IOTA/IOTA-ES occultation update for (171) Ophelia / UCAC4 470-046027 event on 2022 Jun 03, 13:55 UT Visible from W Australia Summary ------- On 2022 Jun 03 UT, the 114.4 km diameter asteroid (171) Ophelia will occult a 12.4 mag star in the constellation Virgo for observers along a path across W Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.59 mag to 13.74 mag (the magnitude of the asteroid) for at most 10.760 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 Jun 03, 13:45 - 2022 Jun 03, 14:05 * geocentric midpoint of event [JD]: 2459734.07996475 * magnitude of target star: 12.44 * magnitude drop [mag]: 1.59 * estimated maximum duration [s]: 10.760 * Moon: 15 % sunlit, 59° distance * Sun: 104° distance * rough path description: W Australia The occultation path -------------------- * approximate projected width [km]: 116 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.003", 114°) * approx speed of asteroid's shadow [km/s]: 10.6281 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 470-046027 by 171 Ophelia on 2022 Jun 3 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 - 11 0 0 19 26 2 13 45 17.0 0 86 75 18 54 23 19 57 37 18 50 54 20 1 5 .... - 10 0 0 19 29 48 13 45 17.1 1 86 74 18 58 10 20 1 22 18 54 42 20 4 50 0.08 - 9 0 0 19 33 4 13 45 17.3 2 87 73 19 1 27 20 4 37 18 57 58 20 8 5 0.13 - 8 0 0 19 35 49 13 45 17.8 3 87 72 19 4 13 20 7 22 19 0 44 20 10 50 0.15 - 7 0 0 19 38 4 13 45 18.4 4 87 71 19 6 28 20 9 36 19 3 0 20 13 4 0.16 - 6 0 0 19 39 47 13 45 19.1 5 88 70 19 8 12 20 11 19 19 4 44 20 14 47 0.17 - 5 0 0 19 41 0 13 45 20.1 6 88 69 19 9 25 20 12 32 19 5 57 20 16 0 0.17 - 4 0 0 19 41 42 13 45 21.2 7 88 69 19 10 8 20 13 14 19 6 39 20 16 42 0.18 - 3 0 0 19 41 53 13 45 22.4 8 89 68 19 10 19 20 13 25 19 6 50 20 16 53 0.18 - 2 0 0 19 41 34 13 45 23.8 9 89 67 19 9 58 20 13 5 19 6 30 20 16 33 0.18 - 1 0 0 19 40 43 13 45 25.4 10 89 66 19 9 7 20 12 15 19 5 38 20 15 42 0.18 0 0 0 19 39 20 13 45 27.2 10 90 65 19 7 44 20 10 53 19 4 16 20 14 21 0.18 1 0 0 19 37 27 13 45 29.1 11 90 64 19 5 50 20 9 0 19 2 21 20 12 28 0.19 2 0 0 19 35 2 13 45 31.2 12 90 63 19 3 25 20 6 37 18 59 56 20 10 5 0.19 3 0 0 19 32 6 13 45 33.5 13 91 62 19 0 28 20 3 42 18 56 59 20 7 10 0.19 4 0 0 19 28 39 13 45 35.9 14 91 61 18 56 59 20 0 15 18 53 30 20 3 44 0.19 5 0 0 19 24 40 13 45 38.5 15 91 60 18 52 58 19 56 18 18 49 29 19 59 46 0.19 6 0 0 19 20 9 13 45 41.3 16 92 59 18 48 26 19 51 48 18 44 57 19 55 17 0.19 7 0 0 19 15 7 13 45 44.2 17 92 58 18 43 22 19 46 48 18 39 53 19 50 17 0.19 8 0 0 19 9 32 13 45 47.3 18 92 57 18 37 46 19 41 15 18 34 16 19 44 44 0.19 9 0 0 19 3 26 13 45 50.6 19 92 56 18 31 38 19 35 11 18 28 8 19 38 40 0.19 10 0 0 18 56 48 13 45 54.0 20 93 55 18 24 58 19 28 35 18 21 27 19 32 5 0.19 11 0 0 18 49 38 13 45 57.6 21 93 54 18 17 45 19 21 27 18 14 14 19 24 57 0.19 12 0 0 18 41 56 13 46 1.4 22 93 53 18 10 0 19 13 47 18 6 29 19 17 17 0.19 13 0 0 18 33 41 13 46 5.4 23 94 52 18 1 43 19 5 35 17 58 11 19 9 6 0.19 14 0 0 18 24 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13 -31 8 55 -29 51 23 0.18 118 0 0 -30 54 54 14 2 51.7 37 303 -61 -31 29 45 -30 20 7 -31 33 35 -30 16 17 0.18 119 0 0 -31 19 11 14 2 57.8 36 302 -62 -31 53 56 -30 44 30 -31 57 46 -30 40 42 0.18 120 0 0 -31 42 58 14 3 3.8 35 302 -63 -32 17 36 -31 8 23 -32 21 25 -31 4 35 0.18 121 0 0 -32 6 14 14 3 9.5 34 301 -63 -32 40 47 -31 31 46 -32 44 35 -31 27 59 0.18 122 0 0 -32 29 0 14 3 15.1 33 301 -64 -33 3 26 -31 54 38 -33 7 14 -31 50 52 0.18 123 0 0 -32 51 16 14 3 20.5 32 300 -65 -33 25 36 -32 17 0 -33 29 22 -32 13 14 0.18 124 0 0 -33 13 1 14 3 25.7 31 299 -66 -33 47 15 -32 38 52 -33 51 1 -32 35 7 0.18 125 0 0 -33 34 16 14 3 30.7 30 299 -66 -34 8 24 -33 0 13 -34 12 9 -32 56 28 0.18 126 0 0 -33 55 1 14 3 35.6 