IOTA/IOTA-ES occultation update for (423) Diotima / UCAC4 356-202197 event on 2024 Dec 20, 15:33 UT Visible from Summary ------- On 2024 Dec 20 UT, the 200.679 km diameter asteroid (423) Diotima will occult a 11.2 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.21 mag to 13.30 mag (the magnitude of the asteroid) for at most 6.930 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: 100 * date and approx. time of event: 2024 Dec 20, 15:29 - 2024 Dec 20, 15:36 * geocentric midpoint of event [JD]: 2460665.14793475 * magnitude of target star: 11.24 * magnitude drop [mag]: 2.21 * estimated maximum duration [s]: 6.930 * Moon: 71 % sunlit, 172° distance * Sun: 67° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 218 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.003", 69°) * approx speed of asteroid's shadow [km/s]: 28.9789 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 356-202197 by 423 Diotima on 2024 Dec 20 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 - 73 0 0 - 8 51 52 15 29 38.4 1 109 66 - 9 53 49 - 7 49 26 - 9 59 23 - 7 43 46 .... - 72 0 0 - 9 11 39 15 29 38.5 2 109 67 -10 13 24 - 8 9 26 -10 18 57 - 8 3 47 -0.21 - 71 0 0 - 9 30 45 15 29 38.6 3 109 68 -10 32 17 - 8 28 44 -10 37 49 - 8 23 6 -0.29 - 70 0 0 - 9 49 9 15 29 38.9 4 108 69 -10 50 29 - 8 47 19 -10 56 0 - 8 41 43 -0.33 - 69 0 0 -10 6 50 15 29 39.2 5 108 70 -11 8 0 - 9 5 13 -11 13 30 - 8 59 37 -0.35 - 68 0 0 -10 23 51 15 29 39.6 6 108 71 -11 24 49 - 9 22 24 -11 30 18 - 9 16 49 -0.36 - 67 0 0 -10 40 9 15 29 40.0 7 108 71 -11 40 57 - 9 38 53 -11 46 25 - 9 33 20 -0.37 - 66 0 0 -10 55 46 15 29 40.6 8 108 72 -11 56 24 - 9 54 40 -12 1 51 - 9 49 8 -0.38 - 65 0 0 -11 10 42 15 29 41.2 9 108 73 -12 11 10 -10 9 46 -12 16 36 -10 4 14 -0.38 - 64 0 0 -11 24 56 15 29 41.8 10 107 74 -12 25 15 -10 24 10 -12 30 41 -10 18 39 -0.39 - 63 0 0 -11 38 29 15 29 42.6 11 107 75 -12 38 39 -10 37 52 -12 44 4 -10 32 22 -0.39 - 62 0 0 -11 51 21 15 29 43.4 12 107 75 -12 51 23 -10 50 52 -12 56 47 -10 45 23 -0.39 - 61 0 0 -12 3 32 15 29 44.3 13 107 76 -13 3 26 -11 3 11 -13 8 49 -10 57 42 -0.40 - 60 0 0 -12 15 2 15 29 45.2 14 107 77 -13 14 48 -11 14 48 -13 20 11 -11 9 21 -0.40 - 59 0 0 -12 25 51 15 29 46.3 15 106 77 -13 25 30 -11 25 44 -13 30 52 -11 20 17 -0.40 - 58 0 0 -12 35 59 15 29 47.4 16 106 78 -13 35 32 -11 35 59 -13 40 53 -11 30 33 -0.40 - 57 0 0 -12 45 26 15 29 48.5 17 106 79 -13 44 53 -11 45 33 -13 50 14 -11 40 7 -0.40 - 56 0 0 -12 54 13 15 29 49.7 18 106 79 -13 53 34 -11 54 26 -13 58 54 -11 49 0 -0.40 - 55 0 0 -13 2 19 15 29 51.0 19 106 79 -14 1 35 -12 2 37 -14 6 55 -11 57 12 -0.41 - 54 0 0 -13 9 45 15 29 52.4 20 105 80 -14 8 56 -12 10 8 -14 14 15 -12 4 43 -0.41 - 53 0 0 -13 16 30 15 29 53.8 21 105 80 -14 15 36 -12 16 57 -14 20 56 -12 11 33 -0.41 - 52 0 0 -13 22 35 15 29 55.3 22 105 80 -14 21 37 -12 23 6 -14 26 56 -12 17 43 -0.41 - 51 0 0 -13 27 59 15 29 56.8 23 105 80 -14 26 58 -12 28 34 -14 32 17 -12 23 11 -0.41 - 50 0 0 -13 32 43 15 29 58.4 24 105 80 -14 31 39 -12 33 21 -14 36 58 -12 27 58 -0.41 - 49 0 0 -13 36 47 15 30 0.1 24 105 79 -14 35 41 -12 37 28 -14 40 59 -12 32 5 -0.41 - 48 0 0 -13 40 11 15 30 1.8 25 105 79 -14 39 2 -12 40 53 -14 44 20 -12 35 31 -0.41 - 47 0 0 -13 42 54 15 30 3.6 26 104 79 -14 41 44 -12 43 38 -14 47 1 -12 38 16 -0.41 - 46 0 0 -13 44 57 15 30 5.4 27 104 78 -14 43 46 -12 45 43 -14 49 3 -12 40 20 -0.41 - 45 0 0 -13 46 20 15 30 7.4 28 104 78 -14 45 8 -12 47 6 -14 50 25 -12 41 44 -0.41 - 44 0 0 -13 47 2 15 30 9.3 29 104 77 -14 45 50 -12 47 49 -14 51 7 -12 42 27 -0.41 - 43 0 0 -13 47 4 15 30 11.3 30 104 76 -14 45 52 -12 47 51 -14 51 9 -12 42 29 -0.42 - 42 0 0 -13 46 26 15 30 13.4 31 104 76 -14 45 15 -12 47 12 -14 50 32 -12 41 50 -0.42 - 41 0 0 -13 45 8 15 30 15.6 32 104 75 -14 43 57 -12 45 53 -14 49 15 -12 40 30 -0.42 - 40 0 0 -13 43 9 15 30 17.8 33 104 74 -14 42 0 -12 43 52 -14 47 18 -12 38 30 -0.42 - 39 0 0 -13 40 30 15 30 20.0 34 104 73 -14 39 23 -12 41 11 -14 44 40 -12 35 48 -0.42 - 38 0 0 -13 37 10 15 30 22.4 35 104 73 -14 36 5 -12 37 48 -14 41 23 -12 32 25 -0.42 - 37 0 0 -13 33 9 15 30 24.7 36 104 72 -14 32 8 -12 33 45 -14 37 26 -12 28 22 -0.42 - 36 0 0 -13 28 28 15 30 27.2 37 104 71 -14 27 30 -12 29 0 -14 32 49 -12 23 37 -0.42 - 35 0 0 -13 23 6 15 30 29.7 38 104 70 -14 22 12 -12 23 34 -14 27 31 -12 18 10 -0.42 - 34 0 0 -13 17 3 15 30 32.2 39 104 69 -14 16 13 -12 17 27 -14 21 33 -12 12 3 -0.42 - 33 0 0 -13 10 20 15 30 34.8 40 104 68 -14 9 34 -12 10 38 -14 14 54 -12 5 14 -0.42 - 32 0 0 -13 2 55 15 30 37.5 41 104 67 -14 2 15 -12 3 8 -14 7 35 -11 57 43 -0.42 - 31 0 0 -12 54 49 15 30 40.2 41 104 66 -13 54 15 -11 54 56 -13 59 35 -11 49 30 -0.42 - 30 0 0 -12 46 1 15 30 43.0 42 104 65 -13 45 33 -11 46 2 -13 50 55 -11 40 36 -0.42 - 29 0 0 -12 36 32 15 30 45.8 43 104 65 -13 36 11 -11 36 27 -13 41 33 -11 31 0 -0.42 - 28 0 0 -12 26 22 15 30 48.7 44 104 64 -13 26 8 -11 26 9 -13 31 30 -11 20 41 -0.42 - 27 0 0 -12 15 30 15 30 51.7 45 104 63 -13 15 23 -11 15 9 -13 20 46 -11 9 40 -0.42 - 26 0 0 -12 3 55 15 30 54.7 46 105 62 -13 3 57 -11 3 26 -13 9 21 -10 57 57 -0.42 - 25 0 0 -11 51 39 15 30 57.7 47 105 61 -12 51 49 -10 51 1 -12 57 14 -10 45 31 -0.42 - 24 0 0 -11 38 41 15 31 0.8 48 105 60 -12 39 0 -10 37 54 -12 44 25 -10 32 23 -0.42 - 23 0 0 -11 25 0 15 31 4.0 49 106 59 -12 25 28 -10 24 3 -12 30 55 -10 18 32 -0.42 - 22 0 0 -11 10 37 15 31 7.2 50 106 58 -12 11 15 -10 9 30 -12 16 42 -10 3 57 -0.42 - 21 0 0 -10 55 30 15 31 10.5 51 106 57 -11 56 19 - 9 54 13 -12 1 47 - 9 48 39 -0.42 - 20 0 0 -10 39 41 15 31 13.8 51 107 56 -11 40 41 - 9 38 13 -11 46 10 - 9 32 38 -0.42 - 19 0 0 -10 23 10 15 31 17.2 52 107 55 -11 24 20 - 9 21 30 -11 29 51 - 9 15 54 -0.42 - 18 0 0 -10 5 54 15 31 20.7 53 108 54 -11 7 17 - 9 4 2 -11 12 48 - 8 58 26 -0.42 - 17 0 0 - 9 47 56 15 31 24.2 54 109 53 -10 49 31 - 8 45 51 -10 55 3 - 8 40 13 -0.42 - 16 0 0 - 9 29 14 15 31 27.7 55 109 52 -10 31 1 - 8 26 56 -10 36 35 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14 - 3 36 11 -0.42 - 3 0 0 - 4 19 17 15 32 18.5 64 126 38 - 5 24 26 - 3 13 33 - 5 30 17 - 3 7 35 -0.42 - 2 0 0 - 3 50 16 15 32 22.7 65 128 36 - 4 55 43 - 2 44 14 - 5 1 36 - 2 38 14 -0.42 - 1 0 0 - 3 20 31 15 32 27.0 65 130 35 - 4 26 16 - 2 14 10 - 4 32 11 - 2 8 8 -0.42 0 0 0 - 2 50 2 15 32 31.3 66 132 34 - 3 56 6 - 1 43 22 - 4 2 2 - 1 37 19 -0.42 1 0 0 - 2 18 50 15 32 35.6 66 135 33 - 3 25 12 - 1 11 50 - 3 31 10 - 1 5 45 -0.42 2 0 0 - 1 46 53 15 32 40.0 66 137 32 - 2 53 36 - 0 39 34 - 2 59 35 - 0 33 27 -0.42 3 0 0 - 1 14 14 15 32 44.4 67 140 31 - 2 21 16 - 0 6 35 - 2 27 17 - 0 0 26 -0.42 4 0 0 - 0 40 52 15 32 48.8 67 142 30 - 1 48 13 0 27 8 - 1 54 16 0 33 18 -0.42 5 0 0 - 0 6 47 15 32 53.3 67 145 28 - 1 14 28 1 1 33 - 1 20 33 1 7 45 -0.42 6 0 0 0 28 0 15 32 57.8 67 148 27 - 0 40 1 1 36 40 - 0 46 8 1 42 55 -0.42 7 0 0 1 3 28 15 33 2.3 67 151 26 - 0 4 53 2 12 29 - 0 11 2 2 18 46 -0.42 8 0 0 1 39 37 15 33 6.9 67 153 25 0 30 56 2 49 0 0 24 46 2 55 18 -0.42 9 0 0 2 16 27 15 33 11.4 67 156 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15 35 8.6 46 205 -9 20 40 51 23 14 47 20 33 59 23 21 49 -0.42 37 0 0 22 44 23 15 35 12.2 45 206 -10 21 27 45 24 1 56 21 20 53 24 8 59 -0.42 38 0 0 23 31 20 15 35 15.7 44 207 -11 22 14 35 24 49 0 22 7 42 24 56 3 -0.42 39 0 0 24 18 9 15 35 19.1 42 207 -12 23 1 19 25 35 55 22 54 26 25 42 59 -0.42 40 0 0 25 4 50 15 35 22.5 41 208 -13 23 47 55 26 22 41 23 41 1 26 29 45 -0.42 41 0 0 25 51 20 15 35 25.7 40 209 -14 24 34 21 27 9 14 24 27 27 27 16 19 -0.42 42 0 0 26 37 36 15 35 28.9 39 210 -16 25 20 35 27 55 33 25 13 41 28 2 38 -0.41 43 0 0 27 23 37 15 35 32.0 38 211 -17 26 6 35 28 41 36 25 59 40 28 48 42 -0.41 44 0 0 28 9 22 15 35 34.9 37 211 -18 26 52 19 29 27 21 26 45 24 29 34 26 -0.41 45 0 0 28 54 47 15 35 37.8 36 212 -19 27 37 45 30 12 46 27 30 50 30 19 51 -0.41 46 0 0 29 39 52 15 35 40.6 35 213 -20 28 22 52 30 57 49 28 15 57 31 4 55 -0.41 47 0 0 30 24 35 15 35 43.3 34 214 -21 29 7 37 31 42 29 29 0 42 31 49 34 -0.41 48 0 0 31 8 53 15 35 45.8 32 214 -22 29 51 59 32 26 44 29 45 5 32 33 48 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20 36 -0.41 62 0 0 40 34 39 15 36 12.0 18 224 -35 39 20 10 41 50 0 39 13 29 41 56 51 -0.41 63 0 0 41 10 32 15 36 13.2 17 225 -36 39 56 18 42 25 36 39 49 38 42 32 25 -0.41 64 0 0 41 45 44 15 36 14.3 16 225 -36 40 31 47 43 0 31 40 25 9 43 7 19 -0.41 65 0 0 42 20 17 15 36 15.4 15 226 -37 41 6 37 43 34 47 41 0 0 43 41 33 -0.41 66 0 0 42 54 10 15 36 16.4 14 227 -38 41 40 47 44 8 22 41 34 12 44 15 6 -0.41 67 0 0 43 27 23 15 36 17.3 13 228 -38 42 14 18 44 41 16 42 7 44 44 47 59 -0.41 68 0 0 43 59 55 15 36 18.1 12 228 -39 42 47 8 45 13 29 42 40 36 45 20 11 -0.41 69 0 0 44 31 47 15 36 18.9 12 229 -40 43 19 19 45 45 2 43 12 48 45 51 42 -0.41 70 0 0 45 2 58 15 36 19.6 11 230 -40 43 50 49 46 15 55 43 44 20 46 22 32 -0.41 71 0 0 45 33 30 15 36 20.2 10 230 -41 44 21 39 46 46 6 44 15 12 46 52 42 -0.41 72 0 0 46 3 21 15 36 20.8 9 231 -42 44 51 50 47 15 38 44 45 25 47 22 12 -0.41 73 0 0 46 32 32 15 36 21.3 8 232 -42 45 21 21 47 44 29 45 14 57 47 51 1 -0.41 74 0 0 47 1 4 15 36 21.7 7 233 -43 45 50 12 48 12 40 45 43 50 48 19 11 -0.42 75 0 0 47 28 56 15 36 22.2 6 233 -43 46 18 24 48 40 12 46 12 4 48 46 41 -0.42 76 0 0 47 56 9 15 36 22.5 6 234 -44 46 45 57 49 7 5 46 39 39 49 13 31 -0.42 77 0 0 48 22 43 15 36 22.8 5 235 -45 47 12 51 49 33 19 47 6 34 49 39 43 -0.42 78 0 0 48 48 39 15 36 23.0 4 236 -45 47 39 7 49 58 54 47 32 52 50 5 17 -0.41 79 0 0 49 13 57 15 36 23.2 3 236 -46 48 4 44 50 23 51 47 58 31 50 30 12 -0.41 80 0 0 49 38 36 15 36 23.4 2 237 -46 48 29 44 50 48 10 48 23 32 50 54 29 -0.41 81 0 0 50 2 39 15 36 23.5 2 238 -47 48 54 6 51 11 52 48 47 56 51 18 9 -0.41 82 0 0 50 26 4 15 36 23.6 1 239 -47 49 17 51 51 34 57 49 11 43 51 41 13 -0.41 83 0 0 50 48 53 15 36 23.6 0 239 -47 49 41 0 .. .. .. 49 34 54 .. .. .. -0.40 84 0 0 .. .. .... .. .. .. .. .. .. 50 3 32 .. .. .. 49 57 28 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 356-202197 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 44 57.2854 DE: -18 51 13.696 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 44 57.2850 DE: -18 51 13.698 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (423) Diotima asteroid class: approx. diameter [km]: 201 approx. diameter ["]: 0.084 distance from Earth [AU]: 3.29940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#132 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", 68.773° remarks: * orbital elements for (423)Diotima : Mean anomaly = 80.4223166546 deg Arg. of pericenter = 199.1600890306 deg Long. of node = 69.3499236605 deg Inclination = 11.2428326329 deg Eccentricity = 0.0341428689 Semimajor axis = 3.0665554620 AU Perihelion dist = 2.9618544610 AU Mag: H = 7.36, G = 0.15 Epoch of elements : MJD 60664.64793454 TDT (2024 Dec 20.6479) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1322023Apr24,6.93,2024,12,20,15.550434,-0.203992,0.329962,13.878269,8.656097,0.005259,0.001734,0.000000,0.000000 18.6056,-18.7246,-53.78,-23.44,False UCAC4 356-202197,22.74924599,-18.8538042,11.62,11.24,11.03,0.0,0,,22.77149789,-18.7245997,2.21,2.00,0,0,0 423,Diotima,13.30,200.679,3.2994,0,0,2.604,23.07,,11.4,0 0,80.3034,2024,12,20,199.1601,69.3499,11.2428,0.03414,3.06656,2.96185,7.37,5.0,0.15 1.045,0.0153,0.0025,69,0.0038,Known errors,1.00,0,-1,-1 20241220_202197,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org