IOTA/IOTA-ES occultation update for (19) Fortuna / UCAC4-352-077369 event on 2023 May 29, 01:37 UT Visible from Africa, South America Summary ------- On 2023 May 29 UT, the 201.1 km diameter asteroid (19) Fortuna will occult a 12.4 mag star in the constellation Scorpius 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 0.27 mag to 11.00 mag (the magnitude of the asteroid) for at most 15.850 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 May 29, 01:28 - 2023 May 29, 01:45 * geocentric midpoint of event [JD]: 2460093.56750130 * magnitude of target star: 12.36 * magnitude drop [mag]: 0.27 * estimated maximum duration [s]: 15.850 * Moon: 63 % sunlit, 72° distance * Sun: 177° distance * rough path description: Africa, South America Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 202 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 100°) * approx speed of asteroid's shadow [km/s]: 12.6855 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-352-077369 by 19 Fortuna on 2023 May 29 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 -117 0 0 6 48 2 1 45 33.1 0 110 2 7 46 10 5 49 50 7 47 30 5 48 29 .... -116 0 0 6 26 13 1 45 33.0 1 110 1 7 24 24 5 27 56 7 25 45 5 26 35 0.13 -115 0 0 6 4 9 1 45 32.6 2 110 0 7 2 25 5 5 48 7 3 45 5 4 27 0.11 -114 0 0 5 41 51 1 45 32.2 4 110 -1 6 40 11 4 43 26 6 41 32 4 42 5 0.10 -113 0 0 5 19 20 1 45 31.5 5 110 -2 6 17 44 4 20 51 6 19 5 4 19 30 0.09 -112 0 0 4 56 36 1 45 30.7 6 110 -3 5 55 4 3 58 4 5 56 25 3 56 42 0.09 -111 0 0 4 33 40 1 45 29.7 7 110 -4 5 32 11 3 35 4 5 33 32 3 33 42 0.08 -110 0 0 4 10 32 1 45 28.5 8 111 -5 5 9 7 3 11 52 5 10 28 3 10 30 0.08 -109 0 0 3 47 12 1 45 27.1 9 111 -6 4 45 51 2 48 29 4 47 12 2 47 7 0.08 -108 0 0 3 23 42 1 45 25.6 10 111 -7 4 22 24 2 24 55 4 23 45 2 23 34 0.08 -107 0 0 3 0 1 1 45 23.9 11 111 -8 3 58 46 2 1 12 4 0 8 1 59 50 0.08 -106 0 0 2 36 11 1 45 22.0 12 111 -9 3 34 59 1 37 18 3 36 21 1 35 57 0.08 -105 0 0 2 12 12 1 45 20.0 13 111 -10 3 11 2 1 13 16 3 12 24 1 11 54 0.08 -104 0 0 1 48 3 1 45 17.7 14 111 -11 2 46 57 0 49 5 2 48 19 0 47 43 0.08 -103 0 0 1 23 47 1 45 15.4 15 111 -12 2 22 43 0 24 46 2 24 5 0 23 24 0.08 -102 0 0 0 59 23 1 45 12.8 16 111 -14 1 58 22 0 0 20 1 59 44 - 0 1 2 0.08 -101 0 0 0 34 53 1 45 10.1 17 111 -15 1 33 54 - 0 24 13 1 35 15 - 0 25 35 0.08 -100 0 0 0 10 16 1 45 7.2 18 111 -16 1 9 19 - 0 48 52 1 10 40 - 0 50 14 0.08 - 99 0 0 - 0 14 27 1 45 4.1 20 111 -17 0 44 38 - 1 13 36 0 46 0 - 1 14 59 0.08 - 98 0 0 - 0 39 15 1 45 0.9 21 111 -18 0 19 51 - 1 38 26 0 21 13 - 1 39 48 0.08 - 97 0 0 - 1 4 8 1 44 57.5 22 111 -19 - 0 5 0 - 2 3 20 - 0 3 38 - 2 4 43 0.08 - 96 0 0 - 1 29 4 1 44 53.9 23 111 -20 - 0 29 55 - 2 28 18 - 0 28 33 - 2 29 41 0.08 - 95 0 0 - 1 54 4 1 44 50.2 24 111 -21 - 0 54 54 - 2 53 20 - 0 53 32 - 2 54 42 0.08 - 94 0 0 - 2 19 7 1 44 46.4 25 111 -22 - 1 19 56 - 3 18 24 - 1 18 34 - 3 19 46 0.08 - 93 0 0 - 2 44 12 1 44 42.3 