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AjithSeattle
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Reged: 04/20/13

Your favorite double stars to observe
      #5946400 - 06/29/13 11:27 AM

Last night, after three patient days of waiting for a chance to get to my telescope, I found a few hours where part of the northeast and eastern night sky was clear enough to setup my scope.

While it was not technically a "first light" for my Orion XT8i, it was the first time I used the 2-star align. After my first alignment attempt with Vega as the first star and Deneb as the second star yielded a warp factor of +3.5, I tried again. Altair was still behind the trees and I live in an neighborhood with lot of street lights and one shining directly at me in close proximity in the direction of tree-obscured Altair.

For the second attempt, I chose Vega again for the first star alignment and Polaris for the second alignment and this worked out great. It yielded a warp factor of -0.3 on the object locator. After I had this setup, I looked closely at polaris for the first time. It is a double! I'm sure all of you know it was a double and a cepheid variable but I didn't last night and it pleasantly surprised me. First, I thought I was miscategorizing some other stellar entity for Polaris, so I went to a narrow FOV with 4mm Plossl and large magnification. The idea was that it would drift away from my observational view like Vega did if it is not Polaris. After 5-10 minutes of leaving the scope as it while I digged around the Stellarium for RA/Dec and Alt/Az for Polaris for my vantage point,the field didn't change, it was dead center in the field. I also have a Wixey mounted on my XT8i and it showed good alignment with altitude with the Stellarium program.

Now, I read yesterday night that Polaris is actually a triple and not a double - apparently while the faint companion seen in 8" scope is the first one discovered by Herschel in 1780, there is another fainter white dwarf that was spectroscopically identified in 1929 and visually confirmed in 2006 (see this excellent write up - http://simostronomy.blogspot.com/2008/07/polaris.html).

I've been officially bitten by the double bug

Has anyone observed the third alpha UMi Ab?
If you had to pick top 5 double stars most interesting and exciting to observe, what would they be?

Cheers,
Ajith


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REC
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Re: Your favorite double stars to observe new [Re: AjithSeattle]
      #5946436 - 06/29/13 11:49 AM

Good for you, ton's of double stars out there to investigate!

Time for you to track down the most famous of them all, Alberio in Cygnus and the double double in Cygnus!

Welcome to Cloudy Nights!

Bob


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obin robinson
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Re: Your favorite double stars to observe new [Re: AjithSeattle]
      #5946478 - 06/29/13 12:15 PM

I am always mesmerized by Albireo.

http://apod.nasa.gov/apod/ap050830.html

obin


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Kfrank
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Re: Your favorite double stars to observe new [Re: REC]
      #5946492 - 06/29/13 12:21 PM

Quote:

Good for you, ton's of double stars out there to investigate!

Time for you to track down the most famous of them all, Alberio in Cygnus and the double double in Cygnus!

Welcome to Cloudy Nights!

Bob




Both excellent choices - but isn't the Double Double in Lyra?

Also check out Mizar in Ursa Major.


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desertlens
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Re: Your favorite double stars to observe new [Re: Kfrank]
      #5946519 - 06/29/13 12:44 PM

You'll need to wait a bit but check out sigma Orionis, a quadruple. Nearby is a nice double, Struve 762. I was surprised at the appeal of doubles. Clear skies and good hunting.

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MikeBOKC
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Re: Your favorite double stars to observe new [Re: AjithSeattle]
      #5946551 - 06/29/13 01:06 PM

Put Beta Monoceros on your winter list - the nicest triple star system in the sky.

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kfiscus
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Re: Your favorite double stars to observe new [Re: MikeBOKC]
      #5946674 - 06/29/13 02:24 PM

52 Cygni. I guess it's a triple. The reason I call it "my favorite star" is that it marks the location of the Veil Nebula. I have to get a really good night to try to separate the members. If I remember correctly, the star(s) aren't related to the nebula.

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Kon Dealer
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Re: Your favorite double stars to observe new [Re: kfiscus]
      #5946741 - 06/29/13 03:07 PM

Izar (E. Bootes) is my personal favourite.

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S.Boerner
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Re: Your favorite double stars to observe new [Re: Kon Dealer]
      #5946779 - 06/29/13 03:29 PM

Give the Trapezium in Orion a shot.

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Kraus
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Re: Your favorite double stars to observe new [Re: S.Boerner]
      #5946948 - 06/29/13 05:36 PM


I'm partial to Izar and Alibero and sigma Orionis. I saw five stars quite easily in sigma Orionis. A sixth star tried to peek out at me.


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StarStuff1
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Re: Your favorite double stars to observe new [Re: Kraus]
      #5946974 - 06/29/13 05:58 PM

Next to Alberio the most beautiful double in the northern hemisphere is gamma andromadae. IMHO.

