Struve 1965, Zeta Corona Borealis

 
Luis Balanzino
Star: Struve 1965, Zeta Corona Borealis
Date & Time: May 9-10, 2003, 21h to 0h UT 
Seeing: 6 <1-10 Seeing Scale (10 best)>. 
Transparency: 6 <1 worst - 10 best> 
Location of site: Göteborg, Sweden
57°43' N, 11°58' E 
Site classification: Urban area with
considerable light pollution 
Temperature: 10º C
Sky darkness: 4 <Limiting magnitude> 
Moon: In Leo, illuminated fraction 0,54
Telescope: Meade ETX-90 Maksutov 
(90mm f/13.8) on photo tripod
Eyepieces: 25mm and 12,5mm TAL Plossl,
15mm TAL Kellner, 2x TAL Barlow 
Magnification: 50x, 83x, 100x, 166x
 		 Beautiful and bright double, the components look white bluish or 
slightly greenish. Yet split at 50x, the view is more comfortable at 
83x and 100x. 
 
 




 

 
Tim Leese
Star: Struve 1965, Zeta Corona Borealis
Date & Time: 11 May 2003. 00:15UT.
Seeing: 5/6 <1-10 Seeing Scale (10 best)>. 
Transparency:  <1 worst - 10 best> 
Location of site: Northwich, Cheshire. UK.
53° 15' N -2º 33' W
Site classification: Suburban
Temperature: 
Sky darkness: 3.0 UMi <Limiting magnitude> 
Conditions: Moon, quite bright in a clear, if unsteady, sky.
Telescope: 200mm f/6 Newtonian reflector.
Mount:  Vixen GP.
Eyepieces: 18mm, 9mm, 6mm Orthoscopics
Magnification: X67, X133, X200
 		 9mmOr--------Having fine-tuned my setting circles on 39Boo I soon found this double off the latest list. Even in the poor seeing, I separated this pair of pale yellow and bluish stars.  The PA of the companion was estimated to be at 300deg.  I could see only a few faint stars in the same, unsteady,  fov.18mmOr + apodising screen-------- This gave a slightly more 
interesting view, improved by using an apodising screen. This view was pleasing to the eye, a nice double which I hadn't observed before.

Ambience:
At this time of the morning, most of the local lights are off and most people have retired to bed. I can hear some of the creatures of the night (small ones) stirring and rustling about in the hedgerows. The resident owl is perched in his/her oak tree and must wonder what 
all the commotion is about as I stumble about in the darkness. Strangely, I can hear a cuckoo calling in the distance. Hmm, must look into this.

 

 
Steve Bodin 
Star: Struve 1965, Zeta Corona Borealis
Date & Time: 8 and 10 May 2003 11 pm to 1 am
Seeing: 3/10 on 8 May 6/10 on 10 May
<1-10 Seeing Scale (10 best)>. 
Transparency: poor
Location of site: Silverdale WA, USA
47N 123W
Site classification: suburb-rural
Conditions: temp 40F, damp
Sky darkness: 4.5 due  moon <Limiting magnitude> 
Telescope: Celestron C8
Eyepieces: not used
Additional: DX-8263SL video camera at prime focus and 3x
Magnification: app. 333x, 1000x		 Another nice double in CrB for the average scope. Nice and bright blue-white stars that are an easy separation. Viewed on the 8th in poor air at both prime focus and 3x magnification. Average of both data: 6.6 sec at 305.6 deg PA.









 

 
Bob Hogeveen
Star: Struve 1965, Zeta Corona Borealis
Date & Time: 28 May 2003
Seeing: 7 <1-10 Seeing Scale (10 best)>
Transparency: fair degrading to poor in lower sky
Location of site: Annen, The Netherlands
53ºN, 6ºE
Site classification: Rural with some light domes
Sky darkness: 5 <Limiting magnitude>
Transparency:  <1 worst - 10 best>
Conditions: temp 10 C, damp 
Telescope: C11 on G11
Eyepieces: Pentax SMC XL 40mm, 
Ultima 30mm, TV plossl 20mm, plossl 10mm, LV 5mm
Magnification: 19x, 70x
 
 

 

 A beautiful bright and easy double, a showpiece for small scopes and low power. With my finderscope (Guan Shengg 80mm f/6) at 19x Zeta is split and its neighbour Struve 1973 can be seen in the same FOV.

