IOTA/IOTA-ES occultation update for (54) Alexandra / TYC 6915-01298-1 event on 2023 Jun 22, 16:01 UT Visible from Japan Summary ------- On 2023 Jun 22 UT, the 152.1 km diameter asteroid (54) Alexandra will occult a 9.3 mag star in the constellation Microscopium for observers along a path across Japan. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.85 mag to 10.91 mag (the magnitude of the asteroid) for at most 34.030 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: 99 * date and approx. time of event: 2023 Jun 22, 15:44 - 2023 Jun 22, 16:19 * geocentric midpoint of event [JD]: 2460118.16797404 * magnitude of target star: 9.28 * magnitude drop [mag]: 1.85 * estimated maximum duration [s]: 34.030 * Moon: 18 % sunlit, 162° distance * Sun: 147° distance * rough path description: Japan The occultation path -------------------- * approximate projected width [km]: 219 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.014) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.001", 63°) * approx speed of asteroid's shadow [km/s]: 4.4694 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6915-01298-1 by 54 Alexandra on 2023 Jun 22 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 107 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 52 51 50 .... 108 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 52 32 10 .. .. .. 52 7 4 .... 109 0 0 53 24 30 16 18 18.6 1 142 -13 .. .. .. 51 46 55 .. .. .. 51 21 56 .... 110 0 0 52 38 22 16 18 18.1 1 143 -14 54 20 19 51 1 20 .. .. .. 50 36 29 -0.55 111 0 0 51 51 55 16 18 17.0 2 144 -15 53 33 11 50 15 29 54 0 47 49 50 47 -0.77 112 0 0 51 5 12 16 18 15.2 3 145 -16 52 45 45 49 29 24 53 13 8 49 4 52 -0.87 113 0 0 50 18 16 16 18 12.8 4 146 -16 51 58 4 48 43 9 52 25 14 48 18 47 -0.93 114 0 0 49 31 11 16 18 9.7 5 146 -17 51 10 11 47 56 46 51 37 8 47 32 34 -0.96 115 0 0 48 44 0 16 18 6.0 6 147 -18 50 22 10 47 10 18 50 48 52 46 46 17 -0.99 116 0 0 47 56 45 16 18 1.6 7 148 -19 49 34 4 46 23 48 50 0 32 45 59 58 -1.00 117 0 0 47 9 29 16 17 56.6 9 149 -20 48 45 56 45 37 18 49 12 9 45 13 39 -1.02 118 0 0 46 22 15 16 17 50.9 10 149 -20 47 57 49 44 50 52 48 23 46 44 27 24 -1.03 119 0 0 45 35 6 16 17 44.4 11 150 -21 47 9 46 44 4 31 47 35 28 43 41 15 -1.04 120 0 0 44 48 5 16 17 37.4 12 151 -22 46 21 50 43 18 18 46 47 16 42 55 15 -1.04 121 0 0 44 1 14 16 17 29.6 13 151 -23 45 34 3 42 32 16 45 59 14 42 9 24 -1.05 122 0 0 43 14 35 16 17 21.2 14 152 -23 44 46 29 41 46 26 45 11 24 41 23 47 -1.06 123 0 0 42 28 11 16 17 12.1 15 153 -24 43 59 9 41 0 52 44 23 48 40 38 24 -1.06 124 0 0 41 42 3 16 17 2.4 16 154 -25 43 12 6 40 15 33 43 36 29 39 53 18 -1.06 125 0 