But one of the most unusual "multiple" star systems is H3780 in Lepus. This might just be a very sparse open cluster but it is very attractive in small scopes and often overlooked by better known targets. Well worth finding this coming Winter.


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JIMZ7
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Re: Your favorite double stars to observe new [Re: StarStuff1]
      #5946988 - 06/29/13 06:06 PM

I second that for Albireo & Gamma Andromeda as my favorite double stars.

Jim


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Bakes
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Re: Your favorite double stars to observe new [Re: JIMZ7]
      #5947258 - 06/29/13 10:15 PM

I'll also vote for Albireo, an old favorite. Alpha Herculis is a close split with nice color contrasts. Castor in the Winter. Mizar itself(not Alcor) splits nicely even in my first 50mm scope. Finally, for the fifth selection, Polaris. It's up all night all year for most of us.

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karstenkoch
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Re: Your favorite double stars to observe new [Re: JIMZ7]
      #5947266 - 06/29/13 10:21 PM

Scorpius is putting on a good show this time of year in the southern sky for us northern hemisphere observers. Check out Graffias (beta scorpii) for a nice easy bright uneven double. It's the brightest star in the "top" arm of the scorpion. 1 1/2 degrees away is Jabbah (nu scorpii), another relatively bright and pretty uneven double. There's plenty more in the area. If you can, I recommend that you get a decent star altas that shows doubles such as the Cambridge Double Star Atlas to plan your nighttime hunts during the day. Clear skies, Karsten

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Perigny270
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Re: Your favorite double stars to observe new [Re: Bakes]
      #5947271 - 06/29/13 10:26 PM

Many of my favourites have already been mentioned. But I must admit that I look for Antares every chance I get. Nice colour even if the split is difficult - it's a challenge well worth the effort.

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fred1871
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Re: Your favorite double stars to observe new [Re: karstenkoch]
      #5947295 - 06/29/13 10:58 PM

Nu Scorpii (mentioned above as a wide double) is worth looking at - an easy wide pair at low power, but it's also a "double-double" because each star is a close pair. The brighter star is quite close (~1.3") and somewhat uneven - for northern observers it'll be a matter of steady air to show it; the lesser star is an easier, somewhat wider pair (2.4").

In okay seeing all four will show with a 6-inch Newtonian, not as easy as the Epsilon Lyrae "double-double", but still very nice.


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Nucleophile
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Re: Your favorite double stars to observe new [Re: fred1871]
      #5947338 - 06/29/13 11:37 PM

Cor Caroli is one of my favorites.
But I'll always look at Izar, Albireo, Almach, Trapezium and Antares given a chance.

Rigel, also, is quite beautiful in a simple way.
The double star function of your XT8i is a great way to get introduced to doubles.

I remember being *very impressed* that I could split an even double of 0.9 arcseconds when I first got that instrument--and now I work with it down near the Dawes Limit! What a sturdy, portable, powerful and ergonomic telescope--I'll never part with mine.


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ziridava
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Re: Your favorite double stars to observe new [Re: Nucleophile]
      #5947683 - 06/30/13 08:47 AM

Why not add Porrima as a Spring favorite and 52 Ori as a Winter favorite.
Then,I'm in big trouble, there are so many beautiful double stars in the sky that I must admit I'm a polygamist in this matter.
All are beautiful in their own way ! I want them all!

Mircea


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gfeulner
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Re: Your favorite double stars to observe new [Re: AjithSeattle]
      #5947793 - 06/30/13 10:13 AM

I know the title is "favorite doubles" but I love triples. Beta Monoceros, Zeta Cancri and Iota Cassiopia among my favorites. Gerry

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StarStuff1
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Re: Your favorite double stars to observe new [Re: gfeulner]
      #5947877 - 06/30/13 11:21 AM

Wow, I can't believe no one has mentioned Algieba, gamma leonis. One of my favorite double star experiences was viewing it through holes in the clouds and a light rain falling. With an 80mm refractor it was simply stunning, yellow-green!

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AjithSeattle
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Re: Your favorite double stars to observe new [Re: Nucleophile]
      #5948939 - 07/01/13 12:23 AM

Albireo is impressive - the contrasting colors sure make this viewing experience memorable. I just saw it yesterday night, loved it!

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Astrodj
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Re: Your favorite double stars to observe new [Re: AjithSeattle]
      #5948986 - 07/01/13 01:43 AM

One of my faves for this time of year is Rho Ophiuchus. It's about 3 degrees north of Antares in Scorpius. Check it out.

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AjithSeattle
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Re: Your favorite double stars to observe new [Re: Astrodj]
      #5949389 - 07/01/13 10:19 AM

Last night I observed the double-double in Lyra - With my 8" XT8i, I could split the closer double to reveal the individual stars only at large magnification (300x) XT8 has focal length of 1200mm and I used a 4mm Plossl EP to split it.

