| Richard Harshaw | ||||
| Star:
HN 40
Date & Time: Late 1980's Seeing: 7 <1-10 Seeing Scale (10 best)>. Transparency: 7/10 Location of site: Columbia, USA 39º 30m N, ~ 90º W Site classification: Suburban Sky darkness: <Limiting magnitude> Telescope: Celestron C8 SCT Eyepieces: -- Magnification: -- |
Historical observation. Not from the official
period for this project.
A nice triple (the C star is cataloged
as H N 6), located at 1802-2302. The primary (O7 giant) is 7.2m and
was seen at 207x as white. The B star is 10.7m and is 5" away in
PA 22. It was too faint to get a color. The C star is 8.7m
and is 11" away in PA 210 and was seen as white. (There is also a
faint companion to C, listed as "c"; it is 10.7m and is only 2" from C
and PA 281. I saw it but could not get a color estimate on it.)
The A-B pair shares common proper motion. Distance is unknown.
I rated it 2 on my scale.
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| Eddy O'connor | ||||
| Star:
HN 40
Date & Time: July 18th 2001, 7.30 -9p.m local; UT +9 Seeing: 7 <1-10 Seeing Scale (10 best)>. Transparency: 7/10 Location of site: Terara, New South Wales, Australia Long.150º.38 ; Dec. S 34º.52. Temperature. 7ºC Site classification: Suburban Sky darkness: <Limiting magnitude> Telescope: 8" Newt. F9 Eyepieces: 25mm K, 12.5 mm ortho Magnification: 73x, 146x Harshaw Scale: 1 <1-5; 1 best> |
Mag. 7/8/10.5, Sep10.6"/5.4". This is
the easiest and most rewarding triple star in Sagittarius. It holds the
Dress Circle position in the famous Trifed Nebula(M20) and dominated this
field. The Primary star is a Pearly White and it is flanked by a Light
Blue star SW and deeper and fainter third companion NE all in a row
in a darkened sliver of sky. The mottled curtain-like nebulosity of the
Trifed enfolds the area making this a magnificent view at low power. Hartung
has observed a fourth star in the group with a 20cm mirror and a fifth
star with 30 cm. HS1
Ambience: This was another wonderful night of observing with light wind which only increased as I finished. A late departing skein of swans passed overhead, their plaintive cry in strange contrast to the totally quiet landscape under the glowing Milky Way. I noticed a slight change in Uranus's position and Neptune surprised me by presenting a delightful and contrasting wide double of 4" separation with Upsilon Capricorn which it is passing during the coming days. |
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| Luis Argüelles | ||||
| Star:
HN 40
Date & Time: 24th, July, 2001. 21:45 UT Seeing: 5.5 <1-10 Seeing Scale (10 best)> Transparency: 5-6 <0:worst -10:best > Location of site: Quintueles, Gijón, Spain. 43º 32N, 5º 55W. Altitude: 20 m. Site classification: Suburban Sky darkness: 3.5 <Limiting magnitude> Temperature: about 19º C Conditions: A lot of haze and moisture. Seeing is not bad at all, but haze actuates like a light diffusor and that makes difficult observe stars fainter that 10 magnitude. Humidity: about 90% Telescope: Vixen 102 4" achromatic refractor Eyepieces: Eudiascopic 35mm, Zeiss Ortho 10mm Magnification: 28x, 100x Harschaw Scale: 3 <From 1 to 5. 1 = Great, 5 = poor interest> |
With the observing conditions this is
not a remarkable double. At only 28x, but with difficulty, the "first"
split is appreciable. Going up to 100x it's clearly identified as a triple
system, converting M20 in a Nebula with surprise!
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