IOTA/IOTA-ES occultation update for (34) Circe / UCAC4 372-138100 event on 2023 May 09, 07:58 UT Visible from USA, Central America, South America Summary ------- On 2023 May 09 UT, the 118.5 km diameter asteroid (34) Circe will occult a 12.9 mag star in the constellation Scutum for observers along a path across USA, Central America, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.00 mag to 13.31 mag (the magnitude of the asteroid) for at most 39.320 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: 2023 May 09, 07:22 - 2023 May 09, 08:34 * geocentric midpoint of event [JD]: 2460073.83230400 * magnitude of target star: 12.86 * magnitude drop [mag]: 1.00 * estimated maximum duration [s]: 39.320 * Moon: 85 % sunlit, 14° distance * Sun: 128° distance * rough path description: USA, Central America, South America The occultation path -------------------- * approximate projected width [km]: 119 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 7.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.012", 87°) * approx speed of asteroid's shadow [km/s]: 3.0150 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 372-138100 by 34 Circe on 2023 May 9 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 -138 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 57 58 49 .. .. .. 57 42 3 .... -137 0 0 58 17 24 8 33 29.5 0 121 -14 .. .. .. 57 39 39 .. .. .. 57 22 45 .... -136 0 0 57 57 48 8 33 29.3 1 122 -15 58 35 56 57 19 43 58 53 3 57 2 41 0.04 -135 0 0 57 37 25 8 33 28.8 2 123 -15 58 15 53 56 59 1 58 33 9 56 41 50 -0.04 -134 0 0 57 16 15 8 33 28.0 2 124 -15 57 55 4 56 37 31 58 12 28 56 20 11 -0.07 -133 0 0 56 54 16 8 33 27.0 3 125 -16 57 33 25 56 15 11 57 50 59 55 57 42 -0.09 -132 0 0 56 31 27 8 33 25.7 4 125 -16 57 10 58 55 52 1 57 28 41 55 34 23 -0.10 -131 0 0 56 7 47 8 33 24.0 4 126 -17 56 47 39 55 27 59 57 5 32 55 10 11 -0.11 -130 0 0 55 43 13 8 33 22.0 5 127 -17 56 23 28 55 3 3 56 41 31 54 45 5 -0.12 -129 0 0 55 17 45 8 33 19.7 6 128 -18 55 58 22 54 37 12 56 16 36 54 19 4 -0.12 -128 0 0 54 51 20 8 33 17.0 6 129 -18 55 32 21 54 10 25 55 50 45 53 52 6 -0.13 -127 0 0 54 23 58 8 33 13.8 7 130 -18 55 5 23 53 42 39 55 23 58 53 24 10 -0.13 -126 0 0 53 55 37 8 33 10.3 8 130 -19 54 37 26 53 13 54 54 56 12 52 55 14 -0.13 -125 0 0 53 26 15 8 33 6.3 9 131 -19 54 8 28 52 44 8 54 27 26 52 25 17 -0.14 -124 0 0 52 55 50 8 33 1.9 9 132 -20 53 38 29 52 13 18 53 57 37 51 54 17 -0.14 -123 0 0 52 24 22 8 32 57.0 10 133 -20 53 7 26 51 41 24 53 26 46 51 22 12 -0.14 -122 0 0 51 51 47 8 32 51.6 11 133 -21 52 35 17 51 8 25 52 54 48 50 49 1 -0.15 -121 0 0 51 18 5 8 32 45.6 12 134 -21 52 2 1 50 34 17 52 21 44 50 14 42 -0.15 -120 0 0 50 43 15 8 32 39.0 13 135 -22 51 27 36 49 59 0 51 47 32 49 39 14 -0.15 -119 0 0 50 7 13 8 32 31.9 13 136 -22 50 52 2 49 22 33 51 12 9 49 2 35 -0.15 -118 0 0 49 30 0 8 32 24.1 14 137 -23 50 15 15 48 44 53 50 35 34 48 24 44 -0.15 -117 0 0 48 51 33 8 32 15.6 15 137 -23 49 37 14 48 6 0 49 57 46 47 45 39 -0.16 -116 0 0 48 11 51 8 32 6.5 16 138 -24 48 57 59 47 25 52 49 18 42 47 5 19 -0.16 -115 0 0 47 30 52 8 31 56.6 17 139 -24 48 17 27 46 44 27 48 38 22 46 23 43 -0.16 -114 0 0 46 48 36 8 31 45.9 18 139 -25 47 35 37 46 1 45 47 56 45 45 40 49 -0.16 -113 0 0 46 5 1 8 31 34.4 19 140 -25 46 52 28 45 17 44 47 13 48 44 56 36 -0.16 -112 0 0 45 20 6 8 31 