Occultation of UCAC5 400-052351 by 554 Peraga on 2019 Apr 12 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 41 0 0 28 8 28 21 7 29 8 106 -1 28 35 35 27 41 22 28 45 8 27 31 50 -0.11 - 40 0 0 27 53 56 21 7 28 9 107 -2 28 21 5 27 26 47 28 30 40 27 17 15 -0.11 - 39 0 0 27 39 1 21 7 27 10 107 -3 28 6 13 27 11 50 28 15 48 27 2 16 -0.11 - 38 0 0 27 23 43 21 7 25 11 107 -4 27 50 58 26 56 29 28 0 35 26 46 54 -0.11 - 37 0 0 27 8 2 21 7 23 12 108 -4 27 35 21 26 40 46 27 44 58 26 31 10 -0.11 - 36 0 0 26 51 59 21 7 21 13 108 -5 27 19 21 26 24 40 27 28 59 26 15 3 -0.11 - 35 0 0 26 35 34 21 7 19 14 109 -6 27 2 58 26 8 11 27 12 37 25 58 33 -0.11 - 34 0 0 26 18 46 21 7 17 15 109 -7 26 46 13 25 51 20 26 55 54 25 41 42 -0.11 - 33 0 0 26 1 36 21 7 15 15 110 -8 26 29 6 25 34 7 26 38 47 25 24 27 -0.11 - 32 0 0 25 44 4 21 7 13 16 110 -9 26 11 37 25 16 32 26 21 19 25 6 51 -0.12 - 31 0 0 25 26 10 21 7 10 17 111 -10 25 53 46 24 58 35 26 3 29 24 48 53 -0.12 - 30 0 0 25 7 54 21 7 7 18 111 -11 25 35 33 24 40 16 25 45 17 24 30 33 -0.12 - 29 0 0 24 49 16 21 7 5 19 111 -12 25 16 58 24 21 36 25 26 44 24 11 52 -0.12 - 28 0 0 24 30 17 21 7 2 20 112 -13 24 58 2 24 2 34 25 7 49 23 52 49 -0.12 - 27 0 0 24 10 57 21 6 58 21 112 -14 24 38 45 23 43 11 24 48 33 23 33 25 -0.12 - 26 0 0 23 51 16 21 6 55 22 113 -15 24 19 7 23 23 27 24 28 56 23 13 40 -0.12 - 25 0 0 23 31 15 21 6 52 23 113 -16 23 59 8 23 3 22 24 8 58 22 53 34 -0.12 - 24 0 0 23 10 52 21 6 48 24 114 -17 23 38 49 22 42 57 23 48 40 22 33 8 -0.12 - 23 0 0 22 50 10 21 6 44 25 114 -18 23 18 9 22 22 12 23 28 1 22 12 22 -0.12 - 22 0 0 22 29 7 21 6 40 26 114 -19 22 57 10 22 1 6 23 7 2 21 51 15 -0.12 - 21 0 0 22 7 45 21 6 36 27 115 -20 22 35 50 21 39 41 22 45 44 21 29 49 -0.12 - 20 0 0 21 46 3 21 6 32 28 115 -21 22 14 11 21 17 57 22 24 6 21 8 4 -0.12 - 19 0 0 21 24 2 21 6 28 29 116 -22 21 52 13 20 55 53 22 2 9 20 45 59 -0.12 - 18 0 0 21 1 43 21 6 23 30 116 -23 21 29 56 20 33 31 21 39 53 20 23 36 -0.12 - 17 0 0 20 39 5 21 6 19 31 116 -24 21 7 21 20 10 50 21 17 18 20 0 54 -0.12 - 16 0 0 20 16 9 21 6 14 32 117 -25 20 44 27 19 47 52 20 54 26 19 37 55 -0.12 - 15 0 0 19 52 55 21 6 9 33 117 -26 20 21 16 19 24 35 20 31 15 19 14 38 -0.12 - 14 0 0 19 29 24 21 6 4 34 117 -27 19 57 47 19 1 2 20 7 48 18 51 3 -0.12 - 13 0 0 19 5 36 21 5 58 35 118 -28 