IOTA/IOTA-ES occultation update for (19) Fortuna / UCAC4-355-076186 event on 2023 Jun 10, 03:51 UT Visible from South America Summary ------- On 2023 Jun 10 UT, the 201.1 km diameter asteroid (19) Fortuna will occult a 12.5 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 0.33 mag to 11.32 mag (the magnitude of the asteroid) for at most 17.360 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 10, 03:41 - 2023 Jun 10, 04:00 * geocentric midpoint of event [JD]: 2460105.66055046 * magnitude of target star: 12.46 * magnitude drop [mag]: 0.33 * estimated maximum duration [s]: 17.360 * Moon: 57 % sunlit, 99° distance * Sun: 163° distance * rough path description: South America Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 201 * 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]: 11.5842 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-355-076186 by 19 Fortuna on 2023 Jun 10 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 -165 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 9 34 36 .. .. .. 9 33 15 .... -164 0 0 10 11 26 4 0 21.8 1 110 16 11 9 19 9 13 33 11 10 41 9 12 11 .... -163 0 0 9 50 13 4 0 21.6 2 110 15 10 48 10 8 52 15 10 49 31 8 50 53 0.08 -162 0 0 9 28 45 4 0 21.2 3 110 14 10 26 46 8 30 43 10 28 7 8 29 21 0.05 -161 0 0 9 7 3 4 0 20.6 4 110 13 10 5 8 8 8 57 10 6 29 8 7 35 0.04 -160 0 0 8 45 8 4 0 19.9 5 110 12 9 43 16 7 46 58 9 44 38 7 45 36 0.04 -159 0 0 8 22 59 4 0 18.9 6 110 11 9 21 12 7 24 46 9 22 33 7 23 24 0.03 -158 0 0 8 0 38 4 0 17.7 7 110 10 8 58 54 7 2 21 9 0 16 7 0 59 0.03 -157 0 0 7 38 5 4 0 16.4 8 111 9 8 36 25 6 39 45 8 37 47 6 38 23 0.03 -156 0 0 7 15 21 4 0 14.9 9 111 8 8 13 44 6 16 57 8 15 6 6 15 35 0.03 -155 0 0 6 52 26 4 0 13.2 10 111 7 7 50 52 5 53 59 7 52 14 5 52 37 0.02 -154 0 0 6 29 20 4 0 11.3 11 111 6 7 27 49 5 30 50 7 29 11 5 29 27 0.02 -153 0 0 6 6 3 4 0 9.2 12 111 5 7 4 35 5 7 31 7 5 58 5 6 8 0.02 -152 0 0 5 42 38 4 0 7.0 13 111 4 6 41 13 4 44 2 6 42 35 4 42 40 0.02 -151 0 0 5 19 3 4 0 4.5 14 111 3 6 17 41 4 20 25 6 19 3 4 19 3 0.02 -150 0 0 4 55 20 4 0 1.9 16 111 2 5 54 0 3 56 40 5 55 23 3 55 17 0.02 -149 0 0 4 31 29 3 59 59.1 17 111 1 5 30 11 3 32 46 5 31 34 3 31 24 0.02 -148 0 0 4 7 31 3 59 56.1 18 112 0 5 6 15 3 8 46 5 7 38 3 7 23 0.02 -147 0 0 3 43 26 3 59 52.9 19 112 -1 4 42 12 2 44 39 4 43 35 2 43 16 0.02 -146 0 0 3 19 14 3 59 49.5 20 112 -2 4 18 2 2 20 25 4 19 25 2 19 2 0.02 -145 0 0 2 54 57 3 59 46.0 21 112 -4 3 53 47 1 56 6 3 55 10 1 54 44 0.02 -144 0 0 2 30 35 3 59 42.2 22 112 -5 3 29 26 1 31 43 3 30 49 1 30 20 0.02 -143 0 0 2 6 8 3 59 38.4 23 112 -6 3 5 0 1 7 14 3 6 23 1 5 51 0.02 -142 0 0 1 41 37 3 59 34.3 24 112 -7 