The other, perfect double double in Lyra.

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John Baars Netherlands
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The other, perfect double double in Lyra.

#1

Post by John Baars »


Last night it seemed to be crystal clear. I put my 102mm Vixen refractor out early . Sometimes I make it a sport to visit Wega before the sun has disappeared below the horizon. That works most of the time. Then I did some tests to see which configuration I will take with me on holiday.

Epsilon Lyrae, the regular double double, with the sun still up. After sundown STF2470 and STF2474, the other double double. Skysafari knows them. Not difficult to find, it is a 3+ degree Northeast star-hop from Sulafat. The two pairs seem to be almost parallel, just not quite. Nice is that their weaker opposites are both oriented on the same western side. The two fainter ones also appear to be a different color and equally distant from their main star. All this reinforces the idea of ​​uniformity. All in all they seem, though fainter, a tad more perfect than the Epsilon-couple. This other double couple forms a nice triangle with a fifth star, a bit farther West. Together with that star of Mv. 8.9 it's a nice sight. Too bad they aren't that well known.
STF2470  and STF2474  final.jpg
Here's a sketch I made some years ago. I went over it in the computer to generate more round stars. Magnification in the 4 inch refractor was around 180 X.


Then I went necessarily back inside to pick up my short double starlist, I had written down the coordinates for that evening. When I arrived outside again, thick strings of veils and mist hang over my head. So condensed that even Wega could hardly get through. Swallow.... Then just clean up. Later in the night when I checked the sky in my flannel, during a short stop, I could see another crystal clear sky again, with Saturn and Jupiter shining perky. The temperature had dropped significantly. Eehhh... no, I didn''t feel like going outside again. There will be another 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.
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Re: The other, perfect double double in Lyra.

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Post by helicon »


Thanks for the excellent report John on a somewhat overlooked object!

Nice sketch as well. Congratulations on winning the VROD for the day!
-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
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Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl
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Re: The other, perfect double double in Lyra.

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Post by kt4hx »


Nicely done John and congrats on the VROD. I think I recall seeing this other double-double when I was observing galaxies in Lyra about four years ago. When I was hunting the mag 12.8 barred spiral UGC 11397 I picked them up not quite 1.5° northeast of the galaxy. I often run across interesting doubles while galaxy hunting but don't really research them much. But some do get etched into my memory. :)
Alan

Scopes: Astro Sky 17.5 f/4.5 Dob || Apertura AD12 f/5 Dob || Zhumell Z10 f/4.9 Dob ||
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Primary Field Atlases: Uranometria All-Sky Edition and Interstellarum Deep Sky Atlas
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Re: The other, perfect double double in Lyra.

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Post by Bigzmey »


Neat target John! Thanks for bringing it up. They are on my list by I have not gotten to observe them yet. Nice thing is that they are wider separated than the Double Double, so it is a good target to practice before attempting the original Double Double.

Congrats on the VROD!
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
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EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
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Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2407, Comets: 34, Asteroids: 255
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Re: The other, perfect double double in Lyra.

#5

Post by Unitron48 »


Very nice, John! Congrats on the VROD! I usually visit that pair when in the constellation.

Dave
Unitron (60mm, 102mm), Brandon 94
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http://www.unitronhistory.com

"Look deep into nature, and then you will understand everything better." Albert Einstein
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Re: The other, perfect double double in Lyra.

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Post by Kanadalainen »


"...another time." Such a healthy attitude John. Thanks for your report.

KInd regards,
Ian

Fracs: Stellarvue 70T f6; SW 120mm Esprit f7; "Mark Mk. II" - 60 mm Tasco f6; C80 frac f 11.4
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Re: The other, perfect double double in Lyra.

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Post by Makuser »


Hi John. A very nice observing report with the 4" Vixen refractor. And a very good sketch of this lesser known double- double. Thanks for your report John and congratulations on receiving the TSS VROD Award.
Marshall
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Celestron Omni XLT150R f/5 Refractor on CG4 mount with dual axis drives.
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Re: The other, perfect double double in Lyra.

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Post by Butterfly Maiden »


Another great report John, and congratulations on receiving the TSS VROD award for your effort.
Vanessa

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Olympus DPS-1 10x50 binoculars.
Leica 8x32BN binoculars.
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