IOTA/IOTA-ES occultation update for (103) Hera / UCAC4-360-196987 event on 2023 Mar 23, 13:45 UT Visible from W USA Summary ------- On 2023 Mar 23 UT, the 86 km diameter asteroid (103) Hera will occult a 12.5 mag star in the constellation Sagittarius for observers along a path across W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.03 mag to 12.99 mag (the magnitude of the asteroid) for at most 3.090 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: 100 * date and approx. time of event: 2023 Mar 23, 13:42 - 2023 Mar 23, 13:47 * geocentric midpoint of event [JD]: 2460027.07291021 * magnitude of target star: 12.49 * magnitude drop [mag]: 1.03 * estimated maximum duration [s]: 3.090 * Moon: 5 % sunlit, 96° distance * Sun: 72° distance * rough path description: W USA The occultation path -------------------- * approximate projected width [km]: 161 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 86°) * approx speed of asteroid's shadow [km/s]: 27.8234 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-360-196987 by 103 Hera on 2023 Mar 23 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 -165 0 0 45 51 58 13 42 57.3 0 116 -32 45 3 55 .. .. .. 45 0 37 .. .. .. .... -164 0 0 45 31 14 13 42 57.4 1 117 -32 44 43 24 46 20 17 44 40 7 46 23 45 -0.48 -163 0 0 45 10 52 13 42 57.5 2 118 -31 44 23 14 45 59 41 44 19 57 46 3 8 -1.03 -162 0 0 44 50 52 13 42 57.7 2 118 -31 44 3 26 45 39 28 44 0 9 45 42 54 -1.21 -161 0 0 44 31 13 13 42 58.0 3 119 -31 43 43 59 45 19 37 43 40 44 45 23 2 -1.31 -160 0 0 44 11 58 13 42 58.3 4 120 -30 43 24 55 45 0 9 43 21 40 45 3 34 -1.36 -159 0 0 43 53 6 13 42 58.7 5 121 -30 43 6 14 44 41 5 43 3 0 44 44 29 -1.40 -158 0 0 43 34 38 13 42 59.3 5 121 -29 42 47 57 44 22 25 42 44 44 44 25 48 -1.43 -157 0 0 43 16 34 13 42 59.9 6 122 -29 42 30 4 44 4 10 42 26 52 44 7 32 -1.45 -156 0 0 42 58 55 13 43 0.5 7 123 -28 42 12 36 43 46 20 42 9 24 43 49 41 -1.46 -155 0 0 42 41 42 13 43 1.3 8 123 -28 41 55 33 43 28 56 41 52 22 43 32 16 -1.47 -154 0 0 42 24 55 13 43 2.1 9 124 -28 41 38 55 43 11 58 41 35 45 43 15 17 -1.48 -153 0 0 42 8 34 13 43 3.1 9 125 -27 41 22 44 42 55 26 41 19 35 42 58 45 -1.49 -152 0 0 41 52 40 13 43 4.1 10 125 -26 41 6 59 42 39 22 41 3 50 42 42 40 -1.50 -151 0 0 41 37 12 13 43 5.1 11 126 -26 40 51 41 42 23 45 40 48 33 42 27 3 -1.51 -150 0 0 41 22 13 13 43 6.3 12 127 -25 40 36 51 42 8 36 40 33 43 42 11 53 -1.51 -149 0 0 41 7 42 13 43 7.5 12 128 -25 40 22 28 41 53 56 40 19 21 41 57 12 -1.52 -148 0 0 40 53 38 13 43 8.8 13 128 -24 40 8 33 41 39 44 