IOTA/IOTA-ES occultation update for (13023) 1988 XT1 / UCAC4 237-122796 event on 2024 Jul 20, 23:01 UT Visible from Summary ------- On 2024 Jul 20 UT, the 15.9365258491289 km diameter asteroid (13023) 1988 XT1 will occult a 10.9 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.60 mag to 18.53 mag (the magnitude of the asteroid) for at most 1.400 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: 96 * date and approx. time of event: 2024 Jul 20, 22:54 - 2024 Jul 20, 23:08 * geocentric midpoint of event [JD]: 2460512.45954630 * magnitude of target star: 10.93 * magnitude drop [mag]: 7.60 * estimated maximum duration [s]: 1.400 * Moon: 99 % sunlit, 30° distance * Sun: 142° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.003", 105°) * approx speed of asteroid's shadow [km/s]: 11.5628 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 237-122796 by 13023 1988 XT1 on 2024 Jul 20 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 - 70 0 0 36 10 43 23 8 34.0 0 147 8 36 21 46 35 59 43 .. .. .. 35 50 24 .... - 69 0 0 34 56 6 23 8 33.7 2 148 6 35 6 55 34 45 20 35 16 11 34 36 13 -0.38 - 68 0 0 33 42 40 23 8 32.9 3 148 5 33 53 16 33 32 7 34 2 19 33 23 11 -0.64 - 67 0 0 32 30 27 23 8 31.7 5 149 4 32 40 50 32 20 8 32 49 42 32 11 22 -0.73 - 66 0 0 31 19 30 23 8 29.9 6 149 3 31 29 40 31 9 23 31 38 22 31 0 48 -0.78 - 65 0 0 30 9 51 23 8 27.8 8 150 2 30 19 49 29 59 56 30 28 20 29 51 31 -0.81 - 64 0 0 29 1 31 23 8 25.1 9 150 0 29 11 18 28 51 47 29 19 39 28 43 32 -0.83 - 63 0 0 27 54 32 23 8 22.1 10 151 -1 28 4 7 27 44 59 28 12 19 27 36 53 -0.85 - 62 0 0 26 48 54 23 8 18.7 12 151 -2 26 58 18 26 39 31 27 6 21 26 31 34 -0.86 - 61 0 0 25 44 38 23 8 14.8 13 152 -3 25 53 52 25 35 25 26 1 46 25 27 37 -0.87 - 60 0 0 24 41 44 23 8 10.7 14 152 -5 24 50 49 24 32 41 24 58 34 24 25 1 -0.88 - 59 0 0 23 40 14 23 8 6.1 16 153 -6 23 49 9 23 31 20 23 56 46 23 23 48 -0.88 - 58 0 0 22 40 6 23 8 1.2 17 153 -7 22 48 53 22 31 22 22 56 22 22 23 57 -0.89 - 57 0 0 21 41 22 23 7 56.0 18 154 -8 21 50 0 21 32 46 21 57 22 21 25 28 -0.89 - 56 0 0 20 44 1 23 7 50.5 20 154 -10 20 52 30 20 35 33 20 59 45 20 28 21 -0.89 - 55 0 0 19 48 2 23 7 44.7 21 155 -11 19 56 24 19 39 42 20 3 32 19 32 37 -0.89 - 54 0 0 18 53 25 23 7 38.6 22 155 -12 19 1 40 18 45 12 19 8 42 18 38 14 -0.90 - 53 0 0 18 0 11 23 7 32.2 23 156 -13 18 8 18 17 52 5 18 15 13 17 45 13 -0.90 - 52 0 0 