Struve 589 

Paolo Morini
Star: Struve 589 
Date & Time: 17 nov 1998, approx 22 UTC 
Seeing:  4 <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: 4.5  <Limiting magnitude> 
Telescope: Takahashi FS102 
Magnification: 164x (LE5 Tak eyepiece)
The first observing session about this program (17 nov 1998) took place at San Romualdo, a little village in the country near Ravenna – Italy. 
With some friends we were engaged in the observation of Leonid Meteors (only one meteor in the evening, and when I was working bout my telescope and 
looking in the opposite direction). 

My scope was set up on a Vixen GPDX equatorial mount, fitted with digital circles (Vixen Stellar Guide). The scope was paired with my Televue Pronto. 

I thought that it would be more sporting to switch off the digital circles and finding the stars through star-hopping. I have prepared a detailed map for each star 
in the list using SkymapPro and a laser printer. 

Finding the first star, FGW Struve 589, was very tricky but, combining my accessories I found a good solution I think to use for future observations: I fit the 
Pronto with a 32 mm Plossl eyepiece with the Amici prism by Celestron (not very good for planetary observation, but very useful for reading maps at the 
eyepiece, giving right-left and up-down correct vision), so I had a 15x70 finder with 3.3 degree field. 

Now I am working to fit a home-made reticle (with thin copper wire glued on a thin nut) to the field-stop of a 40 mm eyepiece to use for star-hopping. The 
evening was very cold. The sky was clear but with high turbulence and we had the visit of clouds passing by in the second part of the evening. 

About Struve 589, that was very tricky to find through star-hopping but then I find the right way to look for a faint star in the sky - clearly split but faint. 
Coloration white? – too faint to perceive colors 
 

Craig M. Carver
Star: Struve 589 
Date & Time:  11/24/98  0620 UT 
Seeing:  6-7 <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: 4.8-5.0  <Limiting magnitude> 
Telescope: 6" Maksutov 
Magnification: 95x, 190x
This is a close pair of nearly equal mag pale orange stars, just beginning to split at 95x, but seen more clearly at 190x.  There is another nice wide double 1/3 
degree due west, with mag 7.5-8.0 white/blue star and 9.5-10.0 blue companion.  Uranometria marks this as a double star. 

The sky is much steadier and darker than the previous night of observation. 
 


 
Chuck Layton
Star: Struve 589 
Date & Time: Dec. 23, 1998, 08:15 UT 
Seeing:  2 <1-10 Seeing Scale (10 best)> 
Location of site: Tacoma (WA) 
Site classification: --- 
Sky darkness: 3.6  <Limiting magnitude> 
Telescope: 20cm f/6 Eq. Newtonian 
Magnification: 177x 
Observed Colorations of Components:  Primary - blue white, comes - white 
Other comments:  Very close and faint.  Even though both components are listed at the same magnitude, the comes appears a slight bit fainter. 

 


 
Dave Mitsky
Star: Struve 589 
Date & Time:  1/19/99 02:22 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 
A fairly close binary (4.3") just east of the Orion-Taurus border (page 179, Uranometria 2000.0) and about 2 minutes east of an attractive, more widely 
separated binary in Taurus. The components are eight magnitude G5 stars that appeared colorless, i.e. white. 

 
Ilario Melandri
Star: Struve 589  
Date & Time: 13/Dec/1999 – 18.58 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: +2.5C
Telescope: 150 mm f/15 achromatic refractor 
Magnification: 140 x (eyepiece Plossl Clavé 16 mm)


 

 
Randall Heckman
Star:  Struve 589 
Date & Time:  12/26/99 at 2:10 UT 
Seeing: 3 
Location of Site: Heckman Observatory 
40 37' 10" N and 99 03' 50" W 
Site Classification:  Rural 
Limiting Magnitude:  5 
Telescope:  8" Orion Dob 
Magnification:  120 
 
Separation:  Clearly resolved 
Magnitude Comment:  Components of equal magnitude. 
Color Comment:  White or colorless 
General Comment:  Double easy to find and split. 
 

 


 
William L. Schart
Star: Struve 589 
Date & Time: 12/26/99 10:05 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: 4.5 <Limiting magnitude> 
Telescope: Orion 6" Dob. 
Magnification: 32x, 48x, 72x, 98x, 144x 
 
Star: Struve 589 
Date & Time: 1/4/2000 9:58 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: 4.5 <Limiting magnitude> 
Telescope: Orion 6" Dob. 
Magnification: 32x, 48x, 72x, 98x 
Easily split at 32x. Appears in the same field of view as Pi4 Ori. At 72x one appears reddish, the other blue. Separation 35", PA 175 degrees. 
 
 
 
 
 
 
 
 
 
 

Questions were raised about my observation of this pair on 12/26/99. I went back and this time I feel that I have observed the correct pair. Suspected splitting this at $*x, but definately split at 72x. PA 89d, the separation was just equal to one line width on my Celestron micrometer eyepiece. However, nothing in the literature supplied with this gives any information on correlating this to a measurement. Any help out there? 


 
Richard Harshaw
Star: Struve 589 [ADS 3417; SAO 112034] 
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) 
Measured with the Micro-Guide with the Barlow. I took five pairs of measurements for the separation and position angle and got an average of 4.9" at PA 282. These compare favorably with the 1981 measurements on record of 4" and 288 (and decreasing). 

I found that a pair of 4" separation is just about at the practical limit of the MicroGuide for my setup. I would need to get a stronger Barlow to go closer than 4", since the problem is measuring the PA 
accurately with such a short "baseline". 

