IOTA/IOTA-ES occultation update for (435) Ella / UCAC4 324-127553 event on 2024 Oct 09, 02:25 UT Visible from Summary ------- On 2024 Oct 09 UT, the 38.5437995322256 km diameter asteroid (435) Ella will occult a 11.7 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 3.45 mag to 15.07 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: 99 * date and approx. time of event: 2024 Oct 09, 02:21 - 2024 Oct 09, 02:29 * geocentric midpoint of event [JD]: 2460592.60122971 * magnitude of target star: 11.67 * magnitude drop [mag]: 3.45 * estimated maximum duration [s]: 1.510 * Moon: 32 % sunlit, 7° distance * Sun: 75° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.003", 93°) * approx speed of asteroid's shadow [km/s]: 25.6591 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 324-127553 by 435 Ella on 2024 Oct 9 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 128 0 0 - 2 32 27 2 21 37.8 1 115 76 - 2 44 4 - 2 20 51 - 2 47 2 - 2 17 53 .... 129 0 0 - 3 0 50 2 21 37.9 2 115 77 - 3 12 26 - 2 49 14 - 3 15 24 - 2 46 16 0.08 130 0 0 - 3 29 9 2 21 38.2 3 115 78 - 3 40 45 - 3 17 33 - 3 43 43 - 3 14 35 0.06 131 0 0 - 3 57 23 2 21 38.5 4 115 79 - 4 8 59 - 3 45 48 - 4 11 57 - 3 42 50 0.04 132 0 0 - 4 25 32 2 21 38.9 5 115 80 - 4 37 8 - 4 13 57 - 4 40 5 - 4 10 59 0.04 133 0 0 - 4 53 35 2 21 39.4 6 115 81 - 5 5 10 - 4 42 0 - 5 8 8 - 4 39 3 0.03 134 0 0 - 5 21 31 2 21 40.0 8 115 83 - 5 33 6 - 5 9 57 - 5 36 3 - 5 6 59 0.03 135 0 0 - 5 49 20 2 21 40.6 9 115 84 - 6 0 54 - 5 37 46 - 6 3 51 - 5 34 48 0.03 136 0 0 - 6 17 0 2 21 41.4 10 115 85 - 6 28 33 - 6 5 26 - 6 31 31 - 6 2 29 0.02 137 0 0 - 6 44 31 2 21 42.2 11 114 86 - 6 56 4 - 6 32 58 - 6 59 1 - 6 30 1 0.02 138 0 0 - 7 11 52 2 21 43.2 12 114 87 - 7 23 25 - 7 0 20 - 7 26 22 - 6 57 23 0.02 139 0 0 - 7 39 4 2 21 44.2 13 114 87 - 7 50 35 - 7 27 32 - 7 53 32 - 7 24 35 0.02 140 0 0 - 8 6 4 2 21 45.3 14 114 88 - 8 17 35 - 7 54 33 - 8 20 31 - 7 51 36 0.02 141 0 0 - 8 32 52 2 21 46.5 15 114 88 - 8 44 23 - 8 21 22 - 8 47 19 - 8 18 26 0.02 142 0 0 - 8 59 29 2 21 47.8 16 114 87 - 9 10 58 - 8 47 59 - 9 13 54 - 8 45 3 0.02 143 0 0 - 9 25 52 2 21 49.2 17 114 87 - 9 37 21 - 9 14 24 - 9 40 17 - 9 11 28 0.02 144 0 0 - 9 52 2 2 21 50.6 19 113 86 -10 3 30 - 9 40 34 -10 6 25 - 9 37 38 0.02 145 0 0 -10 17 58 2 21 52.2 20 113 85 -10 29 24 -10 6 31 -10 32 20 -10 3 35 0.02 146 0 0 -10 43 39 2 21 53.8 21 113 84 -10 55 4 -10 32 13 -10 58 0 -10 29 17 0.02 147 0 0 -11 9 4 2 21 55.5 22 113 83 -11 20 29 -10 57 39 -11 23 24 -10 54 44 0.02 148 0 0 -11 34 14 2 