IOTA/IOTA-ES occultation update for (2326) Tololo / TYC 5240-00115-1 event on 2023 Aug 16, 10:40 UT Visible from W Canada, NE Australia Summary ------- On 2023 Aug 16 UT, the 42 km diameter asteroid (2326) Tololo will occult a 10.8 mag star in the constellation Aquarius for observers along a path across W Canada, NE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.10 mag to 14.84 mag (the magnitude of the asteroid) for at most 3.720 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: 74 * date and approx. time of event: 2023 Aug 16, 10:32 - 2023 Aug 16, 10:49 * geocentric midpoint of event [JD]: 2460172.94497063 * magnitude of target star: 10.77 * magnitude drop [mag]: 4.10 * estimated maximum duration [s]: 3.720 * Moon: 0 % sunlit, 162° distance * Sun: 162° distance * rough path description: W Canada, NE Australia The occultation path -------------------- * approximate projected width [km]: 49 * 1 sigma uncertainty interval [path widths]: +/- 0.77 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.034, +/- 0.018) * 1 sigma uncertainty ellipse (major, minor, PA): (0.034", 0.018", 83°) * approx speed of asteroid's shadow [km/s]: 11.2820 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5240-00115-1 by 2326 Tololo on 2023 Aug 16 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 124 0 0 -15 54 9 10 48 50.0 0 97 -18 -15 40 45 -16 7 31 -15 20 3 -16 28 3 .... 125 0 0 -16 0 31 10 48 49.8 1 97 -19 -15 47 9 -16 13 52 -15 26 29 -16 34 21 -0.37 126 0 0 -16 6 1 10 48 49.4 2 96 -20 -15 52 40 -16 19 20 -15 32 2 -16 39 47 -0.47 127 0 0 -16 10 38 10 48 48.9 3 96 -21 -15 57 18 -16 23 56 -15 36 43 -16 44 22 -0.51 128 0 0 -16 14 23 10 48 48.2 4 96 -22 -16 1 4 -16 27 40 -15 40 30 -16 48 4 -0.53 129 0 0 -16 17 16 10 48 47.3 5 96 -23 -16 3 58 -16 30 33 -15 43 26 -16 50 55 -0.54 130 0 0 -16 19 18 10 48 46.2 6 95 -24 -16 6 1 -16 32 34 -15 45 29 -16 52 55 -0.55 131 0 0 -16 20 28 10 48 44.9 7 95 -25 -16 7 11 -16 33 43 -15 46 40 -16 54 4 -0.56 132 0 0 -16 20 47 10 48 43.4 8 95 -26 -16 7 30 -16 34 2 -15 47 0 -16 54 22 -0.56 133 0 0 -16 20 15 10 48 41.8 9 94 -27 -16 6 58 -16 33 29 -15 46 28 -16 53 50 -0.57 134 0 0 -16 18 51 10 48 40.0 10 94 -27 -16 5 35 -16 32 6 -15 45 4 -16 52 26 -0.57 135 0 0 -16 16 37 10 48 38.0 11 94 -28 -16 3 20 -16 29 52 -15 42 49 -16 50 12 -0.57 136 0 0 -16 13 31 10 48 35.8 12 94 -29 -16 0 14 -16 26 47 -15 39 43 -16 47 8 -0.58 137 0 0 -16 9 35 10 48 33.5 13 93 -30 -15 56 17 -16 22 51 -15 35 45 -16 43 13 -0.58 138 0 0 -16 4 48 10 48 31.0 14 93 -31 -15 51 29 -16 18 4 -15 30 56 -16 38 27 -0.58 