IOTA/IOTA-ES occultation update for (4179) Toutatis / UCAC4 334-123946 event on 2024 Sep 04, 11:55 UT Visible from Summary ------- On 2024 Sep 04 UT, the 2.85718907980768 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 5.25 mag to 18.56 mag (the magnitude of the asteroid) for at most 1.510 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: 98 * date and approx. time of event: 2024 Sep 04, 11:01 - 2024 Sep 04, 12:48 * geocentric midpoint of event [JD]: 2460557.99686154 * magnitude of target star: 13.32 * magnitude drop [mag]: 5.25 * estimated maximum duration [s]: 1.510 * Moon: 2 % sunlit, 90° distance * Sun: 105° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 3 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.003, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.003", 0.001", 77°) * approx speed of asteroid's shadow [km/s]: 2.0100 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 334-123946 by 4179 Toutatis on 2024 Sep 4 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 30 0 0 2 52 34 11 2 27.7 1 113 74 2 51 40 2 53 29 2 51 2 2 54 7 .... 31 0 0 2 26 11 11 2 29.0 2 113 73 2 25 17 2 27 6 2 24 39 2 27 44 0.18 32 0 0 1 59 33 11 2 31.4 3 114 72 1 58 38 2 0 27 1 58 0 2 1 5 0.16 33 0 0 1 32 40 11 2 35.1 4 114 70 1 31 45 1 33 34 1 31 7 1 34 12 0.16 34 0 0 1 5 32 11 2 40.0 5 114 69 1 4 37 1 6 27 1 3 59 1 7 5 0.15 35 0 0 0 38 10 11 2 46.1 6 114 68 0 37 15 0 39 5 0 36 37 0 39 43 0.15 36 0 0 0 10 35 11 2 53.5 7 114 67 0 9 40 0 11 30 0 9 2 0 12 9 0.15 37 0 0 - 0 17 12 11 3 2.1 8 114 66 - 0 18 7 - 0 16 17 - 0 18 46 - 0 15 39 0.15 38 0 0 - 0 45 12 11 3 12.1 10 114 65 - 0 46 7 - 0 44 17 - 0 46 46 - 0 43 39 0.15 39 0 0 - 1 13 24 11 3 23.4 11 114 64 - 1 14 19 - 1 12 29 - 1 14 58 - 1 11 51 0.15 40 0 0 - 1 41 47 11 3 36.0 12 114 63 - 1 42 42 - 1 40 51 - 1 43 20 - 1 40 13 0.15 41 0 0 - 2 10 20 11 3 49.9 13 113 61 - 2 11 15 - 2 9 24 - 2 11 53 - 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52 12 47 21.8 10 248 -81 -11 37 46 -11 35 57 -11 38 24 -11 35 20 0.15 177 0 0 -11 11 14 12 47 31.6 9 248 -80 -11 12 9 -11 10 20 -11 12 47 -11 9 42 0.16 178 0 0 -10 45 31 12 47 40.2 8 248 -79 -10 46 25 -10 44 36 -10 47 3 -10 43 59 0.16 179 0 0 -10 19 41 12 47 47.6 6 247 -78 -10 20 36 -10 18 47 -10 21 14 -10 18 9 0.17 180 0 0 - 9 53 47 12 47 53.9 5 247 -77 - 9 54 41 - 9 52 53 - 9 55 19 - 9 52 15 0.17 -179 0 0 - 9 27 49 12 47 59.0 4 247 -77 - 9 28 43 - 9 26 54 - 9 29 21 - 9 26 16 0.18 -178 0 0 - 9 1 47 12 48 2.9 3 247 -76 - 9 2 41 - 9 0 52 - 9 3 19 - 9 0 14 0.20 -177 0 0 - 8 35 42 12 48 5.7 2 247 -75 - 8 36 36 - 8 34 47 - 8 37 14 - 8 34 10 0.24 -176 0 0 - 8 9 35 12 48 7.3 1 247 -74 - 8 10 30 - 8 8 41 - 8 11 8 - 8 8 3 0.35 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: UCAC4 334-123946 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 49 30.0780 DE: -23 21 32.489 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 49 30.0779 DE: -23 21 32.489 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 13.3 * B mag [mag]: 15.3 * Diameter [mas]: 0.20 * 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]: 1.25340 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): 0.003", 0.001", 76.87° remarks: * orbital elements for (4179)Toutatis : Mean anomaly = 329.3483687347 deg Arg. of pericenter = 277.8751504935 deg Long. of node = 125.3590284886 deg Inclination = 0.4480292044 deg Eccentricity = 0.6247568667 Semimajor axis = 2.5433496388 AU Perihelion dist = 0.9543744875 AU Mag: H = 15.32, G = 0.10 Epoch of elements : MJD 60557.49686013 TDT (2024 Sep 04.4969) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#6272023Jun16,1.51,2024,9,4,11.924677,-0.004697,-0.043754,1.128511,-0.116417,0.004746,-0.000076,0.000000,0.000000 104.7848,-23.3675,0.85,6.89,False UCAC4 334-123946,17.82502169,-23.3590248,15.34,13.32,12.23,0.2,0,,17.85011945,-23.3675380,5.24,5.88,0,0,1 4179,Toutatis,18.56,3.039,1.2534,0,0,0.576,-0.82,,0.0,0 0,329.2276,2024,9,4,277.8752,125.3590,0.4480,0.62476,2.54335,0.95437,15.32,5.0,0.10 1.347,0.0030,0.0007,77,0.0012,Known errors,0.84,0,-1,-1 20240904_123946,60140.54 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 12:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org