IOTA/IOTA-ES occultation update for (98) Ianthe / UCAC4 258-170770 event on 2023 Sep 19, 16:57 UT Visible from Africa Summary ------- On 2023 Sep 19 UT, the 108.8 km diameter asteroid (98) Ianthe will occult a 11.4 mag star in the constellation Corona Australis for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.16 mag to 14.49 mag (the magnitude of the asteroid) for at most 7.420 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: 2023 Sep 19, 16:50 - 2023 Sep 19, 17:04 * geocentric midpoint of event [JD]: 2460207.20663079 * magnitude of target star: 11.39 * magnitude drop [mag]: 3.16 * estimated maximum duration [s]: 7.420 * Moon: 19 % sunlit, 47° distance * Sun: 98° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 110 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.006, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.006", 0.001", 85°) * approx speed of asteroid's shadow [km/s]: 14.6557 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 258-170770 by 98 Ianthe on 2023 Sep 19 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 - 86 0 0 .. .. .... .. .. .. .. .. .. -24 21 38 .. .. .. -24 26 17 .. .. .. .... - 85 0 0 -24 31 59 16 50 20.8 1 132 62 -25 12 1 -23 51 53 -25 16 37 -23 47 16 .... - 84 0 0 -25 21 27 16 50 21.1 2 132 62 -26 1 8 -24 41 41 -26 5 42 -24 37 6 0.01 - 83 0 0 -26 9 38 16 50 21.6 3 132 61 -26 49 0 -25 30 13 -26 53 31 -25 25 41 -0.03 - 82 0 0 -26 56 35 16 50 22.2 5 131 61 -27 35 36 -26 17 30 -27 40 5 -26 13 0 -0.05 - 81 0 0 -27 42 17 16 50 23.0 6 131 60 -28 20 58 -27 3 32 -28 25 25 -26 59 4 -0.06 - 80 0 0 -28 26 44 16 50 24.0 7 130 60 -29 5 5 -27 48 19 -29 9 30 -27 43 54 -0.07 - 79 0 0 -29 9 58 16 50 25.2 8 130 59 -29 48 0 -28 31 53 -29 52 22 -28 27 30 -0.07 - 78 0 0 -29 51 59 16 50 26.5 9 129 59 -30 29 42 -29 14 14 -30 34 2 -29 9 53 -0.07 - 77 0 0 -30 32 49 16 50 27.9 10 129 58 -31 10 13 -29 55 23 -31 14 31 -29 51 4 -0.08 - 76 0 0 -31 12 28 16 50 29.5 11 128 57 -31 49 33 -30 35 21 -31 53 49 -30 31 4 -0.08 - 75 0 0 -31 50 57 16 50 31.2 12 128 57 -32 27 44 -31 14 8 -32 31 57 -31 9 54 -0.08 - 74 0 0 -32 28 18 16 50 33.0 13 127 56 -33 4 46 -31 51 47 -33 8 58 -31 47 35 -0.08 - 73 0 0 -33 4 31 16 50 34.9 15 127 56 -33 40 41 -32 28 18 -33 44 51 -32 24 8 -0.09 - 72 0 0 -33 39 37 16 50 37.0 16 126 55 -34 15 30 -33 3 42 -34 19 37 -32 59 33 -0.09 - 71 0 0 -34 13 38 16 50 39.1 17 126 54 -34 49 14 -33 38 0 -34 53 19 -33 33 54 -0.09 - 70 0 0 -34 46 35 16 50 41.4 18 125 54 -35 21 54 -34 11 13 -35 25 57 -34 7 9 -0.09 - 69 0 0 -35 18 28 16 50 43.7 19 124 53 -35 53 31 -34 43 23 -35 57 33 -34 39 21 -0.09 - 68 0 0 -35 49 20 16 50 46.2 19 124 52 -36 24 6 -35 14 31 -36 28 6 -35 10 30 -0.09 - 67 0 0 -36 19 11 16 50 48.7 20 123 52 -36 53 42 -35 44 37 -36 57 40 -35 40 38 -0.09 - 66 0 0 -36 48 2 16 50 51.3 21 123 51 -37 22 17 -36 13 43 -37 26 14 -36 9 46 -0.09 - 65 0 0 -37 15 54 16 50 53.9 22 122 50 -37 49 55 -36 41 