| Paolo Morini | ||||
| Star:
Struve 589
Date & Time: 17 nov 1998, approx 22 UTC Seeing: 4 <1-10 Seeing Scale (10 best)> Location of site: San Romualdo, a little village in the country near Ravenna – Italy. Site classification: Suburban Sky darkness: 4.5 <Limiting magnitude> Telescope: Takahashi FS102 Magnification: 164x (LE5 Tak eyepiece) |
The first observing
session about this program (17 nov 1998) took place at San Romualdo, a
little village in the country near Ravenna – Italy.
With some friends we were engaged in the observation of Leonid Meteors (only one meteor in the evening, and when I was working bout my telescope and looking in the opposite direction). My scope was set up on a Vixen GPDX equatorial mount, fitted with digital circles (Vixen Stellar Guide). The scope was paired with my Televue Pronto. I thought that it would be
more sporting to switch off the digital circles and finding the stars through
star-hopping. I have prepared a detailed map for each star
Finding the first star, FGW
Struve 589, was very tricky but, combining my accessories I found a good
solution I think to use for future observations: I fit the
Now I am working to fit a
home-made reticle (with thin copper wire glued on a thin nut) to the field-stop
of a 40 mm eyepiece to use for star-hopping. The
About Struve 589, that was
very tricky to find through star-hopping but then I find the right way
to look for a faint star in the sky - clearly split but faint.
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| Craig M. Carver | ||||
| Star:
Struve 589
Date & Time: 11/24/98 0620 UT Seeing: 6-7 <1-10 Seeing Scale (10 best)> Location of site: Madison, WI (Lat 43.07, Long 89.38, Elev. 500 ft) Site classification: Suburban Sky darkness: 4.8-5.0 <Limiting magnitude> Telescope: 6" Maksutov Magnification: 95x, 190x |
This is a close pair of
nearly equal mag pale orange stars, just beginning to split at 95x, but
seen more clearly at 190x. There is another nice wide double 1/3
degree due west, with mag 7.5-8.0 white/blue star and 9.5-10.0 blue companion. Uranometria marks this as a double star. The sky is much steadier
and darker than the previous night of observation.
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| Chuck Layton | ||||
| Star:
Struve 589
Date & Time: Dec. 23, 1998, 08:15 UT Seeing: 2 <1-10 Seeing Scale (10 best)> Location of site: Tacoma (WA) Site classification: --- Sky darkness: 3.6 <Limiting magnitude> Telescope: 20cm f/6 Eq. Newtonian Magnification: 177x |
Observed Colorations
of Components: Primary - blue white, comes - white
Other comments: Very close and faint. Even though both components are listed at the same magnitude, the comes appears a slight bit fainter.
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| Dave Mitsky | ||||
| Star:
Struve 589
Date & Time: 1/19/99 02:22 UT Seeing: 6 <1-10 Seeing Scale (10 best)> Transparency: ~ 4 Location of site: ASH Naylor Observatory (http://www.msd.org/obs.htm) near Lewisberry, PA Site classification: Rural Sky darkness: ~ 5.0 <Limiting magnitude> Telescope: 17” f/15 classical Cassegrain Magnification: 118x, 202x |
A fairly close binary (4.3")
just east of the Orion-Taurus border (page 179, Uranometria 2000.0) and
about 2 minutes east of an attractive, more widely
separated binary in Taurus. The components are eight magnitude G5 stars that appeared colorless, i.e. white. |
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| Ilario Melandri | ||||
| Star:
Struve
589
Date & Time: 13/Dec/1999 – 18.58 UTC Seeing: 3 <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: 5.5 <Limiting magnitude> Temperature: +2.5C Telescope: 150 mm f/15 achromatic refractor Magnification: 140 x (eyepiece Plossl Clavé 16 mm) |
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| Randall Heckman | ||||
| Star:
Struve 589
Date & Time: 12/26/99 at 2:10 UT Seeing: 3 Location of Site: Heckman Observatory 40 37' 10" N and 99 03' 50" W Site Classification: Rural Limiting Magnitude: 5 Telescope: 8" Orion Dob Magnification: 120 |
Separation: Clearly
resolved
Magnitude Comment: Components of equal magnitude. Color Comment: White or colorless General Comment: Double easy to find and split.
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| William L. Schart | ||||
| Star:
Struve 589
Date & Time: 12/26/99 10:05 pm CST Seeing: 7 <1-10 Seeing Scale (10 best)> Location of site: Killeen, TX (Lat 31 N, Elev 600 ft) Site classification: Suburban Sky darkness: 4.5 <Limiting magnitude> Telescope: Orion 6" Dob. Magnification: 32x, 48x, 72x, 98x, 144x Star: Struve 589 Date & Time: 1/4/2000 9:58 pm CST Seeing: 7 <1-10 Seeing Scale (10 best)> Location of site: Killeen, TX (Lat 31 N, Elev 600 ft) Site classification: Suburban Sky darkness: 4.5 <Limiting magnitude> Telescope: Orion 6" Dob. Magnification: 32x, 48x, 72x, 98x |
Easily split
at 32x. Appears in the same field of view as Pi4 Ori. At 72x one appears
reddish, the other blue. Separation 35", PA 175 degrees.
