Caldwell 23
Galaxy in Andromeda · 24.601 million light-years (est. from redshift)
🔭 Explore Caldwell 23 in the 3D map →View Caldwell 23 images →| Type | Galaxy |
|---|---|
| Constellation | Andromeda |
| Right ascension | 2h 22m 33s |
| Declination | +42° 21′ |
| Object distance | 24.601 million light-years (est. from redshift) |
| Apparent magnitude | 10 |
| Apparent size | 13′ (arc-minutes) |
| Approx. true diameter | 93,032 light-years across |
| Also known as | C23 · NGC 891 |
Although it appears about 13′ wide on the sky, its real span is roughly 93,032 light-years — the difference is a measure of how far away it lies.
Observing Caldwell 23
Caldwell 23 lies in the constellation Andromeda and is best placed in the evening sky around October. Its maximum altitude above the horizon depends on your latitude. It is best placed for observers in the northern hemisphere, and sits low for those far south. A small backyard telescope will show it; binoculars may hint at it under dark skies. Note that the listed magnitude is spread across the whole object — diffuse galaxies and nebulae are often harder to see than the number alone suggests, so dark, moonless skies help a great deal.
See Caldwell 23 in Universe Finder
Open the interactive 3D map to fly to Caldwell 23 and see it in context among the real stars around it. Launch the 3D view →
Sources
- Position, magnitude and angular size from the OpenNGC catalogue (Mattia Verga).
- Object identity cross-referenced with SIMBAD (CDS, Strasbourg).
- Image credits and the original observation source are linked with each photograph.
Related objects
- Andromeda Galaxy — galaxy
- Triangulum Galaxy — galaxy
- Whirlpool Galaxy — galaxy
- Sombrero Galaxy — galaxy
- Messier 110 — galaxy