Struve 2797

Richard Harshaw 
Star: Struve 2797
Date & Time: September 5, 2001,
0230 to 0510 UT
Seeing: 6 <1-10 Seeing Scale (10 best)>
Transparncy: 6 to 7 (variable, due to high hazy clouds) <1-10 Seeing Scale (10 best)>
Location of site: Northern Kansas City,
Missouri (USA). 39º15' N, 94º30'W
980 ft above Mean Sea Level
Site classification: suburban 
Sky darkness: -- <Limiting magnitude>
Telescope: Celestron C-8m C-11
Magnification: 112x, 207x, 311x
Harshaw Scale: 3 <1-5; 1 best>
HD Number 204215
ADS 14977
Position:  2127+1341  Rating:  3
 A:  7.1m, A2
 B:  8.8m, 4 +” @ 216 - 
Year of last AB Measure:  1965
Distance (l.y.): 750, Luminosity (Suns): 73
Observed colors:  W, B 

Observations: C8:  Observed at 207x.  Webb saw them as W and W.
C11: Observed at 112x.  It looked better, however, at 311x.

Notes: The primary is a Beta Lyrae system.
First measure 3.2" @ 217.


John Ryan
Star: Struve 2797
Date & Time: 6 Sept 2001 ( 21:00 UT)
Seeing: 4+ <1-10 Seeing Scale (10 best)>
Location of site: Barreras, Salamanca, Spain.
Site classification: Rural, Suburban.
Conditions: moon 3 days past full , fairly dry but with gusts of wind.
Sky darkness: 3+ <Limiting magnitude> much light due to moon
Telescope: Meade 8" SCT mounted on a Losmandy GM8.
Eyepieces: 20mm plossl,17mm plossl 
Magnification: 100X, 118X 
Harshaw Scale: 3 <1-5; 1 best>
Another challenge of a 3" double with bad seeing. Split at 100X and not much better at 118X. The split was cycling in and out of view. Primary whitish-blue, secondary whitish grey.

Ambience: The night was clear but with the moon lighting everything up it made double stars more worthwhile. However it looked like another night of bad seeing like it was two nights before when I had the 4" refractor out looking for doubles in Pegasus. Tonight I decided to go with the Meade 8" SCT to see how it would compare to the 4" refractor in another night of bad seeing. I reported on STF 2804 with the refractor so I decided to see how it would do with the 8" SCT. STF 2804 has a separation of about 3" and I was able to split it with the SCT at 100X and at 118X but the view was almost identical as it was two nights before in the refractor. I went up to 167X and the view turned into oatmeal mush. As is well known with poor or bad seeing the larger scopes lose their advantage againt the smaller scopes.

Stuart Clough
Star: Struve 2797
Date & Time: 8th September 2001. 2015UT
Seeing: 3-4 <1-10 Seeing Scale (10 best)>
Location of site: Near Halifax West Yorkshire, England.
Site classification: Suburban
Conditions: Clear sky, fresh NNW'ly breeze
Temperature: 8C 
Sky darkness: 4.8 <Limiting magnitude>
Telescope: Orion Optics UK GX250 10"  f4.8 Newtonian on Vixen GP mount.
Eyepieces: 20mm Plossl, 9mm Ortho, 7.5mm Plossl.
Magnification: x60, x133, x160
Suspected split at x60, confirmed at x133, best at x160 in the best 
moments of seeing. Tried higher power, but in the conditions this was 
useless. I am told that there has been considerable turbulence very 
high in the atmosphere these last days (and nights)

Primary seen as yellow whilst the comes showed a blue tinge.

Ambience: My first chance of getting to grips with the Winged Horse came on 8th 
September.  Some  late observation reports follow. 

The sky was almost completely clear as I set up and terrestrial 
visibility in early twilight suggested that the limiting magnitude 
might be quite good for my suburban site. A bit ominously though, the 
early stars were twinkling conasiderably.

Doubts about the seeing were confirmed when I used Gamma And. To 
check the finder alignment - an excuse, if one were needed, to enjoy. 
this superb object yet again. In Pegasus, M15 demonstrated that to 
attempt to use more than  x160 would be a waste of time this session. 
Later enquiry elicited the fact that at the time there was 
considerable turbulence very high in the atmosphere.

