IOTA/IOTA-ES occultation update for (4179) Toutatis / UCAC4 334-181652 event on 2024 Oct 18, 11:12 UT Visible from Summary ------- On 2024 Oct 18 UT, the 2.82777742998332 km diameter asteroid (4179) Toutatis will occult a 13.0 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 5.48 mag to 18.47 mag (the magnitude of the asteroid) for at most 0.160 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: 2024 Oct 18, 11:07 - 2024 Oct 18, 11:18 * geocentric midpoint of event [JD]: 2460601.96733750 * magnitude of target star: 13.00 * magnitude drop [mag]: 5.48 * estimated maximum duration [s]: 0.160 * Moon: 99 % sunlit, 120° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 3 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 0.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.002, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.002", 0.000", 75°) * approx speed of asteroid's shadow [km/s]: 18.1774 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 334-181652 by 4179 Toutatis on 2024 Oct 18 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 - 14 0 0 -23 40 14 11 7 32.7 1 115 64 -23 41 11 -23 39 17 -23 41 29 -23 38 59 .... - 13 0 0 -24 6 31 11 7 32.8 2 115 64 -24 7 28 -24 5 34 -24 7 46 -24 5 16 0.39 - 12 0 0 -24 32 43 11 7 33.1 3 114 65 -24 33 40 -24 31 46 -24 33 58 -24 31 28 0.40 - 11 0 0 -24 58 50 11 7 33.5 4 114 65 -24 59 47 -24 57 53 -25 0 5 -24 57 35 0.40 - 10 0 0 -25 24 51 11 7 34.0 5 113 66 -25 25 48 -25 23 54 -25 26 6 -25 23 36 0.40 - 9 0 0 -25 50 45 11 7 34.6 6 113 66 -25 51 42 -25 49 48 -25 52 0 -25 49 30 0.40 - 8 0 0 -26 16 32 11 7 35.3 7 113 67 -26 17 29 -26 15 35 -26 17 47 -26 15 17 0.41 - 7 0 0 -26 42 11 11 7 36.2 8 112 67 -26 43 8 -26 41 14 -26 43 26 -26 40 56 0.41 - 6 0 0 -27 7 42 11 7 37.1 9 112 67 -27 8 39 -27 6 45 -27 8 57 -27 6 27 0.41 - 5 0 0 -27 33 3 11 7 38.2 10 111 68 -27 34 0 -27 32 6 -27 34 18 -27 31 48 0.41 - 4 0 0 -27 58 15 11 7 39.3 11 111 68 -27 59 12 -27 57 18 -27 59 30 -27 57 0 0.41 - 3 0 0 -28 23 16 11 7 40.6 12 110 68 -28 24 13 -28 22 19 -28 24 31 -28 22 1 0.41 - 2 0 0 -28 48 6 11 7 42.0 13 110 68 -28 49 3 -28 47 10 -28 49 21 -28 46 52 0.41 - 1 0 0 -29 12 45 11 7 43.4 14 109 68 -29 13 42 -29 11 48 -29 14 0 -29 11 30 0.41 0 0 0 -29 37 12 11 7 45.0 15 109 68 -29 38 9 -29 36 15 -29 38 27 -29 35 57 0.41 1 0 0 -30 1 26 11 7 46.6 16 108 68 -30 2 23 -30 0 30 -30 2 41 -30 0 12 0.41 2 0 0 -30 25 27 11 7 48.4 17 108 68 -30 26 24 -30 24 31 -30 26 42 -30 24 13 0.41 3 0 0 -30 49 15 11 7 50.2 17 107 68 -30 50 12 -30 48 19 -30 50 29 -30 48 1 0.41 4 0 0 -31 12 49 11 7 52.2 18 107 68 -31 13 45 -31 11 52 -31 14 3 -31 11 34 0.41 5 0 0 -31 36 8 11 7 54.2 19 106 68 -31 37 4 -31 35 11 -31 37 22 -31 34 54 0.41 6 0 0 -31 59 12 11 7 56.3 20 105 68 -32 0 8 -31 58 16 -32 0 26 -31 57 58 0.41 7 0 0 -32 22 1 11 7 58.5 21 105 67 -32 22 57 -32 21 5 -32 23 15 -32 20 47 0.41 8 0 0 -32 44 34 11 8 0.8 22 104 67 -32 45 30 -32 43 38 -32 45 48 -32 43 20 0.41 9 0 0 -33 6 51 11 8 3.1 23 104 67 -33 7 47 -33 5 55 -33 8 5 -33 5 37 0.41 10 0 0 -33 28 51 11 8 5.6 24 103 66 -33 29 47 -33 27 55 -33 30 5 -33 27 37 0.41 11 0 0 -33 50 35 11 8 8.1 25 102 66 -33 51 31 -33 49 39 -33 51 48 -33 