29 298 -67 -34 29 2 -33 21 4 -34 32 47 -33 17 20 0.18 127 0 0 -34 15 16 14 3 40.3 29 297 -68 -34 49 11 -33 41 24 -34 52 55 -33 37 41 0.18 128 0 0 -34 35 1 14 3 44.8 28 297 -68 -35 8 50 -34 1 15 -35 12 33 -33 57 33 0.18 129 0 0 -34 54 15 14 3 49.2 27 296 -69 -35 27 59 -34 20 36 -35 31 41 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142 0 0 -38 20 10 14 4 32.0 16 288 -73 -38 52 46 -37 47 37 -38 56 21 -37 44 2 0.18 143 0 0 -38 32 42 14 4 34.3 15 287 -73 -39 5 13 -38 0 13 -39 8 48 -37 56 39 0.18 144 0 0 -38 44 46 14 4 36.5 14 287 -73 -39 17 14 -38 12 21 -39 20 48 -38 8 48 0.18 145 0 0 -38 56 23 14 4 38.5 13 286 -73 -39 28 46 -38 24 2 -39 32 20 -38 20 29 0.18 146 0 0 -39 7 32 14 4 40.4 12 285 -73 -39 39 52 -38 35 16 -39 43 26 -38 31 43 0.18 147 0 0 -39 18 15 14 4 42.2 12 285 -73 -39 50 31 -38 46 3 -39 54 4 -38 42 30 0.18 148 0 0 -39 28 31 14 4 43.9 11 284 -73 -40 0 44 -38 56 22 -40 4 16 -38 52 50 0.18 149 0 0 -39 38 21 14 4 45.4 10 284 -73 -40 10 30 -39 6 15 -40 14 2 -39 2 44 0.18 150 0 0 -39 47 44 14 4 46.8 9 283 -72 -40 19 49 -39 15 41 -40 23 21 -39 12 10 0.19 151 0 0 -39 56 40 14 4 48.1 8 282 -72 -40 28 42 -39 24 41 -40 32 14 -39 21 10 0.19 152 0 0 -40 5 10 14 4 49.3 8 282 -72 -40 37 10 -39 33 14 -40 40 41 -39 29 44 0.19 153 0 0 -40 13 15 14 4 50.3 7 281 -72 -40 45 11 -39 41 22 -40 48 42 -39 37 52 0.19 154 0 0 -40 20 53 14 4 51.3 6 280 -71 -40 52 47 -39 49 3 -40 56 18 -39 45 33 0.19 155 0 0 -40 28 6 14 4 52.1 5 280 -71 -40 59 57 -39 56 18 -41 3 28 -39 52 49 0.19 156 0 0 -40 34 53 14 4 52.8 5 279 -71 -41 6 42 -40 3 8 -41 10 12 -39 59 39 0.19 157 0 0 -40 41 15 14 4 53.4 4 278 -70 -41 13 1 -40 9 32 -41 16 31 -40 6 3 0.19 158 0 0 -40 47 12 14 4 53.9 3 278 -70 -41 18 56 -40 15 31 -41 22 25 -40 12 2 0.20 159 0 0 -40 52 43 14 4 54.3 2 277 -69 -41 24 25 -40 21 4 -41 27 54 -40 17 35 0.20 160 0 0 -40 57 49 14 4 54.5 2 276 -69 -41 29 29 -40 26 12 -41 32 58 -40 22 43 0.21 161 0 0 -41 2 30 14 4 54.7 1 276 -68 -41 34 9 -40 30 54 -41 37 38 -40 27 26 0.24 162 0 0 -41 6 46 14 4 54.7 0 275 -68 .. .. .. -40 35 12 .. .. .. -40 31 44 4.06 Uncertainty in time = +/- 2 secs Prediction of 2022 Apr 15.8 Data for the target star ------------------------ * name: UCAC4 470-046027 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 11 53 15.8093 DE: +03 58 47.700 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 11 53 15.8090 DE: +03 58 47.702 * position source: Gaia EDR3 * 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: (171) Ophelia asteroid class: approx. diameter [km]: 114 approx. diameter ["]: 0.066 distance from Earth [AU]: 2.37220 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#129 date of fit: 2022 Apr 11 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): 0.013", 0.003", 113.538° remarks: * orbital elements for (171)Ophelia : Mean anomaly = 32.0291309137 deg Arg. of pericenter = 55.6768262791 deg Long. of node = 100.4729433948 deg Inclination = 2.5464758563 deg Eccentricity = 0.1320145377 Semimajor axis = 3.1314171561 AU Perihelion dist = 2.7180245678 AU Mag: H = 8.66, G = 0.15 Epoch of elements : MJD 59733.57986111 TDT (2022 Jun 03.5799) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1292022Apr11,10.76,2022,6,3,13.919154,-0.090651,-0.164677,5.185172,-3.016542,0.004955,-0.002230,0.000000,0.000000 77.8118,3.8564,-29.23,22.36,False UCAC4 470-046027,11.88772475,3.9799170,0.00,12.44,0.00,0.0,4,,11.90675830,3.8563951,1.59,0.00,0,0,0 171,Ophelia,13.74,114.4,2.3722,0,0,1.285,-11.19,,5.8 0,31.9260,2022,6,3,55.6768,100.4729,2.5465,0.13201,3.13142,2.71802,8.61,5.0,0.15 1.055,0.0133,0.0033,114,0.0037,Known errors,-1.00,-1,-1,-1 20220603_046027,59684.83 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Apr 15, 19:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org