IOTA/IOTA-ES occultation update for (13023) 1988 XT1 / UCAC4 238-125054 event on 2024 Jul 23, 11:42 UT Visible from Summary ------- On 2024 Jul 23 UT, the 16.0104379427132 km diameter asteroid (13023) 1988 XT1 will occult a 11.2 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 7.36 mag to 18.56 mag (the magnitude of the asteroid) for at most 1.490 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: 97 * date and approx. time of event: 2024 Jul 23, 11:35 - 2024 Jul 23, 11:49 * geocentric midpoint of event [JD]: 2460514.98757875 * magnitude of target star: 11.20 * magnitude drop [mag]: 7.36 * estimated maximum duration [s]: 1.490 * Moon: 94 % sunlit, 64° distance * Sun: 140° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 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]: 10.8718 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 238-125054 by 13023 1988 XT1 on 2024 Jul 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 105 0 0 39 55 21 11 48 47.9 0 152 5 40 9 21 39 41 30 .. .. .. 39 30 26 .... 106 0 0 38 29 47 11 48 47.5 2 153 4 38 43 15 38 16 25 38 54 11 38 5 45 -0.48 107 0 0 37 6 34 11 48 46.4 4 153 2 37 19 35 36 53 40 37 30 7 36 43 22 -0.77 108 0 0 35 45 40 11 48 44.7 5 154 1 35 58 15 35 33 12 36 8 26 35 23 13 -0.88 109 0 0 34 27 1 11 48 42.4 7 155 0 34 39 12 34 14 55 34 49 4 34 5 16 -0.93 110 0 0 33 10 32 11 48 39.6 8 155 -1 33 22 21 32 58 48 33 31 55 32 49 25 -0.97 111 0 0 31 56 11 11 48 36.2 10 156 -3 32 7 40 31 44 47 32 16 57 31 35 40 -0.99 112 0 0 30 43 55 11 48 32.3 11 156 -4 30 55 5 30 32 49 31 4 7 30 23 56 -1.01 113 0 0 29 33 40 11 48 28.0 12 157 -5 29 44 32 29 22 51 29 53 20 29 14 12 -1.02 114 0 0 28 25 23 11 48 23.2 14 157 -7 28 35 59 28 14 50 28 44 33 28 6 24 -1.03 115 0 0 27 19 2 11 48 18.0 15 158 -8 27 29 23 27 8 44 27 37 45 27 0 30 -1.04 116 0 0 26 14 35 11 48 12.4 16 158 -9 26 24 42 26 4 31 26 32 52 25 56 28 -1.04 117 0 0 25 11 58 11 48 6.5 18 159 -10 25 21 52 25 2 7 25 29 51 24 54 14 -1.05 118 0 0 24 11 10 11 48 0.2 19 160 -12 24 20 51 24 1 31 24 28 40 23 53 48 -1.05 119 0 0 23 12 8 11 47 53.6 20 160 -13 23 21 37 23 2 41 23 29 16 22 55 7 -1.05 120 0 0 22 14 49 11 47 46.7 21 161 -14 22 24 8 22 5 34 22 31 38 21 58 8 -1.06 121 0 0 21 19 13 11 47 39.5 23 161 -15 21 28 21 21 10 7 21 35 43 21 2 50 -1.06 122 0 0 20 25 16 11 47 32.0 24 162 -17 20 34 14 20 16 20 20 41 28 20 9 11 -1.06 123 0 0 19 32 57 11 47 24.3 25 162 -18 19 41 46 19 24 10 19 48 52 19 17 8 -1.06 124 0 0 18 42 13 11 47 16.4 26 163 -19 18 50 53 18 33 35 18 57 53 18 26 40 -1.06 125 0 0 17 53 4 11 47 8.2 27 164 -20 18 1 35 17 44 34 18 8 28 17 37 45 -1.06 126 0 0 17 5 26 11 46 59.9 28 164 -21 17 13 50 16 57 4 17 20 36 16 50 22 -1.07 127 0 0 16 19 