IOTA/IOTA-ES occultation update for (435) Ella / UCAC4 325-151345 event on 2024 Oct 17, 10:19 UT Visible from Summary ------- On 2024 Oct 17 UT, the 38.4188378050676 km diameter asteroid (435) Ella will occult a 10.3 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 4.82 mag to 15.12 mag (the magnitude of the asteroid) for at most 1.360 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 Oct 17, 10:16 - 2024 Oct 17, 10:22 * geocentric midpoint of event [JD]: 2460600.93043638 * magnitude of target star: 10.31 * magnitude drop [mag]: 4.82 * estimated maximum duration [s]: 1.360 * Moon: 100 % sunlit, 109° distance * Sun: 70° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 50 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.003", 91°) * approx speed of asteroid's shadow [km/s]: 28.3890 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 325-151345 by 435 Ella on 2024 Oct 17 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 - 16 0 0 -38 30 10 10 16 56.0 1 122 45 -38 46 19 -38 14 4 -38 50 16 -38 10 10 .... - 15 0 0 -39 0 23 10 16 56.1 2 121 46 -39 16 35 -38 44 17 -39 20 32 -38 40 22 0.73 - 14 0 0 -39 30 34 10 16 56.2 3 121 46 -39 46 47 -39 14 26 -39 50 44 -39 10 31 0.77 - 13 0 0 -40 0 40 10 16 56.5 3 120 46 -40 16 54 -39 44 31 -40 20 52 -39 40 36 0.78 - 12 0 0 -40 30 42 10 16 56.8 4 119 47 -40 46 57 -40 14 31 -40 50 55 -40 10 35 0.79 - 11 0 0 -41 0 37 10 16 57.2 5 119 47 -41 16 53 -40 44 25 -41 20 51 -40 40 29 0.80 - 10 0 0 -41 30 25 10 16 57.7 6 118 47 -41 46 42 -41 14 12 -41 50 41 -41 10 16 0.80 - 9 0 0 -42 0 5 10 16 58.2 7 117 48 -42 16 23 -41 43 52 -42 20 22 -41 39 55 0.81 - 8 0 0 -42 29 36 10 16 58.8 8 117 48 -42 45 55 -42 13 22 -42 49 54 -42 9 26 0.81 - 7 0 0 -42 58 57 10 16 59.5 9 116 48 -43 15 16 -42 42 43 -43 19 15 -42 38 46 0.81 - 6 0 0 -43 28 8 10 17 0.2 10 115 48 -43 44 27 -43 11 53 -43 48 26 -43 7 56 0.81 - 5 0 0 -43 57 7 10 17 1.0 11 115 48 -44 13 26 -43 40 52 -44 17 26 -43 36 55 0.82 - 4 0 0 -44 25 53 10 17 1.8 11 114 48 -44 42 13 -44 9 38 -44 46 12 -44 5 41 0.82 - 3 0 0 -44 54 26 10 17 2.7 12 113 49 -45 10 46 -44 38 11 -45 14 45 -44 34 14 0.82 - 2 0 0 -45 22 45 10 17 3.7 13 112 49 -45 39 5 -45 6 30 -45 43 4 -45 2 34 0.82 - 1 0 0 -45 50 50 10 17 4.7 14 112 49 -46 7 9 -45 34 35 -46 11 8 -45 30 38 0.82 0 0 0 -46 18 38 10 17 5.7 15 111 49 -46 34 57 -46 2 24 -46 38 56 -45 58 27 0.82 1 0 0 -46 46 11 10 17 6.8 16 110 49 -47 2 29 -46 29 57 -47 6 28 -46 26 1 0.82 2 0 0 -47 13 27 10 17 8.0 16 109 49 -47 29 44 -46 57 13 -47 33 43 -46 53 17 0.82 3 0 0 -47 40 25 10 17 9.2 17 109 49 -47 56 41 -47 24 12 -48 0 40 -47 20 16 0.82 4 0 0 -48 7 5 10 17 10.4 18 108 49 -48 23 20 -47 50 53 -48 27 19 -47 46 58 0.82 5 0 0 -48 33 26 10 17 11.7 19 107 48 -48 49 40 -48 17 16 -48 53 38 -48 13 20 0.82 6 0 0 -48 59 28 10 17 13.0 19 106 48 -49 15 41 -48 43 19 -49 19 39 -48 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9 30 -42 36 55 -43 13 29 -42 32 58 0.86 180 0 0 -42 23 41 10 22 27.2 19 253 -35 -42 40 0 -42 7 26 -42 43 59 -42 3 29 0.86 -179 0 0 -41 54 1 10 22 28.6 18 252 -36 -42 10 20 -41 37 47 -42 14 19 -41 33 51 0.86 -178 0 0 -41 24 13 10 