[AZ-Observing] Re: Comet Animation
- From: "Jon Christensen" <jonc97@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Mon, 4 Jul 2005 18:03:53 -0700
The chip in my camera is an interline NABG chip and it is my understanding
that it is not designed to be used for science. Having said that, I ran a
program called CCD sharp which allows you to analyze the 'stellar profile'
of an object in the picture of your choosing. I did that with the comet on
many of the frames and here is the result it gave me:
Time Max pixel value
10:45 4365
10:47 5116
10:48 6157
10:49 6007
10:51 4623
10:52 4806
10:53 6780
10:55 7241
10:56 5435
10:57 5829
10:59 7224
11:00 8291
11:01 6580
11:05 8155
11:10 8144
11:16 7907
11:17 8796
11:18 11620
11:20 11083
11:21 10070
11:22 9258
11:24 11313
11:25 12314
11:26 12723
11:32 12175
11:37 9839
11:42 9197
11:48 10410
11:53 9325
11:58 7846
12:04 9215
I don't know how scientific this analysis is but the brightest pixels were
limited to a very small area of the comet and I couldn't tell the difference
visually from image to image.
One last thing, note the sizes of the stars between the two frames of the
Kitt peak animation. Not only does the comet nucleus get bigger, but the
stars around it get bigger as well, which makes me a bit skeptical about
whether the animation truly shows what was happening visually with the
comet.
Jon
----- Original Message -----
From: "Frank Kraljic" <FJKraljic@xxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Monday, July 04, 2005 2:42 PM
Subject: [AZ-Observing] Re: Comet Animation
>
> Jon,
>
> Here is a similar animation produced by Kitt Peak with a changing before
> and
> after animation.
>
> http://www.noao.edu/news/deep-impact/
>
> Also, I wouldn't let the sky brightening get in the way of noting even a
> marginal increase in brightness. As with Skiff's party, you even noted an
> increase in peak-pixel count shortly after impact. Perhaps you could
> coordinate your data with the visiting students at Lowell.
>
> -FRANK
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