September Calendar by Dave Mitsky All times, unless otherwise noted, are UT (subtract four hours and, when appropriate, one calendar day for EDT) 9/1 The Moon...
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starrynights@yahoogro...
Sep 1, 2010 12:30 pm
Welcome to Starrynights! Jump right in and post any observing related topics, questions, observations any time! We have lots of resources available on the...
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starrynights@yahoogro...
Sep 1, 2010 12:30 pm
Starrynights Policy Statement As a reminder of this group's desire to encourage all of its members to participate in a friendly and informed manner, please...
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suitti
Sep 1, 2010 2:58 pm
... I always use the night before. Consistency also removes ambiguity. I log observations on a computer, and use YYYYMMDD in the file name so that they sort...
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davejm28
Sep 1, 2010 6:42 pm
September Calendar by Dave Mitsky All times, unless otherwise noted, are UT (subtract four hours and, when appropriate, one calendar day for EDT) 9/1 The...
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Martin
matersmartin
Sep 2, 2010 12:36 pm
All, Some of you may already know a previous version of DVI. See here for the latest release: www.mmastro.nl/dvi.html For folks unfamiliar with DVI. It is an...
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askinsjohn@...
askinsjohn...
Sep 3, 2010 2:50 pm
Hi to everyone, I posted a question on Yahoo regarding something I saw last night. There is a strange halo around Sheliak which I cannot find in any other...
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Greg Crinklaw
theskyhound
Sep 3, 2010 3:18 pm
Hi John, This looks to me to be an optical aberration. When your optical system is in perfect alignment most of the light from the star is concentrated in the...
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askinsjohn@...
askinsjohn...
Sep 3, 2010 3:49 pm
Hi Greg, Thanks for the reply but in defence I have to say that the image was taken through an apochromatic refractor and so collimation is not an issue. On...
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Greg Crinklaw
theskyhound
Sep 3, 2010 4:43 pm
Hi John, Although it can't be discounted completely it is highly unlikely that this is something real in the sky. On the other hand, optical aberrations are...
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Geoff Gaherty
gahertyg
Sep 3, 2010 5:03 pm
... I'm inclined to agree with Greg here. To my eye this looks like the halo you get when dew begins to form on the objective. The acid test would be to...
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askinsjohn@...
askinsjohn...
Sep 3, 2010 6:19 pm
Hello again Greg, No need to be sorry, the image caught my attention and I'll be happy whatever it turns out to be. I was very surprised to see something there...
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askinsjohn@...
askinsjohn...
Sep 4, 2010 12:24 pm
Well, the skies here were excellent last night so I went straight to Sheliak. There can be absolutely no doubt that there is something around it. I've uploaded...
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Geoff Gaherty
gahertyg
Sep 4, 2010 12:45 pm
... Take a close look at the star at the left edge of the frame you sent me. With a tiny decrease of gamma, I can see a faint hint of a similar halo around it....
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Martin
matersmartin
Sep 4, 2010 1:31 pm
Hi John, I'm not an expert, but your first image was much more convincing than the 2nd. From your first I thought, indeed there is something strange going on...
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askinsjohn@...
askinsjohn...
Sep 4, 2010 2:19 pm
Hello Martin, I'm no expert at imaging, I'm very much a novice. The first image was with Sheliak well away from the centre of the fov, whereas the second image...
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Greg Crinklaw
theskyhound
Sep 4, 2010 4:40 pm
... Actually, your image proves beyond a doubt that is is an aberration. Why? Because the shape of the object changed overnight, which is impossible for a...
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Shane LaPierre
ctastronomer
Sep 4, 2010 5:08 pm
I think I would be concerned about finding the source and ridding my optical train of it so I could take better images! Have fun. It's the challenges and...
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askinsjohn@...
askinsjohn...
Sep 4, 2010 10:41 pm
Okay, I've tried some rudimentary processing on one of the images. I know it's far from perfect and it is a large picture with a wide field of view. Sheliak is...
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Shane LaPierre
ctastronomer
Sep 4, 2010 10:58 pm
Well if it turns out to be something, let me be the first to congratulate you! You need to find someone else to image this. Shane ... [Non-text portions of...
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amthornett
Sep 4, 2010 11:04 pm
Observing Notes 3-4/9/2010 Damian and I experienced one of our best ever observing sessions on Friday night 3-4/9/2010. We were joined by Rhys (age 7) until...
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Jim
jim_rapideye
Sep 5, 2010 12:01 am
On Sat, Sep 4, 2010 at 10:54 AM, askinsjohn@... ... They have - here is a couple of links to the DSS (Sloan Digital Sky Survey) images of Sheliak: ...
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askinsjohn@...
askinsjohn...
Sep 5, 2010 11:55 am
Hello and thank you to everybody who has provided input on this, especially Geoff and Greg. I have absolutely no reason to doubt Greg's explanation and...
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Eric Jamison
ej1847
Sep 7, 2010 12:52 am
I woke up early before dawn and looking out the back window noted it was clear. Winter constellations including Orion and Gemini were rising in the east as was...
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Thornett Andrew (5M3)...
amthornett
Sep 7, 2010 3:57 pm
I am interested that you see blue colour in M42 - with a 16" Lightbridge Dobsonian I see green - do you see any green colour? Do other folks see green or blue?...
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Eric Jamison
ej1847
Sep 7, 2010 8:01 pm
Hi Andy, ... There can be a number of factors that can influence color perception. I am by no means an expert on why some people see color and others do not....
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dennis_persyk
Sep 11, 2010 5:02 pm
Comet 103P Hartley 2 in Andromeda is currently at magnitude ~ 9.5. My images and Seiichi Yoshida's latest light curve data are here ...
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Greg Crinklaw
theskyhound
Sep 11, 2010 5:12 pm
Hi, I sure hope people aren't going to be disappointed by this one. Look at the light curve: it does not accurately reflect the bulk of the data. My own...
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dennis_persyk
Sep 11, 2010 6:02 pm
Hi Greg, Where is your data? I went to your website http://www.skyhound.com/ but didn't see it. Similarly, at http://cometchasing.skyhound.com/ you say " It...
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Greg Crinklaw
theskyhound
Sep 11, 2010 8:25 pm
Hi Dennis, I don't have data of my own. Nobody does. We all use the same observations made by the amateurs who do that sort of thing. What I said was that...
