Of all the galaxies visible from a backyard telescope, few are as instantly recognizable as NGC 4565, better known as the Needle Galaxy. This edge-on spiral galaxy appears as a razor-thin slash of light cutting across the field of view, with a brilliant central bulge surrounded by a distinctive dark dust lane. It is one of the finest examples of an edge-on spiral in the entire sky.
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What Makes NGC 4565 Special?
NGC 4565 sits approximately 30 to 50 million light-years away in the constellation Coma Berenices. It carries the designation Caldwell 38 in Patrick Moore’s famous catalog of deep-sky objects for amateur astronomers. With an estimated diameter of roughly 100,000 light-years, the Needle Galaxy is comparable in size to our own Milky Way.
The galaxy’s visual magnitude of approximately 10 makes it a reachable target for modest telescopes. Under dark skies, an 8-inch instrument reveals its characteristic needle-thin profile with the bright core and prominent dust lane that seem to bisect the galaxy along its equatorial plane. This dust lane is the key feature that makes edge-on spirals so photogenic for astrophotographers.
NGC 4565 was discovered by the German-British astronomer William Herschel in 1785. Its position near the North Galactic Pole means we view it relatively unobscured by the dust and gas of our own Milky Way plane, contributing to its prominence in spring skies.
Why Edge-On Galaxies Look Like This
When we view a spiral galaxy edge-on, we are essentially looking at it from within its galactic plane. Imagine standing at one edge of a dinner plate and looking across it. The bright central bulge is the dense cluster of stars at the galactic center, while the thin disk of the galaxy stretches out to either side.
The dramatic dark band running across the middle is not empty space. It is interstellar dust within the galaxy itself, silhouetted against the starlight behind it. This dust absorbs and scatters visible light, creating the dark lane. In a face-on view of a spiral galaxy like M101, this same dust appears as the beautiful spiral arms we associate with galaxies. But seen edge-on, it becomes a stark dividing line.
Capture Details
This image represents 106 exposures of 180 seconds each, for a total integration time of about 5 hours and 18 minutes, captured across three nights. All imaging and processing was done using NINA 3 for acquisition and Siril 1.4 for stacking and processing.
| Telescope | Orion 8″ 1000mm f/4.9 Newtonian Reflector |
| Mount | Orion Atlas EQ-G |
| Imaging Camera | Canon T3i (Full Spectrum Modification) |
| Guide Scope | Meade 800mm f/10 reduced to f/5 with Atik x0.5 focal reducer |
| Guide Camera | Meade DSI Pro Monochrome (16-bit) |
| Exposures | 106 x 180 sec (5h 18m total integration) |
| Nights | 3 |
| Acquisition | NINA 3 |
| Processing | Siril 1.4 |
| Resolution | 4997 x 3296 |
Viewing NGC 4565 Yourself
The Needle Galaxy is well placed for observing from March through June in the Northern Hemisphere. You will find it in the constellation Coma Berenices, not far from the bright star Arcturus in Bootes. Under reasonably dark skies, a 4-inch telescope will show it as a thin streak of light. An 8-inch or larger instrument begins to reveal the bright core and the dark dust lane that makes this galaxy such a rewarding target.
For astrophotographers, NGC 4565 is one of the most satisfying galaxies to image. Its high surface brightness means you can get good results with modest integration times, and its striking appearance always makes for a memorable final image.
