M81 or Bode's galaxy is a large bright spiral galaxy located 11.8 million light-years from Earth in the constellation of Ursa Major. With an apparent magnitude of +6.9 it's easily visible with binoculars, a fine target for small telescope owners and a wonderful sight in larger scopes. The galaxy is a striking example of a grand design spiral; a galaxy that exhibits prominent near perfect and well defined spiral arms.

In the same binocular and low magnification telescope field of view as M81 is M82, another prominent galaxy. At mag. +8.4, M82 is fainter (and smaller) than M81 and a very different type of galaxy. It's a starburst galaxy in which stars are forming at exceptionally high rates. Also known as the "Cigar" galaxy, M82 is the prototype object of its type and provides a striking compliment to the near perfect spiral shape of M81. Together the pair forms a popular visual and imaging target for amateur astronomers.

Both M81 and M82 were discovered by Johann Elert Bode on December 31, 1774. Pierre Mechain then independently rediscovered both galaxies in August 1779. He reported his observations to Charles Messier who added them to his catalogue on February 9, 1781.

Finding M81 is not particularly difficult as the famous "Plough" asterism of Ursa Major can be used as the starting point. First focus on Dubhe (α UMa - mag. +1.8) the northwest corner star of the bowl of the Plough. The M81 / M82 pair is located 10 degrees northwest of this star with M82 positioned 38 arc minutes directly north of M81.

M81 spiral galaxy by the Hubble Space Telescope (NASA, ESA, and The Hubble Heritage Team (STScI/AURA))

Finder Chart for M81 (also shown M40, M97, M82, M108 and M109)

Finder Chart for M81 (also shown M40, M97, M82, M108 and M109) - pdf format

M81 appears a faint patch of light in 7x50 or 10x50 binoculars. There are rare reports that some eagle-eyed stargazers have managed, under exceptional conditions, to see M81 with the naked eye but this is sensational viewing by all accounts. It would mean M81 being by far the most distant permanent object that can be viewed without a telescope. However, M33 is commonly regarded as the holder of this record.

A small 80mm (3-inch) scope at low power reveals M81 as a bright oval haze without detail. Also visible and in the same field of view is M82, which appears as a slim grey needle of uniform light. A 150mm (6-inch) scope at high power reveals M81 as a huge low surface brightness halo of nebulosity surrounding a bright core. In larger scopes more subtle details can be seen. The small unbarred spiral galaxy NGC 2976 lies 1.5 degrees southwest of M81 and can be seen without detail through a 200mm telescope.

M81 has an apparent size of 27 x 14 arc minutes, which corresponds to a spatial diameter of 90,000 light-years. It's estimated to contain more than 250 billion stars and is the largest member of the Ursa Major or M81 group of galaxies that contains at least 34 members. M82 is also a member of this group, which is one of the closest groups of galaxies beyond our own Local Group. The galaxies are best seen from the Northern Hemisphere during the months of March, April and May. They are circumpolar and hence never set from locations north of 21 degrees north.

Only one supernova, SN 1993J, has been detected in M81. It was discovered by F. Garcia in Spain on March 28, 1993 and peaked at apparent magnitude +10.8, making it the brightest supernova in the northern part of the sky since 1954.

M81 Data Table

Messier81
NGC3031
NameBode's Galaxy
Object TypeSpiral galaxy
ClassificationSA(s)ab
ConstellationUrsa Major
Distance (kly)11,800
Apparent Mag.6.9
RA (J2000)09h 55m 33s
DEC (J2000)69d 03m 55s
Apparent Size (arc mins)26.9 x 14.1
Radius (light-years)45,000
Number of Stars>250 Billion
Notable FeatureLargest member of the M81 Group of galaxies

Sky Highlights - March 2017

Comet
Comet 41P/Tuttle-Giacobini-Kresak now visible with binoculars as it heads towards perihelion

Mercury
Mercury heading towards greatest elongation east

Minor Planet
Vesta now visible with binoculars and small telescopes.

The Planets
This Month's Guide

Algol Minima
Algol eclipse dates and times for March 2017

Northern Hemisphere
Evening
West:- Venus (mag. -4.8 to -4.1 - first half of month), Mars (mag. +1.3 to +1.5), Uranus (mag. +5.9), Mercury (mag. -1.5 to -0.4 - second half of month)
Midnight
Southeast:- Jupiter (mag. -2.3 to -2.5)
Morning
Southwest:- Jupiter
Southeast:- Saturn (mag. +0.5)

Southern Hemisphere
Evening
West:- Venus (first half of month), Mars, Uranus
Midnight
North:- Jupiter
East:- Saturn
Morning
West:- Jupiter
Northeast:- Saturn
East:- Neptune (mag. +8.0 - second half of month)

Deep Sky
Naked eye / binoculars:-
Melotte 111 - Mel 111 - The Coma Star Cluster (Open Cluster)
Messier 44 - M44 - The Praesepe (Open Cluster)

Telescopes:-
Messier 67 - M67 - Open Cluster
Messier 51 - M51 - The Whirlpool Galaxy (Spiral Galaxy)
Messier 97 - M97 - The Owl Nebula (Planetary Nebula)
Messier 101 - M101 - The Pinwheel Galaxy (Spiral Galaxy)
Messier 65 – M65 – Spiral Galaxy
Messier 66 - M66 - Intermediate Spiral Galaxy
Messier 95 - M95 - Barred Spiral Galaxy
Messier 96 - M96 - Intermediate Spiral Galaxy
NGC 4244 - Spiral Galaxy
NGC 4565 - Needle Galaxy - Spiral Galaxy

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