139 0 0 -15 59 9 10 48 28.3 15 93 -32 -15 45 50 -16 12 27 -15 25 15 -16 32 51 -0.58 140 0 0 -15 52 40 10 48 25.4 16 93 -33 -15 39 19 -16 5 58 -15 18 42 -16 26 25 -0.58 141 0 0 -15 45 19 10 48 22.4 17 93 -34 -15 31 57 -15 58 39 -15 11 18 -16 19 7 -0.58 142 0 0 -15 37 7 10 48 19.1 18 92 -35 -15 23 43 -15 50 28 -15 3 3 -16 10 59 -0.58 143 0 0 -15 28 3 10 48 15.7 18 92 -36 -15 14 38 -15 41 26 -14 53 55 -16 1 59 -0.58 144 0 0 -15 18 8 10 48 12.1 19 92 -37 -15 4 41 -15 31 33 -14 43 55 -15 52 8 -0.58 145 0 0 -15 7 21 10 48 8.3 20 92 -38 -14 53 52 -15 20 47 -14 33 3 -15 41 26 -0.58 146 0 0 -14 55 41 10 48 4.4 21 92 -39 -14 42 10 -15 9 10 -14 21 18 -15 29 52 -0.58 147 0 0 -14 43 9 10 48 0.2 22 91 -40 -14 29 36 -14 56 40 -14 8 40 -15 17 26 -0.58 148 0 0 -14 29 45 10 47 55.9 23 91 -41 -14 16 9 -14 43 18 -13 55 9 -15 4 8 -0.58 149 0 0 -14 15 27 10 47 51.4 24 91 -41 -14 1 49 -14 29 4 -13 40 45 -14 49 57 -0.58 150 0 0 -14 0 16 10 47 46.7 25 91 -42 -13 46 35 -14 13 56 -13 25 27 -14 34 53 -0.58 151 0 0 -13 44 12 10 47 41.8 26 91 -43 -13 30 28 -13 57 54 -13 9 15 -14 18 56 -0.58 152 0 0 -13 27 14 10 47 36.7 27 91 -44 -13 13 26 -13 40 59 -12 52 8 -14 2 6 -0.58 153 0 0 -13 9 21 10 47 31.4 28 91 -45 -12 55 30 -13 23 9 -12 34 6 -13 44 21 -0.58 154 0 0 -12 50 33 10 47 25.9 29 91 -46 -12 36 38 -13 4 25 -12 15 9 -13 25 43 -0.58 155 0 0 -12 30 50 10 47 20.2 30 91 -47 -12 16 52 -12 44 46 -11 55 17 -13 6 9 -0.58 156 0 0 -12 10 11 10 47 14.4 31 91 -48 -11 56 9 -12 24 11 -11 34 28 -12 45 40 -0.58 157 0 0 -11 48 36 10 47 8.3 32 91 -49 -11 34 30 -12 2 40 -11 12 42 -12 24 15 -0.58 158 0 0 -11 26 4 10 47 2.0 33 91 -50 -11 11 53 -11 40 12 -10 49 59 -12 1 54 -0.58 159 0 0 -11 2 35 10 46 55.5 34 91 -51 -10 48 20 -11 16 48 -10 26 19 -11 38 37 -0.58 160 0 0 -10 38 8 10 46 48.9 35 91 -51 -10 23 48 -10 52 26 -10 1 40 -11 14 22 -0.58 161 0 0 -10 12 43 10 46 42.0 36 91 -52 - 9 58 19 -10 27 5 - 9 36 2 -10 49 9 -0.58 162 0 0 - 9 46 19 10 46 34.9 36 91 -53 - 9 31 50 -10 0 47 - 9 9 25 -10 22 58 -0.58 163 0 0 - 9 18 56 10 46 27.6 37 92 -54 - 9 4 21 - 9 33 29 - 8 41 49 - 9 55 49 -0.58 164 0 0 - 8 50 34 10 46 20.0 38 92 -55 - 8 35 53 - 9 5 12 - 8 13 12 - 9 27 40 -0.58 165 0 0 - 8 21 10 10 46 12.3 39 92 -56 - 8 6 24 - 8 35 54 - 7 43 34 - 8 58 31 -0.58 166 0 0 - 7 50 46 10 46 4.3 40 92 -57 - 7 35 54 - 8 5 36 - 7 12 54 - 8 28 21 -0.58 167 0 0 - 7 19 20 10 45 56.2 41 93 -57 - 7 4 22 - 7 34 16 - 6 41 13 - 7 57 11 -0.58 168 0 0 - 6 46 52 10 45 47.8 42 93 -58 - 6 31 47 - 7 1 55 - 6 8 29 - 7 24 59 -0.58 169 0 0 - 6 13 22 10 45 39.2 43 94 -59 - 5 58 10 - 6 