40 5 26 41 42 59 -1.52 -147 0 0 40 40 4 13 43 10.2 14 129 -24 39 55 6 41 26 1 39 52 0 41 29 15 -1.53 -146 0 0 40 26 58 13 43 11.7 15 130 -23 39 42 9 41 12 47 39 39 3 41 16 1 -1.53 -145 0 0 40 14 22 13 43 13.2 15 131 -22 39 29 40 41 0 3 39 26 35 41 3 16 -1.53 -144 0 0 40 2 15 13 43 14.8 16 131 -22 39 17 40 40 47 49 39 14 36 40 51 2 -1.54 -143 0 0 39 50 39 13 43 16.5 17 132 -21 39 6 10 40 36 5 39 3 6 40 39 17 -1.54 -142 0 0 39 39 32 13 43 18.3 17 133 -20 38 55 10 40 24 51 38 52 7 40 28 3 -1.54 -141 0 0 39 28 56 13 43 20.1 18 134 -20 38 44 40 40 14 9 38 41 37 40 17 20 -1.55 -140 0 0 39 18 51 13 43 22.0 19 134 -19 38 34 41 40 3 57 38 31 38 40 7 8 -1.55 -139 0 0 39 9 16 13 43 23.9 19 135 -18 38 25 12 39 54 17 38 22 9 39 57 27 -1.55 -138 0 0 39 0 13 13 43 25.9 20 136 -18 38 16 14 39 45 8 38 13 11 39 48 18 -1.55 -137 0 0 38 51 41 13 43 28.0 21 137 -17 38 7 46 39 36 30 38 4 45 39 39 40 -1.55 -136 0 0 38 43 40 13 43 30.2 21 138 -16 37 59 50 39 28 25 37 56 49 39 31 34 -1.56 -135 0 0 38 36 11 13 43 32.4 22 138 -15 37 52 26 39 20 51 37 49 25 39 24 0 -1.56 -134 0 0 38 29 14 13 43 34.7 23 139 -15 37 45 33 39 13 50 37 42 32 39 16 59 -1.56 -133 0 0 38 22 49 13 43 37.0 23 140 -14 37 39 12 39 7 21 37 36 11 39 10 30 -1.56 -132 0 0 38 16 57 13 43 39.4 24 141 -13 37 33 22 39 1 25 37 30 22 39 4 33 -1.56 -131 0 0 38 11 36 13 43 41.8 24 142 -12 37 28 5 38 56 1 37 25 4 38 59 9 -1.56 -130 0 0 38 6 48 13 43 44.3 25 143 -12 37 23 19 38 51 10 37 20 19 38 54 18 -1.57 -129 0 0 38 2 32 13 43 46.9 25 144 -11 37 19 6 38 46 52 37 16 6 38 50 0 -1.57 -128 0 0 37 58 50 13 43 49.5 26 145 -10 37 15 25 38 43 7 37 12 25 38 46 15 -1.57 -127 0 0 37 55 39 13 43 52.1 26 145 -9 37 12 17 38 39 55 37 9 17 38 43 3 -1.57 -126 0 0 37 53 2 13 43 54.8 27 146 -9 37 9 41 38 37 16 37 6 41 38 40 23 -1.57 -125 0 0 37 50 57 13 43 57.6 27 147 -8 37 7 37 38 35 11 37 4 38 38 38 18 -1.57 -124 0 0 37 49 26 13 44 0.3 28 148 -7 37 6 6 38 33 38 37 3 7 38 36 45 -1.57 -123 0 0 37 48 27 13 44 3.2 28 149 -6 37 5 8 38 32 39 37 2 9 38 35 46 -1.57 -122 0 0 37 48 1 13 44 6.0 29 150 -5 37 4 43 38 32 13 37 1 43 38 35 20 -1.57 -121 0 0 37 48 9 13 44 8.9 29 151 -5 37 4 50 38 32 21 37 1 50 38 35 28 -1.58 -120 0 0 37 48 49 13 44 11.9 29 152 -4 37 5 30 38 33 1 37 2 30 38 36 9 -1.58 -119 0 0 37 50 2 13 44 14.8 30 153 -3 37 6 42 38 34 16 37 3 42 38 37 23 -1.58 -118 0 0 37 51 49 13 44 17.8 30 154 -2 37 8 27 38 36 4 37 5 28 38 39 11 -1.58 -117 0 0 37 54 9 13 44 20.9 30 155 -1 37 10 45 38 38 25 37 7 46 38 41 32 -1.58 -116 0 0 37 57 1 13 44 23.9 31 157 -1 37 13 36 38 