IOTA/IOTA-ES occultation update for (654) Zelinda / UCAC4 559-045648 event on 2022 Oct 17, 13:54 UT Visible from W USA Summary ------- On 2022 Oct 17 UT, the 130.3 km diameter asteroid (654) Zelinda will occult a 11.8 mag star in the constellation Cancer for observers along a path across W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.23 mag to 12.56 mag (the magnitude of the asteroid) for at most 5.020 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: 2022 Oct 17, 13:49 - 2022 Oct 17, 13:58 * geocentric midpoint of event [JD]: 2459870.07910479 * magnitude of target star: 11.75 * magnitude drop [mag]: 1.23 * estimated maximum duration [s]: 5.020 * Moon: 52 % sunlit, 12° distance * Sun: 80° distance * rough path description: W USA Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 132 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.006, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.006", 0.002", 119°) * approx speed of asteroid's shadow [km/s]: 25.9747 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 559-045648 by 654 Zelinda on 2022 Oct 17 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 148 0 0 35 37 12 13 49 53.8 1 64 -64 34 57 17 36 17 12 34 55 45 36 18 44 .... 149 0 0 36 1 12 13 49 53.9 2 64 -63 35 21 26 36 41 3 35 19 54 36 42 35 -0.21 150 0 0 36 24 38 13 49 54.1 3 65 -63 35 45 0 37 4 20 35 43 29 37 5 52 -0.20 151 0 0 36 47 29 13 49 54.3 4 66 -63 36 8 1 37 27 3 36 6 30 37 28 34 -0.19 152 0 0 37 9 47 13 49 54.6 4 66 -62 36 30 27 37 49 12 36 28 57 37 50 43 -0.19 153 0 0 37 31 32 13 49 54.9 5 67 -62 36 52 20 38 10 48 36 50 50 38 12 18 -0.19 154 0 0 37 52 42 13 49 55.3 6 67 -61 37 13 40 38 31 50 37 12 10 38 33 20 -0.19 155 0 0 38 13 20 13 49 55.7 7 68 -61 37 34 25 38 52 19 37 32 56 38 53 49 -0.18 156 0 0 38 33 24 13 49 56.2 8 69 -60 37 54 38 39 12 15 37 53 9 39 13 45 -0.18 157 0 0 38 52 55 13 49 56.7 9 69 -60 38 14 17 39 31 38 38 12 49 39 33 7 -0.18 158 0 0 39 11 54 13 49 57.3 10 70 -59 38 33 24 39 50 29 38 31 56 39 51 58 -0.18 159 0 0 39 30 20 13 49 58.0 10 71 -59 38 51 58 40 8 47 38 50 30 40 10 15 -0.18 160 0 0 39 48 14 13 49 58.6 11 71 -58 39 10 0 40 26 33 39 8 32 40 28 1 -0.18 161 0 0 40 5 36 13 49 59.4 12 72 -57 39 27 29 40 43 47 39 26 1 40 45 15 -0.18 162 0 0 40 22 25 13 50 0.1 13 72 -57 39 44 26 41 0 29 39 42 59 41 1 57 -0.18 163 0 0 40 38 44 13 50 1.0 14 73 -56 40 0 52 41 16 40 39 59 25 41 18 7 -0.18 164 0 0 40 54 31 13 50 1.8 14 74 -56 40 16 46 41 32 20 40 15 19 41 33 47 -0.18 165 0 0 41 9 46 13 50 2.7 15 74 -55 40 32 9 41 47 28 40 30 42 41 48 55 -0.18 166 0 0 41 24 31 13 50 3.6 16 75 -55 40 47 1 42 2 6 40 45 34 42 3 33 -0.18 167 0 0 41 38 46 13 50 4.6 17 76 -54 41 1 22 42 16 14 40 59 56 42 17 40 -0.18 168 0 0 41 52 29 13 50 5.6 18 76 -53 41 15 12 42 29 51 41 13 46 42 31 17 -0.18 169 0 0 42 5 43 13 50 6.7 18 77 -53 41 28 32 42 42 59 41 27 6 42 44 24 -0.18 170 0 0 42 18 27 13 50 7.8 19 78 -52 41 41 22 42 55 36 41 39 56 42 57 2 -0.18 171 0 0 42 30 41 13 50 8.9 20 79 -52 41 53 41 43 7 44 41 52 16 43 9 10 -0.18 172 0 0 42 42 25 13 50 10.1 21 79 -51 42 5 32 43 19 23 42 4 7 43 20 48 -0.18 173 0 0 42 53 40 13 50 11.3 21 80 -50 42 16 52 43 30 32 42 15 28 43 31 57 -0.17 174 0 0 43 4 26 13 50 12.5 22 81 -50 42 27 44 43 41 13 42 26 19 43 42 38 -0.17 175 0 0 43 14 44 13 50 13.8 23 81 -49 42 38 6 43 51 25 42 36 42 43 52 50 -0.17 176 