[meteorite-list] What was the true azimuth of the Russian meteor?
List, There seem to be posted two quite different images to the list about the compass direction from where the meteor came on Friday 15, morning (local). Obviously one of them must be wrong. Surprising if the weather image is wrong, how did that come about? Which one is closest to the direction used by Esko to compute the orbital elements? And which is the true direction? Would be important to clarify this. North is up in both images. Chelyabinsk is in the mid top at the lower one, and near the middle in the top image. The top image suggest azimuth 80 degree, while the lower about 120 degree. Here is a link to the two differing directions stitched together: home.online.no/~bsoerhei/astro/meteor/metlist/twoaz.jpg Bjørn Sørheim __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] What was the true azimuth of the Russian meteor?
The meteor came from the east (where the Sun was rising). Where did you get the image at the bottom? Everything I have seen about this has said or showed (in videos) that it came from near the Sun and was travelling to the west. Bob -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Bjorn Sorheim Sent: Sunday, February 17, 2013 11:52 AM To: meteorite-list@meteoritecentral.com Subject: [meteorite-list] What was the true azimuth of the Russian meteor? List, There seem to be posted two quite different images to the list about the compass direction from where the meteor came on Friday 15, morning (local). Obviously one of them must be wrong. Surprising if the weather image is wrong, how did that come about? Which one is closest to the direction used by Esko to compute the orbital elements? And which is the true direction? Would be important to clarify this. North is up in both images. Chelyabinsk is in the mid top at the lower one, and near the middle in the top image. The top image suggest azimuth 80 degree, while the lower about 120 degree. Here is a link to the two differing directions stitched together: home.online.no/~bsoerhei/astro/meteor/metlist/twoaz.jpg Bjørn Sørheim __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list - No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.2899 / Virus Database: 2639/6110 - Release Date: 02/17/13 __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] What was the true azimuth of the Russian meteor?
Hi Bob The bottom image was posted to the list with two others showing closer up projection on a map of The Chelyabinsk area. They all three show the roughly 120 degree azimuth entry. They seems to be detailed and some level of work behind. The Sun at this time would rise in the region at 100-110 degree azimuth, I estimate. The image come from a posting to the list about a day ago, titled: Russian progress on trajectory posted by Robin Whittle Bjørn Sørheim - The meteor came from the east (where the Sun was rising). Where did you get the image at the bottom? Everything I have seen about this has said or showed (in videos) that it came from near the Sun and was travelling to the west. Bob -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Bjorn Sorheim Sent: Sunday, February 17, 2013 11:52 AM To: meteorite-list@meteoritecentral.com Subject: [meteorite-list] What was the true azimuth of the Russian meteor? List, There seem to be posted two quite different images to the list about the compass direction from where the meteor came on Friday 15, morning (local). Obviously one of them must be wrong. Surprising if the weather image is wrong, how did that come about? Which one is closest to the direction used by Esko to compute the orbital elements? And which is the true direction? Would be important to clarify this. North is up in both images. Chelyabinsk is in the mid top at the lower one, and near the middle in the top image. The top image suggest azimuth 80 degree, while the lower about 120 degree. Here is a link to the two differing directions stitched together: home.online.no/~bsoerhei/astro/meteor/metlist/twoaz.jpg Bjørn Sørheim __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] What was the true azimuth of the Russian meteor?
Hi Bjørn, In the videos, the meteor is first seen above and to the left of the rising sun, so that would mean that it was further north than the rising sun. If you estimate the sun to be rising between 100-110 degrees azimuth, then the meteor would be less than 100 degrees, so the 80 degree estimate would be correct. Unless, the sun was still far below the horizon and therefore was further north relative to the video's angle. Maybe some of the experts can step in and let us know what the azimuth really was. Regards, Bob -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Bjorn Sorheim Sent: Sunday, February 17, 2013 1:27 PM To: meteorite-list@meteoritecentral.com Subject: Re: [meteorite-list] What was the true azimuth of the Russian meteor? Hi Bob The bottom image was posted to the list with two others showing closer up projection on a map of The Chelyabinsk area. They all three show the roughly 120 degree azimuth entry. They seems to be detailed and some level of work behind. The Sun at this time would rise in the region at 100-110 degree azimuth, I estimate. The image come from a posting to the list about a day ago, titled: Russian progress on trajectory posted by Robin Whittle Bjørn Sørheim - The meteor came from the east (where the Sun was rising). Where did you get the image at the bottom? Everything I have seen about this has said or showed (in videos) that it came from near the Sun and was travelling to the west. Bob -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Bjorn Sorheim Sent: Sunday, February 17, 2013 11:52 AM To: meteorite-list@meteoritecentral.com Subject: [meteorite-list] What was the true azimuth of the Russian meteor? List, There seem to be posted two quite different images to the list about the compass direction from where the meteor came on Friday 15, morning (local). Obviously one of them must be wrong. Surprising if the weather image is wrong, how did that come about? Which one is closest to the direction used by Esko to compute the orbital elements? And which is the true direction? Would be important to clarify this. North is up in both images. Chelyabinsk is in the mid top at the lower one, and near the middle in the top image. The top image suggest azimuth 80 degree, while the lower about 120 degree. Here is a link to the two differing directions stitched together: home.online.no/~bsoerhei/astro/meteor/metlist/twoaz.jpg Bjørn Sørheim __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list - No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.2899 / Virus Database: 2639/6110 - Release Date: 02/17/13 __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] What was the true azimuth of the Russian meteor?
