Content Comparison

For a detailed Finder Chart and rotation setting see Kyle Kaplan's software. For rough rotations use the lookup table below.

393 363 = Default Encoder Setting at 90 deg. PA (slit east to west)  (NOTE: Default encoder setting was 393, but changed to 363 after installation of rotator)

Position Angle (Start north and go east, N=0, E=90, S=180, W=270 degrees, Default = 90 deg slit oriented east-west)

(Encoder Setting) = 393  363 - 90 + (Position Angle) = 303 273 + (Position Angle)

Encoder should not go further than WARNING: We recommend you do not rotate the instrument +/- 180 90 degrees from the nominal 90 degree position andle to avoid entangling wires and hoses.  The encoder setting limits are are:

For a 10,000K A0V star with H-K ~= 0, the IGRINS Exposure Time Calculator (Version 2.11) gives the following estimates.  Based on the analysis in (INSERT CHAN PARK'S SPIE PAPER LINK HERE) IGRINS ETC v2.11 overestimates S/N, so it actually is ~83% of what IGRINS-ETC reports.  This is reflected in the estimates below.

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