50 -37 53 50 -36 37 55 -0.10 - 64 0 0 -37 42 49 16 50 56.7 23 122 50 -38 16 35 -37 9 0 -38 20 28 -37 5 6 -0.10 - 63 0 0 -38 8 47 16 50 59.5 24 121 49 -38 42 20 -37 35 12 -38 46 11 -37 31 20 -0.10 - 62 0 0 -38 33 50 16 51 2.3 25 120 49 -39 7 9 -38 0 29 -39 10 59 -37 56 38 -0.10 - 61 0 0 -38 57 59 16 51 5.3 26 120 48 -39 31 5 -38 24 51 -39 34 54 -38 21 2 -0.10 - 60 0 0 -39 21 15 16 51 8.2 27 119 47 -39 54 8 -38 48 19 -39 57 55 -38 44 32 -0.10 - 59 0 0 -39 43 38 16 51 11.3 28 118 47 -40 16 19 -39 10 55 -40 20 5 -39 7 9 -0.10 - 58 0 0 -40 5 10 16 51 14.4 29 118 46 -40 37 39 -39 32 39 -40 41 23 -39 28 54 -0.10 - 57 0 0 -40 25 52 16 51 17.5 29 117 45 -40 58 10 -39 53 32 -41 1 52 -39 49 49 -0.10 - 56 0 0 -40 45 44 16 51 20.7 30 117 45 -41 17 51 -40 13 36 -41 21 32 -40 9 54 -0.10 - 55 0 0 -41 4 48 16 51 24.0 31 116 44 -41 36 44 -40 32 50 -41 40 24 -40 29 9 -0.10 - 54 0 0 -41 23 4 16 51 27.3 32 115 43 -41 54 50 -40 51 17 -41 58 29 -40 47 37 -0.10 - 53 0 0 -41 40 34 16 51 30.6 33 115 43 -42 12 9 -41 8 56 -42 15 47 -41 5 17 -0.10 - 52 0 0 -41 57 17 16 51 34.0 33 114 42 -42 28 43 -41 25 49 -42 32 20 -41 22 11 -0.10 - 51 0 0 -42 13 15 16 51 37.4 34 113 42 -42 44 32 -41 41 56 -42 48 8 -41 38 19 -0.10 - 50 0 0 -42 28 28 16 51 40.8 35 113 41 -42 59 37 -41 57 18 -43 3 12 -41 53 43 -0.10 - 49 0 0 -42 42 58 16 51 44.3 36 112 40 -43 13 58 -42 11 56 -43 17 32 -42 8 22 -0.11 - 48 0 0 -42 56 45 16 51 47.9 37 112 40 -43 27 37 -42 25 50 -43 31 10 -42 22 17 -0.11 - 47 0 0 -43 9 48 16 51 51.4 37 111 39 -43 40 33 -42 39 2 -43 44 5 -42 35 29 -0.11 - 46 0 0 -43 22 10 16 51 55.0 38 110 39 -43 52 48 -42 51 31 -43 56 19 -42 47 59 -0.11 - 45 0 0 -43 33 51 16 51 58.7 39 110 38 -44 4 22 -43 3 19 -44 7 52 -42 59 48 -0.11 - 44 0 0 -43 44 51 16 52 2.4 40 109 37 -44 15 15 -43 14 25 -44 18 45 -43 10 55 -0.11 - 43 0 0 -43 55 11 16 52 6.1 40 108 37 -44 25 29 -43 24 51 -44 28 58 -43 21 21 -0.11 - 42 0 0 -44 4 50 16 52 9.8 41 108 36 -44 35 3 -43 34 36 -44 38 31 -43 31 7 -0.11 - 41 0 0 -44 13 51 16 52 13.6 42 107 36 -44 43 58 -43 43 42 -44 47 26 -43 40 13 -0.11 - 40 0 0 -44 22 12 16 52 17.4 43 106 35 -44 52 15 -43 52 8 -44 55 42 -43 48 40 -0.11 - 39 0 0 -44 29 55 16 52 21.3 43 106 34 -44 59 53 -43 59 56 -45 3 20 -43 56 28 -0.11 - 38 0 0 -44 37 0 16 52 25.2 44 105 34 -45 6 54 -44 7 4 -45 10 20 -44 3 38 -0.11 - 37 0 0 -44 43 27 16 52 29.1 45 105 33 -45 13 17 -44 13 35 -45 16 43 -44 10 9 -0.11 - 36 0 0 -44 49 16 16 52 33.1 46 104 33 -45 19 3 -44 19 28 -45 22 28 -44 16 2 -0.11 - 35 0 0 -44 54 28 16 52 37.1 46 103 32 -45 24 12 -44 24 43 -45 27 37 -44 21 17 -0.11 - 34 0 0 -44 59 3 16 52 41.1 47 103 31 -45 28 44 -44 29 20 -45 32 9 -44 25 55 -0.11 - 33 0 0 -45 3 1 16 52 45.2 48 102 31 -45 32 39 -44 33 21 -45 36 4 -44 29 56 -0.11 - 32 0 0 -45 6 22 16 52 49.3 48 101 30 -45 35 59 -44 36 44 -45 39 23 -44 33 19 -0.11 - 31 0 0 -45 9 7 16 52 53.4 49 101 30 -45 38 42 -44 39 30 -45 42 6 -44 36 6 -0.11 - 30 0 0 -45 11 15 16 52 57.6 50 100 29 -45 40 49 -44 41 40 -45 44 13 -44 38 16 -0.11 - 29 0 0 -45 12 47 16 53 1.8 51 100 28 -45 42 20 -44 43 13 -45 45 44 -44 39 49 -0.11 - 28 0 0 -45 13 43 16 53 6.1 51 99 28 -45 43 15 -44 44 9 -45 46 39 -44 40 45 -0.11 - 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15 0 1 -44 30 16 16 54 5.8 60 92 20 -45 0 15 -44 0 15 -45 3 42 -43 56 48 -0.12 - 14 0 1 -44 22 33 16 54 10.7 61 92 19 -44 52 36 -43 52 27 -44 56 4 -43 49 0 -0.12 - 13 0 1 -44 14 10 16 54 15.7 62 91 19 -44 44 19 -43 44 0 -44 47 47 -43 40 31 -0.12 - 12 0 1 -44 5 9 16 54 20.8 63 91 18 -44 35 22 -43 34 53 -44 38 51 -43 31 23 -0.12 - 11 0 1 -43 55 27 16 54 26.0 63 91 17 -44 25 46 -43 25 5 -44 29 16 -43 21 35 -0.12 - 10 0 1 -43 45 4 16 54 31.2 64 90 17 -44 15 30 -43 14 36 -44 19 0 -43 11 6 -0.12 - 9 0 1 -43 34 1 16 54 36.4 65 90 16 -44 4 33 -43 3 26 -44 8 4 -42 59 55 -0.12 - 8 0 1 -43 22 16 16 54 41.8 66 90 15 -43 52 55 -42 51 34 -43 56 27 -42 48 2 -0.12 - 7 0 1 -43 9 48 16 54 47.2 66 89 15 -43 40 35 -42 38 59 -43 44 8 -42 35 26 -0.12 - 6 0 1 -42 56 38 16 54 52.7 67 89 14 -43 27 33 -42 25 41 -43 31 6 -42 22 7 -0.12 - 5 0 1 -42 42 44 16 54 58.2 68 89 13 -43 13 47 -42 11 38 -43 17 21 -42 8 4 -0.12 - 4 0 1 -42 28 6 16 55 3.9 69 89 13 -42 59 17 -41 56 52 -43 2 53 -41 53 16 -0.12 - 3 0 1 -42 12 42 16 55 9.6 69 89 12 -42 44 3 -41 41 19 -42 47 40 -41 37 42 -0.12 - 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9 35 30 -11 13 15 - 9 30 10 -0.10 45 0 0 - 9 10 12 17 1 43.8 54 212 -32 - 9 56 42 - 8 23 35 -10 2 3 - 8 18 13 -0.10 46 0 0 - 7 57 31 17 1 53.5 52 212 -33 - 8 44 20 - 7 10 35 - 8 49 43 - 7 5 11 -0.10 47 0 0 - 6 43 48 17 2 3.1 51 212 -34 - 7 30 55 - 5 56 34 - 7 36 21 - 5 51 8 -0.10 48 0 0 - 5 29 8 17 2 12.6 49 212 -35 - 6 16 33 - 4 41 38 - 6 22 0 - 4 36 9 -0.10 49 0 0 - 4 13 36 17 2 21.9 48 212 -36 - 5 1 16 - 3 25 50 - 5 6 45 - 3 20 20 -0.10 50 0 0 - 2 57 18 17 2 31.0 46 212 -37 - 3 45 12 - 2 9 17 - 3 50 43 - 2 3 45 -0.10 51 0 0 - 1 40 18 17 2 39.9 44 213 -38 - 2 28 25 - 0 52 4 - 2 33 57 - 0 46 30 -0.09 52 0 0 - 0 22 43 17 2 48.6 43 213 -39 - 1 11 2 0 25 43 - 1 16 35 0 31 18 -0.09 53 0 0 0 55 21 17 2 57.1 41 213 -40 0 6 52 1 43 57 0 1 18 1 49 33 -0.09 54 0 0 2 13 48 17 3 5.3 39 213 -41 1 25 10 3 2 32 1 19 35 3 8 9 -0.09 55 0 0 3 32 30 17 3 13.2 38 213 -42 2 43 46 4 21 22 2 38 10 4 26 59 -0.09 56 0 0 4 51 22 17 3 20.8 36 213 -43 4 2 32 5 40 19 3 56 55 5 45 57 -0.09 57 0 0 6 10 16 17 3 28.2 34 214 -44 5 21 23 6 59 16 5 15 46 7 4 55 -0.09 58 0 0 7 29 6 17 3 35.2 33 214 -45 6 40 11 8 18 8 6 34 33 8 23 47 -0.09 59 0 0 8 47 45 17 3 41.9 31 214 -45 7 58 49 9 36 47 7 53 12 9 42 26 -0.09 60 0 0 10 6 6 17 3 48.2 30 214 -46 9 17 12 10 55 7 9 11 34 11 0 45 -0.09 61 0 0 11 24 3 17 3 54.2 28 215 -47 10 35 12 12 13 0 10 29 35 12 18 39 -0.09 62 0 0 12 41 29 17 3 59.9 26 215 -47 11 52 43 13 30 22 11 47 6 13 36 0 -0.09 63 0 0 13 58 19 17 4 5.2 25 