is a face-on spiral galaxy distanced 21 million light-years (six megaparsecs) away from Earth in the constellation Ursa Major. M101 is a large galaxy, with a diameter of 170,000 light-years. By comparison, the Milky Way has a diameter of 100,000 light years. It has around a trillion stars, twice the number in the Milky Way. It has a disk mass on the order of 100 billion solar masses, along with a small central bulge of about 3 billion solar masses.
A good example showing how a coma mirror can break a nice picture. I’ve hope, that the coma corrector I will buy in the coming week, will eliminate the above mentioned optical defect in the entire camera frame.
- Photos taken at May 2020,
- Equipment: Canon EOS 6D, CT10 Newton 1200/250[mm], F4.8, NEQ6Pro.,
- Composition: Astro Pixel Processor,
- Processing: GIMP + plug-ins,
- Lights: 81 x 120[s], ISO 1600,
- Correction frames: Flats, DarkFlats, Darks, Bias
Over the last year of using my SynScan GOTO controller, I’ve noticed that the ESC button doesn’t always work as expected. Somehow I lived with it limitations. Last time the left Ra button, also began to fail and did not always connect. I could live with it for some time and it was, but lately it was even worse. After pressing the Ra button, this one did not always bounce up and the mount started to rotate like a carousel. After all, I have to mention that I had many trips together with my equipment and it is not a set that was used in the static way. A red light came on in my head – something needs to be done against trouble coming. There were not many options available, just two. First I am sending the controller to the service or second I will do something myself to fix those issues. My engineer nature took over (as always), I started to solve the problems myself.
Also known as Caldwell 14 or open clusters NGC 869 and NGC 884, ( often designated h Persei and χ Persei, respectively), which are close together in the constellation Perseus. Both visible with the naked eye, NGC 869 and NGC 884 lie at a distance of 7,500 light years.
There are more than 300 blue-white super-giant stars in each of the clusters. The clusters are also blueshifted, with NGC 869 approaching Earth at a speed of 39 km/s (24 mi/s) and NGC 884 approaching at a similar speed of 38 km/s (24 mi/s). Their hottest main sequence stars are of spectral type B0.
remember the first time, I saw both clusters in the eyepiece of my
old Newton 1000/200 [mm]. My eye stuck to the lens. I couldn’t take
my eyes off it.
Unfortunately, I did not capture both clusters as I would like, the coma corrector was not well matched as seen on the edge of the frame. It will be better next time. I promise 😉
Photos taken on August 2019 at Bieszczady with PTMA rally.
Canon EOS 6D, SkyWatcher Newton 1000/200 [mm], F5, coma corrector,
Astro Pixel Processor,
GIMP v2.10.14 + plug-ins (Linux),
24 x 96[s]
At first impression, the AutoStakkert user interface does not seem easy to use. However, after getting to know the key options and understanding how the program works, its interface not more to be a secret. We will go through the stacking procedure, processing sample of Moon light frames, which I collected in the early spring of this year.