19 11 46 51.4 29 165 -23 16 27 35 16 11 4 16 34 16 16 4 28 -1.07 128 0 0 15 34 40 11 46 42.7 30 166 -24 15 42 50 15 26 33 15 49 24 15 20 2 -1.07 129 0 0 14 51 29 11 46 33.8 31 166 -25 14 59 32 14 43 28 15 6 1 14 37 2 -1.07 130 0 0 14 9 43 11 46 24.8 32 167 -26 14 17 39 14 1 48 14 24 3 13 55 27 -1.07 131 0 0 13 29 21 11 46 15.7 33 168 -27 13 37 11 13 21 32 13 43 30 13 15 16 -1.07 132 0 0 12 50 21 11 46 6.5 33 168 -28 12 58 6 12 42 38 13 4 20 12 36 26 -1.07 133 0 0 12 12 42 11 45 57.1 34 169 -30 12 20 22 12 5 4 12 26 32 11 58 57 -1.07 134 0 0 11 36 24 11 45 47.7 35 170 -31 11 43 58 11 28 51 11 50 4 11 22 47 -1.07 135 0 0 11 1 23 11 45 38.1 36 171 -32 11 8 52 10 53 55 11 14 54 10 47 55 -1.07 136 0 0 10 27 40 11 45 28.5 36 172 -33 10 35 4 10 20 16 10 41 3 10 14 20 -1.07 137 0 0 9 55 12 11 45 18.8 37 172 -34 10 2 33 9 47 53 10 8 28 9 42 1 -1.07 138 0 0 9 24 0 11 45 9.0 38 173 -35 9 31 16 9 16 45 9 37 8 9 10 56 -1.06 139 0 0 8 54 1 11 44 59.2 38 174 -36 9 1 13 8 46 50 9 7 2 8 41 4 -1.06 140 0 0 8 25 15 11 44 49.3 39 175 -37 8 32 24 8 18 8 8 38 9 8 12 25 -1.06 141 0 0 7 57 41 11 44 39.4 39 176 -38 8 4 46 7 50 37 8 10 28 7 44 57 -1.06 142 0 0 7 31 17 11 44 29.5 40 177 -39 7 38 19 7 24 16 7 43 58 7 18 39 -1.06 143 0 0 7 6 3 11 44 19.5 40 178 -40 7 13 1 6 59 6 7 18 39 6 53 31 -1.06 144 0 0 6 41 58 11 44 9.5 41 178 -41 6 48 53 6 35 3 6 54 28 6 29 31 -1.06 145 0 0 6 19 1 11 43 59.4 41 179 -42 6 25 53 6 12 9 6 31 26 6 6 39 -1.06 146 0 0 5 57 11 11 43 49.4 42 180 -43 6 4 1 5 50 22 6 9 31 5 44 54 -1.06 147 0 0 5 36 28 11 43 39.3 42 181 -44 5 43 15 5 29 41 5 48 43 5 24 15 -1.06 148 0 0 5 16 50 11 43 29.2 42 182 -45 5 23 35 5 10 6 5 29 1 5 4 41 -1.06 149 0 0 4 58 17 11 43 19.2 42 183 -46 5 5 0 4 51 35 5 10 25 4 46 13 -1.06 150 0 0 4 40 49 11 43 9.1 43 184 -47 4 47 30 4 34 9 4 52 53 4 28 48 -1.06 151 0 0 4 24 25 11 42 59.0 43 185 -48 4 31 4 4 17 47 4 36 25 4 12 28 -1.06 152 0 0 4 9 4 11 42 49.0 43 186 -49 4 15 41 4 2 28 4 21 1 3 57 10 -1.06 153 0 0 3 54 46 11 42 39.0 43 187 -50 4 1 22 3 48 11 4 6 40 3 42 55 -1.06 154 0 0 3 41 30 11 42 28.9 43 188 -51 3 48 4 3 34 57 3 53 21 3 29 41 -1.06 155 0 0 3 29 16 11 42 18.9 43 189 -52 3 35 49 3 22 44 3 41 5 3 17 30 -1.06 156 0 0 3 18 4 11 42 9.0 43 190 -52 3 24 35 3 11 33 3 29 50 3 6 20 -1.06 157 0 0 3 7 52 11 41 59.0 43 191 -53 3 14 22 3 1 23 3 19 37 2 56 10 -1.06 158 0 0 2 58 42 11 41 49.1 43 192 -54 3 5 11 2 52 13 3 10 24 2 47 1 -1.06 159 0 0 2 50 31 11 41 39.2 43 193 -55 2 57 0 2 44 4 3 2 12 2 38 53 -1.06 160 0 0 2 43 21 11 41 29.4 43 194 -56 2 49 49 2 36 55 2 55 1 2 31 44 -1.06 161 0 0 2 37 11 11 41 19.5 43 195 -56 2 43 38 2 30 45 2 48 50 2 25 36 -1.06 162 0 0 2 32 1 11 41 9.8 43 196 -57 2 38 28 2 25 36 2 43 39 2 