NGC 4236 - barred spiral galaxy
Equipment :
SkyWatcher EQ-6R Pro GoTo
Skywatcher Esprit 100/550 with SW Flattener
Guiding telescope:
Skywatcher  Evoguide 50/242
Guiding Camera:
ZWO ASI290MM mini
Image Details
NGC 4236
Exp. data :
30 x 600s
Image capture date  :
14. 03. 2020.
Observing Site
Nagybörzsöny - Hungary
E18°49'29" ; N47°55'57"
Short Description
Located just north of the Big Dipper, Caldwell 3 is one of at least 34 gravitationally bound galaxies in the Ursa Major galaxy group. This barred spiral galaxy, also known as NGC 4236, sits 11.7 million light-years from Earth in the constellation Draco and has an apparent magnitude of 9.6. Although faint, Caldwell 3 can be spotted using a small telescope from a dark-sky site. However, the best views are through large telescopes, which show the galaxy as a large, diffuse glow that’s brighter toward the center. It appears highest during the spring in the Northern Hemisphere. It can also be seen from northern latitudes of the Southern Hemisphere in autumn, albeit with a bit more difficulty as it will appear low in the sky. The galaxy was first spotted by British astronomer William Herschel in April 1793. Barred spiral galaxies are named for the elongated lane of stars that cut through their centers. Not only do these bars often make their galaxies easier to pick out in the night sky due to their needle-like structure, but they can also have profound effects on the dynamics of the galaxies. Bars are thought to direct gas from the spiral arms toward the center of the galaxy, fueling stellar birth. These structures seem to be common in spiral galaxies. Of those that we have observed, nearly two-thirds of spiral galaxies contain a bar, including our Milky Way.