🌑 LDN 1604
Object data
| Type | Dark nebula |
|---|---|
| Constellation | Monoceros |
| Right ascension | 6h28m47.3s (97.1970°) |
| Declination | +11°38'01" (+11.6335°) |
| Magnitude | (no magnitude data) |
| Apparent size | 6.06′ |
| Other designations | LDN 1604 |
A Lynds dark nebula in Monoceros. Opacity class 5 (1 = faintest to 6 = darkest).
Midnight transit date (best season to observe and image)
Location: Tokyo (change)
Around Dec 24, 2026
The date it transits around midnight (transit altitude about 66°)
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 17 evening – Oct 18 dawn) · Location: Tokyo (full darkness = end of astronomical dusk to start of dawn, altitude ≥ 15°)
Moon tonight: Waxing crescent (age 5.6 days, 31% illuminated)
Oct 17 23:06 – Oct 18 4:24
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 17:03 → Dusk 18:28 → Dawn 4:24 → Sunrise 5:49