19 34 2 18 37 11 19 44 3 18 27 12 -0.12 - 12 0 0 18 41 31 21 5 53 36 118 -29 19 10 0 18 13 4 19 20 1 18 3 4 -0.12 - 11 0 0 18 17 10 21 5 47 37 119 -30 18 45 41 17 48 41 18 55 44 17 38 40 -0.12 - 10 0 0 17 52 34 21 5 41 38 119 -31 18 21 7 17 24 3 18 31 10 17 14 1 -0.12 - 9 0 0 17 27 42 21 5 35 39 119 -32 17 56 18 16 59 9 18 6 22 16 49 7 -0.12 - 8 0 0 17 2 36 21 5 29 40 120 -33 17 31 13 16 34 1 17 41 18 16 23 58 -0.12 - 7 0 0 16 37 16 21 5 23 41 120 -34 17 5 55 16 8 38 17 16 0 15 58 34 -0.12 - 6 0 0 16 11 41 21 5 17 42 120 -35 16 40 22 15 43 2 16 50 29 15 32 58 -0.12 - 5 0 0 15 45 54 21 5 10 43 121 -36 16 14 37 15 17 13 16 24 44 15 7 8 -0.12 - 4 0 0 15 19 54 21 5 4 44 121 -37 15 48 38 14 51 11 15 58 46 14 41 5 -0.12 - 3 0 0 14 53 42 21 4 57 45 122 -38 15 22 28 14 24 58 15 32 36 14 14 51 -0.12 - 2 0 0 14 27 18 21 4 50 46 122 -39 14 56 6 13 58 32 15 6 14 13 48 25 -0.12 - 1 0 0 14 0 43 21 4 43 47 122 -40 14 29 32 13 31 56 14 39 41 13 21 48 -0.12 0 0 0 13 33 58 21 4 36 48 123 -41 14 2 48 13 5 9 14 12 58 12 55 1 -0.12 1 0 0 13 7 3 21 4 28 49 123 -42 13 35 54 12 38 13 13 46 4 12 28 5 -0.12 2 0 0 12 39 58 21 4 21 50 123 -43 13 8 51 12 11 8 13 19 2 12 0 59 -0.12 3 0 0 12 12 45 21 4 13 51 124 -44 12 41 39 11 43 54 12 51 50 11 33 44 -0.12 4 0 0 11 45 24 21 4 6 52 124 -45 12 14 19 11 16 32 12 24 30 11 6 22 -0.12 5 0 0 11 17 56 21 3 58 53 125 -46 11 46 52 10 49 2 11 57 3 10 38 53 -0.12 6 0 0 10 50 21 21 3 50 54 125 -47 11 19 17 10 21 27 11 29 29 10 11 17 -0.12 7 0 0 10 22 40 21 3 42 55 125 -48 10 51 36 9 53 45 11 1 48 9 43 34 -0.12 8 0 0 9 54 53 21 3 34 56 126 -49 10 23 50 9 25 57 10 34 2 9 15 47 -0.12 9 0 0 9 27 1 21 3 25 57 126 -50 9 55 59 8 58 6 10 6 11 8 47 55 -0.12 10 0 0 8 59 6 21 3 17 59 127 -51 9 28 4 8 30 10 9 38 16 8 19 59 -0.12 11 0 0 8 31 7 21 3 8 60 127 -52 9 0 5 8 2 10 9 10 17 7 52 0 -0.12 12 0 0 8 3 5 21 3 0 61 128 -54 8 32 3 7 34 8 8 42 15 7 23 58 -0.12 13 0 0 7 35 0 21 2 51 62 128 -55 8 3 59 7 6 4 8 14 11 6 55 54 -0.12 14 0 0 7 6 55 21 2 42 63 129 -56 7 35 53 6 37 59 7 46 5 6 27 48 -0.12 15 0 0 6 38 49 21 2 33 64 129 -57 7 7 46 6 9 53 7 17 59 5 59 42 -0.12 16 0 0 6 10 42 21 2 24 65 130 -58 6 39 40 5 41 47 6 49 52 5 31 36 -0.12 17 0 0 5 42 36 21 2 15 66 131 -59 6 11 33 5 13 41 6 21 45 5 3 31 -0.12 18 0 0 5 14 32 21 2 6 67 131 -60 5 43 28 4 45 37 5 53 