| Craig M. Carver | ||||
| Star:
Struve 701
Date & Time: December 8, 1998 0430 UT Seeing: 4 <1-10 Seeing Scale (10 best)> Location of site: Madison, WI (Lat 43.07, Long 89.38, Elev. 500 ft) Site classification: Suburban Sky darkness: 4.0-4.3 <Limiting magnitude> Telescope: 6" Maksutov Magnification: 95x |
This is a pale
blue star with a dimmer companion and is situated 3/4 of a degree south
of the fine yellow-orange star 29 Ori. Situated just to the northeast
In
the same field (95x, 0.7 degree FOV) are four nearly evenly spaced stars forming a line that almost points at Struve 701. I could not split the double star located about 1/3 degree north of 701. It is a cold (24 degrees F) evening with haze increasing toward the horizon and a rising 3/4 moon.
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| Chuck Layton | ||||
| Star:
Struve 701
Date & Time: Dec.20, 1998, 08:00 UT Seeing: 4 <1-10 Seeing Scale (10 best)> Location of site: Tacoma (WA) Site classification: --- Sky darkness: 4.4 <Limiting magnitude> Telescope: 20cm f/6 Eq. Newtonian Magnification: 122x |
Observed Colorations of
Components: Primary - white, comes - yellow. Other comments:
Close pair, easily seperated. Nice color contrast.
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| Paolo Morini | ||||
| Star:
Struve 701
Date & Time: 15 Jan 1999, 21:30 UTC Seeing: 6 <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 Tak eyepiece) |
With a white-pale
orange coloration, this double is very easy split pair, main white, 2nd
component pale orange. Clear contrast color.
Beautiful system to look at.
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| Dave Mitsky | ||||
| Star:
Struve 701
Date & Time: 2/4/99 02:18 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, 324x |
This pair of 6th and 8th
magnitude stars was resolved at 118x. The primary appeared to be
blue-white. The best view was at 202x. I also viewed 2 binaries
to
the northwest of Struve 701. |
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| Ilario Melandri | ||||
| Star:
Struve
701
Date & Time: 13/Dec/1999 – 19.35 UTC Seeing: 3 <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: 5.5 <Limiting magnitude> Temperature: +2C Telescope: 150 mm f/15 achromatic refractor Magnification: 140 x (eyepiece Plossl Clavé 16 mm) |
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| Richard Harshaw | ||||
| Star:
Struve 701 [ADS 3978; SAO 132053]
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): Dec 29, 1999 (0200 to 0400 UT) Site classification: suburban Sky conditions: seeing-- began at 8 out of 10, degraded to 6 by 0400 UT transparency-- 8 out of 10 limiting visual magnitude—4.5 Temperature: began at 40F, dropped to 26F by 0400; no wind at first, but a breeze picked up slightly as a front passed by about 0330 UT Telescope: Celestron C-8 Eyepiece: Celestron Micro-Guide (160x), 2.48x Barlow (400x effective magnification) |
This pair was
also measured with the Micro-Guide and the Barlow. The average was 6.5"
at a PA of 140, in close agreement with the 1933 measures of 6" at 140.
I am convinced that for pairs that are at least 4" apart, the MicroGuide
is a viable tool, and much less expensive than a filar micrometer.
I noted colors of white (B8 spectrum) and orange. The Tycho satellite suggests a distance of 493 light years, implying a luminosity of 92 Suns (77 and 15 respectively). The field in this area is particularly rich.
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| David Bushard | ||||
| Star:
Struve 701
Location of site: River Falls, WI (USA) longitude 92, latitude 45N elevation approx 800 ft (246 m) Date of observations: 29 Dec 1999, 8:00 to 11:00 pm local time (CST) Site classification: rural Sky conditions: Seeing: 6 of 10, improving later transparency: 6 of 10 limiting visual magnitude: 5.2 Temperature: 25 F (-3 C), winds light and variable Telescope: Meade 12" LX-200 EC Eyepiece: Televue 9mm Nagler (338x) |
A pretty, white
pair, easily resolved.
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| Randall Heckman | ||||
| Star:
Struve 701
Date & Time: 12/29/99 Seeing: 4.5 Location of Site: Heckman Observatory 40 37' 10" N and 99 03' 50" W Site Classification: Rural Sky Darkness (Limiting Magnitude): 5.5-6 Telescope: 8" Orion Dob with 6" aperture mask Magnification: 71x |
Separation (Clear or Toughing):
Clear
Magnitude Comment: Secondary substantially dimmer Color Comment: Colorless General Comment: Easy to find.
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| Allen Ginzburg | ||||
| Star:
Struve 701
Date & Time: 01/03/2000, 06:05 UTC Seeing: 8 <1-10 Seeing Scale (10 best)> Location of Site: Aptos, CA (USA) Site Classification: Suburban Sky darkness: 4 <Limiting magnitude> Telescope: Meade LX-200 f/10 Magnification: 208x
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Easily visible,
with large brightness difference between primary and
secondary.
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| Giuseppe Bandini | ||||
| Star:
Struve
701
Date & Time: 5/Jan/2000 - 21.02 UTC Seeing: 4 <1-10 Seeing Scale (10 best)> Location of site: Italy, Ravenna, Elevation: 0 m Site classification: urban Sky darkness: --- <Limiting magnitude> Temperature: +1C Telescope: Celestron 8” Magnification: 80 x (eyepiece 25 mm Plossl) |
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| Richard Bise | ||||
| Star:Struve
701
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) |
These were touching at 49X.
