Globular cluster · Ophiuchus

M9

Also known as: NGC 6333

mag 7.99′ across

About

M9 is a globular cluster of magnitude 7.9 in Ophiuchus, about 9′ across.

M9 is in the constellation Ophiuchus.
Best evenings: around late July it is highest at about 9 pm (10 pm in summer time); a month earlier, two hours later.
Where on Earth: it is seen well, at least 10° up, from south of 61° N.

When it rises and sets tonight, how high it climbs and how much the Moon gets in the way are worked out in your browser for your place.

EyesNot visible to the naked eye.
Binoculars (10×50)A small fuzzy star.
Telescope (6–8 inch)A bright round glow; its edges break into stars at high power.

For a dark country sky with no Moon. From a city, faint galaxies and nebulae can disappear completely.

Designations	M9, NGC 6333
Type	Globular cluster
Magnitude	7.9The smaller the number, the brighter.
Apparent size	9′the full Moon is 31′ across
Surface brightness	≈ 21.3 mag/arcsec²Estimate from the magnitude and size, per square arcsecond.
Constellation	Ophiuchus
Right ascension (J2000)	17h 19m 11.8s
Declination (J2000)	−18° 30′ 58″