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Sagittarius

M22, Great Sagittarius Cluster

Target Type R.A. Dec. Constellation Magnitude Size M22 (NGC 6656)Great Sagittarius Custer Globular Cluster 18h 36m 24s -23° 54′ 17″ Sagittarius 5.09 32.0 arcmin Overview This bright, magnitude five cluster burns with the ferocity of half a million stars crammed into half a degree of the sky – about the same width as the full …

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M25, Open Cluster in Sagittarius

Target Type R. A. Dec. Constellation Magnitude Size M25 (IC 4725) Open Cluster 18h 31m 47s -19° 07′ 00″ Sagittarius 4.59 29.0 arcmins Overview This pleasing little cluster was first discovered in 1745 by Philip Loys de Chésaux and later seen by Messier himself in June 1764. Messier described it as “a cluster of faint …

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Omega Nebula M17

Target Type R. A. Dec. Constellation Magnitude Size Omega Nebula Diffuse Nebula 18h 20m 48s -16° 11′ 00″ Sagitarius +6.0 46.0′ x 37.0′ Overview After the Orion nebula, the Omega nebula is the brightest nebula visible to those of us living in mid-northern latitudes. Also known as the Swan, Horseshoe, or Lobster Nebula, this object …

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The Crescent Nebula, NGC 6445

Target Type R. A. Dec. Constellation Magnitude Size Crescent Nebula Planetary Nebula 17h 50m 06s -20° 21′ 56″ Sagitarius +10.9 0.6′ x 0.5′ Overview The first two challenges this month are relatively easy, so I thought I’d balance things out with a trickier observing challenge. The crescent nebula can be glimpsed with smaller scopes under …

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