Questions were raised about my observation of this pair on 12/26/99. I went back and this time I feel that I have observed the correct pair. Suspected splitting this at $*x, but definately split at 72x. PA 89d, the separation was just equal to one line width on my Celestron micrometer eyepiece. However, nothing in the literature supplied with this gives any information on correlating this to a measurement. Any help out there? |
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| Richard Harshaw | ||||
| Star:
Struve 589 [ADS 3417; SAO 112034]
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): Dec 29, 1999 (0200 to 0400 UT) Site classification: suburban Sky conditions: seeing-- began at 8 out of 10, degraded to 6 by 0400 UT transparency-- 8 out of 10 limiting visual magnitude—4.5 Temperature: began at 40F, dropped to 26F by 0400; no wind at first, but a breeze picked up slightly as a front passed by about 0330 UT Telescope: Celestron C-8 Eyepiece: Celestron Micro-Guide (160x), 2.48x Barlow (400x effective magnification) |
Measured with
the Micro-Guide with the Barlow. I took five pairs of measurements for
the separation and position angle and got an average of 4.9" at PA 282.
These compare favorably with the 1981 measurements on record of 4" and
288 (and decreasing).
I found that a pair of 4"
separation is just about at the practical limit of the MicroGuide for my
setup. I would need to get a stronger Barlow to go closer than 4", since
the problem is measuring the PA
I noted colors of White for the G5 primary and White for the G5 secondary. This pair has been measured by the Hipparcos satellite to be 139 light years away, which makes it about 1.3 times as bright as the Sun (0.9 and 0.4 for the primary and companion).
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| David Bushard | ||||
| Star:
Struve 589
Location of site: River Falls, WI (USA) longitude 92, latitude 45N elevation approx 800 ft (246 m) Date of observations: 29 Dec 1999, 8:00 to 11:00 pm local time (CST) Site classification: rural Sky conditions: Seeing: 6 of 10, improving later transparency: 6 of 10 limiting visual magnitude: 5.2 Temperature: 25 F (-3 C), winds light and variable Telescope: Meade 12" LX-200 EC Eyepiece: Televue 22mm Panoptic (138x) |
An easy split
at this low mag, but close. no color apparent.
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| Thad Robosson | ||||
| Star:
Struve 589
Date & Time: 12-30-99, 3:00 to 6:30 UT (12-31-99 UT) Seeing: 4-5 <1-10 Seeing Scale (10 best)> Location of Site: Carbondale, IL, USA Site Classification: Suburban/near rural Sky darkness: 4.7 using "stars counted in the area of" method, (Taurus) <Limiting magnitude> Telescope: 8" f/6 Newt on Dob mount (soon to be split ring :-) Magnification: 32x, 60x
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Notched at
32x, split clean at 60x, Orange w/silvergrey comp.
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| Allen Ginzburg | ||||
| Star:
Struve 589
Date & Time: 01/03/2000 Seeing: 8 <1-10 Seeing Scale (10 best)> Location of Site: Aptos, CA (USA) Site Classification: Suburban Sky darkness: 4 <Limiting magnitude> Telescope: Meade LX-200 f/10 Magnification: 104x
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Clearly separated,
uniform color of blue/white.
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| Jay Zimmerman | ||||
| Star:
Struve 589
Date & Time: 0430, 01/14/00 UT Seeing: 7 - 8 <1-10 Seeing Scale (10 best)> Location of Site: Carbondale, IL, USA Site Classification: Suburban/near rural Sky darkness: ~4.2 <Limiting magnitude> Telescope: 97mm, f7 apo Magnification: 80x |
Cleanly split
at 80x; much prettier at 107x. Colors: both A and B appeared to be just
a bit reddish. Estimated PA = 275 degrees (actual = 288 degrees).
A tiny, east-west, "headlight"
double (looks like dim lights of an old car in the distance - way down
in the valley - on a dirt road.
