IOTA/IOTA-ES occultation update for (643) Scheherezade / UCAC4 368-122242 event on 2022 Jun 26, 02:12 UT Visible from Africa, South America Summary ------- On 2022 Jun 26 UT, the 66.9 km diameter asteroid (643) Scheherezade will occult a 12.0 mag star in the constellation Sagittarius 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 2.84 mag to 14.80 mag (the magnitude of the asteroid) for at most 4.580 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: 2022 Jun 26, 02:05 - 2022 Jun 26, 02:20 * geocentric midpoint of event [JD]: 2459756.59236016 * magnitude of target star: 12.04 * magnitude drop [mag]: 2.84 * estimated maximum duration [s]: 4.580 * Moon: 8 % sunlit, 149° distance * Sun: 173° distance * rough path description: Africa, South America The occultation path -------------------- * approximate projected width [km]: 67 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.007", 107°) * approx speed of asteroid's shadow [km/s]: 14.6093 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 368-122242 by 643 Scheherezade on 2022 Jun 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 -123 0 0 10 36 2 2 20 16.4 0 107 3 10 54 59 10 17 5 11 2 39 10 9 24 .... -122 0 0 10 18 3 2 20 16.3 1 107 2 10 37 1 9 59 5 10 44 42 9 51 24 0.09 -121 0 0 9 59 50 2 20 16.1 2 107 1 10 18 49 9 40 51 10 26 31 9 33 9 0.05 -120 0 0 9 41 24 2 20 15.7 3 107 0 10 0 24 9 22 23 10 8 6 9 14 42 0.04 -119 0 0 9 22 45 2 20 15.2 4 107 -1 9 41 46 9 3 43 9 49 28 8 56 1 0.03 -118 0 0 9 3 53 2 20 14.5 5 108 -2 9 22 55 8 44 50 9 30 38 8 37 8 0.03 -117 0 0 8 44 49 2 20 13.7 6 108 -3 9 3 52 8 25 45 9 11 35 8 18 2 0.03 -116 0 0 8 25 33 2 20 12.7 7 108 -4 8 44 37 8 6 28 8 52 21 7 58 44 0.02 -115 0 0 8 6 5 2 20 11.7 8 108 -5 8 25 10 7 46 59 8 32 54 7 39 15 0.02 -114 0 0 7 46 26 2 20 10.4 9 108 -6 8 5 33 7 27 20 8 13 17 7 19 35 0.02 -113 0 0 7 26 37 2 20 9.1 11 108 -7 7 45 44 7 7 29 7 53 29 6 59 44 0.02 -112 0 0 7 6 37 2 20 7.5 12 108 -8 7 25 45 6 47 28 7 33 30 6 39 43 0.02 -111 0 0 6 46 27 2 20 5.9 13 109 -9 7 5 36 6 27 17 7 13 21 6 19 32 0.02 -110 0 0 6 26 7 2 20 4.1 14 109 -10 6 45 17 6 6 57 6 53 3 5 59 11 0.02 -109 0 0 6 5 39 2 20 2.1 15 109 -11 6 24 50 5 46 28 6 32 36 5 38 42 0.02 -108 0 0 5 45 2 2 20 0.0 16 109 -13 6 4 13 5 25 50 6 12 0 5 18 4 0.02 -107 0 0 5 24 16 2 19 57.8 17 109 -14 5 43 29 5 5 4 5 51 15 4 57 17 0.01 -106 0 0 5 3 23 2 19 55.4 18 109 -15 5 22 36 4 44 10 5 30 23 4 36 23 0.01 -105 0 0 4 42 23 2 19 52.9 19 109 -16 5 1 37 4 23 9 5 9 24 4 15 22 0.01 -104 0 0 4 21 15 2 19 50.3 20 109 -17 4 40 30 4 2 1 4 48 17 3 54 14 0.01 -103 0 0 4 0 2 2 19 47.5 21 109 -18 4 19 17 3 40 47 4 27 4 3 32 59 0.01 -102 0 0 3 38 42 2 19 44.6 22 109 -19 3 57 57 3 19 26 4 5 45 3 11 39 0.01 -101 0 0 3 17 17 2 19 41.5 23 109 -20 3 36 33 2 58 1 3 44 21 2 50 13 0.01 -100 0 0 2 55 47 2 19 38.3 24 109 -21 3 15 3 2 36 30 3 22 51 2 28 42 0.01 - 99 0 0 2 34 12 2 19 35.0 25 