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A look at the total number of pixels above the triggering threshold shows most of the light was released during it’s terminal flares.<\/p>\n
![\"Total](\"https:\/\/bcmeteors.net\/wp\/wp-content\/uploads\/2010\/08\/PixTrig20080219.jpg\")
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The graphs as well as the movie was sent to Dr. Alan Hildebrand, Coordinator of the Canadian Fireball Reporting Centre, University of Calgary.<\/p>\n
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Since the bolide was large enough and slow enough to be a potential meteorite producer a hand held compass was held over the lens of the camera and a bearing shot to a landmark in the image. Brower’s best estimation was 166 degrees true.<\/p>\n
![\"first](\"https:\/\/bcmeteors.net\/wp\/wp-content\/uploads\/2010\/08\/firstbearing.jpg\")
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Later in the morning Alan Hildebrand informed me that another all sky camera, located near Calgary, Alberta, caught the event low on its horizon. By noon TV stations is Vancouver, Calgary, Spokane and Seattle were running video footage from the West Kelowna Sentinel camera as well as a much better video of the terminal burst caught on a security camera at an Idaho Air National Guard base <\/a>(copyright AP and Idaho National Air Guard 20080).<\/p>\n I did a crude plot of the bearings and came up with the following map.<\/p>\n \u00a0<\/p>\n Hildebrand coordinated the data collection and determined the most likely fall site was in the northeastern part of Oregon in the mountain wilderness area. A week later the bolide sighting was old news.<\/p>\n \u00a0<\/p>\n <\/p>\n \u00a0<\/p>\n On June 15, 2009 I revived an e-mail from Dr. Kirstoffer Walker of the Scripps Institute of Oceanography near San Diego, California. Kris stated he had been using the data from the USArray, a large network of seismic and infrasound<\/a> stations. Kris requested the data recorded by the Sentinel camera. In return Kris shared his data. His results are remarkable and show that the USArray can be a very important tool in locating a fall site and provide an additional source for altitude information.<\/p>\n Kris derived three closely clustered locations, see below, with a 95% confidence ellipse. Note my initial estimation of 166 degrees turned out to be fairly accurate. The ambiguity in exact the location as I understand it, comes from an uncertain of the time accuracy of the sensors as well as my camera’s time stamp. The three loci are calculated for the following event times: 13:30:01 13:30:23 13:30:39 UTC.<\/p>\n Kris produced a very interesting animation of the pressure waves converging<\/a> as seen by all stations within 250 km of the event.<\/p>\n The altitude estimate are likewise scattered as they are also dependent on the time line:<\/p>\n \u00a0<\/p>\n The British Columbia Meteor Network, with it’s evolving triangulation capability, now has a new tool to aid in fireball analysis and the possibly recovery of meteorites.<\/p>\n To read more about meteors and infrasound please download this pdf<\/a>. In it you’ll find information on the University of Western Ontario’s Meteor Infrasound Observatory.<\/p>\n \u00a0<\/p>\n","protected":false},"excerpt":{"rendered":" On February 19, 2008 at 13:30 UT, a large fireball entered the earth’s upper atmosphere. Visual reports of the bolide started streaming in at police stations and television stations. A regional airline pilot filed a report of a possible aircraft going down over western Washington. At 13:30:59 UT the West Kelowna Sentinel all-sky camera caught … Continue reading “2008 02 19 PNW Bolide”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":228,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[41],"tags":[],"class_list":["post-236","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-video-results"],"_links":{"self":[{"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/posts\/236","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=236"}],"version-history":[{"count":0,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/posts\/236\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/media\/228"}],"wp:attachment":[{"href":"https:\/\/bcmeteors.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"Infrasound](\"https:\/\/bcmeteors.net\/wp\/wp-content\/uploads\/2010\/08\/comparebearings.jpg\")
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