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M109 and M108 ?????

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#1 Guest_**DONOTDELETE**_*

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Posted 22 April 2004 - 03:04 PM

Last night I looked for M108 and M109 with 15x80mm binos. I had clear skys and OK lp...Are these simply to dim? They are both around magnitude 10..

Advice?

#2 EdZ

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Posted 22 April 2004 - 03:33 PM

Check some sources for the surface brightness. M109, IIRC, doesn't have much of a core. So that mag is really spread out. SB would be very low. M108 has a mottled appearance, also no core. These might be pretty tough in binocs.

edz

#3 Fiske

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Posted 23 April 2004 - 09:09 AM

tc2:

I have observed both with 8x42mm binos from a good dark sky site. They weren't easy at that aperture, and I've had a lot of experience with small bino observing. I was also using a pair of Nikon Venturer LXs, which is about as good as it gets in a small bino. :)

In 15x80s, they shouldn't be too difficult as long as you are working from a dark site and know *precisely* where to look. You probably won't be able to just sweep them up. You'll need to carefully star hop to them from a good chart like the Sky Atlas 2000 or Herald-Bobroff.

#4 lighttrap

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Posted 24 April 2004 - 09:07 AM

FWIW, I've never managed either M108 or M109 with mounted Fujinon 16x70s. Those, and M88-91 and M58-59 and M97-99 seem out of reach from my semi-suburban, semi-light polluted backyard even on those exceedingly rare good clear nights. Recently, it's been so cloudy that I'd settle for a peek at M31, M42 or M45.

I used to have this idea that if I tried hard enough, I could bag all of the M objects with handheld 12x50s. But, the reality is that I'm still lacking quite a few with mounted 16x70s. In fact, I've never had the luxury of dark skies, so haven't even bagged them all with any of the scopes.

It's kind of funny, cuz I was just considering getting another, more comprehensive 300 object compilation chart system. But, it occured to me that I've got a looong way to go before I even find all the stuff in the Messier and Caldwell lists.

tc2, don't get discouraged, though. Looking for them is most of the fun, anyway.

Mike Swaim

#5 Fiske

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Posted 26 April 2004 - 08:58 AM

Mike:

It's a shame you don't have access to a good dark sky site -- it adds a whole new dimension to observing. Don't get me wrong, I enjoy urban observing and do quite a bit of it but a trip to a dark sky site enables you to see tons of stuff never visible visually in light polluted skies no matter what equipment you use.


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