There was shelter from the fresh NNW'ly breeze in the  back yard but 
a woolly hat and gloves were in order for the first time as autumn 
makes itself felt.

About 2300 local time a large patch of drifting cloud covered much of 
Pegasus and 3 Pegasi, the next target, was demurely disappearing 
behind a neighbour's tree. Time to go indoors after first enjoying a 
few DSO's on the other side of the sky. 

William Schart
Star: Struve 2797
Date & Time: 9/29/01
from 8:12 to 9:15 pm CDT
Seeing: 6 <1-10 Seeing Scale (10 best)>
Transparncy:  <1-10 Seeing Scale (10 best)>
Location of site: Killeen, TX, USA
Site classification: Suburban
Sky darkness: 3.5 <Limiting magnitude>
Telescope: Celestron C8
Magnification: 80x, 160x (CMG), 200x
A fairly tight pair, but still cleanly split at low power. The pair appeared slightly blue to me. At high power, they looked like a pair of blue headlights in the distance, with one slightly but noticeably dimmer than the other.


Bob Hogeveen
Star: Struve 2797
Date & Time: October 8, 2001 
Seeing: Varying from 3 to 5 <1-10 Seeing Scale (10 best)>
Transparncy: 7 to 8 <1-10 Seeing Scale (10 best)>
Location of site: Annen, The Netherlands (53N, 6E)
Site classification: Village backyard 
Sky darkness: ~5 <Limiting magnitude>
Telescope: Celestron C11 
Magnification: 97x, 187x, 280x 
Harshaw Scale: 3 <1-5; 1 best> 
A clear split at 97x. The observation showed white and yellowish as colors. Checking the observation of other I started to doubt the yellow color of B. Using 187x and 280x all resulted in the same conclusion: B is yellowish (I cannot help it, but I can check it out again another time...)


Jim Phillips
Star: Struve 2797
Date & Time: Oct. 8, 2001
Seeing: 6-7 <1-10 Seeing Scale (10 best)>
Transparency: 6 <1-10 Seeing Scale (10 best)>
Location of site: Hodges, South Carolina, USA
Site classification: Suburban
Sky darkness:  <Limiting magnitude>
Temperature: 45ºF
Telescope: Astrphysics 155 F/7 Apo
Magnification: 181x
White, purplish. 181X


Eddy O’connor
Star: Struve 2797
Date & Time: October 14th  2001
8-9.30 p.m local; UT +9
Seeing: 7 <1-10 Seeing Scale (10 best)>
Transparency: 8 <1-10 Seeing Scale (10 best)>
Location of site: Terara, New South Wales, Australia
34º52S, 150º.38E
Site classification: Suburban - Rural
Temperature: 18ºC
Sky darkness: 5 - 5.5, No Moon <Limiting magnitude>
Telescope: 8" Newt. F9
Eyepieces: 25mm K, 12.5 mm Ortho
Magnification: 73x, 146x
Harshaw Scale: 3 <1-5, (1 best)>
Not an easy star to locate but Enif gives the area of sky. Set in the snorting breath of our frolicsome nag.
Comments: I expected separation to be easier for this one. X72 shows elongation but X174 just creates the line of dark in unsteady skies tonight. The primary appears a Deep Yellow with a hint of Orange. An oval of similar magnitude in the field add to the complication. There is a Y-shaped asterism in north of field.
Tim Leese
Star: Struve 2797
Date & Time: 24 October 2001 ( 21:15UT )
Seeing: 5-6 <1-10 Seeing Scale (10 best)>
Location of site: Northwich, Cheshire. UK.
53° 15' N -2º 33' W
Site classification: Suburban
Conditions: Clear sky in patches of drifting cloud.
Moon(1st Quarter)
Sky darkness: 3.0 ( UMi ) <Limiting magnitude>
Telescope: 200mm f/6 Newtonian reflector mounted over a Vixen GP mount (manual slow motion).
Eyepieces: 20mm plossl, 10mm Plossl, 9mm orthoscopic.
Magnification: X60,X120, X133.
Using a magnification of X60 didn't split this double but it was located in a very interesting fov to compensate. Using X120 and X134 split this star into a pair of white and purplish coloured stars.