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Sry

After the the release of the new orbit for C/2012 E2 (SWAN) in MPEC 2012-F02 I
went back and reprocessed my images from March 10 and to my suprise found a
very slightly extended starlike object in correct position and correct
brightness. Here is a final stacked image consisting of 72 x 3.2 second
frames with the suspect circled (The circle is 15´ diameter for scale):

http://tinyurl.com/7ryxbme

This was a crop rescaled 2x from the original image made with a 350D + 135mm
f3.5 lens mounted on a tripod. Keep in mind the comet suspect was just 4
degrees from the horizon at nautical twilight (sun at -12 degrees alititude)
and was at just 17 degrees elongation. It required very agressive gradient
correction and is without doubt one the hardest observations I´ve had to make.

I also created 3 subframes of 24 frames each and the object is visible
consistently in each and measurements in astrometrica are as follows:

CK12E020 C2012 03 10.37527 00 30 43 -07 12 13    9.2 N E27
CK12E020 C2012 03 10.37632 00 30 44 -07 12 15    9.2 N E27
CK12E020 C2012 03 10.37736 00 30 44 -07 12 16    9.2 N E27

The measurement error is problably no better than +/- 15 arcsecs especially
given the low altitude.

Terry

After the the release of the new orbit for C/2012 E2 (SWAN) in MPEC 2012-F02 I went back and reprocessed my images from March 10 and to my suprise found a very slightly extended starlike object in correct position and correct brightness. Here is a final stacked image consisting of 72 x 3.2 second frames with the suspect circled (The circle is 15´ diameter for scale):

http://tinyurl.com/7ryxbme

This was a crop rescaled 2x from the original image made with a 350D + 135mm f3.5 lens mounted on a tripod. Keep in mind the comet suspect was just 4 degrees from the horizon at nautical twilight (sun at -12 degrees alititude) and was at just 17 degrees elongation. It required very agressive gradient correction and is without doubt one the hardest observations I´ve had to make.

I also created 3 subframes of 24 frames each and the object is visible consistently in each and measurements in astrometrica are as follows:

CK12E020 C2012 03 10.37527 00 30 43 -07 12 13    9.2 N E27
CK12E020 C2012 03 10.37632 00 30 44 -07 12 15    9.2 N E27
CK12E020 C2012 03 10.37736 00 30 44 -07 12 16    9.2 N E27

The measurement error is problably no better than +/- 15 arcsecs especially given the low altitude.

Terry

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A csatolmányként küldött képeket kérjük, méretezd át úgy, hogy a
hosszabbik oldaluk legfeljebb 800 pixeles legyen! Köszönjük!

Általános információk és tanácsok a képbeküldéssel kapcsolatban:

http://meteor.mcse.hu/digitalis_kepek.html
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