[meteorite-list] October 4th fireball northeast of Flagstaff
Hi All, Sorry for the premature end -- fat-fingered the send key apparently. Continuing: Steve was also good enough to travel out to the Bellemont NWS site that took an image of the smoke trails several minutes after the fireball. He wrote: "Yesterday at Bellemont Weather Station right under and in line with the camera that took shots of the smoke clouds, I determined that they were at between 35 and 36 degrees magnetic readings. These reading are as close as I can determine as to the position of the clouds that day; 5 to 6 min later. ..." "Bellemont Weather Station: Average 35.5 degrees NE add 10.5 degrees for Celestial Pole, making it 45.5 degrees NE from Celestial North." Using Google Earth and aligning the view with Fremont Peak, I measured an azimuth of 55.6 degrees to the lower smoke trail (which is the more important one). The higher cloud has an azimuth less than 1 degree to the left (i.e. lower azimuth) than the lower cloud. This is a large discrepancy between the two of us -- some 10 degrees. I'm confident that the accuracy on my measurement is better than 1 degree. Looking at Google Earth, I suspect he was aligning off the wrong peak. 45-degree azimuth points to Mt. Humphreys, not Fremont Peak. Another good smoke trail image was taken from downtown Flagstaff, about a half-mile southeast of Steve. It is a little more difficult to measure the angles in this image, but 1-degree accuracy is certainly achievable. I measured an angle of 47-degrees to the lower cloud, very consistent with the 46.5-degree terminal azimuth I got for Steve's camera. That the angle is slightly higher can easily be explained by a few minutes of eastward drift by the cloud. The 10-mile separation between the Bellemont and downtown Flagstaff cameras is enough to get a decent range estimate to the cloud. This range is further confirmed by a third dust trail image taken from much further to the east. Cheers, Rob __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] 10.04.14 AZ Daytime Fireball: Direct compass measurements
Hello all, OOPS! Bad me! An "up down, right left brain defect" echoes from Jan. 2003. I made a major error in regards to the smoke clouds. The larger one was at ~13 degrees above the horizon and FURTHEST from the observer. The lower one is the termination point at ~7.25 degrees which is closest to the observer. So my original statement: "Estimated from the larger and higher elevation smoke cloud (terminal burst). The lower one measured at 7.25 degrees above horizon was the furthest away the fireball entry point. and at a much higher altitude in the smoke train." Should read: "Estimated from the larger and higher smoke cloud at ~13 degrees above horizon was the furthest away: the fireball entry point and at a much higher altitude in the smoke train. The lower one measured at ~7.25 degrees above horizon was closest to the observer(terminal burst)." And so I changed it in the original message. Pesky brain "up down, right-left" defects got to watch out for them... Steve -- Original Message -- From: "Steve Schoner" To: meteorite-list@meteoritecentral.com Subject: 10.04.14 AZ Daytime Fireball: Direct compass measurements Date: Sat, 11 Oct 2014 20:20:57 GMT Hello, all, Being that my all sky camera was damaged by lightning in July and replaced in August, and being that it did capture the image of this event near a prominent tree, I went up on the roof for direct measurements with two of my British WWII prismatic compasses. Keep in mind my node6 camera is aligned to the North Celestial Pole (North Star). The north star is a Cepheid variable, and unless it brightens to mag 2 it is very difficult to see with the All Sky camera. It's position is 10.5 degrees to the wast of the magnetic pole. Yesterday at Bellemont Weather Station right under and in line with the camera that took shots of the smoke clouds,I determined that they were at between 35 and 36 degrees magnetic readings. These reading are as close as I can determine as to the position of the clouds that day; 5 to 6 min later. But these smoke clouds might have drifted to the east in those five min and the degree readings would then be off maybe a degree or more depending on the wind speed 15 to 60 miles up. Bellemont Weather Station: Average 35.5 degrees NE add 10.5 degrees for Celestial Pole, making it 45.5 degrees NE from Celestial North. With respect to my "node6" rooftop camera, I studied the image captured and though the fireball image is small it traveled down to the right side of a pine tree on the shaded side. So with my compass in hand and taking measurements of where I think it vanished above or behind the tree I came out with 32-33 degrees NE. Flagstaff node6 All Sky Camera: Average 32.5 degrees NE add 10.5 degrees for Celestial Pole, making it 43 degrees NE. Estimated elevation above the horizon of burnout (terminal burst) from both locations determined with Bendix A-7 Bubble Sextant: ~7.25 - 13 degrees at Bellemont. Estimated from the larger and higher smoke cloud at ~13 degrees above horizon was the furthest away: the fireball entry point and at a much higher altitude in the smoke train. The lower one measured at ~7.25 degrees above horizon was closest to the observer(terminal burst). ~15 degrees at Flagstaff. Such elevations above horizon considering the lowest burnout at 15 miles would place the fireball termination no closer than about 75 miles North East of Flagstaff and Bellemont. If it ended at 20 miles or higher, then even farther away. That stated, it ended out in the middle of the Din`e(Navajo) and or Hopi Reservations. Please be mindful that for all intents on reservation lands you are on Sovereign Nation grounds, almost like stepping into another county. If you do some searching out there get permission first. Steve Schoner BTW: Now I need to get back to work and make some petrographic slides. What is Your Flood Risk? Protect your home from floods. Get your flood risk profile today. http://thirdpartyoffers.netzero.net/TGL3331/54399e82308eb1e820cd8st02duc __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] 10.04.14 AZ Daytime Fireball: Direct compass measurements
