Messier Objects 1-50 from Mt. Stony Brook

M1 The Crab Nebula. This nebula is a supernova remnant. The star is belived to have died in 1054 when Chinese astronomers saw a new star in this area of the sky. It is about 6,000 light years (lty) from us and is about 9th magnitude.

M2 Globular Cluster in Aquarius. M2 is a bright cluster 50,000 lty away from Earth. It is equivalent to a magnitude 7 star. This cluster has very few variable stars.

M4 Globular Cluster in Scorpius. An even brighter cluster ( 6th mag), M4 is near the star Antares. It is about 10,000 lty from us and 14 arc minutes in diameter.

M5 Globular Cluster in Serpens. At a magnitude of 6, this bright cluster is rich with variable stars known as RR Lyrae stars. It is about 30,000 light years (lty) from us.

M10 Globular Cluster in Ophiuchus. This globular cluster in Ophiuchus is about 7th magnitude, just below the limit of detection by the unaided eye. It is about 16,000 lty away from us.

M12Another Globular Cluster in Ophiuchus. This cluster is a twin to M10 in size and distance.

M13 This is a globular cluster in Hercules. The total light is about 6th magnitude, making a fairly easy object to observe with a small telescope. This cluster is 25,000 lty away.

M14 Globular Cluster in Ophiuchus. M14 is an 8th mag cluster seen in the Milky Way. It is about 23,000 lty away, and 55 lty across!

M15 Globular Cluster in Pegasus. This cluster has been called "the breath of Pegasus" since it is near the flying horse's head. It is 40,000 lty away and is the only known globular cluster with a planetary nebula.

M16 Cluster and Nebula in Serpens. This cloud of gas and dust shines from the light of the cluster of hot stars. This is also known as the Eagle Nebula (look hard for the eagle). It is at a distance of 7,000 lty.

M20 The Trifid Nebula,upper portion. This diffuse nebula in Sagittarius is a cloud of dustand gas. A 7th magnitdue O7 star (a hot star) is embedded in the nebula. It is the light from this star that allows us to see the gas and dust.

M22 Globular Cluster in Sagittarius. The first sighting of this cluster was probably by A Ihle in the yeaar 1665. This cluster lies approximately 10,000 lty away.

M27 The Dumbbell Nebula. M27 is a planetary nebula where the gas is from a central star that illuminates the nebula. This can be found in the constellation Vulpecula. J. Petreshock also took this image.

M29 An open cluster in Cygnus. This cluster of stars is about 7 arc minutes across and at a distance of 7,200 lty.

M32 M32 is a compain galaxy to the famous Andromeda Galaxy(M31). The visual magnitude is 8.7 and is about 24 arc minutes south of M31's core.

M39 Open Cluster in Cygnus. This is an open cluster of stars. Note the difference between an open cluster and a globular cluster(such as M10 or M12). It is 900 lty awway from Earth.

M42 The Orion Nebula. This very famous nebula is a cloud of gas and dust that is illuminated by a group of hot young stars in the center. This object can be seen by the naked eye as the sword of Orion. Image taken by A. Milner, J. Petreshock, S. Schell, R. Lindenfeld, N. Adams and S. Wolk

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