| Chuck Layton | ||||
| Star:
Otto Struve 111
Date & Time: Nov. 19, 1998, 07:45 UT Seeing: 4 <1-10 Seeing Scale (10 best)> Location of site: Tacoma (WA) Site classification: --- Sky darkness: 4.1 <Limiting magnitude> Telescope: 20cm f/6 Eq. Newtonian Magnification: 177x, 271x |
Observed Colorations of Components: Primary is yellowish white, comes is white. Other comments: This is a very challenging pair due to the magnitude difference and close seperation. Averted vision helped. | |||
| Paolo Morini | ||||
| Star:
Otto Struve 111
Date & Time: 07 Dec 1998, approx 23 UTC Seeing: 8 <1-10 Seeing Scale (10 best)> Location of site: San Romualdo, a little village in the country near Ravenna – Italy. Site classification: Suburban Sky darkness: 5 <Limiting magnitude> Telescope: Takahashi FS102 Magnification: 164x (LE5 eyepiece) – 205x (LV4 eyepiece) – 328 x (LV 2.5 eyepiece) |
The main component appears to be a single star (?) – I’ll try again next time. No coloration registered. | |||
| Dave Mitsky | ||||
| Star:
Otto Struve 111
Date & Time: 1/19/99 02:41 UT Seeing: 6 <1-10 Seeing Scale (10 best)> Transparency: ~ 4 Location of site: ASH Naylor Observatory (http://www.msd.org/obs.htm) near Lewisberry, PA Site classification: Rural Sky darkness: ~ 5.0 <Limiting magnitude> Telescope: 17” f/15 classical Cassegrain Magnification: 118x, 202x, 249x, 381x |
A difficult binary consisting
of 6th and 10th magnitude components separated by 2.6". Some elongation
was seen at 202x. The pair was resolved, but not consistently, at 249x.
Using a magnification of 381x was unproductive. Otto Struve lies some 20'
north of Lambda Orionis (page 180 of the Uranometria 2000.0). No color
was noted.
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| William L. Schart | ||||
| Star:
Otto Struve 111
Date & Time: 12/9/99, 10:31 pm CST Seeing: 8 <1-10 Seeing Scale (10 best)> Location of site: Killeen, TX, USA Site classification: (suburban) Sky darkness: mag 4 Telescope: Orion 6" Dob Magnification: 32x, 48x, 72x, 120x Star: Otto Struve 111 Date & Time: December 28, 2000 9:07 pm CST Seeing: 8 <1-10 Seeing Scale (10 best)> Location of site: Killeen, TX, USA Site classification: (suburban) Sky darkness: mag 4 Telescope: Orion 6" Dob Magnification: 32x, 48x, 72x, 120x, 144x, 240X |
There is a
line of 3 stars visible in the finder. The center is lambda, this is the
fainter of the 2 ends. Again, a very tight pair only a few seconds apart.
One appears yellow and one appears blue: it reminded me of Albireo.
Got a clean split with the barlow at 240X, at 144x could make out the companion intermitantly. Both members appear w to me. Ambience: At first it was cool but not cold, but by the second half of tonight's session, the temperature was approaching the freezing point. Several times the EP would mist over when I inadvertantly breathed on them. Animals, both wild and domestic, remained at home, undoubtedly contentedly asleep.
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| Randall Heckman | ||||
| Star:
Otto Struve 111
Date & Time: 12/30/99 at 2:15 UT Seeing: 3 Location of Site: Heckman Observatory 40 37' 10" N and 99 03' 50" W Site Classification: Rural Sky Darkness (Limiting Magnitude): 4 Telescope: 8" Orion Dob Magnification: 120x |
Separation (Clear or Toughing):
Clear
Magnitude Comment: Secondary substantially dimmer than primary in agreement with the quoted magnitudes. Color Comment: Blue primary and yellow secondary. General Comment: This pair is a fine sight with the indicated color contrast.
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| Richard Harshaw | ||||
| Star:
Otto Struve 111
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): 0440 on 12/31/99 Site classification: suburban Sky conditions: seeing-- 6 out of 10 transparency-- 8 out of 10 limiting visual magnitude-- 5 Temperature: 37 F Telescope: Celestron C-8 Eyepiece: 10mm w/ 2.48x Barlow (496x) |
This pair is
too close to measure with my illuminated reticule Micro-Guide so I can
only report visual impressions.
At 496x, I could not pick the companion out of the glare and Airy disk of the primary so I put my hexagonal diffraction mask over the SCT's corrector plate and, abra-cadabra! The companion popped out bewteen two of the diffraction spokes after I rotated the mask a few degrees. I noted colors of White and Orange (not sure). The pair is believed to be about 1,460 light years away, which would make it as bright as 175,000 Suns! Measurements from 1991:
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| Thad Robosson | ||||
| Star:
Otto Struve 111
Date & Time: 12-30-99, 3:00 to 6:30 UT (12-31-99 UT) Seeing: 4-5 <1-10 Seeing Scale (10 best)> Location of Site: Carbondale, IL, USA Site Classification: Suburban/near rural Sky darkness: 4.7 using "stars counted in the area of" method, (Taurus) <Limiting magnitude> Telescope: 8" f/6 Newt on Dob mount (soon to be split ring :-) Magnification: 174x |
174x On/off
seperation, comp very difficult to spot. no color
noted.
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| Ilario Melandri | ||||
| Star:
Otto
Struve 111
Date & Time: 4/Jan/2000 – 20.1 UTC Seeing: 9 <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: -1C Telescope: 150 mm f/15 achromatic refractor Magnification: 140 x (eyepiece Plossl Clavé 16 mm) |
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| William L. Schart | ||||
| Star:
Otto
Struve 111
Date & Time: 2/24/01 10:05 pm CST Seeing: 6 <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: Celestar 8” SCT Magnification: 78x, 120x, 203x |
I think I made
out a tiny bump on this. Again, by fiddling with the DEC to get the lay
of the land, I estimated PA and my bump is more or less in the right place.
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