21 57.2 23 113 82 -11 45 38 -11 22 50 -11 48 33 -11 19 56 0.01 149 0 0 -11 59 8 2 21 59.1 24 113 81 -12 10 31 -11 47 45 -12 13 26 -11 44 50 0.01 150 0 0 -12 23 45 2 22 1.0 25 112 80 -12 35 7 -12 12 23 -12 38 1 -12 9 28 0.01 151 0 0 -12 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66 -17 25 57 -17 3 44 -17 28 48 -17 0 53 0.01 164 0 0 -17 34 48 2 22 34.7 40 109 65 -17 45 54 -17 23 42 -17 48 44 -17 20 52 0.01 165 0 0 -17 54 23 2 22 37.6 41 108 64 -18 5 27 -17 43 18 -18 8 17 -17 40 29 0.01 166 0 0 -18 13 35 2 22 40.4 42 108 63 -18 24 38 -18 2 32 -18 27 28 -17 59 42 0.01 167 0 0 -18 32 24 2 22 43.4 43 108 62 -18 43 26 -18 21 23 -18 46 16 -18 18 33 0.01 168 0 0 -18 50 51 2 22 46.4 44 107 61 -19 1 52 -18 39 50 -19 4 41 -18 37 1 0.01 169 0 0 -19 8 54 2 22 49.4 45 107 60 -19 19 53 -18 57 54 -19 22 42 -18 55 6 0.01 170 0 0 -19 26 33 2 22 52.5 46 107 59 -19 37 32 -19 15 35 -19 40 20 -19 12 47 0.01 171 0 0 -19 43 49 2 22 55.6 47 106 58 -19 54 47 -19 32 52 -19 57 35 -19 30 4 0.01 172 0 0 -20 0 42 2 22 58.8 48 106 57 -20 11 38 -19 49 46 -20 14 25 -19 46 58 0.01 173 0 0 -20 17 10 2 23 2.0 49 106 56 -20 28 5 -20 6 15 -20 30 52 -20 3 28 0.01 174 0 0 -20 33 14 2 23 5.2 50 105 55 -20 44 8 -20 22 20 -20 46 55 -20 19 33 0.01 175 0 0 -20 48 54 2 23 8.5 51 105 54 -20 59 46 -20 38 1 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22 53 0.00 -123 0 0 -23 26 0 2 27 5.4 71 260 -4 -23 36 40 -23 15 19 -23 39 24 -23 12 36 0.00 -122 0 0 -23 15 18 2 27 9.3 70 259 -5 -23 26 0 -23 4 37 -23 28 43 -23 1 53 0.00 -121 0 0 -23 4 12 2 27 13.2 69 259 -6 -23 14 54 -22 53 30 -23 17 38 -22 50 46 0.00 -120 0 0 -22 52 41 2 27 17.0 69 259 -7 -23 3 24 -22 41 58 -23 6 8 -22 39 13 0.00 -119 0 0 -22 40 44 2 27 20.9 68 258 -8 -22 51 28 -22 30 0 -22 54 13 -22 27 16 0.00 -118 0 0 -22 28 23 2 27 24.7 67 258 -9 -22 39 8 -22 17 38 -22 41 53 -22 14 53 0.00 -117 0 0 -22 15 37 2 27 28.6 66 257 -10 -22 26 22 -22 4 51 -22 29 8 -22 2 5 0.00 -116 0 0 -22 2 25 2 27 32.4 65 257 -11 -22 13 12 -21 51 38 -22 15 58 -21 48 53 0.01 -115 0 0 -21 48 49 2 27 36.1 64 257 -11 -21 59 37 -21 38 1 -22 2 23 -21 35 15 0.01 -114 0 0 -21 34 48 2 27 39.9 63 256 -12 -21 45 37 -21 23 59 -21 48 23 -21 21 13 0.01 -113 0 0 -21 20 22 2 27 43.7 62 256 -13 -21 31 13 -21 9 32 -21 33 59 -21 6 46 0.01 -112 0 0 -21 5 32 2 27 47.4 61 256 -14 -21 16 23 -20 54 41 -21 19 10 -20 51 54 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- 99 0 0 -17 16 11 2 28 33.2 48 251 -27 -17 27 18 -17 5 4 -17 30 9 -17 2 14 0.01 - 98 0 0 -16 55 51 2 28 36.5 47 251 -28 -17 