| Dominik Elsässer | ||||
| Star:
Struve 757
Date: 05.01.99, 21.12-22.05 UT Seeing: 9 Sky Darkness: 4.3 (moonlight) Location: Kleinkahl, Germany Site Classification: Rural Telescope: Vixen 102M Magnification: 50x-250x |
This is a quadruple system.
The three wider stars (~45" and 51") form a small arrow and can be resolved
at almost any magnification. One of this stars is again a very close pair
( 1.5"). This, although relatively dim, was split at 250x. No coloration
observed.
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| Chuck Layton | ||||
| Star:
Struve 757
Date of Observation: Jan. 11, 1999 Time of Observation: 0500 UT Seeing (1 - 10, 10 best): 5 Site classification: Suburban Limiting Mag. (naked eye): 4.8 Instrument: 20cm f/6 Eq. Newtonian Magnification: 177X, 271X |
Observed Colorations of
Components: All components appear white.
Other comments: Very close pair that was hard to split initially. The secondary appears slightly fainter than the primary while the C component some distance off appears fainter still. |
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| Dave Mitsky | ||||
| Star:
Struve 757
Date & Time: 2/4/99 02:47 UT Seeing: 6 <1-10 Seeing Scale (10 best) Transparency: ~ 6 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 |
Struve 757 was another pleasant
surprise. An evenly matched trio of 8th magnitude luminaries that
somewhat resembled Struve 761 some 2 degrees to the
south. All the stars in this stellar triangle appeared to be white. |
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| Randall Heckman | ||||
| Star:
Struve 757
Date & Time: 12/30/99 at 3:05 UT Seeing: 6 Location of Site: Heckman Observatory 40 37' 10" N and 99 03' 50" W Site Classification: Rural Sky Darkness (Limiting Magnitude): 3 Telescope: 8" Orion Dob with 6" aperture mask. Magnification: 160x |
Separation (Clear or Toughing):
Clear
Magnitude Comment: All seemed to be of approximately the same magnitude. Color Comment: White General Comment: I would have had difficulty with the close secondary if the hazy conditions had not improved the seeing.
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| Richard Harshaw | ||||
| Star:
Struve 757 [ADS 4234; HD 37371; AC is STF 758]
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): 0500 on 12/31/99 Site classification: suburban Sky conditions: seeing-- 6 out of 10, but rapidly degrading transparency-- 6 out of 10, rapidly degrading limiting visual magnitude—4.5 Temperature: 42F, rapidly developing high-altitude haze Telescope: Celestron C-8 Eyepiece: Celestron Micro-Guide (160x) Star: Struve 757 [ADS
4234; HD 37371; AC is STF 758]
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I made five
pairs of separation and PA measures for the AC pair using the Micro-Guide
and got an average of 52" in PA 89. (If you'd like the actual measurements,
reply to this post.)
I noted colors of White and bluish-White for A and C. I could only glimpse B on rare occasions-- normally AB was a peanut, with only brief glimpses of black between the two stars. I would say B looked orangish to me. The field here is very, very rich. The 1943 measurements are:
The AB pair was too close
to measure with the Micro-Guide, so I could
I estimated colors of white, orangish-white, and bluish-white for the three stars. The B star was extremely difficult due to the poor seeing. I normally got just a peanut shape with momentary views of black sky between the two stars.
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| Thad Robosson | ||||
| Star:
Struve 757
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
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174x the 1.6"
pair split, the other comp very easy at lesser mag
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| Ilario Melandri | ||||
| Star:
Struve
757
Date & Time: 4/Jan/2000 – 21.02 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: 250x (Othoscopic eyepiece 9 mm) |
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| Richard Bise | ||||
| Star:Struve
757
Date & Time: January/7,8/2000 Seeing: 5 <1-10 Seeing Scale (10 best)> Location of site: 20 NW of Tucson Az 32.884N -110.979W Site classification: Suburban Sky darkness: 4 <Limiting magnitude> Telescope: 10 inch Meade Dobsonian Magnification: 49x, 125x (25mm Meade and 9.7mm Plössls) |
At 49X, I thought
i saw yellow for both members, but I noticed blue and blue white
also reported
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| Bill Becker | ||||
| Star:
Struve 757
Location of site: Casper, Wyoming Elev. 5200' Date of observations: Jan 15th 2000 6:15 UT Site classification: Suburban Seeing: 4 Limiting manitude: 4.5 Telescope: Quantum 4 Maksutov Magnification: 85x, 170x, 297x |
It took me
a while to locate the proper field. Split the primary and the 52" distant
companion easily, with blue to blue-white being the colors I observed.
