Bode’s Galaxy M81: The Bright Spiral in Ursa Major

If someone asked me to name the most underrated galaxy in the northern sky, I’d say Bode’s Galaxy without hesitation. Officially catalogued as Messier 81 (M81), this grand spiral galaxy in Ursa Major is bright, well-positioned for northern observers, and sits right next to one of the most dramatic galaxies you can observe — the Cigar Galaxy (M82). Together, they’re one of the finest galaxy pairs in the entire sky.

What Makes M81 Special?

M81 is a grand-design spiral galaxy located about 11.8 million light-years away. It’s roughly the same size as our Milky Way, with sweeping spiral arms, a bright central bulge, and active star-forming regions along its arms. At magnitude +6.9, it’s one of the brightest galaxies visible from Earth — just barely below naked-eye visibility under exceptional conditions.

What really makes M81 worth your time is the company it keeps. M82, the Cigar Galaxy, sits just 38 arcminutes to the north — close enough that both galaxies fit comfortably in the same low-power eyepiece field. The two galaxies are gravitationally interacting, and M81’s tidal forces triggered a massive burst of star formation in M82, giving it that dramatic starburst appearance.

How to Find M81 and M82

This is one of the easiest galaxy pairs to locate. You just need the Big Dipper:

1. Find Dubhe and Merak, the two pointer stars at the front of the Big Dipper’s bowl (the same ones you’d use to find Polaris, but go the opposite direction).
2. Draw a line from Merak through Dubhe and continue roughly the same distance beyond Dubhe (about 10 degrees).
3. M81 and M82 will be in that area. In a finderscope, M81 appears as the brighter, rounder glow; M82 is the thinner, elongated smudge to its north.

Observing M81: What to Expect

Photographing the M81/M82 Pair

This galaxy pair is a top-tier astrophotography target. The fact that both galaxies fit in the same field of view at moderate focal lengths makes for a dramatic composition.

• Focal length: 300-600mm captures both galaxies with surrounding star field. 800mm+ fills the frame with M81 alone for maximum spiral arm detail.
• Exposure: Start with 2-3 minute subs at ISO 800. Stack 40-60 frames. M81’s core is bright, so watch for overexposure there.
• Processing tip: Careful stretching reveals the faint outer spiral arms of M81 and the hydrogen filaments streaming from M82. H-alpha data adds the dramatic red jets above and below M82.

There’s something called Integrated Flux Nebula (IFN) in this region — extremely faint dust clouds in our own Milky Way that reflect starlight. Deep exposures (many hours of integration) can reveal wispy galactic cirrus in the same frame as M81 and M82. It’s one of the most beautiful wide-field targets in all of astrophotography.

New to imaging? Start with our astrophotography beginner’s guide before tackling this target.

M81 vs. Other Bright Galaxies

How does M81 stack up against other popular galaxy targets?

M81 offers the best of both worlds: it’s bright enough to observe from less-than-perfect skies, but detailed enough to reward deep observation and imaging. And having M82 right next door makes every observing session a two-for-one deal.

Best Time to Observe

M81 is circumpolar from most Northern Hemisphere locations, meaning it never fully sets. However, it’s at its highest and best from January through May, when Ursa Major climbs high in the evening sky. Spring is peak M81 season.

If you’re planning tonight’s observing session, check what’s visible tonight to see what else is well-placed alongside M81.