IOTA/IOTA-ES occultation update for (4179) Toutatis / UCAC4 336-158302 event on 2024 Jul 16, 05:16 UT Visible from Summary ------- On 2024 Jul 16 UT, the 2.876 km diameter asteroid (4179) Toutatis will occult a 13.3 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.80 mag to 18.05 mag (the magnitude of the asteroid) for at most 0.220 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: 95 * date and approx. time of event: 2024 Jul 16, 05:11 - 2024 Jul 16, 05:20 * geocentric midpoint of event [JD]: 2460507.71946758 * magnitude of target star: 13.26 * magnitude drop [mag]: 4.80 * estimated maximum duration [s]: 0.220 * Moon: 71 % sunlit, 49° distance * Sun: 163° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 6 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 0.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.004, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.004", 0.001", 71°) * approx speed of asteroid's shadow [km/s]: 13.1255 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 336-158302 by 4179 Toutatis on 2024 Jul 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 -154 0 0 51 27 24 5 19 50.6 0 129 8 51 29 33 51 25 16 51 31 24 51 23 26 .... -153 0 0 50 57 37 5 19 50.5 1 130 7 50 59 45 50 55 30 51 1 34 50 53 41 -0.85 -152 0 0 50 28 19 5 19 50.1 2 130 6 50 30 25 50 26 13 50 32 14 50 24 25 -1.30 -151 0 0 49 59 31 5 19 49.6 3 131 6 50 1 36 49 57 26 50 3 23 49 55 39 -1.49 -150 0 0 49 31 13 5 19 48.8 3 132 5 49 33 17 49 29 10 49 35 3 49 27 24 -1.58 -149 0 0 49 3 27 5 19 47.9 4 133 4 49 5 29 49 1 24 49 7 14 48 59 39 -1.64 -148 0 0 48 36 12 5 19 46.8 5 133 3 48 38 13 48 34 11 48 39 58 48 32 27 -1.69 -147 0 0 48 9 30 5 19 45.4 6 134 2 48 11 30 48 7 30 48 13 14 48 5 47 -1.72 -146 0 0 47 43 21 5 19 43.9 7 135 2 47 45 21 47 41 23 47 47 3 47 39 40 -1.74 -145 0 0 47 17 46 5 19 42.2 7 136 1 47 19 44 47 15 48 47 21 26 47 14 7 -1.76 -144 0 0 46 52 45 5 19 40.3 8 137 0 46 54 42 46 50 48 46 56 23 46 49 8 -1.77 -143 0 0 46 28 19 5 19 38.2 9 137 -1 46 30 15 46 26 23 46 31 55 46 24 44 -1.78 -142 0 0 46 4 28 5 19 35.9 10 138 -2 46 6 23 46 2 33 46 8 2 46 0 54 -1.79 -141 0 0 45 41 12 5 19 33.5 10 139 -2 45 43 6 45 39 18 45 44 44 45 37 40 -1.80 -140 0 0 45 18 32 5 19 30.8 11 140 -3 45 20 25 45 16 39 45 22 3 45 15 1 -1.81 -139 0 0 44 56 28 5 19 28.0 12 140 -4 44 58 20 44 54 35 44 59 57 44 52 59 -1.81 -138 0 0 44 35 0 5 19 25.0 13 141 -5 44 36 52 44 33 9 44 38 28 44 31 33 -1.82 -137 0 0 44 14 9 5 19 21.9 13 142 -5 44 16 0 44 12 19 44 17 36 44 10 44 -1.82 -136 0 0 43 53 56 5 19 18.6 14 143 -6 43 55 46 43 52 6 43 57 21 43 50 31 -1.83 -135 0 0 43 34 19 5 19 15.1 15 143 -7 43 36 8 43 32 30 43 37 43 43 30 56 -1.83 -134 0 0 43 15 20 5 19 11.4 15 144 -8 43 17 9 43 13 31 43 18 42 43 11 58 -1.83 -133 0 0 42 56 58 5 19 7.6 16 145 -9 42 58 46 42 55 10 43 0 19 42 53 38 -1.84 -132 0 0 42 39 15 5 19 3.7 17 146 -9 42 41 2 42 37 27 42 42 35 42 35 55 -1.84 -131 0 0 42 22 9 5 18 59.6 17 147 -10 42 23 56 42 20 22 42 25 28 42 18 51 -1.84 -130 0 0 42 5 41 5 18 55.4 18 147 -11 42 7 28 42 3 55 42 8 59 42 2 24 -1.84 -129 0 0 41 49 52 5 18 51.0 19 148 -11 41 51 38 41 48 7 41 53 9 41 46 36 -1.84 -128 0 0 41 34 41 5 18 46.5 19 149 -12 41 36 26 41 32 56 41 37 57 41 31 26 -1.85 -127 0 0 41 20 9 5 18 41.9 20 150 -13 41 21 54 41 18 24 41 23 24 41 16 55 -1.85 -126 0 0 41 6 15 5 18 37.1 20 151 -14 41 7 59 41 4 31 41 9 29 41 3 2 -1.85 -125 0 0 40 53 0 5 18 32.3 21 151 -14 40 54 44 40 51 17 40 56 13 40 49 48 -1.85 -124 0 0 40 40 24 5 18 27.3 21 152 -15 40 42 7 40 38 41 40 43 36 40 37 12 -1.85 -123 0 0 40 28 26 5 18 22.2 22 153 -16 40 30 9 40 26 44 40 31 38 40 25 16 -1.85 -122 0 0 40 17 8 5 18 16.9 22 154 -16 40 18 50 40 15 26 40 20 19 40 13 58 -1.85 -121 0 0 40 6 28 5 18 11.6 23 155 -17 40 8 10 40 4 46 40 9 38 40 3 19 -1.85 -120 0 0 39 56 28 5 18 6.2 23 156 -17 39 58 10 39 54 46 39 59 37 39 53 19 -1.85 -119 0 0 39 47 7 5 18 0.7 24 157 -18 39 48 48 39 45 25 39 50 15 39 43 58 -1.85 -118 0 0 39 38 24 5 17 55.1 24 158 -19 39 40 5 39 36 43 39 41 32 39 35 17 -1.86 -117 0 0 39 30 21 5 17 49.4 25 159 -19 39 32 2 39 28 40 39 33 29 39 27 14 -1.86 -116 0 0 39 22 57 5 17 43.6 25 159 -20 39 24 38 39 21 17 39 26 4 39 19 50 -1.86 -115 0 0 39 16 12 5 17 37.8 25 160 -20 39 17 53 39 14 32 39 19 19 39 13 6 -1.86 -114 0 0 39 10 7 5 17 31.9 26 161 -21 39 11 47 39 8 26 39 13 13 39 7 1 -1.86 -113 0 0 39 4 40 5 17 25.9 26 162 -21 39 6 20 39 3 0 39 7 46 39 1 34 -1.86 -112 0 0 38 59 53 5 17 19.8 26 163 -22 39 1 33 38 58 13 39 2 58 38 56 47 -1.86 -111 0 0 38 55 45 5 17 13.7 27 164 -22 38 57 24 38 54 5 38 58 50 38 52 39 -1.86 -110 0 0 38 52 16 5 17 7.6 27 165 -23 38 53 55 38 50 36 38 55 21 38 49 11 -1.86 -109 0 0 38 49 26 5 17 1.4 27 166 -23 38 51 6 38 47 47 38 52 31 38 46 21 -1.86 -108 0 0 38 47 16 5 16 55.1 27 167 -24 38 48 55 38 45 36 38 50 21 38 44 11 -1.86 -107 0 0 38 45 44 5 16 48.8 28 168 -24 38 47 24 38 44 5 38 48 49 38 42 40 -1.86 -106 0 0 38 44 52 5 16 42.5 28 169 -24 38 46 31 38 43 13 38 47 57 38 41 48 -1.86 -105 0 0 38 44 39 5 16 36.1 28 170 -25 38 46 19 38 43 0 38 47 44 38 41 35 -1.86 -104 0 0 38 45 6 5 16 29.7 28 171 -25 38 46 45 38 43 27 38 48 11 38 42 2 -1.86 -103 0 0 38 46 12 5 16 23.3 28 172 -26 38 47 51 38 44 32 38 49 16 38 43 7 -1.87 -102 0 0 38 47 56 5 16 16.9 28 173 -26 38 49 36 38 46 17 38 51 1 38 44 52 -1.87 -101 0 0 38 50 20 5 16 10.5 28 174 -26 38 51 59 38 48 41 38 53 25 38 47 15 -1.87 -100 0 0 38 53 23 5 16 4.0 28 175 -26 38 55 2 38 51 43 38 56 28 38 50 18 -1.87 - 99 0 0 38 57 5 5 15 57.6 28 176 -27 38 58 44 38 55 25 39 0 10 38 54 0 -1.87 - 98 0 0 39 1 25 5 15 51.1 28 177 -27 39 3 5 38 59 46 39 4 31 38 58 20 -1.87 - 97 0 0 39 6 25 5 15 44.7 28 178 -27 39 8 5 39 4 46 39 