IOTA/IOTA-ES occultation update for (1057) Wanda / UCAC4 338-150100 event on 2023 May 30, 09:32 UT Visible from USA Summary ------- On 2023 May 30 UT, the 43.7 km diameter asteroid (1057) Wanda will occult a 14.4 mag star in the constellation Sagittarius for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.43 mag to 15.49 mag (the magnitude of the asteroid) for at most 5.060 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 77 * date and approx. time of event: 2023 May 30, 09:26 - 2023 May 30, 09:38 * geocentric midpoint of event [JD]: 2460094.89726854 * magnitude of target star: 14.40 * magnitude drop [mag]: 1.43 * estimated maximum duration [s]: 5.060 * Moon: 76 % sunlit, 87° distance * Sun: 152° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 96 * 1 sigma uncertainty interval [path widths]: +/- 0.72 * 1 sigma uncertainty interval [seconds]: +/- 7.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.043, +/- 0.021) * 1 sigma uncertainty ellipse (major, minor, PA): (0.044", 0.021", 84°) * approx speed of asteroid's shadow [km/s]: 8.6443 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 338-150100 by 1057 Wanda on 2023 May 30 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 -162 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 58 16 35 .... -161 0 0 59 17 2 9 37 36.9 0 138 -8 .. .. .. 58 37 37 .. .. .. 57 43 4 .... -160 0 0 58 42 36 9 37 36.7 1 139 -9 59 22 51 58 3 41 .. .. .. 57 9 48 -0.67 -159 0 0 58 8 26 9 37 36.3 2 140 -9 58 48 8 57 30 2 59 47 49 56 36 47 -1.31 -158 0 0 57 34 36 9 37 35.6 2 141 -10 58 13 45 56 56 41 59 12 33 56 4 5 -1.54 -157 0 0 57 1 6 9 37 34.5 3 142 -11 57 39 44 56 23 40 58 37 40 55 31 41 -1.66 -156 0 0 56 27 58 9 37 33.2 4 142 -11 57 6 4 55 51 0 58 3 10 54 59 38 -1.73 -155 0 0 55 55 12 9 37 31.6 5 143 -12 56 32 49 55 18 42 57 29 6 54 27 55 -1.78 -154 0 0 55 22 50 9 37 29.7 5 144 -13 55 59 58 54 46 47 56 55 28 53 56 35 -1.81 -153 0 0 54 50 54 9 37 27.4 6 145 -13 55 27 33 54 15 16 56 22 17 53 25 39 -1.84 -152 0 0 54 19 23 9 37 24.9 7 146 -14 54 55 35 53 44 11 55 49 35 52 55 7 -1.86 -151 0 0 53 48 19 9 37 22.1 8 147 -14 54 24 4 53 13 32 55 17 22 52 25 0 -1.87 -150 0 0 53 17 44 9 37 19.0 9 147 -15 53 53 2 52 43 20 54 45 38 51 55 20 -1.89 -149 0 0 52 47 37 9 37 15.6 9 148 -16 53 22 30 52 13 36 54 14 26 51 26 6 -1.90 -148 0 0 52 17 59 9 37 12.0 10 149 -16 52 52 28 51 44 21 53 43 46 50 57 21 -1.91 -147 0 0 51 48 52 9 37 8.1 11 150 -17 52 22 58 51 15 36 53 13 38 50 29 4 -1.92 -146 0 0 51 20 15 9 37 3.9 11 151 -17 51 53 58 50 47 20 52 44 2 50 1 17 -1.92 -145 0 0 50 52 10 9 36 59.4 12 152 -18 51 25 31 50 19 35 52 15 1 49 33 59 -1.93 -144 0 0 50 24 37 9 36 54.7 13 152 -18 50 57 36 49 52 22 51 46 33 49 7 12 -1.93 -143 0 0 49 57 36 9 36 49.7 14 153 -18 50 30 15 49 25 41 51 18 39 48 40 56 -1.94 -142 0 0 49 31 8 9 36 44.5 14 154 -19 50 3 28 48 59 32 50 51 21 48 15 12 -1.94 -141 0 