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Focal Ratio For Asteroids

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Posted by John Huggins on April 12, 2001 11:47:25 UTC

Okay, let me refine this.

I understand that higher focal ratios (f/15) are quite useful for planetary work. It seems the planet brightness helps compensate for the lower telescope brighness as compared to f/6.

How about asteroids? I don't really want to resolve their shape. I just want to measure their magitude. I have seen telescopes meant for asteroid work with high focal ratios. I would think lower focal ratio designs would be more useful with the brighter image.

What am I missing here?


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