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Messier 15 M15 NGC7078 Pegasus, Globular Cluster

astrophotography ccd CMOS dslr dso imaging Orion reflector SCT
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#1 rekokich

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Posted 16 November 2019 - 07:51 PM

Messier 15 M15 NGC7078 Pegasus

M15 is a globular cluster in the constellation of Pegasus composed of more than 100,000 stars. It is 175 light years in diameter,  35,000 ly distant from Earth, and approximately 12 billion years old. Due to a central black hole, M15 has undergone contraction, or "core collapse", resulting in a highly dense interior. Extensively studied, the cluster has been found to have numerous variable stars, pulsars, a doule neuron star, and a planetary nebula - the first of only four so far discovered within globular clusters.

The image was taken with a Meade 8'' ACF telescope, Celestron Edge 8'' 0.7x tele-compressor, Celestron AVX mount, Orion SSAG pro 60mm F4 autoguider, Canon T3i full spectrum modified camera, and Astronomik CLS-CCD filter.

This reprocessed image is a stack of 12 x 90 sec exposures at iso 1600, 40 darks, 40 bias, processed with DSS, XnView, and StarTools, and Neat Image. Limiting magnitude is better than 17.5.

Thank you for looking. C&C welcome.

 

M15 NGC7078 Pega 20170909-E2 Me8 200x1400mm 12x90''-1600-M-cls-60F.jpg


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#2 Astro-Master

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Posted 16 November 2019 - 09:25 PM

Nice shot, it looks like you captured the little planetary nebula at the 11:00 o'clock position. Its the little green dot just a short distance from the bright core just below a half circle of 4 equally bright stars.



#3 rekokich

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Posted 17 November 2019 - 02:25 AM

Thank you, Astro-Master. I didn't know about this object. The 15 mag planetary nebula, known as Pease 1, was found by Francis Pease in 1928. It was the first of only four planetary nebulas so far discovered which reside within globular clusters. See the following link for more information and finder charts.

http://www.messier.s...m015_ps1fc.html

 

Based on the finder charts, the nebula is marked with a red cross on the attached image. There is an oval, fuzzy object at that location but, at this scale and so close to the core, I would have a problem identifying it as a planetary nebula. Perhaps someone with a much larger telescope and an Oiii filter might take it from here.

 

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