22 30.0 17 251 -36 -41 40 31 -41 8 0 -41 44 30 -41 4 4 0.86 -177 0 0 -40 54 17 10 22 31.3 16 251 -37 -41 10 34 -40 38 5 -41 14 32 -40 34 9 0.86 -176 0 0 -40 24 14 10 22 32.6 15 250 -38 -40 40 30 -40 8 3 -40 44 28 -40 4 7 0.87 -175 0 0 -39 54 5 10 22 33.8 14 249 -39 -40 10 19 -39 37 54 -40 14 17 -39 33 59 0.87 -174 0 0 -39 23 50 10 22 34.9 14 249 -39 -39 40 4 -39 7 42 -39 44 1 -39 3 46 0.87 -173 0 0 -38 53 32 10 22 36.0 13 248 -40 -39 9 44 -38 37 25 -39 13 41 -38 33 30 0.88 -172 0 0 -38 23 11 10 22 37.0 12 247 -41 -38 39 21 -38 7 5 -38 43 18 -38 3 10 0.88 -171 0 0 -37 52 47 10 22 38.0 11 247 -41 -38 8 56 -37 36 43 -38 12 52 -37 32 49 0.88 -170 0 0 -37 22 23 10 22 38.8 10 246 -42 -37 38 30 -37 6 20 -37 42 26 -37 2 27 0.89 -169 0 0 -36 51 59 10 22 39.6 9 245 -43 -37 8 4 -36 35 58 -37 11 59 -36 32 5 0.90 -168 0 0 -36 21 35 10 22 40.3 8 245 -44 -36 37 38 -36 5 37 -36 41 34 -36 1 44 0.90 -167 0 0 -35 51 14 10 22 41.0 7 244 -44 -36 7 15 -35 35 18 -36 11 10 -35 31 25 0.92 -166 0 0 -35 20 56 10 22 41.5 6 244 -45 -35 36 55 -35 5 2 -35 40 49 -35 1 10 0.93 -165 0 0 -34 50 43 10 22 42.0 5 243 -45 -35 6 39 -34 34 50 -35 10 33 -34 30 59 0.95 -164 0 0 -34 20 34 10 22 42.4 4 242 -46 -34 36 28 -34 4 44 -34 40 21 -34 0 53 0.98 -163 0 0 -33 50 32 10 22 42.7 3 242 -47 -34 6 23 -33 34 44 -34 10 16 -33 30 54 1.02 -162 0 0 -33 20 36 10 22 43.0 2 241 -47 -33 36 26 -33 4 51 -33 40 17 -33 1 2 1.11 -161 0 0 -32 50 49 10 22 43.1 1 241 -48 -33 6 36 -32 35 7 -33 10 27 -32 31 18 1.34 -160 0 0 -32 21 11 10 22 43.2 0 240 -48 -32 36 55 -32 5 31 -32 40 46 -32 1 43 3.44 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 325-151345 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 19 43.6853 DE: -25 04 02.583 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 19 43.6849 DE: -25 04 02.583 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.3 * B mag [mag]: 10.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (435) Ella asteroid class: approx. diameter [km]: 38 approx. diameter ["]: 0.023 distance from Earth [AU]: 2.33240 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#95 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): 0.014", 0.003", 90.95° remarks: * orbital elements for (435)Ella : Mean anomaly = 316.9618070953 deg Arg. of pericenter = 333.4806151672 deg Long. of node = 23.1325139222 deg Inclination = 1.8157970156 deg Eccentricity = 0.1546075284 Semimajor axis = 2.4500057522 AU Perihelion dist = 2.0712164183 AU Mag: H = 10.40, G = 0.15 Epoch of elements : MJD 60600.43043612 TDT (2024 Oct 17.4304) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#952023Apr24,1.36,2024,10,17,10.330473,0.038776,-0.631687,15.994746,0.960384,0.005146,0.000133,0.000000,0.000000 93.9400,-25.0580,21.36,-9.51,False UCAC4 325-151345,18.32880151,-25.0673841,10.71,10.31,10.09,0.1,0,,18.35406478,-25.0579571,4.82,4.59,0,0,0 435,Ella,15.12,38.588,2.3324,0,0,4.438,3.63,,2.0,0 0,316.8512,2024,10,17,333.4806,23.1325,1.8158,0.15461,2.45001,2.07122,10.40,5.0,0.15 1.122,0.0143,0.0026,91,0.0028,Known errors,0.64,0,-1,-1 20241017_151345,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org