41 19 37 10 36 38 44 27 -1.58 -115 0 0 38 0 26 13 44 27.0 31 158 0 37 16 59 38 44 47 37 13 59 38 47 55 -1.58 -114 0 0 38 4 25 13 44 30.1 31 159 1 37 20 55 38 48 48 37 17 55 38 51 56 -1.58 -113 0 0 38 8 56 13 44 33.2 31 160 2 37 25 23 38 53 22 37 22 23 38 56 30 -1.58 -112 0 0 38 14 0 13 44 36.4 32 161 3 37 30 24 38 58 29 37 27 24 39 1 37 -1.58 -111 0 0 38 19 36 13 44 39.5 32 162 3 37 35 57 39 4 9 37 32 57 39 7 18 -1.58 -110 0 0 38 25 45 13 44 42.7 32 163 4 37 42 3 39 10 23 37 39 2 39 13 31 -1.58 -109 0 0 38 32 27 13 44 45.9 32 164 5 37 48 40 39 17 8 37 45 39 39 20 18 -1.58 -108 0 0 38 39 41 13 44 49.1 32 165 6 37 55 49 39 24 27 37 52 48 39 27 36 -1.58 -107 0 0 38 47 27 13 44 52.3 32 166 7 38 3 31 39 32 18 38 0 29 39 35 28 -1.59 -106 0 0 38 55 45 13 44 55.5 32 168 7 38 11 44 39 40 41 38 8 41 39 43 52 -1.59 -105 0 0 39 4 35 13 44 58.7 32 169 8 38 20 28 39 49 37 38 17 26 39 52 48 -1.59 -104 0 0 39 13 57 13 45 1.9 32 170 9 38 29 45 39 59 5 38 26 42 40 2 16 -1.59 -103 0 0 39 23 50 13 45 5.1 32 171 10 38 39 32 40 9 5 38 36 28 40 12 16 -1.59 -102 0 0 39 34 15 13 45 8.3 32 172 10 38 49 50 40 19 36 38 46 46 40 22 48 -1.59 -101 0 0 39 45 10 13 45 11.5 32 173 11 39 0 39 40 30 39 38 57 35 40 33 51 -1.59 -100 0 0 39 56 37 13 45 14.7 32 175 12 39 11 59 40 42 13 39 8 54 40 45 26 -1.59 - 99 0 0 40 8 34 13 45 17.9 32 176 13 39 23 48 40 54 17 39 20 43 40 57 31 -1.59 - 98 0 0 40 21 1 13 45 21.0 32 177 13 39 36 8 41 6 53 39 33 2 41 10 7 -1.59 - 97 0 0 40 33 58 13 45 24.2 31 178 14 39 48 58 41 19 58 39 45 51 41 23 13 -1.59 - 96 0 0 40 47 25 13 45 27.3 31 179 15 40 2 17 41 33 34 39 59 10 41 36 50 -1.59 - 95 0 0 41 1 22 13 45 30.4 31 180 15 40 16 5 41 47 40 40 12 57 41 50 56 -1.59 - 94 0 0 41 15 48 13 45 33.5 31 181 16 40 30 22 42 2 15 40 27 14 42 5 32 -1.59 - 93 0 0 41 30 42 13 45 36.6 31 182 17 40 45 7 42 17 19 40 41 58 42 20 36 -1.59 - 92 0 0 41 46 5 13 45 39.6 30 184 18 41 0 20 42 32 52 40 57 11 42 36 10 -1.59 - 91 0 0 42 1 55 13 45 42.6 30 185 18 41 16 1 42 48 53 41 12 52 42 52 12 -1.59 - 90 0 0 42 18 14 13 45 45.6 30 186 19 41 32 10 43 5 22 41 28 59 43 8 41 -1.59 - 89 0 0 42 34 59 13 45 48.5 29 187 19 41 48 45 43 22 18 41 45 34 43 25 39 -1.59 - 88 0 0 42 52 11 13 45 51.4 29 188 20 42 5 47 43 39 41 42 2 35 43 43 3 -1.59 - 87 0 0 43 9 50 13 45 54.3 28 189 21 42 23 15 43 57 31 42 20 2 44 0 54 -1.59 - 86 0 0 43 27 54 13 45 57.1 28 190 21 42 41 8 44 15 47 42 37 55 44 19 10 -1.59 - 85 0 0 43 46 24 13 45 59.9 28 191 22 42 59 26 44 34 29 42 56 12 44 37 53 -1.59 - 84 0 0 44 5 18 13 46 2.6 27 192 22 43 18 