| Richard Jepeal | ||||
| Star: Struve 1487 Date: March 27, 2006 Time:--- Seeing: --- Transparency: --- Location of site: New Britain, Connecticut USA Site classification: Urban Conditions: ---- Sky darkness: --- Telescope: 8in Celestron Nexstar Eyepieces: --- Magnification: |
I see this as a yellow
pair. Curiously, Webb calls this greenish-white
and blue, while Mullaney says: lovely, little known bluish-white and
greenish-white pair. |
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| Florent Losse | ||||
| Star: Struve 1487 Date: April 13th, 2006 Time: Seeing: 7 of 10 Transparency: good Location of site: 4433N 0012W Site classification: Rural Conditions: Sky darkness: m lim=5 Telescope: Newton 8" at 8.70m m of EFL Imaging device: Audine CCD (KAF400) Imaging software: Pisco Reduction: Reduc v3.62 Visual : 120mm refractor, 7.5 mm and 5mm eyepieces Magnification: 50x |
A piece of
choice to finish. A fair separation, bright and coloured, do
we need more ? The secondary appears frankly blue and the primary pale
yellow. Measurement
: 111°8 / 6"53. |
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| Wolfgang Vollmann | ||||
| Star: Struve 1487 Date: April, 2006 Seeing: --- Transparency: --- Location of site: Vienna, Austria Site classification: Urban Conditions: --- Sky darkness: --- Telescope: 80/880mm refractor, 130/1040mm for imaging Imaging device: Philips ToUCam Magnification: |
Visually
with my old 80/880mm refractor I used as a youngster I noted: "pretty double star, clearly resolved using 50x. Main star is clearly brighter and definitely yellowish-white. The companion is a bit bluer or greyer as the companion but I suspect that this comes from the differing brightness of the components". Using my 130/1040mm refractor and a 3x barlow lens with my Philips ToUCam webcam I measured 54 Leo as follows: Year -- distance -- PA -- nights -- videos 2005,303 -- 6,24" -- 110,0° -- 1 -- 2 2006,290 -- 6,72" -- 112,7° -- 1 -- 8 I have more confidence in my 2006 results since I used much more single images to get them -- usually I need at least 3 or 4 videos to get precise results.  |
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| Axel Tute | ||||
| Star: Struve 1487 Date: 07-04-06 Time: 20:00 UT Seeing: 7 from 10 Transparency: 7 from 10 Location of site: Kuessaberg-Dangstetten / Germany Site classification: Rural Conditions: no wind, 6.9C, humidity 55% Sky darkness: 4mag (full moon) Moon: short before full moon Telescope: Celestron 8 Eyepieces: 26mm Plössel, 12mm RKE Magnification: 77x, 167x Diagonal: Yes |
Split with the 26mm.
Better
with the 12mm RKE. Measured PA = 116.3 - AC = 6.7". PA is to far away
from
the given 111. But why ??? No color observed.
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| Steve Bodin | ||||
| Star: Struve 1487 Date: 27 Apr 2006 Time: 10pm to 11pm Seeing: 4-5/10 Transparency: good Location: Mattawa Wa, USA, 46.7N,119.9W Site classification: Rural Conditions: 60F, slight wind, dry Sky darkness: limiting mag 6.5 Telescope: Meade 16 inch LX200GPS UHTC Eyepieces: not used Imaging: DX8263SL video camera at f10 Magnification: app.600x |
Bright pair,
went to 1/500 sec on the camera, maybe too far, got dim. Cool
white primary, type A1V. Measured;
6.72 sec at 113.0 deg PA. |
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| Dave Jenkins | ||||
| Star: Struve 1487 Date: 10/May/06 Time: Seeing: 6/10 Transparency: Location of site: Orem, Utah - USA Site classification: Suburban Conditions: Heavy light pollution Sky darkness: Moonlit evening Telescope: Nexstar 11 GPS on APT Eq. Mount Eyepieces: 32mm Meade Plossl Camera: Nikon Coolpix @ 4x zoom with 32mm Meade Plossl - Flip Mirror used. Software: Reduc - Thanks Florent! Magnification: Approx. 350x |
Struve 1487 -
6.7” 118º
 |
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| William Schart | ||||
| Star: Struve 1487 Date: 24 Mayl 2006 Time: 10:56 PM Seeing: about 6-7/10 Transparency: clear Location of site: Columbia, USA Site classification: Suburban Sky darkness: --- Telescope: C8 Eyepieces: 25mm, 17mm Magnification: |
Easy split. Quite blue in color. Estimated PA 100 | |||
| Thomas Teague | ||||
| Star: Struve 1487 Date: 2006 May 31 Time: 22:30 UT Seeing: 6/10 Transparency: Location of site: Chester, England Site classification: Suburban Conditions: Sky darkness: Poor (twilight all night at this time of year; poor transparency). Telescope: 50/540 O.G. (the Agnes Clerke refractor) Eyepieces: fixed eyepiece Magnification: x25 |
Ambience: Chilly, still.
No hedgehogs to keep me
company tonight - probably too cold for them. Comments: When
wearing my spectacles (prescribed to
correct my own ocular astigmatism), I could see two tiny discs in
contact, with
a suspicion (unconfirmed) of true separation. I am sure the pair would
be
easily split using a higher power, but x25 it is elongated (in
estimated P.A. 100°)
rather than resolved. Without my spectacles, I find it is still
possible to
detect a trace of elongation, but only because I know exactly where to
look for
it. Overall, my own astigmatism tends to dominate, giving a low
'signal-to-noise ratio' which tends to mask subtle modifications of the
stellar
diffraction pattern. Both components appear pure white to me, but Webb
describes them as greenish-white and blue. Admiral Smyth saw them as
white and
grey. |
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