IOTA/IOTA-ES occultation update for (4179) Toutatis / UCAC4 335-139210 event on 2024 Jul 28, 10:24 UT Visible from Summary ------- On 2024 Jul 28 UT, the 2.86511113135241 km diameter asteroid (4179) Toutatis will occult a 12.8 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 5.43 mag to 18.21 mag (the magnitude of the asteroid) for at most 0.370 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 Jul 28, 10:14 - 2024 Jul 28, 10:33 * geocentric midpoint of event [JD]: 2460519.93348275 * magnitude of target star: 12.79 * magnitude drop [mag]: 5.43 * estimated maximum duration [s]: 0.370 * Moon: 47 % sunlit, 126° distance * Sun: 147° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 4 * 1 sigma uncertainty interval [path widths]: +/- 0.29 * 1 sigma uncertainty interval [seconds]: +/- 0.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.004, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.004", 0.001", 73°) * approx speed of asteroid's shadow [km/s]: 11.1842 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 335-139210 by 4179 Toutatis on 2024 Jul 28 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 73 0 0 -14 20 58 10 33 28.3 1 114 31 -14 19 43 -14 22 14 -14 18 59 -14 22 57 - 14 20 30 - 14 21 27 .... 74 0 0 -14 46 53 10 33 28.1 2 114 30 -14 45 37 -14 48 9 -14 44 54 -14 48 52 - 14 46 25 - 14 47 21 0.24 75 0 0 -15 12 43 10 33 27.7 3 113 29 -15 11 27 -15 13 58 -15 10 44 -15 14 41 - 15 12 14 - 15 13 11 0.23 76 0 0 -15 38 27 10 33 27.1 4 113 28 -15 37 11 -15 39 42 -15 36 28 -15 40 26 - 15 37 58 - 15 38 55 0.22 77 0 0 -16 4 5 10 33 26.3 5 113 27 -16 2 49 -16 5 20 -16 2 6 -16 6 3 - 16 3 36 - 16 4 33 0.22 78 0 0 -16 29 36 10 33 25.3 6 112 26 -16 28 20 -16 30 51 -16 27 37 -16 31 35 - 16 29 7 - 16 30 4 0.22 79 0 0 -16 55 0 10 33 24.1 7 112 25 -16 53 44 -16 56 15 -16 53 1 -16 56 58 - 16 54 31 - 16 55 28 0.22 80 0 0 -17 20 16 10 33 22.7 8 112 24 -17 19 0 -17 21 31 -17 18 17 -17 22 14 - 17 19 47 - 17 20 44 0.22 81 0 0 -17 45 23 10 33 21.2 9 112 23 -17 44 7 -17 46 38 -17 43 24 -17 47 22 - 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21 12 1 - 21 12 58 0.23 -118 0 0 -20 49 5 10 15 59.9 27 254 -58 -20 47 50 -20 50 20 -20 47 7 -20 51 3 - 20 48 37 - 20 49 33 0.23 -117 0 0 -20 25 28 10 15 55.4 26 253 -57 -20 24 13 -20 26 43 -20 23 30 -20 27 26 - 20 25 0 - 20 25 56 0.23 -116 0 0 -20 1 39 10 15 51.0 25 253 -56 -20 0 24 -20 2 54 -19 59 41 -20 3 37 - 20 1 11 - 20 2 7 0.23 -115 0 0 -19 37 38 10 15 46.8 24 253 -55 -19 36 23 -19 38 53 -19 35 40 -19 39 36 - 19 37 10 - 19 38 6 0.23 -114 0 0 -19 13 27 10 15 42.7 23 252 -54 -19 12 11 -19 14 42 -19 11 28 -19 15 25 - 19 12 58 - 19 13 55 0.23 -113 0 0 -18 49 4 10 15 38.8 22 252 -53 -18 47 49 -18 50 20 -18 47 6 -18 51 3 - 18 48 36 - 18 49 33 0.23 -112 0 0 -18 24 32 10 15 35.1 21 251 -52 -18 23 17 -18 25 47 -18 22 34 -18 26 30 - 18 24 4 - 18 25 0 0.23 -111 0 0 -17 59 50 10 15 31.5 20 251 -51 -17 58 35 -18 1 5 -17 57 52 -18 1 48 - 17 59 22 - 18 0 18 0.23 -110 0 0 -17 34 59 10 15 28.1 19 251 -50 -17 33 44 -17 36 14 -17 33 1 -17 36 58 - 17 34 31 - 17 35 27 0.23 -109 0 0 -17 9 59 10 15 24.8 18 250 -49 -17 8 44 -17 11 15 -17 8 1 -17 11 58 - 