# JWST NIRCam dither patterns # # Mar 2020 - updated to include WFSS subpixel 2-point dither option added in APT 2020.2 # # Nov 2019 - file updated to include WFSS subpixel dithers, Coronagraphy Small Grid Dithers (SGD), and Subarray Primary dithers # (These have been in APT since 25.0.3, 25.0.3, and 25.4.0.1, respectively.) # # Nov 2017 - added new Imaging dither patterns introduced in APT 25.4.0.1 # # Offsets are relative to the selected aperture's reference position in that aperture’s Ideal coordinate system (X, Y). # For NIRCam, all aperture Ideal coordinate systems are nearly aligned (to ~1 deg of rotation) with the JWST coordinate system (V2, V3). # They are also roughly parallel to rows and columns in the NIRCam detectors. # Index X-offset(arcsec) Y-offset(arcsec) ## Primary Dither Patterns FULL 3TIGHT 1 -58.0 -7.50 2 0.0 0.0 3 +58.0 +7.50 FULL 3 1 -58.0 -23.50 2 0.0 0.0 3 +58.0 +23.50 FULL 6 1 -72.0 -30.0 2 -43.0 -18.0 3 -14.0 -6.0 4 +15.0 +6.0 5 +44.0 +18.0 6 +73.0 +30.0 FULL 9 1 -78.0 -33.0 2 -58.0 -24.0 3 -38.0 -15.0 4 -20.0 -8.0 5 0.0 0.0 6 +20.0 +8.0 7 +38.0 +15.0 8 +58.0 +24.0 9 +78.0 +33.0 FULL 15 1 -77.0 -32.0 2 -72.0 -33.0 3 -57.0 -23.0 4 -43.0 -20.0 5 -37.0 -14.0 6 -19.0 -7.0 7 -14.0 -9.0 8 1.0 0.0 9 15.0 3.0 10 21.0 9.0 11 39.0 16.0 12 44.0 15.0 13 59.0 25.0 14 73.0 27.0 15 79.0 32.0 FULL 21 1 -77.0 -36.0 2 -75.0 -30.0 3 -70.0 -21.0 4 -55.0 -23.0 5 -48.0 -18.0 6 -41.0 -12.0 7 -35.0 -12.0 8 -19.0 -5.0 9 -17.0 -7.0 10 -12.0 2.0 11 3.0 0.0 12 10.0 5.0 13 17.0 11.0 14 23.0 12.0 15 39.0 18.0 16 41.0 17.0 17 46.0 27.0 18 61.0 27.0 19 68.0 34.0 20 75.0 29.0 21 81.0 34.0 FULL 27 1 -84.0 -41.0 2 -77.0 -37.0 3 -71.0 -20.0 4 -64.0 -32.0 5 -57.0 -28.0 6 -51.0 -11.0 7 -44.0 -23.0 8 -37.0 -19.0 9 -31.0 -2.0 10 -26.0 -16.0 11 -19.0 -12.0 12 -13.0 5.0 13 -6.0 -9.0 14 1.0 -5.0 15 7.0 12.0 16 14.0 0.0 17 21.0 4.0 18 27.0 21.0 19 32.0 7.0 20 39.0 11.0 21 45.0 28.0 22 52.0 16.0 23 59.0 20.0 24 65.0 37.0 25 72.0 23.0 26 79.0 27.0 27 85.0 44.0 FULL 36 1 -83.0 -54.0 2 -78.0 -27.0 3 -77.0 -37.0 4 -72.0 -10.0 5 -63.0 -45.0 6 -59.0 -18.0 7 -57.0 -28.0 8 -52.0 -1.0 9 -43.0 -36.0 10 -38.0 -9.0 11 -38.0 -19.0 12 -32.0 8.0 13 -25.0 -29.0 14 -20.0 -2.0 15 -19.0 -12.0 16 -14.0 15.0 17 -5.0 -22.0 18 0.0 5.0 19 1.0 -5.0 20 6.0 22.0 