9 31 39 3 20 -1.87 - 96 0 0 39 12 4 5 15 38.2 28 179 -27 39 13 45 39 10 24 39 15 11 39 8 58 -1.87 - 95 0 0 39 18 22 5 15 31.8 28 180 -27 39 20 3 39 16 42 39 21 29 39 15 16 -1.87 - 94 0 0 39 25 19 5 15 25.4 28 181 -27 39 27 0 39 23 39 39 28 26 39 22 12 -1.87 - 93 0 0 39 32 55 5 15 19.1 28 182 -28 39 34 35 39 31 14 39 36 2 39 29 47 -1.87 - 92 0 0 39 41 9 5 15 12.7 27 183 -28 39 42 50 39 39 28 39 44 17 39 38 1 -1.88 - 91 0 0 39 50 2 5 15 6.4 27 184 -28 39 51 43 39 48 21 39 53 11 39 46 54 -1.88 - 90 0 0 39 59 34 5 15 0.1 27 185 -28 40 1 16 39 57 52 40 2 43 39 56 25 -1.88 - 89 0 0 40 9 44 5 14 53.9 27 186 -28 40 11 26 40 8 2 40 12 54 40 6 35 -1.88 - 88 0 0 40 20 33 5 14 47.8 27 187 -28 40 22 16 40 18 51 40 23 44 40 17 23 -1.88 - 87 0 0 40 32 1 5 14 41.6 26 188 -28 40 33 44 40 30 18 40 35 12 40 28 50 -1.88 - 86 0 0 40 44 7 5 14 35.6 26 189 -28 40 45 50 40 42 24 40 47 19 40 40 56 -1.88 - 85 0 0 40 56 51 5 14 29.6 26 190 -27 40 58 35 40 55 8 41 0 4 40 53 39 -1.88 - 84 0 0 41 10 14 5 14 23.7 25 191 -27 41 11 58 41 8 30 41 13 28 41 7 1 -1.89 - 83 0 0 41 24 15 5 14 17.8 25 192 -27 41 26 0 41 22 31 41 27 29 41 21 1 -1.89 - 82 0 0 41 38 54 5 14 12.0 24 193 -27 41 40 39 41 37 9 41 42 9 41 35 39 -1.89 - 81 0 0 41 54 11 5 14 6.3 24 194 -27 41 55 56 41 52 25 41 57 27 41 50 55 -1.89 - 80 0 0 42 10 5 5 14 0.7 24 195 -27 42 11 51 42 8 19 42 13 22 42 6 48 -1.89 - 79 0 0 42 26 37 5 13 55.2 23 196 -26 42 28 24 42 24 51 42 29 56 42 23 19 -1.89 - 78 0 0 42 43 47 5 13 49.8 23 197 -26 42 45 34 42 42 0 42 47 7 42 40 28 -1.89 - 77 0 0 43 1 34 5 13 44.5 22 198 -26 43 3 22 42 59 46 43 4 55 42 58 14 -1.90 - 76 0 0 43 19 58 5 13 39.3 22 199 -26 43 21 47 43 18 10 43 23 20 43 16 36 -1.90 - 75 0 0 43 38 59 5 13 34.2 21 200 -25 43 40 48 43 37 10 43 42 22 43 35 36 -1.90 - 74 0 0 43 58 37 5 13 29.2 21 200 -25 44 0 27 43 56 47 44 2 1 43 55 12 -1.90 - 73 0 0 44 18 51 5 13 24.4 20 201 -24 44 20 42 44 17 0 44 22 17 44 15 25 -1.90 - 72 0 0 44 39 41 5 13 19.6 19 202 -24 44 41 33 44 37 50 44 43 9 44 36 14 -1.91 - 71 0 0 45 1 8 5 13 15.0 19 203 -24 45 3 0 44 59 16 45 4 37 44 57 39 -1.91 - 70 0 0 45 23 10 5 13 10.6 18 204 -23 45 25 3 45 21 17 45 26 41 45 19 40 -1.91 - 69 0 0 45 45 48 5 13 6.3 18 205 -23 45 47 42 45 43 54 45 49 20 45 42 16 -1.91 - 68 0 0 46 9 0 5 13 2.1 17 206 -22 46 10 55 46 7 5 46 12 34 46 5 27 -1.91 - 67 0 0 46 32 47 5 12 58.1 16 206 -22 46 34 43 46 30 52 46 36 23 46 29 12 -1.92 - 66 0 0 46 57 9 5 12 54.2 16 207 -21 46 59 5 46 55 12 47 0 46 46 53 32 -1.92 - 65 0 0 47 22 4 5 12 50.5 15 208 -21 47 24 2 47 20 6 47 25 43 47 18 25 -1.92 - 64 0 0 47 47 33 5 12 46.9 14 209 -20 47 49 31 47 45 34 47 51 14 47 43 52 -1.92 - 63 0 0 48 13 34 5 12 43.5 14 210 -20 48 15 34 48 11 34 48 17 17 48 9 52 -1.92 - 62 0 0 48 40 8 5 12 40.3 13 211 -19 48 42 9 48 38 7 48 43 53 48 36 23 -1.93 - 61 0 0 49 7 14 5 12 37.2 12 211 -18 49 9 16 49 5 12 49 11 1 49 3 27 -1.93 - 60 0 0 49 34 50 5 12 34.3 11 212 -18 49 36 54 49 32 47 49 38 40 49 31 2 -1.93 - 59 0 0 50 2 58 5 12 31.6 11 213 -17 50 5 2 50 0 53 50 6 49 49 59 7 -1.94 - 58 0 0 50 31 35 5 12 29.1 10 214 -16 50 33 41 50 29 29 50 35 29 50 27 41 -1.94 - 57 0 0 51 0 41 5 12 26.8 9 215 -16 51 2 48 50 58 34 51 4 37 50 56 45 -1.94 - 56 0 0 51 30 16 5 12 24.6 8 215 -15 51 32 24 51 28 8 51 34 15 51 26 18 -1.95 - 55 0 0 52 0 18 5 12 22.7 8 216 -14 52 2 28 51 58 8 52 4 19 51 56 17 -1.96 - 54 0 0 52 30 47 5 12 20.9 7 217 -14 52 32 58 52 28 36 52 34 51 52 26 44 -1.96 - 53 0 0 53 1 42 5 12 19.3 6 218 -13 53 3 54 52 59 29 53 5 48 52 57 36 -1.97 - 52 0 0 53 33 1 5 12 17.9 5 219 -12 53 35 15 53 30 48 53 37 10 53 28 53 -1.98 - 51 0 0 54 4 45 5 12 16.8 5 220 -12 54 7 0 54 2 29 54 8 57 54 0 33 -1.99 - 50 0 0 54 36 51 5 12 15.8 4 220 -11 54 39 7 54 34 34 54 41 5 54 32 36 -2.01 - 49 0 0 55 9 18 5 12 15.0 3 221 -10 55 11 36 55 7 0 55 13 36 55 5 1 -2.04 - 48 0 0 55 42 6 5 12 14.4 2 222 -9 55 44 26 55 39 46 55 46 26 55 37 46 -2.09 - 47 0 0 56 15 12 5 12 14.0 1 223 -9 56 17 34 56 12 51 56 19 36 56 10 50 -2.19 - 46 0 0 56 48 37 5 12 13.8 1 224 -8 56 51 0 56 46 14 56 53 4 56 44 11 -2.58 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 336-158302 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 30 58.5503 DE: -22 57 55.541 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 30 58.5503 DE: -22 57 55.541 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.300) * V mag [mag]: 13.3 * B mag [mag]: 13.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4179) Toutatis asteroid class: approx. diameter [km]: 3 approx. diameter ["]: 0.003 distance from Earth [AU]: 1.21650 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#627 date of fit: 2023 Jun 16 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): 0.004", 0.001", 70.931° remarks: * orbital elements for (4179)Toutatis : Mean anomaly = 317.1339116918 deg Arg. of pericenter = 277.8725877703 deg Long. of node = 125.3591729239 deg Inclination = 0.4480256039 deg Eccentricity = 0.6247597660 Semimajor axis = 2.5434416848 AU Perihelion dist = 0.9544016530 AU Mag: H = 15.32, G = 0.10 Epoch of elements : MJD 60507.21946784 TDT (2024 Jul 16.2195) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#6272023Jun16,0.22,2024,7,16,5.267222,-0.057887,0.878214,-7.392342,-0.487284,0.001536,0.000064,0.000001,0.000000 -95.4283,-22.9487,102.53,21.28,False UCAC4 336-158302,18.51626398,-22.9654280,13.91,13.26,12.91,0.0,0,,18.54139256,-22.9486665,4.80,4.70,0,0,0 4179,Toutatis,18.05,2.876,1.2165,0,0,-3.868,-3.52,,0.0,0 0,317.0806,2024,7,16,277.8726,125.3592,0.4480,0.62476,2.54344,0.95440,15.32,5.0,0.10 1.430,0.0040,0.0010,71,0.0014,Known errors,1.70,0,-1,-1 20240716_158302,60140.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org