M81 and M82 Galaxies (Luís Ramalho)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: Bode's Galaxy · Cigar Galaxy · M 81 · M 82 · NGC 2959 · NGC 2961 · NGC 3031 · NGC 3034 · NGC 3077

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M81 and M82 Galaxies

Link: http://www.astrosurf.com/ramalho/galaxias/m081/m81_20160502.htm

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M81 and M82 Galaxies

Link: http://www.astrosurf.com/ramalho/galaxias/m081/m81_20160502.htm

M81 (NGC 3031) is one of the largest and most beautiful spiral galaxies in our sky. The image shows a bright, almost stellar core, and large spiral arms (Type Sb). It is 11.8 million light years away and is part of the Ursa Major galaxy cluster. The M81 was originally discovered by Johann Elert Bode on December 31, 1774 who described it as a "cloudiness" (Bode's nebula), along with the irregular galaxy M82 (bottom right). The actual diameter of the M81 is 36000 light years, has a luminosity equivalent to twenty billion suns and a total mass that approaches the 250 billion solar masses.

The bright galaxy M82 (NGC 3034) has an unusual structure. It is an intense source of radio emissions and has a powerful magnetic field. It presents a chaotic system of filaments (which can still be seen in the image) whose origin is in the center of the galaxy. The M82 has a diameter of about 16000 light years and its total mass is 50 billion solar masses.

The distance between the M81 and the M82 is only 100000 light years. Radio telescopes reveal that the two galaxies are connected by a huge cloud of intergalactic gas. Millions of years ago the M82 passed in the vicinity of the M81, with a mass far greater than its own, and its gravitational effect may have given rise, in part, to the extraordinary phenomenon that is observed today in the M82.

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Advanced success
Started	...
Astrometry.net job	4056695
PixInsight job	I2VKAVQNN7FFHM14QQV1WRM5H13G1GK8
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	09h55m31s.29
RA (top/left)	09h44m28s.74
RA (top/right)	10h06m33s.17
RA (bottom/right)	10h07m15s.98
RA (bottom/left)	09h43m47s.32

Dec (center)	+69°05′33″.7
Dec (top/left)	+68°23′47″.6
Dec (top/right)	+68°23′41″.4
Dec (bottom/right)	+69°44′29″.0
Dec (bottom/left)	+69°44′36″.8

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M81 and M82 Galaxies

M81 and M82 Galaxies

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M81 and M82 Galaxies

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