[AZ-Observing] Re: Farewell image to comet Hartley 103P
- From: "Bernard Miller" <bgmiller011@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Sun, 13 Feb 2011 20:31:48 -0700
Chris,
Cool image. It took me awhile to find the comet. This must have been a lot
of work.
Bernard
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Chris Schur
Sent: Sunday, February 13, 2011 7:31 PM
To: Az-Observing List
Subject: [AZ-Observing] Farewell image to comet Hartley 103P
Hi all,
This CCD image is quite unlike any other image I have ever processed. As
you remember, comet Hartley was a bright object last year, providing a fine
show for both visual and photographic observers. Spacecraft images revealed
a stunning peanut shaped nucleus, and even city dwellers were able to
ferret this one out when at its brightest. But now, heading out to the far
reaches of the solar system, the comet is barely visible amongst the flurry
of bright colorful stars of the Monoceros Milkyway.
Since the comet moved considerably during the 2 hours I imaged it last
night, the method of combining CCD images taken with RGB filters separately
would have resulted in thousands of rainbow streaks across the field, with
the comet stationary in the center. To produce this image, with star
streaks the correct color, I layered 12 copies of the color image of all 12
frames with the stars stacked and in register over each individual bead in
the star trails. This when combined with lighten reproduces the trails
correctly for color. fortunately a bright star did not go right over the
comet image, and it remains intact in the center.
The final result you will see here produces a rich spray of spectacular star
colors whizzing by a tawny colored comet during a 2 hour interval.
Here is the Image:
http://www.schursastrophotography.com/newcomets/Hartley021211.html
Clear Skies,
Chris
Schur's Web Portal: http://www.schursastrophotography.com
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