17 8 17 23 7 25.6 24 156 -15 17 16 17 17 0 18 17 23 7 16 53 32 -0.90 - 51 0 0 16 17 44 23 7 18.8 26 157 -16 16 25 38 16 9 52 16 32 22 16 3 11 -0.90 - 50 0 0 15 28 31 23 7 11.8 27 157 -17 15 36 18 15 20 45 15 42 57 15 14 10 -0.90 - 49 0 0 14 40 37 23 7 4.5 28 158 -18 14 48 18 14 32 57 14 54 52 14 26 27 -0.90 - 48 0 0 13 54 2 23 6 57.1 29 159 -19 14 1 37 13 46 28 14 8 6 13 40 2 -0.90 - 47 0 0 13 8 44 23 6 49.5 30 159 -21 13 16 14 13 1 16 13 22 38 12 54 55 -0.90 - 46 0 0 12 24 44 23 6 41.7 31 160 -22 12 32 8 12 17 20 12 38 27 12 11 4 -0.90 - 45 0 0 11 41 59 23 6 33.7 32 160 -23 11 49 18 11 34 41 11 55 33 11 28 28 -0.90 - 44 0 0 11 0 29 23 6 25.6 33 161 -24 11 7 43 10 53 16 11 13 54 10 47 8 -0.90 - 43 0 0 10 20 14 23 6 17.4 34 162 -25 10 27 23 10 13 5 10 33 30 10 7 1 -0.90 - 42 0 0 9 41 12 23 6 9.0 35 162 -26 9 48 17 9 34 8 9 54 20 9 28 8 -0.90 - 41 0 0 9 3 23 23 6 0.6 36 163 -27 9 10 23 8 56 23 9 16 22 8 50 26 -0.90 - 40 0 0 8 26 45 23 5 52.0 36 164 -29 8 33 42 8 19 50 8 39 37 8 13 56 -0.90 - 39 0 0 7 51 19 23 5 43.3 37 164 -30 7 58 11 7 44 27 8 4 3 7 38 37 -0.90 - 38 0 0 7 17 2 23 5 34.5 38 165 -31 7 23 51 7 10 14 7 29 40 7 4 27 -0.90 - 37 0 0 6 43 55 23 5 25.7 39 166 -32 6 50 40 6 37 10 6 56 26 6 31 27 -0.90 - 36 0 0 6 11 56 23 5 16.7 40 166 -33 6 18 38 6 5 15 6 24 21 5 59 34 -0.90 - 35 0 0 5 41 5 23 5 7.7 40 167 -34 5 47 43 5 34 27 5 53 23 5 28 49 -0.90 - 34 0 0 5 11 20 23 4 58.6 41 168 -35 5 17 56 5 4 46 5 23 33 4 59 10 -0.90 - 33 0 0 4 42 42 23 4 49.5 42 169 -36 4 49 14 4 36 10 4 54 49 4 30 38 -0.90 - 32 0 0 4 15 9 23 4 40.3 42 170 -37 4 21 38 4 8 40 4 27 10 4 3 10 -0.90 - 31 0 0 3 48 40 23 4 31.1 43 171 -38 3 55 7 3 42 14 4 0 37 3 36 46 -0.90 - 30 0 0 3 23 16 23 4 21.8 43 171 -39 3 29 40 3 16 52 3 35 7 3 11 26 -0.90 - 29 0 0 2 58 54 23 4 12.5 44 172 -40 3 5 16 2 52 33 3 10 41 2 47 10 -0.90 - 28 0 0 2 35 35 23 4 3.2 44 173 -41 2 41 55 2 29 17 2 47 18 2 23 55 -0.90 - 27 0 0 2 13 18 23 3 53.8 45 174 -42 2 19 35 2 7 2 2 24 57 2 1 42 -0.90 - 26 0 0 1 52 2 23 3 44.5 45 175 -43 1 58 17 1 45 48 2 3 37 1 40 30 -0.90 - 25 0 0 1 31 47 23 3 35.1 46 176 -44 1 38 0 1 25 35 1 43 18 1 20 19 -0.90 - 24 0 0 1 12 32 23 3 25.6 46 177 -45 1 18 43 1 6 22 1 24 0 1 1 7 -0.90 - 23 0 0 0 54 17 23 3 16.2 46 178 -46 1 0 26 0 48 8 1 5 41 0 42 55 -0.90 - 22 0 0 0 37 1 23 3 6.8 47 179 -47 0 43 8 0 30 54 0 48 21 0 25 42 -0.90 - 21 0 0 0 20 43 23 2 57.4 47 