21 15.0 -13.0 22 20.0 14.0 23 21.0 4.0 24 26.0 31.0 25 33.0 -6.0 26 38.0 21.0 27 39.0 11.0 28 44.0 38.0 29 53.0 3.0 30 58.0 30.0 31 59.0 20.0 32 64.0 47.0 33 73.0 10.0 34 78.0 37.0 35 79.0 27.0 36 84.0 54.0 FULL 45 1 -84.0 -61.0 2 -81.0 -47.0 3 -76.0 -20.0 4 -75.0 -30.0 5 -70.0 -3.0 6 -64.0 -52.0 7 -61.0 -38.0 8 -56.0 -11.0 9 -55.0 -21.0 10 -50.0 6.0 11 -44.0 -43.0 12 -41.0 -29.0 13 -36.0 -2.0 14 -35.0 -12.0 15 -30.0 15.0 16 -26.0 -36.0 17 -23.0 -22.0 18 -18.0 5.0 19 -17.0 -5.0 20 -12.0 22.0 21 -6.0 -29.0 22 -3.0 -15.0 23 2.0 12.0 24 3.0 2.0 25 8.0 20.0 26 14.0 -20.0 27 17.0 -6.0 28 22.0 21.0 29 23.0 11.0 30 28.0 38.0 31 32.0 -13.0 32 35.0 1.0 33 40.0 28.0 34 41.0 18.0 35 46.0 45.0 36 52.0 -4.0 37 55.0 10.0 38 60.0 37.0 39 61.0 27.0 40 66.0 54.0 41 72.0 3.0 42 75.0 17.0 43 80.0 44.0 44 81.0 34.0 45 86.0 61.0 FULLBOX 2TIGHTGAPS 1 -24.8 -3.0 2 24.8 3.0 FULLBOX 3TIGHTGAPS 1 -24.2 -6.0 2 0.0 0.0 3 24.2 6.0 FULLBOX 4TIGHT 1 -24.6 -3.1 2 -24.8 2.9 3 24.6 3.1 4 24.8 -2.9 FULLBOX 4 1 -24.35 -12.58 2 -24.55 12.38 3 24.35 12.58 4 24.55 -12.38 FULLBOX 5TIGHT 1 -24.4 5.3 2 -24.2 -5.5 3 0.0 0.0 4 24.2 5.5 5 24.4 -5.3 FULLBOX 6TIGHT 1 -24.2 -5.5 2 -24.4 5.3 3 -0.1 5.4 4 24.2 5.5 5 24.4 -5.3 6 0.1 -5.4 FULLBOX 6 1 -24.4 -12.55 2 -24.6 12.35 3 -0.1 12.45 4 24.4 12.55 5 24.6 -12.35 6 0.1 -12.45 FULLBOX 8NIRSPEC 1 -24.6 -64.1 2 -24.4 -89.0 3 24.6 -88.8 4 24.4 -63.9 5 24.6 64.1 6 24.4 89.0 7 -24.6 88.8 8 -24.4 63.9 INTRAMODULE 1 -3.75 +3.75 2 +3.75 -3.75 3 +11.25 -11.25 4 -11.25 +11.25 5 +11.25 +11.25 6 -11.25 -11.25 7 -3.75 -3.75 8 3.75 3.75 9 -11.25 3.75 10 11.25 -3.75 11 3.75 -11.25 12 -3.75 11.25 13 -11.25 -3.75 14 11.25 3.75 15 -3.75 -11.25 16 3.75 11.25 INTRAMODULEX 1 -8.82 8.82 2 -2.94 2.94 3 2.94 -2.94 4 8.82 -8.82 5 -8.82 -8.82 6 8.82 8.82 7 2.94 2.94 8 -2.94 -2.94 9 -2.94 -8.82 10 -8.82 -2.94 11 2.94 8.82 12 8.82 2.94 13 8.82 -2.94 14 2.94 -8.82 15 -8.82 2.94 16 -2.94 8.82 INTRAMODULEBOX 1 -2.9 -3.1 2 -3.1 2.9 3 2.9 3.1 4 3.1 -2.9 5 3.3 -8.9 6 -2.7 -9.1 7 -8.7 -9.3 8 -8.9 -3.3 9 -9.1 2.7 10 -9.3 8.7 11 -3.3 8.9 12 2.7 9.1 13 8.7 9.3 14 8.9 3.3 15 9.1 -2.7 16 9.3 -8.7 INTRASCA LARGE 1 0.00 0.00 2 24.56 24.56 3 24.56 -24.56 4 -24.56 -24.56 5 -24.56 24.56 6 0.00 24.56 7 24.56 0.00 8 0.00 -24.56 9 -24.56 0.00 10 -12.28 12.28 11 