Rotation PA -> Encoder Table for IGRINS

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

133 = Default Encoder Setting at 90 deg. PA (slit east to west)

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) = 133 - 90 + (Position Angle) = 43 + (Position Angle)

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

Positon Angle	Encoder Setting
0,180	43
15,195	58
30,210	73
45,225	88
60,240	103
75,255	118
90,270 (default)	133 (default)
105,285	148
120,300	163
135,315	178
150,330	193
165,345	208
180,360	223