| Object : | Comet, Atlas C/2017 M4 |
| Coordinates/Direction : | Northern Sky |
| Object size : | - km |
| Orbital period : | - years |
| Perihelion : | 3.2 AU, shortest distance to Sun |
| Apparent magnitude : | ~12, peak, in Hercules, May, 2017 |
| Mass : | - kg |
| Discovered by : | Asteroid Terrestrial-impact Last Alert System, June 2017 |
| More to know : |
More info at Seiichi Yoshida's homepage:
http://aerith.net/ comet/ catalog/ 2017M4/ 2017M4.html
Vanbuitenen:
http://astro.vanbuitenen.nl/ comet/ 2017M4 |
| Exp. time : | 60x60 seconds at ISO800, 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, noise filter. |
| 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
Credit: software 'Comet for Windows' from Seiichi Yoshida
(Place the cursor over the image to get info)