IOTA/IOTA-ES occultation update for (1182) Ilona / TYC 1785-00488-1 event on 2024 Aug 12, 18:13 UT Visible from Summary ------- On 2024 Aug 12 UT, the 14.953 km diameter asteroid (1182) Ilona will occult a 10.5 mag star in the constellation Aries for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.13 mag to 15.62 mag (the magnitude of the asteroid) for at most 0.790 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: 93 * date and approx. time of event: 2024 Aug 12, 18:09 - 2024 Aug 12, 18:16 * geocentric midpoint of event [JD]: 2460535.25921729 * magnitude of target star: 10.50 * magnitude drop [mag]: 5.13 * estimated maximum duration [s]: 0.790 * Moon: 51 % sunlit, 175° distance * Sun: 92° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 0.48 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.004", 72°) * approx speed of asteroid's shadow [km/s]: 18.9929 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1785-00488-1 by 1182 Ilona on 2024 Aug 12 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 163 0 0 -64 51 51 18 10 4.3 1 6 -20 .. .. .. -63 58 58 .. .. .. -63 15 15 .... 164 0 0 -61 53 29 18 10 5.3 4 5 -20 -62 34 26 -61 16 4 -63 17 47 -60 43 3 0.76 165 0 0 -59 29 15 18 10 7.4 6 4 -19 -60 1 31 -58 58 48 -60 34 12 -58 31 16 1.08 166 0 0 -57 22 8 18 10 10.1 8 4 -19 -57 49 32 -56 55 52 -58 16 47 -56 31 49 1.19 167 0 0 -55 26 1 18 10 13.3 10 3 -19 -55 50 12 -55 2 37 -56 14 0 -54 41 3 1.24 168 0 0 -53 37 54 18 10 17.0 12 2 -18 -53 59 44 -53 16 39 -54 21 6 -52 56 56 1.28 169 0 0 -51 56 3 18 10 21.0 14 1 -17 -52 16 5 -51 36 27 -52 35 36 -51 18 13 1.30 170 0 0 -50 19 21 18 10 25.4 15 360 -17 -50 37 57 -50 1 6 -50 56 1 -49 44 4 1.31 171 0 0 -48 47 2 18 10 30.1 17 359 -16 -49 4 28 -48 29 55 -49 21 20 -48 13 53 1.32 172 0 0 -47 18 36 18 10 35.1 18 358 -15 -47 35 2 -47 2 25 -47 50 55 -46 47 15 1.33 173 0 0 -45 53 37 18 10 40.3 20 357 -14 -46 9 13 -45 38 15 -46 24 14 -45 23 49 1.34 174 0 0 -44 31 48 18 10 45.7 21 356 -13 -44 46 39 -44 17 8 -45 0 57 -44 3 21 1.35 175 0 0 -43 12 54 18 10 51.3 22 355 -12 -43 27 6 -42 58 51 -43 40 46 -42 45 39 1.35 176 0 0 -41 56 44 18 10 57.1 23 354 -12 -42 10 21 -41 43 14 -42 23 27 -41 30 33 1.36 177 0 0 -40 43 7 18 11 3.1 25 353 -11 -40 56 14 -40 30 8 -41 8 50 -40 17 54 1.36 178 0 0 -39 31 58 18 11 9.2 26 352 -10 -39 44 37 -39 19 25 -39 56 46 -39 7 36 1.37 179 0 0 -38 23 8 18 11 15.4 27 350 -9 -38 35 23 -38 11 0 -38 47 7 -37 59 34 1.37 180 0 0 -37 16 33 18 11 21.7 28 349 -8 -37 28 25 -37 4 48 -37 39 47 -36 53 42 1.37 -179 0 0 -36 12 8 18 11 28.2 28 348 -6 -36 23 38 -36 0 42 -36 34 40 -35 49 55 1.38 -178 0 0 -35 9 46 18 11 34.7 29 347 -5 -35 20 58 -34 58 40 -35 31 41 -34 48 10 1.38 -177 0 0 -34 9 26 18 11 41.3 30 346 -4 -34 20 20 -33 58 37 -34 30 46 -33 48 24 1.38 -176 0 0 -33 11 4 18 11 48.0 31 345 -3 -33 21 42 -33 0 31 -33 31 52 -32 50 32 1.39 -175 0 0 -32 14 36 18 11 54.6 31 343 -2 -32 24 59 -32 4 18 -32 34 54 -31 54 33 1.39 -174 0 0 -31 20 1 18 12 1.4 32 342 -1 -31 30 9 -31 9 56 -31 39 51 -31 0 24 1.39 -173 0 0 -30 27 14 18 12 8.1 33 341 0 -30 37 9 -30 17 22 -30 46 39 -30 8 2 1.39 -172 0 0 -29 36 14 18 12 14.9 33 340 1 -29 45 57 -29 26 34 -29 55 15 -29 17 25 1.40 -171 0 0 -28 46 59 18 12 21.7 34 338 2 -28 56 30 -28 37 30 -29 5 37 -28 28 31 1.40 -170 0 0 -27 59 25 18 12 28.5 34 337 3 -28 8 47 -27 50 7 -28 17 43 -27 41 19 1.40 -169 0 0 -27 13 32 18 12 35.2 34 336 4 -27 22 44 -27 4 24 -27 31 30 -26 55 45 1.40 -168 0 0 -26 29 18 18 12 42.0 35 335 6 -26 38 20 -26 20 19 -26 46 58 -26 11 48 1.40 -167 0 0 -25 46 40 18 12 48.7 35 333 7 -25 55 33 -25 37 49 -26 4 3 -25 29 27 1.41 -166 0 0 -25 5 37 18 12 55.4 35 332 8 -25 14 22 -24 56 55 -25 22 43 -24 48 40 1.41 -165 0 0 -24 26 8 18 13 2.1 35 331 9 -24 34 45 -24 17 33 -24 42 59 -24 9 25 1.41 -164 0 0 -23 48 10 18 13 8.7 35 330 10 -23 56 40 -23 39 42 -24 4 47 -23 31 41 1.41 -163 0 0 -23 11 42 18 13 15.2 35 329 11 -23 20 5 -23 3 21 -23 28 6 -22 55 27 1.41 -162 0 0 -22 36 44 18 13 21.7 35 327 12 -22 45 0 -22 28 29 -22 52 54 -22 20 40 1.42 -161 0 0 -22 3 13 18 13 28.2 35 326 13 -22 11 23 -21 55 4 -22 19 12 -21 47 21 1.42 -160 0 0 -21 31 8 18 13 34.6 35 325 14 -21 39 13 -21 23 5 -21 46 56 -21 15 27 1.42 -159 0 0 -21 0 29 18 13 40.9 35 324 15 -21 8 28 -20 52 31 -21 16 6 -20 44 58 1.42 -158 0 0 -20 31 13 18 13 47.1 35 323 16 -20 39 8 -20 23 21 -20 46 41 -20 15 53 1.42 -157 0 0 -20 3 21 18 13 53.3 35 322 18 -20 11 11 -19 55 33 -20 18 39 -19 48 9 1.42 -156 0 0 -19 36 50 18 13 59.4 34 321 19 -19 44 35 -19 29 6 -19 51 59 -19 21 47 1.42 -155 0 0 -19 11 40 18 14 5.4 34 320 20 -19 19 21 -19 4 1 -19 26 41 -18 56 45 1.43 -154 0 0 -18 47 50 18 14 11.3 34 319 21 -18 55 27 -18 40 14 -19 2 44 -18 33 3 1.43 -153 0 0 -18 25 19 18 14 17.1 33 318 22 -18 32 52 -18 17 47 -18 40 5 -18 10 38 1.43 -152 0 0 -18 4 6 18 14 22.8 33 317 23 -18 11 36 -17 56 37 -18 18 45 -17 49 32 1.43 -151 0 0 -17 44 10 18 14 28.5 32 