IOTA/IOTA-ES occultation update for (142) Polana / 2UCAC 34575922 event on 2012 Sep 05, 11:39 UT Visible from NW Canada, Alaska, Japan Summary ------- On 2012 Sep 05 UT, the 50 km diameter asteroid (142) Polana will occult a 12.2 mag star in the constellation Pisces for observers along a path across NW Canada, Alaska, Japan. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 14.3 mag (the magnitude of the asteroid) for at most 5.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 36 * date and approx. time of event: 2012 Sep 05, 11:26 - 2012 Sep 05, 11:40 UT * geocentric midpoint of event [JD]: 2456175.98097917 * magnitude of target star: 12.2 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 5.5 * Moon: 77 % sunlit, 27° distance * Sun: 150° distance * rough path description: NW Canada, Alaska, Japan The occultation path -------------------- * approximate projected width [km]: 74 * 1 sigma uncertainty interval [path widths]: +/- 1.83 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .076) * 1 sigma uncertainty ellipse (major, minor, PA): ( .076", .039", 359° ) * approx speed of asteroid's shadow [km/s]: 9.1527 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 34575922 by 142 Polana on 2012 Sep 5 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 117 0 0 29 40 1 11 40 25 1 81 -16 30 0 25 29 19 45 31 16 16 .. .. .. 118 0 0 29 49 19 11 40 25 2 82 -17 30 9 45 29 29 2 31 25 42 .. .. .. 119 0 0 29 59 3 11 40 24 3 82 -17 30 19 30 29 38 44 31 35 33 .. .. .. 120 0 0 30 9 12 11 40 23 3 83 -18 30 29 41 29 48 52 31 45 50 .. .. .. 121 0 0 30 19 46 11 40 22 4 83 -19 30 40 16 29 59 24 31 56 32 .. .. .. 122 0 0 30 30 44 11 40 21 5 84 -20 30 51 16 30 10 20 32 7 39 .. .. .. 123 0 0 30 42 7 11 40 19 6 84 -20 31 2 41 30 21 41 32 19 11 .. .. .. 124 0 0 30 53 53 11 40 18 7 85 -21 31 14 29 30 33 25 32 31 6 .. .. .. 125 0 0 31 6 3 11 40 16 8 85 -22 31 26 41 30 45 33 32 43 26 29 31 40 126 0 0 31 18 36 11 40 13 9 86 -23 31 39 16 30 58 4 32 56 9 29 44 4 127 0 0 31 31 32 11 40 11 9 86 -23 31 52 14 31 10 58 33 9 15 29 56 51 128 0 0 31 44 51 11 40 8 10 87 -24 32 5 35 31 24 15 33 22 44 30 10 0 129 0 0 31 58 32 11 40 5 11 87 -25 32 19 18 31 37 54 33 36 36 30 23 31 130 0 0 32 12 34 11 40 2 12 88 -25 32 33 23 31 51 54 33 50 50 30 37 23 131 0 0 32 26 59 11 39 59 13 88 -26 32 47 50 32 6 16 34 5 26 30 51 37 132 0 0 32 41 44 11 39 55 14 89 -27 33 2 38 32 20 59 34 20 23 31 6 12 133 0 0 32 56 50 11 39 51 15 90 -27 33 17 46 32 36 3 34 35 41 31 21 7 134 0 0 33 12 17 11 39 47 15 90 -28 33 33 15 32 51 27 34 51 20 31 36 22 135 0 0 33 28 3 11 39 43 16 91 -28 33 49 4 33 7 10 35 7 19 31 51 58 136 0 0 33 44 9 11 39 38 17 91 -29 34 5 13 33 23 14 35 23 38 32 7 52 137 0 0 34 0 34 11 39 34 