9 44 53 35 43 14 54 44 57 0 -1.59 - 83 0 0 44 24 36 13 46 5.3 27 193 23 43 37 16 45 13 6 43 34 0 45 16 32 -1.59 - 82 0 0 44 44 19 13 46 8.0 26 194 24 43 56 46 45 33 1 43 53 30 45 36 28 -1.59 - 81 0 0 45 4 24 13 46 10.6 26 195 24 44 16 39 45 53 20 44 13 22 45 56 47 -1.59 - 80 0 0 45 24 51 13 46 13.1 25 196 25 44 36 55 46 14 1 44 33 37 46 17 29 -1.59 - 79 0 0 45 45 41 13 46 15.6 25 197 25 44 57 32 46 35 4 44 54 13 46 38 33 -1.59 - 78 0 0 46 6 52 13 46 18.0 24 198 25 45 18 30 46 56 28 45 15 10 46 59 58 -1.59 - 77 0 0 46 28 23 13 46 20.4 23 199 26 45 39 48 47 18 13 45 36 27 47 21 45 -1.59 - 76 0 0 46 50 14 13 46 22.7 23 200 26 46 1 26 47 40 18 45 58 5 47 43 51 -1.59 - 75 0 0 47 12 24 13 46 25.0 22 201 27 46 23 23 48 2 42 46 20 1 48 6 16 -1.59 - 74 0 0 47 34 52 13 46 27.1 22 202 27 46 45 38 48 25 25 46 42 15 48 29 0 -1.59 - 73 0 0 47 57 39 13 46 29.3 21 203 28 47 8 11 48 48 26 47 4 47 48 52 2 -1.59 - 72 0 0 48 20 42 13 46 31.3 20 204 28 47 31 0 49 11 44 47 27 35 49 15 21 -1.59 - 71 0 0 48 44 1 13 46 33.3 20 205 28 47 54 6 49 35 18 47 50 40 49 38 56 -1.60 - 70 0 0 49 7 35 13 46 35.3 19 206 29 48 17 26 49 59 7 48 14 0 50 2 46 -1.60 - 69 0 0 49 31 24 13 46 37.1 19 207 29 48 41 2 50 23 11 48 37 34 50 26 51 -1.60 - 68 0 0 49 55 26 13 46 38.9 18 207 29 49 4 50 50 47 28 49 1 21 50 51 9 -1.60 - 67 0 0 50 19 41 13 46 40.6 17 208 29 49 28 51 51 11 58 49 25 22 51 15 40 -1.60 - 66 0 0 50 44 8 13 46 42.3 17 209 30 49 53 5 51 36 40 49 49 34 51 40 23 -1.60 - 65 0 0 51 8 46 13 46 43.9 16 210 30 50 17 29 52 1 33 50 13 57 52 5 18 -1.60 - 64 0 0 51 33 34 13 46 45.4 15 211 30 50 42 3 52 26 36 50 38 30 52 30 22 -1.60 - 63 0 0 51 58 31 13 46 46.8 15 212 30 51 6 46 52 51 48 51 3 13 52 55 35 -1.60 - 62 0 0 52 23 36 13 46 48.2 14 213 30 51 31 38 53 17 8 51 28 3 53 20 56 -1.60 - 61 0 0 52 48 49 13 46 49.5 13 214 30 51 56 37 53 42 36 51 53 1 53 46 24 -1.60 - 60 0 0 53 14 7 13 46 50.7 13 215 30 52 21 42 54 8 9 52 18 6 54 11 59 -1.60 - 59 0 0 53 39 31 13 46 51.9 12 215 30 52 46 53 54 33 47 52 43 16 54 37 38 -1.60 - 58 0 0 54 5 0 13 46 53.0 11 216 31 53 12 8 54 59 30 53 8 30 55 3 22 -1.61 - 57 0 0 54 30 31 13 46 54.0 10 217 31 53 37 27 55 25 15 53 33 48 55 29 8 -1.61 - 56 0 0 54 56 5 13 46 54.9 10 218 31 54 2 48 55 51 3 53 59 9 55 54 57 -1.61 - 55 0 0 55 21 40 13 46 55.8 9 219 31 54 28 11 56 16 52 54 24 31 56 20 47 -1.61 - 54 0 0 55 47 16 13 46 56.6 8 220 31 54 53 35 56 42 41 54 49 54 56 46 37 -1.61 - 53 0 0 56 12 51 13 46 57.3 8 220 31 55 18 58 57 8 29 55 15 16 57 12 26 -1.62 - 52 0 0 56 38 25 13 46 58.0 7 221 30 