49 21 0.41 12 0 0 -34 12 1 11 8 10.6 26 102 66 -34 12 57 -34 11 5 -34 13 15 -34 10 47 0.41 13 0 0 -34 33 10 11 8 13.3 27 101 65 -34 34 6 -34 32 14 -34 34 23 -34 31 56 0.41 14 0 0 -34 54 1 11 8 16.0 27 100 65 -34 54 56 -34 53 5 -34 55 14 -34 52 47 0.41 15 0 0 -35 14 34 11 8 18.8 28 100 64 -35 15 29 -35 13 38 -35 15 47 -35 13 20 0.41 16 0 0 -35 34 48 11 8 21.6 29 99 64 -35 35 44 -35 33 53 -35 36 1 -35 33 35 0.41 17 0 0 -35 54 44 11 8 24.5 30 98 63 -35 55 39 -35 53 49 -35 55 57 -35 53 31 0.41 18 0 0 -36 14 21 11 8 27.5 31 98 62 -36 15 16 -36 13 26 -36 15 34 -36 13 8 0.41 19 0 0 -36 33 39 11 8 30.5 32 97 62 -36 34 34 -36 32 44 -36 34 52 -36 32 26 0.41 20 0 0 -36 52 38 11 8 33.6 33 96 61 -36 53 33 -36 51 43 -36 53 50 -36 51 25 0.41 21 0 0 -37 11 17 11 8 36.7 33 95 61 -37 12 12 -37 10 22 -37 12 29 -37 10 5 0.41 22 0 0 -37 29 37 11 8 39.9 34 95 60 -37 30 31 -37 28 42 -37 30 49 -37 28 24 0.41 23 0 0 -37 47 36 11 8 43.1 35 94 59 -37 48 31 -37 46 42 -37 48 49 -37 46 24 0.41 24 0 0 -38 5 16 11 8 46.4 36 93 59 -38 6 11 -38 4 22 -38 6 28 -38 4 4 0.41 25 0 0 -38 22 36 11 8 49.7 37 92 58 -38 23 31 -38 21 42 -38 23 48 -38 21 24 0.41 26 0 0 -38 39 36 11 8 53.1 38 91 58 -38 40 30 -38 38 41 -38 40 48 -38 38 24 0.41 27 0 0 -38 56 15 11 8 56.5 38 91 57 -38 57 10 -38 55 21 -38 57 27 -38 55 4 0.41 28 0 0 -39 12 34 11 9 0.0 39 90 56 -39 13 29 -39 11 40 -39 13 46 -39 11 23 0.41 29 0 0 -39 28 33 11 9 3.4 40 89 56 -39 29 27 -39 27 39 -39 29 44 -39 27 22 0.41 30 0 0 -39 44 11 11 9 7.0 41 88 55 -39 45 5 -39 43 17 -39 45 22 -39 43 0 0.41 31 0 0 -39 59 29 11 9 10.5 41 87 54 -40 0 23 -39 58 35 -40 0 40 -39 58 18 0.41 32 0 0 -40 14 25 11 9 14.1 42 86 53 -40 15 19 -40 13 32 -40 15 36 -40 13 15 0.41 33 0 0 -40 29 2 11 9 17.8 43 85 53 -40 29 55 -40 28 8 -40 30 12 -40 27 51 0.41 34 0 0 -40 43 17 11 9 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26 36 -44 28 36 -44 26 20 0.41 97 0 0 -44 20 37 11 13 45.3 66 329 7 -44 21 28 -44 19 45 -44 21 45 -44 19 28 0.41 98 0 0 -44 13 25 11 13 49.8 66 327 7 -44 14 17 -44 12 33 -44 14 33 -44 12 17 0.41 99 0 0 -44 5 53 11 13 54.3 66 325 6 -44 6 45 -44 5 1 -44 7 2 -44 4 45 0.41 100 0 0 -43 58 1 11 13 58.8 66 323 5 -43 58 53 -43 57 9 -43 59 9 -43 56 52 0.41 101 0 0 -43 49 48 11 14 3.3 65 320 4 -43 50 40 -43 48 56 -43 50 57 -43 48 40 0.41 102 0 0 -43 41 15 11 14 7.8 65 318 4 -43 42 7 -43 40 23 -43 42 24 -43 40 6 0.41 103 0 0 -43 32 21 11 14 12.3 64 316 3 -43 33 13 -43 31 29 -43 33 30 -43 31 12 0.41 104 0 0 -43 23 7 11 14 16.8 64 314 2 -43 23 59 -43 22 14 -43 24 16 -43 21 58 0.41 105 0 0 -43 13 32 11 14 21.3 64 312 1 -43 14 24 -43 12 39 -43 14 41 -43 12 23 0.41 106 0 0 -43 3 36 11 14 25.8 63 310 1 -43 4 29 -43 2 44 -43 4 45 -43 2 27 0.41 107 0 0 -42 53 20 11 14 30.3 63 308 0 -42 54 12 -42 52 27 -42 54 29 -42 52 10 0.41 108 0 0 -42 42 43 11 14 34.8 62 307 -1 -42 43 35 -42 41 50 -42 43 52 -42 41 33 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22 11 17 50.1 24 255 -43 -27 18 19 -27 16 25 -27 18 37 -27 16 7 0.42 158 0 0 -26 51 45 11 17 52.8 23 255 -44 -26 52 42 -26 50 48 -26 53 0 -26 50 30 0.43 159 0 0 -26 25 58 11 17 55.3 22 254 -45 -26 26 55 -26 25 1 -26 27 13 -26 24 43 0.43 160 0 