6 59 -16 44 42 -17 9 50 -16 41 52 0.01 - 97 0 0 -16 35 8 2 28 39.7 46 251 -29 -16 46 17 -16 23 58 -16 49 8 -16 21 7 0.01 - 96 0 0 -16 14 3 2 28 42.9 45 250 -31 -16 25 14 -16 2 53 -16 28 5 -16 0 1 0.01 - 95 0 0 -15 52 37 2 28 46.0 44 250 -32 -16 3 49 -15 41 26 -16 6 41 -15 38 34 0.01 - 94 0 0 -15 30 50 2 28 49.1 43 250 -33 -15 42 3 -15 19 37 -15 44 55 -15 16 45 0.01 - 93 0 0 -15 8 42 2 28 52.2 42 249 -34 -15 19 57 -14 57 28 -15 22 49 -14 54 36 0.01 - 92 0 0 -14 46 14 2 28 55.2 41 249 -35 -14 57 29 -14 34 59 -15 0 22 -14 32 6 0.01 - 91 0 0 -14 23 26 2 28 58.1 39 249 -36 -14 34 42 -14 12 9 -14 37 35 -14 9 16 0.01 - 90 0 0 -14 0 17 2 29 1.0 38 249 -37 -14 11 35 -13 49 0 -14 14 28 -13 46 6 0.01 - 89 0 0 -13 36 50 2 29 3.8 37 248 -38 -13 48 9 -13 25 31 -13 51 2 -13 22 38 0.01 - 88 0 0 -13 13 4 2 29 6.5 36 248 -39 -13 24 24 -13 1 44 -13 27 17 -12 58 50 0.01 - 87 0 0 -12 48 59 2 29 9.2 35 248 -40 -13 0 20 -12 37 38 -13 3 14 -12 34 44 0.01 - 86 0 0 -12 24 36 2 29 11.9 34 248 -41 -12 35 58 -12 13 14 -12 38 53 -12 10 20 0.01 - 85 0 0 -11 59 56 2 29 14.5 33 248 -42 -12 11 19 -11 48 33 -12 14 14 -11 45 38 0.01 - 84 0 0 -11 34 59 2 29 17.0 32 247 -43 -11 46 23 -11 23 34 -11 49 18 -11 20 39 0.01 - 83 0 0 -11 9 45 2 29 19.4 31 247 -44 -11 21 10 -10 58 20 -11 24 5 -10 55 25 0.01 - 82 0 0 -10 44 15 2 29 21.8 30 247 -45 -10 55 41 -10 32 49 -10 58 37 -10 29 54 0.01 - 81 0 0 -10 18 30 2 29 24.1 29 247 -46 -10 29 57 -10 7 3 -10 32 53 -10 4 7 0.01 - 80 0 0 - 9 52 30 2 29 26.3 28 247 -47 -10 3 58 - 9 41 2 -10 6 54 - 9 38 6 0.01 - 79 0 0 - 9 26 16 2 29 28.5 27 246 -49 - 9 37 45 - 9 14 47 - 9 40 41 - 9 11 51 0.01 - 78 0 0 - 8 59 48 2 29 30.5 26 246 -50 - 9 11 18 - 8 48 19 - 9 14 14 - 8 45 22 0.01 - 77 0 0 - 8 33 7 2 29 32.5 24 246 -51 - 8 44 38 - 8 21 37 - 8 47 34 - 8 18 40 0.01 - 76 0 0 - 8 6 14 2 29 34.5 23 246 -52 - 8 17 45 - 7 54 43 - 8 20 42 - 7 51 46 0.02 - 75 0 0 - 7 39 9 2 29 36.3 22 246 -53 - 7 50 41 - 7 27 37 - 7 53 38 - 7 24 40 0.02 - 74 0 0 - 7 11 53 2 29 38.1 21 246 -54 - 7 23 25 - 7 0 20 - 7 26 23 - 6 57 23 0.02 - 73 0 0 - 6 44 26 2 29 39.8 20 246 -55 - 6 55 59 - 6 32 53 - 6 58 57 - 6 29 56 0.02 - 72 0 0 - 6 16 50 2 29 41.4 19 245 -56 - 6 28 24 - 6 5 16 - 6 31 21 - 6 2 19 0.02 - 71 0 0 - 5 49 4 2 29 42.9 18 245 -57 - 6 0 39 - 5 37 30 - 6 3 36 - 5 34 33 0.02 - 70 0 0 - 5 21 11 2 29 44.3 17 245 -58 - 5 32 46 - 5 9 36 - 5 35 43 - 5 6 38 0.02 - 69 0 0 - 4 53 9 2 29 45.6 16 245 -60 - 5 4 45 - 4 41 34 - 5 7 42 - 4 38 36 0.02 - 68 0 0 - 4 25 1 2 29 46.9 15 245 -61 - 4 36 37 - 4 13 25 - 4 39 