Globular cluster · Ophiuchus

M107

Also known as: NGC 6171

mag 8.110′ across

About

M107 is a globular cluster of magnitude 8.1 in Ophiuchus, about 10′ across.

M107 is in the constellation Ophiuchus.
Best evenings: around mid-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 67° 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	M107, NGC 6171
Type	Globular cluster
Magnitude	8.1The smaller the number, the brighter.
Apparent size	10′the full Moon is 31′ across
Surface brightness	≈ 21.7 mag/arcsec²Estimate from the magnitude and size, per square arcsecond.
Constellation	Ophiuchus
Right ascension (J2000)	16h 32m 31.9s
Declination (J2000)	−13° 03′ 13″