109 -22 2 53 29 2 14 55 3 1 17 2 7 6 0.01 - 98 0 0 2 12 33 2 19 31.5 26 110 -23 2 31 50 1 53 16 2 39 39 1 45 27 0.01 - 97 0 0 1 50 51 2 19 28.0 27 110 -24 2 10 8 1 31 33 2 17 57 1 23 44 0.01 - 96 0 0 1 29 5 2 19 24.2 28 110 -25 1 48 23 1 9 47 1 56 12 1 1 58 0.01 - 95 0 0 1 7 17 2 19 20.4 29 110 -26 1 26 35 0 47 59 1 34 24 0 40 10 0.01 - 94 0 0 0 45 27 2 19 16.4 30 110 -27 1 4 45 0 26 9 1 12 34 0 18 20 0.01 - 93 0 0 0 23 35 2 19 12.3 31 110 -28 0 42 53 0 4 17 0 50 42 - 0 3 33 0.01 - 92 0 0 0 1 42 2 19 8.1 32 110 -29 0 21 0 - 0 17 37 0 28 49 - 0 25 26 0.01 - 91 0 0 - 0 20 12 2 19 3.7 34 110 -30 - 0 0 54 - 0 39 30 0 6 56 - 0 47 20 0.01 - 90 0 0 - 0 42 6 2 18 59.3 35 110 -31 - 0 22 47 - 1 1 24 - 0 14 58 - 1 9 14 0.01 - 89 0 0 - 1 4 0 2 18 54.7 36 110 -32 - 0 44 41 - 1 23 18 - 0 36 52 - 1 31 7 0.01 - 88 0 0 - 1 25 52 2 18 50.0 37 110 -33 - 1 6 34 - 1 45 11 - 0 58 45 - 1 53 0 0.01 - 87 0 0 - 1 47 44 2 18 45.2 38 109 -34 - 1 28 26 - 2 7 2 - 1 20 37 - 2 14 51 0.01 - 86 0 0 - 2 9 34 2 18 40.3 39 109 -35 - 1 50 16 - 2 28 52 - 1 42 27 - 2 36 41 0.01 - 85 0 0 - 2 31 22 2 18 35.2 40 109 -36 - 2 12 4 - 2 50 40 - 2 4 15 - 2 58 29 0.01 - 84 0 0 - 2 53 7 2 18 30.1 41 109 -37 - 2 33 49 - 3 12 25 - 2 26 1 - 3 20 13 0.01 - 83 0 0 - 3 14 49 2 18 24.8 42 109 -38 - 2 55 32 - 3 34 6 - 2 47 43 - 3 41 55 0.01 - 82 0 0 - 3 36 27 2 18 19.5 43 109 -40 - 3 17 11 - 3 55 44 - 3 9 22 - 4 3 33 0.01 - 81 0 0 - 3 58 2 2 18 14.1 44 109 -41 - 3 38 45 - 4 17 18 - 3 30 57 - 4 25 7 0.01 - 80 0 0 - 4 19 32 2 18 8.5 45 109 -42 - 4 0 16 - 4 38 48 - 3 52 27 - 4 46 36 0.01 - 79 0 0 - 4 40 57 2 18 2.9 46 109 -43 - 4 21 41 - 5 0 12 - 4 13 53 - 5 8 0 0.01 - 78 0 0 - 5 2 16 2 17 57.2 47 109 -44 - 4 43 1 - 5 21 31 - 4 35 13 - 5 29 19 0.01 - 77 0 0 - 5 23 30 2 17 51.3 48 109 -45 - 5 4 15 - 5 42 44 - 4 56 28 - 5 50 32 0.01 - 76 0 0 - 5 44 37 2 17 45.4 49 109 -46 - 5 25 23 - 6 3 51 - 5 17 36 - 6 11 39 0.01 - 75 0 0 - 6 5 38 2 17 39.5 50 108 -47 - 5 46 25 - 6 24 51 - 5 38 38 - 6 32 39 0.01 - 74 0 0 - 6 26 32 2 17 33.4 51 108 -48 - 6 7 19 - 6 45 44 - 5 59 32 - 6 53 31 0.01 - 73 0 0 - 6 47 18 2 17 27.2 52 108 -49 - 6 28 6 - 7 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43 58 -17 59 35 -18 51 27 0.02 38 0 0 -18 14 33 2 6 17.6 23 259 -26 -17 56 5 -18 33 2 -17 48 36 -18 40 31 0.02 39 0 0 -18 3 17 2 6 14.8 22 259 -25 -17 44 47 -18 21 46 -17 37 18 -18 29 16 0.02 40 0 0 -17 51 41 2 6 12.1 21 259 -24 -17 33 11 -18 10 12 -17 25 41 -18 17 42 0.02 41 0 0 -17 39 47 2 6 9.6 20 258 -23 -17 21 16 -17 58 19 -17 13 45 -18 5 49 0.02 42 0 0 -17 27 34 2 6 7.1 19 258 -22 -17 9 2 -17 46 7 -17 1 31 -17 53 38 0.02 43 0 0 -17 15 3 2 6 4.8 18 258 -21 -16 56 29 -17 33 37 -16 48 58 -17 41 9 0.02 44 0 0 -17 2 13 2 6 2.6 17 258 -20 -16 43 38 -17 20 49 -16 36 6 -17 28 20 0.02 45 0 0 -16 49 5 2 6 0.5 16 257 -19 -16 30 28 -17 7 42 -16 22 56 -17 15 14 0.02 46 0 0 -16 35 39 2 5 58.5 15 257 -18 -16 17 1 -16 