With the C11 at 70x Zeta shows as two bright white stars, a pretty sight. Note: Skymap shows both stars as blue.
Rating: 2

 

 
Eddy  O'connor
Star: Struve 1965, Zeta Corona Borealis
Date & Time: May 30th 2003. 
10.30 - 11.30 p.m local; UT +10
Seeing: 6 <1-10 Seeing Scale (10 best)>. 
Transparency: 8 <1 worst - 10 best> 
Location of site: Terara, New South Wales,
Australia, Long.150º.38 ; Dec. S 34º.52
Site classification: 
Temperature: 14ºC
Sky darkness:  <Limiting magnitude> 
Conditions: High humidity. No Moon
Telescope: 8" Newt. F9
Eyepieces: 25mm K, 12.5 mm Ortho
Magnification: 
Harshaw Scale: 1 <1-5: 1 best>		 Zeta CrB. Mag. 4.6/5.6; Sep. 6.1". This I list as the Navel Destroyer and sits 18º above my cluttered Northern horizon. I have kept this one for last as it comes with a three star 
chiropractic warning. I eventually find it after some manoeuvring just above the ripening oranges in my neighbour's front garden. A fruit-like beauty of Deep Yellow and Cobalt Blue, this has to be a HS1 from any position and would be an admirable small telescope gem if you were well entrenched in Northern climes.
 
 









 

 
John M. Ryan
Star: Struve 1965, Zeta Corona Borealis
Date & Time: 27:04:03 11:45 local time
Seeing: 7 <1-10 Seeing Scale (10 best)>
Transparency: Fair to poor, some very
light clouds
Location of site: Barreras, Salamanca, Spain
Site classification: Rural
Sky darkness: 7 <Limiting magnitude>
Transparency:  <1 worst - 10 best>
Conditions: Temp. 14ºC, Light wind
Telescope: Celestron 9.25" SCT
Eyepieces: none
Magnification: Stella Cam Ex video camera, 2.5X Telemate
 

 

 The video camera is black and white so no color can be noted. Another nice fairly close double of semi-bright components. The final result is an average of five measurements. Theta = 306.7º and rho = 6.36"

 
Tom Campbell 
Star: Struve 1965, Zeta Corona Borealis
Date & Time: June 6, 2003,
11:00pm - 12:00am CDT (04:00-05:00 UT)
Seeing: 7 <1-10 Seeing Scale (10 best)>. 
Transparency: 8 <1 worst - 10 best> 
Location of site: Iola, Kansas
Long: 95°24'W Lat: 37°55'N
Site classification: Suburban
Sky darkness: -- <Limiting magnitude> 
Conditions: Temperatures in the lower 60s. There was little or no breeze.
Telescope: Discovery DHQ 8" dobsonian
Eyepieces: 1.25" Plössls - 25mm, 15mm, 10mm, 6mm, 4mm
Magnification: 49x, 81x, 122x, 203x, 305x		 This double could barely be split at 49x, and the best view was at 125x. Both stars appeared white, and one was about a magnitude fainter. There wasn't anything remarkable about this pair, but it still was a nice view.

 

 
Tom Teague
Star: Struve 1965, Zeta Corona Borealis
Date & Time: 2003 June 14 (2145 UT)
Seeing: 5 <1-10 Seeing Scale (10 best)>. 
Transparency: --- <1 worst - 10 best> 
Location of site: Chester, UK
Site classification: Suburban
Sky darkness:  Poor (astronomical twilight)
Conditions: Clear, still, no dew.
Telescope: Zeiss AS 80/1200 refractor
Eyepieces: 
Magnification: x48, x75, x200, x300
 		 Just resolved x48.  Easy at all higher powers, although x300 was quite pointless and I only used it in a futile attempt to beat the seeing and stretch the capabilities of the telescope.  Both components appear white to me, the A component more purely so.  Smyth described A as “bluish white” and B as “smalt blue”, whatever that means.  Webb saw them as “grnsh, w., grnsh” and on another occasion (1850) as “flushed w., blsh. grn.”  I could not detect any clear colour difference and so I award this otherwise quite pretty pair a Harshaw rating of 2.

 
 
 
Tom Campbell 
Star: Struve 1965, Zeta Corona Borealis
Date & Time: 18, 06, 2003
10:30pm - 11:30am CDT (03:30-04:30 UT)
Seeing: 7 <1-10 Seeing Scale (10 best)>
Transparency: 5, Somewhat hazy
Location of site: Iola, Kansas
(Long: 95°24'W Lat: 37°55'N)
Site classification: 
Sky darkness:  <Limiting magnitude>
Transparency:  <1 worst - 10 best>
Conditions: Temperatures in the upper 60s.
There was little or no breeze.
Telescope: Discovery DHQ 8" dobsonian
Eyepieces: 1.25" Plössls - 25mm, 15mm, 10mm, 6mm, 4mm
Magnification: 49x, 81x, 122x, 203x, 305x
 		 This pair was fairly bright and fairly wide. 81x split the double nicely. The brighter star appeared white and the slightly fainter companion had a slightly yellow tint.
   
 
 
 
 
 
 

(c) 1998-2003 The Spirit of 33