40 4 35 27 -0.12 19 0 0 4 46 29 21 1 57 68 132 -61 5 15 25 4 17 35 5 25 36 4 7 25 -0.12 20 0 0 4 18 29 21 1 48 69 133 -62 4 47 24 3 49 36 4 57 35 3 39 26 -0.12 21 0 0 3 50 32 21 1 38 70 134 -63 4 19 26 3 21 40 4 29 37 3 11 31 -0.12 22 0 0 3 22 39 21 1 29 71 135 -64 3 51 32 2 53 48 4 1 42 2 43 39 -0.12 23 0 0 2 54 50 21 1 20 72 136 -65 3 23 42 2 26 0 3 33 52 2 15 52 -0.12 24 0 0 2 27 7 21 1 10 73 137 -66 2 55 58 1 58 18 3 6 7 1 48 10 -0.12 25 0 0 1 59 30 21 1 0 74 139 -67 2 28 19 1 30 42 2 38 28 1 20 34 -0.12 26 0 0 1 31 59 21 0 51 75 140 -68 2 0 47 1 3 13 2 10 56 0 53 5 -0.12 27 0 0 1 4 35 21 0 41 76 142 -69 1 33 22 0 35 50 1 43 30 0 25 44 -0.12 28 0 0 0 37 19 21 0 32 77 144 -71 1 6 4 0 8 36 1 16 12 - 0 1 30 -0.12 29 0 0 0 10 11 21 0 22 78 147 -72 0 38 55 - 0 18 30 0 49 2 - 0 28 36 -0.12 30 0 0 - 0 16 48 21 0 12 78 149 -73 0 11 54 - 0 45 27 0 22 1 - 0 55 32 -0.12 31 0 0 - 0 43 37 21 0 3 79 153 -74 - 0 14 57 - 1 12 15 - 0 4 51 - 1 22 19 -0.12 32 0 0 - 1 10 16 20 59 53 80 156 -75 - 0 41 38 - 1 38 52 - 0 31 33 - 1 48 56 -0.12 33 0 0 - 1 36 44 20 59 43 81 161 -76 - 1 8 8 - 2 5 19 - 0 58 4 - 2 15 22 -0.12 34 0 0 - 2 3 2 20 59 33 82 166 -77 - 1 34 27 - 2 31 34 - 1 24 24 - 2 41 36 -0.12 35 0 0 - 2 29 7 20 59 24 82 172 -78 - 2 0 35 - 2 57 37 - 1 50 32 - 3 7 39 -0.12 36 0 0 - 2 55 0 20 59 14 83 179 -79 - 2 26 30 - 3 23 28 - 2 16 28 - 3 33 29 -0.12 37 0 0 - 3 20 40 20 59 4 83 187 -80 - 2 52 12 - 3 49 6 - 2 42 11 - 3 59 6 -0.12 38 0 0 - 3 46 7 20 58 54 83 195 -81 - 3 17 41 - 4 14 30 - 3 7 41 - 4 24 30 -0.12 39 0 0 - 4 11 20 20 58 45 83 204 -82 - 3 42 57 - 4 39 41 - 3 32 57 - 4 49 40 -0.12 40 0 0 - 4 36 18 20 58 35 83 213 -83 - 4 7 58 - 5 4 37 - 3 57 59 - 5 14 35 -0.12 41 0 0 - 5 1 2 20 58 25 83 221 -84 - 4 32 44 - 5 29 19 - 4 22 46 - 5 39 15 -0.11 42 0 0 - 5 25 30 20 58 16 83 229 -85 - 4 57 15 - 5 53 45 - 4 47 17 - 6 3 40 -0.11 43 0 0 - 5 49 43 20 58 6 82 236 -86 - 5 21 30 - 6 17 55 - 5 11 33 - 6 27 50 -0.11 44 0 0 - 6 13 40 20 57 56 82 241 -87 - 5 45 29 - 6 41 49 - 5 35 33 - 6 51 43 -0.11 45 0 0 - 6 37 20 20 57 47 81 246 -88 - 6 9 11 - 7 5 26 - 5 59 17 - 7 15 19 -0.11 46 0 0 - 7 0 43 20 57 37 80 250 -88 - 6 32 37 - 7 28 46 - 6 22 43 - 7 38 39 -0.11 47 0 0 - 7 23 48 20 57 28 79 254 -88 - 6 55 45 - 7 51 49 - 6 45 52 - 8 1 41 -0.11 48 0 0 - 7 46 36 20 57 18 79 257 -88 - 7 18 36 - 8 14 34 - 7 8 44 - 8 24 25 -0.11 49 0 0 - 8 9 6 20 57 9 78 259 -87 - 7 41 8 - 8 37 1 - 7 31 17 - 8 46 51 -0.11 50 0 0 - 8 31 17 20 57 0 77 262 -86 - 8 3 22 - 8 59 10 - 7 53 32 - 9 8 58 -0.11 51 0 0 - 8 53 9 20 56 50 76 263 -85 - 8 25 17 - 9 20 59 - 8 15 28 - 9 30 47 -0.11 52 0 0 - 9 14 42 20 56 41 75 265 -84 - 8 46 53 - 9 42 30 - 8 37 5 - 9 52 17 -0.11 53 0 0 - 9 35 56 20 56 32 74 266 -83 - 9 8 10 -10 3 41 - 8 58 23 -10 13 27 -0.11 54 0 0 - 9 56 50 20 56 23 73 268 -82 - 9 29 6 -10 24 32 - 9 19 20 -10 34 17 -0.11 55 0 0 -10 17 24 20 56 14 72 269 -81 - 9 49 43 -10 45 3 - 9 39 58 -10 54 47 -0.11 56 0 0 -10 37 38 20 56 5 71 269 -80 -10 10 0 -11 5 14 -10 0 16 -11 14 57 -0.11 57 0 0 -10 57 31 20 55 56 70 270 -79 -10 29 55 -11 25 4 -10 20 12 -11 34 46 -0.11 58 0 0 -11 17 3 20 55 48 69 271 -78 -10 49 30 -11 44 34 -10 39 48 -11 54 15 -0.11 59 0 0 -11 36 14 20 55 39 68 272 -77 -11 8 44 -12 3 42 -10 59 3 -12 13 22 -0.11 60 0 0 -11 55 4 20 55 30 67 272 -76 -11 27 37 -12 22 29 -11 17 57 -12 32 8 -0.11 61 0 0 -12 13 32 20 55 22 66 272 -75 -11 46 8 -12 40 55 -11 36 29 -12 50 33 -0.11 62 0 0 -12 31 39 20 55 13 66 273 -74 -12 4 17 -12 58 59 -11 54 39 -13 8 36 -0.11 63 0 0 -12 49 23 20 55 5 65 273 -73 -12 22 5 -13 16 41 -12 12 27 -13 26 16 -0.11 64 0 0 -13 6 46 20 54 56 64 273 -72 -12 39 30 -13 34 0 -12 29 53 -13 43 35 -0.11 65 0 0 -13 23 46 20 54 48 63 274 -71 -12 56 33 -13 50 58 -12 46 57 -14 0 32 -0.11 66 0 0 -13 40 24 20 54 40 62 274 -70 -13 13 13 -14 7 33 -13 3 39 -14 17 6 -0.11 67 0 0 -13 56 39 20 54 32 61 274 -69 -13 29 31 -14 23 45 -13 19 57 -14 33 18 -0.11 68 0 0 -14 12 31 20 54 24 60 274 -68 -13 45 26 -14 39 35 -13 35 53 -14 49 6 -0.11 69 0 0 -14 28 0 20 54 16 59 274 -67 -14 0 58 -14 55 2 -13 51 26 -15 4 32 -0.11 70 0 0 -14 43 7 20 54 9 58 274 -66 -14 16 6 -15 10 6 -14 6 36 -15 19 35 -0.11 71 0 0 -14 57 50 20 54 1 57 274 -65 -14 30 52 -15 24 46 -14 21 22 -15 34 15 -0.11 72 0 0 -15 12 10 20 53 53 56 274 -64 -14 45 14 -15 39 4 -14 35 45 -15 48 32 -0.11 73 0 0 -15 26 6 20 53 46 55 274 -64 -14 59 13 -15 52 58 -14 49 45 -16 2 25 -0.11 74 0 0 -15 39 39 20 53 39 54 274 -63 -15 12 48 -16 6 28 -15 3 21 -16 15 54 -0.11 75 0 0 -15 52 48 20 53 31 53 274 -62 -15 26 0 -16 19 35 -15 16 33 -16 29 1 -0.11 76 0 0 -16 5 34 20 53 24 52 274 -61 -15 38 47 -16 32 18 -15 29 22 -16 41 43 -0.11 77 0 0 -16 17 55 20 53 17 51 274 -60 -15 51 11 -16 44 38 -15 41 46 -16 54 2 -0.11 78 0 0 -16 29 53 20 53 10 50 274 -59 -16 3 11 -16 56 34 -15 53 47 -17 5 57 -0.11 79 0 0 -16 41 27 20 53 4 49 274 -58 -16 14 47 -17 8 5 -16 5 24 -17 17 28 -0.11 80 0 0 -16 52 37 20 52 57 48 274 -57 -16 25 59 -17 19 13 -16 16 36 -17 28 34 -0.11 81 0 0 -17 3 22 20 52 50 47 273 -56 -16 36 46 -17 29 56 -16 27 24 -17 39 17 -0.11 82 0 0 -17 13 44 20 52 44 47 273 -55 -16 47 10 -17 40 16 -16 37 48 -17 49 36 -0.11 83 0 0 -17 23 41 20 52 37 46 273 -54 -16 57 9 -17 50 11 -16 47 48 -17 59 31 -0.11 84 0 0 -17 33 13 20 52 31 45 273 -53 -17 6 43 -17 59 42 -16 57 23 -18 9 1 -0.11 85 0 0 -17 42 22 20 52 25 44 273 -52 -17 15 53 -18 8 49 -17 6 34 -18 18 7 -0.11 86 0 0 -17 51 6 20 52 19 43 273 -51 -17 24 39 -18 17 31 -17 15 20 -18 26 49 -0.11 87 0 0 -17 59 25 20 52 13 42 272 -50 -17 33 0 -18 25 49 -17 23 42 -18 35 6 -0.11 88 0 0 -18 7 20 20 52 7 41 272 -49 -17 40 56 -18 33 42 -17 31 38 -18 42 59 -0.11 89 0 0 -18 14 50 20 52 2 40 272 -48 -17 48 28 -18 41 11 -17 39 11 -18 50 27 -0.11 90 0 0 -18 21 56 20 51 56 39 272 -47 -17 55 35 -18 48 16 -17 46 18 -18 57 31 -0.11 91 0 0 -18 28 37 20 51 51 38 271 -47 -18 2 17 -18 54 55 -17 53 1 -19 4 11 -0.11 92 0 0 -18 34 53 20 51 45 37 271 -46 -18 8 35 -19 1 10 -17 59 19 -19 10 25 -0.11 93 0 0 -18 40 45 20 51 40 36 271 -45 -18 14 27 -19 7 1 -18 5 12 -19 16 15 -0.11 94 0 0 -18 46 12 20 51 35 35 271 -44 -18 19 55 -19 12 26 -18 10 40 -19 21 40 -0.11 95 0 0 -18 51 13 20 51 30 34 270 -43 -18 24 58 -19 17 27 -18 15 43 -19 26 41 -0.11 96 0 0 -18 55 50 20 51 25 34 270 -42 -18 29 36 -19 22 3 -18 20 21 -19 31 17 -0.11 97 0 0 -19 0 2 20 51 20 33 270 -41 -18 33 49 -19 26 15 -18 24 34 -19 35 28 -0.12 98 0 0 -19 3 49 20 51 16 32 270 -40 -18 37 37 -19 30 1 -18 28 23 -19 39 14 -0.12 99 0 0 -19 7 11 20 51 11 31 269 -39 -18 40 59 -19 33 22 -18 31 45 -19 42 35 -0.12 100 0 0 -19 10 8 20 51 7 30 269 -38 -18 43 57 -19 36 19 -18 34 43 -19 45 31 -0.12 101 0 0 -19 12 40 20 51 2 29 269 -37 -18 46 29 -19 38 50 -18 37 16 -19 48 2 -0.12 102 0 0 -19 14 47 20 50 58 28 268 -36 -18 48 36 -19 40 57 -18 39 23 -19 50 9 -0.12 103 0 0 -19 16 29 20 50 54 27 268 -35 -18 50 18 -19 42 38 -18 41 5 -19 51 50 -0.12 104 0 0 -19 17 45 20 50 50 26 268 -34 -18 51 35 -19 43 54 -18 