[meteorite-list] Detectability

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Mon, 7 Sep 2009 15:13:21 -0700 (PDT)
Message-ID: <226877.15145.qm_at_web36907.mail.mud.yahoo.com>

Richard -

Thanks much again. Great work with TC3.

I am assuming that TC3 also had an orbit that created a detectable arc with your image analysis algorithm. Would a cometessimal directly inbound on a long period or short period orbit do so?

The problem is to take that 19.0V and turn it into a detection limit estimate for an inbound 30 meter carbonaceous chondrite, and further to turn that limit into an estimate of warning time. Sadly, those maths are well beyond me now.

Ed


--- On Mon, 9/7/09, Richard Kowalski <damoclid at yahoo.com> wrote:

> From: Richard Kowalski <damoclid at yahoo.com>
> Subject: Re: Detectability
> To: "E.P. Grondine" <epgrondine at yahoo.com>
> Cc: meteorite-list at meteoritecentral.com
> Date: Monday, September 7, 2009, 5:03 PM
> Ed,
>
> checking my observing report from 6 October, 2008, the
> night of discovery, the conditions were far from perfect and
> the seeing wasn't that great. I reported it as 2.3
> arcseconds full width half max for the night.
>
> The night before was cloudy and I didn't head up to the
> observatory. The night of impact the seeing was only
> slightly better, but highly variable and both of these
> nights were windy. Perfect nights have sub-arcsecond seeing
> and our fwhm (1 arcsec pixels) is <1.8
>
> With the 1.5-m we can reach 19.0V with good SNR using a
> 5-second exposure AT Nautical Twilight.
>
> --
> Richard Kowalski
> http://fullmoonphotography.net
> IMCA #1081
>
>
> --- On Mon, 9/7/09, E.P. Grondine <epgrondine at yahoo.com>
> wrote:
>
> > From: E.P. Grondine <epgrondine at yahoo.com>
> > Subject: Detectability
> > To: damoclid at yahoo.com
> > Cc: meteorite-list at meteoritecentral.com
> > Date: Monday, September 7, 2009, 2:44 PM
> > Hi Richard -
> >
> > Thanks for the information, and congratulations on
> TC3.
> >
> > I make that 320,000 miles something like 2 hours if it
> had
> > of been on a direct intercept orbit. I am assuming you
> had
> > nearly perfect sky conditions as well at your
> observatory.
> >
> > I think this one is going to turn into photons in a
> bucket
> > and sky conditions.
> >
> > The items of interest are cometessimals, the smallest
> > around 30 meters with 5 kilton impact force by my
> current
> > estimate, with 2 joined cometissimals around 60 meters
> and
> > 15 megatons of impact force. (But I have been wrong
> before,
> > and reserve the right to be wrong in the future.)
> >
> > No one in NASA seems to know what happened to the
> CAPS
> > analysis. It is probably sitting on a shelf somewhere
> with
> > the Apollo 11 Moon walk slowscan tapes.
> >
> > E.P. Grondine
> > Man and Impact in the Americas
> >
> >
> >
> >
>
>
>
>


      
Received on Mon 07 Sep 2009 06:13:21 PM PDT