IOTA/IOTA-ES occultation update for (737) Arequipa / TYC 0055-00741-1 event on 2012 Dec 25, 11:50 UT Visible from Japan, Russia Summary ------- On 2012 Dec 25 UT, the 45 km diameter asteroid (737) Arequipa will occult a 9.8 mag star in the constellation Cetus for observers along a path across Japan, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 13.1 mag (the magnitude of the asteroid) for at most 16.4 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 61 * date and approx. time of event: 2012 Dec 25, 11:19 - 2012 Dec 25, 12:22 UT * geocentric midpoint of event [JD]: 2456286.99362083 * magnitude of target star: 9.8 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 16.4 * Moon: 93 % sunlit, 23° distance * Sun: 128° distance * rough path description: Japan, Russia The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 1.01 * 1 sigma uncertainty interval [seconds]: +/- 15.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .030", 87° ) * approx speed of asteroid's shadow [km/s]: 2.7633 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0055-00741-1 by 737 Arequipa on 2012 Dec 25 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude -139 50 30 -19 12 49 11 19 16 10 276 -38 -140 31 37 -19 18 59 -139 6 30 -19 6 46 -141 47 49 -19 31 44 -137 25 36 -18 55 3 -144 55 53 -17 59 57 11 20 4 15 277 -42 -145 25 4 -18 6 32 -144 25 46 -17 53 24 -146 21 27 -18 19 58 -143 21 38 -17 40 20 -148 42 17 -16 50 33 11 20 53 18 278 -45 -149 6 38 -16 57 18 -148 17 24 -16 43 51 -149 54 21 -17 10 59 -147 25 24 -16 30 22 -151 49 41 -15 43 3 11 21 41 21 279 -47 -152 11 19 -15 49 52 -151 27 43 -15 36 16 -152 53 59 -16 3 41 -150 42 9 -15 22 36 -154 32 37 -14 36 51 11 22 30 24 279 -49 -154 52 27 -14 43 42 -154 12 31 -14 30 1 -155 31 46 -14 57 35 -153 31 3 -14 16 16 -156 58 18 -13 31 38 11 23 18 26 279 -51 -157 16 52 -13 38 31 -156 39 31 -13 24 47 -157 53 45 -13 52 26 -156 0 54 -13 10 58 -159 10 58 -12 27 13 11 24 7 28 279 -52 -159 28 35 -12 34 6 -158 53 11 -12 20 21 -160 3 39 -12 48 2 -158 16 41 -12 6 31 -161 13 25 -11 23 28 11 24 56 30 279 -54 -161 30 17 -11 30 21 -160 56 23 -11 16 36 -162 3 55 -11 44 18 -160 21 32 -11 2 44 -163 7 30 -10 20 17 11 25 44 32 279 -55 -163 23 47 -10 27 10 -162 51 6 -10 13 25 -163 56 15 -10 41 7 -162 17 33 - 9 59 33 -164 54 39 - 9 17 36 11 26 33 33 279 -57 -165 10 26 - 9 24 29 -164 38 45 - 9 10 43 -165 41 58 - 9 38 25 -164 6 16 - 8 56 51 -166 35 54 - 8 15 20 11 27 21 35 279 -58 -166 51 16 - 8 22 13 -166 20 25 - 8 8 27 -167 22 0 - 8 36 9 -165 48 49 - 7 54 35 -168 12 4 - 7 13 26 11 28 10 37 278 -59 -168 27 6 - 7 20 19 -167 56 56 - 7 6 34 -168 57 9 - 7 34 15 -167 26 5 - 6 52 41 -169 43 48 - 6 11 53 11 28 58 38 278 -60 -169 58 32 - 6 18 46 -169 28 58 - 6 5 0 -170 28 1 - 6 32 41 -168 58 44 - 5 51 8 -171 11 37 - 5 10 37 11 29 47 39 277 -61 -171 26 6 - 5 17 30 -170 57 4 - 5 3 44 -171 55 6 - 5 31 25 -170 27 22 - 4 49 52 -172 35 59 - 4 9 36 11 30 35 41 276 -62 -172 50 15 - 4 16 29 -172 21 39 - 