Silver Sliver Galaxy
RA 2h 22m · Dec +42° 07′
5′

The quintessential edge-on spiral, often used as a textbook example of a galaxy seen exactly from the side. The dark dust lane bisecting the disc is remarkably prominent. Deep imaging reveals looping filaments of dust extending well above the plane.

Galaxy

Silver Sliver Galaxy

C 23 · Andromeda
These photons are ~27 million years old
UV/IRUV/IR-cut. Blocks ultraviolet and infrared so refractor optics stay in focus across the visible band.ZWO Seestar S50ZWO Seestar S50Aperture 50mm · Focal length 250mm · f/5 · Apo triplet with ED element · Sony IMX462 colour CMOS sensor (1920 x 1080, 2.1MP)…View equipment →
⧉ 14 versions of this capture — pick one to see its image and log
↻ Revisited — built over 3 nights, three months later
  1. 1 22/09/2025 20m (59 x 20s) ZWO Seestar S50, ZWO Seestar S50 Camera
  2. 2 25/09/2025 14m (81 × 10s) + 10m (60 x 10s) ZWO Seestar S50, ZWO Seestar S50 Camera
  3. 3 02/01/2026 2m (10 × 10s) + 2m (10 x 10s) ZWO Seestar S50, ZWO Seestar S50 Camera
22/09/2025 02/01/2026 Three months later
Date
02/01/2026
Location
53.5481° N, 1.4616° W
Integration
2m (10 × 10s)
Software
ZWO Seestar app
Notes
·
Total effort
2h 24m over 3 nights
Moon
🌔Waxing gibbous, 98% lit
Plate solve
Centre RA
2h 21m 53.3s
Centre Dec
+42° 06′ 50″
Field
42.8′ × 76.0′
Pixel scale
2.38″/px
Orientation
-125.4° E of N
Hemisphere
Northern
Also in this frame
C23NGC 898

Catalogued objects inside the plate-solved field, nearest the centre first. Highlighted names have their own photo here.

TelescopeZWO Seestar S50
CameraZWO Seestar S50 Camera
RigFamily Holiday Rig

Where to find it

Finder chart
+41°30′+41°40′+41°50′+42°+42°10′+42°20′+42°30′+42°40′2h19m2h19m2h20m2h21m2h21m2h22m2h23m2h23m2h24m2h25m2h25mNGC 891NGC 898NE42.8′ x 76.0′5′

Star field and catalogued objects inside the plate-solved field, oriented to the solve. Fully offline, from the bundled star and deep-sky catalogues.

Interactive sky chart centred on 2 21 53.3 +42 06 50. Drag to pan, scroll to zoom, click a star or object to identify it. Zoom in to the plate-solved field for the DSS survey photo; zoom out for constellation figures and neighbouring catalogue objects. Fully self-hosted: the star and deep-sky catalogues and the survey image are all served from this site, so nothing external loads. Imagery: DSS2 colour (STScI / POSS-II). Constellation figures © Dominic Ford (GPLv3).

Captured from · Barnsley, UK
53.5481° N, 1.4616° W · view on OpenStreetMap ↗ · Place data © GeoNames (CC BY)

Frequently asked questions

What kind of object is C 23?
C 23 is a galaxy.
Which constellation is C 23 in?
C 23 lies in the constellation Andromeda.
How far away is C 23?
The light in this image left C 23 roughly ~27 million years ago, so that is how far back in time you are seeing it.
What are the coordinates of C 23?
C 23 sits at right ascension 02h 21m 53s and declination +42° 06′ 50″ (J2000).
When is the best time to photograph C 23?
C 23 is circumpolar from around 54°N - it never sets, and rides highest (about 79° altitude) on evenings around October.
What else is in this frame?
The plate-solved field also contains NGC 898.
What equipment was used to photograph C 23?
This image of C 23 was captured with ZWO Seestar S50 and ZWO Seestar S50 Camera.
How much exposure time went into this image?
This image of C 23 represents 2m (10 × 10s) + 2m (10 x 10s) + 14m (81 × 10s) + 10m (60 x 10s) + 20m (59 x 20s) of total integration time.

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