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
M101 (NGC 5457) – Pinwheel Galaxy – a spiral galaxy with a weak nucleus and very well developed arms in the constellation Ursa Major. Brightness is 7.9 Magnitude.
The diameter of M101 is 170 000 light years, and its mass is approximately equal to 180 billion solar masses. It’s 21 million light years away.
Four supernovae have been observed in this galaxy so far: SN 1909A, SN 1951H, SN 1970G and SN 2011fe.
Together with other weaker galaxies, M101 forms a group of M101 galaxies. The influence of nearby galaxies disturbed the shape of M101 and caused gas clouds to stretch. The close pass neighbor galaxy (most likely NGC 5474), near M101 about 250 million years ago also enforced to increase in star-forming activity. The northeastern galaxy arm contains more young blue stars.
In Poland, visible whole year.
(March 2019) taken in Zwardoń. A standard place for PTMA Katowice
Equipment: Canon EOS 6D, Sky-Watcher 200/1000 [mm] on
Composition: APP (3 best frames + Flat +
Processing: GIMP v2.10.14 + add-ons (Linux)
x 237 [s], ISO-1000;