0 40 56 15 16 16 52.0 17 154 -25 42 25 22 39 30 34 42 49 29 39 8 31 -1.07 126 0 0 40 10 47 16 16 41.0 18 155 -26 41 38 59 38 45 55 42 2 51 38 24 4 -1.07 127 0 0 39 25 41 16 16 29.3 19 156 -27 40 53 0 38 1 39 41 16 36 37 40 0 -1.07 128 0 0 38 41 1 16 16 17.1 20 157 -27 40 7 25 37 17 46 40 30 46 36 56 19 -1.07 129 0 0 37 56 45 16 16 4.3 21 157 -28 39 22 17 36 34 19 39 45 22 36 13 3 -1.07 130 0 0 37 12 58 16 15 50.9 22 158 -28 38 37 36 35 51 18 39 0 27 35 30 14 -1.07 131 0 0 36 29 39 16 15 36.9 22 159 -29 37 53 25 35 8 46 38 16 2 34 47 53 -1.07 132 0 0 35 46 49 16 15 22.4 23 159 -29 37 9 45 34 26 42 37 32 7 34 6 2 -1.08 133 0 0 35 4 31 16 15 7.4 24 160 -30 36 26 37 33 45 9 36 48 45 33 24 40 -1.08 134 0 0 34 22 45 16 14 51.8 25 161 -30 35 44 2 33 4 8 36 5 56 32 43 49 -1.08 135 0 0 33 41 33 16 14 35.8 26 162 -30 35 2 2 32 23 39 35 23 42 32 3 31 -1.08 136 0 0 33 0 54 16 14 19.3 27 163 -31 34 20 36 31 43 43 34 42 3 31 23 46 -1.08 137 0 0 32 20 51 16 14 2.4 28 163 -31 33 39 47 31 4 21 34 1 1 30 44 34 -1.07 138 0 0 31 41 23 16 13 45.0 29 164 -31 32 59 34 30 25 34 33 20 35 30 5 57 -1.07 139 0 0 31 2 31 16 13 27.2 30 165 -32 32 19 58 29 47 22 32 40 48 29 27 56 -1.07 140 0 0 30 24 16 16 13 8.9 30 166 -32 31 41 1 29 9 47 32 1 38 28 50 30 -1.07 141 0 0 29 46 40 16 12 50.4 31 167 -32 31 2 42 28 32 48 31 23 8 28 13 41 -1.07 142 0 0 29 9 41 16 12 31.4 32 167 -32 30 25 3 27 56 26 30 45 18 27 37 28 -1.07 143 0 0 28 33 20 16 12 12.1 33 168 -33 29 48 3 27 20 42 30 8 6 27 1 53 -1.07 144 0 0 27 57 39 16 11 52.5 33 169 -33 29 11 42 26 45 36 29 31 35 26 26 56 -1.07 145 0 0 27 22 36 16 11 32.5 34 170 -33 28 36 3 26 11 8 28 55 45 25 52 37 -1.07 146 0 0 26 48 14 16 11 12.3 35 171 -33 28 1 3 25 37 19 28 20 36 25 18 56 -1.07 147 0 0 26 14 31 16 10 51.8 36 172 -33 27 26 45 25 4 9 27 46 8 24 45 54 -1.07 148 0 0 25 41 28 16 10 31.1 36 173 -33 26 53 8 24 31 38 27 12 21 24 13 31 -1.06 149 0 0 25 9 6 16 10 10.1 37 174 -33 26 20 12 23 59 46 26 39 16 23 41 47 -1.06 150 0 0 24 37 24 16 9 48.8 37 175 -33 25 47 58 23 28 34 26 6 53 23 10 42 -1.06 151 0 0 24 6 22 16 9 27.4 38 176 -33 25 16 25 22 58 2 25 35 11 22 40 17 -1.06 152 0 0 23 36 2 16 9 5.8 39 177 -33 24 45 34 22 28 9 25 4 12 22 10 32 -1.06 153 0 0 23 6 22 16 8 44.0 39 178 -33 24 15 25 21 58 57 24 33 54 21 41 26 -1.06 154 0 0 22 37 23 16 8 22.0 40 179 -32 23 45 58 21 30 25 24 4 19 21 13 1 -1.06 155 0 0 22 9 6 16 7 59.9 40 180 -32 23 17 13 21 2 33 23 35 26 20 45 15 -1.05 156 0 0 21 41 29 16 7 37.6 41 181 -32 22 49 9 20 35 21 23 7 16 20 18 10 -1.05 157 0 0 21 14 33 16 7 15.3 41 182 -32 22 21 48 20 8 49 22 39 47 19 51 44 -1.05 158 0 0 20 48 19 16 6 52.8 41 183 -32 21 55 9 19 