4 2 43 -173 18 49 - 4 30 24 -171 52 25 - 3 48 51 -173 57 15 - 3 8 49 11 31 24 42 276 -63 -174 11 19 - 3 15 42 -173 43 6 - 3 1 56 -174 39 31 - 3 29 37 -173 14 17 - 2 48 3 -175 15 43 - 2 8 13 11 32 12 43 275 -64 -175 29 38 - 2 15 6 -175 1 44 - 2 1 20 -175 57 30 - 2 29 1 -174 33 16 - 1 47 27 -176 31 40 - 1 7 47 11 33 1 44 274 -65 -176 45 26 - 1 14 40 -176 17 50 - 1 0 54 -177 13 2 - 1 28 36 -175 49 40 - 0 47 0 -177 45 19 - 0 7 29 11 33 49 45 273 -66 -177 58 58 - 0 14 23 -177 31 37 - 0 0 36 -178 26 19 - 0 28 19 -177 3 43 0 13 18 -178 56 53 0 52 41 11 34 38 46 272 -67 -179 10 25 0 45 48 -178 43 17 0 59 35 -179 37 33 0 31 51 -178 15 37 1 13 30 179 53 28 1 52 47 11 35 27 47 271 -68 179 40 2 1 45 53 -179 53 2 1 59 41 179 13 4 1 31 55 -179 25 34 2 13 37 178 45 34 2 52 48 11 36 15 48 270 -68 178 32 13 2 45 53 178 58 59 2 59 43 178 5 25 2 31 55 179 26 17 3 13 40 177 39 18 3 52 47 11 37 4 49 269 -69 177 26 0 3 45 52 177 52 38 3 59 43 176 59 21 3 31 52 178 19 47 4 13 41 176 34 30 4 52 45 11 37 52 50 268 -70 176 21 17 4 45 48 176 47 47 4 59 41 175 54 44 4 31 47 177 14 49 5 13 41 175 31 6 5 52 42 11 38 41 51 266 -70 175 17 55 5 45 45 175 44 20 5 59 39 174 51 28 5 31 42 176 11 15 6 13 41 174 28 58 6 52 41 11 39 29 52 265 -71 174 15 49 6 45 42 174 42 9 6 59 38 173 49 27 6 31 38 175 8 59 7 13 43 173 28 0 7 52 42 11 40 18 52 263 -71 173 14 54 7 45 42 173 41 10 7 59 41 172 48 36 7 31 36 174 7 56 8 13 47 172 28 9 8 52 46 11 41 6 53 262 -71 172 15 4 8 45 46 172 41 17 8 59 46 171 48 48 8 31 37 173 8 0 9 13 55 171 29 18 9 52 56 11 41 55 54 260 -72 171 16 14 9 45 54 171 42 26 9 59 57 170 50 0 9 31 43 172 9 7 10 14 9 170 31 24 10 53 12 11 42 43 54 259 -72 170 18 21 10 46 9 170 44 31 11 0 15 169 52 8 10 31 54 171 11 11 11 14 29 169 34 23 11 53 35 11 43 32 55 257 -72 169 21 20 11 46 30 169 47 30 12 0 39 168 55 7 11 32 13 170 14 10 12 14 57 168 38 11 12 54 7 11 44 21 55 255 -72 168 25 7 12 47 1 168 51 18 13 1 13 167 58 53 12 32 40 169 17 58 13 15 34 167 42 44 13 54 49 11 45 9 55 253 -72 167 29 39 13 47 41 167 55 52 14 1 57 167 3 24 13 33 16 168 22 34 14 16 21 166 47 59 14 55 42 11 45 58 56 251 -72 166 34 53 14 48 32 167 1 8 15 2 52 166 8 35 14 34 4 167 27 52 15 17 21 165 53 52 15 56 48 11 46 46 56 249 -72 165 40 45 15 49 36 166 7 3 16 4 0 165 14 24 15 35 4 166 33 51 16 18 33 165 0 22 16 58 8 11 47 35 56 247 -72 164 47 12 16 50 54 165 13 34 17 5 22 164 20 48 16 36 17 165 40 26 17 20 0 164 7 24 17 59 43 11 48 23 57 245 -71 163 54 13 17 52 27 164 20 39 18 7 0 163 27 44 17 37 45 164 47 36 18 21 42 163 14 57 19 1 36 11 49 12 57 243 -71 163 1 43 18 54 16 163 28 15 19 8 55 162 35 9 18 39 30 163 55 17 19 23 43 162 22 58 20 3 46 11 50 0 57 241 -71 162 9 40 19 56 24 162 36 19 20 11 8 161 43 0 19 41 32 163 3 28 20 26 2 161 31 23 21 6 17 11 50 49 57 239 -70 161 18 2 20 58 52 161 44 48 21 13 42 160 51 15 20 43 54 162 12 4 21 28 42 160 40 12 22 9 10 11 51 37 57 237 -70 160 26 47 22 1 42 160 53 40 22 16 38 159 59 52 21 46 38 161 21 5 22 31 44 