18 92 -29 34 21 41 33 39 36 35 40 16 32 24 5 138 0 0 34 17 18 11 39 29 19 93 -30 34 38 27 33 56 17 35 57 13 32 40 37 139 0 0 34 34 20 11 39 24 19 93 -30 34 55 32 34 13 17 36 14 29 32 57 27 140 0 0 34 51 40 11 39 19 20 94 -31 35 12 55 34 30 34 36 32 2 33 14 35 141 0 0 35 9 17 11 39 13 21 95 -31 35 30 35 34 48 8 36 49 53 33 31 59 142 0 0 35 27 11 11 39 8 22 95 -32 35 48 32 35 6 0 37 8 1 33 49 41 143 0 0 35 45 22 11 39 2 22 96 -32 36 6 45 35 24 7 37 26 26 34 7 39 144 0 0 36 3 48 11 38 56 23 97 -33 36 25 15 35 42 31 37 45 7 34 25 52 145 0 0 36 22 30 11 38 50 24 98 -33 36 43 59 36 1 10 38 4 3 34 44 21 146 0 0 36 41 27 11 38 43 25 98 -34 37 2 59 36 20 4 38 23 14 35 3 5 147 0 0 37 0 38 11 38 37 25 99 -34 37 22 14 36 39 12 38 42 40 35 22 3 148 0 0 37 20 3 11 38 30 26 100 -34 37 41 42 36 58 35 39 2 20 35 41 16 149 0 0 37 39 42 11 38 23 27 101 -35 38 1 24 37 18 10 39 22 14 36 0 41 150 0 0 37 59 34 11 38 17 28 102 -35 38 21 18 37 37 59 39 42 20 36 20 19 151 0 0 38 19 38 11 38 9 28 102 -35 38 41 25 37 58 0 40 2 39 36 40 10 152 0 0 38 39 53 11 38 2 29 103 -35 39 1 44 38 18 13 40 23 9 37 0 13 153 0 0 39 0 20 11 37 55 30 104 -36 39 22 14 38 38 37 40 43 51 37 20 26 154 0 0 39 20 58 11 37 48 30 105 -36 39 42 55 38 59 12 41 4 44 37 40 51 155 0 0 39 41 46 11 37 40 31 106 -36 40 3 46 39 19 57 41 25 46 38 1 26 156 0 0 40 2 43 11 37 32 31 107 -36 40 24 46 39 40 51 41 46 58 38 22 10 157 0 0 40 23 50 11 37 24 32 108 -36 40 45 55 40 1 55 42 8 19 38 43 3 158 0 0 40 45 5 11 37 17 33 109 -37 41 7 13 40 23 7 42 29 49 39 4 5 159 0 0 41 6 28 11 37 9 33 110 -37 41 28 39 40 44 26 42 51 26 39 25 15 160 0 0 41 27 58 11 37 0 34 111 -37 41 50 12 41 5 54 43 13 10 39 46 33 161 0 0 41 49 34 11 36 52 34 112 -37 42 11 51 41 27 28 43 35 1 40 7 57 162 0 0 42 11 17 11 36 44 35 113 -37 42 33 37 41 49 8 43 56 57 40 29 28 163 0 0 42 33 5 11 36 36 35 114 -37 42 55 28 42 10 53 44 18 59 40 51 4 164 0 0 42 54 58 11 36 27 36 115 -37 43 17 24 42 32 44 44 41 6 41 12 45 165 0 0 43 16 56 11 36 19 36 116 -37 43 39 24 42 54 39 45 3 17 41 34 31 166 0 0 43 38 57 11 36 10 37 118 -37 44 1 28 43 16 37 45 25 31 41 56 21 167 0 0 44 1 1 11 36 2 37 119 -37 44 23 35 43 38 39 45 47 48 42 18 14 168 0 0 44 23 8 11 35 53 38 120 -37 44 45 44 44 0 43 46 10 7 42 40 10 169 0 0 44 45 17 11 35 44 38 121 -37 45 7 55 44 22 50 46 32 27 43 2 8 170 0 0 45 7 27 11 35 36 38 122 -37 45 30 8 44 44 57 46 54 49 43 24 7 171 0 0 45 29 38 11 35 27 39 123 -36 45 52 21 45 7 6 47 17 11 43 46 8 172 0 0 45 51 49 11 35 18 39 125 -36 46 14 34 45 29 14 47 39 33 44 8 9 173 0 0 46 13 59 11 35 10 39 126 -36 46 36 46 45 51 23 48 1 54 44 30 11 174 0 0 46 36 8 11 35 1 40 127 -36 46 58 58 46 13 30 48 24 13 44 52 11 175 0 0 46 58 16 11 34 52 40 129 -36 47 21 7 