42 22 -19 53 6 -0.12 105 0 0 -19 18 36 20 50 47 25 268 -33 -18 52 26 -19 44 45 -18 43 13 -19 53 57 -0.12 106 0 0 -19 19 2 20 50 43 24 267 -33 -18 52 52 -19 45 11 -18 43 39 -19 54 23 -0.12 107 0 0 -19 19 3 20 50 39 23 267 -32 -18 52 53 -19 45 12 -18 43 40 -19 54 23 -0.12 108 0 0 -19 18 38 20 50 36 22 267 -31 -18 52 28 -19 44 47 -18 43 15 -19 53 59 -0.12 109 0 0 -19 17 48 20 50 33 21 266 -30 -18 51 38 -19 43 57 -18 42 24 -19 53 9 -0.12 110 0 0 -19 16 32 20 50 30 21 266 -29 -18 50 22 -19 42 42 -18 41 8 -19 51 54 -0.12 111 0 0 -19 14 51 20 50 27 20 266 -28 -18 48 40 -19 41 1 -18 39 27 -19 50 13 -0.12 112 0 0 -19 12 45 20 50 24 19 265 -27 -18 46 33 -19 38 55 -18 37 19 -19 48 7 -0.12 113 0 0 -19 10 12 20 50 21 18 265 -26 -18 44 0 -19 36 23 -18 34 46 -19 45 36 -0.12 114 0 0 -19 7 15 20 50 19 17 265 -25 -18 41 2 -19 33 26 -18 31 48 -19 42 39 -0.12 115 0 0 -19 3 51 20 50 16 16 264 -24 -18 37 37 -19 30 3 -18 28 23 -19 39 16 -0.12 116 0 0 -19 0 2 20 50 14 15 264 -23 -18 33 47 -19 26 15 -18 24 33 -19 35 28 -0.12 117 0 0 -18 55 47 20 50 12 14 264 -22 -18 29 31 -19 22 1 -18 20 17 -19 31 15 -0.12 118 0 0 -18 51 6 20 50 9 13 264 -21 -18 24 50 -19 17 21 -18 15 34 -19 26 35 -0.12 119 0 0 -18 46 0 20 50 8 12 263 -20 -18 19 42 -19 12 16 -18 10 26 -19 21 30 -0.12 120 0 0 -18 40 27 20 50 6 11 263 -19 -18 14 8 -19 6 45 -18 4 52 -19 15 59 -0.12 121 0 0 -18 34 29 20 50 4 10 263 -19 -18 8 9 -19 0 47 -17 58 52 -19 10 3 -0.12 122 0 0 -18 28 4 20 50 3 9 262 -18 -18 1 43 -18 54 24 -17 52 26 -19 3 40 -0.12 123 0 0 -18 21 14 20 50 1 8 262 -17 -17 54 51 -18 47 36 -17 45 34 -18 56 52 -0.12 124 0 0 -18 13 58 20 50 0 7 262 -16 -17 47 33 -18 40 21 -17 38 15 -18 49 38 -0.12 125 0 0 -18 6 15 20 49 59 6 261 -15 -17 39 49 -18 32 40 -17 30 30 -18 41 57 -0.12 126 0 0 -17 58 7 20 49 58 5 261 -14 -17 31 39 -18 24 33 -17 22 19 -18 33 51 -0.12 127 0 0 -17 49 32 20 49 57 4 261 -13 -17 23 2 -18 16 0 -17 13 42 -18 25 19 -0.12 128 0 0 -17 40 31 20 49 57 4 260 -12 -17 13 59 -18 7 1 -17 4 38 -18 16 20 -0.12 129 0 0 -17 31 4 20 49 56 3 260 -11 -17 4 30 -17 57 36 -16 55 9 -18 6 56 -0.12 130 0 0 -17 21 10 20 49 56 2 260 -10 -16 54 34 -17 47 44 -16 45 12 -17 57 5 -0.12 131 0 0 -17 10 50 20 49 56 1 260 -9 -16 44 12 -17 37 27 -16 34 50 -17 46 48 -0.12 Uncertainty in time = +/- 2 secs Prediction of 2018 May 17.1