26 111 -23 - 1 45 0 - 3 43 30 - 1 43 38 - 3 44 52 0.07 - 92 0 0 - 3 9 19 1 44 38.1 27 111 -24 - 2 10 6 - 4 8 37 - 2 8 44 - 4 9 59 0.07 - 91 0 0 - 3 34 27 1 44 33.8 28 110 -25 - 2 35 13 - 4 33 45 - 2 33 51 - 4 35 8 0.07 - 90 0 0 - 3 59 35 1 44 29.3 29 110 -26 - 3 0 21 - 4 58 54 - 2 58 59 - 5 0 16 0.07 - 89 0 0 - 4 24 43 1 44 24.7 30 110 -27 - 3 25 29 - 5 24 2 - 3 24 7 - 5 25 25 0.07 - 88 0 0 - 4 49 51 1 44 19.9 31 110 -28 - 3 50 37 - 5 49 10 - 3 49 14 - 5 50 32 0.07 - 87 0 0 - 5 14 57 1 44 15.0 32 110 -30 - 4 15 43 - 6 14 15 - 4 14 21 - 6 15 38 0.07 - 86 0 0 - 5 40 1 1 44 9.9 33 110 -31 - 4 40 47 - 6 39 19 - 4 39 25 - 6 40 42 0.07 - 85 0 0 - 6 5 3 1 44 4.7 34 110 -32 - 5 5 50 - 7 4 20 - 5 4 28 - 7 5 43 0.07 - 84 0 0 - 6 30 1 1 43 59.4 35 110 -33 - 5 30 49 - 7 29 18 - 5 29 27 - 7 30 41 0.08 - 83 0 0 - 6 54 56 1 43 54.0 37 109 -34 - 5 55 45 - 7 54 12 - 5 54 23 - 7 55 35 0.08 - 82 0 0 - 7 19 47 1 43 48.4 38 109 -35 - 6 20 37 - 8 19 2 - 6 19 15 - 8 20 24 0.08 - 81 0 0 - 7 44 33 1 43 42.7 39 109 -36 - 6 45 24 - 8 43 47 - 6 44 2 - 8 45 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1 28 52.7 4 251 -7 -16 31 40 -18 27 43 -16 30 20 -18 29 4 0.11 67 0 0 -17 9 0 1 28 52.1 3 250 -6 -16 10 56 -18 7 9 -16 9 35 -18 8 30 0.12 68 0 0 -16 48 4 1 28 51.6 2 250 -5 -15 49 55 -17 46 17 -15 48 34 -17 47 38 0.14 69 0 0 -16 26 50 1 28 51.3 1 250 -4 -15 28 36 -17 25 9 -15 27 15 -17 26 30 0.20 70 0 0 -16 5 20 1 28 51.2 0 250 -3 .. .. .. -17 3 43 .. .. .. -17 5 4 0.79 Uncertainty in time = +/- 1 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4-352-077369 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 10 14.6938 DE: -19 37 10.683 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 10 14.6938 DE: -19 37 10.683 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * 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 ["]: 0.160 distance from Earth [AU]: 1.73750 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", 99.953° remarks: * orbital elements for (19)Fortuna : Mean anomaly = 222.2592722263 deg Arg. of pericenter = 182.5616493457 deg Long. of node = 211.0354468036 deg Inclination = 1.5734854076 deg Eccentricity = 0.1572687107 Semimajor axis = 2.4425567497 AU Perihelion dist = 2.0584189990 AU Mag: H = 7.41, G = 0.10 Epoch of elements : MJD 60093.06743055 TDT (2023 May 29.0674) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1512023Apr24,15.85,2023,5,29,1.620031,-0.017592,-0.081930,-7.000572,1.502853,0.000280,-0.000191,0.000001,0.000000 -27.7265,-19.6817,155.04,21.56,False UCAC4-352-077369,16.17074828,-19.6196342,0.00,12.36,0.00,0.0,4,K,16.19367470,-19.6816827,0.27,0.00,0,0,0 19,Fortuna,11.00,201.1,1.7375,0,0,-2.508,7.61,,11.6,0 0,221.9837,2023,5,28,182.5616,211.0354,1.5735,0.15727,2.44256,2.05842,7.43,5.0,0.15 1.012,0.0090,0.0018,100,0.0018,Known errors,-1.00,-1,-1,-1 20230529_077369,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org