0 0 43 24 32 13 50 15.1 24 82 -49 42 47 59 44 1 9 42 46 35 44 2 33 -0.17 177 0 0 43 33 52 13 50 16.4 24 83 -48 42 57 24 44 10 24 42 56 0 44 11 48 -0.17 178 0 0 43 42 44 13 50 17.8 25 84 -47 43 6 20 44 19 11 43 4 57 44 20 35 -0.17 179 0 0 43 51 8 13 50 19.2 26 84 -47 43 14 48 44 27 31 43 13 25 44 28 55 -0.17 -180 0 0 43 59 3 13 50 20.6 27 85 -46 43 22 48 44 35 22 43 21 25 44 36 46 -0.17 -179 0 0 44 6 31 13 50 22.0 27 86 -45 43 30 20 44 42 46 43 28 56 44 44 10 -0.17 -178 0 0 44 13 31 13 50 23.5 28 86 -45 43 37 24 44 49 43 43 36 1 44 51 6 -0.17 -177 0 0 44 20 4 13 50 25.0 29 87 -44 43 44 0 44 56 12 43 42 37 44 57 36 -0.17 -176 0 0 44 26 10 13 50 26.6 30 88 -44 43 50 8 45 2 15 43 48 46 45 3 38 -0.17 -175 0 0 44 31 48 13 50 28.2 30 89 -43 43 55 50 45 7 50 43 54 27 45 9 13 -0.17 -174 0 0 44 36 59 13 50 29.8 31 89 -42 44 1 3 45 12 58 43 59 41 45 14 21 -0.17 -173 0 0 44 41 43 13 50 31.4 32 90 -42 44 5 50 45 17 40 44 4 27 45 19 3 -0.17 -172 0 0 44 46 0 13 50 33.1 32 91 -41 44 10 9 45 21 55 44 8 47 45 23 17 -0.17 -171 0 0 44 49 51 13 50 34.8 33 92 -40 44 14 2 45 25 43 44 12 40 45 27 6 -0.17 -170 0 0 44 53 14 13 50 36.5 34 92 -40 44 17 27 45 29 5 44 16 5 45 30 27 -0.17 -169 0 0 44 56 11 13 50 38.3 35 93 -39 44 20 26 45 32 0 44 19 4 45 33 23 -0.17 -168 0 0 44 58 42 13 50 40.1 35 94 -39 44 22 58 45 34 29 44 21 36 45 35 52 -0.17 -167 0 0 45 0 46 13 50 41.9 36 95 -38 44 25 3 45 36 32 44 23 41 45 37 54 -0.17 -166 0 0 45 2 23 13 50 43.7 37 95 -37 44 26 41 45 38 8 44 25 19 45 39 31 -0.17 -165 0 0 45 3 34 13 50 45.6 37 96 -37 44 27 53 45 39 19 44 26 30 45 40 41 -0.17 -164 0 0 45 4 18 13 50 47.5 38 97 -36 44 28 37 45 40 3 44 27 15 45 41 25 -0.17 -163 0 0 45 4 36 13 50 49.4 39 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Uncertainty in time = +/- 0 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: UCAC4 559-045648 * constellation : Cancer * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 08 25 37.5676 DE: +21 40 46.047 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 08 25 37.5676 DE: +21 40 46.047 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (654) Zelinda asteroid class: approx. diameter [km]: 130 approx. diameter ["]: 0.103 distance from Earth [AU]: 1.74060 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#121 date of fit: 2022 Sep 21 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): 0.006", 0.002", 119.044° remarks: * orbital elements for (654)Zelinda : Mean anomaly = 333.7525417560 deg Arg. of pericenter = 214.5746538995 deg Long. of node = 278.3342698608 deg Inclination = 18.0944393976 deg Eccentricity = 0.2308549861 Semimajor axis = 2.2971428796 AU Perihelion dist = 1.7668359920 AU Mag: H = 8.66, G = 0.15 Epoch of elements : MJD 59869.57916667 TDT (2022 Oct 17.5792) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1212022Sep21,5.02,2022,10,17,13.898515,0.076966,0.149893,12.890170,-6.984588,-0.004894,0.001234,0.000000,0.000000 -107.7926,21.6062,-32.14,-9.38,False UCAC4 559-045648,8.42710207,21.6794577,0.00,11.75,0.00,0.0,0,K,8.44898533,21.6062083,1.23,0.00,0,0,0 654,Zelinda,12.56,130.3,1.7406,0,0,4.671,-35.30,,6.2,0 0,333.5886,2022,10,17,214.5747,278.3343,18.0944,0.23085,2.29714,1.76684,8.66,5.0,0.15 1.019,0.0063,0.0020,119,0.0020,Known errors,-1.00,-1,-1,-1 20221017_045648,59868.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org