Struve 28

Bob Hogeveen
Star: Struve 28
Date & Time: May 06, 2005, 22.15 LT
Seeing:
Transparency:
Location of site: Annen, The Netherlands, 53N 6E
Site classification: Suburban
Sky darkness:
Telescope: Leica 10x42 binoculars, AP Starfire 5' f/6
Mount: Losmandy G-11
Eyepieces: Pentax 40mm, Nagler 12mm + TV powermate 2x
Magnification: 7x, 10x, 20x, 135x

 		Checking out the area with handheld binoculars already shows this wide and bright pair (a virtual pair?).

Also the 7x50 finderscope of my Starfire shows the pair nicely. The Starfire itself, using lowest power (20x) shows a pair of bright stars in a light blue background.

Using some more power darkens the background and reveals a surprise (well, not really unexpected...): B (Mu-2) is a very nice double itself (STF1938 - sep. 2.2").

135x gives a nice picture of this, A very bright and white and B split into a subtle pair.


Steve Bodin
Star: Struve 28
Date & Time: 24 May 2005, 10pm to midnight
Seeing: 2/10 improving to 5/10
Transparency: fair
Location of site: Silverdale Wa, USA, 47N,123W
Site classification: Suburb
Conditions: 55F, no wind, damp
Sky darkness: limiting mag 5.6
Telescope: Celestron C8
Eyepieces: not used
Imaging: DX8263SL video camera at prime focus, f10, and 3x
Magnification: app. 333x and 1000x

 A favorite of mine because of the wonderful color contrast. Yellow, bright
primary and twin blue companions. Measured, AB 108.31 sec at 169.2 deg PA. BC, 2.18 sec at 006.6 deg PA.
 

 

  
 
Alessandro Bertoglio
Star: Struve 28
Date & Time: 24 May 2005 20.31 UTC
Seeing: III - IV Antoniadi
Transparency:
Location of site: Turin, Italy, 4504N 0742E
Site classification: Urban area with strong light pollution
Conditions: clear, no wind, mild temperature
Moon: none
Sky darkness: 3 (limiting magnitude)
Telescope: Takahashi Mewlon 300, Dall-Kirkham 300/3572 reflector
Eyepieces: Televue Plossl 15 mm.
Magnification: 238X
Diagonal: Yes, Televue 2" Everbrite
 

Really it's an easy and interesting triple star. The primary is very bright, white with slight yellowish reflexes, The secondary, rather distant from the primary, is well splitted into two considerably dimmer (but well visible) components close togheter (extimated separation about 2" to 3").

These last stars, showing faint rings, have comparable brightness, the difference is extimated about 0.5 mag or slightly less, and the colours are the same of the brighter primary, maybe very little yellowish. Extimated PA: A-BC very slightly less than 180 degrees (between 175 and 180 degrees), B-C about 20 degrees. Fine triple star for every telescope.
 

 
  
    

Jean Louis Badin
Star: Struve 28
Date & Time: 25 May 2005 20.45 UTC
Seeing: III  Danjon
Transparency:
Location of site: Noisy le Grand - France 48°51 N 2°33 E
Site classification: Urban area with strong light pollution
Conditions: clear, wind, mild temperature.
Moon: none
Sky darkness: 2.5 (limiting magnitude)
Telescope: Nexstar 8 ( 203 /2000)
Mount: 10 : count equatoriale Celestron.
Eyepieces: Baader Eudiascopique 15 mm
Magnification: 133X
Diagonal: Yes, Televue 2" Everbrite
 
Into visual, I do not note such a difference in magnitude. I am surprised when I see the magnitudes of stars. The glare of both seemed to me close The color of principal is white with yellow reflections. The secondary is white. Separation is superb in a LV 15 mm. I do not have other stars in the field of the eyepiece. Very aesthetic because of the magnitudes and separation. For BC, I did not know that it thus existed I did not push the enlargement on B to visualize it. Too bad!


 
      

Louis Marchesi
Star: Struve 28
Date & Time: 28 May 2005 2:39 UTC
Seeing: Pickering 3
Transparency: Average
Location of site: New London Township, PA, US (+39d45m,-75d52m)
Site classification: Suburban/Rural
Conditions: Clear, calm, 11C (52F)
Sky darkness: Not determined
Moon: None
Telescope: TMB152 f/7.9 Apochromatic Refractor
Mount: Losmandy G-11
Eyepieces: Baader Mark V Binocular Viewer with 1.25x Glaspath
Compensator
TMB Super Monocentrics 14mm, 8mm
 Magnification:107x, 188x

 The AB pair, also known as Mu 1 and 2 Bootis, are easy at 107x; they were very-well separated at 107x and were white and yellow. However, the B star was, with some effort, seen as double itself. Although I could see the duplicity at 107x, increasing the magnification to 188x made the pair easier to separate. Both components of the BC pairing (Struve 1938) were yellow and very close in brightness.


Morgan Spangle
Star: Struve 28
Date & Time: May 29-30, 2005
Seeing: 4/5
Transparency: 2/5
Location of site: Larchmont, NY
40 55N 73 44W
Site classification:
Conditions: steady, calm, high haze, passing clouds
Sky darkness:
Telescope: Borg 101ED fl: 640mm
CCD Camera: ST237A, 2.39 pixels/arcsec
FOV 25 x 19'
Eyepieces:
Magnification:

 107.2" - 170.6 DEG


 


William Schart
Star: Struve 28
Date & Time: June 11, 2005
Seeing: Steady
Transparency:
Location of site: Texas,USA
Site classification: Suburban
Sky darkness:
Moon: crescent moon
Telescope: Celestron C8
Eyepieces:
Magnification:
Interesting system. A bright yellow primary, the BC combo seems orange to me. BC definately elongated at low power, and cleanly split at mid power, more or less equal in magnitude and PA about 20°.


Jean Louis Badin / Lionel Alphonse
Star: Struve 28
Date & Time: 11 june 2005 22:54 UTC
Seeing: III  Danjon
Transparency:
Location of site: Noisy le Grand - France 48°51 N 2°33 E
Site classification: Urban area with strong light pollution
Conditions: sky veiled with clouds of high altitude..
Moon: slept :)
Sky darkness: 4 (limiting magnitude)
Telescope: LX 200 GPS 254 mm / 2500.
Mount: count equatoriale Meade.
Eyepieces: Meade Super Plossl 12,4 mm
Magnification: 205 X
Diagonal: Yes, Televue 2" Everbrite  with reducer of diameter.
 

The two components are visible but for the secondary component, we have only
one star. We then observed with Meade Super Plossl 12,4 Misters Là, the principal component is quite visible, quite brilliant as well as the TWO secondary components which are accollées. For the colors, the principal component is with reflections jaunatres. For the secondary component, that of left is bleuatre, that of right-hand side blanchatre. For Lionel (daltonic), the principal component is bleuatre and the secondaries rougeatres

Separation is without concern between the principal one and the secondaries.
For Thierry, the principal one is blanchatre with reflections yellow - green, the secondaries white. The secondaries are close at two seconds to arc but visible without difficulty to the 12,4 mm. For the differences in magnitude, I still do not find that it has as much difference between the principal one and secondary in spite of a difference indicated of 3. The two secondary stars on the level component have a comparable glare. A beautiful star doubles to look at again.
 
      
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