| Morgan
Spangle |
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| Star: Struve 2090 A-C Date: 11 June 2006 Seeing: <1-10 Seeing Scale (10 best)>: 5 Transparency: <1-10 Scale (10 best)>: 7 Location of site: Larchmont, NY Site classification: Bright suburuban Conditions: Cool, breezy Moon: Full Sky darkness: 3.5 Telescope: 23.5cm SCT Mount: Takahashi NJP Temma 2 Eyepieces: SBIG ST2000XM CCD camera Magnification: n/a |
NAME SEP PA NOTES 69.0 24.7
ANOTHER NICE SET: AB:17.8/157.2; AD:
90.5/28.0
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| Richard Jepeal | ||||
| Star: Struve 2090 Date: July, 14th, 2006 Time:--- Seeing: 6-7/10 Transparency: --- Location of site: New Britain, Connecticut USA Site classification: Urban Conditions: ---- Sky darkness: --- Telescope: 8in Celestron Nexstar Eyepieces: --- Magnification: 53x to 228x |
Nice-looking
triple. Primary
is yellow-light orange, K7 spectrum. Secondary is a dark blue and the C
component is a dark yellow. This triple is surrounded by a very light
orange
glow. |
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| Wolfgang
Vollmann |
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| Star: Struve 2090 Date: 2006 July 26 Time: 21:00-24:00 UT Seeing: 5 <1-10 Seeing Scale (10 best)> Transparency: clear Location of site: Vienna, Austria Site classification: Suburban Conditions: Moon: Sky darkness: 4.5 <Limiting magnitude> Telescope: 130/1040mm refractor Camera: SBIG ST237A CCD Exposures: 6 or 12 x 10 seconds for astrometry. Distance/PA measurement was done with these images also except where noted (bright stars need shorter exposure times of 1 sec or less) Image measurement: astrometry with Astrometrica software and UCAC2 or USNO B1.0 catalog (see http://www.astrometrica.at); with exact focal length and image orientation I measured distance and PA with AIP4WIN software. I took means of measuring all my images for a star. There is a scatter of 0.2 arcsec in separation and 0.2 deg in PA. Scatter in PA is much larger if the stars are very close. Note: All images have north up Eyepieces: n/a Magnification: n/a |
STF2090 = WDS 16449+0957 The WDS has 4 companions
A to D. I was only able to
image A (bright one in the center) and the companions C and D to the
north
(up). CD forms a nice double! Faint star B was not visible on my
images. Proper
motion data in the WDS suggests that the stars are not related. Measures: STF2090AC: year 2006.57 /
distance 69.0
arcsec / PA 24.8 deg STF2090AD: year 2006.57 / distance 90.5 arcsec /
PA 28.0
deg STF2090CD: year 2006.57 / distance 21.9 arcsec / PA 38.1 deg
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