Delta Bootis 

Tomas Vazquez Chiscano
Star: Delta Bootis
Date and Time: 25/3/2001. 23:39:06 UT
Seeing: 4 <1 worst - 10 best> 
Location of Site: Sevilla. (Spain)
37º 24 N. 5º 58 W 
Site Classification: Urban 
Sky Darkness: 3 <Limiting Magnitude> 
Telescope: C8 D:203mm. Reducer Focal: F/6,3. 
Magnification: Camera CCD 
Eye Piece(s): -- 


   

 Observation: Camera CCD ST-4. 
Time of Integration: 8 seconds. 
Filter (s): 
Software Lectura CCD: LUCAS 1.1 
Software Treatment: LAIA 3.2A 
Position Image: North up, Este left. 
Telescope Computer Interface: MICRO-GUIDER III. 
Planetariun and Telescope Control Program: ECU. "Earth Cerntered Universe" 

This double is of the easy ones of separating, the main star is 
of magnitude of 3.46 and the secondary of 7.80. My measures are: 
D=104.7" with a position angle AP= 81.02º. 
 
 

 

 
Jim Jones
Star: Delta Bootis
Date and Time: 05/03/01  0716 UTC 
Seeing: 7 <1 worst - 10 best> 
Location of Site: Lake Oswego, Oregon 
Site Classification: Suburban 
Sky Darkness: 4.1 <Limiting Magnitude> 
Moon: 0.773 
Telescope: 8 inch LX50 SCT 
Magnification: 47x, 160x 
Eye Piece(s): 42mm Ultima, 12.5mm CMG 		 Separation and Position Angle measured using Celestron 
Micro Guide and are the average of 5 measurements.

Separation   104.3"
Position Angle  77.3º
Primary...Yellow
Companion much dimmer than primary.
 

 
Bob Hogeveen
Star:Delta Bootis
Date & Time: May 07 2001
Seeing: 6 <1-10 Seeing Scale (10 best)>. 
Location of site: Annen, The Netherlands
(53ºN, 6ºE) 
Site classification: Village backyard
Sky darkness: 3.5 (UMI) <Limiting magnitude> 
Sky : Full Moon in Libra and a slight haze 
Telescope: Meade LX10 (8" f/10 SCT) 
Magnification: ---
Harschaw's Scale: 2 <1 to 5> 
 

Star: Delta Bootis
Date & Time: May 08 2001 
Seeing: 6 <1-10 Seeing Scale (10 best)>. 
Location of site: Annen, The Netherlands
(53ºN, 6ºE) 
Site classification: Village backyard
Sky darkness: 3.5 (UMI) <Limiting magnitude> 
Sky : Twilight and clouds coming in 
Telescope: Swarovski AT80 (80mm spottingscope), Meade LX10 (8" f/10 SCT)
Magnification: 20x
Harschaw's Scale: 2 (AT80) <1 to 5> 

 This very wide pair is a good one for a binoculars-list, the large magnitude difference makes it somewhat interesting. I have observed this pair before with bino's and spottingscope but don't know if the bright yellow color of A was noted. Today, with 8" SCT the yellow color was striking. In contrast (though far away) B seemed blueish. But second though and view makes me hesitate and say it's just greyish. 
 
 
 
 
 
 

A quick check with the spottingscope of this double, which was 
observed  yesterday with LX10. Easy of course, and nice view with 20x. The 
color of A is a striking  bright yellow, B definitely seems to be bluish, 
more than I thought yesterday. 
 
 
 
 
 
 
 

 

 
Stuart
Star: Delta Bootis
Date & Time: Monday 7th May 2001
2215 UT
Seeing: 6 <1-10 Seeing Scale (10 best)>. 
Location of site: Near Halifax, West Yorkshire, England 
Site classification: suburban
Sky darkness: 3.0 (UMi) (Full Moon)
<Limiting magnitude> 
Temperature: 3ºC 
Telescope: GX 250 10" Newtonian
Eyepiece: 20 mm Plossl 
Magnification: 60x		 Another very wide pair but with a big magnitude difference. Although I do nnot have measuring equipment it was necessary to carefully estimate position angle to be certain which of the three approx mag 7.5 stars in thefield was the secondary. The primary was agaions seen as yellow. No colour seen in the secondary. 
 
