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Three John Herschel clusters (NGC110, NGC743 & NGC957)

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#1 Jef De Wit

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Posted 16 January 2021 - 06:24 AM

After almost completing the (William) Herschel 2500, the wash of interesting open clusters is getting thinner. Still, on the clear evening of January 8th (first observation session of the year) I came across some pretty clusters that father William had missed. The first, NGC 957 in Cassiopeia, was discovered by son John in 1831. It is a beautifully separated oval with two bright stars at the edge. One of these is the double star HJ 2143.

 

NGC 957 afgewerkt.png

 

The second, NGC 743 in Cassiopeia, is a striking triangle of relatively bright stars. Definitely worth a visit, even with a smaller instrument (than my 30 cm). This open cluster (or is it an asterism?) was first observed by John (in 1829). One of the bright stars has a faint companion and was labeled HJ 1098.

 

NGC 743 afgewerkt.png

 

NGC 110 is another discovery by John Herschel (1831). It is a fairly large, loose group. Although the borders are not completely clear, it remains visually appealing.

 

NGC 110 afgewerkt.png


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#2 mdowns

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Posted 16 January 2021 - 06:42 AM

This made my morning Jef. 3 fine sketches of targets I sometimes view but often pass by.Your capture of each is both realistic and interesting.Very admirable!


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#3 frank5817

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Posted 16 January 2021 - 10:43 AM

Jef,

 

Very impressive work capturing the eyepiece look of these fine open clusters in the northern sky.

 

Frank :)


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#4 Tyson M

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Posted 17 January 2021 - 05:57 AM

Very cool.


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#5 Warmvet

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Posted 17 January 2021 - 03:59 PM

Jef, wow, no small feat observing the Hershel 2500. These are some very nice cluster, I feel like a I am looking through the ep here. I finished the Herschel 400 and was nicely surprised by the many clusters I had never seen so I would guess there are more hidden treasures in the more complete list.

 

Cindy


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#6 Jef De Wit

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Posted 18 January 2021 - 07:27 AM

I finished the Herschel 400 and was nicely surprised by the many clusters I had never seen so I would guess there are more hidden treasures in the more complete list.

The number of galaxies is growing with each observing list:

 

Messier: 36% galaxies

Herschel 400: 58% galaxies

Herschel 400-II: 81% galaxies

Herschel 2500: 87% galaxies

 

The number of galaxies in the H2500 minus the H400 is 92%! So, there are some interesting open clusters but most of the objects are faint fuzzies...


Edited by Jef De Wit, 18 January 2021 - 07:28 AM.


#7 niteskystargazer

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Posted 19 January 2021 - 04:11 PM

Jef,

 

Very fine sketches of Three John Herschel clusters (NGC110, NGC743 & NGC957) smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom


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