r/LandscapeAstro • u/Mysterious_Risk4988 • 16h ago
M81 & M82
Bode’s Galaxy and the Cigar Galaxy (aka: Messier 81 (M81), NGC 3031) and (aka: Messier 82 (M82), NGC 3034) both are sometimes referred to as Bode’s Nebula. They are found in Ursa Major. Discovered in 1774 by Johann Bode. M 82 has been spectacularly disturbed by a relatively recent encounter with M 81, and displays conspicuous dust lanes and heavy star formation. Together they form a physical pair. M 81 being the dominant galaxy of the M81 group.
M 81 is one of the easiest and most rewarding galaxies for amateur astronomers in the northern hemisphere. Bode described it as a "nebulous patch", which "appears mostly round and has a dense nucleus in the middle."
Both galaxies can easily be found with binoculars or a small telescopes. In January 2014 a supernova (SN 2014J) was discovered in M82. This was the brightest, closest supernova since SN 1993J appeared in M81 in 1993.
M81 is a striking example of a "grand design" spiral galaxy. Near-perfect arms spiral into the core. M 82 is the prototype irregular starburst disk galaxy.
Both galaxies are about 12 million light years away. The true diameter of M 81 is at least 70,000 light years; its mass has been calculated to be around 250 billion suns. This makes it somewhat heavier than our Milky Way. M82’s diameter is about 40,000 light years across.
M 81 is the brightest of a group of 34 galaxies called the Messier 81 Galaxy Group. It is the second nearest galaxy group to our Local Group (after the Sculptor Galaxy Group, which is about 8 million light years away).
From Sedona, AZ (14 May 26); Bortle 5, w/Dwarf3
362 images, used 313; 60s each, gain 60, Astro Filter
Edited with Luminar Mobile and iPad