[meteorite-list] What was the true azimuth of the Russian meteor?

From: Bjorn Sorheim <astrogeo_at_meteoritecentral.com>
Date: Mon, 18 Feb 2013 01:13:25 +0100
Message-ID: <6.2.1.2.2.20130218005016.03bd16b0_at_pop.online.no>

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

Bj?rn S?rheim

------------------------------------------------
Hi Bj?rn,

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-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Bjorn
Sorheim
Sent: Sunday, February 17, 2013 1:27 PM
To: meteorite-list at 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


Bj?rn S?rheim

-------------------------------------
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-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Bjorn
Sorheim
Sent: Sunday, February 17, 2013 11:52 AM
To: meteorite-list at 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

Bj?rn S?rheim
Received on Sun 17 Feb 2013 07:13:25 PM PST