Old 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.

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) = 363 - 90 + (Position Angle) = 273 + (Position Angle)

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

Positon AngleEncoder Setting
285198
300213
315228
330243
345258
360, 0273
15288
30303
45318
60333
75348
90 (default)363 (default)
105378
120393

135

408
150423
165438
180453
195468
210483
225498
240513
255528

270

543