20 26 -1.06 163 0 0 2 27 51 11 41 0.1 43 197 -58 2 34 17 2 21 26 2 39 28 2 16 17 -1.06 164 0 0 2 24 40 11 40 50.4 42 198 -59 2 31 6 2 18 15 2 36 16 2 13 6 -1.06 165 0 0 2 22 29 11 40 40.8 42 198 -59 2 28 54 2 16 4 2 34 4 2 10 55 -1.06 166 0 0 2 21 17 11 40 31.2 42 199 -60 2 27 42 2 14 52 2 32 52 2 9 44 -1.06 167 0 0 2 21 4 11 40 21.7 41 200 -61 2 27 29 2 14 40 2 32 40 2 9 31 -1.07 168 0 0 2 21 51 11 40 12.2 41 201 -61 2 28 17 2 15 27 2 33 27 2 10 18 -1.07 169 0 0 2 23 38 11 40 2.8 41 202 -62 2 30 3 2 17 13 2 35 14 2 12 4 -1.07 170 0 0 2 26 24 11 39 53.5 40 203 -62 2 32 50 2 19 59 2 38 1 2 14 49 -1.07 171 0 0 2 30 10 11 39 44.3 40 203 -63 2 36 37 2 23 44 2 41 48 2 18 35 -1.07 172 0 0 2 34 56 11 39 35.1 39 204 -63 2 41 23 2 28 30 2 46 35 2 23 20 -1.07 173 0 0 2 40 42 11 39 26.0 39 205 -64 2 47 10 2 34 15 2 52 23 2 29 5 -1.07 174 0 0 2 47 29 11 39 16.9 38 205 -64 2 53 58 2 41 1 2 59 11 2 35 50 -1.07 175 0 0 2 55 17 11 39 8.0 38 206 -64 3 1 47 2 48 48 3 7 0 2 43 36 -1.07 176 0 0 3 4 6 11 38 59.1 37 207 -65 3 10 36 2 57 36 3 15 51 2 52 23 -1.07 177 0 0 3 13 56 11 38 50.3 37 207 -65 3 20 28 3 7 25 3 25 44 3 2 11 -1.07 178 0 0 3 24 48 11 38 41.7 36 208 -65 3 31 22 3 18 16 3 36 38 3 13 1 -1.07 179 0 0 3 36 43 11 38 33.1 36 209 -65 3 43 18 3 30 9 3 48 36 3 24 53 -1.08 180 0 0 3 49 40 11 38 24.6 35 209 -65 3 56 17 3 43 5 4 1 36 3 37 47 -1.08 -179 0 0 4 3 41 11 38 16.2 34 210 -65 4 10 19 3 57 4 4 15 40 3 51 45 -1.08 -178 0 0 4 18 46 11 38 7.9 33 210 -65 4 25 26 4 12 7 4 30 48 4 6 47 -1.08 -177 0 0 4 34 56 11 37 59.8 33 211 -65 4 41 38 4 28 15 4 47 2 4 22 53 -1.08 -176 0 0 4 52 11 11 37 51.7 32 211 -65 4 58 55 4 45 27 5 4 20 4 40 4 -1.08 -175 0 0 5 10 32 11 37 43.8 31 212 -65 5 17 18 5 3 46 5 22 45 4 58 21 -1.08 -174 0 0 5 29 59 11 37 36.1 30 212 -65 5 36 48 5 23 11 5 42 18 5 17 44 -1.08 -173 0 0 5 50 34 11 37 28.4 30 213 -64 5 57 26 5 43 44 6 2 58 5 38 14 -1.09 -172 0 0 6 12 18 11 37 20.9 29 213 -64 6 19 12 6 5 25 6 24 46 5 59 53 -1.09 -171 0 0 6 35 11 11 37 13.6 28 214 -63 6 42 8 6 28 15 6 47 44 6 22 41 -1.09 -170 0 0 6 59 14 11 37 6.4 27 214 -63 7 6 15 6 52 15 7 11 53 6 46 38 -1.09 -169 0 0 7 24 28 11 36 59.3 26 215 -62 7 31 32 7 17 26 7 37 14 7 11 46 -1.09 -168 0 0 7 50 55 11 36 52.5 25 215 -62 7 58 2 7 43 49 8 3 47 7 38 7 -1.09 -167 0 0 8 18 35 11 36 45.8 24 215 -61 8 25 46 8 11 25 8 31 33 8 5 40 -1.10 -166 0 0 8 47 29 11 36 39.3 23 216 -61 8 54 44 8 40 16 9 0 35 8 34 28 -1.10 -165 0 0 9 17 40 11 36 33.0 22 216 -60 9 24 59 9 10 22 9 30 53 9 4 30 -1.10 -164 0 0 9 49 7 11 36 26.9 21 216 -59 9 56 30 9 41 44 10 2 28 9 35 50 -1.10 -163 0 0 10 21 52 11 36 21.0 20 217 -58 10 29 20 10 14 25 10 35 22 10 8 27 -1.10 -162 0 0 10 55 57 11 36 15.3 19 217 -58 11 