| Richard Harshaw | ||||
| Star: Alvan Clarck 1(HD 1641; SAO 53827;
ADS 285)
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): 03:30, Oct 17, 2000 Site classification: suburban Sky conditions: seeing-- 8 out of 10 transparency-- 7 out of 10 limiting visual magnitude-- 4.5 mag Telescope: Celestron C-8 Eyepiece: 10mm (207x) |
Sep/PA's: 1.8 + / 288 +
Year of last measurement: 1997 Distance (light years): 233 Luminosity (in suns): 7 Eyepiece and magnification: 10mm (207x) Colors noted: W and pB. It lies just 5' north of a deep orange star (SAO 53825, a K5 giant).
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| Tom Teague | ||||
| Star:
Alvan Clarck 1
Date & Time: 2000 October 19 (2045 UT) Seeing: 7 <1-10 Seeing Scale (10 best)>. Location of site: Chester, England (53 11 08N; 02 51 39W) Site classification: Suburban Sky darkness: 4.5 <Limiting magnitude> Telescope: 63mm Zeiss Telementor refractor Magnification: x47, x140, x210 |
Seen to be double at higher powers. Best x210. There is
quite a marked difference in magnitude. I can only see the comes
with averted vision, the star constantly flitting in and out of view.
It appears as a fainter, smaller disc, in contact with the primary, and
perhaps very slightly overlapping it. Not just elongated - two discs
clearly distinguished. To the south, in the same field, lies a brighter
star with which AC 1 makes a striking, wide pair when viewed at low power
(x47). At this magnification, the brighter 'primary' (actually a
small amplitude variable discovered by Hipparcos) is deep yellow.
I can see no colour in either component of AC 1. PA (Alvan Clark
1) estimated at 285 degrees.
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| Thad Robosson | ||||
| Star:
Alvan Clarck 1
Date & Time: 21, October, 2000 Seeing: 7-8 <1-10 Seeing Scale (10 best)>. Location of site: Phoenix, USA Site classification: Decidedly Urban Sky darkness: 4 <Limiting magnitude> Temperature: about 70ºF Telescope: 90mm ETX MakCas Magnification: 250x |
Found with 39x, not suspected. 125x gave up some elongation.
est. PA of 280°. 250x didn't do much except elongate enough
to say it was double. No dark between the nearly equal components.
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| Ilario Melandri | ||||
| Star:
Alvan Clarck 1
Date & Time: 1 nov 2000 , 21.05 UT Seeing: 6 <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 <Limiting magnitude> Temperature: +8C Telescope: 150 mm f/15 achromatic refractor (lens by Romano Zen, Venice). Magnification: 140x (Plossl 16mm) |
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| Rafael Benavides | ||||
| Star:
Alvan Clarck 1
Date & Time: 23, November, 2000 (22 h 00 m UT) Seeing: 6 <1-10 Seeing Scale (10 best)> Location of site: Posadas (Córdoba), Spain 37º 48' N - 5º 08' 30" W 100 mts over sea level Site classification: Suburban Sky darkness: 5.6 <Limiting magnitude> Temperature: 10ºC Telescope: Helios 120 mm f/8.3 achromatic refractor Eye Piece(s): Plossl 20 mm, Plossl 10 mm, Microguide 12.5 mm, 2x Barlow, 3x Barlow, diagonal prism |
It is a nice field. SAO 53825, orange star (K5) of magnitude
5.8, is located 4' SW. The pair did not split at lower magnification. Using
Plossl 7.5 mm (at 133x) I was able to separate it into a very close pair.
Best view at 330x. Really, it is a pretty pair. Both appeared to be pale
cream colour. I tried to measure it with Barlox 3x + diagonal prism + MicroGuide
12.5 mm at about 500x ! It is a crazy act for this aperture (120 mm), but
it is possible for bright stars. From an average of 4 measurements the
PA between the two was estimated to be 288º2 and separation 1"92 arcsecs.
November was a rainy month, it was mostly cloudy. I could observe only just a few nights. It´s incredible, but the night of the Leonids was clear and cold.
Now I know I was very lucky. On 18th I counted more than one hundred of
bright meteors and tens of trails. It was a pity that the Moon on Leo made
difficult to see fainter meteors, without moonlight we had seen an higher
activity. It doesn´t be compared with the storm of the last year
(about 5000 met/h) but I think I saw a great spectacle. How many meteors
will we be able to see the next year?
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| Susan Delaney | ||||
| Star:
Alvan Clarck 1
Date & Time: 2000-12-27/28 19:00 - 22:00 EST (00:00 - 03:00 UT) Seeing: 6 <1-10 Seeing Scale (10 best)>. Transparency: 8/10 Temperature: 26F Location of site: Fairfield, CT, USA Site classification: Suburban Sky darkness: ~ 4.7 <Limiting magnitude> Telescope: Discovery 10" DHQ f/5.6 Dobsonian Eyepieces and Magnification: 9mm Nagler (158x)
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At 158x, the stars were tightly paired. Both stars looked white to
my eye.
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