(372) Palma is approaching M-31. It wont actually transit for another day or so but I got a few shots of its approach tonight. Animated GIF of 3 images taken over one hour. FOV is about 18x26 arc min. North is up, east to the left. http://users.wirelessbeehive.com/~paw/temp/PALMA-2011OCT18.GIF Hopefully it will be clear again the next few nights so I can get images of the transit. Cheers, patrick
Great shot patrick! It looks like there is some other movement in the shot. Any idea on what it was? Josh
Hi Josh, On 18 Oct 2011, at 01:28, Josh wrote:
Great shot patrick!
Thanks.
It looks like there is some other movement in the shot. Any idea on what it was?
If you're looking at the same things I am they are called hot pixels. Basically defects in the image. I run my images through a program that removes most of them but it usually leaves a few behind. (BTW, in the days of film astrophotography we called things like that "Kodak stars" <g>). The way to tell the difference between hot pixels and something real is the real objects will move evenly in a straight line though all of the images. Hot pixels tend to not be in all the images and tend to bounce around. Cheers, patrick p.s. Very nice night tonight.
makes sense. My inexperience led me to think that they were just moving too quickly to be caught in successive shots. Now that I've had your explanation and thought more about it I suppose that if that was the case they would be lines instead of points. Glad to hear that you've had a good night. Josh On Tue, Oct 18, 2011 at 1:41 AM, Patrick Wiggins <paw@wirelessbeehive.com> wrote:
Hi Josh,
On 18 Oct 2011, at 01:28, Josh wrote:
Great shot patrick!
Thanks.
It looks like there is some other movement in the shot. Any idea on what it was?
If you're looking at the same things I am they are called hot pixels. Basically defects in the image. I run my images through a program that removes most of them but it usually leaves a few behind. (BTW, in the days of film astrophotography we called things like that "Kodak stars" <g>).
The way to tell the difference between hot pixels and something real is the real objects will move evenly in a straight line though all of the images. Hot pixels tend to not be in all the images and tend to bounce around.
Cheers,
patrick
p.s. Very nice night tonight. _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php
Cool! ________________________________ From: Patrick Wiggins <paw@wirelessbeehive.com> To: utah astronomy utah astronomy listserve <utah-astronomy@mailman.xmission.com> Sent: Tuesday, October 18, 2011 1:23 AM Subject: [Utah-astronomy] (372) Palma on approach to M-31 (372) Palma is approaching M-31. It wont actually transit for another day or so but I got a few shots of its approach tonight. Animated GIF of 3 images taken over one hour. FOV is about 18x26 arc min. North is up, east to the left. http://users.wirelessbeehive.com/~paw/temp/PALMA-2011OCT18.GIF Hopefully it will be clear again the next few nights so I can get images of the transit. Cheers, patrick _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php
Thanks Joe, Someone on another list noted I caught variable star GT And (period just over half a day). Located half way down the images about 1/8 of the way in from the right side. It's pretty obvious once you know where it is. Nice wx forecast so hopefully more images tonight. patrick On 18 Oct 2011, at 10:47, Joe Bauman wrote:
Cool!
________________________________ From: Patrick Wiggins <paw@wirelessbeehive.com> To: utah astronomy utah astronomy listserve <utah-astronomy@mailman.xmission.com> Sent: Tuesday, October 18, 2011 1:23 AM Subject: [Utah-astronomy] (372) Palma on approach to M-31
(372) Palma is approaching M-31. It wont actually transit for another day or so but I got a few shots of its approach tonight. Animated GIF of 3 images taken over one hour. FOV is about 18x26 arc min. North is up, east to the left.
http://users.wirelessbeehive.com/~paw/temp/PALMA-2011OCT18.GIF
Hopefully it will be clear again the next few nights so I can get images of the transit.
Cheers,
patrick
participants (3)
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Joe Bauman -
Josh -
Patrick Wiggins