180 -48 0 26 49 0 14 38 0 32 1 0 9 27 -0.90 - 20 0 0 0 5 23 23 2 47.9 47 181 -49 0 11 28 - 0 0 41 0 16 38 - 0 5 50 -0.90 - 19 0 0 - 0 8 59 23 2 38.5 47 182 -50 - 0 2 56 - 0 15 1 0 2 14 - 0 20 9 -0.90 - 18 0 0 - 0 22 24 23 2 29.1 48 183 -51 - 0 16 22 - 0 28 25 - 0 11 13 - 0 33 32 -0.90 - 17 0 0 - 0 34 51 23 2 19.7 48 184 -52 - 0 28 51 - 0 40 51 - 0 23 43 - 0 45 57 -0.90 - 16 0 0 - 0 46 23 23 2 10.2 48 185 -53 - 0 40 23 - 0 52 21 - 0 35 17 - 0 57 27 -0.90 - 15 0 0 - 0 56 58 23 2 0.9 48 187 -54 - 0 50 59 - 1 2 55 - 0 45 53 - 1 8 0 -0.90 - 14 0 0 - 1 6 37 23 1 51.5 48 188 -55 - 1 0 39 - 1 12 34 - 0 55 34 - 1 17 37 -0.90 - 13 0 0 - 1 15 20 23 1 42.1 48 189 -56 - 1 9 23 - 1 21 16 - 1 4 19 - 1 26 19 -0.90 - 12 0 0 - 1 23 8 23 1 32.8 48 190 -56 - 1 17 12 - 1 29 3 - 1 12 8 - 1 34 6 -0.90 - 11 0 0 - 1 30 1 23 1 23.5 48 191 -57 - 1 24 5 - 1 35 55 - 1 19 2 - 1 40 57 -0.90 - 10 0 0 - 1 35 58 23 1 14.2 48 192 -58 - 1 30 3 - 1 41 53 - 1 25 1 - 1 46 54 -0.90 - 9 0 0 - 1 41 1 23 1 5.0 48 193 -59 - 1 35 7 - 1 46 55 - 1 30 4 - 1 51 56 -0.90 - 8 0 0 - 1 45 9 23 0 55.7 48 194 -60 - 1 39 15 - 1 51 2 - 1 34 13 - 1 56 3 -0.90 - 7 0 0 - 1 48 22 23 0 46.6 47 195 -61 - 1 42 29 - 1 54 16 - 1 37 27 - 1 59 16 -0.90 - 6 0 0 - 1 50 41 23 0 37.4 47 196 -61 - 1 44 47 - 1 56 34 - 1 39 46 - 2 1 34 -0.90 - 5 0 0 - 1 52 5 23 0 28.3 47 197 -62 - 1 46 12 - 1 57 58 - 1 41 10 - 2 2 58 -0.90 - 4 0 0 - 1 52 35 23 0 19.2 47 198 -63 - 1 46 41 - 1 58 28 - 1 41 40 - 2 3 28 -0.90 - 3 0 0 - 1 52 10 23 0 10.2 46 199 -63 - 1 46 17 - 1 58 3 - 1 41 15 - 2 3 3 -0.90 - 2 0 0 - 1 50 51 23 0 1.2 46 200 -64 - 1 44 57 - 1 56 44 - 1 39 55 - 2 1 44 -0.90 - 1 0 0 - 1 48 37 22 59 52.3 46 200 -65 - 1 42 43 - 1 54 30 - 1 37 41 - 1 59 30 -0.90 0 0 0 - 1 45 28 22 59 43.4 45 201 -65 - 1 39 33 - 1 51 21 - 1 34 31 - 1 56 22 -0.90 1 0 0 - 1 41 24 22 59 34.5 45 202 -66 - 1 35 29 - 1 47 18 - 1 30 27 - 1 52 19 -0.90 2 0 0 - 1 36 25 22 59 25.7 44 203 -66 - 1 30 30 - 1 42 20 - 1 25 27 - 1 47 21 -0.90 3 0 0 - 1 30 31 22 59 17.0 44 204 -67 - 1 24 35 - 1 36 26 - 1 19 32 - 1 41 28 -0.91 4 0 0 - 1 23 42 22 59 8.3 43 205 -67 - 1 17 45 - 1 29 37 - 1 12 41 - 1 34 40 -0.91 5 0 0 - 1 15 56 22 58 59.7 43 205 -68 - 1 9 59 - 1 21 53 - 1 4 54 - 1 26 56 -0.91 6 0 0 - 1 7 15 22 58 51.2 42 206 -68 - 1 1 17 - 1 13 13 - 0 56 12 - 1 18 17 -0.91 7 0 0 - 0 57 38 22 58 42.7 42 207 -68 - 0 51 39 - 1 3 36 - 0 46 32 - 1 8 41 -0.91 8 0 0 - 0 47 4 22 58 34.3 41 207 -68 - 0 41 3 - 0 53 3 - 0 35 56 - 0 58 9 -0.91 9 0 0 - 0 35 33 22 58 26.0 41 208 -69 - 0 29 31 - 0 41 33 - 0 24 23 - 0 46 40 -0.91 10 0 0 - 0 23 4 22 58 17.7 40 209 -69 - 0 17 1 - 0 29 6 - 0 11 52 - 0 34 14 -0.91 11 0 0 - 0 9 38 22 58 9.5 39 209 -69 - 0 3 34 - 0 15 41 0 1 36 - 0 20 50 -0.91 12 0 0 0 4 46 22 58 1.4 39 210 -69 0 10 52 - 0 1 18 0 16 3 - 0 6 28 -0.91 13 0 0 0 20 10 22 57 53.4 38 210 -69 0 26 17 0 14 3 0 31 29 0 8 52 -0.91 14 0 0 0 36 32 22 57 45.5 37 211 -69 0 42 41 0 30 24 0 47 55 0 25 11 -0.91 15 0 0 0 53 54 22 57 37.7 36 211 -69 1 0 5 0 47 44 1 5 20 0 42 30 -0.92 16 0 0 1 12 17 22 57 30.0 36 212 -68 1 18 29 1 6 5 1 23 46 1 0 49 -0.92 17 0 0 1 31 40 22 57 22.4 35 212 -68 1 37 54 1 25 26 1 43 14 1 20 9 -0.92 18 0 0 1 52 5 22 57 14.8 34 213 -68 1 58 22 1 45 49 2 3 43 1 40 30 -0.92 19 0 0 2 13 32 22 57 7.5 33 213 -67 2 19 51 2 7 14 2 25 14 2 1 53 -0.92 20 0 0 2 36 2 22 57 0.2 32 214 -67 2 42 24 2 29 42 2 47 48 2 24 19 -0.92 21 0 0 2 59 36 22 56 53.0 31 214 -66 3 6 0 2 53 13 3 11 27 2 47 48 -0.92 22 0 0 3 24 14 22 56 46.0 31 215 -66 3 30 40 3 17 49 3 36 10 3 12 21 -0.92 23 0 0 3 49 57 22 56 39.1 30 215 -65 3 56 26 3 43 29 4 1 58 3 37 59 -0.92 24 0 0 4 16 46 22 56 32.4 29 215 -65 4 23 18 4 10 15 4 28 52 4 4 43 -0.93 25 0 0 4 44 42 22 56 25.8 28 216 -64 4 51 17 4 38 8 4 56 54 4 32 33 -0.93 26 0 0 5 13 46 22 56 19.4 27 216 -63 5 20 24 5 7 8 5 26 3 5 1 31 -0.93 27 0 0 5 43 57 22 56 13.1 26 216 -62 5 50 39 5 37 17 5 56 21 5 31 37 -0.93 28 0 0 6 15 19 22 56 7.0 25 217 -61 6 22 4 6 8 35 6 27 49 6 2 51 -0.93 29 0 0 6 47 50 22 56 1.1 24 217 -61 6 54 39 6 41 3 7 0 27 6 35 16 -0.93 30 0 0 7 21 33 22 55 55.3 23 217 -60 7 28 25 7 14 42 7 34 17 7 8 52 -0.94 31 0 0 7 56 28 22 55 49.8 22 218 -59 8 3 24 7 49 33 8 9 20 7 43 40 -0.94 32 0 0 8 32 36 22 55 44.4 21 218 -58 8 39 37 8 25 37 8 45 36 8 19 40 -0.94 33 0 0 9 9 58 22 55 39.3 20 218 -57 9 17 3 9 2 54 9 23 6 8 56 54 -0.94 34 0 0 9 48 36 22 55 34.4 19 219 -56 9 55 45 9 41 27 10 1 52 9 35 23 -0.94 35 0 0 10 28 29 22 55 29.7 17 219 -55 10 35 44 10 21 16 10 41 54 10 15 8 -0.95 36 0 0 11 9 40 22 55 25.3 16 219 -54 11 17 0 11 2 22 11 23 14 10 56 10 -0.95 37 0 0 11 52 9 22 55 21.1 15 219 -53 11 59 34 11 44 45 12 5 53 11 38 29 -0.95 38 0 0 12 35 57 22 55 17.2 14 220 -52 12 43 27 12 28 28 12 49 51 12 22 7 -0.95 39 0 0 13 21 5 22 55 13.6 13 220 -50 13 