| Philippe Dejocas | ||||
| Star:
Pi Bootis
Date & Time: May 01 2001 Seeing: 6.5 <1-10 Seeing Scale (10 best)>. Location of site: Ottawa/Hull, Canada Site classification: suburban, urban Sky darkness: 4.2 (UMI) <Limiting magnitude> Temperature: 15ºC/9ºC (beg/end) Winds : ~10, 15Km/h S/SW Humidity : ~40% Sky : Moon at first quarter and in Leo; sky is a nice dark blue with just a trace of haze Telescope: Aldebaran 6" f5 Newtonian Magnification: 40x, 85x, 120x |
At 40x this first target
established this sense of lone stars dominating their field : I could,
with difficulty, discern maybe half-a-doz. ft. strs. surrounding it. 85x
brought out a pretty double with a blue /white lucida and an off-white
companion ~ 6" EES/ESE. Pushing the power to 120x did not improve the view.
|
|||
| Stuart | ||||
| Star:
Pi Bootis
Date & Time: 3rd May 2001 2205 UT Seeing: 5-6 <1-10 Seeing Scale (10 best)>. Location of site: Near Halifax, West Yorkshire, England Site classification: suburban Sky darkness: 4.2 (UMi) <Limiting magnitude> Temperature: -1C Telescope: GX 250 10" Newtonian Eyepiece: 20 mm Plossl , 9.5 mm Ortho (x126) Magnification: x60, x126 |
Not far from previous star,
Pi is easy to find and identify. Cleanly split at x60, the view was much
better at x126. The primary was seen as white and the dimmer star as pale
yellow.
Ambience: Arrived home late
last evening to a sky clear of cloud for once. Too
The soft light of the 10 day old moon was sufficient to make local security lights less of a nuisance than they often are and give form to trees just starting (and rather late) to break into leaf. A lovely almost still night, just a very light northerly breeze and a slight frost, enough to keep all but star crazy loons inside. Couldn't resist a look at Luna at the end of the session. Gassendi was very impreassive. |
|||
| Rafael Barberá | ||||
| Star:
Pi Bootis
Date & Time: 5/5/2001, 22:01 Seeing: 6 <1-10 Seeing Scale (10 best)>. Location of site: Manises, Valencia, Spain Site classification: Urban Sky darkness: 3.5 (almost full moon) <Limiting magnitude> Telescope: TV85 85mm F/7 F.L.: 600mm Eyepiece: Eudascopic 5mm Magnification: 48x, 120x |
I don't take notes of this
star (mea culpa). I remember that I need 48x to
split them. Also, I was lost for a couple of minutes trying to split Zeta Bootes instead of Pi... I need a second round with this star. |
|||
| Bob Hogeveen | ||||
| Star:
Pi 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: 50x, 100x Harschaw's Scale: 1 <1 to 5> Star: Pi Bootis
|
A very beautiful double.
Best, and striking view with 100x. With 50x also a nice and easy split.
A is white and B is yellow
A quick check with the spottingscope
of this double, which was observed yesterday with LX10. Needed 60x
(which is maximum for this scope) for a split. A beautiful and attractive
double, but comes out better with the bigger scope.
|
|||
| Cor Berrevoets | ||||
| Star:
Pi 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, 150x |
At 20mm (75x) I could split
this one easily, both of the stars look pale
blue at 10mm (150x). |
|||
| John M. Ryan | ||||
| Star:
Pi Bootis
Date & Time: 11 May 2001 ( 23:00 UT ). Seeing: 7 <1-10 Seeing Scale (10 best)>. Location of site: Barreras, Salamanca, Spain. Site classification: Rural,Suburban. Sky darkness: 4 <Limiting magnitude> Sky: Moon rising, fairly dry and calm. Telescope: Meade 8" SCT Eyepieces: 20mm plossl, 7mm ortho Magnification: 100X and 286X |
Split with the 20mm at 100X, better at 286X with the 7mm. Both components white with a tint of blue. Not much contrast in magnitudes. With the 7mm the airy discs and surronding rings were very prominent atesting to the good seeing and the collimation of the scope. I rated this as 2.5. | |||
| Tim Leese | ||||
| Star:
Pi Bootis
Date & Time: 12 May 2001 ( 21:50 UT ) Seeing: 5-6 <1-10 Seeing Scale (10 best)>. Location of site: Cheshire. UK 53° 15' N -2º 33' W Site classification: Suburban Sky darkness: ? <Limiting magnitude> Conditions: Nice clear night, looking good. Telescope: 200mm f/6 Newtonian mounted over a Vixen GP mount (manual slow motion). Eyepieces: 9mm, 6mm UO orthoscopic Magnification: X133,X200 |
Using X200 I found a lovely
pair white / off white stars.
