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Home > Astronomy > ACAM > ACAM slit positions

When an observer requests deployment in the focal plane of one of ACAM's slits, the slit is positioned on the optical axis of ACAM, but there are small slit-dependent differences in the exact position, reflected as shifts in y position on the CCD, and tabulated below:

Slit width (arcsec) 0.5 0.75 1.0 1.5 2.0
Shift (arcsec) 0.62 0.34 0.00 -0.17 -0.24

The measurements were made on images of the back of each slit taken through the Sloan g2 filter (#219), and the shifts are relative to the measured position on the CCD of the 1.0-arcsec slit.

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Contact:  (ACAM Deputy Instrument Specialist)
Last modified: 30 April 2012