42 58 22 13 1 19 25 59 -1.05 159 0 0 20 22 46 16 6 30.2 42 184 -31 21 29 12 19 17 47 21 46 57 19 0 54 -1.05 160 0 0 19 57 54 16 6 7.6 42 185 -31 21 3 56 18 53 17 21 21 36 18 36 29 -1.05 161 0 0 19 33 43 16 5 44.8 42 186 -31 20 39 23 18 29 27 20 56 56 18 12 44 -1.05 162 0 0 19 10 13 16 5 22.1 43 187 -30 20 15 32 18 6 17 20 32 59 17 49 39 -1.05 163 0 0 18 47 24 16 4 59.2 43 189 -30 19 52 22 17 43 48 20 9 44 17 27 15 -1.05 164 0 0 18 25 16 16 4 36.4 43 190 -30 19 29 55 17 21 59 19 47 11 17 5 31 -1.04 165 0 0 18 3 50 16 4 13.5 43 191 -29 19 8 9 17 0 50 19 25 19 16 44 26 -1.04 166 0 0 17 43 4 16 3 50.6 44 192 -29 18 47 5 16 40 22 19 4 10 16 24 2 -1.04 167 0 0 17 23 0 16 3 27.7 44 193 -28 18 26 42 16 20 33 18 43 43 16 4 18 -1.04 168 0 0 17 3 36 16 3 4.8 44 194 -28 18 7 2 16 1 26 18 23 58 15 45 15 -1.04 169 0 0 16 44 53 16 2 42.0 44 195 -27 17 48 3 15 42 58 18 4 55 15 26 51 -1.04 170 0 0 16 26 51 16 2 19.2 44 197 -27 17 29 45 15 25 11 17 46 33 15 9 7 -1.04 171 0 0 16 9 30 16 1 56.4 44 198 -26 17 12 10 15 8 3 17 28 53 14 52 3 -1.04 172 0 0 15 52 50 16 1 33.6 44 199 -26 16 55 15 14 51 36 17 11 55 14 35 39 -1.04 173 0 0 15 36 50 16 1 11.0 44 200 -25 16 39 2 14 35 49 16 55 38 14 19 56 -1.04 174 0 0 15 21 31 16 0 48.3 44 201 -25 16 23 31 14 20 42 16 40 3 14 4 52 -1.04 175 0 0 15 6 53 16 0 25.8 44 202 -24 16 8 41 14 6 15 16 25 10 13 50 27 -1.04 176 0 0 14 52 55 16 0 3.4 44 203 -24 15 54 32 13 52 28 16 10 58 13 36 43 -1.04 177 0 0 14 39 38 15 59 41.0 43 204 -23 15 41 4 13 39 21 15 57 27 13 23 39 -1.04 178 0 0 14 27 2 15 59 18.8 43 205 -22 15 28 18 13 26 54 15 44 38 13 11 15 -1.04 179 0 0 14 15 7 15 58 56.6 43 206 -22 15 16 13 13 15 8 15 32 31 12 59 30 -1.04 180 0 0 14 3 52 15 58 34.6 43 207 -21 15 4 49 13 4 1 15 21 5 12 48 25 -1.04 -179 0 0 13 53 17 15 58 12.7 43 208 -20 14 54 7 12 53 34 15 10 20 12 38 0 -1.04 -178 0 0 13 43 23 15 57 51.0 42 209 -20 14 44 6 12 43 47 15 0 17 12 28 15 -1.04 -177 0 0 13 34 10 15 57 29.3 42 210 -19 14 34 46 12 34 40 14 50 55 12 19 10 -1.04 -176 0 0 13 25 38 15 57 7.9 42 211 -18 14 26 7 12 26 14 14 42 15 12 10 45 -1.04 -175 0 0 13 17 46 15 56 46.6 41 212 -18 14 18 10 12 18 27 14 34 16 12 3 0 -1.04 -174 0 0 13 10 35 15 56 25.4 41 213 -17 14 10 54 12 11 21 14 26 59 11 55 54 -1.04 -173 0 0 13 4 5 15 56 4.5 40 214 -16 14 4 19 12 4 54 14 20 23 11 49 29 -1.04 -172 0 0 12 58 15 15 55 43.7 40 215 -16 13 58 26 11 59 8 14 14 29 11 43 44 -1.04 -171 0 0 12 53 7 15 55 23.1 40 216 -15 13 53 15 11 54 3 14 9 17 11 38 39 -1.04 -170 0 0 12 48 39 15 55 2.7 39 217 -14 13 48 45 11 49 37 14 4 46 11 34 14 -1.04 -169 0 0 12 44 52 15 54 42.5 39 217 -13 13 44 56 11 45 52 14 0 57 11 30 30 -1.04 -168 