0 -26 0 3 11 17 57.8 21 254 -46 -26 1 0 -25 59 6 -26 1 18 -25 58 48 0.43 161 0 0 -25 34 0 11 18 0.1 20 253 -47 -25 34 57 -25 33 3 -25 35 15 -25 32 45 0.43 162 0 0 -25 7 50 11 18 2.4 19 253 -48 -25 8 47 -25 6 53 -25 9 5 -25 6 35 0.43 163 0 0 -24 41 34 11 18 4.5 18 252 -48 -24 42 31 -24 40 37 -24 42 49 -24 40 19 0.43 164 0 0 -24 15 12 11 18 6.6 17 252 -49 -24 16 9 -24 14 15 -24 16 27 -24 13 57 0.43 165 0 0 -23 48 45 11 18 8.5 16 251 -50 -23 49 42 -23 47 48 -23 50 0 -23 47 30 0.43 166 0 0 -23 22 13 11 18 10.4 15 251 -51 -23 23 10 -23 21 16 -23 23 29 -23 20 58 0.44 167 0 0 -22 55 38 11 18 12.1 14 250 -52 -22 56 36 -22 54 41 -22 56 54 -22 54 23 0.44 168 0 0 -22 29 1 11 18 13.7 13 250 -53 -22 29 58 -22 28 4 -22 30 16 -22 27 46 0.44 169 0 0 -22 2 21 11 18 15.2 12 250 -54 -22 3 18 -22 1 24 -22 3 36 -22 1 6 0.44 170 0 0 -21 35 39 11 18 16.6 11 249 -55 -21 36 36 -21 34 42 -21 36 54 -21 34 24 0.45 171 0 0 -21 8 57 11 18 17.8 10 249 -55 -21 9 54 -21 8 0 -21 10 12 -21 7 42 0.45 172 0 0 -20 42 15 11 18 19.0 9 248 -56 -20 43 12 -20 41 18 -20 43 30 -20 41 0 0.45 173 0 0 -20 15 33 11 18 20.0 8 248 -57 -20 16 30 -20 14 37 -20 16 48 -20 14 19 0.46 174 0 0 -19 48 54 11 18 20.9 7 248 -58 -19 49 50 -19 47 57 -19 50 8 -19 47 39 0.47 175 0 0 -19 22 16 11 18 21.6 6 247 -59 -19 23 13 -19 21 19 -19 23 31 -19 21 1 0.48 176 0 0 -18 55 41 11 18 22.3 5 247 -59 -18 56 38 -18 54 44 -18 56 56 -18 54 26 0.49 177 0 0 -18 29 10 11 18 22.8 4 247 -60 -18 30 6 -18 28 13 -18 30 24 -18 27 55 0.51 178 0 0 -18 2 43 11 18 23.2 3 246 -61 -18 3 39 -18 1 46 -18 3 57 -18 1 28 0.55 179 0 0 -17 36 21 11 18 23.5 2 246 -62 -17 37 17 -17 35 24 -17 37 35 -17 35 6 0.63 180 0 0 -17 10 5 11 18 23.6 1 246 -62 -17 11 1 -17 9 8 -17 11 19 -17 8 50 1.00 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 334-181652 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 39 18.1804 DE: -23 15 32.939 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 39 18.1804 DE: -23 15 32.939 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 13.0 * B mag [mag]: 14.3 * Diameter [mas]: 0.10 * 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]: 1.34050 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): 0.002", 0.000", 75.364° remarks: * orbital elements for (4179)Toutatis : Mean anomaly = 340.0321316017 deg Arg. of pericenter = 277.8770454025 deg Long. of node = 125.3589910803 deg Inclination = 0.4480323657 deg Eccentricity = 0.6247570102 Semimajor axis = 2.5432973774 AU Perihelion dist = 0.9543545119 AU Mag: H = 15.32, G = 0.10 Epoch of elements : MJD 60601.46733742 TDT (2024 Oct 18.4673) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#6272023Jun16,0.16,2024,10,18,11.216100,0.022510,-0.371572,10.240350,0.632017,0.003815,0.000265,-0.000001,0.000000 84.5219,-23.2379,8.03,-9.89,False UCAC4 334-181652,18.65505018,-23.2591496,14.30,13.00,12.30,0.1,4,,18.67995490,-23.2379191,5.48,5.73,0,0,0 4179,Toutatis,18.47,2.925,1.3405,0,0,4.876,4.16,,0.0,0 0,339.9186,2024,10,18,277.8770,125.3590,0.4480,0.62476,2.54330,0.95435,15.32,5.0,0.10 1.158,0.0018,0.0003,75,0.0005,Known errors,0.81,0,-1,-1 20241018_181652,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org