| Penny Fisher | ||||
| Star:
Struve 1999
Date & Time: July 1st, 9:30 ET Seeing: 8 <1-10 Seeing Scale (10 best)> Location of site: Englishtown NJ, 40.25 N 74.333 W Site classification: Suburban Sky darkness: -- <Limiting magnitude> Telescope: 8 inch Dob Magnification: 96x |
Struve 1999 is in the same FOV as Xi Scorpii. It's a beautiful
wide pair of almost similar magitude. Component 1 looked to be a pale yellow
and component 2 looked rather orange. But as I stared at the pair, the
optical illusions that sometimes happen when observing doubles did...and
towards the end of the observation I was thinking that comp. #2 was more
a bluish color.
Regardless of how long I observed, I couldn't decide but I think in the end, I went back to the orignal colors, pale yellow and a pale orange.
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| Luis Argüelles | ||||
| Star:
Struve 1999 (also Xi Scorpius)
Date & Time: July,15,1998 - 21:30 UT Seeing: 6.5 <1-10 Seeing Scale (10 best)> Location of site: Santander - Spain Site classification: Sky darkness: 4.5 - (2.5 near horizont) <Limiting magnitude> Telescope: Vixen 102 mm f/9.8 Achromatic refractor Magnification: 25x, 50x, 100x, 200x |
Using the setting circles, I navigate from Antares towards
this very nice pair of double stars. The first observation is made at 25x
and interestingly I observe them as something more than pinpoint stars.
Anyway, I don't seem confident at all to say that I observe an elongation
at 25x.
Nevertheless, at 50x, both Xi Scorpius and Struve 1999 are an easy split with my 4" refractor. Xi Scorpius is located North from Struve 1999 and is a brighter pair, but the pair from Struve 1999 is easier to split than Xi Sco. At this magnification I can not observe difference in coloration in Struve 1999 and both components show more or less the same magnitude. On the other hand, I easily observe a nice difference in magnitude from both components of Xi Sco. What is very interesting is to note that these two double stars offer almost the same beauty as the typical "doble-doble", Epsilon Lyra. Using 100x, I observe a clear difference in magnitude in Struve 1999: The western component is a bit brighter than the another one. Also, I can't observe difference in coloration between them, and both components are rendered as white with a very slight yellowish tint. Maybe the low altitude of the star over the horizon makes it a little yellow. Again at 100x, the main component of Chi Sco appears white-light yellow, while the secondary does have a very soft blueish coloration. After removing the star diagonal, the main star of Chi Sco appears as
orangeish. The secondary is white or white-blue (??). I also confirm the
white coloration of both components of Struve 1999.
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| Pino Bandini | ||||
| Star: Struve
1999
Location of site: Ravenna, Italy Date of observations (UT): 18 June 2000 – 21.55 UTC Site classification: Urban Sky conditions: Seeing: 5 (10 best) Temperature: 23C Limiting visual magnitude: -- Telescope: Celestron C8 Magnification: 81x (eyepiece 25 mm Plossl) + diagonal |
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| Mary Flanagan | ||||
| Star:
Struve 1999
Date & Time: 06 Jul 2000 04:46 UT; 05 Jul 11:46 PM CDT Seeing: 6 <1-10 Seeing Scale (10 best)> Transparency: 6 <1 - 10> Location of site: Apple Valley MN, USA 93d 14m 25s W; 44d 45m 17s N Site classification: Suburban Sky darkness: 4 <limiting magnitude> Telescope: 8" f/6 Dobsonian Magnification: 80x |
A wider pair than Xi A & C. Both looked grayish-tan
in hazy sky. Perceived a very slight difference in magnitude. Would like
to go back to this pair of doubles when seeing/transparency is better &
I can try a little more magnification.
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| William L. Schart | ||||
| Star: Struve
1999
Date & Time: 7/17/00 11:51 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: 3.35 <Limiting magnitude> Telescope: Orion 6" Dob. Magnification: 32x, 48x, 72x, 120x, 98x 144x, 240x |
Visible in same field as xi Sco. Split even at 32x. No
apparent color was seen. Separation 10”, PA 95 (published 11.8, 99)
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| Eddy O'Connor | ||||
| Star: Struve
1999
Date & Time: July 20th 2000, 7 p.m local; UT +10 Seeing: 8 <1-10 Seeing Scale (10 best)> Transparency: 8/10 Temperature: -- Location of Site: Terara, New South Wales, Australia, Long.150.38 degrees; South 34.52. Site Classification: Suburban Sky darkness: 5.5 <Limiting magnitude> Instrument: 8" F9 Dobsonian Magnification: 72x (25mm K) |
This is a northerly double and the finest field of the
night. Located in a dim area of sky it sits close to the brighter Xi and
is in the same telescopic field. 1999 as an almost equal visual pair is
wide and in stark contrast to Xi 1 and 2. I noticed the more easterly companion
had a pinkish hue.
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| Richard Harshaw | ||||
| Star: Struve
1999
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): July 22, 2000; 0230 hours Site classification: suburban Sky conditions: seeing-- 8 out of 10 transparency-- 8 out of 10 limiting visual magnitude-- 4.5 mag Telescope: Celestron C-8 Eyepiece: 12.5mm (MicroGuide), 166x. |
I made six pairs of separation and PA measures using the
Micro-Guide and got an average of 12.1" in PA 97.3.
Magnitudes: 7.4 , 8.0 Sep/PA's: 12" @ 100 Year of measurement: 1988 Distance (light years): 93 Luminosity (in suns): 1.17 |
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| John M. Ryan | ||||
| Star:
Struve 1999
Date of Observation: 3/08/00 21UT Location of Observation: Barraras, Salamanca, Spain 40º N, 6º W, Elev. 800 Meters. Seeing: 6 to 7 (1 - 10, 10 best) Transparency: 8 Limiting Mag. (naked eye): 4.5 Site classification: Rural Instrument: Televue 101 Apo Refractor Magnification: 90X (6mm Radian) |
Separation (Clear or Touching):Clear
Magnitude Comment: Both components about equal in accordance with the data. Color Comment: Both white. General Comment: Nice easy split. In the same FOV as Xi Sco. With the similar magnitudes and close angular distance this double reminded me of a small animal peering out of the dark. |
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