0 0 12 41 47 15 54 22.5 38 218 -13 13 41 50 11 42 48 13 57 51 11 27 26 -1.04 -167 0 0 12 39 23 15 54 2.7 38 219 -12 13 39 25 11 40 24 13 55 26 11 25 2 -1.04 -166 0 0 12 37 40 15 53 43.2 37 220 -11 13 37 42 11 38 41 13 53 43 11 23 19 -1.04 -165 0 0 12 36 38 15 53 23.9 37 220 -10 13 36 42 11 37 39 13 52 43 11 22 17 -1.04 -164 0 0 12 36 19 15 53 4.8 36 221 -9 13 36 23 11 37 18 13 52 25 11 21 55 -1.05 -163 0 0 12 36 40 15 52 46.0 35 222 -9 13 36 47 11 37 38 13 52 49 11 22 15 -1.05 -162 0 0 12 37 44 15 52 27.4 35 223 -8 13 37 54 11 38 39 13 53 56 11 23 15 -1.05 -161 0 0 12 39 30 15 52 9.1 34 223 -7 13 39 43 11 40 22 13 55 46 11 24 57 -1.05 -160 0 0 12 41 58 15 51 51.1 33 224 -6 13 42 15 11 42 46 13 58 19 11 27 20 -1.05 -159 0 0 12 45 8 15 51 33.4 33 224 -5 13 45 30 11 45 52 14 1 35 11 30 25 -1.05 -158 0 0 12 49 1 15 51 15.9 32 225 -5 13 49 28 11 49 40 14 5 35 11 34 12 -1.05 -157 0 0 12 53 37 15 50 58.7 31 226 -4 13 54 10 11 54 10 14 10 18 11 38 40 -1.06 -156 0 0 12 58 55 15 50 41.9 31 226 -3 13 59 35 11 59 22 14 15 45 11 43 51 -1.06 -155 0 0 13 4 57 15 50 25.3 30 227 -2 14 5 44 12 5 17 14 21 57 11 49 44 -1.06 -154 0 0 13 11 42 15 50 9.1 29 227 -1 14 12 37 12 11 54 14 28 52 11 56 20 -1.06 -153 0 0 13 19 11 15 49 53.2 28 228 0 14 20 15 12 19 15 14 36 32 12 3 38 -1.06 -152 0 0 13 27 24 15 49 37.7 28 228 1 14 28 37 12 27 19 14 44 57 12 11 40 -1.06 -151 0 0 13 36 21 15 49 22.5 27 229 2 14 37 44 12 36 6 14 54 7 12 20 24 -1.07 -150 0 0 13 46 2 15 49 7.6 26 229 3 14 47 37 12 45 37 15 4 2 12 29 53 -1.07 -149 0 0 13 56 28 15 48 53.2 25 229 3 14 58 14 12 55 52 15 14 43 12 40 5 -1.07 -148 0 0 14 7 39 15 48 39.1 25 230 4 15 9 38 13 6 51 15 26 11 12 51 1 -1.07 -147 0 0 14 19 36 15 48 25.4 24 230 5 15 21 48 13 18 35 15 38 24 13 2 42 -1.08 -146 0 0 14 32 18 15 48 12.1 23 231 6 15 34 44 13 31 4 15 51 24 13 15 8 -1.08 -145 0 0 14 45 46 15 47 59.2 22 231 7 15 48 27 13 44 18 16 5 11 13 28 18 -1.08 -144 0 0 15 0 1 15 47 46.7 21 232 8 16 2 57 13 58 18 16 19 46 13 42 14 -1.08 -143 0 0 15 15 2 15 47 34.6 20 232 9 16 18 15 14 13 3 16 35 8 13 56 55 -1.09 -142 0 0 15 30 50 15 47 23.0 19 232 10 16 34 21 14 28 35 16 51 18 14 12 23 -1.09 -141 0 0 15 47 25 15 47 11.9 18 233 11 16 51 14 14 44 53 17 8 17 14 28 37 -1.09 -140 0 0 16 4 48 15 47 1.2 18 233 12 17 8 57 15 1 58 17 26 5 14 45 37 -1.10 -139 0 0 16 22 59 15 46 51.0 17 233 13 17 27 28 15 19 50 17 44 42 15 3 25 -1.10 -138 0 0 16 41 59 15 46 41.3 16 234 14 17 46 49 15 38 30 18 4 8 15 21 59 -1.10 -137 0 0 17 1 48 15 46 32.1 15 234 15 18 6 59 15 57 58 18 24 25 15 41 22 -1.11 -136 0 0 17 22 25 15 46 23.4 14 235 16 18 28 0 16 18 14 18 45 32 16 1 33 -1.11 -135 0 0 17 43 52 15 