IOTA/IOTA-ES occultation update for (4179) Toutatis / UCAC4 335-151331 event on 2024 Jul 22, 19:42 UT Visible from Summary ------- On 2024 Jul 22 UT, the 2.82222858428351 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 4.84 mag to 18.14 mag (the magnitude of the asteroid) for at most 0.240 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: 96 * date and approx. time of event: 2024 Jul 22, 19:33 - 2024 Jul 22, 19:51 * geocentric midpoint of event [JD]: 2460514.32114162 * magnitude of target star: 13.31 * magnitude drop [mag]: 4.84 * estimated maximum duration [s]: 0.240 * Moon: 97 % sunlit, 45° distance * Sun: 155° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 3 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 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", 72°) * approx speed of asteroid's shadow [km/s]: 12.2822 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 335-151331 by 4179 Toutatis on 2024 Jul 22 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 - 59 0 0 -15 21 31 19 50 51.6 1 114 24 -15 20 38 -15 22 24 -15 19 55 -15 23 8 .... - 58 0 0 -15 47 19 19 50 51.4 2 113 23 -15 46 26 -15 48 12 -15 45 42 -15 48 56 0.24 - 57 0 0 -16 13 1 19 50 51.0 3 113 22 -16 12 8 -16 13 54 -16 11 24 -16 14 37 0.23 - 56 0 0 -16 38 36 19 50 50.4 4 113 21 -16 37 43 -16 39 29 -16 36 59 -16 40 13 0.23 - 55 0 0 -17 4 4 19 50 49.7 5 113 20 -17 3 11 -17 4 57 -17 2 28 -17 5 41 0.23 - 54 0 0 -17 29 25 19 50 48.7 6 112 19 -17 28 32 -17 30 18 -17 27 48 -17 31 1 0.23 - 53 0 0 -17 54 37 19 50 47.6 7 112 17 -17 53 44 -17 55 30 -17 53 1 -17 56 14 0.23 - 52 0 0 -18 19 41 19 50 46.4 8 112 16 -18 18 48 -18 20 34 -18 18 4 -18 21 17 0.23 - 51 0 0 -18 44 35 19 50 44.9 9 111 15 -18 43 42 -18 45 28 -18 42 59 -18 46 12 0.23 - 50 0 0 -19 9 20 19 50 43.3 10 111 14 -19 8 27 -19 10 12 -19 7 43 -19 10 56 0.23 - 49 0 0 -19 33 54 19 50 41.6 11 111 13 -19 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19 34 20.0 15 250 -40 -15 50 22 -15 52 7 -15 49 38 -15 52 51 0.24 122 0 0 -15 25 42 19 34 17.5 14 249 -39 -15 24 49 -15 26 35 -15 24 5 -15 27 19 0.24 123 0 0 -15 0 4 19 34 15.3 13 249 -38 -14 59 11 -15 0 57 -14 58 28 -15 1 41 0.24 124 0 0 -14 34 22 19 34 13.1 12 249 -37 -14 33 29 -14 35 15 -14 32 45 -14 35 59 0.25 125 0 0 -14 8 36 19 34 11.2 11 249 -35 -14 7 43 -14 9 29 -14 6 59 -14 10 13 0.25 126 0 0 -13 42 46 19 34 9.4 10 248 -34 -13 41 53 -13 43 39 -13 41 10 -13 44 23 0.25 127 0 0 -13 16 54 19 34 7.8 9 248 -33 -13 16 1 -13 17 47 -13 15 17 -13 18 31 0.25 128 0 0 -12 51 0 19 34 6.4 8 248 -32 -12 50 7 -12 51 53 -12 49 23 -12 52 37 0.26 129 0 0 -12 25 4 19 34 5.2 7 248 -31 -12 24 11 -12 25 57 -12 23 27 -12 26 41 0.26 130 0 0 -11 59 8 19 34 4.1 6 248 -30 -11 58 15 -12 0 1 -11 57 31 -12 0 44 0.27 131 0 0 -11 33 11 19 34 3.2 5 247 -29 -11 32 18 -11 34 4 -11 31 34 -11 34 48 0.28 132 0 0 -11 7 15 19 34 2.5 3 247 -28 -11 6 22 -11 8 8 -11 5 38 -11 8 52 0.30 133 0 0 -10 41 20 19 34 2.0 2 247 -27 -10 40 27 -10 42 13 -10 39 43 -10 42 57 0.33 134 0 0 -10 15 27 19 34 1.7 1 247 -26 -10 14 34 -10 16 20 -10 13 50 -10 17 3 0.42 135 0 0 - 9 49 36 19 34 1.5 0 247 -25 - 9 48 43 - 9 50 29 - 9 48 0 - 9 51 13 1.30 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 335-151331 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 20 57.1755 DE: -23 05 28.666 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 20 57.1755 DE: -23 05 28.666 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 13.3 * B mag [mag]: 14.6 * 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]: 1.19640 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", 72.186° remarks: * orbital elements for (4179)Toutatis : Mean anomaly = 318.7375934836 deg Arg. of pericenter = 277.8729855350 deg Long. of node = 125.3591206973 deg Inclination = 0.4480267381 deg Eccentricity = 0.6247591976 Semimajor axis = 2.5434277124 AU Perihelion dist = 0.9543978558 AU Mag: H = 15.32, G = 0.10 Epoch of elements : MJD 60513.82114183 TDT (2024 Jul 22.8211) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#6272023Jun16,0.24,2024,7,22,19.707399,0.011650,-0.231545,-6.923613,-0.349770,0.002210,0.000067,0.000001,0.000000 38.9570,-23.0806,-113.98,20.05,False UCAC4 335-151331,18.34921543,-23.0912962,14.60,13.31,12.61,0.1,0,,18.37439798,-23.0805908,4.84,5.08,0,0,0 4179,Toutatis,18.14,2.909,1.1964,0,0,-3.687,-2.57,,0.0,0 0,318.5381,2024,7,22,277.8730,125.3591,0.4480,0.62476,2.54343,0.95440,15.32,5.0,0.10 1.412,0.0040,0.0009,72,0.0014,Known errors,0.81,0,-1,-1 20240722_151331,60140.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org