IOTA/IOTA-ES occultation update for (423) Diotima / TYC 6198-01088-1 event on 2023 Aug 30, 10:58 UT Visible from Australia Summary ------- On 2023 Aug 30 UT, the 200.6 km diameter asteroid (423) Diotima will occult a 11.5 mag star in the constellation Scorpius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.81 mag to 13.03 mag (the magnitude of the asteroid) for at most 10.150 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 Aug 30, 10:52 - 2023 Aug 30, 11:03 * geocentric midpoint of event [JD]: 2460186.95720275 * magnitude of target star: 11.45 * magnitude drop [mag]: 1.81 * estimated maximum duration [s]: 10.150 * Moon: 99 % sunlit, 87° distance * Sun: 84° distance * rough path description: Australia Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 201 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.004, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.004", 0.000", 115°) * approx speed of asteroid's shadow [km/s]: 19.7652 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6198-01088-1 by 423 Diotima on 2023 Aug 30 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 16 0 0 .. .. .... .. .. .. .. .. .. 21 27 22 .. .. .. 21 26 42 .. .. .. .... 17 0 0 22 1 43 10 53 0.9 1 115 77 21 1 46 23 1 44 21 1 7 23 2 24 .... 18 0 0 21 35 51 10 53 1.0 2 115 77 20 35 46 22 36 0 20 35 6 22 36 41 0.03 19 0 0 21 9 33 10 53 1.3 3 115 78 20 9 20 22 9 52 20 8 40 22 10 32 -0.01 20 0 0 20 42 51 10 53 1.6 4 116 78 19 42 29 21 43 18 19 41 49 21 43 58 -0.03 21 0 0 20 15 44 10 53 2.0 5 116 78 19 15 14 21 16 19 19 14 34 21 16 59 -0.04 22 0 0 19 48 13 10 53 2.6 6 116 78 18 47 34 20 48 56 18 46 54 20 49 36 -0.04 23 0 0 19 20 17 10 53 3.2 7 117 78 18 19 31 20 21 9 18 18 51 20 21 49 -0.05 24 0 0 18 51 59 10 53 4.0 8 117 78 17 51 4 19 52 58 17 50 24 19 53 39 -0.05 25 0 0 18 23 17 10 53 4.9 9 117 78 17 22 15 19 24 24 17 21 34 19 25 5 -0.05 26 0 0 17 54 12 10 53 5.8 10 118 77 16 53 3 18 55 27 16 52 22 18 56 8 -0.06 27 0 0 17 24 46 10 53 7.0 11 118 77 16 23 29 18 26 8 16 22 48 18 26 49 -0.06 28 0 0 16 54 58 10 53 8.2 12 118 77 15 53 34 17 56 28 15 52 53 17 57 9 -0.06 29 0 0 16 24 49 10 53 9.5 13 119 76 15 23 18 17 26 26 15 22 37 17 27 7 -0.06 30 0 0 15 54 20 10 53 11.0 14 119 75 14 52 42 16 56 4 14 52 1 16 56 45 -0.06 31 0 0 15 23 31 10 53 12.6 15 119 75 14 21 46 16 25 21 14 21 5 16 26 2 -0.06 32 0 0 14 52 23 10 53 14.3 17 119 74 13 50 32 15 54 20 13 49 51 15 55 1 -0.06 33 0 0 14 20 57 10 53 16.2 18 120 73 13 18 59 15 22 59 13 18 18 15 23 41 -0.06 34 0 0 13 49 13 10 53 18.1 19 120 73 12 47 9 14 51 21 12 46 28 14 52 3 -0.07 35 0 0 13 17 12 10 53 20.2 20 120 72 12 15 3 14 19 26 12 14 22 14 20 7 -0.07 36 0 0 12 44 55 10 53 22.4 21 120 71 11 42 41 13 47 14 11 41 59 13 47 56 -0.07 37 0 0 12 12 22 10 53 24.7 22 121 70 11 10 4 13 14 47 11 9 22 13 15 28 -0.07 38 0 0 11 39 36 10 53 27.2 23 121 69 10 37 12 12 42 5 10 36 31 12 42 46 -0.07 39 0 0 11 6 35 10 53 29.8 24 121 68 10 4 7 12 9 9 10 3 26 12 9 50 -0.07 40 0 0 10 33 22 10 53 32.5 26 121 67 9 30 50 11 35 59 9 30 9 11 36 41 -0.07 41 0 0 9 59 57 10 53 35.3 27 122 66 8 57 22 11 2 38 8 56 40 11 3 20 -0.07 42 0 0 9 26 21 10 53 38.3 28 122 65 8 23 43 10 29 6 8 23 1 10 29 47 -0.07 43 0 0 8 52 36 10 53 41.4 29 122 64 7 49 54 9 55 23 7 49 13 9 56 5 -0.07 44 0 0 8 18 41 10 53 44.6 30 122 63 7 15 57 9 21 31 7 15 16 9 22 13 -0.07 45 0 0 7 44 39 10 53 47.9 31 122 62 6 41 53 8 47 31 6 41 11 8 48 13 -0.07 46 0 0 7 10 30 10 53 51.3 32 122 61 6 7 42 8 13 23 6 7 0 8 