IOTA/IOTA-ES occultation update for (98) Ianthe / UCAC4 262-170219 event on 2023 Mar 05, 19:56 UT Visible from SW Australia Summary ------- On 2023 Mar 05 UT, the 108.8 km diameter asteroid (98) Ianthe will occult a 12.0 mag star in the constellation Corona Australis for observers along a path across SW Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.56 mag to 14.41 mag (the magnitude of the asteroid) for at most 3.990 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: 2023 Mar 05, 19:52 - 2023 Mar 05, 20:00 * geocentric midpoint of event [JD]: 2460009.33091037 * magnitude of target star: 11.96 * magnitude drop [mag]: 2.56 * estimated maximum duration [s]: 3.990 * Moon: 97 % sunlit, 129° distance * Sun: 70° distance * rough path description: SW Australia The occultation path -------------------- * approximate projected width [km]: 111 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.010", 84°) * approx speed of asteroid's shadow [km/s]: 27.2839 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 262-170219 by 98 Ianthe on 2023 Mar 5 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 85 0 0 - 0 56 19 19 52 41.5 0 128 -69 - 1 34 32 .. .. .. - 1 50 26 .. .. .. .... 86 0 0 - 1 43 15 19 52 41.5 1 128 -67 - 2 21 37 - 1 5 1 - 2 37 33 - 0 49 11 0.25 87 0 0 - 2 30 35 19 52 41.7 3 128 -66 - 3 9 4 - 1 52 13 - 3 25 4 - 1 36 21 0.23 88 0 0 - 3 18 17 19 52 42.0 4 128 -65 - 3 56 52 - 2 39 48 - 4 12 55 - 2 23 52 0.23 89 0 0 - 4 6 18 19 52 42.4 5 128 -64 - 4 45 0 - 3 27 42 - 5 1 6 - 3 11 44 0.22 90 0 0 - 4 54 37 19 52 43.0 6 127 -63 - 5 33 26 - 4 15 55 - 5 49 34 - 3 59 54 0.22 91 0 0 - 5 43 13 19 52 43.6 8 127 -61 - 6 22 8 - 5 4 25 - 6 38 18 - 4 48 21 0.22 92 0 0 - 6 32 2 19 52 44.4 9 127 -60 - 7 11 3 - 5 53 9 - 7 27 16 - 5 37 3 0.22 93 0 0 - 7 21 4 19 52 45.3 10 127 -59 - 8 0 9 - 6 42 5 - 8 16 25 - 6 25 57 0.22 94 0 0 - 8 10 15 19 52 46.3 12 127 -58 - 8 49 26 - 7 31 12 - 9 5 43 - 7 15 2 0.22 95 0 0 - 8 59 35 19 52 47.4 13 127 -56 - 9 38 49 - 8 20 28 - 9 55 8 - 8 4 16 0.22 96 0 0 - 9 49 0 19 52 48.7 14 127 -55 -10 28 18 - 9 9 49 -10 44 39 - 8 53 36 0.22 97 0 0 -10 38 29 19 52 50.1 15 126 -54 -11 17 50 - 9 59 15 -11 34 12 - 9 43 0 0.22 98 0 0 -11 27 59 19 52 51.5 17 126 -53 -12 7 23 -10 48 42 -12 23 46 -10 32 26 0.22 99 0 0 -12 17 28 19 52 53.1 18 126 -51 -12 56 54 -11 38 9 -13 13 18 -11 21 52 0.22 100 0 0 -13 6 54 19 52 54.8 19 126 -50 -13 46 22 -12 27 33 -14 2 47 -12 11 16 0.22 101 0 0 -13 56 15 19 52 56.6 21 125 -49 -14 35 44 -13 16 53 -14 52 9 -13 0 35 0.22 102 0 0 -14 45 28 19 52 58.6 22 125 -48 -15 24 58 -14 6 6 -15 41 23 -13 49 