Struve 60 (eta Cassiopeiae)

Mike Sutherland
Star: Struve 60
Date & Time: 4 July 2003, 12:40 AM PDT
Seeing: 5-6 <1-10 Seeing Scale (10 best)>. 
Transparency:  OK to good
Location of site: Larch Mountain, OR, USA
Site classification: rural, (4,000 ft elevation)
Sky darkness: 5.5 <Limiting magnitude> 
Conditions: Cool, slight dew
Telescope: Takahashi 102mm, Perspicillum
Eyepieces: 5mm Takahashi LE
Magnification: app. 164x
Found myself fading after all the early morning viewing so went for a rather easy one. I could split this at other powers, but enjoyed the view best in the LE. A bright, yellow-white primary with a dimmer reddish-brown secondary.


Carol Lakomiak
Star: Struve 60
Date & Time: 5th, July, 2003
Seeing: 4-6 <1-10 Seeing Scale (10 best)>. 
Transparency: 4/10 to 8/10 ...varying
Location of site: Suburban
Site classification: USA, 45º Latitude
Sky darkness:  5/10 (Thompson Scale)
Telescope: Meade 8" f/10 LX-10 (Snoopy )
Eyepieces: 32mm, 26mm, 13.8mm,
9mm, 5mm
Magnification: 63x, 78x, 147x, 226x, 406x
A=3.46 very light frothy yellow
B=7.24 dark tangerine... the color of Mars when it's just rising

No need to consult the finder chart for this outstanding pair.
Imagine leaning out of a second story window looking down at a cupcake frosted light-lemon, and a tangerine pea lying next to it.. that's what they looked like. Very nice!! Increasing magnification didn't improve the color but that didn't matter because the lower-power view was preferred.


Steve Bodin 
Star: Struve 60
Date & Time: 7 July 2003 11 pm to 1 am
Seeing: 4 <1-10 Seeing Scale (10 best)>. 
Transparency: fair
Location of site: Silverdale WA, USA
47N 123W
Site classification: suburb-rural
Conditions: temp 50F, damp
Sky darkness: 4.0 due  moon <Limiting magnitude> 
Telescope: Meade 4 inch SCT on ETX mount
Eyepieces: not used
Additional: DX-8263SL video camera at pf
Magnification: app. 150x
One of the favorite sights in Cass. My lack of color palette will only describe the stars as yellow-white primary and small orange-red secondary. The WDS lists a half dozen faint outliers to the main event, but these will remain for another day. Measurement: 13.0 sec at 317.7 deg PA.


Luis Argüelles
Star: Struve 60
Date: 24, July, 2003 , 12:10 -> 2:00 local time
Location of Site: Sena de Luna, Spain
42.55N, 05.57W
Seeing: 9 -> 6 <1-10 Seeing scale (10 best)>
Transparency: 8 -> 5 <1-10 scale (10 best)>
Other conditions: No Moon. 
Altitude: 1,200 mts (3,940 ft)
Site classification: Rural
Sky darkness: about 5.5
Telescope: Takahashi FS-102
Mount: Vixen GP + Skysensor 2000
Eyepieces: 9mm Nagler, 5mm and 3.8mm Eudiascopics. Celestron Ultima 2x Barlow
Diagonal: Zeiss prism diagonal
Magnifications: 91x, 164x, 215x, 328x
A really beautiful double star. It’s rather bright and exhibits a nice white and orangeish colors. A showpiece in Cassiopeia that deserves a place in any “demonstration list” of doubles.


Luis Balanzino
Star: Struve 60
Date & Time: July 28, 2003, 23h to 0h UT 
Seeing: 7 <1-10 Seeing Scale (10 best)>. 
Transparency: 7 <1 worst - 10 best> 
Location of site: Göteborg, Sweden
57°43' N, 11°58' E 
Site classification: Urban area with
considerable light pollution 
Temperature: 20º C
Sky darkness: 4 limited by
twilight  <Limiting magnitude> 
Moon: none
Telescope: Meade ETX-90 Maksutov
(90mm f/13.8) on photo tripod
Eyepieces: 26mm Meade and 12,5mm TAL Plossl, 2x TAL Barlow 
Magnification: 48x, 100x, 200x
Well known binary, is a beautiful and bright object for small telescopes. Primary yellow, the companion looks reddish although the color is difficult to detect with this scope. Easy, well split at 48x.


