A Side View of the Milky Way’s Twin: NGC 891

From the skies of the United Arab Emirates, I photographed the edge-on spiral galaxy NGC 891, also known as the Silver Sliver Galaxy. This massive spiral, lying in the constellation Andromeda about 30 million light-years away with an apparent magnitude of ~10.0, closely resembles our own Milky Way if seen perfectly edge-on, with a dark dust lane slicing through its bright stellar disk.

What makes this field remarkable is its immense cosmic depth. Surrounding NGC 891 are numerous fainter galaxies at varying distances. One of them, PGC 8947 (UGC 1807), lies about 244 million light-years away, while many others belong to the Abell 347 galaxy cluster, spanning between 200 and 320 million light-years. Still farther, faint smudges such as PGC 8948 lie at around 474 million light-years, and the most distant galaxies in this frame — PGC 2211100 and PGC 2210478 — reach nearly 950 million light-years.

In a single deep-sky image, this view captures layers of the universe stretching from a nearby spiral galaxy to systems nearly a billion light-years away.

Telescope: Sky-Watcher Quattro 200P (200 mm aperture, f/4 Newtonian reflector)
Mount: iOptron HAE43 harmonic mount
Camera: ZWO ASI183MM Pro (cooled, monochrome)
Guiding: Svbony Mini Guider Scope 30mm with ZWO ASI120MM
Filters: ZWO LRGB set with motorized filter wheel

3 hours 45 minutes of integration using LRGB filters:
30 × 180s Luminance (L)
15 × 180s Red (R)
15 × 180s Green (G)
15 × 180s Blue (B)

Software: ASIAir Plus (capture), PixInsight (stacking & processing), Photoshop (final touches)