IOTA/IOTA-ES occultation update for (98) Ianthe / TYC 7913-00924-1 event on 2023 Jul 26, 01:29 UT Visible from Africa, South America Summary ------- On 2023 Jul 26 UT, the 108.8 km diameter asteroid (98) Ianthe will occult a 11.8 mag star in the constellation Corona Australis for observers along a path across Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.93 mag to 13.56 mag (the magnitude of the asteroid) for at most 9.900 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 26, 01:21 - 2023 Jul 26, 01:37 * geocentric midpoint of event [JD]: 2460151.56211870 * magnitude of target star: 11.83 * magnitude drop [mag]: 1.93 * estimated maximum duration [s]: 9.900 * Moon: 51 % sunlit, 63° distance * Sun: 145° distance * rough path description: Africa, South America The occultation path -------------------- * approximate projected width [km]: 137 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.016) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.016", 86°) * approx speed of asteroid's shadow [km/s]: 10.9884 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7913-00924-1 by 98 Ianthe on 2023 Jul 26 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 - 83 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 40 57 35 .. .. .. 40 1 41 .... - 82 0 0 40 44 39 1 37 5.7 1 159 -8 .. .. .. 39 3 25 .. .. .. 38 9 44 .... - 81 0 0 38 48 44 1 37 4.9 3 160 -10 40 31 54 37 11 44 41 32 21 36 20 8 -0.41 - 80 0 0 36 55 43 1 37 3.3 5 160 -12 38 34 15 35 22 36 39 31 44 34 32 54 -0.59 - 79 0 0 35 5 36 1 37 0.8 7 161 -14 36 39 56 33 36 2 37 34 45 32 48 6 -0.66 - 78 0 0 33 18 20 1 36 57.5 9 162 -15 34 48 52 31 52 3 35 41 17 31 5 45 -0.69 - 77 0 0 31 33 53 1 36 53.4 11 162 -17 33 0 58 30 10 38 33 51 12 29 25 51 -0.72 - 76 0 0 29 52 14 1 36 48.7 12 163 -19 31 16 8 28 31 47 32 4 24 27 48 25 -0.73 - 75 0 0 28 13 20 1 36 43.2 14 163 -20 29 34 19 26 55 27 30 20 47 26 13 25 -0.74 - 74 0 0 26 37 8 1 36 37.2 16 164 -22 27 55 25 25 21 40 28 40 15 24 40 51 -0.75 - 73 0 0 25 3 35 1 36 30.6 18 164 -24 26 19 23 23 50 21 27 2 43 23 10 41 -0.76 - 72 0 0 23 32 39 1 36 23.5 20 165 -25 24 46 9 22 21 30 25 28 5 21 42 54 -0.76 - 71 0 0 22 4 16 1 36 15.9 21 165 -27 23 15 38 20 55 4 23 56 17 20 17 28 -0.77 - 70 0 0 20 38 23 1 36 7.9 23 166 -29 21 47 46 19 31 0 22 27 14 18 54 21 -0.77 - 69 0 0 19 14 58 1 35 59.4 24 167 -30 20 22 29 18 9 16 21 0 51 17 33 31 -0.77 - 68 0 0 17 53 56 1 35 50.7 26 167 -32 18 59 44 16 49 50 19 37 4 16 14 55 -0.78 - 67 0 0 16 35 15 1 35 41.6 27 168 -33 17 39 25 15 32 39 18 15 47 14 58 31 -0.78 - 66 0 0 15 18 51 1 35 32.2 29 168 -35 16 21 30 14 17 40 16 56 59 13 44 17 -0.78 - 65 0 0 14 4 42 1 35 22.5 30 169 -36 15 5 55 13 4 51 15 40 34 12 32 10 -0.78 - 64 0 0 12 52 44 1 35 12.6 31 170 -38 13 52 37 11 54 8 14 26 28 11 22 7 -0.78 - 63 0 0 11 42 55 1 35 2.5 33 170 -39 12 41 32 10 45 30 13 14 39 10 14 7 -0.78 - 62 0 0 10 35 11 1 34 52.2 34 171 -41 11 32 37 9 38 54 12 5 2 9 8 5 -0.78 - 61 0 0 9 29 30 1 34 41.8 35 172 -42 10 25 48 8 34 16 10 57 34 8 4 1 -0.78 - 60 0 0 8 25 48 1 34 31.2 36 172 -43 9 21 2 7 31 34 9 52 11 7 1 51 -0.78 - 59 0 0 7 24 3 1 34 20.4 38 173 -45 8 18 17 6 30 46 8 48 51 6 1 33 -0.78 - 58 0 0 6 24 12 1 34 9.6 39 174 -46 7 17 29 5 31 49 7 47 30 5 3 5 -0.78 - 57 0 0 5 26 12 1 33 58.7 40 175 -47 6 18 35 4 34 41 6 48 5 4 6 25 -0.78 - 56 0 0 4 30 2 1 33 47.7 41 175 -49 5 21 34 3 39 19 5 50 33 3 11 29 -0.78 - 55 0 0 3 35 38 1 33 36.7 42 176 -50 4 26 21 2 45 41 4 54 52 2 18 16 -0.78 - 54 0 0 2 42 57 1 33 25.6 43 177 -51 3 32 54 1 53 45 4 0 59 1 26 43 -0.78 - 53 0 0 1 51 58 1 33 14.5 43 178 -53 2 41 12 1 3 28 3 8 51 0 36 49 -0.78 - 52 0 0 1 2 39 1 33 3.4 44 179 -54 1 51 10 0 14 48 2 18 26 - 0 11 29 -0.78 - 51 0 0 0 14 56 1 32 52.2 45 180 -55 1 2 48 - 0 32 17 1 29 41 - 0 58 14 -0.78 - 50 0 0 - 0 31 12 1 32 41.1 46 181 -56 0 16 2 - 1 17 48 0 42 33 - 1 43 26 -0.78 - 49 0 0 - 1 15 47 1 32 29.9 47 182 -57 - 0 29 9 - 2 1 48 - 0 2 58 - 2 27 7 -0.78 - 48 0 0 - 1 58 51 1 32 18.8 47 183 -59 - 1 12 47 - 2 44 20 - 0 46 56 - 3 9 21 -0.78 - 47 0 0 - 2 40 26 1 32 7.7 48 184 -60 - 1 54 55 - 3 25 24 - 1 29 23 - 3 50 8 -0.78 - 46 0 0 - 3 20 35 1 31 56.6 48 185 -61 - 2 35 35 - 4 5 2 - 2 10 20 - 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Uncertainty in time = +/- 4 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: TYC 7913-00924-1 * constellation : Corona Australis * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 21 24.0548 DE: -44 38 09.061 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 21 24.0547 DE: -44 38 09.061 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (98) Ianthe asteroid class: approx. diameter [km]: 109 approx. diameter ["]: 0.073 distance from Earth [AU]: 2.06500 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): 0.027", 0.016", 86.309° remarks: * orbital elements for (98)Ianthe : Mean anomaly = 113.0832294959 deg Arg. of pericenter = 158.3646962762 deg Long. of node = 353.8937514032 deg Inclination = 15.5761363820 deg Eccentricity = 0.1875019866 Semimajor axis = 2.6868982554 AU Perihelion dist = 2.1830994947 AU Mag: H = 8.94, G = 0.15 Epoch of elements : MJD 60151.06201389 TDT (2023 Jul 26.0620) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1032023Apr24,9.90,2023,7,26,1.490849,0.304989,0.529036,-5.373639,3.096949,0.002618,0.001896,0.000001,0.000000 -50.0713,-44.6261,159.29,19.52,False TYC 7913-00924-1,18.35668190,-44.6358501,0.00,11.83,0.00,0.0,0,,18.38569828,-44.6261286,1.93,0.00,0,0,0 98,Ianthe,13.56,108.8,2.0650,0,0,-2.142,13.19,,5.2,0 0,112.8456,2023,7,25,158.3647,353.8938,15.5761,0.18750,2.68690,2.18310,8.93,5.0,0.15 1.278,0.0273,0.0160,86,0.0202,Known errors,-1.00,-1,-1,-1 20230726_0924-1,60092.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org