Thomas Jensen
Star: Struve 60
Date & Time: July 29nth, 
00.15 AM to around 2.20 AM
Seeing: ---
Transparency: --- 
Location of site: Gudhjem, Bornholm
+55deg14min 14deg59min east 
Site classification: Rural
Sky darkness:  10/10
Telescope: 80/1200mm Vixen achromat
Mount: Vixen GP
Eyepieces: Plössl and Orthoscopic 
Magnification: 133x
so easy at 38x that there was little reason to go any higher.


Thomas Teague
Star: Struve 60
Date: 2003 August 5 (2245 UT)
Location of Site: Chester, England
[531108N, 025139W]
Seeing: 7 <1-10 Seeing scale (10 best)>
Transparency:  <1-10 scale (10 best)>
Other conditions
Site classification: Suburban
Sky darkness: Poor (astronomical twilight)
Telescope: Zeiss AS-80/1200 refractor
Magnifications: x80, x120, x240
Easy at all powers.  Exquisite x120.  Yellow and purple.  Discovered by Sir William Herschel.  The colour of the companion has always interested me.  I have examined this pair in several apertures since 1984, reflectors as well as refractors, and I nearly always see the colour of the secondary star differently.  Tonight's view reminds me strongly of the first time I ever saw this pair, back in the 1980s, when I used a Japanese 3-inch refractor.  Now, as then, I see the comes as a deep purple.

Admiral Smyth also has the companion as purple, although he described the primary as "pale white", whatever that may mean.  In fact, the main component appears quite a deep yellow hue.  According to Flammarion, the pair is yellow and lilac.  Webb saw it exactly as I do, namely yellow and purple.  He also reports the descriptions of several other observers.  Most saw the companion as one shade or other or red.  Probably inadequate aperture explains why those of us who use small telescopes see it as purple - a spectral impossibility.

This is one of my favourite doubles, a grand sight in any telescope.

Ambience:  Warm, still.  The night air fragrant with the scent of our two flowering buddleia bushes.

Tim Leese
Star: Struve 60
Date: 24-Aug-2003, 22:30 UT
Location of Site: Northwich, Cheshire. UK
(53° 15' N -2º 33' W)
Seeing: 6 <1-10 Seeing scale (10 best)>
Transparency:  <1-10 scale (10 best)>
Other conditions: clear sky. 
Site classification: Suburban
Sky darkness: 4.3 ( UMi ) <Limiting magnitude>.
Telescope: 200mm f/6 Newtonian reflector.
Mount: Vixen GP
Eyepieces: 18mm Orthoscopic,  CMG and X3 barlow
Magnifications: X67, X96, X322
18 mm Ortho----------------This looked to be a very nice double star at this magnification ( X67 ). The primary appeared to be yellowish with a dull orange companion. A nice view with some fainter stars scattered throughout the fov. HS rating 1
Note-------I observed this project double on 13 July 2003 at 01:10 hrs UT using my f/15 4inch refractor at X167( 9mm Ortho ).  I noted the colours of the pair to be pale yellow and pale orange. A few faint stars were noted to appear, and then disappear, from view due to high drifting haze. One to return to under darker sky, with better conditions.
Measures: ( Drift method )
From an average of 15 transits, A-B had a position angle of 318 degrees.  The separation was much more difficult to determine but was estimated to be 13.5 arc seconds.

Due to a light breeze blowing up from time to time, I used a reflector tonight. Sitting waiting for it to reach ambient temperature, in the fading light, gave me an opportunity to observe a 
splendid aerobatic display from our resident team of bats.  They seem to be on a high tonight swerving and navigating obstacles with great skill. At times, they appear to fly in formation eagerly snapping up any insects they can find. 


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