Struve 2098

Morgan Spangle
Star: Struve 2098
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

14.3 145.2

      

David Jenkins
Star: Struve 2098
Date: 12 June 2006
Time:  5:00-7:30 UTC
Seeing: <1-10 Seeing Scale (10 best)>: 5
Transparency: <1-10 Scale (10 best)>: 8
Location of site:Orem, Utah USA
Latitude, 40.29694. Longitude, -111.69389
Site classification: Utah Valley urban area of 500,000 with strong light pollution due to acorn glass street lights which shoot light up and out – The bane of all local observers. Salt Lake City metro light dome to the northwest at 40 miles.
Conditions: Clear, breezy (as can be seen in some of the images), warm
Moon: Full moon raising late in observing session
Sky darkness: <Limiting magnitude>: 3.5
Telescope: Celestron GPS 11" on APT Wedge
Mount: Standard Celestron fork and tripod
Eyepieces: Meade Super Plossl – 32mm
Diagonal: Yes, Meade 1.25" flip mirror diagonal
Magnification: Approximately 350X using Nikon Coolpix 4500 and 4X zoom
Software: Reduc version 3.62 – Great software from Florent Losse. S33 group member.


Distance: 14.4, PA 146

 
     

Richard Jepeal
Star: Struve 2098
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

 Another good-looking triple. All are yellowish to different intensities.
  

Axel Tute
Star: Struve 2098
Date: 17.07.2006
Seeing: <1-10 Seeing Scale (10 best)>: 7
Transparency: <1-10 Scale (10 best)>: 9
Location of site: Küssaberg-Dangstetten, Germany
Site classification: rural
Conditions: no wind, warm 21.3°C 43% humidity
Moon: no moon
Sky darkness: Bortle 4
Telescope: Celestron 8
Eyepieces:
Magnification:

 I tried to make a good drawing from this one

 
           

Wolfgang Vollmann
Star: Struve 2098
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

STF2098 = WDS 16457+3000

This is a very unequal pretty quintuple system! A and B are quite close with my focal length of 1040mm, C and D are widely separated. D has a faint companion a to the west which is only 13.7mag according to the current WDS. This pair Da was not measurable since the star images are merged but the companion clearly shows up in my image! All other pairs were easily measurable on my images. Judging from the proper motion data in the WDS components A and B have common proper motion and seem to be related They have different proper motion from C and D but these two widely separated stars seem to be a common proper motion pair!

Measures: STF2098AB: year 2006.57 / distance 14.3 arcsec / PA 145.5 deg STF2098AC: year 2006.57 / distance 65.7 arcsec / PA 128.9 deg STF2098AD: year 2006.57 / distance 66.9 arcsec / PA 17.3 deg STF2098BC: year 2006.57 / distance 52.4 arcsec / PA 124.5 deg.

 
       

Ian Coster
Star: Struve 2098
Date: 29/08/06
Time: 22:00 UT
Seeing: 3/5
Transparency: 4/5
Location of site: London
Lat: 51:27:54N, Lon: 0:16:36W
Site classification: Suburban
Conditions: Clear
Moon: Not risen
Sky darkness: Mag4 Sky (ZLM)
Telescope: Orion Optics 200mm F6
Eyepieces: 18mm Ortho
Barlow: No
Magnification: x67
 
 		Comments: Moderately rich field Primary Colour: White Secondary Colour: Orange General Notes: Easy split in 18mm and a clear colour contrast Measurements: PA: 147 Sep: 14.3 (3x Barlow & 12.5mm MG. scale constant 5.3" per division)
 
     
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