159 49 21 23 12 26 11 52 26 57 235 -70 159 35 51 23 4 54 160 2 54 23 19 57 159 8 47 22 49 44 160 30 27 23 35 10 158 58 47 24 16 7 11 53 14 56 233 -69 158 45 13 24 8 32 159 12 25 24 23 42 158 18 0 23 53 14 159 40 9 24 39 2 158 8 29 25 20 15 11 54 3 56 231 -69 157 54 50 25 12 36 158 22 12 25 27 54 157 27 26 24 57 11 158 50 7 25 43 21 157 18 25 26 24 52 11 54 52 56 229 -68 157 4 39 26 17 10 157 32 14 26 32 35 156 37 5 26 1 37 158 0 20 26 48 11 156 28 31 27 30 1 11 55 40 56 227 -67 156 14 39 27 22 14 156 42 26 27 37 48 155 46 52 27 6 33 157 10 46 27 53 33 155 38 45 28 35 43 11 56 29 55 225 -67 155 24 47 28 27 52 155 52 48 28 43 35 154 56 47 28 12 1 156 21 22 28 59 29 154 49 6 29 42 2 11 57 17 55 223 -66 154 35 1 29 34 6 155 3 16 29 49 58 154 6 46 29 18 5 155 32 5 30 6 2 153 59 30 30 48 58 11 58 6 54 221 -65 153 45 17 30 40 57 154 13 48 30 57 0 153 16 47 30 24 46 154 42 54 31 13 15 153 9 55 31 56 37 11 58 54 54 219 -64 152 55 33 31 48 30 153 24 21 32 4 44 152 26 47 31 32 8 153 53 45 32 21 10 152 20 18 33 4 59 11 59 43 53 217 -64 152 5 48 32 56 46 152 34 54 33 13 12 151 36 43 32 40 13 153 4 37 33 29 50 151 30 37 34 14 9 12 0 31 53 215 -63 151 15 56 34 5 50 151 45 22 34 22 29 150 46 32 33 49 4 152 15 26 34 39 20 150 40 48 35 24 10 12 1 20 52 214 -62 150 25 57 35 15 44 150 55 44 35 32 36 149 56 12 34 58 45 151 26 11 35 49 41 149 50 48 36 35 6 12 2 8 51 212 -61 149 35 45 36 26 33 150 5 56 36 43 40 149 5 38 36 9 19 150 36 46 37 0 59 149 0 34 37 47 1 12 2 57 51 210 -60 148 45 19 37 38 20 149 15 54 37 55 42 148 14 48 37 20 51 149 47 11 38 13 18 148 10 1 38 59 59 12 3 45 50 209 -59 147 54 33 38 51 10 148 25 35 39 8 49 147 23 36 38 33 24 148 57 20 39 26 42 147 19 7 40 14 7 12 4 34 49 207 -58 147 3 24 40 5 9 147 34 55 40 23 6 146 31 59 39 47 5 148 7 10 40 41 17 146 27 45 41 29 28 12 5 23 48 205 -58 146 11 47 41 20 20 146 43 49 41 38 37 145 39 52 41 1 57 147 16 38 41 57 8 145 35 51 42 46 10 12 6 11 47 204 -57 145 19 37 42 36 52 145 52 13 42 55 29 144 47 9 42 18 8 146 25 37 43 14 22 144 43 19 44 4 19 12 7 0 46 202 -56 144 26 47 43 54 50 144 59 59 44 13 50 143 53 44 43 35 43 145 34 3 44 33 7 143 50 3 45 24 4 12 7 48 45 201 -55 143 33 10 45 14 22 144 7 3 45 33 48 142 59 29 44 54 51 144 41 49 45 53 30 142 55 54 46 45 33 12 8 37 44 200 -53 142 38 40 46 35 38 143 13 16 46 55 30 142 4 17 46 15 39 143 48 48 47 15 41 142 0 43 48 8 57 12 9 25 43 198 -52 141 43 6 47 58 46 142 18 30 48 19 9 141 7 57 47 38 18 142 54 53 48 39 51 141 4 20 49 34 27 12 10 14 42 197 -51 140 46 17 49 23 59 141 22 34 49 44 56 140 10 18 49 2 58 141 59 53 50 6 12 140 6 32 51 2 16 12 11 2 40 196 -50 139 48 1 50 51 31 140 25 15 51 13 4 139 11 7 50 29 53 141 3 36 51 34 58 139 7 3 52 32 42 12 11 51 39 194 -49 138 48 0 52 21 36 139 26 18 52 43 50 138 10 6 51 59 18 140 5 49 53 6 27 138 5 33 54 6 3 12 12 39 38 193 -48 137 45 55 53 54 34 138 25 25 54 17 34 137 6 54 53 31 30 139 6 13 54 41 0 137 1 38 55 42 41 12 13 28 36 192 -46 136 41 21 55 30 46 137 22 10 55 