[meteorite-list] 2011 MD Animation

From: Sterling K. Webb <sterling_k_webb_at_meteoritecentral.com>
Date: Tue, 28 Jun 2011 16:04:43 -0500
Message-ID: <86AAD7F00B744E46A1C59808E20175AB_at_ATARIENGINE2>

Hi, John, List,

Richard got to the hot pixel answer before me (naturally),
but some clues are the the absolute fixity of their positions,
their unchanging brightness, and the fact that they are
scattered all over the frame. If they were "real" objects
and true "companions," they would be of low mass compared
with 2011MD. They would be in orbit around 2011MD. In
nearly five hours motions would be apparent. And... they
would be much closer.

Asteroidal masses do not have companions; they have
"moons." There are at least 180 asteroids with "moons"
that are known and probably many thousands more.
http://en.wikipedia.org/wiki/Minor_planet_moon


Sterling K. Webb
-------------------------------------------------------------------------------------
----- Original Message -----
From: "John Hendry" <pict at pict.co.uk>
To: "Richard Kowalski" <damoclid at yahoo.com>; "meteorite list"
<meteorite-list at meteoritecentral.com>
Sent: Tuesday, June 28, 2011 10:04 AM
Subject: Re: [meteorite-list] 2011 MD Animation


I'm counting what appear to be 17 fainter companion objects in parallel
trajectories. Is that what I'm looking at or is it some sort of video
artefact? If they are companions can their size be determined
approximately from the relative brightness or by some other means?
Thanks,
John


On 28/06/2011 01:24, "Richard Kowalski" <damoclid at yahoo.com> wrote:

>I got a few positional images of this object with our 1.5-m (60") on
>Mt.
>Lemmon last night, but Jure Skvarc at the Crni Vrh Observatory in
>Slovenia obtained one of the nicer time lapse animations of the
>asteroids
>motion against the background stars.
>
>
>He writes on his Youtube page:
>
>"The images for this animation were taken using a 60-cm telescope from
>the Crni Vrh Observatory on the night of 26 July 2011. Each exposure
>was of 15 seconds. The telescope was tracking on the asteroid,
>changing
>the rate of tracking between exposures. The entire sequence lasted
>about 4h40m, during which 635 exposures were made. At the time the
>asteroid was less than 200000 km from Earth. At the closest approach
>some 15 hours later the distance was about 20000 km."
>
>4 hours, 40 minutes of imaging the NEO until his dawn, compressed down
>to
>43 seconds. Enjoy
>
>
>http://www.youtube.com/watch?v=p-pv18xDWCY
>
>
>--
>Richard Kowalski
>Full Moon Photography
>IMCA #1081
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Received on Tue 28 Jun 2011 05:04:43 PM PDT