46 35 36 48 46 30 45 14 10 176 0 0 47 20 22 11 34 43 40 130 -35 47 43 15 46 57 40 49 8 45 45 36 8 177 0 0 47 42 24 11 34 34 41 131 -35 48 5 19 47 19 41 49 30 56 45 58 3 178 0 0 48 4 24 11 34 26 41 132 -35 48 27 20 47 41 38 49 53 4 46 19 55 179 0 0 48 26 19 11 34 17 41 134 -35 48 49 17 48 3 32 50 15 7 46 41 44 180 0 0 48 48 10 11 34 8 41 135 -34 49 11 10 48 25 22 50 37 5 47 3 29 -179 0 0 49 9 56 11 33 59 41 136 -34 49 32 57 48 47 7 50 58 58 47 25 9 -178 0 0 49 31 37 11 33 51 42 138 -34 49 54 39 49 8 46 51 20 44 47 46 44 -177 0 0 49 53 11 11 33 42 42 139 -34 50 16 15 49 30 20 51 42 24 48 8 14 -176 0 0 50 14 39 11 33 33 42 141 -33 50 37 44 49 51 47 52 3 57 48 29 38 -175 0 0 50 36 0 11 33 25 42 142 -33 50 59 6 50 13 7 52 25 22 48 50 55 -174 0 0 50 57 14 11 33 16 42 143 -33 51 20 20 50 34 20 52 46 39 49 12 5 -173 0 0 51 18 19 11 33 8 42 145 -32 51 41 26 50 55 24 53 7 48 49 33 8 -172 0 0 51 39 16 11 32 59 42 146 -32 52 2 23 51 16 21 53 28 47 49 54 3 -171 0 0 52 0 4 11 32 51 42 147 -32 52 23 12 51 37 9 53 49 37 50 14 49 -170 0 0 52 20 43 11 32 43 42 149 -31 52 43 51 51 57 47 54 10 17 50 35 27 -169 0 0 52 41 12 11 32 34 42 150 -31 53 4 20 52 18 16 54 30 46 50 55 55 -168 0 0 53 1 31 11 32 26 42 152 -30 53 24 38 52 38 35 54 51 5 51 16 14 -167 0 0 53 21 39 11 32 18 42 153 -30 53 44 46 52 58 43 55 11 12 51 36 23 -166 0 0 53 41 36 11 32 10 42 154 -30 54 4 43 53 18 40 55 31 8 51 56 21 -165 0 0 54 1 22 11 32 2 42 156 -29 54 24 29 53 38 27 55 50 52 52 16 9 -164 0 0 54 20 56 11 31 54 42 157 -29 54 44 2 53 58 1 56 10 24 52 35 45 -163 0 0 54 40 18 11 31 46 42 159 -28 55 3 24 54 17 24 56 29 43 52 55 10 -162 0 0 54 59 28 11 31 38 42 160 -28 55 22 33 54 36 35 56 48 49 53 14 23 -161 0 0 55 18 25 11 31 31 42 161 -27 55 41 29 54 55 33 57 7 41 53 33 24 -160 0 0 55 37 9 11 31 23 42 163 -27 56 0 13 55 14 18 57 26 21 53 52 13 -159 0 0 55 55 41 11 31 16 41 164 -27 56 18 43 55 32 50 57 44 46 54 10 49 -158 0 0 56 13 58 11 31 8 41 165 -26 56 36 59 55 51 9 58 2 57 54 29 12 -157 0 0 56 32 2 11 31 1 41 167 -26 56 55 1 56 9 15 58 20 55 54 47 22 -156 0 0 56 49 52 11 30 53 41 168 -25 57 12 50 56 27 6 58 38 37 55 5 19 -155 0 0 57 7 28 11 30 46 41 169 -25 57 30 24 56 44 44 58 56 5 55 23 2 -154 0 0 57 24 50 11 30 39 41 171 -24 57 47 44 57 2 7 59 13 18 55 40 31 -153 0 0 57 41 57 11 30 32 40 172 -24 58 4 49 57 19 16 59 30 17 55 57 46 -152 0 0 57 58 49 11 30 25 40 173 -23 58 21 40 57 36 10 59 47 0 56 14 47 -151 0 0 58 15 27 11 30 19 40 174 -23 58 38 16 57 52 50 60 3 27 56 31 33 -150 0 0 58 31 50 11 30 12 40 176 -22 58 54 36 58 9 14 60 19 39 56 48 5 -149 0 0 58 47 57 11 30 5 39 177 -22 59 10 42 58 25 24 60 35 36 57 4 22 -148 0 0 59 3 50 11 29 59 39 178 -22 59 26 32 58 41 19 60 51 17 57 20 24 -147 0 0 