48 0.22 103 0 0 -15 34 32 19 53 0.6 23 125 -46 -16 14 2 -14 55 10 -16 30 27 -14 38 52 0.22 104 0 0 -16 23 24 19 53 2.7 24 125 -45 -17 2 53 -15 44 2 -17 19 18 -15 27 44 0.22 105 0 0 -17 12 2 19 53 4.9 26 124 -44 -17 51 30 -16 32 41 -18 7 55 -16 16 23 0.21 106 0 0 -18 0 24 19 53 7.2 27 124 -43 -18 39 50 -17 21 4 -18 56 14 -17 4 47 0.21 107 0 0 -18 48 27 19 53 9.6 28 123 -41 -19 27 52 -18 9 10 -19 44 15 -17 52 54 0.21 108 0 0 -19 36 11 19 53 12.1 29 123 -40 -20 15 33 -18 56 56 -20 31 55 -18 40 42 0.21 109 0 0 -20 23 33 19 53 14.7 30 123 -39 -21 2 52 -19 44 21 -21 19 12 -19 28 8 0.21 110 0 0 -21 10 31 19 53 17.3 32 122 -38 -21 49 46 -20 31 23 -22 6 5 -20 15 11 0.21 111 0 0 -21 57 4 19 53 20.0 33 122 -37 -22 36 14 -21 18 0 -22 52 32 -21 1 49 0.21 112 0 0 -22 43 9 19 53 22.8 34 121 -36 -23 22 15 -22 4 10 -23 38 30 -21 48 1 0.21 113 0 0 -23 28 45 19 53 25.6 35 121 -34 -24 7 46 -22 49 51 -24 23 59 -22 33 45 0.21 114 0 0 -24 13 51 19 53 28.6 36 120 -33 -24 52 46 -23 35 2 -25 8 57 -23 18 58 0.21 115 0 0 -24 58 25 19 53 31.5 38 120 -32 -25 37 14 -24 19 42 -25 53 23 -24 3 41 0.21 116 0 0 -25 42 26 19 53 34.6 39 119 -31 -26 21 9 -25 3 50 -26 37 14 -24 47 51 0.21 117 0 0 -26 25 52 19 53 37.6 40 118 -30 -27 4 28 -25 47 23 -27 20 31 -25 31 27 0.21 118 0 0 -27 8 43 19 53 40.7 41 118 -29 -27 47 12 -26 30 21 -28 3 11 -26 14 27 0.21 119 0 0 -27 50 57 19 53 43.9 42 117 -28 -28 29 18 -27 12 42 -28 45 14 -26 56 52 0.21 120 0 0 -28 32 33 19 53 47.1 43 116 -26 -29 10 46 -27 54 26 -29 26 39 -27 38 39 0.21 121 0 0 -29 13 30 19 53 50.3 44 116 -25 -29 51 35 -28 35 32 -30 7 25 -28 19 48 0.21 122 0 0 -29 53 48 19 53 53.6 45 115 -24 -30 31 45 -29 15 58 -30 47 31 -29 0 18 0.21 123 0 0 -30 33 26 19 53 56.9 47 114 -23 -31 11 14 -29 55 45 -31 26 56 -29 40 9 0.21 124 0 0 -31 12 23 19 54 0.2 48 114 -22 -31 50 1 -30 34 51 -32 5 40 -30 19 18 0.21 125 0 0 -31 50 39 19 54 3.5 49 113 -21 -32 28 8 -31 13 16 -32 43 42 -30 57 47 0.21 126 0 0 -32 28 12 19 54 6.9 50 112 -20 -33 5 32 -31 50 59 -33 21 2 -31 35 34 0.21 127 0 0 -33 5 4 19 54 10.3 51 111 -19 -33 42 13 -32 28 0 -33 57 40 -32 12 39 0.21 128 0 0 -33 41 13 19 54 13.6 52 110 -18 -34 18 12 -33 4 19 -34 33 35 -32 49 2 0.21 129 0 0 -34 16 39 19 54 17.0 53 109 -17 -34 53 28 -33 39 55 -35 8 47 -33 24 42 0.21 130 0 0 -34 51 22 19 54 20.4 54 108 -16 -35 28 1 -34 14 48 -35 43 15 -33 59 40 0.21 131 0 0 -35 25 22 19 54 23.8 55 107 -15 -36 1 51 -34 48 58 -36 17 0 -34 33 54 0.21 132 0 0 -35 58 38 19 54 27.2 56 106 -14 -36 34 57 -35 22 25 -36 50 2 -35 7 25 0.21 133 0 0 -36 31 12 19 54 30.6 56 105 -13 -37 7 20 -35 55 9 -37 22 21 -35 40 13 0.21 