Globular cluster · Pegasus

M15 Pegasus Cluster

Also known as: NGC 7078

mag 6.412′ across

About

M15, the Pegasus Cluster, is a globular cluster of magnitude 6.4 in Pegasus, about 12′ across.

M15 is in the constellation Pegasus.
Best evenings: around late September 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 north of 68° S.
Great Square of Pegasus: A bright globular cluster 4° beyond Enif, the Horse’s nose; binoculars.

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	M15, NGC 7078, PN G065.0-27.3
Type	Globular cluster
Magnitude	6.4The smaller the number, the brighter.
Apparent size	12′the full Moon is 31′ across
Surface brightness	≈ 20.4 mag/arcsec²Estimate from the magnitude and size, per square arcsecond.
Constellation	Pegasus
Right ascension (J2000)	21h 29m 58.4s
Declination (J2000)	+12° 10′ 00″