I noted colors of White for the G5 primary and White for the G5 secondary. This pair has been measured by the Hipparcos satellite to be 139 light years away, which makes it about 1.3 times as bright as the Sun (0.9 and 0.4 for the primary and companion). 

 


 
David Bushard
Star: Struve 589 
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 22mm Panoptic (138x) 
An easy split at this low mag, but close.  no color apparent. 
 

 


 
Thad Robosson
Star: Struve 589 
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: 32x, 60x 
 

 

Notched at 32x, split clean at 60x, Orange w/silvergrey comp. 
 
 
 

 


 
Allen Ginzburg
Star: Struve 589 
Date & Time: 01/03/2000 
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: 104x 

 

Clearly separated, uniform color of blue/white. 
 
 

 


 
Jay Zimmerman
Star: Struve 589 
Date & Time: 0430, 01/14/00 UT 
Seeing: 7 - 8 <1-10 Seeing Scale (10 best)> 
Location of Site:  Carbondale, IL, USA 
Site Classification: Suburban/near rural 
Sky darkness: ~4.2  <Limiting magnitude> 
Telescope: 97mm, f7 apo 
Magnification: 80x 
 
Cleanly split at 80x; much prettier at 107x. Colors: both A and B appeared to be just a bit reddish. Estimated PA = 275 degrees (actual = 288 degrees). 

A tiny, east-west, "headlight" double (looks like dim lights of an old car in the distance - way down in the valley - on a dirt road. 
 
 
 
 
 

 


 
Philippe de Jocas 
Star: Struve 589  
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: 95x
589 was fully resolved at 95x, and noted as both white. On the way to it I had a quick look at Otto Struve  55 about 40' SW of p4 Ori. It is a double of the same general brilliance as Struve 589 but much wider at close to 40" NNE. And the 20' preceding, in Taurus, another one of the same family about  30" SWS. All three make a small row of close to 90' long.

 
Jim Brownfield
Star: Struve 589 
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, 75x 
 

Star: Struve 589 
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: 82x, 128x

split at 47x, 75x for clean separation 
 
 
 
 
 
 
 
 
 
 
 
 

Just touching at 82x, clearly split at 128x


 
John M. Ryan
Star: Struve 589 
Date of Observation: 30/01/00 21UT 
Location of Observation: Ciudad Rodrigo, Salamanca, Spain 
40º 36' N, 6º 32'W, Elev. 800 Meters 
Seeing: 7 to 8. Best so far this new year based on the Luis Arguelles method (0 - 10, 10 best)  
Site classification: Urban
Limiting Mag. (naked eye): 5
Instrument: Meade 8"SCT  
Magnification: 80x,167x
Separation (Clear or Touching):Clear Split 
Magnitude Comment: Both components about equal and seem to agree with the data of Mag 8 
Color Comment: Both components seem to be white 
General Comment: A good double to start out the night, both components of equal magnitude and a separation of 4+ arc. sec. to check out the seeing and the scope. From the easy clear split the scope and the seeing conditions were responding favorably. 

 
Tom Teague
Star: Struve 589  
Date & Time: 2000 February 13 
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: x112, x210
 

Star: Struve 589  
Date & Time: 2000 February 19 (2120 UT)
Seeing: 7/10 <1-10 Seeing Scale (10 best)>.
Location of site: Chester, England (53 11 08N; 02 51 39W)
Site classification: Suburban 
Sky darkness: 3 (Moon just past full) <Limiting magnitude>
Telescope: 63/840 mm Zeiss Telementor refractor
Magnification: x112, x210

Surprisingly difficult, and no wonder - these stars are actually mag 9, not 8, and tonight the Moon is only a few degrees away.  Elongated, but ill-defined x112.  At x210, momentary glimpses of separation with averted vision, but still poorly defined.  I don't think I can honestly count this as a proper split.  Worth revisiting on a dark night.  Dew problems towards the end of this observation. 
 
 
 
 
 
 
 
 

I revisited this pair following my rather unsuccessful observation on 2000 February 13 (above).  Elongated x112.  Definitely resolved (cleanly split) x210 using averted vision, but only for periods of a few seconds at a time.  A difficult pair for this telescope, and near its limit.  Both stars appear white to me.  Difficult to judge which is the brighter, although I suspect it is the following star. 
 


 
Tollefsen Magne 
Star: Struve 589 
Date & Time: February 25, 2000 at 21.15 UT 
Seeing: 6 <1-10 Seeing Scale (10 best)>
Location of site: Skien, South-East of Norway 
Site classification: Suburban 
Sky darkness: 4.6 <Limiting magnitude> 
Telescope: Vixen 120mm 4 elements refractor
Magnification: 353X (Celestron Microguide 
eyepiece, and a TeleVue 5X powermate) 
Separation 4,7 arcsec. Position Angle 275 degrees. 
 

 


 
John Clemmer
Star: Struve 589 
Date & Time: Feb 27/2000 2000 EST  
Seeing: 8, quite good <1-10 Seeing Scale (10 best)>
Location of site: Priceville, Ontario, Canada
W80 41'41"  N44 10' 40"
Site classification: Rural 
Sky darkness: 7/10ths lowest vis. magnitude around 6.1 seen in Orion <Limiting magnitude>
Telescope: 4.5" f26 Kutter Schiefspiegler
Magnification: 70x, 108x (40mm, 26mm eyepieces)
clean w/ 40mm, 26mm, 70x, 108x 

 


 
G.E.O.D.A Group
Star: Struve 589 
Date & Time: 3-III-2000, 19:00-22:00
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: 4.5 <Limiting magnitude> 
Telescope: Meade 10" LX-200 SCT
Magnification: 200x
Published measures are the mean of two observations made from two different observers.

d = 8.8; PA= 273