[meteorite-list] Chebarkul/Chelyabinsk - Trajectory Update - IAU release

From: Craig Moody <meteoritesnorth_at_meteoritecentral.com>
Date: Mon, 25 Feb 2013 10:26:55 -0500
Message-ID: <SNT133-W539B86DDE7EFF302BC76D3CCF30_at_phx.gbl>

Now that is some detailed data! Thanks Mike.
Looks like it is time to put some fresh magnets on the stick! Hunting season has started early! Go get 'em guys and gals!
May the Schwartz be with you!
----------------------------------------
> Date: Mon, 25 Feb 2013 09:51:46 -0500
> From: meteoritemike at gmail.com
> To: meteorite-list at meteoritecentral.com
> Subject: [meteorite-list] Chebarkul/Chelyabinsk - Trajectory Update - IAU release
>
> I'm not sure if this was posted yet or not. It was just sent to the
> IAU yesterday.
>
> Electronic Telegram No. 3423
> Central Bureau for Astronomical Telegrams
> INTERNATIONAL ASTRONOMICAL UNION
> CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University;
> 20 Oxford St.; Cambridge, MA 02138; U.S.A.
> e-mail: cbatiau at ... (alternate cbat at ...)
> URL http://www.cbat.eps.harvard.edu/index.html
> Prepared using the Tamkin Foundation Computer Network
>
>
> TRAJECTORY AND ORBIT OF THE CHELYABINSK SUPERBOLIDE
> Jiri Borovicka, Pavel Spurny, and Lukas Shrbeny, Astronomical Institute
> of the Academy of Sciences, Ondrejov, Czech Republic, report that they have
> computed the atmospheric trajectory and velocity of the superbolide of 2013
> Feb. 15.139 UT (3h20m UT), which caused some damage in the city of
> Chelyabinsk, Russia. They used seven casual video records provisionally
> calibrated with Google Maps tools. The trajectory was assumed to be linear.
> The geographical coordinates of selected points along the trajectory are as
> tabulated below:
>
> Relative Longitude Latitude Height Velocity Notes
> Time (s) (deg E) (deg N) (km) (km/s)
>
> 0.00 64.266 54.508 91.83 17.5 beginning of
> registration
> 9.18 61.913 54.788 41.02 17.5 minor flare
> 11.20 61.455 54.836 31.73 17.5 major flare
> 12.36 61.159 54.867 25.81 17.5 flare
> 13.20 60.920 54.891 21.05 12.5 minor flare
> 16.20 60.606 54.922 14.94 4.3 end of
> registration
>
> The observed trajectory was 254 km long. The azimuth of the trajectory was
> 279.5 degrees, and the slope was 16.5 degrees to the horizontal (for the end
> point). The uncertainty of the radiant is about one degree. The uncertainty
> of the position of the trajectory is about 1 km (at the beginning, up to 4
> km).
> The pre-entry object that caused the superbolide was relatively fragile.
> Severe fragmentation started at a height of 32 km under dynamic pressure of 4
> MPa. The mass of the largest fragment, which landed in the lake Chebarkul,
> was estimated to be 200-500 kg. One or two meteorites of the mass of several
> tens of kg can be expected not far from the village Travniki. One piece of
> mass approximately 1 kg may have landed to the northwest of Shchapino.
> Numerous small fragments can be expected in the wide band located about 5 km
> south of the trajectory, mostly between longitudes 60.9 and 61.35 degrees.
> The blast wave, which strongly affected Chelyabinsk, was generated
> between heights of 25 and 30 km. The radiant and heliocentric orbit were
> calculated to be as follows:
>
> Apparent radiant: Right ascension 328.6 +/- 1.0 deg
> (equinox 2000.0) Declination +8.0 +/- 1.0 deg
> Velocity 17.5 +/- 0.5 km/s
>
> Geocentric radiant: Right ascension 334.7 +/- 1.2 deg
> Declination -1.0 +/- 1.4 deg
> Velocity 13.2 +/- 0.7 km/s
>
> Orbit: a = 1.55 +/- 0.07 AU e = 0.50 +/- 0.02
> q = 0.768 +/- 0.011 AU Q = 2.33 +/- 0.14 AU
> (equinox 2000.0) Peri. = 109.7 +/- 1.8 deg Node = 326.41 deg
> i = 3.6 +/- 0.7 deg
>
> The data do not allow determination of the initial mass of the object prior
> to entering the atmosphere. The trajectory will be further refined in the
> future, provided that proper in situ calibrations of the videos are made.
>
>
> NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
> superseded by text appearing later in the printed IAU Circulars.
>
> (C) Copyright 2013 CBAT
> 2013 February 23 (CBET 3423) Daniel W. E. Green
>
>
>
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Received on Mon 25 Feb 2013 10:26:55 AM PST