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JimPie
sage
Reged: 11/10/07
Loc: S.E.Michigan
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Herschels mistaken planitary
#3112712 - 05/18/09 03:35 PM Attachment (59 downloads)
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Discovered on May 12, 1787 by William Herschel NGC 6229 was first recorded as a planetary nebula. The globular cluster is located 8 degrees north east of Eta Hercules. Its listed at a distance of 100,000Ly.
Its small bright and compact and its easy to see why Sir William mistook this for a planetary. At low power it has a bright core , and is fairly round in appearance.
At higher magnification it has a slightly more oblong shape running north to south. The core becomes somewhat box shaped. Not much detectable granulation. And I could not resolve any stars at 152x.
Edited by JimPie (05/18/09 05:04 PM)
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frank5817
Postmaster
Reged: 06/13/06
Loc: Illinois
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Re: Herschels mistaken planitary
[Re: JimPie]
#3113417 - 05/18/09 10:37 PM
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Jim,
Very nice sketches, they both look great.   This is that third globular in Hercules that is fairly easy to locate even in poor skies.
Frank 
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cildarith
Carpal Tunnel
Reged: 08/26/04
Loc: San Diego, CA
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Re: Herschels mistaken planitary
[Re: frank5817]
#3113510 - 05/18/09 11:22 PM
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Excellent sketch Jim! 
Parenthetical note: Herschel actually had quite a few mistaken planetaries, many of them are galaxies.
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Dr Morbius
Post Laureate
Reged: 02/06/07
Loc: ManorvilleNY-but not for long
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Re: Herschels mistaken planitary
[Re: cildarith]
#3113580 - 05/19/09 12:14 AM
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I agree, very nice sketch! 
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rolandlinda3
Post Laureate
Reged: 01/24/06
Loc: Crozet VA 22932
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Re: Herschels mistaken planitary
[Re: Dr Morbius]
#3113715 - 05/19/09 02:05 AM
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Both good sketches and nice to see the comparison/side-by-side presentation. Well done. Roland
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JayinUT
I'm not Sleepy
Reged: 09/19/08
Loc: Utah
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Re: Herschels mistaken planitary
[Re: rolandlinda3]
#3114099 - 05/19/09 09:29 AM
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Jim,
I agree that I also like the contrasting images side by side. Nicely done and good background information.
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CarlosEH
Postmaster
Reged: 01/19/05
Loc: Pembroke Pines, Broward County...
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Re: Herschels mistaken planitary
[Re: JayinUT]
#3117937 - 05/21/09 12:27 AM
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Jim,
An excellent observation of NGC 6229 showing the globular cluster resolved at higher magnification. Thank you for sharing it with us all.
Carlos
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JimPie
sage
Reged: 11/10/07
Loc: S.E.Michigan
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Re: Herschels mistaken planitary
[Re: CarlosEH]
#3122209 - 05/23/09 03:38 AM
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Thanks everyone.
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kraterkid
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Reged: 03/07/05
Loc: Jacumba, California
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Re: Herschels mistaken planitary
[Re: JimPie]
#3124484 - 05/24/09 01:15 PM
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Jim, wonderful side by side views of this somewhat oblong GC!
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