IOTA/IOTA-ES occultation update for (98) Ianthe / HIP 91578 event on 2023 Jul 08, 05:21 UT Visible from South America, Central America Summary ------- On 2023 Jul 08 UT, the 108.8 km diameter asteroid (98) Ianthe will occult a 9.4 mag star in the constellation Telescopium for observers along a path across South America, Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.92 mag to 13.32 mag (the magnitude of the asteroid) for at most 8.460 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 Jul 08, 05:16 - 2023 Jul 08, 05:27 * geocentric midpoint of event [JD]: 2460133.72336633 * magnitude of target star: 9.43 * magnitude drop [mag]: 3.92 * estimated maximum duration [s]: 8.460 * Moon: 71 % sunlit, 74° distance * Sun: 156° distance * rough path description: South America, Central America The occultation path -------------------- * approximate projected width [km]: 176 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.017) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.016", 82°) * approx speed of asteroid's shadow [km/s]: 12.8661 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 91578 by 98 Ianthe on 2023 Jul 8 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 -127 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 36 40 58 .... -126 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 35 54 17 .. .. .. 35 7 23 .... -125 0 0 36 5 4 5 26 44.5 1 155 -18 .. .. .. 34 22 49 .. .. .. 33 38 15 .... -124 0 0 34 32 44 5 26 43.5 3 155 -20 36 17 50 32 55 40 37 9 38 32 13 9 -0.86 -123 0 0 33 5 2 5 26 41.9 5 156 -21 34 44 31 31 32 27 35 33 11 30 51 43 -1.02 -122 0 0 31 41 32 5 26 39.7 6 156 -23 33 16 11 30 12 52 34 2 14 29 33 43 -1.10 -121 0 0 30 21 49 5 26 37.0 8 157 -24 31 52 18 28 56 38 32 36 6 28 18 53 -1.15 -120 0 0 29 5 38 5 26 33.8 10 157 -26 30 32 26 27 43 31 31 14 17 27 7 3 -1.18 -119 0 0 27 52 41 5 26 30.1 11 158 -27 29 16 14 26 33 21 29 56 23 25 58 1 -1.20 -118 0 0 26 42 47 5 26 26.0 12 158 -29 28 3 26 25 25 57 28 42 4 24 51 40 -1.21 -117 0 0 25 35 45 5 26 21.6 14 159 -30 26 53 47 24 21 11 27 31 4 23 47 51 -1.22 -116 0 0 24 31 24 5 26 16.8 15 159 -32 25 47 5 23 18 55 26 23 9 22 46 27 -1.23 -115 0 0 23 29 38 5 26 11.6 16 160 -33 24 43 9 22 19 1 25 18 9 21 47 22 -1.24 -114 0 0 22 30 18 5 26 6.2 18 160 -34 23 41 52 21 21 26 24 15 52 20 50 30 -1.25 -113 0 0 21 33 17 5 26 0.5 19 161 -36 22 43 4 20 26 1 23 16 9 19 55 47 -1.25 -112 0 0 20 38 31 5 25 54.6 20 162 -37 21 46 38 19 32 44 22 18 54 19 3 7 -1.25 -111 0 0 19 45 53 5 25 48.4 21 162 -38 20 52 29 18 41 28 21 23 59 18 12 27 -1.26 -110 0 0 18 55 18 5 25 42.1 22 163 -39 20 0 30 17 52 10 20 31 19 17 23 42 -1.26 -109 0 0 18 6 43 5 25 35.5 23 163 -41 19 10 37 17 4 46 19 40 47 16 36 49 -1.26 -108 0 0 17 20 4 5 25 28.7 24 164 -42 18 22 45 16 19 13 18 52 19 15 51 44 -1.26 -107 0 0 16 35 16 5 25 21.8 25 164 -43 17 36 50 15 35 26 18 5 51 15 8 24 -1.26 -106 0 0 15 52 16 5 25 14.7 26 165 -44 16 52 47 14 53 24 17 21 17 14 26 47 -1.27 -105 0 0 15 11 1 5 25 7.5 27 166 -45 16 10 34 14 13 3 16 38 35 13 46 50 -1.27 -104 0 0 14 31 29 5 25 0.2 28 166 -46 15 30 6 13 34 21 15 57 41 13 8 30 -1.27 -103 0 0 13 53 35 5 24 52.7 29 167 -47 14 51 22 12 57 15 15 18 31 12 31 44 -1.27 -102 0 0 13 17 19 5 24 45.1 29 168 -48 14 14 18 12 21 43 14 41 4 11 56 31 -1.27 -101 0 0 12 42 37 5 24 37.5 30 168 -49 13 38 51 11 47 42 14 5 15 11 22 49 -1.27 -100 0 0 12 9 27 5 24 29.7 31 169 -50 13 4 59 11 15 11 13 31 3 10 50 35 -1.27 - 99 0 0 11 37 47 5 24 21.9 32 170 -51 12 32 40 10 44 8 12 58 25 10 19 48 -1.27 - 98 0 0 11 7 36 5 24 13.9 32 170 -52 12 1 53 10 14 31 12 27 20 9 50 26 -1.27 - 97 0 0 10 38 51 5 24 5.9 33 171 -53 11 32 33 9 46 18 11 57 44 9 22 27 -1.27 - 96 0 0 10 11 31 5 23 57.9 33 172 -54 11 4 41 9 19 28 11 29 36 8 55 50 -1.27 - 95 0 0 9 45 34 5 23 49.8 34 173 -54 10 38 14 8 53 59 11 2 55 8 30 34 -1.27 - 94 0 0 9 20 59 5 23 41.6 35 173 -55 10 13 11 8 29 50 10 37 38 8 6 36 -1.27 - 93 0 0 8 57 44 5 23 33.4 35 174 -56 9 49 30 8 7 0 10 13 45 7 43 57 -1.27 - 92 0 0 8 35 48 5 23 25.2 35 175 -57 9 27 11 7 45 27 9 51 13 7 22 34 -1.27 - 91 0 0 8 15 11 5 23 16.9 36 176 -57 9 6 10 7 25 11 9 30 2 7 2 27 -1.27 - 90 0 0 7 55 50 5 23 8.6 36 177 -58 8 46 29 7 6 10 9 10 10 6 43 35 -1.27 - 89 0 0 7 37 45 5 23 0.3 37 177 -59 8 28 4 6 48 23 8 51 36 6 25 56 -1.27 - 88 0 0 7 20 55 5 22 51.9 37 178 -59 8 10 56 6 31 50 8 34 20 6 9 30 -1.27 - 87 0 0 7 5 18 5 22 43.6 37 179 -60 7 55 4 6 16 29 8 18 19 5 54 16 -1.27 - 86 0 0 6 50 55 5 22 35.2 37 180 -60 7 40 26 6 2 20 8 3 34 5 40 14 -1.27 - 85 0 0 6 37 45 5 22 26.8 38 181 -60 7 27 2 5 49 22 7 50 4 5 27 22 -1.27 - 84 0 0 6 25 46 5 22 18.4 38 182 -61 7 14 51 5 37 35 7 37 47 5 15 40 -1.27 - 83 0 0 6 14 59 5 22 10.1 38 183 -61 7 3 52 5 26 58 7 26 43 5 5 7 -1.27 - 82 0 0 6 5 22 5 22 1.7 38 183 -61 6 54 6 5 17 31 7 16 52 4 55 44 -1.27 - 81 0 0 5 56 55 5 21 53.3 38 184 -62 6 45 31 5 9 12 7 8 13 4 47 29 -1.27 - 80 0 0 5 49 39 5 21 44.9 38 185 -62 6 38 7 5 2 2 7 0 46 4 40 22 -1.27 - 79 0 0 5 43 31 5 21 36.6 38 186 -62 6 31 53 4 56 0 6 54 29 4 34 23 -1.27 - 78 0 0 5 38 33 5 21 28.2 38 187 -62 6 26 51 4 51 7 6 49 24 4 29 31 -1.27 - 77 0 0 5 34 44 5 21 19.9 38 188 -62 6 22 58 4 47 21 6 45 30 4 25 47 -1.27 - 76 0 0 5 32 4 5 21 11.6 38 189 -62 6 20 15 4 44 43 6 42 45 4 23 10 -1.27 - 75 0 0 5 30 32 5 21 3.3 