17 9 31 - 17 10 28 0.23 -108 0 0 -16 44 52 10 15 21.7 16 250 -48 -16 43 36 -16 46 7 -16 42 53 -16 46 50 - 16 44 23 - 16 45 20 0.23 -107 0 0 -16 19 37 10 15 18.8 15 250 -47 -16 18 21 -16 20 52 -16 17 38 -16 21 35 - 16 19 8 - 16 20 5 0.23 -106 0 0 -15 54 15 10 15 16.1 14 250 -46 -15 52 59 -15 55 30 -15 52 16 -15 56 13 - 15 53 46 - 15 54 43 0.23 -105 0 0 -15 28 46 10 15 13.5 13 249 -45 -15 27 31 -15 30 2 -15 26 47 -15 30 45 - 15 28 18 - 15 29 14 0.24 -104 0 0 -15 3 12 10 15 11.1 12 249 -44 -15 1 56 -15 4 28 -15 1 13 -15 5 11 - 15 2 44 - 15 3 40 0.24 -103 0 0 -14 37 33 10 15 8.9 11 249 -43 -14 36 17 -14 38 48 -14 35 34 -14 39 31 - 14 37 4 - 14 38 1 0.24 -102 0 0 -14 11 49 10 15 6.9 10 248 -42 -14 10 33 -14 13 4 -14 9 50 -14 13 47 - 14 11 20 - 14 12 17 0.24 -101 0 0 -13 46 1 10 15 5.1 9 248 -41 -13 44 45 -13 47 16 -13 44 2 -13 47 59 - 13 45 32 - 13 46 29 0.24 -100 0 0 -13 20 9 10 15 3.4 8 248 -40 -13 18 54 -13 21 25 -13 18 11 -13 22 8 - 13 19 41 - 13 20 38 0.25 - 99 0 0 -12 54 15 10 15 2.0 7 248 -39 -12 53 0 -12 55 31 -12 52 17 -12 56 14 - 12 53 47 - 12 54 44 0.25 - 98 0 0 -12 28 19 10 15 0.8 6 248 -38 -12 27 4 -12 29 35 -12 26 20 -12 30 18 - 12 27 51 - 12 28 48 0.26 - 97 0 0 -12 2 22 10 14 59.7 5 247 -37 -12 1 6 -12 3 37 -12 0 23 -12 4 20 - 12 1 53 - 12 2 50 0.27 - 96 0 0 -11 36 23 10 14 58.9 4 247 -36 -11 35 8 -11 37 39 -11 34 25 -11 38 22 - 11 35 55 - 11 36 52 0.28 - 95 0 0 -11 10 25 10 14 58.2 3 247 -35 -11 9 9 -11 11 40 -11 8 26 -11 12 24 - 11 9 56 - 11 10 53 0.31 - 94 0 0 -10 44 27 10 14 57.8 2 247 -33 -10 43 11 -10 45 42 -10 42 28 -10 46 26 - 10 43 58 - 10 44 55 0.37 - 93 0 0 -10 18 30 10 14 57.5 1 247 -32 -10 17 14 -10 19 46 -10 16 31 -10 20 29 - 10 18 2 - 10 18 58 0.60 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 335-139210 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 12 59.1230 DE: -23 10 05.701 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 12 59.1230 DE: -23 10 05.701 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.600,0.400) * V mag [mag]: 12.8 * B mag [mag]: 15.9 * Diameter [mas]: 1.50 * 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]: 1.18750 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", 73.178° remarks: * orbital elements for (4179)Toutatis : Mean anomaly = 320.1009864252 deg Arg. of pericenter = 277.8733023322 deg Long. of node = 125.3590846314 deg Inclination = 0.4480275959 deg Eccentricity = 0.6247587541 Semimajor axis = 2.5434164443 AU Perihelion dist = 0.9543947553 AU Mag: H = 15.32, G = 0.10 Epoch of elements : MJD 60519.43348325 TDT (2024 Jul 28.4335) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#6272023Jun16,0.37,2024,7,28,10.403586,0.008760,-0.226190,-6.307884,-0.245354,0.002764,0.000050,0.000001,0.000000 170.9907,-23.1624,25.58,18.81,False UCAC4 335-139210,18.21642308,-23.1682503,15.87,12.79,11.13,1.5,0,,18.24161394,-23.1623887,5.42,6.63,0,0,0 4179,Toutatis,18.21,4.157,1.1875,0,0,-3.386,-1.81,,0.0,0 0,319.9957,2024,7,28,277.8733,125.3591,0.4480,0.62476,2.54342,0.95439,15.32,5.0,0.10 1.285,0.0040,0.0010,73,0.0014,Known errors,0.87,0,-1,-1 20240728_139210,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org