| Luis Argüelles | ||||
| Star:
Struve 747
Date & Time: November, 21st, 1998 - 22:30 UT Seeing: 3 <1-10 Seeing Scale (10 best)> Location of site: Alto del Fumeru (Smoking Hill) - Spain. (Lat 43.23 N, 5.51W, Elev 1500 ft) Site classification: >Rural Sky darkness: 5-5.5 <Limiting magnitude> Telescope: Televue Ranger refractor. Magnification: 24x |
The weather is freezing and the wind makes the cold-sensation in the "sub-zero" celsius temperatures. While observing M42 at 24x, I note Iota Orionis and Struve 747. I have not much time for observe it, but it's really an easy to split double star. In fact I think it can be splitted with only a good pair of binoculars. I think both components are blue. | |||
| Paolo Morini | ||||
| Star:
Struve 747
Date & Time: 07 Dec 1998, approx 22 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: 52x (15.4 Swarovski eyepiece) - 164x (LE5 eyepiece) Star: Struve 747
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In the same field of Iota
at 52x, very easy to locate. Respect to the main pair of Iota is very “insipid”.
Coloration white-white.
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| Chuck Layton | ||||
| Star:
Struve
747
Date of Observation: Jan. 11, 1999 Time of Observation: 0600 UT Seeing (1 - 10, 10 best): 5 Site classification: Suburban Limiting Mag. (naked eye): 4.8 Instrument Used: 20cm f/6 Eq. Newtonian Magnifications Used: 177X |
Observed Colorations
of Components: Both components appear white.
Other comments: Two well spaced component with similar magnitudes. In the same dazzling field as iota. |
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| Dave Mitsky | ||||
| Star:
Struve 747
Date & Time: 2/4/99 02:35 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 |
A widely separated pair
of fairly evenly matched (magnitudes 5.5 and 6.5) white stars that were
within the field of view of Iota. This double was easily split
at
118x and has a northwestern orientation. |
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| Ilario Melandri | ||||
| Star:
Struve
747
Date & Time: 6/Dec/1999 – 22.19 UTC 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: -0.5C Telescope: 150 mm f/15 achromatic refractor Magnification: 250x (Othoscopic eyepiece 9 mm) |
 |
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| Randall Heckman | ||||
| Star:
Struve 747
Date & Time: 12/29/99 at 2:30 UT Seeing: 4 Location of Site: Heckman Observatory 40 37' 10" N and 99 03' 50" W Site Classification: Rural Sky Darkness (Limiting Magnitude): 5.5 Telescope: 8" Orion Dob with 6" aperture mask Magnification: 46x |
Separation (Clear or Toughing):
Clear
Magnitude Comment: Secondary slightly dimmer Color Comment: Colorless General Comment: Wide pair that was easy to find.
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| Richard Harshaw | ||||
| Star:
Struve 747 [ADS 4182; SAO 132301]
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): 0150 of 12-30-99 Site classification: suburban Sky conditions: seeing-- 5 out of 10 transparency-- 8 out of 10 limiting visual magnitude—5 Temperature: 44 F, moderate breeze Telescope: Celestron C-8 Eyepiece: Celestron Micro-Guide (160x) |
I made five
pairs of separation and PA measures using the Micro-Guide and got an average
of 36" in PA 227.
This is a fantastic field for viewing and STF 747 is a simply gorgeous pair! I noted both as White. The star is a member of the Ori OB1 Association. Hipparchos/Tycho data show different distances for these stars; they may be an optical system. Measurements of 1924:
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| Tomás Vazquez | ||||
| Star:
Struve 747 (also ST 745 on image)
Date & Time: 4/1/2000, 20:35:16 TU Seeing: 4 <1-10 Seeing Scale (10 best)> Location of site: 37 24 N. 5 58 W. Sevilla, Spain Site classification: Urban Sky darkness: 3 <Limiting magnitude> Telescope: Celestron C8” D:203mm. f/6,3 Magnification: CCD Camera
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Observation method: CCD
Camera.