Hi Steve/All, First off, I want to thank you for having an all-sky camera that was operating during the daytime and captured this event. As far as I know, it is the only image/video record of the 4 October fireball itself, though of course there are many images of the smoke trail clouds. Without the video record, it would have been much more difficult to determine the bolide's true flight direction, and of course the video also provides an accurate time for the event. The timing is important, because without it one can only estimate how much time has elapsed between the event and the images of the smoke trails taken minutes later. I've spent a little over 40 hours on this fireball, unfortunately much of it wasted chasing coincidental radar returns that were aligned with the fireball's NE azimuth from Flagstaff. Initially these radar returns looked promising because they were at a reasonable range from Flagstaff for a typical fireball terminal altitude (25-35 km), and they appeared in the scans immediately following the event (which we knew thanks to Steve's camera). As encouraging as the timing and location of the radar hits were, there were reasons for concern. Hits at roughly the same location but at lower altitude were present well before and after the meteor occurred, which I initially ascribed to bad luck. But with the known reduced sensitivity of NEXRAD over the last couple years, I should have raised the red flag a bit higher than I did. Bottom line is that these radar hits are spurious and unrelated to the fall. The reason I know this is that I've got decent triangulation solutions for the smoke trail images combined with Steve's video which put the terminal altitude MUCH lower than is typical: certainly less than 20 km, and possibly as low as 15 km! We also know the entry angle was very steep, in a roughly NE to SW direction, based on parallax between the various sites. For instance, Steve's camera saw the fireball start at an elevation of about 25 degrees, azimuth ~50 degrees. The terminus was at around an azimuth of 46.5-degrees (pending refinement of my calibration solution for Steve's camera). Steve mentioned that with a compass he measured a terminal azimuth of 43 degrees, but I'm pretty confident it's a few degrees more than this. We'll eventually track down the source of the discrepancy. (For instance, the magnetic declination for Flagstaff is 10.76 degrees -- about a quarter degree higher than the 10.5 he used, so that will increase his azimuth to ~43.3. But that still leaves a 3-degree discrepancy.) Steve was also good enough to travel out to the Bellemont NWS site that took an image of the smoke trails several minutes after the fireball. He wrote: From: Meteorite-list [meteorite-list-boun...@meteoritecentral.com] on behalf of Steve Schoner via Meteorite-list [meteorite-list@meteoritecentral.com] Sent: Saturday, October 11, 2014 1:20 PM To: meteorite-list@meteoritecentral.com Subject: [meteorite-list] 10.04.14 AZ Daytime Fireball: Direct compass measurements Hello, all, Being that my all sky camera was damaged by lightning in July and replaced in August, and being that it did capture the image of this event near a prominent tree, I went up on the roof for direct measurements with two of my British WWII prismatic compasses. Keep in mind my node6 camera is aligned to the North Celestial Pole (North Star). The north star is a Cepheid variable, and unless it brightens to mag 2 it is very difficult to see with the All Sky camera. It's position is 10.5 degrees to the wast of the magnetic pole. Yesterday at Bellemont Weather Station right under and in line with the camera that took shots of the smoke clouds,I determined that they were at between 35 and 36 degrees magnetic readings. These reading are as close as I can determine as to the position of the clouds that day; 5 to 6 min later. But these smoke clouds might have drifted to the east in those five min and the degree readings would then be off maybe a degree or more depending on the wind speed 15 to 60 miles up. Bellemont Weather Station: Average 35.5 degrees NE add 10.5 degrees for Celestial Pole, making it 45.5 degrees NE from Celestial North. With respect to my "node6" rooftop camera, I studied the image captured and though the fireball image is small it traveled down to the right side of a pine tree on the shaded side. So with my compass in hand and taking measurements of where I think it vanished above or behind the tree I came out with 32-33 degrees NE. Flagstaff node6 All Sky Camera: Average 32.5 degrees NE add 10.5 degrees for Celestial Pole, making it 43 degrees NE. Estimated elevation above the horizon of burnout (terminal burst) from both locations determined with Bendix A-7 Bubble Sextant: -13 degrees at Bellemont. Estimated from the larger and higher elevation smoke cloud (terminal burst). The lower one measured at 7.25 degrees above horizon
