> and above the Belmont Weather station camera. In all sightings west of 
> Flagstaff it went DOWNWARD and to the East.
> 
> So the higher cloud appears higher in the sky due to the fact that the 
> luminous flight began at about 60 miles or so. The smaller more defined cloud 
> is the lower one to the ground maybe 15 to 20 miles above ground and closer 
> to the Belmont Weather camera than the more distant larger dispersed portion 
> of the smoke cloud. 
> 
> Do the trig. 13, 7.25 degrees above the horizon and an average between the 
> two above the horizon taking into account the downward angle of the Fireball 
> and the average assumed height between the beginning and the end of the event 
> between 60 and 15 miles above the ground.
> 
> The larger cloud is most likely over 120 miles away from the camera. The 
> lower one most likely over 70 miles away from the camera.
> 
> And the compass heading of 35-36 degrees is a magnetic heading, keeping in 
> mind the magnetic variation of 10.5 degrees to East of the the Celestial Pole 
> which is True North to which my all sky camera is aligned. 
> 
> Draw your lines accordingly from the Belmont Weather Station at Navajo Army 
> Depot along that line of magnetic bearing 35-36 degrees average between the 
> two 35.5 degrees. If you transpose to a map that is aligned to the true 
> Celestial North, be sure to take into account the magnetic variation of 10.5 
> degrees in drawing the line.
> 
> 
> Steve Schoner.
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