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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:
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.
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.
Intriguing! I'll have to take a look; might be in my log book, but don't recall off the top of my head.
============================================================================= I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do. =============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
Very interesting observation and sketch John and Congratulations on winning the VROD for today!
-Michael Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50 Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl Camera: ZWO ASI 120 Naked Eye: Two Eyeballs Latitude: 48.7229° N
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.
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.
Gordon
Scopes: Explore Scientific ED80CF, Skywatcher 200 Quattro Imaging Newt, SeeStar S50 for EAA.
Mounts: Orion Atlas EQ-g mount & Skywatcher EQ5 Pro.
ZWO mini guider.
Image cameras: ZWO ASI1600 MM Cool, ZWO ASI533mc-Pro, ZWO ASI174mm-C (for use with my Quark chromosphere), ZWO ASI120MC
Filters: LRGB, Ha 7nm, O-III 7nm, S-II 7nm
Eyepieces: a few.
Primary software: Cartes du Ciel, N.I.N.A, StarTools V1.4.
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 TSSVROD Award today.
Marshall
Sky-Watcher 90mm f/13.8 Maksutov-Cassegrain on motorized Multimount
Orion Astroview 120ST f/5 Refractor on EQ3 mount
Celestron Comet Catcher 140mm f/3.64 Schmidt-Newtonian on alt-az mount
Celestron Omni XLT150R f/5 Refractor on CG4 mount with dual axis drives.
Orion 180mm f/15 Maksutov-Cassegrain on CG5-GT Goto mount.
Orion XT12i 12" f/4.9 Dobsonian Intelliscope.
Kamakura 7x35 Binoculars and Celestron SkyMaster 15x70 Binoculars. ZWO ASI 120MC camera.
>)))))*>
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.
Alan
Scopes: Astro Sky 17.5 f/4.5 Dob || Apertura AD12 f/5 Dob || Zhumell Z10 f/4.9 Dob ||
ES AR127 f/6.5 || ES ED80 f/6 || Apertura 6" f/5 Newtonian
Mounts: ES Twilight-II and Twilight-I
EPs: AT 82° 28mm UWA || TV Ethos 100° 21mm and 13mm || Vixen LVW 65° 22mm ||
ES 82° 18mm || Pentax XW 70° 10mm, 7mm and 5mm || barlows
Filters (2 inch): DGM NPB || Orion Ultra Block, O-III and Sky Glow || Baader HaB
Primary Field Atlases: Uranometria All-Sky Edition and Interstellarum Deep Sky Atlas
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"Astronomers, we look into the past to see our future." (me)
"Seeing is in some respect an art, which must be learnt." (William Herschel)
"What we know is a drop, what we don't know is an ocean." (Sir Isaac Newton)
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“Some people without brains do an awful lot of talking, don't you think?” (Scarecrow, The Wonderful Wizard of Oz)
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!
@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. Amateur astronomer since 1970.
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!
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.