Cave Nebula
Also known as Sh2-155
Cave Nebula is an HII region in the constellation Cepheus, about 2,740 light-years from Earth.
Bright and dark nebula in Cepheus
Facts
| Type | HII region |
|---|---|
| Constellation | Cepheus |
| Position (J2000) | 22h 56m 48s, +62° 37′ |
| Distance | 2,740 light-years (its light set off about 2,740 years ago) |
| Size on the sky | 5.3′ × 3.6′ (the full Moon is about 31′) |
| Filter | UHC (narrowband) filter (Glowing gas shines in a few colours of hydrogen and oxygen: a UHC filter passes those and blocks most light pollution and sky glow.) |
| Studied in | 103 scientific papers (SIMBAD) |
When and how to see it
Cave Nebula is highest in the sky at midnight in September. From India (about 20° N) it climbs to about 47° above the horizon; from 50° N, to about 77°.
Heights are worked out for India and for 50° N. Set your location in Settings to see them for where you are.
For tonight's best time from your own town, the darkness and the Moon, open it on the map and see its "Tonight from your location" card.
More in Cepheus
Everything in Cepheus · All 88 constellations · All sky objects
Data: SIMBAD (CDS, Strasbourg; the site's weekly copy) · Data sources & credits