3 30 10 48 25 11 9 36 10 42 23 -1.11 -161 0 0 11 31 23 11 36 9.9 18 217 -57 11 39 2 11 23 46 11 45 11 11 17 40 -1.11 -160 0 0 12 8 12 11 36 4.7 17 218 -56 12 15 56 12 0 30 12 22 9 11 54 19 -1.11 -159 0 0 12 46 25 11 35 59.8 16 218 -55 12 54 14 12 38 37 13 0 33 12 32 21 -1.12 -158 0 0 13 26 3 11 35 55.1 15 218 -54 13 33 58 13 18 9 13 40 22 13 11 49 -1.12 -157 0 0 14 7 9 11 35 50.7 14 219 -53 14 15 10 13 59 8 14 21 39 13 52 43 -1.12 -156 0 0 14 49 43 11 35 46.6 13 219 -52 14 57 52 14 41 36 15 4 26 14 35 6 -1.13 -155 0 0 15 33 49 11 35 42.8 12 219 -51 15 42 4 15 25 35 15 48 44 15 18 58 -1.13 -154 0 0 16 19 27 11 35 39.3 11 220 -50 16 27 50 16 11 5 16 34 36 16 4 23 -1.14 -153 0 0 17 6 40 11 35 36.2 9 220 -49 17 15 11 16 58 10 17 22 3 16 51 22 -1.14 -152 0 0 17 55 29 11 35 33.4 8 220 -47 18 4 9 17 46 51 18 11 8 17 39 56 -1.15 -151 0 0 18 45 57 11 35 31.0 7 221 -46 18 54 46 18 37 10 19 1 52 18 30 8 -1.16 -150 0 0 19 38 6 11 35 29.0 6 221 -45 19 47 4 19 29 10 19 54 18 19 22 0 -1.18 -149 0 0 20 31 58 11 35 27.3 4 221 -44 20 41 6 20 22 52 20 48 28 20 15 35 -1.20 -148 0 0 21 27 35 11 35 26.1 3 222 -42 21 36 54 21 18 19 21 44 25 21 10 53 -1.25 -147 0 0 22 25 0 11 35 25.4 2 222 -41 22 34 30 22 15 33 22 42 10 22 7 58 -1.38 -146 0 0 23 24 15 11 35 25.1 0 222 -40 23 33 57 23 14 36 23 41 47 23 6 52 -2.60 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 238-125054 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 31 25.2521 DE: -42 32 22.631 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 31 25.2521 DE: -42 32 22.631 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * B mag [mag]: 12.3 * 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]: 2.69640 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", 104.995° remarks: * orbital elements for (13023)1988 XT1 : Mean anomaly = 253.5883584613 deg Arg. of pericenter = 9.8711439121 deg Long. of node = 41.0959692974 deg Inclination = 17.9242793332 deg Eccentricity = 0.3003093674 Semimajor axis = 3.0563780424 AU Perihelion dist = 2.1385190859 AU Mag: H = 12.99, G = 0.15 Epoch of elements : MJD 60514.48757950 TDT (2024 Jul 23.4876) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#452023Apr25,1.49,2024,7,23,11.701890,0.175943,0.706351,-5.954373,1.483221,0.003414,0.001344,0.000001,0.000000 146.0664,-42.5598,6.11,19.91,False UCAC4 238-125054,17.52368116,-42.5396196,12.26,11.20,10.63,0.1,0,,17.55330895,-42.5598209,7.36,7.48,0,0,0 13023,1988 XT1,18.56,16.206,2.6964,0,0,-1.757,4.84,,1.6,0 0,253.4984,2024,7,23,9.8711,41.0960,17.9243,0.30031,3.05638,2.13852,12.99,5.0,0.15 1.402,0.0200,0.0033,105,0.0033,Known errors,0.73,0,-1,-1 20240723_125054,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org