Butterfly Cluster
Open cluster in Scorpius
An object in the observing catalogue.
Also catalogued as Butterfly Cluster, M6, Messier 6, NGC 6405
Measurements and positionShowHide
- Position
- Right ascension 17h 40m 20.8s Declination −32° 15′ 15″J2000
- Where the object sits on the sky, in the coordinate system astronomers use. Right ascension is the east–west figure and declination the north–south one; J2000 names the reference date they are measured against.
- Brightness
- 4.20
- Apparent magnitude. The scale runs backwards — a smaller number is brighter, and around 6 is roughly the faintest the unaided eye can see from a dark site.
- Apparent size
- 15.6 arcminutes
- How large the object looks from here, not how large it is. The full Moon is about 30 arcminutes across, which is a useful thing to compare against.
Catalogue data from OpenNGC (Mattia Verga) · CC-BY-SA-4.0