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Topics - Davids

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TAC Imaging / Lunar imaging question
« on: April 26, 2017, 02:22:39 PM »
Hi All,

I picked up an ASI130MM camera recently to use for the eclipse in August.  I figured I might as well practice on the moon also.  My question regards exposure time vs. gain and how to avoid washing out the brightest features.  I got this shot that turned out ok, but Copernicus and Aristarchus are over exposed and the other images I have during the same session that aren't just don't have the same detail (I know it could be seeing). 

I'm using a C8 (note to self, get a Crayford focuser), AutoStakkert for Stacking, and Registax 6 for wavelet processing.

Any suggestions are very welcome.

Cheers,

Dave

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Observing Reports / The Sun this afternoon 8/27
« on: August 27, 2014, 01:48:46 PM »
Spent an enjoyable hour observing the Sun this afternoon.  Lots of detail on the surface, the filaments looked like someone with a bunch of badly healed scars.  In my scope 3 spots formed a right triangle in the center with the hypotenuse to the right...all of that to say where the prominences that I saw were located.  There was a nice little grouping of them between 3 and 4 o'clock, based on my orientation.  I think that would make it the east limb, but I'm not sure.

I set up at work with my AT-80/Lunt LS50Ha piggybacked on my C8 out in the parking lot.  It's fun because I get to share views with a bunch of my coworkers as they head to and from lunch.

Cheers,

Dave

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Observing Intents / OI: Lake Sonoma Saturday 8/23
« on: August 19, 2014, 08:20:13 AM »
I plan to be at Lone Rock somewhere between 7:30 and 8pm. 

Hope to see others there.

Cheers,

Dave

4
Observing Reports / OR: Lake Sonoma 8/16/14
« on: August 18, 2014, 05:45:53 PM »
Matt Marcus' OI posting was enough to prompt a last minute decision to head up to the lake on Saturday.  For me, Lake Sonoma's Lone Rock Flat is about a 35 minute drive so last minute decisions work well.

As Matt had pointed out, it was a short night with the moon rising around midnight, but it was worth it.  We had a good 2 1/2 hrs of darkness to work with.  I had no plan, but that's ok, summer lends itself to that...

At sunset we checked out Saturn and the seeing was good, even with Saturn getting pretty low.  Cassini was crisp and the cloud bands were clear, I was able to pick out 5 moons, the rest were no shows probably due to only average transparency.

I'm still getting used to setting up and collimating a dob and that was obvious later in the evening when we looked at Epsilon Lyrae as the Double-Double looked like a pair of seagulls.  A quick (or maybe not so quick) tweak of collimation had that fixed and showed a nice clean split at 260x.  Up until this winter all of my observing was with a C8, I'm certainly enjoying the extra aperture that the my Lightbridge 16 provides.

Since I didn't have an observing plan I just spent the evening revisiting eyecandy to see old friends anew.  A couple of the highlights for me were the Veil with an OIII filter (spent a lot of time on that)  and NGC 7331 in Pegasus.  I've seen 7331 many times in my C8, but have never managed to see any of the companions, this time I was able to see 3 of the 4 (7340, 7335, 7337).  The moon was coming up right about then and things soon washed out and that's when I called it a night and packed up.

Although it was a short night it was fun with great seeing and so-so transparency.  The weather was great with no wind and mild temperatures.  It did start to get a bit dewey around midnight, but moon came up and shut things down then anyway, so it was never a problem.

Hoping to get back up there next weekend for new moon.

Cheers,

Dave

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