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blb
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Reged: 11/25/05

Loc: Piedmont NC
Re: Rigel split new [Re: rwiederrich]
      #5002881 - 01/05/12 04:01 PM

Quote:

This is the image I took back in 06....

I might be wrong but I'm sure there are 3 stars in this system. I cropped the image to improve the image scale.




Would you be so kind as to label the A, B and C components in this system on your photograph, keeping in mind there Position Angle and seperations. If I assume that the closest star is B, then D isn't in the picture.


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Bonco
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Reged: 04/17/06

Loc: Florida
Re: Rigel split new [Re: blb]
      #5002938 - 01/05/12 04:34 PM

Checked 3 other references that indicate Rigel has only one visual companion. Recent observations seem to discount the early on observations of "B" being viewed as a tight .1" double.
Bill


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azure1961p
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Reged: 01/17/09

Loc: USA
Re: Rigel split new [Re: rwiederrich]
      #5003206 - 01/05/12 07:48 PM

You didnt image the 0.1" . Field star fill ins.

Itd be amazing to even a see an elongation. Nice shot though. Revealing.

Pete

Edited by azure1961p (01/05/12 08:15 PM)


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rwiederrich
Goldfinger
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Reged: 11/17/05

Loc: Always Dark skies of Belfair W...
Re: Rigel split new [Re: Bonco]
      #5004296 - 01/06/12 01:42 PM

AFTER further analysis..I concluded I posted the wrong image of Rigel...SORRY. I'm sure I caused confusion(I'm confused).

I'll search my images for it.

Rob


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archer1960
sage


Reged: 07/26/11

Re: Rigel split new [Re: rwiederrich]
      #5005296 - 01/07/12 08:40 AM

There are 3 stars, but Rigel B is far too close to split. If you're seeing more than that in your image, then one of them is a foreground or background star, and not part of the system.

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piyro
member


Reged: 05/14/10

Loc: Canary Islands, Spain
Re: Rigel split new [Re: rwiederrich]
      #5006780 - 01/08/12 07:36 AM

Last night, with my new Vixen A70 Lf (70 mm f/13, but I was using it at 50 mm f/18) at 72x

Pedro.


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mseay
newbie


Reged: 11/25/11

Re: Rigel split new [Re: Javier]
      #5036615 - 01/25/12 06:39 AM

Hey, Javier, what kind of setup and magnification were you using? I've been trying to split Rigel lately and am not sure if I need to go lower or higher...

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piyro
member


Reged: 05/14/10

Loc: Canary Islands, Spain
Re: Rigel split new [Re: mseay]
      #5036633 - 01/25/12 07:18 AM

Probably it is because of my location, by the sea in a medium town at 28 degrees north, but once I splitted Rigel for the first time, I have splitted it most nights. Last night, for example, at 36x, although I should recognize that was easier at 45x.

Pedro.


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Starman81
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Reged: 03/06/08

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Re: Rigel split new [Re: rwiederrich]
      #5543664 - 11/28/12 11:16 AM

I was viewing Jupiter and the moon through clouds last night and pointed the dob at the Rigel to star test my recent collimation. I was first-lighting a new-to-me 12mm Nagler T4 and had a 2x barlow with it in the focuser (200x). I was pleasantly surprised to find the unexpected companion (unexpected since I didn't know Rigel was a double and I was not trying to split it). A nice sight! I see from this thread that if I was aiming to split it cleanly I could use less power.

Side note: I put in the 12mm UO HD Ortho + 2x shorty barlow for the same 200x and noted that companion was brighter and easier to see. Not a surprise to most, I'm sure, but to me it was.


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mikey cee
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Reged: 01/18/07

Loc: bellevue ne.
Re: Rigel split new [Re: Starman81]
      #5544810 - 11/28/12 11:24 PM

Hey Rob ol' boy that looks like an over exposed Jupiter and moons! Mike

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Kon Dealer
professor emeritus


Reged: 01/05/11

Loc: Cambridge UK
Re: Rigel split [Re: mikey cee]
      #5545349 - 11/29/12 11:16 AM

Had a go last night after watching Ganymede transiting
Didn't expect much with all the glare from a full Moon and a milky sky, but it was a noticeable split at x87 and really clear at x122 (Kson102ED).


