| Ilario Melandri | ||||
| Star:
Delta Cygnus
Date & Time: 06/07/2000 – 23.18 UT Seeing: 4 <1-10 Seeing Scale (10 best)> Location of site: Italy, Ravenna, San Romualdo, Lat 44 32’N Lon 12 08’E Elevation: 0 m Site classification: Rural Sky darkness: 4 <Limiting magnitude> Temperature: 21C Telescope: 150 mm f/15 achromatic refractor (lens by Romano Zen, Venice). Magnification: 140 x (eyepiece Clave Plossl 16 mm) |
Notes: fantastic!!
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| Bill Reinehr | ||||
| Star:
Delta Cygnus
Date & Time: July 21, 2000, 2000 05:00 UTC Seeing: 8+ (very still) <1-10 Seeing Scale (10 best)> Location of site: Pflugerville, Texas, USA (30 degrees N.) Site classification: Suburban Sky darkness: 4.1 <Limiting magnitude> Temperature: 82F Telescope: Vixen 80mm Fluorite, f/8 on Custom D altaz mount Magnification: 142x (9mm Vixen Lan & 2x Barlow), 183x (7mm Pentax XL & 2x Barlow)
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Split but not cleanly at 142x, a clean split at 183x.
Pretty tough. I've tried and failed to split it on evenings when the seeing
was not as good. No color noted.
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| William L. Schart | ||||
| Star: Delta Cygnus
Date & Time: 7/24/00 11:28 pm CDT Seeing: 8 <1-10 Seeing Scale (10 best)> Location of site: Killeen, TX (Lat 31 N, Elev 600 ft) Site classification: Suburban Sky darkness: 4 <Limiting magnitude> Telescope: Orion 6" Dob. Magnification: 32x, 120x, 240x |
Suceeded in splitting this tonight at 240x. The conditions
were pretty good, which probably helped. I used both the hex mask and no
mask in conjunction with my barlow. I think it was better without the mask.
At 120x, nothing was doing without the mask; with the mask I got a bit
of a notch but no separation.
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| Richard Harshaw | ||||
| Star: Delta Cygnus
Location of site: Northern Kansas City, Missouri (USA). 94d 30m west longitude, 39d 15m north latitude 980 ft above Mean Sea Level Date of observations (UT): 03:30 on 26 July, 2000 Site classification: suburban Sky conditions: Seeing-- 6 out of 10, but highly variable Transparency-- 6 out of 10 Limiting visual magnitude-- 4.0 Telescope: Celestron C-8 Eyepiece: 10 mm Ortho + Barlow, 516x, with mask |
Magnitudes: 2.9 (B9 III), 6.3, 11.9
Sep/PA's: AB = 2.4" + / 225 -. AC = 66" / 66. Year of last measurement: 1997 Distance (light years): 171 Luminosity (in suns): 168 Eyepiece and magnification: 10 mm Ortho + Barlow, 516x, with mask Colors noted: W, B, bW (But Webb saw G and W for A, B.) The B star was very difficult to see. It sat on the second diffraction ring, hence the use of the mask. The pair was discovered by W Herschel in 1783. First measure (1830, F. Struve): 1.9" / 41. Van Biesbroeck obtained 1.6" / 288 in 1911. Espin found a faint comes at 130" @ 64. It was in fact a double (11.5m and 12.5m, 2.6" @ 310). Its orbit takes 827.6 years (Baize, 1973). Star A is a spectroscopic binary that rotates at 149 kps. It is also an infra-red source.
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| Luis Argüelles | ||||
| Star:
Delta Cygnus
Date and Time: 30, July, 2000, 21:28 UT Seeing: 7 <1-10 Seeing Scale (10 best)> Sky darkness: 3.0 <Limiting magnitude> Transparency: 5-6 Temperature: 16C, light breeze Location of site: Quintueles, near Gijón, Spain Site classification: Suburban Telescope: Vixen 102M, 4" achromatic refractor Eyepiece(s): Eudiascopic 5mm and 2x Celestron Barlow Ultima Magnification(s): 200x, 400x |
A really tight double from the same observational family
as Antares in
Scorpius. The primary is rather bright (magnitude 3) and there is a “delta-magnitude” of 3.5 with respect to the other component. With the observing conditions in this night this star is a challenge to split, althought I get it at 200x when a “seeing” of 7 comes, but the secondary vanishes when it goes lower. Using the Barlow and the Eudiascopic 5mm eyepiece I feel some problems
Coloration is appreciated at 200x as orange and blue, and it’s even
more
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| John M. Ryan | ||||
| Star:
Delta Cygnus
Date of Observation: 1/08/00 22UT Location of Observation: Ciudad Rodrigo, Salamanca, Spain 40º 36' N, 6º 32'W, Elev. 800 Meters Seeing: 5 to 6 (1 - 10, 10 best) Transparency: 6 Misty Limiting Mag. (naked eye): 3.5 Site classification: Urban Instrument: Meade 8"SCT Magnification: 286X (7mm Ortho) and 400X (5mm Ortho) |
Separation (Clear or Touching):Clear
Magnitude Comment: The comes was much dimmer in comparison. Color Comment: Both white General Comment: Could not separate the double until I boosted the magnification
to 286X and then it was just coming clear. At 400X the comes was sitting
small and very pretty just outside the glare of the primary. Until the
double star separation my two orthos were just sitting in the case but
they sure are handy now.
