Struve 1821

Bob Hogeveen
Star: Struve 1821
Date & Time: May 06, 2005, 22.35 LT
Seeing:
Transparency:
Location of site: Annen, The Netherlands, 53N 6E
Site classification: Suburban
Sky darkness:
Telescope: AP Starfire 5' f/6
Mount: Losmandy G-11
Eyepieces: Pentax 40mm + TV powermate 2x
Magnification: 40x
 		Again a favourite of mine and a wonderful sight with low power when Iota
is in the same FOV. Kappa gets a rating 1 on the Harshaw-scale, even
though both stars do not show color, they are "just" white.


Florent Losse
Star: Struve 1821
Date & Time: May 23-24th, 2005
Seeing: 3-6/10
Transparency: poor, high altitude clouds
Location of site: St Pardon de Conques, France 4433N 0012W
Site classification: Rural
Conditions:
Sky darkness: m=5 between clouds
Moon:
Telescope:
- visual : T115, guidescope suited with a 20mm eyepiece (G=45x)
- imaging : homemade Newt T200, Barlow 3x, Audine K400 (sampling 0"43/px)
Reductions: done with a future release of Reduc.
Eyepieces: 20mm
 Magnification: 45x

 Nice field with STF26. A great sight. Measured 236°81/13"68
 

Stev
Steve Bodin
Star: Struve 1821
Date & Time: 27 May 2005, 10pm to midnight
Seeing: 4-5/10
Transparency: fair
Location of site: Silverdale Wa, USA, 47N,123W
Site classification: Suburb
Conditions: 60F, no wind, dry
Sky darkness: limiting mag 5.6
Moon:
Telescope: Celestron C8
Eyepieces: not used
Imaging: DX8263SL video camera at prime focus, f10
Magnification: app. 333x

 Finally a brighter pair, seen many times in the past. Warm color primary
and blue companion. Measured, 14.35 sec at 237.9 deg PA.
 

 

 
  
Alessandro Bertoglio
Star: Struve 1821
Date & Time: 27 May 2005 21.56 UTC
Seeing: IV Antoniadi
Transparency:
Location of site: Turin, Italy, 4504N 0742E
Site classification: Urban area with strong light pollution
Conditions: clear, no wind, mild temperature, little hazy
Moon: none
Sky darkness: 2.5-3 (limiting magnitude)
Telescope: Takahashi Mewlon 300, Dall-Kirkham 300/3572 reflector
Mount: 10 Micron GM2000 with FS2 controller
Eyepieces: Televue Plossl 15 mm.
Magnification: 238X
Diagonal: Yes, Televue 2" Everbrite

Finally a very bright double star! It's very easy with its components pretty distant. The primary is very bright, white to yellowish. The secondary is fainter but still bright for my eye, its colour is particular: about lilac (!). Both stars show interrupted rings. Extimated PA about 240 degrees. Fine pair well suitable for small instruments; fine and curious secondary colour.

 
        

Louis Marchesi
Star: Struve 1821
Date & Time: 29 May 2005 3:54 UTC
Seeing: Pickering 3
Transparency: Below Average
Location of site: New London Township, PA, US (+39d45m,-75d52m)
Site classification: Suburban/Rural
Conditions: Clear, calm, heavy dew, 10C (50F)
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
 Magnification:107x

 This bright pair stood out among the fainter doubles observed tonight, as if to punctuate my observing session with an exclamation point. The primary (Kappa 2) was white with perhaps the faintest tinge of yellow; the companion (Kappa 1) was the palest of blues. It was nice to see some color, subtle though it was.


Jean Louis Badin / Lionel Alphonse
Star: Struve 1821
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.
 
For the difference in magnitude, it is perceptible but light. The principal component is blanchatre with weak yellow reflections, the secondary component is bluish. Separation is easily perceptible to the 17 Misters His with dimensions esthetics is very marked because of the brightness of the components and of separation (close stars). Lionel thus sees principal the bleuatre,la secondary jaunatre the opposite of me! Franck saw principal the bleuatre and it secondary bleuatre with weak reflections rougeatres! It should be noted that the principal one is of A5 type thus of bluish color:))
 
     
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