Struve 3012 - 3013

 
Richard Harshaw 
Star: Struve 3012 - 3013
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: 311x
Harshaw Scale: 3 <1-5; 1 best>
(Alias Cc = STF 3013)
HD Number 220922
ADS 16766 
Position:  2327+1637  Rating:  3
Components:
 A:  9.2m, G0
 B:  9.3m, 3” @ 192 + 
 C:  9m, G0, 53” @ 66 
 c:  9.8m, Cc: 3” @ 275
Year of last AB Measure:  1974
Observed colors:  Y, R, Y, ?

Observations: Observed at 311x.  A nice double double (but not of the same quality as Epsilon Lyrae).  The brighter pair (AB) looked W and oW.  The dimmer pair (Cc) looked to be W and bW.

Notes: First measure 2.6" @ 191.
 


 
Bob Hogeveen
Star: Struve 3012 - 3013
Date & Time: October 5, 2001, 23.59(~)
Seeing: 6 <1-10 Seeing Scale (10 best)>
Transparncy: -- <1-10 Seeing Scale (10 best)>
Location of site: Annen, The Netherlands , 53º N, 6º'E 
Site classification: Village-backyard 
Sky darkness: 3 <Limiting magnitude>
Telescope: Celestron C11 
Magnification: 97x, 187x
Harshaw Scale: 1 <1-5; 1 best>
A very nice little double-double. The combination of these two rather pretty, but not spectacular, doubles makes it a favorite for me. These stars put up a real nice show in the C11, already clearly split with 97x. Together with a fifth star in the field the doubles form a little equalsided triangle (upside down), where the doubles are the basis.

A bit ashamed of myself I found in my notes that I observed these stars before with the LX10 and noticed only one pair of doubles then...

What was it on this watery, moonlit night that made these and other little doubles stand out so well in the C11?

Magnification of 187x didn't improve things. Wide and easy separations, but mediocre star-images. 

It was not a good night for colors, most stars looked yellowish. I will revisit these doubles (soon?) on a good, dark night and check out the colors more carefully.
 

Ambience: It was a somewhat special night. Not only I had the CG11 out for the fist time since mid-august, bus also I had an unexpected good sub-arcsecond observation.

It's Autumn and, indeed, winter is coming. Around here that means a lot of rain and on the few clear days it quickly becomes misty from all the water around. During the day the typical autumn-calls of birds are all around and sitting out in the dark I heard the gaggling of geese flying by.

BTW, today was a lovely sunny day. I spent the whole day outside preparing a new observing spot. The main task in this was getting a plumtree out of the way and out of the ground. If this spot suits me during this winter I plan to build a simple roll-off roof observatory there. My main problem here are trees. Like regular trees should do, they keep on growing... At the moment it is evening. I just took a look at the sky, at that moment it started raining again.

Yesterday evening I came home from my badmintonclub around 23.00 and there were actually stars to be seen. It was cloudless!

I immediately started putting my gear out, not the LX10 which I still use regularly for short session "between the clouds", but the CG11, hoping for a longer and more serious observingsession.

Of course there was a lot of light from the Moon. The sky was watery and greyish and that showed in the scope. Most of the time I had to use the 30mm Ultima, which gives 67x, to keep the star-images reasonable. For some doubles I really needed more, but mag's like 140x and 187x didn't give nice images.

I started to check out some bino-doubles, quickly locating them by using the ASC's. This showed the quality of the sky: Most of them were not splittable with the 80mm f/6 finderscope.

Cheking out some more serious doubles I got reasonable images of several "around 2-arcsecond" ones. All of them were split (from clear to just) with 67x. 
This result pleased me, and around 01.00h I decided to check out 36 And. I was surprised to see that with my 10mm plossl (280x) this 0.8"-double was easily split, and the images were not to bad. So the sky had settled down (and the scope had cooled down)?

Even 560x gave a reasonable image, with a real wide split...

Immediately after that I slew the scope towards 37 Peg. Only to see the darkness of trees in my FOV...

It was too late for 37 Peg, the western part of Pegaso had disappeared behind the trees.
 

 
 
Jim Phillips
Star: Struve 3012 - 3013
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: ---
 
Excellent double double. One equal white pair, the other a very unequal pair, white and faint blue.