35 - 4 10 27 0.02 - 67 0 0 - 3 56 47 2 29 48.1 13 245 -62 - 4 8 23 - 3 45 11 - 4 11 21 - 3 42 13 0.02 - 66 0 0 - 3 28 27 2 29 49.1 12 245 -63 - 3 40 3 - 3 16 50 - 3 43 1 - 3 13 52 0.02 - 65 0 0 - 3 0 2 2 29 50.1 11 245 -64 - 3 11 39 - 2 48 26 - 3 14 37 - 2 45 27 0.02 - 64 0 0 - 2 31 34 2 29 51.0 10 245 -65 - 2 43 11 - 2 19 57 - 2 46 9 - 2 16 59 0.03 - 63 0 0 - 2 3 2 2 29 51.8 9 245 -66 - 2 14 39 - 1 51 25 - 2 17 37 - 1 48 27 0.03 - 62 0 0 - 1 34 28 2 29 52.5 8 245 -67 - 1 46 5 - 1 22 51 - 1 49 4 - 1 19 53 0.03 - 61 0 0 - 1 5 53 2 29 53.1 7 245 -68 - 1 17 30 - 0 54 15 - 1 20 28 - 0 51 17 0.03 - 60 0 0 - 0 37 16 2 29 53.7 6 245 -69 - 0 48 53 - 0 25 39 - 0 51 52 - 0 22 41 0.04 - 59 0 0 - 0 8 40 2 29 54.1 5 245 -71 - 0 20 17 0 2 58 - 0 23 15 0 5 56 0.04 - 58 0 0 0 19 56 2 29 54.4 4 245 -72 0 8 19 0 31 33 0 5 21 0 34 32 0.05 - 57 0 0 0 48 31 2 29 54.7 2 245 -73 0 36 54 1 0 8 0 33 56 1 3 6 0.07 - 56 0 0 1 17 3 2 29 54.8 1 245 -74 1 5 26 1 28 40 1 2 28 1 31 38 0.13 - 55 0 0 1 45 32 2 29 54.9 0 245 -75 1 33 56 1 57 9 1 30 58 2 0 7 0.81 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 324-127553 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 05 22.6079 DE: -25 13 06.684 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 05 22.6079 DE: -25 13 06.684 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 13.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (435) Ella asteroid class: approx. diameter [km]: 39 approx. diameter ["]: 0.024 distance from Earth [AU]: 2.25020 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): 0.015", 0.003", 93.166° remarks: * orbital elements for (435)Ella : Mean anomaly = 314.8231902210 deg Arg. of pericenter = 333.4782825211 deg Long. of node = 23.1327705158 deg Inclination = 1.8157962699 deg Eccentricity = 0.1546117806 Semimajor axis = 2.4500249152 AU Perihelion dist = 2.0712222006 AU Mag: H = 10.40, G = 0.15 Epoch of elements : MJD 60592.10122958 TDT (2024 Oct 09.1012) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#952023Apr24,1.51,2024,10,9,2.429513,-0.000308,-0.002714,14.472249,0.550344,0.005309,0.000022,-0.000001,0.000000 -142.9230,-25.2176,140.37,-6.41,False UCAC4 324-127553,18.08961335,-25.2185233,12.97,11.67,10.97,0.1,0,,18.11493299,-25.2176419,3.45,3.69,0,0,0 435,Ella,15.07,38.707,2.2502,0,0,4.169,2.16,,2.0,0 0,314.7972,2024,10,9,333.4783,23.1328,1.8158,0.15461,2.45002,2.07122,10.40,5.0,0.15 1.128,0.0147,0.0027,93,0.0030,Known errors,0.70,0,-1,-1 20241009_127553,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org