134 0 0 -37 3 2 19 54 34.0 57 104 -12 -37 39 0 -36 27 10 -37 53 56 -36 12 18 0.21 135 0 0 -37 34 9 19 54 37.4 58 103 -11 -38 9 56 -36 58 27 -38 24 49 -36 43 40 0.21 136 0 0 -38 4 34 19 54 40.8 59 102 -10 -38 40 10 -37 29 2 -38 54 58 -37 14 19 0.21 137 0 0 -38 34 15 19 54 44.1 60 101 -10 -39 9 41 -37 58 54 -39 24 25 -37 44 16 0.21 138 0 0 -39 3 14 19 54 47.5 61 100 -9 -39 38 30 -38 28 4 -39 53 9 -38 13 30 0.21 139 0 0 -39 31 31 19 54 50.8 62 98 -8 -40 6 36 -38 56 31 -40 21 11 -38 42 1 0.21 140 0 0 -39 59 6 19 54 54.2 63 97 -7 -40 34 1 -39 24 17 -40 48 31 -39 9 51 0.21 141 0 0 -40 26 0 19 54 57.5 63 96 -6 -41 0 44 -39 51 20 -41 15 10 -39 36 59 0.21 142 0 0 -40 52 12 19 55 0.8 64 94 -5 -41 26 46 -40 17 42 -41 41 7 -40 3 25 0.21 143 0 0 -41 17 43 19 55 4.1 65 93 -4 -41 52 7 -40 43 24 -42 6 24 -40 29 11 0.21 144 0 0 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-18 29 29 -16 38 24 0.76 Uncertainty in time = +/- 1 secs Prediction of 2023 Jan 12.3 Data for the target star ------------------------ * name: UCAC4 262-170219 * constellation : Corona Australis * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 26 57.6383 DE: -37 43 52.947 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 26 57.6384 DE: -37 43 52.947 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (98) Ianthe asteroid class: approx. diameter [km]: 109 approx. diameter ["]: 0.052 distance from Earth [AU]: 2.88080 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#102 date of fit: 2022 Nov 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): 0.018", 0.010", 84.498° remarks: * orbital elements for (98)Ianthe : Mean anomaly = 81.2195078816 deg Arg. of pericenter = 158.3986449754 deg Long. of node = 353.8965191420 deg Inclination = 15.5760912584 deg Eccentricity = 0.1874671577 Semimajor axis = 2.6872150533 AU Perihelion dist = 2.1834504852 AU Mag: H = 8.95, G = 0.15 Epoch of elements : MJD 60008.83090278 TDT (2023 Mar 05.8309) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1022022Nov25,3.99,2023,3,5,19.941849,-0.035174,-0.195530,15.150633,-2.758946,-0.005385,-0.000788,0.000000,0.000000 174.6990,-37.7169,-116.26,-5.92,False UCAC4 262-170219,18.44934394,-37.7313743,0.00,11.96,0.00,0.0,0,,18.47536651,-37.7168652,2.56,0.00,0,0,0 98,Ianthe,14.41,108.8,2.8808,0,0,3.898,-8.42,,5.2,0 0,81.0336,2023,3,5,158.3986,353.8965,15.5761,0.18747,2.68722,2.18345,8.95,5.0,0.15 1.207,0.0180,0.0100,84,0.0108,Known errors,-1.00,-1,-1,-1 20230305_170219,59956.26 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jan 12, 06:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org