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| Jim Jones | ||||
| Star:
Delta Cygnus
Date & Time: 0520 UTC, August 3, 2000 Seeing: 6 <1-10 Seeing Scale (10 best)> Location of site: Lake Oswego, Oregon, USA Site classification: Suburban Sky darkness: 4.5 <Limiting magnitude> Telescope: 8 inch LX50 SCT Eye Piece(s): 18mm Radian/2X Ultima (Between OTA and diagonal) Magnification: 336x |
Visible periodically between diffraction rings. Comes
and goes but clearly visible. Also visible at 224x but not as often. No
color noted. Est PA 230d without insturments.
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| Rich Tyson | ||||
| Star:
Delta Cygnus
Date & Time: 8/6/00, 2:08 UT Seeing: 6 <1-10 Scale (10 best)> Location of site: Robert Mosses State Park, Long Island, New York. 40º 71N, 73º 30W Site classification: Suburban Sky darkness: 5.0 <limiting magnitude> Telescope: 10" reflector Magnification: 253x |
A difficult star to split. Both stars appear blue/white
in color. Secondary Star had a hint of yellow to it.
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| Tom Teague | ||||
| Star:
Delta Cygnus
Date & Time: 2000 August 11, 23:00 UT Seeing: 8 <1-10 Seeing Scale (10 best)>. Location of site: Chester, England (53 11 08N; 02 51 39W) Site classification: Suburban Sky darkness: 4 (Moon present) <Limiting magnitude> Telescope: 63mm Zeiss Telementor refractor Magnification: x140, x210 |
This is one of those unequal pairs on which a small refractor can outperform
a larger reflector or catadioptric instrument.
Not difficult x210 - comes held constantly with a/v. Both components seem yellow to me. Comes also seen x140, but with difficulty - held with a/v for several seconds at a time, but not continuously as with the higher power. I have observed this pair many times in the past. In my experience, seeing conditions are absolutely critical for a good view, regardless of aperture. Accurate focusing is also critical. If the focus is less than perfect, the diffraction rings may appear slightly too bright, and you will then be lucky to detect the comes as a localised brightening of the inner ring, if at all. In my 215mm f/5 Newtonian, this pair is not significantly easier than
in the little Zeiss.
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| Tim Leese | ||||
| Star:
Delta Cygnus
Date & Time: 11/12 Aug 2000 (21:00UT- 01:00UT) Seeing: 6-7 <1-10 Seeing Scale (10 best)> Location of site: Cheshire. UK Site classification: Suburban Sky darkness: 3, moon ( low in sky ) <Limiting magnitude> Telescope: 200mm f/6 Newtonian scope mounted over a Vixen GP mount (manual slow motion). Any Quoted PA or SEP using micro guide Magnification: X60, X120, X240 |
Nothing doing at X60 for this system. Using X120 I could
just see the secondary popping in and out of the view just to one side of a diffraction spike! A magnification of X240 was needed to get a complete split with the primary seeming to be a white colour and the secondary being off white.
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| Cor Berrevoets | ||||
| Star:
Delta Cygnus
Date & Time: 13 august 2000, 23:20 MET / 21:20 UTC Seeing: 6 <1-10 Seeing Scale (10 best)> Location of site: Ritthem, The Netherlands, EU Site classification: Rural Sky darkness: ~4 <Limiting magnitude> Temperature : 20 C Telescope: Intes Micro 603 150/1500 (MCT) on CG-5 mount with dual-drive. Magnification: 10 and 15 mm with 2.4 Intes Barlow (240 - 360x) |
Due to some tube-currents the split was difficult earlier
in the
evening. But at 23:00 most of my Mak-plague had gone and at 240x I could see a hint of the secondary (disturbance) in between the 2nd/3rd diffraction zone. At 360 it was easy split, the secondary showed up like a small brightened knot near to the 3rd diffraction ring. I did see no colors.
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| Patrick J. Anway | ||||
| Star: Delta Cygnus
Date & Time: August 18, 2000 - 03:00 UT Seeing: 7 <1-10 Seeing Scale (10 best)> Location of Site: Munising Michigan USA Site Classification: Rural Sky darkness: 6 <limiting magnitude> Sky condition: Moon just below east horizon; no clouds Temperature: 50*F 10*C Telescope: Vixen 102/1000 f9.8 refractors on equatorial mount Eyepiece: Vixen 6mm orthoscopic (with Lumicon OIII & UHC filters) Magnification: 166x |
I used Vixen 4" and a 6mm ortho, for 166X and a
clean split using the nebula filters. With the OIII filter the primary
was a deep red and the brightest component; the secondary was an off-white
with perhaps a hint of blue.
Using the UHC I found the secondary more obvious and while the primary
remained a deep red, the
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