| Richard Harshaw | ||||
| Star: Struve 2737
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): UT: 02:15 of Sept. 16, 2000 Site classification: suburban Sky conditions: seeing-- 4/10 up to 8/10, in short spans of time transparency-- 8 out of 10 limiting visual magnitude-- 5.0 mag Telescope: Celestron C-8 Eyepiece: 20mm (104x) for AC. (It took 697x to split AB.) |
Position: 2059+0418
Magnitudes: 5.3, 5.3, 7.1 Sep/PA's: AB = 1 / 285 -. AC = 10 - / 67 -. Year of last measurement: 1990 Distance (light years): 197 Luminosity (in suns): 51 Eyepiece and magnification: 20mm (104x) for AC. (It took 697x to split AB.) Colors noted: W, W and B. Some observers note W and B; Webb reported Y and yW. Very rich field. It was discovered by Struve in 1835. The orbit takes 101.4 years (van den Bos, 1933). Star A is a spectroscopic binary with a period of 1.0313 days. First measure of AC (discovered by Aitken): 11" @ 78. I rated it 2. |
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| Eddy O'Connor | ||||
| Star: Struve 2737
Date & Time: 8 -10 p.m local; UT +11. Monday, September 18th 2000 Seeing: 5-6 <1-10 Seeing Scale (10 best)> Transparency: 9. No Moon. Temp 18º C. Windy. Location of Site: Terara, New South Wales, Australia, Long.150.38 degrees; South 34.52. Site Classification: Suburban Sky darkness: 4.5 <Limiting magnitude> Instrument: 8" F9 Dobsonian Magnification: 72X (25mm Kellner) |
(Epsilon or 1Equ): This star can , with patience and a
good finder, be located by star-hopping from the Delphinus group but the
most difficult to locate tonight. I failed to split the close companion
of this Light Golden star but the wider C companion was a dainty bluish
colour.
Comments: The closer pair is recommended for X200 power and 8/10" scopes
are required for splitting the AB(mag. 6,7.1) components of this triple
at 0.8" separation;the easier mag 7.3 C component has a separation of 10.7"
and a PA of 70º. The AB pair is closing with periastron occuring in
2021,according to The Observer's Guide. Hartung suggests the orbit of the
close pair is in line of sight with a period of 101 years. A gem of a triple
which honours the Equestrian
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| Patrick J. Anway | ||||
| Star: Struve 2737
Date & Time: Sept. 17, 2000, 11pm EDT (0300 UT) Seeing: 7 <1-10 Seeing Scale (10 best)> Location of Site: Munising Michigan USA Site Classification: Rural Sky darkness: 5.5 (in the holes) <limiting magnitude> Sky condition: high clouds, moon rising Temperature: 42º F (5º C) Telescope: Zeiss 63mm/840mm f/13.3 Eyepieces: 7mm, 10mm, 16mm, 18mm orthos
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Using 10mm for 84X components separated into yellow primary
and blue secondary. Olcott gives white and blue and Smyth gives white and
pale lilac. Discovered by Struve in 1835, the estimated distance of the
group is 200 light years.
I also attempted 4 Vulpecula but was unable to split it and will try
later when more holes appear.
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| Tom Teague | ||||
| Star:
Struve 2737
Date & Time: 2000 September 18 (21:35) Seeing: 6 <1-10 Seeing Scale (10 best)>. Location of site: Chester, England (53 11 08N; 02 51 39W) Site classification: Suburban Sky darkness: 4 <Limiting magnitude> Telescope: 63mm Zeiss Telementor refractor Magnification: x84, x140 |
I don't recall observing this pair in the past. I doubt whether
I could easily have forgotten it if I had, for it's a magnificent double.
An excellent choice by Tim. Easily separated x84, and best seen at
that power. I find the colour of the comes impossible to define,
as it seems to change moment by moment (doubtless a consequence of scintillation).
At times it seems blue, occasionally mauve/lilac, and just once I thought
it might be orange. But the most persistent - undoubtedly subjective
- impression was of green! No estimates of PA or sep, I'm afraid.
Ambience: cold, still, autumnal.
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| Tim Leese | ||||
| Star:
Struve 2737
Date & Time: 20-September-2000 (22:10 UT). Seeing: 6-7 <1-10 Seeing Scale (10 best)> Location of site: Cheshire. UK 53° 15' N –2º 33' W Site classification: Suburban Sky darkness: 3.5 <Limiting magnitude> Telescope: 200mm f/6 Newtonian scope mounted over a Vixen GP mount (manual slow motion). Any Quoted PA or SEP using micro guide. Magnification: X120, X240, X480
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This is another first time observation of this system
for me and, not knowing what to expect, I was pleasantly surprised of what
I found in the steadily decreasing FOVs as I increased the magnification.
Using X120 to start with I observed a very nice double(AB-C) comprising of a yellow/white star with a pale blue/lilac companion at an estimated PA of 70deg. Increasing the magnification to X240 the A/B pair showed some elongation and in moments of steadier air a peanut shape or figure of eight star could be detected. Only in odd moments of steady air and using X480 magnification was I able to split the A/B components of this system. A superb system to observe, then I'm biased as this system was my second Olympian!! Ambience: No wildlife to report tonight except that the stray cat put in a short appearance. Had to take drastic measures to combat the moisture as the air is very damp tonight also. |
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| Ilario Melandri | ||||
| Star:
Struve 2737
Date & Time: 21/9/2000 – 19.20 UT 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: 4.5 <Limiting magnitude> Temperature: +15C Telescope: 150 mm f/15 achromatic refractor (lens by Romano Zen, Venice). Magnification: 250x (Or 9mm) |
Separation is decreasing, it will be 0.5” in 2010, with PA 283. Distance
130.4 light years
The distance between the two components corresponds at 32 Astronomical Units, a bit more than the distance Sun-Neptune |
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| William L. Schart | ||||
| Star:
Struve 2737
Date & Time: 9/25/00 9:33 pm CDT 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, 72x, 98x |
Again, I swept over from Enif until I found Equalus in the finder,
a quadrilateral with one narrow end and one broad end. This pair is off
the broad end. Not split until I reached 72x. I measured the separaation
at 10" and the PA at 250. the primary was again yellow and the secondary
faintly blue, but this could have been a contract effect.
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