28 41 13 13 31 13 35 10 13 7 5 -0.96 40 0 0 14 7 35 22 55 10.2 12 220 -49 14 15 17 13 59 54 14 21 51 13 53 23 -0.96 41 0 0 14 55 26 22 55 7.2 10 220 -48 15 3 14 14 47 40 15 9 54 14 41 3 -0.96 42 0 0 15 44 41 22 55 4.5 9 221 -47 15 52 36 15 36 48 15 59 21 15 30 6 -0.97 43 0 0 16 35 19 22 55 2.1 8 221 -46 16 43 21 16 27 20 16 50 12 16 20 32 -0.98 44 0 0 17 27 23 22 55 0.0 7 221 -44 17 35 31 17 19 16 17 42 28 17 12 22 -0.99 45 0 0 18 20 52 22 54 58.3 5 222 -43 18 29 8 18 12 37 18 36 11 18 5 38 -1.00 46 0 0 19 15 47 22 54 56.9 4 222 -42 19 24 11 19 7 25 19 31 21 19 0 19 -1.02 47 0 0 20 12 9 22 54 56.0 3 222 -40 20 20 41 20 3 39 20 27 58 19 56 26 -1.07 48 0 0 21 9 59 22 54 55.4 1 223 -39 21 18 39 21 1 20 21 26 3 20 54 0 -1.21 49 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 22 0 29 .. .. .. 21 53 2 .... Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 237-122796 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 33 16.1881 DE: -42 37 01.856 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 33 16.1880 DE: -42 37 01.856 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.9 * B mag [mag]: 11.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (13023) 1988 XT1 asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.68140 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#45 date of fit: 2023 Apr 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): 0.020", 0.003", 104.642° remarks: * orbital elements for (13023)1988 XT1 : Mean anomaly = 253.1226078431 deg Arg. of pericenter = 9.8706661084 deg Long. of node = 41.0960272013 deg Inclination = 17.9242919654 deg Eccentricity = 0.3003090778 Semimajor axis = 3.0563843198 AU Perihelion dist = 2.1385243634 AU Mag: H = 12.99, G = 0.15 Epoch of elements : MJD 60511.95954659 TDT (2024 Jul 20.9595) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#452023Apr25,1.40,2024,7,20,23.029111,0.132264,0.655736,-6.397693,1.289671,0.003202,0.001417,0.000001,0.000000 -20.8873,-42.6362,-163.82,20.42,False UCAC4 237-122796,17.55449670,-42.6171820,11.65,10.93,10.54,0.1,0,,17.58415904,-42.6361537,7.60,7.54,0,0,0 13023,1988 XT1,18.53,16.131,2.6814,0,0,-1.900,4.23,,1.6,0 0,252.9456,2024,7,20,9.8707,41.0960,17.9243,0.30031,3.05638,2.13852,12.99,5.0,0.15 1.426,0.0200,0.0033,105,0.0035,Known errors,0.88,0,-1,-1 20240720_122796,60140.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org