M39 (NGC 7092)
Also known as M39 · M 39 · NGC 7092
M39 (NGC 7092) is an open star cluster in the constellation Cygnus, about 1,010 light-years from Earth.
Facts
| Type | Open star cluster |
|---|---|
| Constellation | Cygnus |
| Position (J2000) | 21h 31m 48s, +48° 26′ |
| Distance | 1,010 light-years (its light set off about 1,010 years ago) |
| Brightness | magnitude 4.6 (smaller is brighter; the faintest stars the eye sees are about 6) |
| Size on the sky | 120.4′ × 120.4′ (the full Moon is about 31′) |
| Filter | No filter (It shines in starlight of every colour, so a nebula filter would only dim it; a dark sky helps more.) |
| Studied in | 251 scientific papers (SIMBAD) |
When and how to see it
M39 (NGC 7092) is highest in the sky at midnight in August. From India (about 20° N) it climbs to about 62° above the horizon; from 50° N, to about 88°. To see it you need the naked eye from a dark site.
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 Cygnus
- Cooling Tower Cluster (M29)
- Cygnus A
- Cygnus X-1
- Egg Nebula
- Fireworks Galaxy
- North America Nebula
- Pelican Nebula
- Veil Nebula
Everything in Cygnus · All 88 constellations · All sky objects
Data: SIMBAD (CDS, Strasbourg; the site's weekly copy) · OpenNGC · Data sources & credits