215 -48 13 9 38 14 47 5 13 4 3 14 52 42 -0.09 64 0 0 15 14 26 17 4 10.1 23 215 -49 14 25 53 16 3 5 14 20 18 16 8 41 -0.09 65 0 0 16 29 45 17 4 14.7 21 216 -49 15 41 22 17 18 15 15 35 48 17 23 50 -0.09 66 0 0 17 44 12 17 4 18.9 20 216 -49 16 55 59 18 32 30 16 50 26 18 38 4 -0.09 67 0 0 18 57 40 17 4 22.8 18 216 -50 18 9 39 19 45 47 18 4 8 19 51 19 -0.09 68 0 0 20 10 6 17 4 26.3 17 217 -50 19 22 18 20 58 0 19 16 49 21 3 31 -0.08 69 0 0 21 21 26 17 4 29.5 15 217 -50 20 33 53 22 9 5 20 28 25 22 14 35 -0.08 70 0 0 22 31 36 17 4 32.4 14 217 -50 21 44 18 23 19 0 21 38 52 23 24 27 -0.08 71 0 0 23 40 33 17 4 34.9 12 218 -51 22 53 32 24 27 40 22 48 7 24 33 6 -0.08 72 0 0 24 48 15 17 4 37.1 11 218 -51 24 1 30 25 35 4 23 56 8 25 40 28 -0.08 73 0 0 25 54 38 17 4 39.0 9 219 -51 25 8 11 26 41 9 25 2 51 26 46 31 -0.08 74 0 0 26 59 40 17 4 40.7 8 219 -51 26 13 33 27 45 53 26 8 15 27 51 12 -0.08 75 0 0 28 3 21 17 4 42.0 7 220 -51 27 17 33 28 49 14 27 12 17 28 54 31 -0.08 76 0 0 29 5 38 17 4 43.1 5 220 -51 28 20 11 29 51 11 28 14 57 29 56 25 -0.07 77 0 0 30 6 31 17 4 43.9 4 221 -50 29 21 24 30 51 43 29 16 13 30 56 55 -0.06 78 0 0 31 5 59 17 4 44.4 3 221 -50 30 21 13 31 50 49 30 16 4 31 55 59 -0.05 79 0 0 32 4 1 17 4 44.7 1 222 -50 31 19 36 32 48 30 31 14 30 32 53 37 -0.01 80 0 0 33 0 37 17 4 44.8 0 222 -50 32 16 35 .. .. .. 32 11 31 .. .. .. 0.91 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 258-170770 * constellation : Corona Australis * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 20 41.7044 DE: -38 28 30.141 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 20 41.7043 DE: -38 28 30.141 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (98) Ianthe asteroid class: approx. diameter [km]: 109 approx. diameter ["]: 0.055 distance from Earth [AU]: 2.72940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#106 date of fit: 2023 Aug 25 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): 0.006", 0.001", 85.055° remarks: * orbital elements for (98)Ianthe : Mean anomaly = 125.5584609921 deg Arg. of pericenter = 158.3457410335 deg Long. of node = 353.8925055150 deg Inclination = 15.5762939267 deg Eccentricity = 0.1875351856 Semimajor axis = 2.6867156716 AU Perihelion dist = 2.1828619496 AU Mag: H = 9.01, G = 0.15 Epoch of elements : MJD 60206.70659722 TDT (2023 Sep 19.7066) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1062023Aug25,7.42,2023,9,19,16.959139,-0.068980,0.090006,6.567764,5.029120,0.005707,0.000433,0.000000,0.000000 22.8536,-38.4666,-75.93,1.39,False UCAC4 258-170770,18.34491791,-38.4750390,0.00,11.39,0.00,0.0,0,,18.37203654,-38.4666001,3.16,0.00,0,0,0 98,Ianthe,14.49,108.800,2.7294,0,0,1.802,16.20,,5.2,0 0,125.4003,2023,9,19,158.3457,353.8925,15.5763,0.18754,2.68672,2.18286,8.93,5.0,0.15 1.058,0.0057,0.0010,85,0.0058,Known errors,-1.00,0,-1,-1 20230919_170770,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org