Trifid Nebula

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Trifid Nebula The Trifid Nebula (also known as M20 and NGC 6514) is a favorite of amateur astronomers. Its name means "divided into three lobes." It was investigated in 1997 by Hubble, the orbiting space telescope, and its operating astronomers. The Hubble Space Telescope took this stunning image of the Trifid Nebula (M20) - click on it to appreciate its true beauty - which NASA describes as “Starbirth in the Trifid Nebula .” NASA tells us more about this image (which seems to sparkle once you’ve enlarge it): Tremendous pillars of gas and dust are being boiled away in the Trifid Nebula. In the center of the picturesque Trifid lies a young hot star, located above and to the right of this picture. As soon as it was born, the massive star scorched its surroundings with bright and energetic light. Nearby stars trying to form ended up starved for gas as it was swept away from them by the bright star's light and wind. Lower mass stars should continue to form in the Trifid Nebula, as over 1500 times the mass of our Sun still exists in uncondensed gas. Also known as M20, the Trifid Nebula is about 9000 light years away and easily visible with a small telescope in the constellation of Sagittarius. Click on the image for a better view. Credits: Image online, courtesy NASA. See Alignments to State and Common Core standards for this story online at: http://www.awesomestories.com/asset/AcademicAlignment/Trifid-Nebula See Learning Tasks for this story online at: http://www.awesomestories.com/asset/AcademicActivities/Trifid-Nebula.

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MESSIER 13 RA(2000) : 16H 41M 42S DEC(2000): +36° 27'
MESSIER 13 RA(2000) : 16h 41m 42s DEC(2000): +36° 27’ 41” BASIC INFORMATION OBJECT TYPE: Globular Cluster CONSTELLATION: Hercules BEST VIEW: Late July DISCOVERY: Edmond Halley, 1714 DISTANCE: 25,100 ly DIAMETER: 145 ly APPARENT MAGNITUDE: +5.8 APPARENT DIMENSIONS: 20’ Starry Night FOV: 1.00 Lyra FOV: 60.00 Libra MESSIER 6 (Butterfly Cluster) RA(2000) : 17Ophiuchus h 40m 20s DEC(2000): -32° 15’ 12” M6 Sagitta Serpens Cauda Vulpecula Scutum Scorpius Aquila M6 FOV: 5.00 Telrad Delphinus Norma Sagittarius Corona Australis Ara Equuleus M6 Triangulum Australe BASIC INFORMATION OBJECT TYPE: Open Cluster Telescopium CONSTELLATION: Scorpius Capricornus BEST VIEW: August DISCOVERY: Giovanni Batista Hodierna, c. 1654 DISTANCE: 1600 ly MicroscopiumDIAMETER: 12 – 25 ly Pavo APPARENT MAGNITUDE: +4.2 APPARENT DIMENSIONS: 25’ – 54’ AGE: 50 – 100 million years Telrad Indus MESSIER 7 (Ptolemy’s Cluster) RA(2000) : 17h 53m 51s DEC(2000): -34° 47’ 36” BASIC INFORMATION OBJECT TYPE: Open Cluster CONSTELLATION: Scorpius BEST VIEW: August DISCOVERY: Claudius Ptolemy, 130 A.D. DISTANCE: 900 – 1000 ly DIAMETER: 20 – 25 ly APPARENT MAGNITUDE: +3.3 APPARENT DIMENSIONS: 80’ AGE: ~220 million years FOV:Starry 1.00Night FOV: 60.00 Hercules Libra MESSIER 8 (THE LAGOON NEBULA) RA(2000) : 18h 03m 37s DEC(2000): -24° 23’ 12” Lyra M8 Ophiuchus Serpens Cauda Cygnus Scorpius Sagitta M8 FOV: 5.00 Scutum Telrad Vulpecula Aquila Ara Corona Australis Sagittarius Delphinus M8 BASIC INFORMATION Telescopium OBJECT TYPE: Star Forming Region CONSTELLATION: Sagittarius Equuleus BEST
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Messier Checklist and Charts
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DEEP-SKY OBSERVING This inventory of 109 deep-sky treasures rivals Charles Messier’s list in diversity and delight. /// TEXT BY MICHAEL E. BAKICH /// IMAGES BY ADAM BLOCK The Caldwell Catalog Regarding object selection, relative to M11. M20. M31. Every amateur Messier’s list, Moore slightly reduced the astronomer recognizes these designations because this trio of numbers in certain categories while deep-sky objects is found on the list of 18th-century comet increasing others. So the number of star clusters (both open and globular) and hunter Charles Messier. M11 is the Wild Duck Cluster in galaxies was reduced slightly, but the num- Scutum; M20 is the Trifid Nebula in Sagittarius; and M31 is ber of nebulae was increased. Only four the Andromeda Galaxy. But what if the letter C replaces the planetary nebulae made Messier’s list, but Moore placed 13 in the Caldwell Catalog. M in front of those numbers? Would you Likewise, Moore increased the number of recognize C11, C20, and C31? This trio of bright nebulae from five to 12. deep-sky objects is also well known, but C48 Moore also distributed his objects more perhaps not by these designations. The C (NGC 2775) widely across the sky. Sagittarius and stands for Caldwell, or more specifically, Virgo, which have 15 and 11 Messier for Caldwell-Moore, the full surname of objects, respectively, have only one well-known British astronomy popularizer Caldwell object each. Perhaps Moore Sir Patrick Moore. When it came time to thought most of the great objects in those place an identifier by each of the num- constellations were taken.
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