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Atlas C/2017 M4

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: comet/ catalog/ 2017M4/ 2017M4.html

https://ssd.jpl. sbdb.cgi?orb=1; sstr= 2017+M4

Vanbuitenen: comet/ 2017M4

Comet's light curve:

Comet Atlas C/2017 M4, light curve 2019 Credit: software 'Comet for Windows' from Seiichi Yoshida

The magnitude of the comet around the days I photographed it.

Comet Atlas C/2017 M4, 2018-04-19

Comet Atlas C/2017 M4, 2018
Date : 2018-04-19
Time (UT) : 23:48 to 01:04
Mount : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
Guide : QHY5 camera with 400 mm f/6.3 lens
Lens/telescope : TS130 APO f/7 910mm, 3" focuser
Corrector/Barlow : 3" field flatter, x1. T48 connector to camera
Field (FOV) : 2.25 x 1.5o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system : Mount by EQMOD, camera by APT, guide by PHD2, focuser by USB-focus, ASCOM Windows PC
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.
Site : Sweden, Stockholm, Tyresta Nature reservation, Spirudden. Bortle 4
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).

Comet Atlas C/2017 M4, 2018-04-19, crop around comet

Comet Atlas C/2017 M4 (Place the cursor over the image to get info)
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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