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Cluster

M103, Open Cluster in Cassiopeia

Target Type R. A. Dec. Constellation Magnitude Size M103 (NGC 581) Open Cluster 01h 33m 23s +60° 39′ 00″ Cassiopeia +7.40 5.0 arcmin Overview M103 is the last object from the original catalog of objects compiled by Charles Messier. It is a small star cluster easily located near Ruchbar, one of the bright stars forming […]

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M34, Open Cluster in Perseus

Target Type R. A. Dec. Constellation Magnitude Size M34 (NGC 1039) Open Cluster 02h 42m 05s +42° 45′ 14″ Persius +5.2 35.0 arcmin Overview M34 was discovered by Charles Messier and included in his infamous catalog in 1764, although we have good reason to believe that the Italian astronomer Giovanni Battista Hodierna actually made note

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M104, Sombrero Galaxy in Virgo

Target Type R. A. Dec. Constellation Magnitude Size M104 (NGC 4594) Spiral Galaxy 12h 39m 59s -11° 37′ 23″ Virgo +8.12 8.4×4.9 arcmin Overview Pierre Mechain discovered this wonderful galaxy in 1767. Messier included it in his observation notes but didn’t add it to his catalog. That was done by Camille Flammarion who discovered Messier’s

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M5, Globular Cluster in Serpens

Target Type R.A. Dec. Constellation Magnitude Size M5 (NGC 5904) Globular Cluster 15h 18m 33s +02° 04′ 52″ Serpens 5.65 23 arcmin Overview This stunning, bright cluster is just about visible to the naked eye under perfect dark sky conditions. It was easier to see before the days of rampant light pollution and was discovered

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M13, The Great Hercules Cluster

Target Type R. A. Dec. Constellation Magnitude Size M13 (NGC 6205) Globular Cluster 16h 41m 41s +36° 27′ 36″ Hercules 5.8 20.0 arcmins Overview The Hercules cluster, the 13th object in the Messier catalog, is an easy to locate, rich cluster in the constellation of Hercules. It’s located in a sparsely populated area of sky

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M80, Globular Cluster in Scorpius

Target Type R. A. Dec. Constellation Magnitude Size M80 (NGC 6093) Globular Cluster 16h 17m 02s -22° 58′ 34″ Scorpius +7.3 10.0 arcmin Overview This bright, big, dense cluster was discovered by Charles Messier in January 1781. As with so many of his cluster discoveries, Messier believed that M80 was a ‘nebula without a star’

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M72, Globular Cluster in Aquarius

Target Type R. A. Dec. Constellation Magnitude Size M72 (NGC 6981) Globular Cluster 20h 53m 28s -12° 32′ 14″ Aquarius +9.8 6.6 arcmin Overview The 72nd entry in Messier’s catalog is the faintest of all the globular clusters listed. Just six arcminutes wide and shining fainter than magnitude 9, this is an easy object to

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M46, Open Cluster in Puppis

Target Type R. A. Dec. Constellation Magnitude Size M46 (NGC 2437) Open Cluster 07h 41m 46s -14° 48′ 00″ Puppis +6.09 20.0 arcmins Overview This open cluster in the anonymous constellation of Puppis was discovered by Charles Messier himself in February 1771. It is only 1.5° away from M47 but has quite a different character. With

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M15, Globular Cluster in Pegasus

Target Type R. A. Dec. Constellation Magnitude Size M15 (NGC 7078) Globular Cluster 21h 29m 58s +12° 10′ 01″ Pegasus +6.19 18.0 arcmin Overview Jean-Dominique Maraldi discovered M15 in 1746. Messier himself observed it in June 1764 and added it as the fifteenth object in his catalog. This relatively bright globular is easily visible in

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