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Pages: 1 stevecoe "Astronomical Tourist" Reged: 04/24/04 Loc: Arizona, USA Epsilon Boo in 6" refractor       #3066520 - 04/25/09 03:28 PM Edit   Reply   Quote Quick Reply   Howdy all; I found Epsilon Bootis an interesting double, somewhat difficult to split and fun colors. It is at: 14 45.0 and +27 06, the stars are 2.5 and 5 mag with a 3 arcsec split. 6" f/8 Seeing=7/10 Transparency=8/10 14mm EP bump on primary 50%, blended round 50%. 6.7mm split 60%, elongated 40%, light yellow and light blue-green (aqua) with fair color contrast. The companion is not prominent, but the colors are interesting. Enjoy; Steve Coe Post Extras:       Scott Beith SRF Reged: 11/26/03 Loc: Frederick, MD Re: Epsilon Boo in 6" refractor [Re: stevecoe]       #3067500 - 04/26/09 03:28 AM Edit   Reply   Quote Quick Reply   Steve you are putting that scope to good use. Post Extras:       Bonco Post Laureate Reged: 04/17/06 Loc: Florida Re: Epsilon Boo in 6" refractor [Re: Scott Beith]       #3068593 - 04/26/09 03:25 PM Edit   Reply   Quote Quick Reply   I think a 6 inch might provide the optimal view of this colorful double. However it's doable in much smaller scopes as discussed in another thread here on the doubles forum. Cheers, Bill Post Extras:       Erik Bakker Carpal Tunnel Reged: 08/10/06 Loc: The Netherlands, Europe Re: Epsilon Boo in 6" refractor [Re: Bonco]       #3076498 - 04/30/09 06:50 AM Edit   Reply   Quote Quick Reply   Quote: I think a 6 inch might provide the optimal view of this colorful double. However it's doable in much smaller scopes as discussed in another thread here on the doubles forum. Cheers, Bill It is possible on any night to split in my 55mm f/8 fluorite at 90X, easy in the 70 f/8 fluorite at 120x and absolutely stunning in the 102 f/8.8 fluorite at 180x. As you can see, exit pupils around 0.6mm work well for this double. Clear skies, Erik Post Extras:       KWB Postmaster Reged: 09/30/06 Loc: Westminster,Co Elev.5400 feet Re: Epsilon Boo in 6" refractor [Re: Erik Bakker]       #3078221 - 05/01/09 12:20 AM Edit   Reply   Quote Quick Reply   This is probably my favorite double star,Steve,considering the challenge of a needed steady atmosphere and decent aperture to see it on a fairly consistant,basis,at least in my skies. I too think a 6 incher is about the optimum size to show it's absolutely beautiful color contrast. In my 10 inch scope the colors seem to fade. My favorite scope for double star busting is also a 6 inch F/8,but in reflector form. Cheers, Post Extras:       dvb different Syndrome. Reged: 06/18/05 Loc: Vancouver, Canada Re: Epsilon Boo in 6" refractor [Re: KWB]       #3080011 - 05/01/09 10:25 PM Edit   Reply   Quote Quick Reply   Very pretty last night in my C6 at 150x. But Xi Boo was also very pretty. Post Extras:       Tom and Beth Carpal Tunnel Reged: 01/08/07 Loc: Tucson, AZ Re: Epsilon Boo in 6" refractor [Re: KWB]       #3101067 - 05/12/09 07:49 PM Edit   Reply   Quote Quick Reply   I'd agree with you that a 10 inch scope seems to wash out the color difference as compared to a smaller scope working at the same magnifications. Still one of my favorites. Post Extras:       proud uncle Carpal Tunnel Reged: 01/22/07 Loc: Central Texas Re: Epsilon Boo in 6" refractor [Re: Erik Bakker]       #3104822 - 05/14/09 02:22 PM Edit   Reply   Quote Quick Reply   Quote: As you can see, exit pupils around 0.6mm work well for this double. If this is true, I would need > 400x w/ my 10" Dob. It seems counter-intuitive, considering how consistently it is split with much smaller scopes. I will try it when I get a clear, steady night. Post Extras:       RLTYS Post Laureate Reged: 12/18/04 Loc: New York (Long Island) Re: Epsilon Boo in 6" refractor [Re: proud uncle]       #3106115 - 05/15/09 06:23 AM Edit   Reply   Quote Quick Reply   With my 10" refl, at 253x I see the primary as Pale Yellow and the secondary as Pale Blue. Rich (RLTYS) Post Extras:       KWB Postmaster Reged: 09/30/06 Loc: Westminster,Co Elev.5400 feet Re: Epsilon Boo in 6" refractor [Re: RLTYS]       #3107782 - 05/16/09 01:10 AM Edit   Reply   Quote Quick Reply   I see it the same way with my 10 incher. I prefer seeing more vivid coloration using a smaller scope. Post Extras:       dvb different Syndrome. Reged: 06/18/05 Loc: Vancouver, Canada Re: Epsilon Boo in 6" refractor [Re: proud uncle]       #3111234 - 05/17/09 08:40 PM Edit   Reply   Quote Quick Reply   Quote: Quote: As you can see, exit pupils around 0.6mm work well for this double. If this is true, I would need > 400x w/ my 10" Dob. It seems counter-intuitive, considering how consistently it is split with much smaller scopes. I will try it when I get a clear, steady night. In my 10" f/4.7 Dob, I believe a 7.5mm eyepiece yields an exit pupil of .63mm (4.7/7.5), or 160x. And that did indeed provide a very pleasant split, using both a Tak 7.5 and a Speers-WALER 7.5. Post Extras:       CESDewar GorillAstronomer Reged: 01/16/05 Loc: Blue Ridge, GA, USA Re: Epsilon Boo in 6" refractor [Re: dvb]       #3111439 - 05/17/09 10:47 PM Edit   Reply   Quote Quick Reply   