 
 
 
 

 

 
Cor Berrevoets
Star: Delta Bootis 
Date & Time: 10-may-2001 20:00 - 21:30 UT
Seeing: ? <1-10 Seeing Scale (10 best)>. 
Location of site: Ritthem, The Netherlands
51° 27' N, 003° 38' E
Site classification: Suburban
Sky darkness: 4.5 <Limiting magnitude> 
Telescope: Intes Micro 6" F10 Maksutov 
(35% obstruction)
Eyepieces: 7.5, 10, 15, 20 and
26 mm Plössls
Magnification:75x 

Star: Delta Bootis 
Date & Time: 11-may-2001 20:00 - 22:15 UT
Seeing: ? <1-10 Seeing Scale (10 best)>. 
Location of site: Ritthem, The Netherlands
51° 27' N, 003° 38' E
Site classification: Suburban
Sky darkness: 4.8 <Limiting magnitude> 
Telescope: Intes Micro 6" F10 Maksutov 
(35% obstruction)
Eyepieces: 7.5, 10, 15, 20 and
26 mm Plössls
Magnification: 

 Being a wider pair I could split this one allready through my finder (8x). Using a 20mm (75x) I could not distinguish any colours, at higher magnification the primary seemed to be pale blue but the fainter secondary was colour-less. One real odd this is that in my view the secondary seemed to be a double on its own. I will check on this again (remark: after checking with a few star-image databases (aladin)I still do not know where I went wrong I will investigate the matter. Forget this record please ! 
 
 
 
 
 
 
 
 

Well how wrong can one go ? I made a wrong turn somewhere and it seems 
that I visited Mu-1/2 Bootes yesterday assuming that I visited Delta Bootes. 
today the same thing happened, call me a rookie/newbie ! But I managed to find 
the real Delta Bootes. The primary was bright yellow-white and the companion 
colour-less the split was possible at my finder (8x) and was checked with 15mm 
(100x). 

 
Mary Flanagan
Star: Delta Bootis
Date & Time: 18 May 2001 03:20 UT;
17 May 10:20 CDT
Seeing: 7 <1-10 Seeing Scale (10 best)>. 
Location of site: Apple Valley MN, USA
93º 14' 25"W; 44º 45' 17"N
Site classification: Suburban 
Sky darkness: 4 <Limiting magnitude> 
Transparency: 8 (1-10) 
Telescope: 12.5" f/5 Dobsonian 
Magnification: 50x		 Wide pair was easy at 50x.  Primary white, secondary bluish.
 
 
 
 
 
 

 

 
Ilario Melandri
Star: Delta Bootis
Date & Time: 26 May 2001,
19.32 – 21:08 UTC
Seeing: 8 <1-10 Seeing Scale (10 best)>. 
Location of site: S.Romualdo, Ravenna, Italy. Elevation: 0 m
Site classification: rural
Temperature: +19ºC -> +16ºC
Sky darkness: 4 <Limiting magnitude> 
Telescope: 150mm f/15 achromatic refractor
(lens by Romano Zen, Venice)
Eyepieces: Clave Plossl 16 mm
Magnification: 140x
 		    

    

 
PJ Anway
Star: Delta Bootis
Date & Time: May 30, 2001  03:00 UT 
Seeing: 7 <1-10 Seeing Scale (10 best)>. 
Location of site: Munising Michigan, USA
Site classification: Rural
Sky darkness: 5.6 <Limiting magnitude> 
Sky condition: 1st quarter moon. no clouds 
Temperature: 37°F, 3°C 
Telescope: Zeiss AS 100mm f/10 refractor
on equatorial mount
Eyepieces: 40mm plossl, 25mm, 
12mm & 7mm orthoscopics, 2.4X Dankin barlow 
Magnification: 25X, 40X, 83X, 143X

 

 An easy pair at 25X and 83X. A hint of yellow in primary, secondary a pale blue

Historical reference:
Olcott describes the colors as "yellow-blue"
W. Smyth "A, pale yellow; B, light blue"
 
 
 

 

 
Tim Leese
Star: Delta Bootis
Date and Time: 10 June 2001 ( 22:00UT ).
Seeing: 7 <1 worst - 10 best> 
Location of Site: Cheshire. UK.
53° 15' N -2º 33' W 
Site Classification: Suburban 
Sky Darkness: 3.0 ( UMi ) <Limiting Magnitude> 
Conditions: Clear break in the weather. 
Telescope: 200mm f/6  Newtonian
mounted over a Vixen GP mount (manual slow motion). Any Quoted PA or SEP using Celestron micro guide (CMG).
Magnification: X67 and X322. 
Eye Piece(s): 18mm Orthoscopic, CMG.		 Using a magnification of X67 produced a wide split for this double star. The primary appeared to be a yellow colour with the wide companion a 
bluish colour.

This pair showed a very nice colour contrast even though the sky background wasn't completely dark.
Using the CMG and the drift method I measured the PA of the pair to
be 79deg (AVG of 3 measures).