IOTA/IOTA-ES occultation update for (4179) Toutatis / UCAC4 338-188307 event on 2024 Nov 02, 11:31 UT Visible from Summary ------- On 2024 Nov 02 UT, the 2.895 km diameter asteroid (4179) Toutatis will occult a 10.6 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 7.70 mag to 18.32 mag (the magnitude of the asteroid) for at most 0.130 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 Nov 02, 11:26 - 2024 Nov 02, 11:36 * geocentric midpoint of event [JD]: 2460616.98033133 * magnitude of target star: 10.62 * magnitude drop [mag]: 7.70 * estimated maximum duration [s]: 0.130 * Moon: 1 % sunlit, 56° distance * Sun: 66° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 3 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 0.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.001, +/- 0.000) * 1 sigma uncertainty ellipse (major, minor, PA): (0.001", 0.000", 75°) * approx speed of asteroid's shadow [km/s]: 22.8460 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 338-188307 by 4179 Toutatis on 2024 Nov 2 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 - 20 0 0 -11 41 45 11 27 2.9 0 113 66 -11 42 36 -11 40 53 -11 42 46 -11 40 43 .... - 19 0 0 -12 6 46 11 27 3.0 1 113 67 -12 7 38 -12 5 55 -12 7 48 -12 5 44 0.16 - 18 0 0 -12 31 39 11 27 3.1 3 113 68 -12 32 30 -12 30 47 -12 32 41 -12 30 37 0.14 - 17 0 0 -12 56 21 11 27 3.4 4 112 69 -12 57 13 -12 55 30 -12 57 23 -12 55 19 0.13 - 16 0 0 -13 20 53 11 27 3.8 5 112 70 -13 21 44 -13 20 2 -13 21 55 -13 19 51 0.12 - 15 0 0 -13 45 14 11 27 4.3 6 112 71 -13 46 5 -13 44 23 -13 46 16 -13 44 12 0.12 - 14 0 0 -14 9 23 11 27 4.8 7 112 72 -14 10 15 -14 8 32 -14 10 25 -14 8 22 0.12 - 13 0 0 -14 33 21 11 27 5.5 8 111 73 -14 34 12 -14 32 29 -14 34 22 -14 32 19 0.12 - 12 0 0 -14 57 5 11 27 6.2 9 111 74 -14 57 56 -14 56 14 -14 58 7 -14 56 4 0.11 - 11 0 0 -15 20 37 11 27 7.0 10 111 75 -15 21 28 -15 19 46 -15 21 38 -15 19 35 0.11 - 10 0 0 -15 43 55 11 27 8.0 11 111 76 -15 44 46 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0.12 151 0 0 - 3 26 27 11 36 12.8 12 248 -54 - 3 27 18 - 3 25 35 - 3 27 29 - 3 25 24 0.12 152 0 0 - 3 0 10 11 36 13.8 11 248 -55 - 3 1 1 - 2 59 18 - 3 1 12 - 2 59 7 0.12 153 0 0 - 2 33 57 11 36 14.7 9 248 -57 - 2 34 49 - 2 33 5 - 2 34 59 - 2 32 55 0.13 154 0 0 - 2 7 49 11 36 15.6 8 248 -58 - 2 8 41 - 2 6 58 - 2 8 51 - 2 6 47 0.13 155 0 0 - 1 41 47 11 36 16.3 7 247 -59 - 1 42 38 - 1 40 55 - 1 42 49 - 1 40 45 0.13 156 0 0 - 1 15 51 11 36 16.9 6 247 -60 - 1 16 42 - 1 14 59 - 1 16 53 - 1 14 49 0.14 157 0 0 - 0 50 1 11 36 17.4 5 247 -61 - 0 50 53 - 0 49 10 - 0 51 3 - 0 48 59 0.14 158 0 0 - 0 24 19 11 36 17.8 4 247 -62 - 0 25 11 - 0 23 28 - 0 25 21 - 0 23 17 0.16 159 0 0 0 1 15 11 36 18.2 3 247 -63 0 0 24 0 2 6 0 0 13 0 2 17 0.17 160 0 0 0 26 40 11 36 18.4 2 247 -64 0 25 49 0 27 32 0 25 39 0 27 42 0.21 161 0 0 0 51 57 11 36 18.5 1 247 -65 0 51 5 0 52 48 0 50 55 0 52 58 0.37 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 338-188307 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 12 20.1110 DE: -22 35 14.727 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 12 20.1108 DE: -22 35 14.727 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.6 * B mag [mag]: 10.9 * 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]: 1.32970 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): 0.001", 0.000", 74.579° remarks: * orbital elements for (4179)Toutatis : Mean anomaly = 343.6802068003 deg Arg. of pericenter = 277.8776954266 deg Long. of node = 125.3589730244 deg Inclination = 0.4480318768 deg Eccentricity = 0.6247587813 Semimajor axis = 2.5432924513 AU Perihelion dist = 0.9543481590 AU Mag: H = 15.32, G = 0.10 Epoch of elements : MJD 60616.48033125 TDT (2024 Nov 02.4803) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#6272023Jun16,0.13,2024,11,2,11.527952,0.011434,-0.096883,12.803395,1.533548,0.003136,0.000395,-0.000001,0.000000 73.3008,-22.5469,2.97,-14.98,False UCAC4 338-188307,19.20558645,-22.5874240,10.92,10.62,10.46,0.0,0,,19.23023104,-22.5469080,7.70,7.41,0,0,0 4179,Toutatis,18.32,2.895,1.3297,0,0,6.114,10.15,,0.0,0 0,343.5635,2024,11,2,277.8777,125.3590,0.4480,0.62476,2.54329,0.95435,15.32,5.0,0.10 1.102,0.0014,0.0002,75,0.0003,Known errors,1.18,0,-1,-1 20241102_188307,60140.68 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org