Re: A possible satellite observation?

Jim Stamm (
Sat, 7 Aug 1999 19:23:23 -0700

I've also seen a few, and if memory serves correctly, there was 
perceptible motion in under two minutes at less than 100 power with even 
the first graze. wrote on 8/7/99 5:05 PM :

>In a message dated 8/3/99 10:32:50 PM Eastern Daylight Time, 
> writes:
>> I've never observed a grazing occultation, but I sort of wonder if the star
>>  was never actually occulted, how much it would move relative to the Moon 
>> 5
>>  minutes.  Mightn't the motion be imperceptible at least to some observers? 
>I've seen a few.  There is very little motion in 5 minutes.  Unless you are 
>using 600+ power (and have good resolution, something few amatuers have - 
>with 600x, if they can achieve it), you will not detect motion for, at the 
>very least, 5 minutes.  Consider this: the moon moves at 30 arc-minutes per 
>hour, or 30" per minute (2 and a half arc-minutes in five minutes).  A 
>scrutinizing observer theoretically could detect movement inside of 300 
>seconds, but if the star was already an arc-minute or so off the moon's 
>movement would be much less visible.
>I believe that it is very possible that this was a star.