0 49 5 14 9 36 39.0 15 155 -19 49 37 15 48 33 55 50 24 38 47 49 59 -1.94 -140 0 0 48 39 54 9 36 33.3 16 156 -20 49 11 36 48 8 52 49 58 30 47 25 19 -1.95 -139 0 0 48 15 8 9 36 27.4 16 157 -20 48 46 32 47 44 23 49 32 59 47 1 12 -1.95 -138 0 0 47 50 57 9 36 21.2 17 157 -20 48 22 4 47 20 28 49 8 4 46 37 39 -1.95 -137 0 0 47 27 20 9 36 14.8 17 158 -21 47 58 11 46 57 7 48 43 45 46 14 39 -1.95 -136 0 0 47 4 19 9 36 8.3 18 159 -21 47 34 54 46 34 21 48 20 4 45 52 13 -1.95 -135 0 0 46 41 54 9 36 1.5 19 160 -21 47 12 14 46 12 10 47 56 59 45 30 21 -1.96 -134 0 0 46 20 4 9 35 54.5 19 161 -21 46 50 9 45 50 34 47 34 32 45 9 4 -1.96 -133 0 0 45 58 51 9 35 47.3 20 162 -22 46 28 42 45 29 34 47 12 43 44 48 21 -1.96 -132 0 0 45 38 13 9 35 40.0 20 163 -22 46 7 51 45 9 9 46 51 31 44 28 14 -1.96 -131 0 0 45 18 13 9 35 32.5 21 164 -22 45 47 37 44 49 21 46 30 57 44 8 42 -1.96 -130 0 0 44 58 48 9 35 24.8 21 165 -22 45 28 0 44 30 8 46 11 1 43 49 46 -1.96 -129 0 0 44 40 1 9 35 17.0 22 165 -22 45 9 1 44 11 32 45 51 43 43 31 25 -1.96 -128 0 0 44 21 51 9 35 9.0 22 166 -22 44 50 39 43 53 33 45 33 4 43 13 40 -1.96 -127 0 0 44 4 18 9 35 0.8 23 167 -22 44 32 55 43 36 10 45 15 3 42 56 31 -1.96 -126 0 0 43 47 22 9 34 52.6 23 168 -22 44 15 49 43 19 24 44 57 41 42 39 59 -1.96 -125 0 0 43 31 3 9 34 44.2 23 169 -23 43 59 21 43 3 15 44 40 57 42 24 2 -1.96 -124 0 0 43 15 22 9 34 35.7 24 170 -23 43 43 30 42 47 43 44 24 52 42 8 42 -1.96 -123 0 0 43 0 18 9 34 27.0 24 171 -22 43 28 17 42 32 48 44 9 25 41 53 59 -1.96 -122 0 0 42 45 53 9 34 18.3 25 172 -22 43 13 43 42 18 30 43 54 37 41 39 52 -1.96 -121 0 0 42 32 4 9 34 9.5 25 173 -22 42 59 46 42 4 50 43 40 29 41 26 22 -1.96 -120 0 0 42 18 54 9 34 0.5 25 174 -22 42 46 28 41 51 47 43 26 59 41 13 29 -1.96 -119 0 0 42 6 22 9 33 51.5 25 175 -22 42 33 49 41 39 21 43 14 8 41 1 13 -1.96 -118 0 0 41 54 27 9 33 42.4 26 176 -22 42 21 48 41 27 33 43 1 56 40 49 34 -1.96 -117 0 0 41 43 11 9 33 33.2 26 177 -22 42 10 25 41 16 23 42 50 24 40 38 33 -1.96 -116 0 0 41 32 33 9 33 24.0 26 178 -22 41 59 40 41 5 51 42 39 30 40 28 8 -1.96 -115 0 0 41 22 32 9 33 14.7 26 179 -22 41 49 34 40 55 56 42 29 16 40 18 20 -1.96 -114 0 0 41 13 10 9 33 5.4 26 180 -21 41 40 7 40 46 39 42 19 40 40 9 10 -1.96 -113 0 0 41 4 26 9 32 56.0 27 181 -21 41 31 18 40 37 59 42 10 44 40 0 37 -1.96 -112 0 0 40 56 21 9 32 46.6 27 182 -21 41 23 8 40 29 58 42 2 27 39 52 41 -1.96 -111 0 0 40 48 53 9 32 37.2 27 183 -21 41 15 37 40 22 34 41 54 50 39 45 23 -1.96 -110 0 0 40 42 4 9 32 27.7 27 184 -20 41 8 44 40 15 49 41 47 51 39 38 42 -1.96 -109 0 0 40 35 54 9 32 18.2 27 185 -20 41 2 30 40 9 41 41 41 32 39 32 39 -1.96 -108 0 0 40 30 21 9 32 8.8 27 186 -20 40 56 55 40 4 12 41 35 52 39 27 13 -1.97 -107 0 0 40 25 27 9 31 59.3 27 187 -19 40 51 58 39 59 20 41 30 52 39 22 25 -1.97 -106 0 0 40 21 12 9 31 49.8 27 188 -19 40 47 40 39 55 7 41 26 30 39 18 15 -1.97 -105 0 0 40 17 35 9 31 