At 125X, I got separation. Colors seemed blue and orange at both
magnifications.
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| Jay Zimmerman | ||||
| Star:
Struve 701
Date & Time: 0510 01/14/00 Seeing: 8 <1-10 Seeing Scale (10 best)> Location of Site: Carbondale, IL, USA Site Classification: Suburban/near rural Sky darkness: ~4.2 <Limiting magnitude> Temperature: 22°F (-5.56°C) Telescope: 97mm, f7 apo Magnification: 40x, 53x
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Elongate and
notched (possibly split) at 40x; certainly split at 53x. Colors:
A = blue-white; B = white (pretty small for good color determination).
Est. PA = 135° (actual = 141°).
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| Orlon Petterson | ||||
| Star:
Struve
701
Date & Time: 10:00 - 12:00 UT 20/01/2000 Seeing: 3 <1-10 Seeing Scale (10 best)> Location of site: Christchurch, New Zealand Site classification: Suburban Sky darkness: 5 <Limiting magnitude> Telescope: C102HD f/10 refractor Magnification: 50x, 83x |
Clear night
with a warm light NW breeze, near Full Moon, but with seeing like looking
up from the bottom of a swimming pool. Easy to split at 83x, just
discernible at 50x. White primary, with grey/red colour for the secondary
which was seen to the SE of the primary.
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| Philippe de Jocas | ||||
| Star:
Struve
701
Date & Time: January 22, 1h00-7h300 UT Seeing: 3-4 <1-10 Seeing Scale (10 best)>. Location of site: Ottawa/Hull, Canada Site classification: Suburban Sky darkness: 4.5 <Limiting magnitude> Temperature: -25C Telescope: 6" f5 newtonian Magnification: 90x, 120x |
Struve 701, h2268, and as a bonus, Struve 692 (about 50' NW of å 701). Struve 701, I had observed before and gave it a"!" , was resolved at 90x but better at 120x. Struve 692 makes a pretty appearance at 40x and is reminiscent of Otto Struve 55. | |||
| Bill Becker | ||||
| Star:
Struve 701
Location of site: Casper, Wyoming Elev. 5200' Date of observations: Jan. 24, 2000 4:05 UT Site classification: Suburban Sky conditions: Seeing:4 Sky Darkness: 4.5 Telescope: Vixen 102 FL Magnification: 102x |
I found Struve
701 to the east of Rigel. The primary seen as blue-white, the secondary
seemed blue. There's a string of 3 stars just to the NE of 701.
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| Jim Brownfield | ||||
| Star:
Struve
701
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: 47x Star: Struve 701 Date & Time: 1/29/00, 3:30 UT - 10:00 UT Seeing: ) 3 improving to 4 <1-10 Seeing Scale (10 best)>. Location of site: Huntsburg, Ohio, USA Site classification: Suburban Sky darkness: 4.5 (limiting magnitude) Other observing conditions: 14 degrees F dropping to 6 degrees F, 92% humidity Telescope: Meade 80mm/ f11 Magnification: 45x, 82x |
split at 47x with mask,
then was able to do it without mask
Seen as just touching at 45x, & clearly split at 82x. |
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| William L. Schart | ||||
| Star:
Struve
701
Date & Time: 1/30/00 10:37 pm CST Seeing: 7 <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: 48x, 72x, 98x |
Not split at 48x, cleanly split at 72x. Separation measured at 8”. PA 142d. Returning to 48x, I thought that in moments of good seeing, I could barely split this. | |||
| Daniel Rodríguez | ||||
| Star:
Struve
701
Date & Time: 2/5/2000, 23:25 (UT) Seeing: 7 <1-10 Seeing Scale (10 best)> Location of site: Jerez de la Frontera, Spain, elev. 24 m Site classification: Urban Sky darkness: 4 <Limiting magnitude> Temperature: 11 ºC Telescope: Celestron G8 (8” SCT f/10) Magnification: 50x, 81x, 119x, 203x (Celestron Plossl 40, 17, 10 mm, SMA 25 mm)
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A bit difficult to find due to the poor 6x30 finder and mag. 4 skies. At 50x an “eight figure” is observed, but the pair is splitted at 81x and 119x. Best viewed at 203x (as shown in the picture). Is an easy pair for a C8 even in light polluted skies. However I don’t think it is a striking pair. | |||
| John Clemmer | ||||
| Star:
Struve
701
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: 107x, 26mm eyepiece |
107x/clean | |||
| Bill Reinehr | ||||
| Star:
Struve
701
Date & Time: February 26, 2000, 02:00 UTC Seeing: 8 (pretty still) <1-10 Seeing Scale (10 best)> Location of site: Pflugerville, Texas, USA (30 degrees N.) Site classification: Suburban Sky darkness: 4 <Limiting magnitude> Temperature: 67 F. Telescope: Vixen 80mm Fluorite, f/8 on Custom D altaz mount Magnification: 29x, 58x. |
An easy split
at 58x.
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| G.E.O.D.A Group | ||||
| Star:
Struve 701
Date & Time: 5-III-2000, 19:00-22:00 UT Seeing: 8 <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: 3.5 <Limiting magnitude> Telescope: Meade 10" LX-200 SCT Magnification: 200x |
Published measures
are the mean of two observations made from two different observers.
d = 7.7; PA = 139
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