38 189 -62 6 18 42 4 43 13 6 41 12 4 21 40 -1.27 - 74 0 0 5 30 9 5 20 55.1 38 190 -62 6 18 19 4 42 50 6 40 49 4 21 17 -1.27 - 73 0 0 5 30 55 5 20 46.9 38 191 -61 6 19 6 4 43 35 6 41 36 4 22 2 -1.27 - 72 0 0 5 32 50 5 20 38.7 37 192 -61 6 21 3 4 45 28 6 43 34 4 23 54 -1.27 - 71 0 0 5 35 53 5 20 30.6 37 193 -61 6 24 10 4 48 28 6 46 43 4 26 53 -1.27 - 70 0 0 5 40 6 5 20 22.4 37 193 -61 6 28 26 4 52 36 6 51 1 4 30 59 -1.27 - 69 0 0 5 45 27 5 20 14.4 37 194 -60 6 33 54 4 57 52 6 56 32 4 36 13 -1.28 - 68 0 0 5 51 58 5 20 6.4 36 195 -60 6 40 32 5 4 17 7 3 13 4 42 35 -1.28 - 67 0 0 5 59 39 5 19 58.4 36 196 -59 6 48 21 5 11 50 7 11 6 4 50 4 -1.28 - 66 0 0 6 8 31 5 19 50.5 35 196 -59 6 57 22 5 20 33 7 20 11 4 58 43 -1.28 - 65 0 0 6 18 33 5 19 42.6 35 197 -58 7 7 34 5 30 25 7 30 29 5 8 31 -1.28 - 64 0 0 6 29 47 5 19 34.8 34 198 -58 7 19 0 5 41 27 7 42 0 5 19 28 -1.28 - 63 0 0 6 42 12 5 19 27.1 34 199 -57 7 31 39 5 53 40 7 54 46 5 31 36 -1.28 - 62 0 0 6 55 51 5 19 19.5 33 199 -56 7 45 32 6 7 5 8 8 46 5 44 54 -1.28 - 61 0 0 7 10 43 5 19 11.9 33 200 -56 8 0 40 6 21 42 8 24 1 5 59 24 -1.28 - 60 0 0 7 26 49 5 19 4.4 32 201 -55 8 17 3 6 37 31 8 40 33 6 15 6 -1.29 - 59 0 0 7 44 10 5 18 56.9 32 201 -54 8 34 43 6 54 34 8 58 23 6 32 2 -1.29 - 58 0 0 8 2 47 5 18 49.6 31 202 -54 8 53 41 7 12 52 9 17 31 6 50 11 -1.29 - 57 0 0 8 22 41 5 18 42.3 30 202 -53 9 13 58 7 32 26 9 37 58 7 9 35 -1.29 - 56 0 0 8 43 54 5 18 35.2 30 203 -52 9 35 35 7 53 16 9 59 46 7 30 15 -1.29 - 55 0 0 9 6 26 5 18 28.1 29 203 -51 9 58 33 8 15 24 10 22 56 7 52 12 -1.29 - 54 0 0 9 30 19 5 18 21.2 28 204 -50 10 22 53 8 38 51 10 47 30 8 15 28 -1.30 - 53 0 0 9 55 35 5 18 14.4 27 205 -49 10 48 38 9 3 38 11 13 30 8 40 3 -1.30 - 52 0 0 10 22 14 5 18 7.7 27 205 -48 11 15 49 9 29 48 11 40 56 9 6 0 -1.30 - 51 0 0 10 50 18 5 18 1.1 26 206 -47 11 44 27 9 57 20 12 9 50 9 33 18 -1.30 - 50 0 0 11 19 49 5 17 54.7 25 206 -46 12 14 35 10 26 18 12 40 16 10 2 1 -1.30 - 49 0 0 11 50 50 5 17 48.4 24 207 -45 12 46 14 10 56 42 13 12 14 10 32 9 -1.31 - 48 0 0 12 23 21 5 17 42.3 23 207 -44 13 19 26 11 28 34 13 45 47 11 3 45 -1.31 - 47 0 0 12 57 25 5 17 36.3 22 208 -43 13 54 15 12 1 57 14 20 57 11 36 49 -1.31 - 46 0 0 13 33 4 5 17 30.5 21 208 -42 14 30 42 12 36 53 14 57 47 12 11 26 -1.31 - 45 0 0 14 10 22 5 17 24.9 20 208 -41 15 8 50 13 13 23 15 36 20 12 47 35 -1.32 - 44 0 0 14 49 19 5 17 19.5 19 209 -40 15 48 42 13 51 30 16 16 38 13 25 21 -1.32 - 43 0 0 15 30 0 5 17 14.3 18 209 -39 16 30 21 14 31 18 16 58 46 14 4 45 -1.32 - 42 0 0 16 12 27 5 17 9.3 17 210 -38 17 13 51 15 12 47 17 42 46 14 45 49 -1.33 - 41 0 0 16 56 44 5 17 4.6 16 210 -37 17 59 14 15 56 2 