My first serious robotic telescope attempt was to capture the fading SN 2017eaw. I've already photographed this celestial body, so I got the pleasure of capturing it with a professional equipment.
A little reminder of my photograph of August 2017: "Let's start: SN 1917A, SN 1939C, SN 1948B, SN 1968D, SN 1969P, SN 1980K, SN 2002hh, SN 2004et, SN 2008S and SN 2017eaw. Long, almost endless listing. Each of them is the name of a supernova, which was detected in the galaxy NGC 6946 in the past 100 years. The galaxy (with an apparent magnitude of 9.6) is located at the edge of the Cepheus and Cygnus constellations. The galaxy received its name ("Fireworks”) from the frequent supernova-explosions.
The supernova SN 2017eaw was detected on May 14, 2017 in the Fireworks Galaxy (NGC 6946), 22 million light-years away. At its discovery, its apparent magnitude was 12.8; at the time when the photograph was taken, this value was around 13.1. This means that it has barely faded over three months."
During my robotic session, it already faded around 15.0, but the supernova was still well identified. In spite of the relatively low exposure time, a spectacular photo was made with the new Mexican T21 telescope. It was also my first astrophoto, where I had to process color-filtered images and "luminance" images.
With the post-processing of the galaxy, as well as the August capturing, I was in trouble with the correct adjustment of the sharpness, as the light of the galaxy comes from behind a cosmic cloud of dust, thus producing "filtered" photons in color and sharpness that make this beautiful spiral galaxy even more special.
Fireworks Galaxy, NGC 6946, C12, SN 2017eaw
R.A. 20 h 34 m 52 s Dec. +60° 09′ 13″
Barred spiral galaxy - SBc
22.5 ± 7.8 million light-years
11' 30" x 09' 48"
Spring, summer, autumn
Total exposure time:
iTelescope - T21, New Mexico, USA
Corrected Dall-Kirkham Astrograph 431/1940 mm
Planewave Ascension 200HR
Focal ratio, length:
f/4.5, 1280 mm
3 x 180 s Red, 3 x 180 s Green, 3 x 180 s Blue, 3 x 180 s Lum
PixInsight, Adobe Lightroom, Adobe Photoshop