Globular cluster · Sagittarius

M28

Also known as: NGC 6626

mag 6.911′ across

About

M28 is a globular cluster of magnitude 6.9 in Sagittarius, about 11′ across.

M28 is in the constellation Sagittarius.
Best evenings: around mid-August 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 55° N.
Teapot: A smaller globular cluster 1° north-west of Kaus Borealis.

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 fuzzy ball, brighter towards the middle.
Telescope (6–8 inch)Resolves into a swarm of stars at medium power, with a dense core.

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

Designations	M28, NGC 6626
Type	Globular cluster
Magnitude	6.9The smaller the number, the brighter.
Apparent size	11′the full Moon is 31′ across
Surface brightness	≈ 20.7 mag/arcsec²Estimate from the magnitude and size, per square arcsecond.
Constellation	Sagittarius
Right ascension (J2000)	18h 24m 32.9s
Declination (J2000)	−24° 52′ 11″