💫 Abell 4
Object data
| Type | Planetary nebula |
|---|---|
| Constellation | Perseus |
| Right ascension | 2h45m25.9s (41.3580°) |
| Declination | +42°32'36" (+42.5433°) |
| Magnitude | (no magnitude data) |
| Apparent size | 0.33′ |
| Other designations | Abell 4 |
A planetary nebula in Perseus (Abell catalog of planetary nebulae).
Midnight transit date (best season to observe and image)
Location: Tokyo (change)
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 11 evening – Oct 12 dawn) · Location: Tokyo (full darkness = end of astronomical dusk to start of dawn, altitude ≥ 15°)
Moon tonight: Waxing crescent (age 1.1 days, 1% 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 17:11 → Dusk 18:36 → Dawn 4:19 → Sunrise 5:44