55 44 20 57 34 15 55 40 38 57 38 13 -1.62 - 51 0 0 57 3 56 13 46 58.6 6 222 30 56 9 40 57 59 58 56 5 57 58 3 57 -1.62 - 50 0 0 57 29 23 13 46 59.1 6 223 30 56 34 57 58 25 37 56 31 13 58 29 37 -1.63 - 49 0 0 57 54 46 13 46 59.6 5 224 30 57 0 10 58 51 11 56 56 25 58 55 12 -1.63 - 48 0 0 58 20 4 13 47 0.0 4 225 30 57 25 18 59 16 40 57 21 32 59 20 41 -1.64 - 47 0 0 58 45 15 13 47 0.3 4 226 30 57 50 20 59 42 1 57 46 34 59 46 3 -1.65 - 46 0 0 59 10 19 13 47 0.6 3 226 30 58 15 15 60 7 15 58 11 28 60 11 17 -1.66 - 45 0 0 59 35 14 13 47 0.8 2 227 30 58 40 2 60 32 19 58 36 15 60 36 23 -1.69 - 44 0 0 60 0 1 13 47 1.0 2 228 29 59 4 41 60 57 14 59 0 53 61 1 19 -1.73 - 43 0 0 60 24 37 13 47 1.1 1 229 29 59 29 10 61 21 59 59 25 22 61 26 4 -1.81 - 42 0 0 60 49 3 13 47 1.1 0 230 29 59 53 30 .. .. .. 59 49 41 .. .. .. -2.21 - 41 0 0 .. .. .... .. .. .. .. .. .. 60 17 38 .. .. .. 60 13 49 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jan 27.8 Data for the target star ------------------------ * name: UCAC4-360-196987 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 26 38.8115 DE: -18 07 17.642 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 26 38.8116 DE: -18 07 17.642 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (103) Hera asteroid class: approx. diameter [km]: 86 approx. diameter ["]: 0.044 distance from Earth [AU]: 2.70340 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#130 date of fit: 2022 Nov 25 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): 0.012", 0.001", 86.422° remarks: * orbital elements for (103)Hera : Mean anomaly = 310.7173529746 deg Arg. of pericenter = 189.3589544857 deg Long. of node = 136.0685262011 deg Inclination = 5.4186081775 deg Eccentricity = 0.0791542421 Semimajor axis = 2.7016861708 AU Perihelion dist = 2.4878362495 AU Mag: H = 7.72, G = 0.15 Epoch of elements : MJD 60026.57298611 TDT (2023 Mar 23.5730) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1302022Nov25,3.09,2023,3,23,13.749845,-0.131215,0.834094,15.513283,2.442070,-0.005418,-0.000698,0.000000,0.000000 -95.0447,-18.0766,-24.59,1.06,False UCAC4-360-196987,19.44411428,-18.1215674,0.00,12.49,0.00,0.0,0,,19.46626481,-18.0766211,1.03,0.00,0,0,0 103,Hera,12.99,86.0,2.7034,0,0,3.539,7.95,,4.4,0 0,310.5902,2023,3,23,189.3590,136.0685,5.4186,0.07915,2.70169,2.48784,7.73,5.0,0.15 1.035,0.0117,0.0011,86,0.0015,Known errors,-1.00,-1,-1,-1 20230323_196987,59971.82 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jan 27, 19:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org