💫 C27 (Crescent Nebula)
Object data
| Type | Emission nebula |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h12m06.1s (303.0255°) |
| Declination | +38°21'00" (+38.3500°) |
| Magnitude | mag 7.4 |
| Apparent size | 20′ × 10′ |
| Other designations | NGC 6888 |
The Crescent Nebula in Cygnus — an emission nebula around a Wolf–Rayet star, named for its crescent shape.
Midnight transit date (best season to observe and image)
Location: Tokyo (change)
The date it transits around midnight (transit altitude about 87°)
This date has already passed this year. Next year (2027) it will be around Jul 21.
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
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.
Sunset 17:13 → Dusk 18:37 → Dawn 4:19 → Sunrise 5:43