Re: [APML] 1998 WT24 and NGC 891

[Radu Corlan <rcorlan@pcnet.ro>]

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, 
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