59 19 27 11 29 52 39 179 -21 59 42 6 58 56 58 61 6 43 57 36 12 -146 0 0 59 34 49 11 29 46 39 181 -21 59 57 26 59 12 22 61 21 53 57 51 44 -145 0 0 59 49 55 11 29 40 38 182 -20 60 12 30 59 27 31 61 36 46 58 7 2 -144 0 0 60 4 46 11 29 34 38 183 -20 60 27 18 59 42 25 61 51 25 58 22 4 -143 0 0 60 19 21 11 29 27 38 184 -19 60 41 51 59 57 3 62 5 47 58 36 51 -142 0 0 60 33 41 11 29 22 38 186 -19 60 56 8 60 11 25 62 19 53 58 51 23 -141 0 0 60 47 45 11 29 16 37 187 -18 61 10 9 60 25 32 62 33 44 59 5 39 -140 0 0 61 1 34 11 29 10 37 188 -18 61 23 55 60 39 23 62 47 18 59 19 40 -139 0 0 61 15 7 11 29 4 37 189 -17 61 37 25 60 52 59 63 0 37 59 33 26 -138 0 0 61 28 24 11 28 59 36 190 -17 61 50 39 61 6 20 63 13 40 59 46 56 -137 0 0 61 41 26 11 28 53 36 192 -17 62 3 38 61 19 24 63 26 28 60 0 11 -136 0 0 61 54 12 11 28 48 36 193 -16 62 16 22 61 32 14 63 38 59 60 13 10 -135 0 0 62 6 43 11 28 42 35 194 -16 62 28 49 61 44 47 63 51 15 60 25 54 -134 0 0 62 18 58 11 28 37 35 195 -15 62 41 1 61 57 5 64 3 15 60 38 23 -133 0 0 62 30 58 11 28 32 35 196 -15 62 52 58 62 9 8 64 15 0 60 50 36 -132 0 0 62 42 43 11 28 27 35 197 -14 63 4 39 62 20 56 64 26 29 61 2 34 -131 0 0 62 54 12 11 28 22 34 198 -14 63 16 5 62 32 28 64 37 43 61 14 17 -130 0 0 63 5 25 11 28 17 34 199 -13 63 27 16 62 43 45 64 48 41 61 25 44 -129 0 0 63 16 24 11 28 12 34 201 -13 63 38 11 62 54 46 64 59 24 61 36 56 -128 0 0 63 27 7 11 28 7 33 202 -12 63 48 52 63 5 33 65 9 52 61 47 53 -127 0 0 63 37 36 11 28 3 33 203 -12 63 59 17 63 16 4 65 20 5 61 58 36 -126 0 0 63 47 49 11 27 58 33 204 -12 64 9 27 63 26 21 65 30 4 62 9 3 -125 0 0 63 57 48 11 27 54 32 205 -11 64 19 22 63 36 22 65 39 47 62 19 15 -124 0 0 64 7 31 11 27 49 32 206 -11 64 29 3 63 46 9 65 49 15 62 29 12 -123 0 0 64 17 0 11 27 45 32 207 -10 64 38 29 63 55 41 65 58 29 62 38 55 -122 0 0 64 26 14 11 27 40 31 208 -10 64 47 40 64 4 58 66 7 29 62 48 22 -121 0 0 64 35 14 11 27 36 31 209 -9 64 56 37 64 14 1 66 16 13 62 57 35 -120 0 0 64 44 0 11 27 32 31 210 -9 65 5 19 64 22 49 66 24 44 63 6 34 -119 0 0 64 52 31 11 27 28 30 211 -9 65 13 47 64 31 23 66 33 1 63 15 18 -118 0 0 65 0 47 11 27 24 30 212 -8 65 22 1 64 39 43 66 41 3 63 23 48 -117 0 0 65 8 50 11 27 20 30 214 -8 65 30 1 64 47 48 66 48 51 63 32 3 -116 0 0 65 16 38 11 27 16 29 215 -7 65 37 46 64 55 40 66 56 26 63 40 4 -115 0 0 65 24 13 11 27 12 29 216 -7 65 45 18 65 3 17 67 3 47 63 47 52 -114 0 0 65 31 34 11 27 9 29 217 -7 65 52 36 65 10 41 67 10 54 63 55 25 -113 0 0 65 38 41 11 27 5 28 218 -6 65 59 40 65 17 50 67 17 48 64 2 44 -112 0 0 65 45 34 11 27 1 28 219 -6 66 6 31 65 24 46 67 24 28 64 9 49 -111 0 0 65 52 14 11 26 58 28 220 -5 66 13 8 65 31 29 67 30 55 64 16 40 -110 0 0 65 58 40 11 26 54 27 221 -5 66 19 32 65 37 