Then, it was Mizar, again I could spot the Mizar-Alcor but the close double on the Mizar itself, it couldn't be resolved further than a oblong point of light.

Izar (E.Bootes) - I couldn't split it with my scope, I'm sure I'm doing something wrong, it showed up as a orange-yellow point of light but didn't see the bluish companion. I'm doing to try again in the next opportunity I have.

So many more options to look at from all of you, thank you for that.


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Nucleophile
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Re: Your favorite double stars to observe new [Re: AjithSeattle]
      #5949466 - 07/01/13 11:03 AM

Quote:

Last night I observed the double-double in Lyra - With my 8" XT8i, I could split the closer double to reveal the individual stars only at large magnification (300x) XT8 has focal length of 1200mm and I used a 4mm Plossl EP to split it.

Then, it was Mizar, again I could spot the Mizar-Alcor but the close double on the Mizar itself, it couldn't be resolved further than a oblong point of light.

Izar (E.Bootes) - I couldn't split it with my scope, I'm sure I'm doing something wrong, it showed up as a orange-yellow point of light but didn't see the bluish companion. I'm doing to try again in the next opportunity I have.

So many more options to look at from all of you, thank you for that.




All of those should be easy splits---collimation errors is my guess ( and/or possibly tube currents + improper mirror cool down).

Of course, it could be the mirror also---these are mass produced in China. However, this is usually not the first place to look.

You may wish to spend some time in the reflector forum to learn more about this instrument ( and the fine art of collimation)----many of us have these 8 inch Orion reflectors and the archives are a treasure chest of helpful info. Above all, be patient and get to know the instrument each opportunity you can


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phily
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Re: Your favorite double stars to observe new [Re: StarStuff1]
      #5949881 - 07/01/13 03:20 PM

I agree with the choice of Albireo, which I think is one of the most beautiful objects in the sky, also Almach. For interest, however, how about Castor?
Phil


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exparrot
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Re: Your favorite double stars to observe new [Re: phily]
      #5950581 - 07/01/13 11:39 PM

Xi Sco, especially the challenging AB pair

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Dave Mitsky
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Re: Your favorite double stars to observe new [Re: desertlens]
      #5950739 - 07/02/13 03:28 AM

Quote:

You'll need to wait a bit but check out sigma Orionis, a quadruple. Nearby is a nice double, Struve 762. I was surprised at the appeal of doubles. Clear skies and good hunting.




Actually, the quintuple star Sigma Orionis is Struve 762. Struve 761 is the nearby triple star.

http://www.perezmedia.net/beltofvenus/archives/000344.html

http://www.skyandtelescope.com/observing/objects/doublestars/3309846.html?pag...

Dave Mitsky


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Dave Mitsky
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Re: Your favorite double stars to observe new [Re: StarStuff1]
      #5950752 - 07/02/13 03:47 AM

Quote:

Wow, I can't believe no one has mentioned Algieba, gamma leonis. One of my favorite double star experiences was viewing it through holes in the clouds and a light rain falling. With an 80mm refractor it was simply stunning, yellow-green!




In addition to Gamma Andromedae and Gamma Leonis, two noteworthy "gamma" doubles are Gamma Delphini and Gamma Arietis. Gamma Velorum is a fine multiple star.

Iota Cancri is a colorful springtime double. The Winter Albireo, h3945, is another very colorful binary star.

One of my very favorites, however, is Struve 2470/2474 in Lyra, the so-called Other Double Double.

http://bestdoubles.wordpress.com/2010/06/25/struve-2470-and-struve-2474-the-o...

Dave Mitsky


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azure1961p
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Re: Your favorite double stars to observe new [Re: StarStuff1]
      #5951002 - 07/02/13 09:48 AM

Wow - for every season there's at least a handful. For summer:

61 Cygni
Albireo
Delta Cygni
Trifid Multiple
Zeta Herculi
Epsilon Lyra
Double-Double-Double in Lyra
Es244 in Cygnus
2EsVulpeculi

There's more but that's what comes to mind.

Pete


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PJ AnwayModerator
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Re: Your favorite double stars to observe new [Re: AjithSeattle]
      #5952255 - 07/02/13 11:07 PM

Zeta Aquarii is my favorite; always enjoy observing it.

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Ziggy943
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Re: Your favorite double stars to observe new [Re: PJ Anway]
      #5956498 - 07/05/13 06:08 PM Attachment (24 downloads)

Epsilon Lyrae

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rookie
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Re: Your favorite double stars to observe new [Re: Ziggy943]
      #5959018 - 07/07/13 02:13 PM

My favorite is Gamma Velorum. Its multiple star system is symmetrical and looks like a dragonfly.
WZ Cas is a lovely red-blue
Es244 Past Thread Link
STF 1659 is the Stargate cluster in Corvus

Edited by rookie (07/08/13 10:36 PM)


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Ben Therrell
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Re: Your favorite double stars to observe new [Re: rookie]
      #5959048 - 07/07/13 02:36 PM

I always give Polaris a close look. If you can see the companion at low power then you know it's going to be a good night.