316 24 -17 51 37 -17 36 44 -17 58 43 -17 29 42 1.43 -150 0 0 -17 25 30 18 14 34.0 32 315 25 -17 32 54 -17 18 8 -17 39 58 -17 11 8 1.43 -149 0 0 -17 8 7 18 14 39.5 31 314 26 -17 15 28 -17 0 47 -17 22 29 -16 53 50 1.43 -148 0 0 -16 51 58 18 14 44.8 31 313 27 -16 59 17 -16 44 41 -17 6 15 -16 37 46 1.43 -147 0 0 -16 37 4 18 14 50.0 30 313 28 -16 44 20 -16 29 49 -16 51 17 -16 22 56 1.43 -146 0 0 -16 23 23 18 14 55.2 30 312 29 -16 30 38 -16 16 10 -16 37 32 -16 9 20 1.43 -145 0 0 -16 10 56 18 15 0.2 29 311 30 -16 18 8 -16 3 45 -16 25 1 -15 56 56 1.43 -144 0 0 -15 59 41 18 15 5.1 29 310 31 -16 6 52 -15 52 32 -16 13 43 -15 45 45 1.43 -143 0 0 -15 49 39 18 15 9.9 28 310 32 -15 56 48 -15 42 31 -16 3 37 -15 35 46 1.43 -142 0 0 -15 40 48 18 15 14.5 27 309 33 -15 47 56 -15 33 42 -15 54 44 -15 26 58 1.43 -141 0 0 -15 33 9 18 15 19.1 27 308 33 -15 40 16 -15 26 4 -15 47 2 -15 19 21 1.44 -140 0 0 -15 26 41 18 15 23.5 26 308 34 -15 33 46 -15 19 37 -15 40 32 -15 12 54 1.44 -139 0 0 -15 21 23 18 15 27.9 25 307 35 -15 28 28 -15 14 20 -15 35 13 -15 7 39 1.44 -138 0 0 -15 17 16 18 15 32.1 24 307 36 -15 24 20 -15 10 13 -15 31 4 -15 3 33 1.44 -137 0 0 -15 14 19 18 15 36.1 24 306 37 -15 21 22 -15 7 17 -15 28 6 -15 0 37 1.44 -136 0 0 -15 12 32 18 15 40.1 23 305 38 -15 19 35 -15 5 30 -15 26 18 -14 58 50 1.44 -135 0 0 -15 11 54 18 15 43.9 22 305 39 -15 18 57 -15 4 53 -15 25 40 -14 58 13 1.44 -134 0 0 -15 12 27 18 15 47.5 21 305 39 -15 19 29 -15 5 25 -15 26 12 -14 58 46 1.44 -133 0 0 -15 14 8 18 15 51.1 20 304 40 -15 21 11 -15 7 7 -15 27 54 -15 0 27 1.44 -132 0 0 -15 17 0 18 15 54.5 20 304 41 -15 24 3 -15 9 58 -15 30 46 -15 3 18 1.44 -131 0 0 -15 21 0 18 15 57.8 19 303 42 -15 28 4 -15 13 58 -15 34 48 -15 7 18 1.44 -130 0 0 -15 26 10 18 16 0.9 18 303 43 -15 33 14 -15 19 8 -15 39 59 -15 12 27 1.44 -129 0 0 -15 32 30 18 16 3.9 17 302 43 -15 39 35 -15 25 26 -15 46 20 -15 18 45 1.44 -128 0 0 -15 39 59 18 16 6.7 16 302 44 -15 47 5 -15 32 55 -15 53 51 -15 26 12 1.44 -127 0 0 -15 48 38 18 16 9.4 15 302 45 -15 55 45 -15 41 33 -16 2 32 -15 34 49 1.44 -126 0 0 -15 58 27 18 16 12.0 14 301 45 -16 5 35 -15 51 20 -16 12 24 -15 44 36 1.45 -125 0 0 -16 9 26 18 16 14.4 13 301 46 -16 16 36 -16 2 18 -16 23 25 -15 55 32 1.45 -124 0 0 -16 21 35 18 16 16.6 12 300 46 -16 28 47 -16 14 25 -16 35 38 -16 7 38 1.45 -123 0 0 -16 34 55 18 16 18.7 12 300 47 -16 42 8 -16 27 44 -16 49 1 -16 20 54 1.45 -122 0 0 -16 49 26 18 16 20.7 11 300 47 -16 56 41 -16 42 12 -17 3 36 -16 35 21 1.46 -121 0 0 -17 5 8 18 16 22.4 10 299 48 -17 12 25 -16 57 52 -17 19 22 -16 50 59 1.46 -120 0 0 -17 22 2 18 16 24.0 9 299 48 -17 29 21 -17 14 43 -17 36 20 -17 7 48 1.47 -119 0 0 -17 40 7 18 16 25.5 8 299 49 -17 47 29 -17 32 47 -17 54 31 -17 25 49 1.47 -118 0 0 -17 59 25 18 16 26.7 7 298 49 -18 6 50 -17 52 2 -18 13 54 -17 45 2 1.48 -117 0 0 -18 19 56 18 16 27.8 6 298 49 -18 27 24 -18 12 30 -18 34 31 -18 5 27 1.49 -116 0 0 -18 41 41 18 16 28.7 5 298 50 -18 49 12 -18 34 11 -18 56 22 -18 27 5 1.51 -115 0 0 -19 4 39 18 16 29.5 4 297 50 -19 12 14 -18 57 6 -19 19 27 -18 49 57 1.54 -114 0 0 -19 28 52 18 16 30.0 3 297 50 -19 36 30 -19 21 16 -19 43 47 -19 14 3 1.60 -113 0 0 -19 54 21 18 16 30.4 2 297 50 -20 2 3 -19 46 41 -20 9 23 -19 39 24 1.73 -112 0 0 -20 21 5 18 16 30.6 1 296 50 -20 28 51 -20 13 21 -20 36 16 -20 6 1 2.39 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 1785-00488-1 * constellation : Aries * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 02 54 58.8212 DE: +24 25 02.954 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 02 54 58.8217 DE: +24 25 02.957 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.5 * B mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1182) Ilona asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.012 distance from Earth [AU]: 1.70450 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 date of fit: 2023 Apr 24 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): 0.018", 0.004", 71.585° remarks: * orbital elements for (1182)Ilona : Mean anomaly = 343.1986148639 deg Arg. of pericenter = 63.3699318861 deg Long. of node = 336.2974514181 deg Inclination = 9.3915220406 deg Eccentricity = 0.1172733165 Semimajor axis = 2.2594112551 AU Perihelion dist = 1.9944426039 AU Mag: H = 11.64, G = 0.15 Epoch of elements : MJD 60534.75921779 TDT (2024 Aug 12.7592) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.79,2024,8,12,18.221215,0.433166,-0.691599,9.077417,5.702753,-0.004888,-0.001494,0.000000,0.000000 169.0991,24.5172,-92.08,14.65,False TYC 1785-00488-1,2.91633919,24.4174872,10.84,10.50,10.32,0.0,0,,2.94018919,24.5171662,5.13,4.87,0,0,0 1182,Ilona,15.62,14.953,1.7045,0,0,3.432,29.42,,0.8,0 0,342.9783,2024,8,12,63.3699,336.2975,9.3915,0.11727,2.25941,1.99444,11.64,5.0,0.15 1.475,0.0180,0.0040,72,0.0058,Known errors,1.10,0,-1,-1 20240812_0488-1,60140.24 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org