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WRAK
Pooh-Bah


Reged: 02/18/12

Loc: Vienna, Austria, Europe
Re: Rigel split new [Re: Kon Dealer]
      #5619509 - 01/12/13 05:37 PM

Last night I had the opportunity to have a look at Rigel with my 140mm refractor. The glare of the primary was too intense to see the companion, for resolution it was necessary to reduce the aperture with a mask to 70mm - then the secondary was still rather faint for a +6.8mag star but clearly and stable to see.
Wilfried


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Cotts
Just Wondering
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Reged: 10/10/05

Loc: Toronto, Ontario
Re: Rigel split new [Re: Bonco]
      #5619721 - 01/12/13 07:41 PM

Quote:

Checked 3 other references that indicate Rigel has only one visual companion. Recent observations seem to discount the early on observations of "B" being viewed as a tight .1" double.
Bill




From Wiki: Rigel B is itself a spectroscopic binary system, consisting of two main sequence stars that orbit their center of gravity every 9.8 days. The stars both belong to the spectral class B9V; Rigel B is the more massive of the pair, at 2.5 versus 1.9 solar masses.[18][19]
There was long-running controversy in the late 19th and early 20th century over the possible visible binarity of Rigel B. A number of experienced observers claimed to see it as a double, while others were unable to confirm it; indeed, the proponents themselves were sometimes unable to duplicate their results. Observations since have ruled out the likelihood of a visible companion to Rigel B.[18][19]

The scoop from the WDS:

05145-0812STF 668A,BC 1822 2011 117 201 204 8.9 9.3 0.3 6.8
05145-0812BU 555AD 1878 2008 6 2 1 44.5 44.6 0.3 15.4
05145-0812BU 555BC 1878 2005 25 55 30 0.3 0.1 7.5 7.6

Contradictory, it seems.... A spectroscopic binary with an orbital period of 9.8 days at the distance of Rigel (hundreds of light years) would not have a separation of 0.1" - more like 0.0001" or even closer...... I wonder what the WDS BC pair refers to or if it is an erroneous listing......

Dave


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fred1871
scholastic sledgehammer


Reged: 03/22/09

Loc: Australia
Re: Rigel split new [Re: Cotts]
      #5620016 - 01/12/13 11:32 PM

Dave, the BC data line indicates 25 measures between 1878 and 2005. Many of these (18) are listed by SW Burnham in his 1900 catalog of his own discoveries. It is of course the obvious companion as a double. What's interesting here is the 2005 measure - without having the full WDS data we don't know if this is a speckle measure, as seems likely, given the 0.1" separation.

Curious, given as you say that a visible companion to Rigel B is unlikely. Agreed, it can't be the spectroscopic pair. Perhaps the 2005 measure might be evidence for the reality of Rigel B as a visual double after all.


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Michael Morris
Member
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Reged: 01/05/05

Loc: Worcestershire, UK
Re: Rigel split new [Re: fred1871]
      #5642142 - 01/25/13 09:02 AM

Just observed Rigel for the first time. Easily seen with 8" LX200 Classic. Clear in both 13mm Type 6 Nagler and in University Optics 7mm orthoscopic. Nice steady, clearly define airey disc on primary. Companion seen a bright, sharp pin-star about same diameter as Airey disc again away to the south. Lovely.

Edited by RLTYS (01/26/13 05:59 AM)


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EdZ
Professor EdZ
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Reged: 02/15/02

Loc: Cumberland, R I , USA42N71.4W
Re: Rigel split new [Re: Michael Morris]
      #5648969 - 01/28/13 06:53 PM

Rigel was an immediate split for me last week in my AT111 at 50x. Several other first timers at an outreach event also saw it.

edz


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JIMZ7
Pooh-Bah
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Reged: 10/22/05

Loc: S.E.Michigan near DTW
Re: Rigel split new [Re: EdZ]
      #5682526 - 02/15/13 10:54 PM

The other day it was sunny allday,but shortly as it got dark the clouds came rolling in. With my new used 10" scope I got a chance to look at Rigel at 57x. The spikes of the reflector actually looked pretty neat with the secondary star nearby. For the past 6 years I have been using refractor scopes to observe double stars & Rigel was one of those most viewed. What a difference without false colors! The night was getting worse fast so I tried 135x on Rigel. It was useless-very mushy looking so I called it a night even though it was very early evening. You can bet the next clear evening I will split Rigel once again.

Jim


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