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| Philippe de Jocas | ||||
| Star:
Struve
589
Date & Time: January 22, 1h00-7h300 UT Seeing: 3-4 <1-10 Seeing Scale (10 best)>. Location of site: Ottawa/Hull, Canada Site classification: Suburban Sky darkness: 4.5 <Limiting magnitude> Temperature: -25C Telescope: 6" f5 newtonian Magnification: 95x |
589 was fully resolved at 95x, and noted as both white. On the way to it I had a quick look at Otto Struve 55 about 40' SW of p4 Ori. It is a double of the same general brilliance as Struve 589 but much wider at close to 40" NNE. And the 20' preceding, in Taurus, another one of the same family about 30" SWS. All three make a small row of close to 90' long. | |||
| Jim Brownfield | ||||
| Star:
Struve
589
Date & Time: 26/01/2000, 6:30 p.m.- 11:30 p.m. EST Seeing: 3 – 5 (improving) <1-10 Seeing Scale (10 best)>. Location of site: Huntsburg, Ohio, USA Site classification: Suburban Sky darkness: 6 mag., could see ST 855, going to 5th mag. star Rho <Limiting magnitude> Other observing conditions: 83% humidity, 16 degrees F. with 12" snow on ground going to 84% humidity, 4 degrees F. Telescope: 13.1"/F4.5 Dobsonian, with 5" aperture mask for the brighter pairs Magnification: 47x, 75x Star: Struve 589
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split at 47x, 75x for clean
separation
Just touching at 82x, clearly split at 128x |
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| John M. Ryan | ||||
| Star:
Struve
589
Date of Observation: 30/01/00 21UT Location of Observation: Ciudad Rodrigo, Salamanca, Spain 40º 36' N, 6º 32'W, Elev. 800 Meters Seeing: 7 to 8. Best so far this new year based on the Luis Arguelles method (0 - 10, 10 best) Site classification: Urban Limiting Mag. (naked eye): 5 Instrument: Meade 8"SCT Magnification: 80x,167x |
Separation (Clear or Touching):Clear
Split
Magnitude Comment: Both components about equal and seem to agree with the data of Mag 8 Color Comment: Both components seem to be white General Comment: A good double to start out the night, both components of equal magnitude and a separation of 4+ arc. sec. to check out the seeing and the scope. From the easy clear split the scope and the seeing conditions were responding favorably. |
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| Tom Teague | ||||
| Star:
Struve
589
Date & Time: 2000 February 13 Seeing: 7/10 (8/10 at zenith) <1-10 Seeing Scale (10 best)>. Location of site: Chester, England (53 11 08N; 02 51 39W) Site classification: Suburban Sky darkness: 4 (Moon just past first quarter) <Limiting magnitude> Telescope: 63/840 mm Zeiss Telementor refractor Magnification: x112, x210 Star: Struve 589
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Surprisingly difficult,
and no wonder - these stars are actually mag 9, not 8, and tonight the
Moon is only a few degrees away. Elongated, but ill-defined x112.
At x210, momentary glimpses of separation with averted vision, but still
poorly defined. I don't think I can honestly count this as a proper
split. Worth revisiting on a dark night. Dew problems towards
the end of this observation.
I revisited this pair following
my rather unsuccessful observation on 2000 February 13 (above). Elongated
x112. Definitely resolved (cleanly split) x210 using averted vision,
but only for periods of a few seconds at a time. A difficult pair
for this telescope, and near its limit. Both stars appear white to
me. Difficult to judge which is the brighter, although I suspect
it is the following star.
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| Tollefsen Magne | ||||
| Star:
Struve
589
Date & Time: February 25, 2000 at 21.15 UT Seeing: 6 <1-10 Seeing Scale (10 best)> Location of site: Skien, South-East of Norway Site classification: Suburban Sky darkness: 4.6 <Limiting magnitude> Telescope: Vixen 120mm 4 elements refractor Magnification: 353X (Celestron Microguide eyepiece, and a TeleVue 5X powermate) |
Separation
4,7 arcsec. Position Angle 275 degrees.
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| John Clemmer | ||||
| Star:
Struve 589
Date & Time: Feb 27/2000 2000 EST Seeing: 8, quite good <1-10 Seeing Scale (10 best)> Location of site: Priceville, Ontario, Canada W80 41'41" N44 10' 40" Site classification: Rural Sky darkness: 7/10ths lowest vis. magnitude around 6.1 seen in Orion <Limiting magnitude> Telescope: 4.5" f26 Kutter Schiefspiegler Magnification: 70x, 108x (40mm, 26mm eyepieces) |
clean w/ 40mm, 26mm, 70x,
108x
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| G.E.O.D.A Group | ||||
| Star:
Struve 589
Date & Time: 3-III-2000, 19:00-22:00 Seeing: 7.5 <1-10 Seeing Scale (10 best)> Location of Site: Manises, Valencia, Spain. GPS coordinates: 39º 29' 36" N, 00º 27' 56" W. Site Classification: Urban-Suburban Sky darkness: 4.5 <Limiting magnitude> Telescope: Meade 10" LX-200 SCT Magnification: 200x |
Published measures
are the mean of two observations made from two different observers.
d = 8.8; PA= 273
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