Bob, The link below support strongly (from Robin Whittle post, thanks to him) the trajectory of the lower image in my first link. From the videos it is found that the bolide travelled almost right overYemanzhelinsk which is south of Korkino, which are two suburbs south of Chelyabinsk. Then continuing straight to the Lake Chebarkul impact site. So a roughly 120 azimuth path seems the correct one, bending slightly to the west after an explosion near Yemanzhelinsk. That means it came actually from southeast, not from northeast! Why the Meteosat 9 image (top one) is so far off, I can't explain. It was taken at 9:15, so is it really showing the meteor cloud? It seems to have an enormous size also, when considering the scale of the image. The video of the meteor travel in the link below indicates that one was shot at 9:20:28 forwards. Using SkyMap Pro I get a sunrise time of 9:16:33 and an azimuth for the sun at 9:20:20 at 111 deg 48', as seen from the suburb Yemanzhelinsk, so not far off my estimate. ogleearth.com/2013/02/reconstructing-the-chelyabinsk-meteors-path-with-google-earth-youtube-and-high-school-math Bjørn Sørheim Hi Bjørn, In the videos, the meteor is first seen above and to the left of the rising sun, so that would mean that it was further north than the rising sun. If you estimate the sun to be rising between 100-110 degrees azimuth, then the meteor would be less than 100 degrees, so the 80 degree estimate would be correct. Unless, the sun was still far below the horizon and therefore was further north relative to the video's angle. Maybe some of the experts can step in and let us know what the azimuth really was. Regards, Bob -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Bjorn Sorheim Sent: Sunday, February 17, 2013 1:27 PM To: meteorite-list@meteoritecentral.com Subject: Re: [meteorite-list] What was the true azimuth of the Russian meteor? Hi Bob The bottom image was posted to the list with two others showing closer up projection on a map of The Chelyabinsk area. They all three show the roughly 120 degree azimuth entry. They seems to be detailed and some level of work behind. The Sun at this time would rise in the region at 100-110 degree azimuth, I estimate. The image come from a posting to the list about a day ago, titled: Russian progress on trajectory posted by Robin Whittle Bjørn Sørheim - The meteor came from the east (where the Sun was rising). Where did you get the image at the bottom? Everything I have seen about this has said or showed (in videos) that it came from near the Sun and was travelling to the west. Bob -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Bjorn Sorheim Sent: Sunday, February 17, 2013 11:52 AM To: meteorite-list@meteoritecentral.com Subject: [meteorite-list] What was the true azimuth of the Russian meteor? List, There seem to be posted two quite different images to the list about the compass direction from where the meteor came on Friday 15, morning (local). Obviously one of them must be wrong. Surprising if the weather image is wrong, how did that come about? Which one is closest to the direction used by Esko to compute the orbital elements? And which is the true direction? Would be important to clarify this. North is up in both images. Chelyabinsk is in the mid top at the lower one, and near the middle in the top image. The top image suggest azimuth 80 degree, while the lower about 120 degree. Here is a link to the two differing directions stitched together: home.online.no/~bsoerhei/astro/meteor/metlist/twoaz.jpg Bjørn Sørheim __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] What was the true azimuth of the Russian meteor?
Hi Bjorn, I've been gone on vacation for 5 days so I don't know if your question below was adequately answered yet, but there is no discrepancy between the two pictures. As I pointed out last week in one of my posts, while the trajectory "appears" to be parallel to the Kazakhstan/Russian border in the Meteosat-9 image, the meteor was NOT travelling parallel to the ground, so its ground track was definitely oriented more clockwise than the ~80-degree azimuth of the country border. From Meteosat 9's perspective, the bolide was very nearly on the limb, so you are seeing it severely foreshortened. More importantly, the east end of the contrail (right side) is at a higher altitude than the west end. As a result, when you project the 3D track down to the ground, it will actually start on the Kazakhstan side of the border. --Rob -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Bjorn Sorheim Sent: Sunday, February 17, 2013 10:52 AM To: meteorite-list@meteoritecentral.com Subject: [meteorite-list] What was the true azimuth of the Russian meteor? List, There seem to be posted two quite different images to the list about the compass direction from where the meteor came on Friday 15, morning (local). Obviously one of them must be wrong. Surprising if the weather image is wrong, how did that come about? Which one is closest to the direction used by Esko to compute the orbital elements? And which is the true direction? Would be important to clarify this. North is up in both images. Chelyabinsk is in the mid top at the lower one, and near the middle in the top image. The top image suggest azimuth 80 degree, while the lower about 120 degree. Here is a link to the two differing directions stitched together: home.online.no/~bsoerhei/astro/meteor/metlist/twoaz.jpg Bjørn Sørheim __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list