40.3 27 189 -18 40 44 2 39 51 32 41 22 49 39 14 42 -1.97 -104 0 0 40 14 36 9 31 30.9 27 190 -18 40 41 2 39 48 35 41 19 47 39 11 47 -1.97 -103 0 0 40 12 16 9 31 21.5 27 191 -18 40 38 41 39 46 16 41 17 24 39 9 30 -1.97 -102 0 0 40 10 35 9 31 12.1 27 192 -17 40 36 58 39 44 35 41 15 41 39 7 50 -1.97 -101 0 0 40 9 32 9 31 2.8 26 193 -17 40 35 55 39 43 33 41 14 37 39 6 48 -1.97 -100 0 0 40 9 8 9 30 53.5 26 194 -16 40 35 31 39 43 8 41 14 12 39 6 24 -1.97 - 99 0 0 40 9 22 9 30 44.3 26 195 -16 40 35 46 39 43 23 41 14 28 39 6 37 -1.97 - 98 0 0 40 10 15 9 30 35.1 26 196 -15 40 36 39 39 44 15 41 15 22 39 7 29 -1.97 - 97 0 0 40 11 47 9 30 26.0 26 197 -15 40 38 12 39 45 46 41 16 57 39 8 58 -1.97 - 96 0 0 40 13 57 9 30 16.9 25 198 -14 40 40 24 39 47 55 41 19 11 39 11 6 -1.98 - 95 0 0 40 16 47 9 30 8.0 25 199 -14 40 43 15 39 50 42 41 22 4 39 13 51 -1.98 - 94 0 0 40 20 15 9 29 59.1 25 199 -13 40 46 45 39 54 8 41 25 37 39 17 14 -1.98 - 93 0 0 40 24 21 9 29 50.4 25 200 -12 40 50 54 39 58 12 41 29 51 39 21 15 -1.98 - 92 0 0 40 29 7 9 29 41.7 24 201 -12 40 55 42 40 2 55 41 34 43 39 25 54 -1.98 - 91 0 0 40 34 31 9 29 33.2 24 202 -11 41 1 10 40 8 16 41 40 16 39 31 11 -1.98 - 90 0 0 40 40 34 9 29 24.7 23 203 -11 41 7 17 40 14 16 41 46 28 39 37 6 -1.98 - 89 0 0 40 47 16 9 29 16.4 23 204 -10 41 14 3 40 20 54 41 53 20 39 43 39 -1.99 - 88 0 0 40 54 37 9 29 8.2 23 205 -9 41 21 28 40 28 11 42 0 52 39 50 50 -1.99 - 87 0 0 41 2 37 9 29 0.1 22 206 -9 41 29 33 40 36 7 42 9 4 39 58 39 -1.99 - 86 0 0 41 11 16 9 28 52.2 22 207 -8 41 38 17 40 44 41 42 17 56 40 7 7 -1.99 - 85 0 0 41 20 34 9 28 44.5 21 208 -7 41 47 40 40 53 53 42 27 28 40 16 12 -1.99 - 84 0 0 41 30 31 9 28 36.8 21 208 -7 41 57 43 41 3 44 42 37 40 40 25 55 -2.00 - 83 0 0 41 41 7 9 28 29.4 20 209 -6 42 8 25 41 14 14 42 48 32 40 36 17 -2.00 - 82 0 0 41 52 21 9 28 22.1 20 210 -5 42 19 47 41 25 22 43 0 4 40 47 16 -2.00 - 81 0 0 42 4 15 9 28 15.0 19 211 -5 42 31 48 41 37 9 43 12 16 40 58 54 -2.00 - 80 0 0 42 16 48 9 28 8.1 19 212 -4 42 44 28 41 49 35 43 25 8 41 11 9 -2.00 - 79 0 0 42 29 59 9 28 1.3 18 213 -3 42 57 48 42 2 38 43 38 40 41 24 3 -2.01 - 78 0 0 42 43 50 9 27 54.8 18 213 -2 43 11 47 42 16 21 43 52 52 41 37 34 -2.01 - 77 0 0 42 58 19 9 27 48.4 17 214 -2 43 26 25 42 30 42 44 7 44 41 51 43 -2.01 - 76 0 0 43 13 28 9 27 42.3 16 215 -1 43 41 43 42 45 41 44 23 17 42 6 30 -2.01 - 75 0 0 43 29 15 9 27 36.3 16 216 0 43 57 40 43 1 19 44 39 29 42 21 55 -2.02 - 74 0 0 43 45 40 9 27 30.6 15 217 1 44 14 16 43 17 35 44 56 21 42 37 58 -2.02 - 73 0 0 44 2 45 9 27 25.1 14 217 1 44 31 32 43 34 29 45 13 53 42 54 38 -2.02 - 72 0 0 44 20 28 9 27 19.9 14 218 2 44 49 26 43 52 1 45 32 5 43 11 55 -2.03 - 71 0 0 44 38 50 9 27 14.8 13 219 3 45 8 0 44 10 11 45 50 57 43 29 51 -2.03 - 70 0 0 44 57 50 9 27 10.1 12 220 4 45 27 12 44 28 59 46 10 29 43 48 23 -2.03 - 69 0 0 45 17 28 9 27 5.5 12 220 4 45 47 3 44 48 25 46 30 