14 5 -0.07 47 0 0 6 36 15 10 53 54.9 34 123 60 5 33 25 7 39 10 5 32 44 7 39 51 -0.07 48 0 0 6 1 55 10 53 58.6 35 123 59 4 59 5 7 4 51 4 58 23 7 5 33 -0.07 49 0 0 5 27 31 10 54 2.3 36 123 58 4 24 40 6 30 28 4 23 59 6 31 10 -0.07 50 0 0 4 53 5 10 54 6.2 37 123 57 3 50 14 5 56 2 3 49 32 5 56 44 -0.07 51 0 0 4 18 37 10 54 10.3 38 123 56 3 15 46 5 21 34 3 15 5 5 22 15 -0.07 52 0 0 3 44 9 10 54 14.4 39 123 54 2 41 19 4 47 5 2 40 37 4 47 47 -0.07 53 0 0 3 9 41 10 54 18.6 41 124 53 2 6 52 4 12 36 2 6 10 4 13 18 -0.07 54 0 0 2 35 15 10 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-19 32 28 -17 37 48 -19 33 6 -17 37 10 -0.08 176 0 0 -18 16 22 11 3 34.1 14 250 -70 -19 13 47 -17 18 51 -19 14 26 -17 18 13 -0.07 177 0 0 -17 57 5 11 3 35.4 13 250 -71 -18 54 38 -16 59 26 -18 55 16 -16 58 48 -0.07 178 0 0 -17 37 19 11 3 36.7 12 250 -72 -18 35 1 -16 39 32 -18 35 39 -16 38 54 -0.07 179 0 0 -17 17 5 11 3 37.8 11 250 -73 -18 14 55 -16 19 11 -18 15 34 -16 18 32 -0.07 180 0 0 -16 56 24 11 3 38.9 10 249 -74 -17 54 22 -15 58 21 -17 55 0 -15 57 42 -0.07 -179 0 0 -16 35 14 11 3 39.8 9 249 -75 -17 33 20 -15 37 3 -17 33 59 -15 36 24 -0.07 -178 0 0 -16 13 37 11 3 40.7 8 249 -76 -17 11 52 -15 15 17 -17 12 30 -15 14 38 -0.07 -177 0 0 -15 51 32 11 3 41.4 7 248 -77 -16 49 55 -14 53 4 -16 50 34 -14 52 25 -0.07 -176 0 0 -15 29 1 11 3 42.1 6 248 -78 -16 27 32 -14 30 24 -16 28 11 -14 29 45 -0.06 -175 0 0 -15 6 2 11 3 42.6 5 248 -79 -16 4 42 -14 7 17 -16 5 21 -14 6 38 -0.06 -174 0 0 -14 42 37 11 3 43.0 4 248 -80 -15 41 25 -13 43 43 -15 42 4 -13 43 4 -0.05 -173 0 0 -14 18 45 11 3 43.4 3 247 -81 -15 17 42 -13 19 43 -15 18 21 -13 19 4 -0.04 -172 0 0 -13 54 27 11 3 43.6 2 247 -82 -14 53 32 -12 55 17 -14 54 11 -12 54 37 -0.02 -171 0 0 -13 29 44 11 3 43.7 1 247 -83 -14 28 57 -12 30 25 -14 29 36 -12 29 45 0.08 Uncertainty in time = +/- 0 secs Prediction of 2023 Aug 6.7 Data for the target star ------------------------ * name: TYC 6198-01088-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 51 43.2547 DE: -22 27 53.578 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 51 43.2546 DE: -22 27 53.577 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (423) Diotima asteroid class: approx. diameter [km]: 201 approx. diameter ["]: 0.096 distance from Earth [AU]: 2.89170 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#134 date of fit: 2023 Jul 30 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): 0.004", 0.000", 115.184° remarks: * orbital elements for (423)Diotima : Mean anomaly = 352.2636818091 deg Arg. of pericenter = 199.5777787997 deg Long. of node = 69.3502018905 deg Inclination = 11.2424479356 deg Eccentricity = 0.0345808733 Semimajor axis = 3.0681155687 AU Perihelion dist = 2.9620174529 AU Mag: H = 7.42, G = 0.15 Epoch of elements : MJD 60186.45715278 TDT (2023 Aug 30.4572) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1342023Jul30,10.15,2023,8,30,10.972866,0.028161,0.080655,10.535553,-3.668731,0.005478,-0.001193,0.000000,0.000000 95.3022,-22.5362,15.59,9.00,False TYC 6198-01088-1,15.86201523,-22.4648828,0.00,11.45,0.00,0.0,0,,15.88509816,-22.5361851,1.81,0.00,0,0,0 423,Diotima,13.03,200.600,2.8917,0,0,2.313,-11.16,,11.4,0 0,352.1798,2023,8,30,199.5778,69.3502,11.2424,0.03458,3.06812,2.96202,7.37,5.0,0.15 1.006,0.0043,0.0003,115,0.0043,Known errors,-1.00,0,-1,-1 20230830_1088-1,60162.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 06, 16:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org