2 40 31 0 42 42 2 41 54 0 41 19 0.02 -141 0 0 1 17 3 3 59 30.0 25 112 -8 2 15 57 0 18 7 2 17 20 0 16 44 0.02 -140 0 0 0 52 25 3 59 25.6 26 112 -9 1 51 21 - 0 6 31 1 52 44 - 0 7 54 0.02 -139 0 0 0 27 46 3 59 21.0 27 112 -10 1 26 42 - 0 31 11 1 28 5 - 0 32 34 0.02 -138 0 0 0 3 5 3 59 16.3 28 112 -11 1 2 2 - 0 55 53 1 3 24 - 0 57 16 0.02 -137 0 0 - 0 21 38 3 59 11.4 29 112 -12 0 37 20 - 1 20 35 0 38 42 - 1 21 58 0.02 -136 0 0 - 0 46 20 3 59 6.3 30 112 -13 0 12 37 - 1 45 18 0 14 0 - 1 46 41 0.02 -135 0 0 - 1 11 3 3 59 1.1 31 112 -14 - 0 12 6 - 2 10 1 - 0 10 43 - 2 11 24 0.02 -134 0 0 - 1 35 45 3 58 55.7 33 112 -15 - 0 36 49 - 2 34 43 - 0 35 26 - 2 36 6 0.02 -133 0 0 - 2 0 27 3 58 50.1 34 112 -16 - 1 1 30 - 2 59 24 - 1 0 7 - 3 0 47 0.02 -132 0 0 - 2 25 6 3 58 44.4 35 112 -17 - 1 26 10 - 3 24 3 - 1 24 47 - 3 25 26 0.02 -131 0 0 - 2 49 43 3 58 38.6 36 112 -18 - 1 50 48 - 3 48 39 - 1 49 25 - 3 50 2 0.02 -130 0 0 - 3 14 17 3 58 32.6 37 112 -19 - 2 15 23 - 4 13 13 - 2 14 0 - 4 14 36 0.02 -129 0 0 - 3 38 48 3 58 26.4 38 111 -21 - 2 39 55 - 4 37 43 - 2 38 32 - 4 39 6 0.02 -128 0 0 - 4 3 15 3 58 20.2 39 111 -22 - 3 4 23 - 5 2 8 - 3 3 0 - 5 3 31 0.02 -127 0 0 - 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Uncertainty in time = +/- 1 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4-355-076186 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 58 34.7145 DE: -19 00 43.089 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 58 34.7145 DE: -19 00 43.089 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * 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 ["]: 0.158 distance from Earth [AU]: 1.75260 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", 100.842° remarks: * orbital elements for (19)Fortuna : Mean anomaly = 225.3788892181 deg Arg. of pericenter = 182.5639178783 deg Long. of node = 211.0357256595 deg Inclination = 1.5734961172 deg Eccentricity = 0.1572760768 Semimajor axis = 2.4425344586 AU Perihelion dist = 2.0583822216 AU Mag: H = 7.41, G = 0.10 Epoch of elements : MJD 60105.16048611 TDT (2023 Jun 10.1605) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1512023Apr24,17.36,2023,6,10,3.853211,-0.005915,-0.026474,-6.382398,1.420005,0.001553,-0.000451,0.000001,0.000000 -76.0625,-19.0799,122.05,22.99,False UCAC4-355-076186,15.97630959,-19.0119692,0.00,12.46,0.00,0.0,0,,15.99909926,-19.0798677,0.33,0.00,0,0,0 19,Fortuna,11.32,201.1,1.7526,0,0,-2.258,7.12,,11.6,0 0,225.3375,2023,6,10,182.5639,211.0357,1.5735,0.15728,2.44253,2.05838,7.43,5.0,0.15 1.012,0.0090,0.0018,101,0.0019,Known errors,-1.00,-1,-1,-1 20230610_076186,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org