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Equipment Discussions / Re: Comet filter?
« Last post by Don Pensack on August 12, 2017, 01:13:37 PM »
Many inexpensive O-III filters also transmit the C2 lines, so make decent "comet" filters.
[You'd have to know the spectrum of transmission, and Lumicon will test a filter for free or provide you details
on a filter they've tested.]
And since these typically have much narrower bandwidths than many "CLS/Broadband" type filters, also yield more contrast.
Note that they only enhance the gas tail.  The dust tail is usually full spectrum and usually best without a filter.
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Equipment Discussions / Re: counterbalancing a truss dob?
« Last post by Don Pensack on August 12, 2017, 01:09:12 PM »
For looks, add two small finger-shaped pins to the bottom edge of the top side of the mirror box.
Buy a few dumbbell weights of 2.5 and 5 lbs.  Add the weights to the pins as needed.
If you only need one weight and not above 30° altitude, a bungee cord between the bottom edge of the top of the mirror box
and the rocker box below it will suffice as a "virtual" couterweight.  Just make sure the length of the bungee is the right length
that it doesn't start getting stretched until the scope is getting low.  As the cord stretches, the equivalent counterweight increases,
which is ideal.  If your eyepieces vary in weight a lot, a second hook and second bungee cord may be needed.
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TAC Imaging / NGC 6946 Fireworks Galaxy and SN 2017eaw
« Last post by jeffweiss9 on August 11, 2017, 02:24:30 PM »
This is an 11.7 hour HaLRGB of the Fireworks Galaxy and its most recent supernova, SN 2017eaw (in the upper arm at 1 o'clock).  Taken during three different nights at the Bear Gulch Users Area at Pinnacles N.P., East. Conditions were excellent the first night with SQM readings to 21.80 (21.90 for another imager) and quite good the other two nights.  Great place.

Link at http://www.astrobin.com/306884/.

Cheers,
Jeff
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Annual Star Parties / CalStar is 6 weeks away!
« Last post by CharlieWicks on August 07, 2017, 03:12:51 PM »
Greetings,

This is a reminder that CalStar is only 6 weeks away. There are still spaces left. Last year we sold out, so if you haven't registered and are planning to go, don't wait until the last minute.

Visit http://calstar.observers.org to register.

Clear Skies,

Charlie
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Observing Reports / Re: Globular Cluster hunting -- in Barnard's Galaxy!
« Last post by Marko on August 06, 2017, 04:05:58 PM »
No, did not even try for #1.  Of course I knew it existed due to how whole numbers dominate lists but because it does not show on MegaStar or I had not enough options on I did not go for #1.   I attach my finder chart used Oct 10, 2010 in very dark skies (you were not present but often were at this site).
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Observing Reports / Re: Globular Cluster hunting -- in Barnard's Galaxy!
« Last post by sgottlieb on August 06, 2017, 03:36:48 PM »
NGC 1049 = Fornax 3 is the brightest globular, then Fornax 4 and 5 a bit smaller and fainter.  Fornax 2 is the faintest of the main 4, which are all visible in a 10-inch or 12-inch.

I would be surprised if you could pick up Fornax 6 as I called it "extremely faint" in the 48-inch, but Uwe Glahn writes that he glimpsed it a 18" from Namibia.  My full description was "extremely faint, small, very low surface brightness spot, ~0.3' diameter.  Located 7' due north of globular Fornax 4.  Pinpointing the location, a mag 15.8 star is 1.6' W and a mag 16.5 star is 2.1' WNW."   But Fornax 6 isn't a globular anyways -- it's either a group of extremely faint stars (~21st mag) or even distant galaxies!

There is a 5th globular, though -- Fornax 1, which is much fainter than the other 4 (perhaps close to 16th mag).  Perhaps this is the one you looked for?
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Observing Reports / Re: Globular Cluster hunting -- in Barnard's Galaxy!
« Last post by Marko on August 05, 2017, 10:54:00 PM »
What is your count for Fornex Globs?   I seem to have 2,3,4,5  but called out 6 as 'iffy' and decided I would not count it but spent 20 minutes before saying 'no claim'.

I cannot say I recall noting any globs in M33 and this after a great deal of time was spent on assorted objects within it (mostly suggested by yourself I think, thanks).  is it too far away for globs?
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Observing Reports / Re: Globular Cluster hunting -- in Barnard's Galaxy!
« Last post by sgottlieb on August 05, 2017, 09:49:00 PM »
For next fall, I was just approved for an observing article in Sky & Tel on Local Group globular clusters, so I certainly hope to get a look at SC 6!
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Observing Intents / Eclipse 2017: Kentucky
« Last post by Jeffcrilly on August 05, 2017, 07:22:32 PM »
Ok.. Fyi.. I'm going to KY for the eclipse.
Sounds risky from a weather perspective, but I know some people in the area so it seemed like a logical choice.
Just picked up some glasses from Lunt via Amazon.  (Next day delivery!)  And some Lunt Solar 8x32 binos.
(The solar (white light) binos are actually kinda nice.)
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Observing Reports / Re: The Pinnacle of Dark Skies
« Last post by Mark on August 05, 2017, 10:41:09 AM »
Hey Brad - stumbled across the picture today.  Surprise!  What year was it?
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