| 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 |
| Date : | 2019-03-06 |
| Time (UT) : | 19:54 to 21:27 |
| Mount : | Skywatcher EQ6 Pro controlled by EQMOD and APT |
| Guide : | PHD2 and QHY5 camera 400 mm f/6.3 lens |
| Lens/telescope : |
TS130 APO f/7, 3" field flattener |
| Field (FOV) : | 2.25x1.5 degree, before cropping |
| Filter : | none |
| Camera : |
Canon EOS 6D |
| 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. |
| Site : | Sweden, Stockholm, Hagsätra at balcony. Bortle class 9 |
| 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.
|
| 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 |
| Field (FOV) : | 2.25x1.5 degree, before cropping |
| 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. Bortle class 9 |
| 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.
|
| 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. |
| 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 |
English
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