[meteorite-list] 10.04.14 AZ Daytime Fireball: Direct compass measurements
Hello, all, Being that my all sky camera was damaged by lightning in July and replaced in August, and being that it did capture the image of this event near a prominent tree, I went up on the roof for direct measurements with two of my British WWII prismatic compasses. Keep in mind my node6 camera is aligned to the North Celestial Pole (North Star). The north star is a Cepheid variable, and unless it brightens to mag 2 it is very difficult to see with the All Sky camera. It's position is 10.5 degrees to the wast of the magnetic pole. Yesterday at Bellemont Weather Station right under and in line with the camera that took shots of the smoke clouds,I determined that they were at between 35 and 36 degrees magnetic readings. These reading are as close as I can determine as to the position of the clouds that day; 5 to 6 min later. But these smoke clouds might have drifted to the east in those five min and the degree readings would then be off maybe a degree or more depending on the wind speed 15 to 60 miles up. Bellemont Weather Station: Average 35.5 degrees NE add 10.5 degrees for Celestial Pole, making it 45.5 degrees NE from Celestial North. With respect to my "node6" rooftop camera, I studied the image captured and though the fireball image is small it traveled down to the right side of a pine tree on the shaded side. So with my compass in hand and taking measurements of where I think it vanished above or behind the tree I came out with 32-33 degrees NE. Flagstaff node6 All Sky Camera: Average 32.5 degrees NE add 10.5 degrees for Celestial Pole, making it 43 degrees NE. Estimated elevation above the horizon of burnout (terminal burst) from both locations determined with Bendix A-7 Bubble Sextant: -13 degrees at Bellemont. Estimated from the larger and higher elevation smoke cloud (terminal burst). The lower one measured at 7.25 degrees above horizon was the furthest away the fireball entry point. and at a much higher altitude in the smoke train. ~15 degrees at Flagstaff. Such elevations above horizon considering the lowest burnout at 15 miles would place the fireball termination no closer than about 75 miles North East of Flagstaff and Bellemont. If it ended at 20 miles or higher, then even farther away. That stated, it ended out in the middle of the Din`e(Navajo) and or Hopi Reservations. Please be mindful that for all intents on reservation lands you are on Sovereign Nation grounds, almost like stepping into another county. If you do some searching out there get permission first. Steve Schoner BTW: Now I need to get back to work and make some petrographic slides. NetZero now offers 4G mobile broadband. Sign up now. http://www.netzero.net/?refcd=NZINTISP0512T4GOUT1 __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
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Re: [meteorite-list] ADD: Please visit my new Meteorite Art Website
Jeff, Fantastic thin sections and great photography! Nice to see you on the list. John On Fri, Oct 10, 2014 at 7:36 PM, jeff hodges via Meteorite-list wrote: > Hello Everyone, > > I would like to invite you to visit my new Meteorite Art Website. > > http://hodges-jeffery.artistwebsites.com/ > > It features some of My Best Meteorite Photography in a variety of formats. > > Art Prints > Framed Prints > Canvas Prints > Acrylic Prints > Metal Prints > Greeting Cards & > Cell Phone Covers > > It is definitely worth a look, even if you don't intend on buying anything. > > If you like any of the images, Please leave comments and share them with your > friends on Facebook and Pinterest. It really helps me out a lot. > > Enjoy the show and thank you for visiting, > > Jeff Hodges > http://hodges-jeffery.artistwebsites.com/ > __ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > https://pairlist3.pair.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] ADD: Please visit my new Meteorite Art Website
Wonderful clean and well set out website...great stuff Jeff...nice images and options. Graham On Sat, Oct 11, 2014 at 12:36 AM, jeff hodges via Meteorite-list wrote: > Hello Everyone, > > I would like to invite you to visit my new Meteorite Art Website. > > http://hodges-jeffery.artistwebsites.com/ > > It features some of My Best Meteorite Photography in a variety of formats. > > Art Prints > Framed Prints > Canvas Prints > Acrylic Prints > Metal Prints > Greeting Cards & > Cell Phone Covers > > It is definitely worth a look, even if you don't intend on buying anything. > > If you like any of the images, Please leave comments and share them with your > friends on Facebook and Pinterest. It really helps me out a lot. > > Enjoy the show and thank you for visiting, > > Jeff Hodges > http://hodges-jeffery.artistwebsites.com/ > __ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > https://pairlist3.pair.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
[meteorite-list] Meteorite Picture of the Day
Today's Meteorite Picture of the Day: Ahumada (TS) Contributed by: Jeff Hodges http://www.tucsonmeteorites.com/mpodmain.asp __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