While I have just barely managed to catch this one in my TV-60 (more of an academic excercise than a fine sight!), it really was a beautiful sight in my 127mm APO at 264x (2.5T6) on a night of steady seeing where the pale blue-green of the secondary provided an extraordinary contrast with the primary. Definitely one of the fine sights in the sky... Post Extras:       fred1871 sage Reged: 03/22/09 Loc: Australia Re: Epsilon Boo in 6" refractor [Re: dvb]       #3111602 - 05/18/09 12:52 AM Edit   Reply   Quote Quick Reply   Quote: Quote: Quote: As you can see, exit pupils around 0.6mm work well for this double. If this is true, I would need > 400x w/ my 10" Dob. It seems counter-intuitive, considering how consistently it is split with much smaller scopes. I will try it when I get a clear, steady night. In my 10" f/4.7 Dob, I believe a 7.5mm eyepiece yields an exit pupil of .63mm (4.7/7.5), or 160x. And that did indeed provide a very pleasant split, using both a Tak 7.5 and a Speers-WALER 7.5. If your magnification is 160x, and your telescope has an aperture of 10" (254mm) then your exit pupil will be about 1.6mm, not 0.6mm. You'll get a 1.0mm exit pupil when your magnification equals your aperture, 254x for 254mm. I suspect you got the arithmetic upside down, it's easy to do. Post Extras:       dvb different Syndrome. Reged: 06/18/05 Loc: Vancouver, Canada Re: Epsilon Boo in 6" refractor [Re: fred1871]       #3113103 - 05/18/09 06:45 PM Edit   Reply   Quote Quick Reply   Quote: Quote: Quote: Quote: As you can see, exit pupils around 0.6mm work well for this double. Yup - I divided 4.7 by 7.5, not 7.5 by 4.7! If this is true, I would need > 400x w/ my 10" Dob. It seems counter-intuitive, considering how consistently it is split with much smaller scopes. I will try it when I get a clear, steady night. In my 10" f/4.7 Dob, I believe a 7.5mm eyepiece yields an exit pupil of .63mm (4.7/7.5), or 160x. And that did indeed provide a very pleasant split, using both a Tak 7.5 and a Speers-WALER 7.5. If your magnification is 160x, and your telescope has an aperture of 10" (254mm) then your exit pupil will be about 1.6mm, not 0.6mm. You'll get a 1.0mm exit pupil when your magnification equals your aperture, 254x for 254mm. I suspect you got the arithmetic upside down, it's easy to do. Post Extras:       Starfleet member Reged: 05/26/09 Loc: UK Re: Epsilon Boo in 6" refractor [Re: dvb]       #3132666 - 05/28/09 04:48 PM Edit   Reply   Quote Quick Reply   I love this star for the vividness of the secondary's indigo-blue colour in my 8 inch Skywatcher. I have often wondered if it appeared a deeper shade of blue because of colour contrast next to the yellow primary. Then one day, I let the star drift to the edge of my FOV at 200x magnification. I waited until the yellow primary was just outside the field, leaving just the blue secondary on view all by itself. So then what did I see? The deepness of blue of the secondary star did not change one bit! Much to my pleasant surprise, it stayed just as blue... Edited by Starfleet (05/28/09 04:49 PM) Post Extras:       auriga Pooh-Bah Reged: 03/02/06 Re: Epsilon Boo in 6" refractor [Re: stevecoe]       #3142532 - 06/02/09 09:32 PM Edit   Reply   Quote Quick Reply   Quote: Howdy all; I found Epsilon Bootis an interesting double, somewhat difficult to split and fun colors. It is at: 14 45.0 and +27 06, the stars are 2.5 and 5 mag with a 3 arcsec split. 6" f/8 Seeing=7/10 Transparency=8/10 14mm EP bump on primary 50%, blended round 50%. 6.7mm split 60%, elongated 40%, light yellow and light blue-green (aqua) with fair color contrast. The companion is not prominent, but the colors are interesting. Steve, I have found Izar difficult in small scopes, perplexingly so, so I tried it in an excellent 16" f/4 Dob the other night and it was still difficult. I finally got a clean split with a 5 Nagler plus Paracorr, giving 374x. I didn't notice any color difference or marked magnitude difference, just two white stars, almost equally bright, and almost touching at 374x. I was surprised at how difficult it was to separate it even in such a large optically excellent scope. It was only later that I realized I had set Sky Commander to zeta Boo, separation 0.8, rather than to epsilon, separation 3.0. Two white stars, nearly equal in magnitude. By the way, I like your book, Deep Sky Observing: The Astronomical Tourist. very helpful, good personal observations, with a variety of apertrures, and nice sketches. Good selection of objects, too. Bill Meyers Post Extras:       Dave Mitsky Postmaster Reged: 04/08/02 Loc: PA, USA, Planet Earth Re: Epsilon Boo in 6" refractor [Re: Bonco]       #3142816 - 06/03/09 12:12 AM Edit   Reply   Quote Quick Reply   Quote: I think a 6 inch might provide the optimal view of this colorful double. However it's doable in much smaller scopes as discussed in another thread here on the doubles forum. Cheers, Bill I had a fine view of Izar (or Mirach or Pulcherima) on Saturday night with my 101mm Tele Vue refractor. Dave Mitsky Post Extras:       Pages: 1

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