Integration time: 18 seconds Reading CCD software: LUCAS 1.1 Treatment software: LAIA 3.1g Image Position: North up, East left. ST 747 is easy to split. The main component shines at manitude 4.8 and 36” apart and with a PA of 223º appears the secondary. Both are of an intense blue color located in a rich field. In the image you can observe several stars around Struve 747. You can count up to 11 in the small CCD surface of only 2.6x2.6 mm. Also, there is a really faint star in the image located aproximately the same distance that te secondary, but with a PA of 90 degrees. After consulting the Digital Sky Survey for that area I couls identify every star in the image except this small star. I made several exposures along three nights with different exposure times and I didn’t detect any variation both in distance and PA. In the same image and located
west, we appreciate another fainter double, Struve 745. The main component
shines at manitude 9.2 and 28” apart and with a PA of 350º appears
the secondary. Only the great difference in magnitudes from Struve
747 and 745 make us immediately to realice that these systems would never
be a double-double system. The Struve 745 secondary could be a variable
star.
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| Giuseppe Bandini | ||||
| Star:
Struve
747
Date & Time: 5/Jan/2000 - Seeing: 4 <1-10 Seeing Scale (10 best)> Location of site: Italy, Ravenna, Elevation: 0 m Site classification: urban Sky darkness: --- <Limiting magnitude> Temperature: +1.5C Telescope: Celestron 8” Magnification: 80x (eyepiece 25 mm Plossl) |
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| Bill Becker | ||||
| Star:
Struve 747
Location of site: Casper, Wyoming Elev. 5200' Date of observations: Jan.6,2000 5:35UT Site classification: --- Sky conditions: Seeing: 4 Transp.: 4.5 Telescope: Quantum 4 Maksutov Magnification: 85x & 149x |
Another wide
pair of white stars; separation roughly have as wide as struve 761
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| Richard Bise | ||||
| Star:Struve
747
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 (25mm Meade Plössls) |
At 49X both members seemed white to me | |||
| Penny Fisher | ||||
| Star:
Struve
747
Date & Time: January 10th, 2000. About 9 p.m. ET (local time) Seeing: 6 <1-10 Seeing Scale (10 best)> Location of site: Englishtown NJ, 40.25 N 74.333 W Site classification: Suburban Sky darkness: Dark, no moon Telescope: 8 inch Dob Magnification: 80x (15 mm Televue Plossl eyepiece)
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Under very dark and quite steady skies, Struve 747 appeared to be an exactly matched double of almost the same faint magnitude, both of the components appearing a faint blue-white. | |||
| William L. Schart | ||||
| Star:
Struve
747
Date & Time: 1/12/00 9:13 pm CST 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: 98x Star: Struve 747 Date & Time: 1/17/00 7:47 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: 3 <Limiting magnitude>, Moon near full and near object Telescope: Orion 6" Dob with modified Quickcam Magnification: --- 
(Double exposure in order to obtain Separation & PA) |
A bright and
wide spaced pair near iota, in fact visible in the same high power FOV.
Separation 32”, PA = 220
Amazingly enough, the time
this was taken was 7:47 pm! And this was not planned.
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| Orlon Petterson | ||||
| Star:
Struve
747
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. Nearly equally bright
pair with secondary to SW and a fainter star to the north.
