| Object : | Comet, Atlas C/2017 M4 |
| Coordinates/Direction : | - |
| Object size : | - |
| Object magnitude : | - |
| More to know : |
You can read more about the comet at:
Seiichi Yoshida's homepage:
http://aerith.net/ comet/ catalog/ 2017M4/ 2017M4.html
NASA:
https://ssd.jpl. nasa.gov/ sbdb.cgi?orb=1; sstr= 2017+M4
Vanbuitenen:
http://astro.vanbuitenen.nl/ comet/ 2017M4 |
| Date : | 2018-04-19 |
| Time (UT) : | 23:48 to 01:04 |
| Mount : | Skywatcher EQ6 Pro |
| Guide : | PHD2and 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 : | 60x60 seconds at ISO800 |
| 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, noise filter. |
| Site : | Sweden, Stockholm, Hagsätra. Bortle class 9 |
| Comment : |
This comet was very weak, about magnitude 15.3 at the time when this photo was taken.
A half year later it had reached the magnitude 12, but then not possible to see from my balcony.
I have very high light pollution where I live so I was not sure if it will be possible to see the comet on the photo.
But it looks to be a weak trace of it when zooming in, see the image below.
The distance to the comet at this time was about 4 AU, (Astronomical Unit, four times the distance between Earth and Sun). |
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| Comment : |
This is a crop around the comet.
At this time when the photo was taken the comet was far away and weak, about magnitude 15.3.
The image is a 1:1 crop and then zoom x2 to let the comet be easier to see (but not for 100% sure the arrow point correct,
it should be a bit more to the left according the orbital table).
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English
(Place the cursor over the image to get info)