| Bob Hogeveen | ||||
| Star:
Otto Struve 72
Date & Time: November 14, 2001 Seeing: 5 <1-10 Seeing Scale (10 best)> Transparancy: 8 <1-10 Seeing Scale (10 best)> Location of site: Annen, The Netherlands 53N, 6E Site classification: Village backyard Sky darkness: 5 <Limiting magnitude> Telescope: Celestron C11 Magnification: 93x, 140x Harshaw Scale: 2 <1-5; 1 best> |
A pretty one, this one.
The primary is deep/golden-orange.
The secondary is much more faint but can be seen easily with the C11. The pair was in exactly vertical
position at the time of observation. This gave it a funny look. The faint
B was hovering a bit above the bright A. Somewhat like a setting sun with
a small detached part or reflection above it.
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| Rafael Barberá | ||||
| Star:
Otto Struve 72
Date & Time: 23/11/2001, 22:30 and 23:30 UT Seeing: 6-7 <1-10 Seeing Scale (10 best)> Transparancy: --- <1-10 Seeing Scale (10 best)> Location of site: Manises (Valencia - Spain) Site classification: Urban - Suburban Sky darkness: 4.0 <Limiting magnitude> Moon : One quarter Telescope: TeleVue 85 Eyepieces: Televue Ploss 20mm, Eudascopic 15mm, Eudascopic 10mm, Eudascopic 5mm, Celestron Ultima Barlow (2x) Magnification: 30x, 40x, 60x, 120x |
More dificult that Struve
495. A very hard one!. I can detect barely the companion at 120x only.
It has a DI of 86.5. My previous high mark was (and still is) Epsilon Bootes
with a DI of 90.07, but I think that Epsilon Bootes is easier that this
one, because I have more light to use that in this situation. Remember
that I'm using an 85mm refractor. With an sky of 6 or 7over 10 and a lot
of background light, this double is very hard to observefor me.
At lower power (40x) the
main star makes a beautifull ultra wide and colorful pair with the field
star SAO 93781, that lies at 12.5'. SAO 93781have spectra A0 and Struve
495 is K0. On a wide field eyepiece Struve 495 looks like the Sun reflected
over gold, and SAO 93781 blue. A very beautifull not_double experience.
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| Eddy O'connor | ||||
| Star:
Otto Struve 72
Date & Time: Monday, December 10th, 2001 10 p.m local; UT +10 Seeing: 6 <1-10 Seeing Scale (10 best)> Transparancy: 9 <1-10 Seeing Scale (10 best)> Location of site: Terara, New South Wales, Australia, Long.150º.38 ; Dec. S 34º.52. Site classification: Suburban Conditions: No Moon Temp. 17ºC. Sky darkness: --- <Limiting magnitude> Telescope: 8" Newt. F9 Eyepieces: 25mm K, 12.5 mm Ortho Magnification: 144x Harshaw Scale: 2 <1-5; 1 best> |
This beautiful object is
found in a hammock-like asterism of mag. 5.5 stars northwest of the Hyades.
Mag. 5.9/9.7; Sep.4.6"
Comments: The Primary is
a rich deep yellow star with the spark-like
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| William Schart | ||||
| Star:
Otto Struve 72
Date & Time: 9:00 -> 9:40 pm CST. Seeing: 6 <1-10 Seeing Scale (10 best)> Location of site: Killeen, Texas Site classification: Suburban Sky darkness: 4 <Limiting magnitude> Moon: No moon in the sky Telescope: 8" Celestar SCT Eyepieces: 25mm, 17mm, CMG (12.5mm) Magnification: 80x, 120x, 165x |
Although slightly wider
than the last pair, this proved to be a tougher split. Not much at all
at low power, elongation at mid power, I used the Microguide as a simple
EP to get a clean split. I attribute the difficulty to the magnitude difference
(almost 4).
The primary tends drowns
out the seconday, but I could pop it in view with averted vision. The primary
is a bright golden yellow; the seocndary too faint to tell.
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| Stuart Clough | ||||
| Star:
Otto Struve 72
Date & Time: 29.12.01 2040 - 2345 UT Seeing: 6 <1-10 Seeing Scale (10 best)> Location of site: Near Halifax West Yorkshire, England. Site classification: Suburban Temp: -4ºC Conditions: Clear except between 2110 & 2240, when mainly overcast, Wind SW - NW 5/15kts Sky darkness: 3.0 (U Mi) <Limiting magnitude> Telescope: Orion Optics UK GX250 Eyepieces: 25 mm Ortho, 20 mm Plossl, 9mm Ortho, 7.5mm Plossl Magnification: x10 (finder) x48, x60, x133, x160 |
This double was quite tough.
I suspect that it is never easy because of the difference of 3.8 magnitudes
between the two components. On the day, the full moon was also something
of a factor. At x60 there was no indication of duplicity at all. At x133
I thought I saw a faint point of light close to the bright glow of the
bright golden yellow primary, but could not be sure. The small increase
in power to x160 confirmed the pale ember that is the secondary in the
suspected position. Having done that it was possible to see the comes clearly
on return to x133. No colour could be discerned in the faint companion.
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