Re: Einstein's cross

Here's a drawing by Bertrand Laville, using a 25" Obsession:

http://www.deepsky-drawings.com/q-22370305

The text mentions that 3 components were seen, the 4th one being only
suspected at times.

I've read comments by a few very experienced observers seeing all 4
components with a 30" scope at 8000 ft in the French alps (NELM 7, excellent
seeing)

Cheers!
Julien

On Mon, Feb 8, 2010 at 11:12 AM, Alvin Huey <alvin.huey@No-Spam> wrote:

> I've observed the double quasar several times with my 22" and it was pretty
> easy given a steady night. It was better at Lassen and IHOP.
>
> I observed it with Shneor and Gregg at Blue Canyon...to give you an idea
> that it can be doable under 6.2 skies. Key = steady skies
>
> I've observed it using Kennedy's 28" f/3.66 reflector at SSP 2006 while it
> was about 20 degree above the NW horizon. It looked like a faint direct
> vision double star.
>
> I do have several other lensed objects in one of my pdf's (Selected Galaxy
> Trios) on my website. I know it has nothing to do with it, but just stuck
> it at the end of that document.
>
> As far as I know it...no one has observed all four lensed points of light
> simultaneuosly using any telescope, including Jimi's 48". I've seen two of
> the four with my 22"...then the other two. The two brighter ones are far
> easier than the other two. I don't remember which ones off the top of my
> head.
>
> Alvin
>
> --- On *Mon, 2/8/10, Shneor Sherman <szsherm@No-Spam>* wrote:
>
>
> From: Shneor Sherman <szsherm@No-Spam>
>
> Subject: Re: [TAC] Einstein's cross
> To: "TAC mailing list" <tac@No-Spam>
> Date: Monday, February 8, 2010, 10:45 AM
>
>
> I've observed the Double Quasar at Blue Canyon, in Alvin Huey's 22" and
> Gregg Blandin's 25", on the same night. In Gregg's scope, you could see both
> images, which were grayish and constantly visible. In Alvin's scope, they
> were blue, but were in and out of view in sync. That was maybe 12 or 13
> years ago. I've since observed them at Shingletown (RIP) in my 22". It does
> take a very good night.
> Clears,
> Shneor Sherman
>
> --- On *Sun, 2/7/10, Steve Gottlieb <astrogottlieb@No-Spam>* wrote:
>
>
> From: Steve Gottlieb <astrogottlieb@No-Spam>
> Subject: Re: [TAC] Einstein's cross
> To: "TAC mailing list" <tac@No-Spam>
> Date: Sunday, February 7, 2010, 11:43 AM
>
> On Feb 7, 2010, at 9:51 AM, Julien Lecomte wrote:
>
> > So it looks like, under the right conditions, an experienced observer
> > can visually see it as a non-stellar object, not quite round, with a
> > scope in the 14" range. I might give it a try this fall with my
> > (hopefully ready by then) 16" scope. Has anybody on this list ever
> > been able to see it as 4 clearly separated components?
>
> Here are the individual V magnitudes for the components: 17.4, 17.4, 18.4,
> 18.7
>
> But keep in mind all 4 components fit in a circle just 2 arcseconds in
> diameter. In other words, cleanly resolving all 4 components is equivalent
> to trying to resolve four mag 17.4-18.7 stars in a smaller space than one
> pair of the Double-Double!
>
> A much easier lensed quasar to try and resolve (but still very difficult!)
> is the Double Quasar in Ursa Major near NGC 3079. The individual components
> are V = 16.4 and 16.8 and the separation is 6". I've only seen it as a
> single faint "star" in an 18-inch, but some observers have split it (usually
> in a larger scope).
>
> Steve
> --
> Who's observing/imaging where? http://observers.org/OI-calendar/
> GSSP is coming, July 10-14 http://www.goldenstatestarparty.org
> TAC's imaging mailing list: http://groups.yahoo.com/group/TAC-Imaging/
>
>
>
> -----Inline Attachment Follows-----
>
>
> --
> Who's observing/imaging where? http://observers.org/OI-calendar/
> GSSP is coming, July 10-14 http://www.goldenstatestarparty.org
> TAC's imaging mailing list: http://groups.yahoo.com/group/TAC-Imaging/
>
>
> --
> Who's observing/imaging where? http://observers.org/OI-calendar/
> GSSP is coming, July 10-14 http://www.goldenstatestarparty.org
> TAC's imaging mailing list: http://groups.yahoo.com/group/TAC-Imaging/
>
>

-- 
Who's observing/imaging where? http://observers.org/OI-calendar/
GSSP is coming, July 10-14 http://www.goldenstatestarparty.org
TAC's imaging mailing list: http://groups.yahoo.com/group/TAC-Imaging/