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Comet PanSTARRS C/2011 L4

Object :	Comet, PanSTARRS C/2011 L4
Coordinates/Direction :	-
Object size :	-
Object magnitude :	-
More to know :	You can read more about the comet on Seiichi Yoshida's homepage: http://www.aerith.net/ comet/ catalog/ 2011L4/ 2011L4.html

Panstarrs C/2011 L4, 2013-04-06

Date :	2013-04-06
Time (UT) :	01:16 to 01:48

Exp. time :	25x60 seconds at ISO1000, at f/6.3
Image process tool :	Fitswork, Irfanview
Processing :	align, resize, level, cal dark and gamma image processing

Comment :

Taken from my balcony, this comet was great, I took several photos of it. I just wish I had taken it from a darker place.

Panstarrs C/2011 L4, 2013-04-06, eleven years later (Click on the image and get a full resolution image in a new window)

Date :	2013-04-06
Image process tool :	Siril, Gimp, Irfanview
Processing :	synthetic bias and flats
Site :	Sweden, Stockholm, Hagsätra. Bortle Class 9
Comment :	11 years later I processed the image once again, now with more modern tools. Siril for pre processing and Gimp for fine tuning. I didn't have correct flats for f/6.3 and made a special one of the f/4.5 flat I had, also the bias is replaced wit a constant, =127 which is correct for this 12-bit camera. I have suppressed the stars a bit to get better focus on the comet. The colors were problematic and I chose to convert it to monochrome. Better ? Maybe the tail is more details in now, but what I did with the old tools that's much less advanced wasn't a bad job.

PanSTARRS C/2011 L4, 2013-04-05

Date :	2013-04-05
Time (UT) :	23:43 to 00:08

Exp. time :	20x60 seconds at ISO1000, at f/5.6
Image process tool :	Siril, Gimp, Fitswork, Irfanview
Processing :	Dark and flat calibrated

Comment :

A test how to get something from the other photos I took with more modern software. One problem with this camera was to handle the red channel. I'm not sure why, what's different with this old camera is that it only had 12-bit resolution. A guess can be that it's not linear.

PanSTARRS C/2011 L4, 2013-04-06

Date :	2013-04-06
Time (UT) :	00:27 to 00:59

Exp. time :	25x60 seconds at ISO1000, at f/5.6
Image process tool :	Siril, Gimp, Fitswork, Irfanview
Processing :	Dark and flat calibrated

Comment :

I took a lot of photos this night but had to throw away them because of all clouds.

PanSTARRS C/2011 L4, 2013-04-06

Date :	2013-04-06
Time (UT) :	01:16 to 01:48

Exp. time :	25x60 seconds at ISO1000, at f/6.3
Image process tool :	Siril, Gimp, Fitswork, Irfanview
Processing :	Dark and flat calibrated

Comment :

A test how to get something from the other photos I took with more modern software.

PanSTARRS C/2011 L4 and Andromeda Galaxy, 2013-04-06

Date :	2013-04-06
Time (UT) :	01:58 to 02:27

Exp. time :	22x60 seconds at ISO1000, at f/6.3
Image process tool :	Siril, Gimp, Fitswork, Irfanview
Processing :	Dark and flat calibrated

Comment :

During the night the comet pass by close to the Andromeda galaxy. It had been much better if I had let the aperture to be fully open at f/4.5, softer but more photons collected.

PanSTARRS C/2011 L4, 2013-04-20

Date :	2013-04-20
Time (UT) :	23:42 to 23:55

Exp. time :	5x60 seconds at ISO1000, at f/5.6
Image process tool :	Siril, Gimp, Fitswork, Irfanview
Processing :	Dark and flat calibrated

Comment :

Last night I got a photo of the comet. Now it fade away quickly.

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