🌌 C23 (Silver Sliver Galaxy)
Object data
| Type | Galaxy |
|---|---|
| Constellation | Andromeda |
| Right ascension | 2h22m32.9s (35.6370°) |
| Declination | +42°21'00" (+42.3500°) |
| Magnitude | mag 10 |
| Apparent size | 13.5′ × 2.5′ |
| Other designations | NGC 891 |
A galaxy in Andromeda — a thin spiral seen edge-on.
Midnight transit date (best season to observe and image)
Location: Tokyo (change)
Around Oct 23, 2026
The date it transits around midnight (transit altitude about 83°)
For about 2–3 weeks either side of this date, the object stays high from evening to dawn — its observing season.
Best time to observe tonight
Tonight (Oct 10 evening – Oct 11 dawn) · Location: Tokyo (full darkness = end of astronomical dusk to start of dawn, altitude ≥ 15°)
Moon tonight: New moon (age 29.2 days, 0% illuminated) — Little moonlight — a good time for faint objects
Oct 10 18:37 – Oct 11 4:19
Hours of full darkness (end of astronomical dusk to start of dawn) when it is above 15° — the darkest sky, mostly clear of buildings and trees.
Night (sunset – sunrise)
Full darkness (dusk – dawn)
Moon up (darker = brighter moon)
Best time to observe (thick line)
Now
Sunset 17:13 → Dusk 18:37 → Dawn 4:19 → Sunrise 5:43