Struve 2978

 
Richard Harshaw 
Star: Struve 2978
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-8, C-11
Magnification: 112x, 311x
Harshaw Scale: 2 <1-5; 1 best>
HD Number 218395
ADS 16519
Position:  2308+3249  Rating:  2
Components:
 A:  6.1m, A3 V
 B:  7.5m, 8” @ 147 + 
Year of last AB Measure:  1969
Distance (l.y.): 491, Luminosity (Suns): 88
Observed colors:  W, B 

Observations: C11: Observed at 112x.  Y! and B, nice color combination. 
The galaxy NGC 7490 (13.1m but large) is located about 1 deg S and showed up, at 311x, as a very dim hazy disk without a sharp nucleus.  I rated it 5.
Webb saw them as W and bW.

Notes: This star rotates at 165 kps.
First measure 8.4" @ 146.
The stars share common proper motion.
 


 
Jim Jones
Star: Struve 2978
Date & Time: 09/07/01   0600 UTC
Seeing: 5 <1-10 Seeing Scale (10 best)>
Location of site: Lake Oswego, Oregon
Site classification: Suburban
Sky darkness: 4.0 LM
Sky:  Full moon + 5 days.
Telescope: 8" LX50
Eye Pieces:  18 mm Radian, 2x Ultima
Magnification: 112x, 224x
Est PA without inst.....155d
Primary...blue-white
Double is set in western corner of an isosceles triangle.  A fourth bright star to the south makes a kite shaped asterism.

A dim, wide double 3/4 of FOV to the NW is
STF 2975 AB (10.2, 10.4 mag, 35.0" sep, 131d PA)
 
 
 
 
 

 


 
Mary Flanagan
Star: Struve 2978
Date & Time: 26 Sep 2001 02:56  UTC;
Seeing: 5 <1-10 Seeing Scale (10 best)>
Transparency: 5
Location of site: Apple Valley MN, USA
93d 14m 25s W; 44d 45m 17s N
Site classification: Suburban 
Sky darkness: 3 <Limiting magnitude>
Telescope: 12.5" f/5 Dobsonian 
Magnification: 106x, 144x
This one was really iffy. At 106x, it was all over the place; I might have seen the secondary pop out briefly, but wouldn't bet the farm on it. 144x squished it like a bug. I can't really count it as a split, so will try to give it a revisit when the sky . . . and my collimation . . . are better.
 
 
 
 
 
 

 


 
Jim Phillips
Star: Struve 2978
Date & Time: Sept. 29, 2001
Seeing: 6-7 <1-10 Seeing Scale (10 best)>
Location of site: Hodges, South Carolina, USA
Site classification: Suburban.
Temperature: 54ºF
Sky darkness: --- <Limiting magnitude>
Telescope: AP 155 F/7 Apochromat
Magnification: ---
 

Star: Struve 2978
Date & Time: Oct. 15, 2001
Seeing: 6 <1-10 Seeing Scale (10 best)>
Location of site: Hodges, South Carolina, USA
Site classification: Suburban.
Temperature: 72ºF
Sky darkness: --- <Limiting magnitude>
Telescope: AP 9" F/15 Apochromat
Magnification: 214x
 

Yellow, Bluish. Another very nice pair.
 
 
 
 
 
 
 
 
 
 
 

White with perhaps a slightly yellowish hue, bluish. Very nice. 214X.


 
John M. Ryan
Star: Struve 2978
Date & Time: 2 Oct. 2001 ( 21:40 UT)
Seeing: 6+ <1-10 Seeing Scale (10 best)>
Location of site: Barreras, Salamanca, Spain.
Site classification: Rural,Suburban.
Conditions: fairly dry but with gusts of wind.
Sky darkness: 3+ almost full moon. lots of light <Limiting magnitude>
Telescope: Televue 101 refracter mounted on a Gibralter Alt-Az tripod.
Eyepieces: 19mm Panoptic, 6mm Radian
Magnification: 28X, 90X
Harschaw's Escale: 2 <1: Excellent, 5: Poor>
Found the double with the 19mm Panoptic and then split the double at 90X with the 6mm Radian. Both components seemed to have a tint of blue. This double showed up very nice, very sharp in the Televue 101 in spite of the full moon; so much so that I gave it a rating of 2.
 
 
 
 
 

 


 
Mary Flanagan
Star: Struve 2978
Date & Time: 12 Oct 2001 01:05 UT
Seeing: 8 <1-10 Seeing Scale (10 best)>
Transparency: 6 <1-10 Scale (10 best)>
Location of site: Apple Valley MN, USA
93d 14m 25s W; 44d 45m 17s N
Site classification: Suburban 
Sky darkness: 3 <Limiting magnitude>
Telescope: 12.5" f/5 Dobsonian 
Magnification: ---
Got it this time! Pale blue primary & creamy sec.

Ambience: Lights. Porch lights, garage lights, street lights, car lights. Don't remember who it is that's bothered by the barking neighborhood dogs, but I'll trade you my lights for your dogs!
 
 
 
 
 
 
 

 


 
Eddy O’connor
Star: Struve 2978
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: 2 <1-5, (1 best)>
This is a very low object for me and sits beneath the square and NE of Matar.

Comments: This is a Whitish star with a Bluish companion carrying all the distortion of the heavy atmosphere and cooling damp air.
 
 
 
 
 
 
 
 
 

 

 
 
Stuart Clough
Star: Struve 2978
Date & Time: 24.10.01 2010 UT
Seeing: 6 <1-10 Seeing Scale (10 best)>
Location of site: Near Halifax
West Yorkshire, England.
Site classification: Suburban
Temperature: 8ºC
Sky darkness: 3.8 (U Mi) <Limiting magnitude>
Conditions: Variable cloud, Wind SW 8 kts
Telescope: Orion Optics UK GX250
10"  f4.8 Newtonian on Vixen GP mount.
Eyepieces: 20mm Plossl, 9 mm Ortho
Magnification: x60, x133
             
Nice double, split easily at x60, but much better at x133. The field was washed out by a first quarter moon and a high haze. This also made colours difficult to discern. I found it 
helped in this regard form a first impression and then have a good hard look after a 
minute away from the eyepiece.

I made the primary pale yellow whilst the secondary showed a bluish cast.
 
Ambience: The evening was very autumnal, leaves coming down in the light breeze, heavy dew, the temperature dropping away in the clear spells and a bright, low  first quarter moon washing out the sky helped by what seemed to be a high haze. The overall effect was as though someone had thinly and  transparently coated the sky with an inferior grade of whitewash. A quick look at M36 rising in the East left no doubt that this was not a night for DSOs, but Gamma And confirmed that the seeing was not so bad and doubles would be pretty good. So they were, even though all the neighbourhood security lights seemed 
to be on in some sort of bizarre competition.