Struve 880 

Craig M. Carver
Star: Struve 880 
Date & Time:  11/24/98  0730 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 		 A neat pair of yellowish, equal magnitude 8 stars. 

 
Chuck Layton
Star: Struve 880 
Date & Time: Dec. 23, 1998, 09:15 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:  The primary was yellowish white and the comes was white. 
Other comments:  A close pair but easy to separate.  The primary seems slightly brighter than the comes.

 
Dave Mitsky
Star: Struve 880 
Date & Time: 2/4/99 03:08 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		 A moderately tight pair of white stars that are located to the northeast of a nearly equilateral triangle of field stars.  Struve 880 was split at 118x.  The best view of this esthetically pleasing double was at 202x. 

 
Ilario Melandri
Star: Struve 880 
Date & Time: 13/Dec/1999 – 21.24 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: 5.5  <Limiting magnitude>
Temperature: +1C 
Telescope: 150 mm f/15 achromatic refractor 
Magnification: 140 x (eyepiece Plossl Clavé 16 mm)


 

 
Richard Harshaw
Star: Struve 880 [ADS 4862; SAO 95453] 
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): 0420 on 12/31/99 
Site classification: suburban 
Sky conditions: 
seeing-- 7 out of 10 
transparency-- 8 out of 10 
limiting visual magnitude-- 5 
Temperature: 38 F 
Telescope: Celestron C-8 
Eyepiece: Micro-Guide (160x) with 2.48x Barlow (397x total) 		 I made five sets of measurements with the Micro-Guide illuminated reticule eyepiece and got an average separation of 5.9" at PA 57. (If you want the measurements themselves, reply to this posting.) This pair was difficult to measure because the baseline for determing the PA was 
so short. 

I noted colors of Yellow and Yellow. 

Measurements from 1977: 
9.0m (G5) primary 
9.0m companion, 6.0" at PA 54 (both appear to be fixed) 
 

 
Randall Heckman
Star: Struve 880 
Date & Time: 01/08/00 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): 5 
Telescope:  8" Orion Dob 
Magnification: 120x 		 Separation (Clear or Toughing): Clear 
Magnitude Comment: Equal 
Color Comment: Both stars seemed to be yellowish 
General Comment: A real nice matched pair, my favorite so far in the “33 doubles” list. 
 
 
 
 

 

 
Philippe de Jocas 
Star: Struve 880 
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
 		 Struve 880 took 90x to be well seen (mind you, by that time I was really freezing so I did'nt linger), and also in the ENE, at about 12", and at  2½ time the separation of 880 but SSE, there was a faint double 10/1. 

 
Jim Brownfield
Star: Struve 880   
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: 
 
Star: Struve 880   
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, this is another double that shows up well with the 13" telescope 
 
 
 
 
 
 
 
 
 
 

clearly split at 82x, showed as just touching at 45x

 
Richard Bise
Star: Struve 880 
Date & Time: January/29/2000, 8:30 to 10 PM MST 
Seeing: 6-7 <1-10 Seeing Scale (10 best)> 
Location of site: 20 miles 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 these twins were separated! This one is another good test for me in addition to the famous alpha Hercules. It is near my real world resolving  limit (4 ish with similar mags)  for my back yard. I thought the color was orangish for both. 
 

 

 
John M. Ryan
Star: Struve 880 
Date of Observation: 2/02/00, 21:25UT
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: 167x		 Separation (Clear or Touching) Clean Split: 
Magnitude Comment: Both components appeared of equal magnitude in accoradance with the data. 
Color Comment: Both components appeared white. 
General Comment: This is a very pretty pair in the telescope. I noted the positional angle at about 45 to 50º which is close to the listed PA of 54º 

 
Jay Zimmerman
Star: Struve 880 
Date & Time: 02/09/2000, 0315 
Seeing: 6 <1-10 Seeing Scale (10 best)> 
Location of Site:  Carbondale, IL, USA 
Site Classification: Suburban/near rural 
Temperature: 28°F (-2.22°C) 
Sky darkness: 5.1  <Limiting magnitude> 
Telescope: 97mm, f7 apo 
Magnification: 26.7x, 80x 		 Elongate at 26.7x and cleanly split at 80x. Could probably have been split at about 40x, but I didn't try because of deteriorating sky conditions.  Maybe tomorrow.  This is a nice, small headlight double.  Colors: A = B = white. 

 
Tom Teague
Star: Struve 880 
Date & Time: 2000 February 19, (2315 UT)  
Seeing: 7 <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: 63mm Zeiss Telementor refractor
Magnification: x112, x210 		 I found this pair with great difficulty, and only after a lengthy search.  Beautifully split with averted vision at both powers - slightly better x112.  Both stars appear white to me. 
 

 
Orlon Petterson
Star: Struve 880 
Date & Time: 22 February, 2000, 10:00-10:45 UTC
Seeing: 8-9 <1-10 Seeing Scale (10 best)> 
Location of site: Christchurch, New Zealand 43 deg S
Site classification: Suburban 
Sky darkness: 5 Mag, with a gibbous moon to the east <Limiting magnitude> 
Telescope: C102 f/10 refractor  
Magnification: 27x 50x 133x 		 Identifiable as a double even at low power, easily separated at 50x. Secondary appears slight fainter.  Both appear white in colour. 
 
 
 
 
 

 

 
William L. Schart
Star: Struve 880 
Date & Time: 2/56/99 8:35 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: Orion 6" Dob. 
Magnification: 32x, 48x, 72x, 120x,144x, 240x
 		 After an hour of sometimes fustrating searching, I finally located what I am pretty sure is this pair. I began to suspect splitting at 72x, and at higher powers the split would pop in and out of view. The mag (8) and the close separation I estimate at about the published figure of 5.5. I guestimated a PA of about 60d, which is close to the 56 published. 
 

 
John Clemmer
Star: Struve 880 
Date & Time: March 6/2000 1930 EST  
Seeing: 7, quite steady <1-10 Seeing Scale (10 best)>
Location of site: Priceville, Ontario, Canada
W80 41'41"  N44 10' 40"
Site classification: Rural 
Sky darkness: 6+/10ths 5th mag. if I'm lucky tonight <Limiting magnitude>
Telescope: Televue Pronto
Magnification: 95x 

 

 5xBarlow + 26mm, 95x

 
G.E.O.D.A Group
Star: Struve 880 
Date & Time: 11-III-2000, 18.30-21.30 UT
Seeing: 7 <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 = 8.2; PA = 55