IOTA/IOTA-ES occultation update for (19) Fortuna / UCAC4 357-074766 event on 2023 Jun 15, 05:02 UT Visible from South America Summary ------- On 2023 Jun 15 UT, the 201.1 km diameter asteroid (19) Fortuna will occult a 11.9 mag star in the constellation Libra for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.53 mag to 11.44 mag (the magnitude of the asteroid) for at most 18.870 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 Jun 15, 04:52 - 2023 Jun 15, 05:12 * geocentric midpoint of event [JD]: 2460110.71031633 * magnitude of target star: 11.94 * magnitude drop [mag]: 0.53 * estimated maximum duration [s]: 18.870 * Moon: 9 % sunlit, 169° distance * Sun: 157° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 205 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 101°) * approx speed of asteroid's shadow [km/s]: 10.6588 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 357-074766 by 19 Fortuna on 2023 Jun 15 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 176 0 0 21 53 32 5 12 39.4 1 111 22 22 53 1 20 54 17 22 54 25 20 52 53 .... 177 0 0 21 32 29 5 12 39.2 2 111 21 22 32 2 20 33 9 22 33 26 20 31 46 -0.06 178 0 0 21 11 12 5 12 38.8 3 111 20 22 10 49 20 11 48 22 12 13 20 10 24 -0.11 179 0 0 20 49 41 5 12 38.3 4 112 19 21 49 21 19 50 13 21 50 46 19 48 49 -0.14 -180 0 0 20 27 56 5 12 37.5 5 112 18 21 27 41 19 28 25 21 29 5 19 27 1 -0.15 -179 0 0 20 5 59 5 12 36.6 6 112 17 21 5 47 19 6 24 21 7 12 19 5 0 -0.16 -178 0 0 19 43 49 5 12 35.5 7 113 16 20 43 41 18 44 11 20 45 6 18 42 47 -0.17 -177 0 0 19 21 28 5 12 34.2 8 113 15 20 21 22 18 21 46 20 22 47 18 20 22 -0.17 -176 0 0 18 58 54 5 12 32.7 9 113 14 19 58 52 17 59 10 20 0 17 17 57 46 -0.18 -175 0 0 18 36 10 5 12 31.0 10 114 13 19 36 11 17 36 23 19 37 36 17 34 58 -0.18 -174 0 0 18 13 15 5 12 29.1 11 114 12 19 13 19 17 13 25 19 14 44 17 12 1 -0.18 -173 0 0 17 50 10 5 12 27.0 12 114 11 18 50 16 16 50 17 18 51 41 16 48 53 -0.18 -172 0 0 17 26 55 5 12 24.7 13 115 10 18 27 4 16 27 0 18 28 29 16 25 36 -0.18 -171 0 0 17 3 32 5 12 22.2 14 115 9 18 3 43 16 3 34 18 5 8 16 2 10 -0.19 -170 0 0 16 39 59 5 12 19.6 15 115 8 17 40 12 15 40 0 17 41 38 15 38 35 -0.19 -169 0 0 16 16 19 5 12 16.7 16 116 7 17 16 34 15 16 18 17 17 59 15 14 53 -0.19 -168 0 0 15 52 31 5 12 13.7 17 116 6 16 52 48 14 52 28 16 54 13 14 51 3 -0.19 -167 0 0 15 28 36 5 12 10.4 18 116 5 16 28 54 14 28 31 16 30 20 14 27 7 -0.19 -166 0 0 15 4 35 5 12 7.0 19 116 4 16 4 54 14 4 29 16 6 20 14 3 4 -0.19 -165 0 0 14 40 27 5 12 3.4 20 117 3 15 40 48 13 40 20 15 42 13 13 38 56 -0.19 -164 0 0 14 16 15 5 11 59.6 21 117 2 15 16 36 13 16 7 15 18 2 13 14 42 -0.19 -163 0 0 13 51 57 5 11 55.6 22 117 1 14 52 19 12 51 48 14 53 45 12 50 24 -0.19 -162 0 0 13 27 35 5 11 51.4 23 117 0 14 27 58 12 27 26 14 29 24 12 26 1 -0.19 -161 0 0 13 3 10 5 11 47.0 24 118 -1 14 3 33 12 3 0 14 4 59 12 1 36 -0.19 -160 0 0 12 38 41 5 11 42.4 25 118 -2 13 39 5 11 38 32 13 40 30 11 37 7 -0.19 -159 0 0 12 14 10 5 11 37.7 26 118 -3 13 14 34 11 14 1 13 15 59 11 12 36 -0.19 -158 0 0 11 49 37 5 11 32.7 27 118 -4 12 50 0 10 49 28 12 51 26 10 48 3 -0.19 -157 0 0 11 25 3 5 11 27.6 28 119 -5 12 25 26 10 24 54 12 26 51 10 23 29 -0.19 -156 0 0 11 0 28 5 11 22.3 29 119 -6 12 0 50 10 0 19 12 2 15 9 58 55 -0.19 -155 0 0 10 35 52 5 11 16.8 30 119 -7 11 36 14 9 35 45 11 37 39 9 34 20 -0.19 -154 0 0 10 11 17 5 11 11.1 31 119 -8 11 11 37 9 11 10 11 13 3 9 9 46 -0.19 -153 0 0 9 46 43 5 11 5.3 32 120 -9 10 47 2 8 46 37 10 48 27 8 45 13 -0.19 -152 0 0 9 22 10 5 10 59.3 33 120 -10 10 22 28 8 22 6 10 23 53 8 20 41 -0.19 -151 0 0 8 57 39 5 10 53.1 34 120 -11 9 57 56 7 57 37 9 59 21 7 56 12 -0.19 -150 0 0 8 33 11 5 10 46.8 35 120 -12 9 33 26 7 33 10 9 34 51 7 31 46 -0.19 -149 0 0 8 8 46 5 10 40.3 36 121 -14 9 8 59 7 8 47 9 10 24 7 7 23 -0.19 -148 0 0 7 44 25 5 10 33.6 37 121 -15 8 44 36 6 44 28 8 46 1 6 43 3 -0.19 -147 0 0 7 20 8 5 10 26.8 38 121 -16 8 20 16 6 20 13 8 21 42 6 18 49 -0.19 -146 0 0 6 55 56 5 10 19.8 40 121 -17 7 56 2 5 56 3 7 57 27 5 54 39 -0.19 -145 0 0 6 31 49 5 10 12.7 41 122 -18 7 31 52 5 31 59 7 33 17 5 30 34 -0.19 -144 0 0 6 7 48 5 10 5.4 42 122 -19 7 7 49 5 8 0 7 9 14 5 6 36 -0.19 -143 0 0 5 43 53 5 9 58.0 43 122 -20 6 43 51 4 44 9 6 45 16 4 42 44 -0.19 -142 0 0 5 20 6 5 9 50.5 44 122 -21 6 20 1 4 20 24 6 21 26 4 19 0 -0.19 -141 0 0 4 56 25 5 9 42.8 45 123 -22 5 56 18 3 56 47 5 57 42 3 55 23 -0.19 -140 0 0 4 32 53 5 9 34.9 46 123 -23 5 32 42 3 33 18 5 34 7 3 31 54 -0.19 -139 0 0 4 9 29 5 9 27.0 47 123 -24 5 9 15 3 9 57 5 10 39 3 8 33 -0.19 -138 0 0 3 46 14 5 9 18.9 48 124 -25 4 45 56 2 46 45 4 47 21 2 45 22 -0.19 -137 0 0 3 23 9 5 9 10.7 49 124 -26 4 22 47 2 23 43 4 24 12 2 22 20 -0.19 -136 0 0 3 0 13 5 9 2.3 50 124 -27 3 59 48 2 0 51 4 1 12 1 59 28 -0.19 -135 0 0 2 37 28 5 8 53.9 51 125 -28 3 36 59 1 38 10 3 38 23 1 36 46 -0.19 -134 0 0 2 14 53 5 8 45.3 52 125 -29 3 14 20 1 15 39 3 15 44 1 14 15 -0.19 -133 0 0 1 52 30 5 8 36.7 53 125 -30 2 51 53 0 53 19 2 53 17 0 51 56 -0.19 -132 0 0 1 30 18 5 8 27.9 54 126 -31 2 29 37 0 31 12 2 31 1 0 29 48 -0.19 -131 0 0 1 8 18 5 8 19.0 55 126 -32 2 7 33 0 9 16 2 8 57 0 7 53 -0.19 -130 0 0 0 46 31 5 8 10.0 56 126 -33 1 45 41 - 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1 59 49 4 53 3.4 0 251 -23 .. .. .. - 2 58 31 .. .. .. - 2 59 54 -0.08 Uncertainty in time = +/- 1 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 357-074766 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 54 13.0151 DE: -18 46 45.204 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 54 13.0150 DE: -18 46 45.204 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (19) Fortuna asteroid class: ShapeModel approx. diameter [km]: 201 approx. diameter ["]: 0.157 distance from Earth [AU]: 1.77040 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#151 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): 0.009", 0.002", 101.162° remarks: * orbital elements for (19)Fortuna : Mean anomaly = 226.6814630331 deg Arg. of pericenter = 182.5649594906 deg Long. of node = 211.0358600429 deg Inclination = 1.5735009677 deg Eccentricity = 0.1572794121 Semimajor axis = 2.4425242387 AU Perihelion dist = 2.0583654624 AU Mag: H = 7.41, G = 0.10 Epoch of elements : MJD 60110.21020833 TDT (2023 Jun 15.2102) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1512023Apr24,18.87,2023,6,15,5.047592,0.040638,0.179467,-5.869595,1.319662,0.002099,-0.000577,0.000001,0.000000 -100.0469,-18.8492,104.39,23.30,False UCAC4 357-074766,15.90361530,-18.7792235,0.00,11.94,0.00,0.0,0,,15.92633815,-18.8492097,0.53,0.00,0,0,0 19,Fortuna,11.44,201.1,1.7704,0,0,-2.053,6.55,,11.6,0 0,226.6272,2023,6,15,182.5650,211.0359,1.5735,0.15728,2.44252,2.05837,7.43,5.0,0.15 1.012,0.0087,0.0018,101,0.0018,Known errors,-1.00,-1,-1,-1 20230615_074766,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org