28 31 - 5 34 41 - 6 51 45 -0.58 170 0 0 - 5 38 48 10 45 30.3 44 94 -60 - 5 23 30 - 5 54 4 - 4 59 50 - 6 17 29 -0.58 171 0 0 - 5 3 11 10 45 21.3 45 95 -60 - 4 47 46 - 5 18 34 - 4 23 55 - 5 42 9 -0.58 172 0 0 - 4 26 30 10 45 12.0 46 95 -61 - 4 10 57 - 4 41 59 - 3 46 55 - 5 5 46 -0.58 173 0 0 - 3 48 43 10 45 2.5 47 96 -62 - 3 33 3 - 4 4 21 - 3 8 49 - 4 28 18 -0.58 174 0 0 - 3 9 52 10 44 52.8 48 97 -62 - 2 54 4 - 3 25 37 - 2 29 38 - 3 49 46 -0.58 175 0 0 - 2 29 55 10 44 42.9 48 97 -63 - 2 13 59 - 2 45 48 - 1 49 21 - 3 10 9 -0.58 176 0 0 - 1 48 52 10 44 32.7 49 98 -63 - 1 32 48 - 2 4 53 - 1 7 57 - 2 29 27 -0.58 177 0 0 - 1 6 43 10 44 22.3 50 99 -64 - 0 50 30 - 1 22 52 - 0 25 26 - 1 47 39 -0.59 178 0 0 - 0 23 27 10 44 11.7 51 100 -64 - 0 7 5 - 0 39 45 0 18 13 - 1 4 44 -0.59 179 0 0 0 20 56 10 44 0.9 52 101 -65 0 37 27 0 4 29 1 2 59 - 0 20 44 -0.59 -180 0 0 1 6 27 10 43 49.9 52 103 -65 1 23 6 0 49 51 1 48 53 0 24 24 -0.59 -179 0 0 1 53 5 10 43 38.6 53 104 -65 2 9 54 1 36 19 2 35 55 1 10 38 -0.59 -178 0 0 2 40 50 10 43 27.2 54 105 -66 2 57 49 2 23 55 3 24 5 1 57 59 -0.59 -177 0 0 3 29 43 10 43 15.5 55 107 -66 3 46 52 3 12 38 4 13 24 2 46 27 -0.59 -176 0 0 4 19 44 10 43 3.7 55 108 -66 4 37 3 4 2 29 5 3 51 3 36 3 -0.59 -175 0 0 5 10 52 10 42 51.6 56 110 -66 5 28 22 4 53 27 5 55 26 4 26 45 -0.59 -174 0 0 6 3 8 10 42 39.4 56 112 -66 6 20 48 5 45 32 6 48 10 5 18 33 -0.59 -173 0 0 6 56 30 10 42 26.9 57 114 -65 7 14 22 6 38 43 7 42 1 6 11 28 -0.59 -172 0 0 7 50 59 10 42 14.3 57 116 -65 8 9 2 7 33 1 8 36 59 7 5 30 -0.59 -171 0 0 8 46 35 10 42 1.6 58 118 -65 9 4 49 8 28 25 9 33 4 8 0 36 -0.59 -170 0 0 9 43 16 10 41 48.6 58 120 -64 10 1 42 9 24 54 10 30 15 8 56 47 -0.59 -169 0 0 10 41 1 10 41 35.6 59 122 -64 10 59 39 10 22 28 11 28 32 9 54 3 -0.60 -168 0 0 11 39 50 10 41 22.3 59 125 -63 11 58 41 11 21 5 12 27 53 10 52 21 -0.60 -167 0 0 12 39 42 10 41 9.0 59 127 -63 12 58 46 12 20 44 13 28 18 11 51 42 -0.60 -166 0 0 13 40 36 10 40 55.5 59 130 -62 13 59 52 13 21 25 14 29 44 12 52 4 -0.60 -165 0 0 14 42 29 10 40 42.0 59 132 -61 15 1 59 14 23 5 15 32 12 13 53 25 -0.60 -164 0 0 15 45 21 10 40 28.3 59 135 -60 16 5 4 15 25 44 16 35 38 14 55 44 -0.60 -163 0 0 16 49 10 10 40 14.6 59 137 -59 17 9 6 16 29 20 17 40 2 15 58 59 -0.60 -162 0 0 17 53 53 10 40 0.9 59 140 -58 18 14 3 17 33 49 18 45 20 17 3 8 -0.60 -161 0 0 18 59 29 10 39 47.0 58 142 -57 19 19 53 18 39 11 19 51 32 18 8 9 -0.60 -160 0 0 20 5 55 10 39 33.2 58 145 -56 20 26 33 19 45 23 20 58 35 19 14 0 -0.61 -159 0 0 21 13 8 10 39 19.4 58 147 -55 21 34 1 20 52 23 22 6 25 