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| Philippe de Jocas | ||||
| Star:
Struve
747
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 |
747 and iota Ori together make for a very nice field at 90x (42' with my 19mm lens), being so dominated by those hot blue /white stars. In this case the 11mag. companion to i Ori was no problem at all. | |||
| Jim Brownfield | ||||
| Star:
Struve
747
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 747 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: 28x |
split at 47x
split at 28x
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| John M. Ryan | ||||
| Star:
Struve
747
Date of Observation: 2/02/00, 22;00UT Location of Observation: Ciudad Rodrigo, Salamanca, Spain 40º 36' N, 6º 32'W, Elev. 800 Meters Seeing: 6 to 7, fog began to degrade seeing (1 - 10, 10 best) Site classification: Urban Limiting Mag. (naked eye): 5 Instrument: Meade 8"SCT Magnification: 100x |
Separation (Clear or Touching):Clean
split
Magnitude Comment:Both components seemed about iqual magnitude. Data shows 5.5 & 6.5 Color Comment: Components appeared pale blue. General Comment: When both components are about equal magnitude there would be a problem to determine which would be the primary to determine the positional angle. In this case there is a definite primary but in cases of almost equal magnitues it would be dificult for an amatuer to determine the primary to find the positional angle. My guess of the PA did not agree with the listed of 223º. |
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| Bill Reinehr | ||||
| Star:
Struve
747
Date & Time: February 3, 2000, 03:00 UTC Seeing: 7 <1-10 Seeing Scale (10 best)> Location of site: Pflugerville, Texas, USA (30 degrees N.) Site classification: Suburban Sky darkness: 4 <Limiting magnitude> Temperature: 42 F Telescope: Vixen 80mm Fluorite, f/8 on Custom D altaz mount Magnification: 29x |
An easy split
at 29x.
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| Jay Zimmerman | ||||
| Star:
Struve 747
Date & Time: 02/08/2000, 0315 UT Seeing: 8 <1-10 Seeing Scale (10 best)> Location of Site: Carbondale, IL, USA Site Classification: Suburban/near rural Temperature: 30°F (-1.11°C) Sky darkness: 5.3 <Limiting magnitude> Telescope: 97mm, f7 apo Magnification: 13.3x
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Clean split
at lowest power. PA estimated = 210° (actual = 223°).
Good colors here: A = pale yellow; B = yellowish white. A nice wide double
- you gotta love 'em like this.
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| Tom Teague | ||||
| Star:
Struve
747
Date & Time: 2000 February 13, 2050 UT Seeing: 7/10 (8/10 at zenith) <1-10 Seeing Scale (10 best)>. Location of site: Chester, England (53 11 08N; 02 51 39W) Site classification: Suburban Sky darkness: 4 (Moon just past first quarter) <Limiting magnitude> Telescope: 63/840 mm Zeiss Telementor refractor Magnification: x56, x112 |
Wide, easy pair. Both
white x56. There is a fainter star (mag 7-8?) about 1 arc minute
north. x112, pale yellow and white.
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| Jordi Viver | ||||
| Star:
Struve 747
Date & Time: 19/02/2000, 08:30 UT Seeing: 6 <1-10 Seeing Scale (10 best)> Location of Site: Vic (Spain) 41º55’N, 2º19’E Elev. 570m Site Classification: Suburban Sky darkness: 4.62 <Limiting magnitude> Temperature: 7ºC Telescope: Celestron C8 Magnification: 162x |
Separation:
Very easy double. There are another double at 3.5’ (Struve 745)
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| Tim Leese | ||||
| Star:
Struve
747
Date & Time: 19-Feb-2000, 1900-2330 UT. Seeing: 5/6 <1-10 Seeing Scale (10 best)> Location of site: Cheshire. UK Site classification: Suburban Sky darkness: 3 <Limiting magnitude> Conditions: High haze, very cold and frosty, sky clearing later but full moon. Telescope: 200mm f/6 Newtonian scope mounted over a Vixen GP mount (manual slow motion). Magnification: x96 |
Estimated PA
222. Observe wide pair of stars in same field of view S of Iota.
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| G.E.O.D.A Group | ||||
| Star:
Struve 747
Date & Time: 8-III-2000, 19:00-21:00UT Seeing: 6.5 <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: 4 <Limiting magnitude> Telescope: Meade 10" LX-200 SCT Magnification: 200x |
Published measures
are the mean of two observations made from two different observers.
d = 43.3; PA = 225
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