VI. Spatial Scale Tests


The SBIG specifications for the spectrograph include the pixel-scale. However, the quoted pixel-scale assumes a particular focal ratio and optical path that is quite different from those for the Andreas 0.5m telescope. One could attempt to calculate how this would affect the pixel-scale. But it is better to actually measure it. There are really several different questions to be addressed in this section:

I addressed these questions by making a series of observational tests on a set of double stars in June (without the focal reducing lens) and July (with the focal reducing lens) 2007. The basic properties of the targets are given in Table 5.

Table 5 - Observational Properties of Double Star Targets
Name RA (J2000) Dec. (J2000) Mv1 Mv2 Separation PA
hhmmss.s ddmmss arcsec degrees
BD-12 3676 124116.0 -130050 5.88 5.89 5.3 312
BD+84 290 124913.8 +832446 5.29 5.74 21.5 328
BD+17 2768 144043.5 +162505 4.88 5.79 5.5 111
BD+37 2665 153922.7 +363809 4.96 5.91 6.3 306
BD+53 1875 163613.7 +525527 5.38 5.50 89.8 196
BD+55 1945 173215.9 +551022 4.87 4.90 62.6 312
BD+27 3410 193043.2 +275734 3.37 4.68 35.0 55

    Guider Pixel-Scale and Field of View
    Imager Pixel-Scale and Slit Length
    Strategies for Binning

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Updated: 2009 August 21 [pbe]