18 28 43 15 28 38 -1.33 - 40 0 0 17 42 53 5 17 0.1 15 210 -35 18 46 36 16 41 6 19 16 40 16 13 13 -1.33 - 39 0 0 18 30 59 5 16 55.8 14 211 -34 19 36 0 17 28 1 20 6 43 16 59 38 -1.34 - 38 0 0 19 21 7 5 16 51.9 13 211 -33 20 27 31 18 16 52 20 58 56 17 47 56 -1.35 - 37 0 0 20 13 19 5 16 48.2 11 212 -32 21 21 14 19 7 43 21 53 24 18 38 11 -1.35 - 36 0 0 21 7 42 5 16 44.9 10 212 -30 22 17 16 20 0 37 22 50 15 19 30 27 -1.36 - 35 0 0 22 4 21 5 16 41.9 9 213 -29 23 15 42 20 55 40 23 49 35 20 24 49 -1.37 - 34 0 0 23 3 22 5 16 39.3 7 213 -28 24 16 40 21 52 57 24 51 32 21 21 22 -1.38 - 33 0 0 24 4 51 5 16 37.1 6 213 -26 25 20 17 22 52 33 25 56 15 22 20 10 -1.41 - 32 0 0 25 8 56 5 16 35.3 5 214 -25 26 26 44 23 54 34 27 3 53 23 21 19 -1.44 - 31 0 0 26 15 46 5 16 33.9 3 214 -23 27 36 9 24 59 8 28 14 39 24 24 56 -1.50 - 30 0 0 27 25 30 5 16 33.0 2 215 -22 28 48 47 26 6 23 29 28 47 25 31 8 -1.66 - 29 0 0 28 38 20 5 16 32.7 0 215 -21 .. .. .. 27 16 27 .. .. .. 26 40 3 -3.13 - 28 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 27 51 50 .... Uncertainty in time = +/- 3 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: HIP 91578 * constellation : Telescopium * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 40 29.0699 DE: -45 44 52.319 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 40 29.0698 DE: -45 44 52.320 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (98) Ianthe asteroid class: approx. diameter [km]: 109 approx. diameter ["]: 0.076 distance from Earth [AU]: 1.96860 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#103 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): 0.029", 0.016", 82.349° remarks: * orbital elements for (98)Ianthe : Mean anomaly = 109.0849888667 deg Arg. of pericenter = 158.3700497236 deg Long. of node = 353.8940029082 deg Inclination = 15.5761148872 deg Eccentricity = 0.1874968272 Semimajor axis = 2.6869460414 AU Perihelion dist = 2.1831521838 AU Mag: H = 8.94, G = 0.15 Epoch of elements : MJD 60133.22326389 TDT (2023 Jul 08.2233) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1032023Apr24,8.46,2023,7,8,5.360792,0.112466,0.777361,-7.187193,1.039606,0.000560,0.002173,0.000001,0.000000 -85.7631,-45.7264,100.85,22.50,False HIP 91578,18.67474163,-45.7478663,0.00,9.43,0.00,0.0,4,,18.70400521,-45.7264448,3.92,0.00,0,0,0 98,Ianthe,13.32,108.8,1.9686,0,0,-3.065,4.65,,5.2,0 0,109.0350,2023,7,8,158.3700,353.8940,15.5761,0.18750,2.68695,2.18315,8.95,5.0,0.15 1.230,0.0287,0.0163,82,0.0176,Known errors,-1.00,-1,-1,-1 20230708__91578,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 03:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org