57 67 37 9 64 23 18 -109 0 0 66 4 53 11 26 51 27 222 -5 66 25 42 65 44 13 67 43 9 64 29 42 -108 0 0 66 10 53 11 26 48 27 223 -4 66 31 39 65 50 15 67 48 57 64 35 52 -107 0 0 66 16 39 11 26 44 26 224 -4 66 37 23 65 56 4 67 54 32 64 41 49 -106 0 0 66 22 13 11 26 41 26 225 -3 66 42 54 66 1 39 67 59 54 64 47 33 -105 0 0 66 27 33 11 26 38 25 226 -3 66 48 12 66 7 2 68 5 3 64 53 3 -104 0 0 66 32 40 11 26 35 25 227 -3 66 53 18 66 12 12 68 10 0 64 58 21 -103 0 0 66 37 35 11 26 32 25 228 -2 66 58 10 66 17 8 68 14 44 65 3 25 -102 0 0 66 42 17 11 26 29 24 229 -2 67 2 50 66 21 52 68 19 16 65 8 16 -101 0 0 66 46 46 11 26 26 24 230 -1 67 7 17 66 26 23 68 23 35 65 12 53 -100 0 0 66 51 2 11 26 23 24 231 -1 67 11 32 66 30 41 68 27 43 65 17 18 - 99 0 0 66 55 6 11 26 20 23 232 -1 67 15 34 66 34 47 68 31 38 65 21 31 - 98 0 0 66 58 58 11 26 17 23 233 0 67 19 23 66 38 40 68 35 21 65 25 30 Uncertainty in time = +/- 10 secs Prediction of 2012 Jul 3.0 Data for the target star ------------------------ * name: 2UCAC 34575922 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 42 46.1083 DE: +08 07 14.253 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .032, .074 ) * V mag [mag]: 12.2 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 10.8652573956 DE(deg): 8.1932193972 * Equation of equinoxes (radians) : 0.000068740451405 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (142) Polana approx. diameter [km]: 50 approx. diameter ["]: .040 distance from Earth [AU]: 1.72400 * orbital information: orbit source: Preston date of fit: 2012 Jul 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1553 number of rejected observations: 92 time covered by the observations: 1903 Sep 23 - 2011 Aug 22 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.014, 67° remarks: * orbital elements for (142) Polana : Mean anomaly = 128.09752642 deg Arg. of pericenter = 291.61858395 deg Long. of node = 291.31857910 deg Inclination = 2.23764145 deg Eccentricity = 0.13610224 Semimajor axis = 2.41750982 AU Perihelion dist = 2.08848131 AU Mag: H = 10.12, G = 0.15 Epoch of elements : MJD 56175.48500000 TDT (2012 Sep 05.485) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 5 142 Polana 11h 32.6m UT 12.2 0 42 46.108 8 7 14.252UCAC 34575922 0.0 14.3 50 5.5 1.724 -1.690 -8.12 -147.4387 8.124 6.49 6.56 11.5435 -0.22811 0.70220 -4.91506 -1.59065 -0.00247 -0.00135 2000 126.6592962012 831.00000291.618584291.318579 2.2376410.13610224 2.4175098 2.088481310.3 5.00.15 RATE 2.6221150 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.076 0.039 359 2.83 0.073 0 0 3 3 056111.0020120905_575922 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 20, 04:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org