During moments of steady seeing, the primary appeared elongated. Just to
verify that I have the right field, there is a star of same magnitude about
5 or 6' to s.w. from Struve 757, pa about 225*. Is this correct or was
I temporarily lost in space. ;^)
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| Jordi Viver | ||||
| Star:
Struve 757
Date & Time: 23/01/2000, 24:30 UT Seeing: 7 <1-10 Seeing Scale (10 best)> Location of Site: Vic (Spain) 41º55’N, 2º19’E Elev. 570m Site Classification: Suburban Sky darkness: 5.09 <Limiting magnitude> Temperature: -3ºC Telescope: 200mm self-made Newton, Dobsonian Magnification: 48x |
Separation:
I separe tree components.
Color coments: All are white color. Catalog data: Guide 7.0: vM 7.79, 8.47, 8.64 D(A-B)41.7”, D(A-C)51.1”, PA(A-B)79.4º,PA(A-C)87.4º General coments: Easy localization. Very nice asterism.
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| John M. Ryan | ||||
| Star:
Struve
757
Date of Observation: 24/1/00 23:00UT Location of Observation: Ciudad Rodrigo, Salamanca, Spain 40º 36' N, 6º 32'W, Elev. 800 Meters Seeing: 5 (1 - 10, 10 best) Site classification: Urban Limiting Mag. (naked eye): 4 Instrument: TeleVue 101 Apo refractor Magnification: 30x, 60x, 180x |
Separation (Clear or Touching):
Clear
Magnitude Comment: All three components appear about equal mag. in acordance with the data. Color Comment: All components appeared white General Comment: Split wider pair at 30X with just a hint of the separation of the two close componets. Clean split of all three at 60X. At 180X the close pair were clearer. Nice but Eta and 31Ori are more interesting.
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| Jim Brownfield | ||||
| Star:
Struve
757
Date & Time: 26/01/2000, 6:30 p.m.- 11:30 p.m. EST Seeing: 3 – 5 (improving) <1-10 Seeing Scale (10 best)>. Location of site: Huntsburg, Ohio, USA Site classification: Suburban Sky darkness: 6 mag., could see ST 855, going to 5th mag. star Rho <Limiting magnitude> Other observing conditions: 83% humidity, 16 degrees F. with 12" snow on ground going to 84% humidity, 4 degrees F. Telescope: 13.1"/F4.5 Dobsonian, with 5" aperture mask for the brighter pairs Magnification: 140x Star: Struve 757
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split all at 140x with mask
pair ab ( 1.6") unresolved up to 187x,stars c 8.9 mag & d 8.8 mag with 11" sep.from each other showed as just touching each other at 45x, & clearly split at 82x with stars ab 40" away |
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| John Clemmer | ||||
| Star:
Struve
757
Date & Time: Feb 7/200, 2100 EST Seeing: 6, a bit bouncy <1-10 Seeing Scale (10 best)> Location of site: Priceville, Ontario, Canada W80 41'41" N44 10' 40" Site classification: Rural Sky darkness: didn't check lowest vis. magnitude. best would be circa 6.2 <Limiting magnitude> Temperature: -15C Telescope: 4.5" f26 Kutter Schiefspiegler Magnification: 160x (17mm eyepiece) |
160x/ clean...Note: this
is actually 4 stars, the 4th is mag 8.8 and just below the 8.9 @51.6" component.
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| Jay Zimmerman | ||||
| Star:
Struve 757
Date & Time: 03/07/00, 0300 UT Seeing: 6-7 <1-10 Seeing Scale (10 best)> Location of Site: Carbondale, IL, USA Site Classification: Suburban/near rural Sky darkness: 5.9 <Limiting magnitude> Temperature: 57°F (14°C) Telescope: 97mm, f7 apo Magnification: 13.3x, 26.7x |
This is a quadruple
masquerading as a triple. I was unable to split the close (1.6") AB pair
at any power that ambient conditions permitted. The AB-C split (51.8")
was easy at 13.3x. The C member, however, is a wide (11.1") double that
carries the independent designation STF 758 and was split at 26.7x.
I assume that STF 757/STF
758 comprise a double-double with three interacting centers of mass - or
whatever. When I first looked at this system it all seemed so easy. I mistook
STF 758 for the close STF 757 AB pair and also mistook STF 757 AB for STF
757 C (not knowing then that C, itself, is a double). But the PAs and the
separations seemed to be in the wrong order so, luckily, I didn't report
that observation. This thing should come with warning labels.
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| G.E.O.D.A Group | ||||
| Star:
Struve 757
Date & Time: 10-III-2000, 19:00-21:00 UT Seeing: 7.5 <1-10 Seeing Scale (10 best)> Location of Site: Manises, Valencia, Spain. GPS coordinates: 39º 29' 36" N, 00º 27' 56" W. Site Classification: Urban-Suburban Sky darkness: 3 <Limiting magnitude> Telescope: Meade 10" LX-200 SCT Magnification: 200x |
Published measures
are the mean of two observations made from two different observers.
d = 2.2-47.6; PA = 243-77
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