AW: [APML] 1998 WT24 and NGC 891

["Ulrich Beinert" <analemma@gmx.de>]

Hi Radu,

thanks for the tip, but unfortunately (as always), it was cloudy on Sunday
night. I also don't believe that I would have got the asteroid on film (one
of those rare times that a CCD camera is something good ;-)

Ulrich

-----Ursprüngliche Nachricht-----
Von: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]Im
Auftrag von Radu Corlan
Gesendet: Donnerstag, 13. Dezember 2001 02:44
An: astro-photo@seds.org
Betreff: Re: [APML] 1998 WT24 and NGC 891


On Wed, 12 Dec 2001, Ulrich Beinert wrote:

> The near-earth asteroid 1998WT24 will have a very close encounter with NGC
> 891 as seen from Europe near midnight on Sunday evening (Monday morning).
At
> that time, the asteroid will be moving at nearly 1 arcsecond per second
(! -
> one degree per hour). I'll try to capture the encounter with my 125mm Borg
> scope at either f/6.4 or f/4. I'm just wondering if the asteroid will even
> leave a trail if it's going that fast. Its visual magnitude at the time
will
> be 10m, and I'll be using Kodak Elite Chrome 200 film. What do you think?

Think about it this way: at 500mm fl, it will take about 8'' for the
asteroid to travel 20u on the film (star size on E200). So, if you can
reach mag 10 in 5-10sec, you'll probably get a trail. The trick will be to
get the right total exposure just rignt to push the background over the
knee of the film without washing out the asteroid trail - i'd rather use
negative film and the shortest exposure that still brings out the galaxy.

Radu

>
> Ulrich
>
>
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-------------
Radu Corlan           Snail Mail: Bucuresti sect. 1,
rcorlan@pcnet.ro             str. Argentina nr. 28, 71206 Romania

   You can still escape the "Gates" of Hell!
                 Use Linux!
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