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Comet 123P/West-Hartley

Object :	Comet, 123P/West-Hartley
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/ 0123P/ 2019.html

Comet's light curve: Credit: software 'Comet for Windows' from Seiichi Yoshida The magnitude of the comet around the days I photographed it.

Comet 123P / West-Hartley 2019-03-06: (Place the cursor over the image to get info)

Date :	2019-03-06
Time (UT) :	19:54 to 21:27

Exp. time :	51x60 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.

Comment :

Another night with clear sky and I still have the comet outside my balcony. Magnitude is now 12.9 according to CdC (Skychart). A 800 x 800 1:1 crop from full frame sensor. It's moving faster now because it's closer to the Earth, you see how elongated it is because of its speed.

Comet 123P / West-Haertley 2019-01-18:

Date :	2019-01-18
Time (UT) :	22:37 to 23:25

Exp. time :	40x30 seconds at ISO1600, dithering mode
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.

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.

Sky simulation with CdC (Skychart):

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.

Nearby star magnitudes:

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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