40 44 7 32 -2.04 - 68 0 0 45 37 44 9 27 1.2 11 221 5 46 7 34 45 8 29 46 51 31 44 27 18 -2.04 - 67 0 0 45 58 39 9 26 57.2 10 222 6 46 28 42 45 29 10 47 13 2 44 47 41 -2.05 - 66 0 0 46 20 11 9 26 53.5 10 223 7 46 50 29 45 50 28 47 35 11 45 8 41 -2.05 - 65 0 0 46 42 21 9 26 50.0 9 223 7 47 12 54 46 12 23 47 58 0 45 30 17 -2.06 - 64 0 0 47 5 8 9 26 46.7 8 224 8 47 35 57 46 34 56 48 21 28 45 52 29 -2.06 - 63 0 0 47 28 32 9 26 43.8 7 225 9 47 59 38 46 58 4 48 45 34 46 15 16 -2.07 - 62 0 0 47 52 33 9 26 41.1 7 226 10 48 23 56 47 21 49 49 10 19 46 38 40 -2.08 - 61 0 0 48 17 10 9 26 38.8 6 226 10 48 48 51 47 46 10 49 35 43 47 2 38 -2.09 - 60 0 0 48 42 24 9 26 36.7 5 227 11 49 14 23 48 11 6 50 1 43 47 27 11 -2.10 - 59 0 0 49 8 13 9 26 34.9 4 228 12 49 40 32 48 36 37 50 28 22 47 52 18 -2.12 - 58 0 0 49 34 38 9 26 33.4 4 229 13 50 7 16 49 2 43 50 55 38 48 17 59 -2.14 - 57 0 0 50 1 37 9 26 32.2 3 229 13 50 34 36 49 29 23 51 23 30 48 44 14 -2.18 - 56 0 0 50 29 11 9 26 31.4 2 230 14 51 2 32 49 56 37 51 51 59 49 11 1 -2.24 - 55 0 0 50 57 19 9 26 30.8 1 231 15 51 31 1 50 24 25 52 21 4 49 38 21 -2.39 - 54 0 0 51 26 0 9 26 30.5 0 232 16 52 0 5 50 52 44 .. .. .. 50 6 13 -3.14 - 53 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 50 34 36 .... Uncertainty in time = +/- 7 secs Prediction of 2023 May 12.0 Data for the target star ------------------------ * name: UCAC4 338-150100 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 26 51.3776 DE: -22 28 40.401 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 26 51.3776 DE: -22 28 40.401 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 14.4 * B mag [mag]: 15.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1057) Wanda asteroid class: approx. diameter [km]: 44 approx. diameter ["]: 0.031 distance from Earth [AU]: 1.97670 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.044", 0.021", 84.2° remarks: * orbital elements for (1057)Wanda : Mean anomaly = 282.6175395870 deg Arg. of pericenter = 114.8826091002 deg Long. of node = 257.8411701458 deg Inclination = 3.5418018055 deg Eccentricity = 0.2475408541 Semimajor axis = 2.8924567814 AU Perihelion dist = 2.1764555593 AU Mag: H = 11.05, G = 0.15 Epoch of elements : MJD 60094.39727341 TDT (2023 May 30.3973) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,5.06,2023,5,30,9.534445,0.080821,0.886027,-4.858922,0.442943,-0.002579,-0.000198,0.000001,0.000000 -113.5886,-22.4642,36.37,21.76,False UCAC4 338-150100,18.44760487,-22.4778892,15.25,14.40,13.94,0.0,0,,18.47133092,-22.4642322,1.43,1.44,0,0,0 1057,Wanda,15.49,43.7,1.9767,0,0,-1.560,1.97,,2.2,0 0,282.5379,2023,5,30,114.8826,257.8412,3.5418,0.24754,2.89246,2.17646,11.07,5.0,0.15 1.719,0.0437,0.0207,84,0.0219,Known errors,0.84,-1,-1,-1 20230530_150100,60075.98 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 11, 23:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org