Struve 1965

Ian Coster
Star: Struve 1965
Date: 07/06/06
Time:23:20 UT
Seeing: 3/5
Transparency: 3/5
Location of site: London
Lat: 51:27:54N, Lon: 0:16:36W
Site classification: Suburban
Conditions: High hazy cloud
Moon: Waxing Moon near full
Sky darkness: Mag4 Sky (ZLM)
Telescope: Orion Optics 200mm F6
Eyepieces: 9mm Ortho
Barlow: No
Magnification: x133

Comments Primary Colour: White Secondary Colour: White General

Notes: Elongated/split with 18mm (x67). Easy split I 9mm (x133) Secondary North West of Primary (about 300 degrees). 5 field stars in 18mm FoV

 
      

David Jenkins
Star: Struve 1965
Date: 12 June 2006
Time:  5:00-7:30 UTC
Seeing: <1-10 Seeing Scale (10 best)>: 5
Transparency: <1-10 Scale (10 best)>: 8
Location of site:Orem, Utah USA
Latitude, 40.29694. Longitude, -111.69389
Site classification: Utah Valley urban area of 500,000 with strong light pollution due to acorn glass street lights which shoot light up and out – The bane of all local observers. Salt Lake City metro light dome to the northwest at 40 miles.
Conditions: Clear, breezy (as can be seen in some of the images), warm
Moon: Full moon raising late in observing session
Sky darkness: <Limiting magnitude>: 3.5
Telescope: Celestron GPS 11" on APT Wedge
Mount: Standard Celestron fork and tripod
Eyepieces: Meade Super Plossl – 32mm
Diagonal: Yes, Meade 1.25" flip mirror diagonal
Magnification: Approximately 350X using Nikon Coolpix 4500 and 4X zoom
Software: Reduc version 3.62 – Great software from Florent Losse. S33 group member.

 		Distance: 6.2, PA: 307
 

       

Richard Jepeal
Star: Struve 1965
Date: June 17, 2006 UT
Seeing: Vary, from 5/10 to 8/10 (Zenith)
Transparency: ---
Location of site: New Britain, Connecticut, USA
Site classification: Urban
Conditions:
Sky darkness:
Telescope: 8in Celestron Nexstar
Eyepieces:
Magnification:

Showcase bluish-white pair. Webb has noted greenish in both stars, as do others. 

 
  

William Schart
Star: Struve 1965
Date: 6/19/06
Time: 10:36 PM
Seeing: 4 out of 5
Transparency:
Location of site: Columbia, USA
Site classification: Suburban
Conditions: warm
Sky darkness: around mag 5 (LM)
Telescope: C8
Eyepieces: 25 and 10 mm
Magnification:  		Easy split about 300. White with perhaps just a tinge of blue.
       

Tom Teague
Star: Struve 1965
Date: 2006 June 29
Time: 2230 UT
Seeing: 7/10
Transparency: Some thin high cloud
Location of site: Chester, England
Site classification: Suburban
Conditions: Still, warm
Sky darkness: Naked eye limiting mag. 3.5
Telescope: 50/540 O.G. (the Agnes Clerke refractor)
Eyepieces: 21.5mm Dialsight
Magnification: x25

On locating Struve 1965, I could immediately see that it was double in approximate PA = 300°. I could not clearly separate the components, which appeared as a figure-of-eight with no dark interspace. Both stars appear white.

Ambience: I saw a splendid iridium flare (magnitude -8) just after I closed down.


 
       

Wolfgang Vollmann
Star: Struve 1965
Date: 2006 July 26
Time: 21:00-24:00 UT
Seeing: 5 <1-10 Seeing Scale (10 best)>
Transparency:  clear
Location of site: Vienna, Austria
Site classification: Suburban
Conditions:
Moon:
Sky darkness: 4.5 <Limiting magnitude>
Telescope: 130/1040mm refractor
Camera: SBIG ST237A CCD
Exposures: 6 or 12 x 10 seconds for astrometry. Distance/PA measurement was done with these images also except where noted (bright stars need shorter exposure times of 1 sec or less)
Image measurement: astrometry with Astrometrica software and UCAC2 or USNO B1.0 catalog (see http://www.astrometrica.at); with exact focal length and image orientation I measured distance and PA with AIP4WIN software. I took means of measuring all my images for a star. There is a scatter of 0.2 arcsec in separation and 0.2 deg in PA. Scatter in PA is much larger if the stars are very close. Note: All images have north up
Eyepieces: n/a
Magnification: n/a

STF1965 = WDS 15394+3638

Zeta CrB is one of the finest double star sights at low to medium power in my telescope! It was not so easy to measure it: a separation of 6.2 arc seconds translates to only 4 pixels at prime focus in my telescope. So I tried and made image series of 12 each using exposure times of 10 seconds for astrometry and 1, 0.1 and 0.01 seconds for the distance and PA measures. Still the standard deviation in PA was quite large, 3.2 deg, which is not unexpected at this separation.

Measure: STF1965: year 2006.57 / distance 6.2 arcsec / PA 306.3 deg


 
      
(c) 1998-2006 The Spirit of 33