54 16 -16 9 28 -17 1 49 0.02 47 0 0 -16 21 54 2 5 56.6 14 257 -17 -16 3 15 -16 40 33 -15 55 42 -16 48 6 0.02 48 0 0 -16 7 51 2 5 54.8 13 256 -16 -15 49 11 -16 26 32 -15 41 37 -16 34 6 0.02 49 0 0 -15 53 31 2 5 53.2 12 256 -15 -15 34 49 -16 12 13 -15 27 15 -16 19 47 0.02 50 0 0 -15 38 53 2 5 51.7 11 256 -14 -15 20 10 -15 57 36 -15 12 35 -16 5 10 0.02 51 0 0 -15 23 57 2 5 50.3 10 256 -13 -15 5 13 -15 42 41 -14 57 37 -15 50 17 0.02 52 0 0 -15 8 44 2 5 49.0 9 255 -12 -14 49 58 -15 27 29 -14 42 22 -15 35 5 0.02 53 0 0 -14 53 13 2 5 47.9 8 255 -11 -14 34 26 -15 12 0 -14 26 50 -15 19 37 0.02 54 0 0 -14 37 26 2 5 46.9 7 255 -10 -14 18 38 -14 56 14 -14 11 1 -15 3 51 0.02 55 0 0 -14 21 21 2 5 46.0 6 255 -9 -14 2 32 -14 40 11 -13 54 55 -14 47 48 0.03 56 0 0 -14 5 0 2 5 45.2 5 254 -8 -13 46 10 -14 23 51 -13 38 32 -14 31 29 0.03 57 0 0 -13 48 23 2 5 44.6 4 254 -7 -13 29 31 -14 7 15 -13 21 52 -14 14 53 0.03 58 0 0 -13 31 29 2 5 44.1 3 254 -6 -13 12 36 -13 50 22 -13 4 57 -13 58 1 0.04 59 0 0 -13 14 19 2 5 43.8 2 254 -5 -12 55 24 -13 33 14 -12 47 45 -13 40 53 0.06 60 0 0 -12 56 53 2 5 43.6 1 253 -4 -12 37 57 -13 15 49 -12 30 17 -13 23 29 0.11 61 0 0 -12 39 12 2 5 43.5 0 253 -3 .. .. .. -12 58 9 .. .. .. -13 5 50 1.88 Uncertainty in time = +/- 2 secs Prediction of 2022 Jun 13.8 Data for the target star ------------------------ * name: UCAC4 368-122242 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 10 20.3314 DE: -16 25 35.071 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 10 20.3314 DE: -16 25 35.071 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (643) Scheherezade asteroid class: approx. diameter [km]: 67 approx. diameter ["]: 0.037 distance from Earth [AU]: 2.51360 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 date of fit: 2022 Jun 06 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): 0.016", 0.007", 106.875° remarks: * orbital elements for (643)Scheherezade : Mean anomaly = 148.8628941617 deg Arg. of pericenter = 229.3581751354 deg Long. of node = 252.1615867411 deg Inclination = 13.7723798282 deg Eccentricity = 0.0567384235 Semimajor axis = 3.3586320676 AU Perihelion dist = 3.1680685790 AU Mag: H = 9.82, G = 0.15 Epoch of elements : MJD 59756.09229167 TDT (2022 Jun 26.0923) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512022Jun06,4.58,2022,6,26,2.216644,-0.003737,-0.017510,-8.063557,1.724422,0.000166,-0.000693,0.000001,0.000000 -34.5296,-16.4218,147.46,23.36,False UCAC4 368-122242,18.17231429,-16.4264087,0.00,12.04,0.00,0.0,0,,18.19411663,-16.4218235,2.84,0.00,0,0,0 643,Scheherezade,14.80,66.9,2.5136,0,0,-1.960,6.03,,3.8 0,148.6880,2022,6,25,229.3582,252.1616,13.7724,0.05674,3.35863,3.16807,9.82,5.0,0.15 1.202,0.0160,0.0073,107,0.0074,Known errors,-1.00,-1,-1,-1 20220626_122242,59743.85 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 13, 20:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org