Struve 262, Iota Cassiopeiae

Carol Lakomiak
Star: Struve 262, Iota Cassiopeiae
Date & Time: July 12-13, 2003
Seeing: 3 [see
Transparency: --- 
Location of site: 45°N // Tomahawk
Site classification: Rural
Temperature: 56°F at 10pm CDT, dropping to
50°F by 3:15am CDT
Sky darkness:  10/10 (Thompson Scale)
Conditions: Not too much dew; extreme
Lunar interference; generally pleasant
Telescope: Meade 8" f/10 LX-10 (Snoopy )
Eyepieces: 32mm, 13.8mm, 9mm, 5mm
Magnification: 63x, 147x, 226x, 406x
63x showed a downward arc of stars, Iota being at the lower left.

147x and 226x both showed 'A' to be yellowish and 'B' as slightly ruddy.
Not as difficult as I imagined, the split was probably helped along by the 
separation and the good seeing.

There's also another star to the right of 'A' seen at 63x, appearing to be 
dimly ruddy.


Luis Balanzino
Star: Struve 262, Iota Cassiopeiae
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
A famous triple system, nice with this scope but subtle and considerably more difficult than Beta Monocerotis, for example. 48x, only the bright white primary with the C component barely visible; 100x, both components clear with the B component very very subtle; 200x, all three components clear. B is difficult because lies in the first diffraction ring. 


Thomas Jensen
Star: Struve 262, Iota Cassiopeiae
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
By now the clouds had almost dissappeared and Cassiopeia risen high 
enough to offer a good view.

Iota Cass was easily resolved at 133x and quite beautiful. The stars were shimmering a bit so the seeing wasn't perfect, but the 80/1200 is remarkably insensitive to bad seeing when observing doubles. Planets is a different story altogether.


Luis Argüelles
Star: Struve 262, Iota Cassiopeiae
Date: 29, July, 2003 , 23:45 -> 2:45 local time
Location of Site: Sena de Luna, Spain
42.55N, 05.57W
Seeing: 8->7 <1-10 Seeing scale (10 best)>
Transparency: 8->7 <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
Diagonal: Zeiss prism diagonal
Magnifications: 91x, 164x, 215x
A really beautiful triple system. Although a bit tight. Since seeing and transparency is rather good, it's very easy to enjoy it with the 9mm Nagler, and it's even better with the 5mm Eudiascopic. Absolutely recommended and one that can be added to  the set of any observer's personal favourites. A very fine and delicate system.


Paolo Morini
Star:Struve 262, Iota Cassiopeiae
Date: 30, July, 2003
Location of Site: Sarsina, Italy
Seeing: 7 <1-10 Seeing scale (10 best)>
Transparency: 7 <1-10 scale (10 best)>
Site classification: Suburban-Rural
Sky darkness: 5.5 <Limiting magnitude> 
Telescope: Takahashi FS-102
Mount: Vixen GP-DX
Eyepieces: 4.8mm Nagler
Magnifications: 170x


Bob Hogeveen
Star: Struve 262, Iota Cassiopeiae
Date: 9, August, 2003 , 00:00 -> 02:30
Location of Site: Eext, The Netherlands
(53N, 06E)
Seeing: 4 <1-10 Seeing scale (10 best)>
Transparency: 7 <1-10 scale (10 best)>
Other conditions: No Moon.
Temperature: 20ºC
Altitude: 1,200 mts (3,940 ft)
Site classification: Rural
Sky darkness: about 5.5
Telescope: Celestron C11
Mount: Losmandy G11
Eyepieces: 40mm Pentax SMC XL,
20mm TV Plossl, 10mm plossl, 5mm LV. 
Magnifications: 70x, 140x, 280x, 560x
Iota was the great surprise and delight of the night!
Not only I noticed that (for some obscure reason) I hadn't observed this double before, but also it turned out to be a real showpiece.
At 70x I saw a bright white star with a subtle little ruddy companion. I notified my companions and we all agreed that this was a very pretty double. Then my companion with the C8 had a look at it with 120x and I noticed in his scope the much more close B-star just at the edge of the bright A. Taking a look with the C11 @ 140x brought out the triple system real wonderful. A bright white A, a yellowish B and the ruddy C.
This double made it to my list of favourites immediately and will appear on my website soon!


Thomas Teague
Star: Struve 262, Iota Cassiopeiae
Date: 2003 August 5 (2245 UT)
Location of Site: Chester, England
[531108N, 025139W]
Seeing: 7-5 <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: x48, x120, x200
x48, seen to be double (wider companion only).  On increasing the power to x120, I spotted the closer companion as well.  Curiously, no single power would show all three components equally well.  The closer star (B) is best seen x200, but at that power the more distant companion (C) becomes surprisingly difficult in these hazy conditions.  The reverse applies x120, at which power C scores at the expense of B.  The primary appears yellow.  Otherwise I could see no colours.  Smyth saw B as lilac and C as "fine blue", a description which agrees with that given by Webb in his Celestial Objects for Common Telescopes.  The colours given by Flammarion were golden yellow, lilac and purple.  May be worth trying again on a clearer and darker night.  A fine triple.

Ambience:  Warm, hazy, after a very hot day.  The buddleias are now past their best, but I moved the telescope further from the house tonight, so as to be able to see as much as possible of Cassiopeia above the roof.  This took me closer to our two honeysuckle climbers, almost as fragrant as the buddleias.


Tim Leese
Star: Struve 262, Iota Cassiopeiae
Date: 24-Aug-2003, 21:30 UT.
Location of Site: Northwich, Cheshire. UK
(53° 15' N -2º 33' W)
Seeing: 5 <1-10 Seeing scale (10 best)>
Transparency:  <1-10 scale (10 best)>
Other conditions: clear sky. 
Site classification: Suburban
Sky darkness: 3.0 ( UMi ) <Limiting magnitude>.
Telescope: 200mm f/6 Newtonian reflector.
Mount: Vixen GP
Eyepieces: 18mm Orthoscopic, 6mm Orthoscopic
Magnifications: X67, X200
18mm Or--------------I found a yellow primary star but could only see the wider blue companion at first. Then, under closer examination and a moment of good seeing the main star went pear shaped and displayed pale yellow with a tip of blue/green.
6mm Or-------------- This higher magnification spit the system into three stars. An unsteady view but with some patience and moments of steady air a beautiful triple star was observed.  HS rating 1
Colours noted were:-
primary--- yellowish
companion at PA 120deg---blue.
companion at PA230deg ---purple.
Note--- STF 262 was observed using my f/15 4inch refractor at     X167 ( 9mm Ortho ) on the 13 July 2003 and again on the 14 Aug 2003 at about 01:30 hrs UT for both dates. I noted a stunning triple star system with a yellow primary, purple for the closer companion and blue for the wider companion. A few very faint stars in the fov, some requiring averted vision to observe them. A classic view for a small refractor.

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