Posts Made By: Maurice Clark

Hi Darian,

It is broadcast over my university radio station here in PA. (Didn't someone recently claim that all universities were leftist???)

I have listened to some segments occassionly, but quite frankly, he is an arrogant SOB who is only out for his own glory and who is not the slightest bit interested in truth or reason.

Cheers,

Maurice

Hi David,

From my understanding of the Bible, Satan forever sealed his doom when Jesus died on the cross. Also Revelation makes it very clear that Satan will be destroyed in the lake of fire at the end of the world.

I would imagine that God gave Satan every opportunity for Satan to repent. However when you read the Bible, the hatred of Satan for God is very clear.

Regards,

Maurice

Hi all,

As someone who watches US politics only for amusement, I actually hope that Bu$h does lose the election this year. It could be even more amusing to read what certain persons would post. Assuming they would stick around to hear all of the "I told you so's".

However if Bu$h DOES win, can you imagine what the posts would be like!!????

Cheers,

Maurice

Hi Charlie,

I have seen graphs which detail what sort of exposures are required to reach certain limiting magnitudes with a certain type of CCD/telescope, however I cannot find them att he moment.

One thing that you can use however is the limiting magnitude calculator at the website below. With it you can enter various parameters and see what magnitude results.

In theory, you can keep on adding exposures to reach whatever magnitude you want, however the magnitude/exposure curve very quickly flattens out and MUCH longer exposures are required for only a little gain. (Somewhat like increasing the scope size to improve your visual LM. You have to more than double the size to gain 1 magnitude.)

Regarding Herbert's comments, noise is not your problem. That can easily be removed with dark frames. I have taken 60 minute exposures with an ST9 without any problems. (though taking the darks is a pain!) What WILL limit you is the sky background. If it is bright, then you will quickly start to fill up the pixel wells and leave little room for the signal. This is why combining short exposures can do better than a single long exposure.

Hope this helps,

Maurice

http://stupendous.rit.edu/richmond/signal.shtml

Hi Charlie,

In taking the 60 minute expsoures, I was using an 8" LX200. I also have a C14, but as yet have not tried anything longer than 10 minutes with it.

However, to give you some idea of what you can expect, below is an image that is a combination of 82 3-minute images from a night that I was working on an asteroid. (The angled streak in the upper right.) The star indicated by the lines is magnitude 15.3. The limiting magnitude is around 20. I also have some 5 minute images of NGC 2903, but have not processed them yet.

Hope this helps,

Regards,

Maurice

I want one!!!!!!!

But how do I hide it from the family treasurer!!!!!!!

Maurice

Hi Paul,

At least you had clear skies! Here it was fine and clear until around 8.30pm. The the clouds rolled in! :-((((

Maurice

What does the 4th of January have to do with the title? :^)

Maurice

Hi Anthony,

Thanks for the link. Some of those are great!

Maurice

Hi Mark,

I managed to dig out an old photo of it that I took several years ago.

It is a 30 minute exposure using a 300mm f/2.8 Pentax lens and Kodak Ektachrome wide format silde film.

Cheers,

Maurice