46 15.2 13 235 17 18 49 52 16 39 19 19 7 30 16 22 32 -1.11 -134 0 0 18 6 10 15 46 7.6 12 235 18 19 12 34 17 1 13 19 30 19 16 44 19 -1.12 -133 0 0 18 29 17 15 46 0.5 11 236 19 19 36 8 17 23 56 19 54 0 17 6 56 -1.12 -132 0 0 18 53 15 15 45 54.0 10 236 20 20 0 33 17 47 28 20 18 33 17 30 22 -1.13 -131 0 0 19 18 5 15 45 48.1 9 236 21 20 25 51 18 11 51 20 43 59 17 54 39 -1.13 -130 0 0 19 43 45 15 45 42.7 8 237 22 20 52 1 18 37 4 21 10 17 18 19 45 -1.14 -129 0 0 20 10 18 15 45 38.0 7 237 23 21 19 4 19 3 8 21 37 28 18 45 42 -1.15 -128 0 0 20 37 42 15 45 33.9 6 237 24 21 47 0 19 30 3 22 5 34 19 12 29 -1.16 -127 0 0 21 5 59 15 45 30.4 5 238 25 22 15 50 19 57 49 22 34 33 19 40 8 -1.17 -126 0 0 21 35 9 15 45 27.6 4 238 26 22 45 34 20 26 27 23 4 26 20 8 37 -1.20 -125 0 0 22 5 12 15 45 25.5 3 238 27 23 16 13 20 55 57 23 35 14 20 37 59 -1.23 -124 0 0 22 36 8 15 45 24.0 2 239 28 23 47 45 21 26 19 24 6 57 21 8 12 -1.31 -123 0 0 23 7 57 15 45 23.3 1 239 29 24 20 13 21 57 33 .. .. .. 21 39 17 -1.62 -122 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 22 29 39 .. .. .. 22 11 14 .... Uncertainty in time = +/- 6 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 6915-01298-1 * constellation : Microscopium * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 29 37.0423 DE: -27 57 21.835 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 29 37.0424 DE: -27 57 21.835 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (54) Alexandra asteroid class: approx. diameter [km]: 152 approx. diameter ["]: 0.166 distance from Earth [AU]: 1.26110 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#193 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): 0.030", 0.001", 63.277° remarks: * orbital elements for (54)Alexandra : Mean anomaly = 353.0632004002 deg Arg. of pericenter = 345.2827599371 deg Long. of node = 313.2299474137 deg Inclination = 11.7967884138 deg Eccentricity = 0.1967413872 Semimajor axis = 2.7107334980 AU Perihelion dist = 2.1774200292 AU Mag: H = 7.87, G = 0.15 Epoch of elements : MJD 60117.66770833 TDT (2023 Jun 22.6677) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1932023Apr24,34.03,2023,6,22,16.031377,0.239569,0.678920,-2.378812,0.839625,-0.002865,-0.000035,0.000001,0.000000 156.7135,-27.8769,-59.96,23.43,False TYC 6915-01298-1,20.49362285,-27.9560653,0.00,9.28,0.00,0.0,0,,20.51754187,-27.8769351,1.84,0.00,0,0,0 54,Alexandra,10.91,152.1,1.2611,0,0,-1.252,5.86,,7.6,0 0,352.9157,2023,6,22,345.2828,313.2299,11.7968,0.19674,2.71073,2.17742,7.88,5.0,0.15 1.132,0.0303,0.0015,63,0.0219,Known errors,-1.00,-1,-1,-1 20230622_1298-1,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org