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M106 - a Spiraled Beacon in the Hounds of Spring
Messier 106 is a bright and elegant spiral galaxy located in the constellation Canes Venatici, just below the Big Dipper’s handle. Shining at magnitude 8.4 and spanning about 30 million light-years from Earth, this galaxy is a rewarding target for springtime observers, especially those with moderate to large telescopes.

What makes M106 so enticing is its striking spiral structure and bright, elongated core. Unlike many faint galaxies, M106 reveals detail even under average skies—its disk stretches nearly 20 arcminutes across, appearing as a hazy oval with hints of spiral arms in larger scopes. Under dark skies, experienced observers can tease out subtle texture, asymmetry, and even dust lanes.

M106 is also an active galaxy, housing a supermassive black hole at its center, which fuels unusual X-ray and radio emissions. While invisible in visual observation, knowing this adds intrigue to the experience—you’re peering into a galaxy with a dynamic, energetic heart.

M106 offers a rich visual reward with scientific depth. Whether you’re galaxy-hopping through Canes Venatici or chasing down Messier objects, M106 is a highlight that blends beauty with mystery.


M106
Rating: 🔵 Stagazer FavoriteLevel: 🟢 ModerateHow: When: Feb - Jul
🌟 A Bright and Easily Visible Galaxy
M106 is one of the brightest spiral galaxies in the Messier catalog, making it accessible even in small to medium telescopes. Unlike many faint galaxies that require very dark skies, M106’s luminous core and extended disk are visible even from moderately light-polluted areas.
🌟 Spiral Structure with Intriguing Details
In medium to large telescopes under dark skies, M106 reveals more than just a bright core—it shows hints of spiral arms, dust lanes, and asymmetry. This makes it a great target for observers seeking galaxies that offer visible structure, not just faint fuzz.
🌟 Fascinating Active Galaxy Status
Messier 106 isn’t just beautiful—it’s scientifically fascinating. It harbors a supermassive black hole at its center and emits strong X-rays and radio waves. While these features aren’t visible, knowing you’re observing a galaxy with an active nucleus adds depth and wonder.
🌟 Moderately Easy to Find Using the Big Dipper
M106 is conveniently located just seven degrees from Phecda, the star at the bottom-left of the Big Dipper’s bowl. This makes it an excellent introduction to galaxy hunting for beginners and a satisfying quick target on spring nights.
🌟 Great for Astrophotography
Astrophotographers prize M106 for its size, brightness, and subtle detail. Long exposures reveal glowing spiral arms, jets, and colorful star-forming regions. Even basic imaging setups can capture its extended disk and luminous halo.
🌟 Part of a Rich Galaxy Neighborhood
Located in the same region as other Messier objects like M94 and M63, M106 can be part of a productive galaxy-hopping session. Observers can enjoy a night sweeping through Canes Venatici and nearby Ursa Major, comparing shapes, brightness, and structure among galaxies.
M106
NamesMessier 106, NGC 4258ConstellationCanes VenaticiDistance25 million ly
RA, Dec12h 20m 14s, +47° 09' 45"Angular Size17.0' x 7.2'Magnitude+8.31
Angular
Size
vs
Moon
DSO TypeSpiral galaxy: a galaxy with a flat, rotating disk of stars, gas, and dust, featuring winding spiral arms and a central bulge.
M106
The easiest way to find Messier 106 is by using the Big Dipper as your guide.
Find the Big Dipper. Then find Phecda (+2.43), the bright star in the lower-left corner of the cup.
Look below the Big Dipper's handle for the two stars of Canes Venatici, bright Cor Caroli (+2.89) and the much dimmer Char (+4.25).
M106 is almost exactly halfway between Chara and Phecda. Using your telescope's finder, point to the halfway point. Then use a low-powered eyepiece to find M106. It will appear as a faint, elongated glow—especially under dark skies. Explore using higher power.
M106
Start at the Big Dipper’s Bowl
Use Phecda (Gamma Ursae Majoris), the bottom-left star of the Big Dipper’s bowl, as your starting point. From there, move about 7° south to locate Messier 106. It’s bright enough to be picked up in a finderscope or low-power eyepiece.
Use Medium to High Magnification
Once centered, switch to medium or high power to enhance contrast and bring out the galaxy’s shape. This helps reveal its bright core and the faint elongation of its disk.
Observe Under Dark Skies
While M106 is fairly bright, dark skies (Bortle 1–4) dramatically improve the visibility of its extended disk and any trace of spiral arms. Light pollution flattens detail and makes it look like a bland oval.
Let Your Eyes Adapt
Spend at least 20 minutes in darkness before observing. Full dark adaptation allows you to pick out faint features near the edges of the galaxy and improves contrast across the whole field.
Try Averted Vision
Look slightly to the side of the galaxy rather than directly at it. This helps reveal more of its faint halo and hints of structure, especially in moderate telescopes.
Compare with Nearby Galaxies
After viewing M106, swing over to nearby M94 or M63 in Canes Venatici. Comparing them gives you a better appreciation of M106’s brightness, structure, and dynamic nature.
M106
Naked Eye
With the naked eye, Messier 106 is completely invisible due to its distance and relatively faint surface brightness.
⚠️ Binoculars
In binoculars, it may be detectable under dark skies as a very faint, soft glow, but it lacks any shape or detail and can be easily overlooked among background stars.
Small Telescope
Through a small telescope, around 3 to 4 inches in aperture, M106 appears as a slightly elongated, diffuse patch with a brighter central core. The overall structure is subtle, and no detail beyond the core and general shape is visible.
Medium Telescope
In a medium telescope of 6 to 8 inches, the galaxy becomes far more rewarding—the core appears strong and luminous, and the oval disk becomes broader and more defined. Under dark skies, careful observation can reveal asymmetry and faint extensions suggesting spiral arms.
Large Telescope
With a large telescope, 10 inches or more, Messier 106 transforms into a galaxy with texture and depth. The core blazes with brightness, and the extended disk shows curved arms, faint dust lanes, and uneven brightness that hint at its active, dynamic nature. The full size of the galaxy becomes more apparent, and in excellent conditions, its subtle structure invites longer, more detailed observation.
M106
Messier 106 is a rewarding target in dark skies, where its core and spiral structure can shine. It remains visible in moderate conditions, but heavy light pollution quickly erases the details that make this galaxy worth the visit.
🟣 In Bortle 1–2 skies, Messier 106 is striking. Its bright core stands out clearly, and the galaxy’s elongated disk is broad and well-defined. With patience and good optics, faint spiral arms and uneven brightness across the disk become visible, giving a real sense of its structure.
🔵 Under Bortle 3–4 skies, M106 still impresses. The bright core and overall shape are easily seen, and hints of asymmetry or faint extensions may be visible. The galaxy retains its elongated glow, though fine detail is softer and less distinct.
🟡 In Bortle 5–6 conditions, M106’s core remains visible and somewhat prominent, but its disk fades into the background. The galaxy looks more like a bright oval haze, and the surrounding faint structure is mostly lost to skyglow.
🟠 In Bortle 7+ skies, the view is greatly diminished. Only the central glow may be visible, appearing as a small, featureless smudge. The outer disk and any hint of structure are completely washed out.