20 20 39 -0.61 -158 0 0 22 21 6 10 39 5.6 57 150 -54 22 42 13 22 0 6 23 15 0 21 28 1 -0.61 -157 0 0 23 29 46 10 38 51.8 56 152 -53 23 51 7 23 8 32 24 24 17 22 36 5 -0.61 -156 0 0 24 39 3 10 38 38.1 56 155 -52 25 0 40 24 17 35 25 34 13 23 44 47 -0.61 -155 0 0 25 48 56 10 38 24.5 55 157 -50 26 10 47 25 27 13 26 44 43 24 54 3 -0.61 -154 0 0 26 59 19 10 38 10.9 54 159 -49 27 21 24 26 37 22 27 55 44 26 3 50 -0.61 -153 0 0 28 10 8 10 37 57.5 53 161 -48 28 32 29 27 47 57 29 7 11 27 14 4 -0.61 -152 0 0 29 21 20 10 37 44.2 53 163 -47 29 43 55 28 58 55 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41 50 10 35 14.1 39 183 -29 45 6 55 44 16 57 45 46 0 43 39 3 -0.63 -138 0 1 45 49 0 10 35 4.9 37 184 -28 46 14 11 45 24 1 46 53 26 44 45 58 -0.63 -137 0 1 46 55 10 10 34 56.0 36 185 -27 47 20 27 46 30 7 47 59 50 45 51 56 -0.63 -136 0 1 48 0 17 10 34 47.5 35 186 -25 48 25 37 47 35 9 49 5 7 46 56 53 -0.63 -135 0 1 49 4 15 10 34 39.4 34 187 -24 49 29 38 48 39 5 50 9 12 48 0 44 -0.63 -134 0 1 50 6 59 10 34 31.7 33 188 -23 50 32 24 49 41 48 51 12 0 49 3 25 -0.63 -133 0 1 51 8 27 10 34 24.3 32 189 -22 51 33 53 50 43 15 52 13 29 50 4 52 -0.63 -132 0 1 52 8 34 10 34 17.4 31 190 -21 52 33 59 51 43 23 53 13 33 51 5 2 -0.63 -131 0 1 53 7 18 10 34 10.8 30 191 -20 53 32 40 52 42 9 54 12 11 52 3 50 -0.63 -130 0 1 54 4 35 10 34 4.5 29 192 -18 54 29 53 53 39 29 55 9 19 53 1 16 -0.63 -129 0 1 55 0 23 10 33 58.6 28 193 -17 55 25 37 54 35 22 56 4 55 53 57 15 -0.63 -128 0 1 55 54 40 10 33 53.1 27 194 -16 56 19 49 55 29 45 56 58 58 54 51 47 -0.63 -127 0 1 56 47 26 10 33 47.9 26 195 -15 57 12 27 56 22 38 57 51 25 55 44 49 -0.63 -126 0 1 57 38 39 10 33 43.0 25 196 -14 58 3 32 57 13 58 58 42 17 56 36 21 -0.63 -125 0 1 58 28 19 10 33 38.4 24 197 -13 58 53 3 58 3 46 59 31 34 57 26 23 -0.63 -124 0 1 59 16 25 10 33 34.1 23 198 -12 59 40 59 58 52 2 60 19 14 58 14 53 -0.63 -123 0 1 60 2 58 10 33 30.1 22 199 -11 60 27 21 59 38 46 61 5 18 59 1 52 -0.63 -122 0 1 60 47 58 10 33 26.4 21 200 -10 61 12 10 60 23 57 61 49 49 59 47 21 -0.63 -121 0 1 61 31 26 10 33 22.9 20 201 -10 61 55 26 61 7 38 62 32 45 60 31 19 -0.63 -120 0 1 62 13 24 10 33 19.6 19 202 -9 62 37 11 61 49 49 63 14 10 61 13 49 -0.63 -119 0 1 62 53 54 10 33 16.6 18 203 -8 63 17 26 62 30 31 63 54 4 61 54 51 -0.62 -118 0 1 63 32 55 10 33 13.8 18 204 -7 63 56 14 63 9 47 64 32 29 62 34 27 -0.62 -117 0 1 64 10 32 10 33 11.2 17 205 -6 64 33 36 63 47 37 65 9 28 63 12 39 -0.62 -116 0 1 64 46 45 10 33 8.8 16 206 -6 65 9 34 64 24 5 65 45 3 63 49 28 -0.62 -115 0 1 65 21 37 10 33 6.5 16 206 -5 65 