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Chaple's Arc, 4 Sep 06

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#1 molniyabeer

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Posted 05 September 2006 - 01:56 PM

I have not done a lot of double star observing but last night thought I'd give it a shot to get a "quickie" session in before bed. I decided to look for Chaple's Arc in Cygnus. After a few trips back and forth from the atlas to the eyepiece, I located the set. It is definitely a cool set to observe! While even low power will split all the pairs cleanly, I found it far more interesting that the better know Lyra double-double. Call it the double-double-double! Here is my sketch from last night. The top is a 127mm Mak and 25mm plossl, the bottom is my 9x50 RACI finder.

Clear skies.

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  • 1133271-cropped chaple's arc 4 sep 06.jpg


#2 Daniel W

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Posted 05 September 2006 - 02:12 PM

Very nice! I will have to hunt it down myself.

Dan

#3 Wouter D'hoye

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Posted 05 September 2006 - 03:07 PM

Neat! Will have to put that on my to do list too ;-)

wouter.

#4 Rich (RLTYS)

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Posted 06 September 2006 - 05:13 AM

Molniyabeer

Interseting, can you give us the coordinates for this group?

Thanks and Clear Skies
Rich (RLTYS)

#5 molniyabeer

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Posted 06 September 2006 - 10:49 AM

From "Your Sky" it works out to 20h 5m 45s Dec: +37°58'28" The star numbers are for Cygnus.

There are a lot of doubles in that part of the sky but I believe that what I saw matches the description given in Astronomy (Sept 06) by Glenn Chaple. I'd appreciate it if someone could confirm my sighting (or let me know if I've bunged it all up!).

Clear skies.

#6 chrysalis

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Posted 06 September 2006 - 11:27 AM

I see something in Cartes du Ciel just to the right (east?) of Basel 6 at about those coordinates that looks like the grouping in your picture.

#7 Mark K

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Posted 08 September 2006 - 05:24 AM

From an observing session a month ago:

"Another interesting region was HJ 1470, with four wide doubles in an arc in the same field at 60x. Naturally the doubles tour of Cygnus had to include the glorious Albireo!"

Is this the same arc ?

HJ 1470 is at RA 20:03.7 Dec. +38:20 (2000)


#8 CESDewar

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Posted 08 September 2006 - 08:32 PM

From "Your Sky" it works out to 20h 5m 45s Dec: +37°58'28" There are a lot of doubles in that part of the sky but I believe that what I saw matches the description given in Astronomy (Sept 06) by Glenn Chaple.

Yes, that's definitely what he was talking about. I looked for it tonight in my Saturn III's, and although the opacity was rather high (down here, we talk about opacity, not transparency :grin:) and the full moon was starting to blast away, I was able to catch a quick glimpse. The 10th mag companion of HIP 98848 was barely visible, but the others were readily visible in spite of the lousy viewing conditions - I definitely have to re-visit this under dark skies! At first, I wasted time because I stumbled onto a similar and much brighter arc of 7th mag stars just 11' away from 27 Cygni -- there are two beautiful bright doubles, another star and then another double in an arc. I was thinking maybe the lone star (HIP98999)had a companion that was just a lot dimmer before I realized that I was looking on the wrong "side" of the tail of Cygnus (an easy mistake when switching back and forth between binoculars and a refractor that is reversing the image) - Chaple's arc is about 2° away and comprises much fainter stars. Just browsing around there are LOT of double stars in this region!

#9 chrysalis

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Posted 09 September 2006 - 04:54 PM

For those of us with the Orion Intelliscope and COL, "ST720" is h1470...makes it easy, eh?

#10 Carol L

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Posted 10 September 2006 - 01:16 AM

I wonder if Glenn knows that his 'Chaple's Arc' is actually a portion
of the already well-known 'Cygnus Fairy Ring' :p (try Google).
It's a fairly large asterism (40'x40) which is located a bit
off of the straight line running between Gamma and Eta.

Here's a sketch I did of it on June 2 of this year.
The area has lots of doubles in it.. very charming formation, actually. :D

And here's a screen shot from my Sky Tools program showing the
general location. (Screenshots are permitted as long as the
product's name is mentioned.)

edit.. sorry, forgot to add the screen shot.. here it is

Attached Thumbnails

  • 1141161-cygnus fairy ring.jpg


#11 Rich (RLTYS)

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Posted 16 September 2006 - 10:34 PM

molniyabeer & Carol L

I just came in from observing and spent over an hour observing "Chaples Arc" and the "Cygnus Fairy Ring". Molniyabeer your sketch is quite accurate as the four doubles were easily seen in my 10" Refl at 38x. A couple of other doubles were seen just east of "Chaple's Arc" most likely part of the Cygnus Fairy Ring. I'll most likely post some sort of sketch after I've identified the doubles I've observed.

Clear Skies
Rich (RLTYS)

#12 Rich (RLTYS)

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Posted 18 September 2006 - 05:00 AM

To All

I've been trying to identify the observed doubles in Chaple's Arc and the Cygnus Fairy Ring but without much success. :confused: Has anyone been able to identify these doubles?

Thanks for the help.
Rich (RLTYS)

#13 chrysalis

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Posted 18 September 2006 - 05:31 AM

To All

I've been trying to identify the observed doubles in Chaple's Arc and the Cygnus Fairy Ring but without much success. :confused: Has anyone been able to identify these doubles?

Thanks for the help.
Rich (RLTYS)

It appears h1470 is one of them.

#14 molniyabeer

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Posted 19 September 2006 - 05:52 AM

In his article, Chaple mentions that he was looking for h1470 when he came across the arc. He didn't list formal numbers for any of the others if they have been cataloged elsewhere.

Clear skies.

#15 Carol L

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Posted 19 September 2006 - 01:58 PM

Here's my sketch (righted to north up), labelled with
the doubles found via my Sky Tools program. There's
lots of optical doubles in the area, too.

Hope this helps.

:D

Attached Thumbnails

  • 1155421-doubles in the CYG Fairy Ring.jpg


#16 molniyabeer

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Posted 20 September 2006 - 02:05 PM

Very pretty sketch! I've been trying to go back and revisit this one myself to capture a better rendition (mine is a little off in several spots) but the clouds keep drifing in just as it's getting dark.

Clear(er) skies.

#17 Rich (RLTYS)

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Posted 21 September 2006 - 04:53 AM

Carol L

Thanks for the info, it's a big help.

Clear Skies
Rich (RLTYS)

#18 Carol L

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Posted 21 September 2006 - 10:31 PM

Thanks Steve, and don't worry.. everyone's stars are always a bit off. ;)

You're welcome Rich, it surprised me that most of the doubles were optical
but they're just as pretty anyway. :)


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