Bur 975 

Richard Harshaw 
Star: Bur 975 
Date & Time: 6 July, 2001, 03:00 to 04:55, UT
Seeing: 8 <1-10 Seeing Scale (10 best)>. 
Transparency: 6-7/10 ,variable, due to high hazy clouds 
Location of site: Northern Kansas City, Missouri. 39º 15' N, 94º 30' W, 980 ft above Mean Sea Level
Site classification: Suburban
Sky darkness:  <Limiting magnitude>
Telescope: Celestron C-11
Eyepieces: 25mm Plossl, 9mm Lanthanum 
Magnification: 112x, 311x
Bur 975 (OS 367 rej; Hough 648 (a)) 
Position:  1915+3434 
Magnitudes:  7.2 (F5 IV), 12.7, 9.7, 9.7 
Sep/PA's:   Aa- 21- / 74+,  AB- 33- / 228=,  AC- 0.9+/261+! 
Year of this measurement:  1998 
Colors noted:  W, ?, O?, ? 

Comments:  Observed at 112x where "a" was suspected.  At 311x, "a" was confirmed.  The BC split was very difficult, only being cleanly split at moments of exceptional seeing. 
Rating:  3 


 
William Schart 
Star: Bur 975 
Date & Time: July/9/01 0500 to 0635 UT
Seeing: 7 <1-10 Seeing Scale (10 best)>. 
Location of site: Killeen, TX, USA
Site classification: Suburban
Sky darkness: 4 <Limiting magnitude>
Temperature: In the 80's F (30's C). Slight breeze. 
Telescope: Celestar 8" SCT
Eyepieces:  25mm, 17mm, 10mm
Magnification: 80x, 120x, 200x
Very tight and faint. Just an elongation at low power. Split at mid powere and confirmed at high power. I would however say that the best view was at mid power.

 


 
Bob Hogeveen 
Star: Bur 975 
Date & Time: 26 July, 2001, 00:00
Seeing: 6 <1-10 Seeing Scale (10 best)>. 
Location of site: Annen, The Netherlands - 53N, 6E
Site classification: Village backyard
Sky darkness: 4 <Limiting magnitude> 
Telescope: Celestron C-11
Eyepieces: Ultima 30mm , LV 15mm, 7mm 
Magnification: 93x, 187x, 400x
Harshaw Scale: 4 <1-5; 1 best>
This double puzzled me. What I did see was a very wide pair, corresponding with OS 367 (7.2 - 9.7 33"). And there was nothing else... No Aa, no BC. Even at 400x I could detect no signs of doubleness with either stars. This was confirmed by Skymap because Tycho/Hipparcos mention no multiplicity. On the other hand there are the reports of Richard and William...
I will need to revisit this double asap, maybe tonight...

 
Stuart Clough
Star: Bur 975 
Date & Time: 27.07.01. 2135 UT
Seeing: 7 <1-10 Seeing Scale (10 best)>. 
Location of site: Near Halifax
West Yorkshire, England.
Site classification: Suburban
Sky darkness: 4.4 (U Mi) <Limiting magnitude> 
Temperature: 22 C
Conditions: No cloud, Lt. Airs, balmy.
Telescope: Orion Optics UK GX250
10"  f4.8 Newtonian on Vixen GP mount.
Eyepieces: 6 mm Triplane 7.5 mm Plossl, 9mm Ortho, Ultima Barlow.
Magnification: x160, x200, x267, x320
Certainly the hardest one this session with a published separation of only 1.3 arc seconds. The first evidence of duplicity came at 200 times when I thought I could see elongation and, occasionally, two stars but no real darkness between. The split was confirmed at x267 and almost constant at x320. An impression of  yellow in the primary, same colour but deeper in the companion. These colours reported hesitantly.

 
Otto Piechowski
Star: Bur 975
Date & Time: 9 PM EDT Saturday, August 18 to 2 AM, Sunday, August 19
Seeing: 8 <1-10 Seeing Scale (10 best)>. 
Location of site: Lexington, KY, USA 
Site classification: Urban area
Sky darkness: 4.5 (Zenith Unaided) <Limiting magnitude>
Conditions: Clear, a bit of haze, still, c. 65 degrees F, very slight breeze
Telescope: 150 mm Maksutov Cassegrain
(Intes standard MK 67) 
Eyepieces:  30 mm ?, 16 mm Rini, 11.4 mm Rini, 7 mm and 4 mm celestron orthos, 5 mm University Optics ortho.
Magnification: 158x, 360x
I easily saw the separation, but I am not sure this star is labeled correctly.  The components are listed as 97/98 yet in Uranometria, the star at that location is    listed as a 6th magnitude star.
 
 
 
 

 


 
Jim Jones
Star: Bur 975
Date & Time: 08/26/01  0630 UTC
Seeing: 6 <1-10 Seeing Scale (10 best)>. 
Location of site: Independence, Oregon
Site classification: Rural
Sky darkness: 5.2 <Limiting magnitude>
Conditions: First Quarter + 1 day.
Telescope: 8" LX50
Eyepieces: 18mm Radian, 7mm Ortho, 12.5mm CMG, 2x Ultima
Magnification: 112x, 160x, 224x, 285x
After reading the reports on the 33-doubles page I was pretty much convinced that this is the Bermuda Triangle of double stars.  These four unremarkable stars have been visited in the past by O. Struve, Burnham, and Hough.  Each left a partial description.

I was disappointed that I was unable to clearly resolve BU 975.  I
was also surprised that I couldn't see the mag 12.7 companion of
HO 648 BC.  As I say below, this double was last reported in 1913.

This system (if it is a system) consists of four stars that have been reported variously as BU975, STT 367 A-BC (7.3, 10.3 mag, 33.6" at 227d), and HO 648 BC (7.1, 12.7 mag, 21.4" at 074d).

I spent a great deal of time over 3 evenings observing this double.  I made sure that I had the right system with a single CMG measurement of  STT 367 A-BC that yielded a separation of 31.5" and PA 227d. In spite of many attempts under fairly dark skies I was never able to split BU 975.  The best I was able to do was an elongation which I considered to be no more than an indication of duplicity.  WDS gives the separation of this double as 0.6" measured in 1998.

I was also unable to observe the 12.7 mag companion of HO648.
This double was last reported (according to WDS) in 1913.

"The WDS "Neglected Double" list shows STF 37 AD, STF 37 BC and STF 37 BD as being last reported in 1910. Upon examination it appears that these "neglected" components are simply "kitty corner" measurements of the the well know and well reported double-double." Further, as Richard Harshaw reported,
STF 37 should be SI 37. One of the challenges of working with the Neglected Doubles is that many are neglected because of accounting errors.
 
Ambiance:  Very clear evening after a few early clouds.  Most people seemed to be going about their Sunday evening routine quietly.  Probably cool enough to keep them inside.  Now and then a the noise of a car making it's way through the country roads.  A cricket held forth early in the evening.  Later the cricket was quiet and the frogs down by the Willemette River had their turn.  One of the frogs probably ate the cricket.
 

 
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