🌌 NGC 1640
Object data
| Type | Galaxy |
|---|---|
| Constellation | Eridanus |
| Right ascension | 4h42m14.4s (70.5600°) |
| Declination | -20°26'05" (-20.4348°) |
| Magnitude | mag 11.69 |
| Apparent size | 2.72′ × 2.6′ |
| Other designations | NGC 1640 |
A galaxy in Eridanus.
Midnight transit date (best season to observe and image)
Location: Tokyo (change)
Around Nov 27, 2026
The date it transits around midnight (transit altitude about 34°)
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 11 evening – Oct 12 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 11 23:31 – Oct 12 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 17:11 → Dusk 18:36 → Dawn 4:19 → Sunrise 5:44