Comet
PanSTARRS C/2021 S3

Object :	Comet, PanSTARRS C/2021 S3
Coordinates/Direction :	-
Object size :	-
Object magnitude :	8, at maximum
More to know :	You can read more about the comet on Seiichi Yoshida's homepage: http://www.aerith.net/ comet/ catalog/ 2021S3/ 2021S3.html

Comet's light curve:

Comet PanSTARRS C/2021 S3, light curve 2024

Credit: software 'Comet for Windows' from Seiichi Yoshida

The magnitude of the comet around the days I photographed it.

Comet PanSTARRS C/2021 S3, 2024-04-08:

(Click on image to get one in higher resolution, open in a new window)

Date :	2024-04-08
Time (UT) :	00:04 to 01:06

Mount :

SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)

Lens/telescope :	Pentax 645 300 mm ED f/4 (medium format lens)
Corrector/Barlow :	-
Field (FOV) :	6.8x4.5^o (full frame) before crop

camera :	Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature:	About 6^o C above surrounding temperature
Film/CCD :	Raw, Cr2
Filter :	none

Control system:

Mount, camera, focus, guide (Ekos) controlled by Astroberry (KStars/Ekos Linux)

Exp. time :	60x60 seconds, 1600iso, dithered every third, I could only use 37 of this photos
Image process tool :	Siril, Gimp, Irfanview
Processing :	synthetic bias, flat, photometric color calibration
Weather :	Partly clouds, +8 degrees Celsius

Site :

Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20^o to 90^o, 165^o to 185^o, Alt: 20^o to 55^o

Comment :

Last chance this spring to catch a comet. These nights there is a PanSTARRS comet outside my window. It's weak and only 25 degrees above the horizon. That make it very difficult to see it on the photo. I couldn't even align on the comet because it was so weak. Here is a plate solved version: PanSTARRS C/2021 S3, opens in a new window, by Astrometry.net. The nearby object IC 1307 is a group of stars: IC 1307.

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