Messier 11 (Wild Duck Cluster) and Messier 26, Open Clusters in Scutum

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Messier 11 (Wild Duck Cluster) and Messier 26, Open Clusters in Scutum Messier 11 is one of the richest and densest open clusters, with more than 1000 stars. Through binoculars or a small telescope at certain magnifications, it has a wedge shape that may look a bit like a flock of wild ducks in flight. M26 is similar in size but contains only about 100 stars, an attractive mixture of bright and dim ones. Both of these clusters are displayed against a background of countless dimmer stars in this rich section of the Milky Way. Start by finding the Summer Triangle, which consists of the three of the brightest stars in the sky--Vega, Deneb, and Altair. The Summer Triangle is high overhead throughout the summer, and it sinks lower in the west as fall progresses. For this star hop, start from Altair in the constellation Aquila, the eagle. From Altair, follow the stars that form the middle of the eagle's body and end with three stars that form a slightly hooked "tail". Extend the line of those three stars one more step to the southwest and you will arrive at M11, which is in the small and dim constellation Scutum, the shield. After observing M11, you can look for M26 about 3.5 degrees to the south-southwest. To get to the right location, note the position of M26 relative to two stars of about magnitudes 4 and 5 in Scutum (circled in the chart below). Star hop from www.skyledge.net by Jim Mazur. Star charts created with Cartes du Ciel. .

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Appendix C A List of the Messier Objects DS=DoubleStar OC=OpenCluster GC=GlobularCluster EG = Elliptical Galaxy SG = Spiral Galaxy IG = Irregular Galaxy PN = Planetary Nebula DN = Diffuse Nebula SR = Supernova Remnant Object Common Name Type of Object Location mv Dist. (kly) M1 Crab Nebula SR Taurus 9.0 6.3 M2 GC Aquarius 7.5 36 M3 GC Canes Venatici 7.0 31 M4 GC Scorpius 7.5 7 M5 GC Serpens 7.0 23 M6 Butterfly Cluster OC Scorpius 4.5 2 M7 Ptolemy’s Cluster OC Scorpius 3.5 1 M8 Lagoon Nebula DN Sagittarius 5.0 6.5 M9 GC Ophiuchus 9.0 26 M10 GC Ophiuchus 7.5 13 M11 Wild Duck Cluster OC Scutum 7.0 6 M12 GC Ophiuchus 8.0 18 M13 Great Hercules Cluster GC Hercules 5.8 22 M14 GC Ophiuchus 9.5 27 M15 GC Pegasus 7.5 33 M16 Part of Eagle Nebula OC Serpens 6.5 7 M17 Horseshoe Nebula DN Sagittarius 7.0 5 M18 OC Sagittarius 8.0 6 M19 GC Ophiuchus 8.5 27 M20 Trifid Nebula DN Sagittarius 5.0 2.2 M21 OC Sagittarius 7.0 3 M22 GC Sagittarius 6.5 10 M23 OC Sagittarius 6.0 4.5 135 Object Common Name Type of Object Location mv Dist. (kly) M24 Milky Way Patch Star cloud Sagittarius 11.5 10 M25 OC Sagittarius 4.9 2 M26 OC Scutum 9.5 5 M27 Dumbbell Nebula PN Vulpecula 7.5 1.25 M28 GC Sagittarius 8.5 18 M29 OC Cygnus 9.0 7.2 M30 GC Capricornus 8.5 25 M31 Andromeda Galaxy SG Andromeda 3.5 2500 M32 Satellite galaxy of M31 EG Andromeda 10.0 2900 M33 Triangulum Galaxy SG Triangulum 7.0 2590 M34 OC Perseus 6.0 1.4 M35 OC Gemini 5.5 2.8 M36 OC Auriga 6.5 4.1 M37 OC Auriga 6.0 4.6 M38 OC Auriga 7.0 4.2 M39 OC Cygnus 5.5 0.3 M40 Winnecke 4 DS Ursa Major 9.0 M41 OC Canis
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108 Afocal Procedure, 105 Age of Globular Clusters, 25, 28–29 O
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