ccd-newastro at Yahoo! Groups

Re: NGC3718 an d NGC3729

Ron Brant — Tue, 21 May 2013 03:50:15 GMT

Nice detail Bernard! Ron ... From: Bernard Miller To: ccd-newastro@yahoogroups.com Sent: Monday, May 20, 2013 7:50 PM Subject: [ccd-newastro] NGC3718 an d

NGC3718 an d NGC3729

Bernard Miller — Tue, 21 May 2013 03:31:30 GMT

Hi, Here is an image of NGC3718 and its companion NGC3729. These two galaxies orbit each other with a separation of about 147,000 light years. These two

Re: M51 - Whirlpool Galaxy

Bob Franke — Fri, 17 May 2013 18:20:24 GMT

Using six SDSS-DR7 stars, eXcalibrator gives an RGB correction of 1.00, 0.99 and 1.07. This adjustment sets the area, that Stan mentioned, very close to a

Re: M51 - Whirlpool Galaxy

Stan — Fri, 17 May 2013 14:53:35 GMT

... You don't have to rely on appearance to determine color hues. Measure the color ADU differentials. A CCDStack measurement of an area near the satellite

Re: M51 - Whirlpool Galaxy

Bernard Miller — Thu, 16 May 2013 15:27:45 GMT

Jeff, Very nice detail. On my monitor it looks like there is a green tint to the image. You may want to try the HLVG filter.

M51 - Whirlpool Galaxy

Jeff Armstrong — Wed, 15 May 2013 21:54:16 GMT

The Whirlpool Galaxy (also known as Messier 51a, M51a, or NGC 5194) is an interacting grand-design spiral galaxy in the constellation Canes Venatici. The

Re: Gloves for handling filters

jfmiller7@... — Wed, 15 May 2013 16:14:28 GMT

I have had very good luck with the nitrile . Readily evadable . best regards, Jim Miller ... From: " nakbrooks " < ukzxcvb @yahoo.co. uk > To:

Re: Gloves for handling filters

nakbrooks — Wed, 15 May 2013 08:49:50 GMT

Thanks Ron, I'll go with Nitrile. Nigel

Re: Gloves for handling filters

Ron Wodaski — Tue, 14 May 2013 18:45:08 GMT

Latex is a safe bet, so is nitrile. I like the thicker ones they sell at automotive stores; they are less likely to break, and come in a wide variety of sizes.

Gloves for handling filters

nakbrooks — Tue, 14 May 2013 18:15:53 GMT

Bit of basic advice sought here. I've just bought a set of Astrodon narrow-band 50mm sq unmounted filters (haven't paid as much for anything so small since the

Re: Photoshop to be only in Cloud

Pete Su — Tue, 14 May 2013 15:49:34 GMT

... Neat. I did not know. I'll have to play with that. Thanks. Pete

Re: Photoshop to be only in Cloud

Stan — Tue, 14 May 2013 15:24:57 GMT

... CCDStack can be used for layering actions, though it does not display a running result (you must press the "combine" button or menu item to enact the

Re: NGC4490 and a question

Ron Wodaski — Tue, 14 May 2013 14:07:45 GMT

Almost certainly that's a reflection. Could be a bright star just outside the frame, or off-axis light source such as a porch light or an LED near the camera,

Re: NGC4490 and a question

Pete Su — Tue, 14 May 2013 14:03:54 GMT

It occurs to me now that the thing is too in focus to be that far away from the camera, I think. But I generally leave the camera attached to the tube, so it

NGC4490 and a question

Pete Su — Tue, 14 May 2013 14:02:51 GMT

Here's a shot of NGC4490 (the Cocoon, and Arp 269) that's been cropped. This is one taken with my usual MO of too little exposure from my back yard ? but