12.28 12.28 12 12.28 -12.28 13 -12.28 -12.28 14 -12.28 0.00 15 0.00 12.28 16 12.28 0.00 17 0.00 -12.28 18 -12.28 -24.56 19 -24.56 -12.28 20 -24.56 12.28 21 -12.28 24.56 22 12.28 24.56 23 24.56 12.28 24 24.56 -12.28 25 12.28 -24.56 INTRASCA MEDIUM 1 0.00 0.00 2 16.38 16.38 3 16.38 -16.38 4 -16.38 -16.38 5 -16.38 16.38 6 0.00 16.38 7 16.38 0.00 8 0.00 -16.38 9 -16.38 0.00 10 -8.19 8.19 11 8.19 8.19 12 8.19 -8.19 13 -8.19 -8.19 14 -8.19 0.00 15 0.00 8.19 16 8.19 0.00 17 0.00 -8.19 18 -8.19 -16.38 19 -16.38 -8.19 20 -16.38 8.19 21 -8.19 16.38 22 8.19 16.38 23 16.38 8.19 24 16.38 -8.19 25 8.19 -16.38 INTRASCA SMALL 1 0.00 0.00 2 8.19 8.19 3 8.19 -8.19 4 -8.19 -8.19 5 -8.19 8.19 6 0.00 8.19 7 8.19 0.00 8 0.00 -8.19 9 -8.19 0.00 10 -4.09 4.09 11 4.09 4.09 12 4.09 -4.09 13 -4.09 -4.09 14 -4.09 0.00 15 0.00 4.09 16 4.09 0.00 17 0.00 -4.09 18 -4.09 -8.19 19 -8.19 -4.09 20 -8.19 4.09 21 -4.09 8.19 22 4.09 8.19 23 8.19 4.09 24 8.19 -4.09 25 4.09 -8.19 ## Subarray Primary Dither Patterns SUBARRAY 1 -0.335 -0.335 2 +0.335 +0.335 3 -0.295 +0.295 4 +0.295 -0.295 ## Secondary Subpixel Dither Patterns SUBPIXEL 1 1 0 0 SUBPIXEL 2 1 0 0 2 0.240 0.1760 SUBPIXEL 3 1 0 0 2 0.2347 0.0853 3 0.1493 0.2347 SUBPIXEL 4 1 0 0 2 0.160 0.1440 3 0.080 0.2240 4 0.240 0.0480 SUBPIXEL 5 1 0 0 2 0.1024 0.2048 3 0.2048 0.4096 4 0.3072 0.1024 5 0.4096 0.3072 SUBPIXEL 6 1 0 0 2 0.0747 0.1653 3 0.1493 0.2667 4 0.1600 0.0480 5 0.2347 0.2133 6 0.3093 0.1227 SUBPIXEL 7 1 0 0 2 0.0366 0.1692 3 0.1052 0.2743 4 0.1417 0.0913 5 0.2103 0.2606 6 0.2468 0.0457 7 0.3154 0.1508 SUBPIXEL 8 1 0 0 2 0.0320 0.1440 3 0.0800 0.3200 4 0.1440 0.0800 5 0.1680 0.2320 6 0.2960 0.0560 7 0.2800 0.1680 8 0.3120 0.3440 SUBPIXEL 9 1 0 0 2 0.0352 0.1387 3 0.0640 0.3093 4 0.1067 0.0640 5 0.1707 0.1707 6 0.2027 0.3413 7 0.2777 0.0320 8 0.3093 0.1387 9 0.3414 0.3093 SUBPIXEL 10-64 1 0 0 2 0.224 0.080 3 0.080 0.224 4 0.304 0.304 5 0.488 0.000 6 0.712 0.080 7 0.568 0.224 8 0.792 0.304 9 0.768 0.776 10 0.544 0.728 11 0.720 0.552 12 0.496 0.504 13 0.296 0.776 14 0.072 0.728 15 0.248 0.552 16 0.024 0.504 17 -0.188 0.772 18 -0.412 0.724 19 -0.236 0.548 20 -0.460 0.500 21 -0.180 0.292 22 -0.404 0.244 23 -0.228 0.068 24 -0.452 0.020 25 -0.476 -0.468 26 -0.252 -0.388 27 -0.396 -0.244 28 -0.172 -0.164 29 0.012 -0.468 30 0.236 -0.388 31 0.092 -0.244 32 0.316 -0.164 33 0.484 -0.480 34 0.708 -0.400 35 0.564 -0.256 36 0.788 -0.176 37 0.972 -0.480 38 1.196 -0.400 39 1.052 -0.256 40 1.276 -0.176 41 0.964 0.008 42 1.188 0.088 43 1.044 0.232 44 1.268 0.312 45 0.972 0.488 46 1.196 0.568 47 1.052 0.712 48 1.276 0.792 49 1.248 1.252 50 1.024 1.204 51 1.200 1.028 52 0.976 0.980 53 0.776 1.252 54 0.552 1.204 55 0.728 1.028 56 0.504 0.980 57 0.288 1.260 58 0.064 1.212 59 0.240 1.036 60 0.016 0.988 61 -0.184 1.260 62 -0.408 1.212 63 -0.232 1.036 64 -0.456 0.988 ## WFSS Secondary Subpixel Dither Patterns SUBPIXEL WFSS 2 1 0.000 0.000 2 0.618 0.618 SUBPIXEL WFSS 4 1 0.000 0.000 2 0.618 -0.127 3 -0.127 0.618 4 -0.618 -0.618 SUBPIXEL WFSS 9 1 0.000 0.000 2 -0.497 -0.127 3 0.497 -0.254 4 -0.127 -0.497 5 -0.560 -0.560 6 0.560 -0.370 7 -0.254 0.497 8 -0.370 0.560 9 0.370 0.370 ## Imaging Small Grid Dither (SGD) patterns SUBPIXEL SGD 1 1 0.0 0.0 SUBPIXEL SGD 2 1 0.0 0.0 2 0.0156 0.0467 SUBPIXEL SGD 3 1 0.0 0.0 2 0.0207 0.0415 3 0.0415 0.0207 SUBPIXEL SGD 4 1 0.0 0.0 2 -0.0466 -0.0156 3 -0.0155 0.0311 4 0.0312 0.0466 SUBPIXEL SGD 5 1 0.0 0.0 2 0.0249 0.0498 3 0.0436 0.0249 4 0.0187 -0.0248 5 -0.0249 -0.0497 SUBPIXEL SGD 6 1 0.0 0.0 2 0.0104 0.0518 3 0.0518 0.0104 4 0.0207 -0.0363 5 -0.0311 -0.0467 6 -0.0207 0.0052 SUBPIXEL SGD 7 1 0.0 0.0 2 0.0355 0.0400 3 0.0578 -0.0089 4 0.0222 -0.0489 5 -0.0178 -0.0355 6 -0.0444 0.0044 7 -0.0222 0.0489 SUBPIXEL SGD 8 1 0.0 0.0 2 0.0078 -0.0389 3 -0.0389 -0.0544 4 -0.0389 -0.0078 5 -0.0544 0.0389 6 0.0000 0.0467 7 0.0467 0.0467 8 0.0467 0.0000 SUBPIXEL SGD 9 1 0.0 0.0 2 -0.0311 0.0415 3 0.0104 0.0519 4 0.0519 0.0519 5 0.0519 0.0104 6 0.0415 -0.0311 7 0.0000 -0.0414 8 -0.0518 -0.0518 9 -0.0414 0.0000 ## Coronagraphy Small Grid Dither (SGD) patterns 5-POINT-DIAMOND 1 0.000 0.000 2 0.000 0.020 3 0.000 -0.020 4 0.020 0.000 5 -0.020 0.000 5-POINT-BOX 1 0.000 0.000 2 0.015 0.015 3 -0.015 0.015 4 -0.015 -0.015 5 0.015 -0.015 9-POINT-CIRCLE 1 0.000 0.000 2 0.000 0.020 3 -0.015 0.015 4 -0.020 0.000 5 -0.015 -0.015 6 0.000 -0.020 7 0.015 -0.015 8 0.020 0.000 9 0.015 0.015 3-POINT-BAR 1 0.000 0.000 2 0.000 0.015 3 0.000 -0.015 5-POINT-BAR 1 0.000 0.000 2 0.000 0.020 3 0.000 0.010 4 0.000 -0.010 5 0.000 -0.020