Hole in a cluster, NGC6811. Or two holes in two clusters?

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John Baars Netherlands
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Hole in a cluster, NGC6811. Or two holes in two clusters?

#1

Post by John Baars »


I was out last night with my 150mm F5 Achromat cruising through Hercules,Lyra and Cygnus. I remembered a nice one, nicknamed Hole in a cluster. A quick look in Sky Safari told me that its real name is NGC6811. I remembered a neighboring cluster with a hole too. No Name. No name? No. Interstellarum Deepsky Atlas has no name for it. Neither has Stropek. Uranometria has never heared of it, Skysafari doesn't know. Wikisky.org shows it nicely, but no name.

I entered NGC 6811 in the Skysensor and there she was. Here nameless neighbor was there too. Unbelievable! It is such a lovely pair in one field of view! Two clusters, two holes. The song from West Side Story, "There's a place for us'', sprang into my mind. A variation on it then. "There's no name for us".
They obviously are a visual pair. Some years ago someone told me there is a name. But I forgot. And so have all atlases.Who gives this lovely pair a proper name? Like Romeo and Juliet. Ngc6811 Hole in a cluster and ...........

Artistic impression of the pair:
NGC 6811 Hole in a cluster.JPG

Just to be sure: NGC 6811 is at the bottom of the impression.
Her like-minded counterpart on top.
You'll have to check for yourself and meet the beauty of the two. This simple sketch doesn't show it.
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

#2

Post by pakarinen »


Intriguing! I'll have to take a look; might be in my log book, but don't recall off the top of my head.
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

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Post by notFritzArgelander »


The double doughnut cluster? ;)
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

#4

Post by helicon »


Very interesting observation and sketch John and Congratulations on winning the VROD for today!
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

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Post by Butterfly Maiden »


Congratulations on the VROD John :clap:
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

#6

Post by John Baars »


Found it!
But once again not a real name. Somebody called it in his observers-log the HD84938 group, with the star HD84938 being the brightest star. Not a real name, more a designation. It is just like someone asking me who I am and me answering: Member of my fathers' family!
What the observer and I agree upon is the fact that it looks a bit like a ring.
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

#7

Post by Gordon »


Congratulations on the VROD John!

Well deserved!
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

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Post by Makuser »


Hi John. A very nice report from you with the 150mm F5 Achromat telescope and NGC6811. I came up empty too looking for the designation of the other hole in the center open cluster. Thanks for you report, another excellent sketch, and congratulations on winning the TSS VROD Award today.
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

#9

Post by Graeme1858 »


Stellarium calls The hole in a cluster "Nefertiti's Headpiece" Perhaps the cluster with no name is Akhenaten's headpiece?

Congratulations on the VROD John.

Regards

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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

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Post by kt4hx »


Nice sketch and excellent report John. Curious targets indeed and congrats on the VROD. By the way you beat me to the name of your mystery group. It is an asterism from the Deep Sky Hunter's asterism catalogue. It is the HD 184938 group (you dropped the "1" from the catalogue designation). The catalogue lists it at 20' diameter and it certainly is a fine looking grouping.

Here is a screen capture from the C2A planetarium program that shows the two objects you sketched. This is the only planetarium program that I'm aware of that plots the DSH asterisms.
HD 184938 Group.jpg
Alan

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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

#11

Post by Michael131313 »


Thanks for the report John. I did not realize that. Congratulations on the VROD.
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

#12

Post by Ylem »


Congratulations on the VROD!
Awesome sketch also!
Clear Skies,
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

#13

Post by Bigzmey »


Nice looking pair John. I checked my master list and NGC6811 is there but I have not seeing yet. Thanks for bring it to the attention. Love the sketch! Congrats on VROD!
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

#14

Post by John Baars »


Thanks to all for your kind remarks.

@Graeme1858 Great idea! Nefertiti and Echnaton! ( Or Akenathen) My version of Stellarium doesn't come up with the name Nefertiti in the search box. Thanks for searching!

@kt4hx Finally a program that recognizes the HD 184938 group! Great, thanks for your efforts!
Refractors in frequency of use : *SW Evostar 120ED F/7.5 (all round ), * Vixen 102ED F/9 (vintage), both on Vixen GPDX.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

#15

Post by Graeme1858 »


Maybe there is no name for the cluster because all records of Akenathen were destroyed in Tutankhamun's time!

Capture.JPG
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Re: Hole in a cluster, NGC6811. Or two holes in two clusters?

#16

Post by John Baars »


Graeme1858 wrote: Tue Jun 08, 2021 1:16 pm Maybe there is no name for the cluster because all records of Akenathen were destroyed in Tutankhamun's time!
:lol:
Refractors in frequency of use : *SW Evostar 120ED F/7.5 (all round ), * Vixen 102ED F/9 (vintage), both on Vixen GPDX.
GrabnGo on Alt/AZ : *SW Startravel 102 F/5 refractor( widefield, Sun, push-to), *OMC140 Maksutov F/14.3 ( planets).
Most used Eyepieces: *Panoptic 24, *Morpheus 14, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Commonly used bino's : *Jena 10X50 , * Canon 10X30 IS, *Swarovski Habicht 7X42, * Celestron 15X70, *Kasai 2.3X40
Rijswijk Public Observatory: * Astro-Physics Starfire 130 f/8, * 6 inch Newton, * C9.25, * Meade 14 inch LX600 ACF, *Lunt.
Amateur astronomer since 1970.
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