(meteorobs) Whitmire, SC likely fall location
Marc Fries
mfries8 at hotmail.com
Wed Feb 15 20:41:13 EST 2012
Still? ;-)
On 2/15/12 4:06 PM, Stuart McDaniel wrote:
> I am only about 50 miles from the drop zone.
> Stuart McDaniel
> Lawndale, NC
> Secr.,
> Cleve. Co. Astronomical Society
> IMCA #9052
>
> http://spacerocks.weebly.com
> *From:* Jim Wooddell <mailto:nf114ec at npgcable.com>
> *Sent:* Wednesday, February 15, 2012 5:02 PM
> *To:* Meteor science and meteor observing
> <mailto:meteorobs at meteorobs.org>
> *Subject:* Re: (meteorobs) Whitmire, SC likely fall location
> Okay guys...here the real scoop! Too Funny!
> http://weeklyworldnews.com/headlines/44055/ufo-over-south-carolina/
> I am not signing this!
>
> ----- Original Message -----
> *From:* Jake S <mailto:jakeschaeferml at gmail.com>
> *To:* Meteor science and meteor observing
> <mailto:meteorobs at meteorobs.org>
> *Sent:* Wednesday, February 15, 2012 2:35 PM
> *Subject:* (meteorobs) Whitmire, SC likely fall location
> The data from the seismographs, coupled with the allsky camera
> lead to an estimated trajectory that does point towards those
> radar hits. They are definitely within the uncertainty/error bounds.
>
>
> On Wed, Feb 15, 2012 at 12:24 PM, Mike Hankey
> <mike.hankey at gmail.com <mailto:mike.hankey at gmail.com>> wrote:
> > Hey Rob,
> >
> > If you wouldn't mind sending me the kmzs for this, i'm
> interested to see
> > what a good meteorite return looks like.
> >
> > Thanks,
> >
> > Mike
> >
> > On Wed, Feb 15, 2012 at 12:54 PM, Matson, Robert D.
> > <ROBERT.D.MATSON at saic.com <mailto:ROBERT.D.MATSON at saic.com>> wrote:
> >>
> >> Hi All,
> >>
> >> I found the confirming radar hits (from two radars) yesterday
> >> afternoon -- I can send the .KMZ files to anyone that is
> >> interested. They are definitely associated with the fall.
> >> The reflectivity, velocity and spectral returns all have
> >> the "candystriping" that Marc Fries and I have come to
> >> associate with past confirmed meteorite falls.
> >>
> >> The location is not as bad as it could be. Yes, lots of
> >> forest, but also many cleared areas due to the nearby
> >> town of Whitmire, SC. --Rob
> >>
> >> -----Original Message-----
> >> From: meteorobs-bounces at meteorobs.org
> <mailto:meteorobs-bounces at meteorobs.org> on behalf of Esko Lyytinen
> >> Sent: Wed 2/15/2012 2:57 AM
> >> To: Meteor science and meteor observing
> >> Subject: Re: (meteorobs) [meteorite-list] GA SC Bolide seems
> have produced
> >> a large rock
> >>
> >>
> >> I made a one station analysis of the Lawndale camera video.
> >>
> >> The camera was calibrated with eight found stars. And a number
> of frames
> >> were manually measured.
> >> A direct fit to the timed directions gives the apparent entry
> direction
> >> approximately. In this a reasonable looking deceleration was
> taken into
> >> account.
> >> Some level "scaling" can be got by means of an assumed
> beginning height,
> >> consistent with the resulting velocity, with a few iterations.
> >> I get it arriving form az-direction around 315 or 325 . The entry
> >> velocity seems to be about 13 km/s having then he beginning
> height at
> >> around 80 or 85 km.
> >>
> >> The reulting landing site from this model is very close to Jake's
> >> southers radar "group". I tried a further velocity (and connected
> >> beginnig height fit) and with the entry velocity of 13.4 km/s
> (in this
> >> model arriving from direction 319) with resulting beginning
> height of
> >> about 85 km. Now there is an almost exact hit! The end height
> in this is
> >> 26 km. Camera calibration at low elevation angles may be not so
> good
> >> affecting some uncertainty to this.
> >> Also a resonable rough dark flight was modeled. In this the
> landing is
> >> 13.8 km before the sea-level crossing of the direct track.
> >> Then the prediction from this would be a few kilometer to the
> West of
> >> the radar hits.
> >>
> >> Wind effects are not taken into account and may well affect this.
> >> Just now the server in Wyoming tell
> >>
> >> "Sorry, the server is too busy to process your request.
> >> Please try again later."
> >>
> >> when trying to get the atmospheric sounding data.
> >>
> >> I am practically confident that these "southern" radar hits are
> from
> >> this. It would be good to know the exact time of the radar hits.
> >> In my opinion the northern hit it less probabaly from this.
> >>
> >> No reliable end deceleration is derived from this. And from
> only one
> >> station data, this may not be got quite reilably. Ablation
> model would
> >> give a reasonable end mass for this velocity and end height of
> around 5
> >> kg (if OC). But if this was strongly fragmented in early
> flight, as may
> >> well have happened, considering the bright flashing, this mass
> value may
> >> rather suit to the biggest mass(es) and the total end mass may
> be bigger.
> >>
> >> The fall-time to the radar height would be telling on the
> masses of these.
> >>
> >> Regards,
> >> Esko
> >>
> >>
> >> > Here is my analysis of this meteor:
> >> >
> >> > http://3dradar.wordpress.com/2012/02/15/sc-2132012-at-642-utc/
> >> >
> >> > I think there is a chance there could be meteorites from this
> event. I
> >> > think it is highly misleading to say it "produced a large
> meteorite"
> >> > when nothing has been found yet...
> >> >
> >> > I think the radar hits probably need further scrutiny (Marc
> Fries, Rob
> >> > Matson?) but it seems from what I see, this meteor deserves a
> bit more
> >> > attention?
> >> >
> >> > - Jake
> >>
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> >>
> >
> >
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