The PA of the secondary was estimated to be about 110deg. I thought that the best view was obtained using X133 as the two stars appeared to hold steady. A very nice classic double star view. |
|||
| William Schart | ||||
| Star:
Pi Bootis
Date & Time: May 12, 2001, 9:22-11:08 pm CDT Seeing: 8 <1-10 Seeing Scale (10 best)>. Location of site: Killeen, TX, USA 31ºN, 97ºW Site classification: Suburban Sky darkness: 4 <Limiting magnitude> Conditions: Nice clear night, looking good. Telescope: Celestron 8" SCT Eyepieces: 25 mm, 17 mm, 12.5 mm (MG) Magnification: 80X, 117X, 160X |
Bright, close, and little
magnitude difference, but still I split it at low power. SEP 6.3”,
PA 105.3 (ave of 5 measures).
|
|||
| Jim Jones | ||||
| Star:
Pi Bootis
Date & Time: 05/20/01, 0730 UTC Seeing: 5 <1-10 Seeing Scale (10 best)>. Location of site: Independence, OR, USA Site classification: Rural Sky darkness: 4.6 in Bootes <Limiting magnitude> Sky: Very clear, Moon 4 days past last quarter in Piscium Telescope: 8 inch LX50 SCT Eye Piece(s): 26mm Meade 4000 Magnification: 76x |
Est PA without inst...120d
Primary....White, Companion...Yellow-white A bright double in the middle of a dim, sparse field. A mag 9 or 10 star to the east and another to the south and that's it. Field doesn't look any better through the ST80.
|
|||
| Chuck Shinn | ||||
| Star:
Pi Bootis
Date and Time: 05/22/01 UT: 0300-0445 Seeing: 6 <1 worst - 10 best> Location of Site: Northern Texas (USA) Site Classification: Suburban Sky conditions: Clear with no moon Sky Darkness: 4.5 <Limiting Magnitude> Transparency: 7 out of 10 Telescope: Questar 3.5 (90mm) Maksutov Magnification: 105X Eye Piece(s): 24mm Brandon w/1.6X barlow |
Clean split.
Colors noted: Blue/Wht |
|||
| Patrick J. Anway | ||||
| Star:
Pi Bootis
Date & Time: May 21, 2001 04:00 UT Seeing: 8 <1-10 Seeing Scale (10 best)>. Location of site: Munising, Michigan, USA Site classification: Rural Sky conditions: No moon. few high clouds Temperature: 40°F, 5°C Sky darkness: 5.9 <Limiting magnitude> Telescope: Zeiss AS 100mm f/10 refractor on equatorial mount Eyepieces: 40mm plossl, 25mm, 9mm & 6mm orthoscopics Magnification: 25X, 40X, 111X, 166X |
At 40X showed elongation
and at 111X clearly split. Flammarion called it a "beautiful couple" and
I would agree - a pretty pair of two nearly equal white stars. Sir John
Herschel reported them as: "Nearly equal; large is white; the smaller perhaps
inclines to blue".
|
|||
| Rafael Benavides | ||||
| Star:
Pi Bootis
Date & Time: 25 - May - 2001 (21 h 00 m UT) Seeing: 7 <1-10 Seeing Scale (10 best)>. Location of site: Posadas (Córdoba), Spain 37º 48' N - 5º 08' 30" W - 100 mts over sea level Site classification: Suburban Temperature: 25ºC Sky darkness: 5.6 <Limiting magnitude> Telescope: Helios 120 mm f/8.3 achromatic refractor Eyepieces: Plossl 20 mm, Plossl 10 mm, Microguide 12.5 mm, 2x Barlow, 3x Barlow, diagonal prism Magnification: 50x, 100x, 263x, 500x |
Using a magnification of
50x I could see a nice close pair of white stars. The best view came from
using 100x giving a bright pair. Using MicroGuide at 263x (With Barlow
2x) and at 500x (with Barlow 3x) from an average of 8 measures the PA between
the two stars was estimated to be 108º and a separation of 5"56 sec.
Ambience: Nights are warmer
and shorter. Nowadays it´s difficult to spend lots of
|
|||
| Ilario Melandri | ||||
| Star:
Pi 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 |
|
|||
| Thad Robosson | ||||
| Star:
Pi Bootis
Date and Time: 5-29-01, 3:30UT Seeing: 7 <1 worst - 10 best> Location of Site: Phx, Az, USA Site Classification: Suburban Sky conditions: Clear and nice. Nearly 1rst quarter Moon Sky Darkness: 4 <Limiting Magnitude> Telescope: Meade 90mm ETX Magnification: 39x, 83x Eye Piece(s): 2x barlow, 32mm Meade SuperWide, 10 & 15mm Vixen Lanthanums |
15mm and 32mm (83x & 39x) both this one showed as double. The difference was that the lower power gave the primary a bluish tinge. 15mm showed a weak blue with a weak orange-yellow comp. at 90* Rated a 2 for the tightness. | |||
| Jose Fernandez | ||||
| Star:
Pi Bootis
Date & Time: June 22 2001 Seeing: 1.4" approximately Location of site: L'Angliru. Asturias, Spain. 43º13'16"N - 05º56'34"W Elevation: 1540 meters Site classification: Rural Sky darkness: 5.5 limiting magnitude Telescope: University Optics 80 mm f6.25. Barlow 2x with effective focal lenght (efl) of 1571mm Eyepieces: Meade SWA 24.5 mm, Celestron MicroGuide. Constant scale=13.13+-0.20 "/div Magnification: 20x, 131x |
Separation=6.6"+-3.3"
PA = 110º+-0.5 No colors detected With small separations it is evident that the necessity to have a big efl. A variation of 0.25 divisions in the linear scale is translated in 3.3"!!!!!!
|
|||