54 39 136 1 6 55 6 51 138 4 25 56 19 0 135 54 45 57 23 6 12 14 17 34 190 -45 135 33 44 57 10 41 136 16 2 57 35 35 134 52 5 56 45 46 136 59 57 58 0 58 134 44 11 59 7 51 12 15 5 33 189 -44 134 22 20 58 54 51 135 6 21 59 20 55 133 39 9 58 28 49 135 52 8 59 47 33 133 28 58 60 57 42 12 15 54 31 187 -42 133 6 11 60 44 1 133 52 8 61 11 28 132 21 14 60 16 38 134 40 5 61 39 32 132 7 43 62 53 35 12 16 42 29 186 -41 131 43 51 62 39 5 132 32 1 63 8 11 130 56 54 62 10 6 133 22 31 63 38 1 130 38 20 64 56 49 12 17 31 27 184 -39 130 13 14 64 41 18 131 3 58 65 12 27 129 24 2 64 10 22 131 57 28 65 44 26 128 57 33 67 9 11 12 18 19 25 183 -38 128 31 1 66 52 24 129 24 43 67 26 7 127 39 18 66 19 1 130 21 46 68 0 53 126 59 40 69 33 22 12 19 8 23 181 -36 126 31 34 69 14 55 127 28 36 69 52 2 125 37 9 68 38 19 128 29 51 70 30 31 124 33 47 72 13 35 12 19 56 20 178 -34 124 4 8 71 52 48 125 4 32 72 34 43 123 7 17 71 11 47 126 10 28 73 18 31 121 14 44 75 17 21 12 20 45 17 175 -31 120 44 36 74 52 58 121 46 21 75 42 19 119 47 34 74 5 18 122 55 31 76 34 40 115 43 32 79 0 34 12 21 33 13 170 -29 115 20 40 78 29 38 116 7 24 79 32 44 114 37 6 77 30 22 116 59 24 80 42 10 98 48 10 84 11 41 12 22 22 7 153 -25 100 43 58 83 22 58 95 37 58 85 5 28 102 52 54 81 55 44 74 58 25 87 15 36 Uncertainty in time = +/- 17 secs Prediction of 2012 Dec 17.0 Data for the target star ------------------------ * name: TYC 0055-00741-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 01 27.1269 DE: +02 08 00.061 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .028 ) * V mag [mag]: 9.8 * B mag [mag]: 10.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (737) Arequipa approx. diameter [km]: 45 approx. diameter ["]: .034 distance from Earth [AU]: 1.85100 * orbital information: orbit source: Preston date of fit: 2012 Dec 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1054 number of rejected observations: 119 time covered by the observations: 1915 May 07 - 2012 Dec 12 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.011, 82° remarks: * orbital elements for (737) Arequipa : Mean anomaly = 74.71883805 deg Arg. of pericenter = 133.99749638 deg Long. of node = 184.90743299 deg Inclination = 12.35177803 deg Eccentricity = 0.24210426 Semimajor axis = 2.59341526 AU Perihelion dist = 1.96553838 AU Mag: H = 8.83, G = 0.15 Epoch of elements : MJD 56286.49300000 TDT (2012 Dec 25.493) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 25 737 Arequipa 11h 50.8m UT 9.8 3 1 27.127 2 8 0.06TYC 0055-00741-1 10.3 13.1 45 16.4 1.851 -0.292 5.97 133.2619 2.132 2.37 -23.37 11.8469 0.43940 0.32618 -0.92452 1.25613 0.00406 0.00219 2000 73.18654720121219.00000133.997496184.907433 12.3517780.24210426 2.5934153 1.9655384 8.8 5.00.15 RATE 2.3599120 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.030 87 2.01 0.034 0 0-1 1 056278.0020121225_0741-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Dec 16, 19:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org