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Comet
123P/West-Hartley


Comet: 123P/West-Hartley, January 18, 2019
Object : Comet 123P/West-Hartley
Date : 2019-01-18
Time (UT) : 22:37 to 23:25
Mount : Skywatcher EQ6 Pro
Guide : PHD2, Guide telescope 400 mm f/6.3, camera QHY5
Lens/telescope : TS130 APO f/7, 3" field flattener
Filter : none
Camera : Canon EOS 6D
Exp. time : 40x30 seconds at ISO1600
Image process tool : AstroImageJ with my own macros, Fitswork, IrfanView.
Processing : demosaic, one point aligned at center star, flat cal, no dark or bias, use dithering instead, median stack.
Site : Sweden, Stockholm, Hagsätra at balcony, lot of light pollution
Comment : This comet wasn't easy to catch, weak, strong light pollution and low to the horizon.
Magnitude 12.9 according to CdC (Skychart).
A 800 x 600 1:1 crop from full frame sensor, just outside the inner red circle below.
I must say that I'm surprised that it was possibly to catch this weak comet from my light polluted balcony.
More to know : You can read more about the comet on Seiichi Yoshida's homepage:
http://www.aerith.net/ comet/ catalog/ 0123P/ 2019.html

Sky simulation with CdC (Skychart):

Comet: 123P/West-Hartley, January 18, 2019
Object : Comet 123P/West-Hartley
Date : 2019-01-18
Time (UT) : 22:37 (23:37 CET)
Comment : With the CdC (Skychart) software you can simulate and see where you find the comets.
The inner red circle is 0.5 degree diameter, the outer is 2 degrees. The rectangle is the field with a fullframe sensor at focal length of 910 mm, about 2.2 x 1.5 degrees.
More to know : CdC (Skychart) homepage:
https://sourceforge.net/ projects/ skychart/

Nearby star magnitudes:

Comet: 123P/West-Hartley, star magnitudes, January 18, 2019
Object : Comet 123P/West-Hartley
Date : 2019-01-18
Time (UT) : 22:37
Comment : My friend Hans has provided the nearby star magnitudes as a comparison to the comet. Source APASS. Based on this, Hans estimates that the comet's magnitude is about 13.

Thanks a lot Hans for the correction of my mistakes earlier!
More to know : AAVSO homepage with APASS:
https://www.aavso.org/ apass

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