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ggalilei
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Correction new [Re: Ben Therrell]
      #5971628 - 07/15/13 03:18 AM

I stayed up late and caught an off season view of beautiful sigma (oops: ETA!) Cassiopeiae: easy to split and interesting color contrast: bright pale yellow and dim red.
Another pretty "gamma" is Porrima, in Virgo: it used to be a difficult split, but now the separation is wider and 100x or so will split it.

Edited by ggalilei (07/16/13 05:47 PM)


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OJS
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Re: Your favorite double stars to observe new [Re: ggalilei]
      #5974466 - 07/16/13 04:00 PM

Years ago a music reviewer said that his favorite Haydn string quartet was the last one he listened to. My favorite double star is the last one I've seen thru the telescope. Paul Couteau said (paraphrasing): "The sight of a [any] double star through a telescope never leaves you indifferent"

OJS


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Tyranthrax
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Re: Your favorite double stars to observe new [Re: OJS]
      #5974509 - 07/16/13 04:18 PM

My first was polaris, I was amazed when I saw my first with my own eyes. then I saw iota cancre, loved it but couldn't get a good photo becuase I sucked at it then. But rounding out the blue/yellow is Albireo.

I got a great picture of it, one of my best. The colors is what I like about it. I had a good friend as a kid who always wore the two colors together so when I see the colors together it brings be back to a godo place in time. thus tehy hold a special place for me. like th good memory is cemented in teh heavens. The pic I got was only adjustd levels and curves the colors are what I take pride in trying to capture the exact color with out adding to it or taking away. that is my drink of choice. It has to be true to the object and do it justic. My pic is in my gallry but in the thread in this corner. (I am taking note of the ones mentioned I want to get a double and tripple collection going.)
http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/5963170/page...


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Messyone
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Re: Your favorite double stars to observe new [Re: Tyranthrax]
      #5975444 - 07/17/13 04:04 AM

Rigel for me. Easy to show others who are amazed at the size, (that is the brightness) difference between the two.

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ggalilei
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Re: Your favorite double stars to observe new [Re: Messyone]
      #5975872 - 07/17/13 12:18 PM

In winter time, an easy and great looking triplet is Alnitak (zeta Orionis), leftmost in the belt.

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ggalilei
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Re: Your favorite double stars to observe new [Re: ggalilei]
      #5975889 - 07/17/13 12:24 PM

... and the easiest way to catch a white dwarf: 40 Eridani, easy to locate and view, near Orion. The mag 9.5 star in that triplet is a white dwarf, way easier to see than the "pup" Sirius B!

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Starman81
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Re: Your favorite double stars to observe new [Re: PJ Anway]
      #6098981 - 09/24/13 05:39 PM

Quote:

Zeta Aquarii is my favorite; always enjoy observing it.




I just bagged this one yesterday! Nice, tight pair, both looked white to me at 150x (XW 20 + TV PM 2.5x) in the XT8g. Classic '8' shape, riding each other's diffraction rings! The seeing was very good and the scope was well cooled down, I might add. Upping the power to 300x+ (Nagler Zoom @4mm), they looked like a light yellow, equal pair, with a bit more separation.


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azure1961p
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Re: Your favorite double stars to observe new [Re: Starman81]
      #6099374 - 09/24/13 09:36 PM

My current fav is alpha Herculis. Nice coppery peaches and cream and plenty easy and brilliant at 70x.

Pete


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Natty Bumppo
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Reged: 08/30/13

Re: Your favorite double stars to observe new [Re: azure1961p]
      #6099460 - 09/24/13 10:38 PM

Favorite summer double - Albireo
Favorite winter double - WZ Cas


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Bill Boublitz
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Re: Your favorite double stars to observe new [Re: Natty Bumppo]
      #6100124 - 09/25/13 11:00 AM

Favorite Double Star? The last one I resolved.

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george golitzin
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Re: Your favorite double stars to observe new [Re: Bill Boublitz]
      #6100597 - 09/25/13 02:55 PM

Quote:

Favorite Double Star? The last one I resolved.




Bingo! For me, that's lambda Cygni--beautiful 0.9 arcsecond split at 490X in my 12.5. Secondary basically due north of primary. (But I love all the ones mentioned above as well.)

-geo


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Kon Dealer
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Re: Your favorite double stars to observe new [Re: george golitzin]
      #6100618 - 09/25/13 03:05 PM

Now Izar is below the trees, Almach is my favourite.
As it is a closer double than Albireo and with similar colours, think the contrast is more striking.


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