44 11 64 59 11 66 19 15 64 24 57 -0.62 -114 0 1 65 55 9 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52 -0.60 - 88 0 1 74 47 43 10 32 43.2 3 232 8 75 4 12 74 31 19 75 29 41 74 6 8 -0.60 - 87 0 1 74 59 7 10 32 43.0 2 233 8 75 15 25 74 42 51 75 40 39 74 17 56 -0.60 - 86 0 1 75 10 3 10 32 42.9 2 234 9 75 26 12 74 53 57 75 51 11 74 29 15 -0.59 - 85 0 1 75 20 33 10 32 42.8 2 235 9 75 36 33 75 4 36 76 1 18 74 40 8 -0.59 - 84 0 1 75 30 38 10 32 42.7 1 236 9 75 46 29 75 14 50 76 11 0 74 50 35 -0.59 - 83 0 1 75 40 18 10 32 42.6 1 237 9 75 56 1 75 24 39 76 20 19 75 0 37 -0.58 - 82 0 1 75 49 36 10 32 42.6 1 238 10 76 5 10 75 34 4 76 29 15 75 10 15 -0.57 - 81 0 1 75 58 30 10 32 42.5 0 239 10 76 13 57 75 43 6 76 37 49 75 19 29 -0.54 - 80 0 1 76 7 3 10 32 42.5 0 240 10 76 22 22 75 51 47 .. .. .. 75 28 21 -0.46 - 79 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 76 0 6 .. .. .. 75 36 52 .... Uncertainty in time = +/- 4 secs Prediction of 2023 Aug 6.7 Data for the target star ------------------------ * name: TYC 5240-00115-1 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 47 55.3641 DE: -06 55 01.369 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 47 55.3642 DE: -06 55 01.369 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2326) Tololo asteroid class: approx. diameter [km]: 42 approx. diameter ["]: 0.033 distance from Earth [AU]: 1.73650 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#61 date of fit: 2023 Jul 30 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): 0.034", 0.018", 82.602° remarks: * orbital elements for (2326)Tololo : Mean anomaly = 296.6200930914 deg Arg. of pericenter = 259.4128091748 deg Long. of node = 155.8110496034 deg Inclination = 15.1495892964 deg Eccentricity = 0.1596497922 Semimajor axis = 2.8589474125 AU Perihelion dist = 2.4025170522 AU Mag: H = 10.97, G = 0.15 Epoch of elements : MJD 60172.44486111 TDT (2023 Aug 16.4449) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Jul30,3.72,2023,8,16,10.679295,-0.375165,0.351649,-4.357464,-4.643559,-0.001555,-0.000707,0.000001,0.000001 -142.4679,-6.7913,20.91,13.74,False TYC 5240-00115-1,22.79871225,-6.9170470,0.00,10.77,0.00,0.0,0,,22.81945069,-6.7912578,4.09,0.00,0,0,0 2326,Tololo,14.84,42.000,1.7365,0,0,-1.482,-23.52,,1.8,0 0,296.5294,2023,8,16,259.4128,155.8110,15.1496,0.15965,2.85895,2.40252,10.97,5.0,0.15 1.770,0.0340,0.0180,83,0.0385,Known errors,-1.00,0,-1,-1 20230816_0115-1,60162.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 06, 16:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org