David's Astronomy Pages Notes - Session 428 (2010-09-11) Notes (S413)   Notes (Main)   Home Page   Notes (S428)

Goto Images from 2010-09-11

Spectra Filter Focussing (Star Analyser 100)

Series of Best Focus measurements of HIP 92833 (G8III spectral type) were taken with 
Clear Filter (at 7.8 deg C) and Star Analyser 100 (at 8.0 degC)

[ Note : Min  Session Temp 7.6 degC, climbing to 9 deg C as cloud cover came over] 

C Filter - Best Focus 3307  
S Filter - Best Focus  2756 from zero order star 
S Filter - Best Focus  2645 from first order spectra visual sharpness

S-C Focus Offset = -551  from zero order star  (cf -557 previous offset )
S-C Focus Offset = -662  from first order spectra visual sharpness

Images and graphs shown below.

Double Star - HIP 92833 / HIP 92829

Annotated CCD Image (cropped) 3s exposure (single frame), 3x3 binning, C Filter  2010-09-20  (#snap) 12" LX200R  (at f/9.7) + ST-10XME

Slitless spectra of HIP 92833 taken with Star Analyser (3x3 binning)

Annotated CCD Image ( cropped) 1s exposure (single frame), 3x3 binning, S Filter  2010-09-20  (#snap) 12" LX200R  (at f/9.7) + ST-10XME

Slitless spectra of HIP 92833 taken with Star Analyser (1x1 binning, rotated)

Annotated CCD Image ( cropped) 1s exposure (single frame), 3x3 binning, S Filter  2010-09-20  (#snap) 12" LX200R  (at f/9.7) + ST-10XME

Example Screen Captures of example frame   shown in RSpec -Realtime Spectroscopy Software (http://rspec-astro.com/)

Focus Profile  based on Zero Order Star Image

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