22.1 20 141 -26 46 7 59 44 32 23 46 29 31 44 11 5 -0.16 -111 0 0 44 33 50 8 31 8.9 21 141 -26 45 22 9 43 45 42 45 43 52 43 24 12 -0.17 -110 0 0 43 46 12 8 30 54.7 22 142 -27 44 34 57 42 57 40 44 56 51 42 35 59 -0.17 -109 0 0 42 57 13 8 30 39.6 23 143 -27 43 46 22 42 8 16 44 8 28 41 46 25 -0.17 -108 0 0 42 6 51 8 30 23.5 24 143 -28 42 56 24 41 17 31 43 18 41 40 55 29 -0.17 -107 0 0 41 15 6 8 30 6.4 25 144 -28 42 5 2 40 25 23 42 27 30 40 3 11 -0.17 -106 0 0 40 21 58 8 29 48.2 26 145 -29 41 12 17 39 31 53 41 34 55 39 9 31 -0.17 -105 0 0 39 27 28 8 29 28.9 28 145 -29 40 18 9 38 37 1 40 40 57 38 14 30 -0.17 -104 0 0 38 31 35 8 29 8.4 29 146 -30 39 22 38 37 40 48 39 45 35 37 18 8 -0.17 -103 0 0 37 34 22 8 28 46.8 30 147 -30 38 25 44 36 43 15 38 48 50 36 20 27 -0.18 -102 0 0 36 35 48 8 28 24.0 31 147 -31 37 27 29 35 44 23 37 50 43 35 21 27 -0.18 -101 0 0 35 35 55 8 28 0.0 32 148 -31 36 27 53 34 44 13 36 51 16 34 21 9 -0.18 -100 0 0 34 34 45 8 27 34.7 34 148 -32 35 26 59 33 42 47 35 50 29 33 19 36 -0.18 - 99 0 0 33 32 19 8 27 8.2 35 149 -32 34 24 48 32 40 6 34 48 25 32 16 48 -0.18 - 98 0 0 32 28 39 8 26 40.4 36 149 -33 33 21 23 31 36 13 33 45 6 31 12 50 -0.18 - 97 0 0 31 23 48 8 26 11.3 38 150 -33 32 16 44 30 31 11 32 40 33 30 7 41 -0.18 - 96 0 0 30 17 49 8 25 40.9 39 150 -34 31 10 56 29 25 1 31 34 50 29 1 27 -0.18 - 95 0 0 29 10 44 8 25 9.2 40 151 -34 30 4 0 28 17 46 30 27 58 27 54 8 -0.18 - 94 0 0 28 2 36 8 24 36.3 42 152 -35 28 56 1 27 9 30 29 20 2 26 45 49 -0.18 - 93 0 0 26 53 29 8 24 2.0 43 152 -35 27 47 0 26 0 16 28 11 5 25 36 32 -0.18 - 92 0 0 25 43 26 8 23 26.5 44 153 -35 26 37 2 24 50 8 27 1 10 24 26 21 -0.17 - 91 0 0 24 32 31 8 22 49.7 46 153 -36 25 26 11 23 39 9 25 50 20 23 15 20 -0.17 - 90 0 0 23 20 47 8 22 11.7 47 154 -36 24 14 30 22 27 22 24 38 40 22 3 32 -0.17 - 89 0 0 22 8 18 8 21 32.4 49 154 -36 23 2 2 21 14 52 23 26 13 20 51 1 -0.17 - 88 0 0 20 55 9 8 20 52.1 50 155 -37 21 48 53 20 1 43 22 13 4 19 37 52 -0.17 - 87 0 0 19 41 24 8 20 10.5 51 155 -37 20 35 7 18 47 58 20 59 17 18 24 8 -0.17 - 86 0 0 18 27 6 8 19 27.9 53 156 -37 19 20 47 17 33 43 19 44 55 17 9 53 -0.17 - 85 0 0 17 12 20 8 18 44.3 54 156 -37 18 5 57 16 19 0 18 30 4 15 55 12 -0.17 - 84 0 0 15 57 11 8 17 59.7 56 157 -37 16 50 43 15 3 55 17 14 48 14 40 8 -0.16 - 83 0 0 14 41 41 8 17 14.1 57 157 -38 15 35 8 13 48 31 15 59 11 13 24 46 -0.16 - 82 0 0 13 25 57 8 16 27.6 59 158 -38 14 19 17 12 32 52 14 43 16 12 9 10 -0.16 - 81 0 0 12 10 1 8 15 40.3 60 158 -38 13 3 14 11 17 3 13 27 10 10 53 24 -0.16 - 80 0 0 10 53 58 8 14 52.3 62 159 -38 11 47 3 10 1 8 12 10 55 9 37 32 -0.15 - 79 0 0 9 37 52 8 14 3.5 63 160 -38 10 30 48 8 45 10 10 54 36 8 21 38 -0.15 - 78 0 0 8 21 46 8 13 14.2 65 160 -38 9 14 33 7 29 14 9 38 16 7 5 45 -0.15 - 77 0 0 7 5 46 8 12 24.2 66 161 -38 7 58 22 6 13 23 8 22 1 5 49 58 -0.15 - 76 0 0 5 49 54 8 11 33.8 67 162 -37 6 42 19 4 57 41 7 5 53 4 34 21 -0.14 - 75 0 0 4 34 14 8 10 42.9 69 163 -37 5 26 28 3 42 12 5 49 56 3 18 56 -0.14 - 74 0 0 3 18 50 8 9 51.6 70 164 -37 4 10 52 2 26 59 4 34 14 2 3 48 -0.14 - 73 0 0 2 3 45 8 9 0.1 72 166 -37 2 55 35 1 12 5 3 18 52 0 49 0 -0.14 - 72 0 0 0 49 2 8 8 8.3 73 167 -37 1 40 39 - 0 2 25 2 3 50 - 0 25 25 -0.13 - 71 0 0 - 0 25 15 8 7 16.4 74 169 -36 0 26 9 - 1 16 29 0 49 15 - 1 39 24 -0.13 - 70 0 0 - 1 39 3 8 6 24.4 76 171 -36 - 0 47 52 - 2 30 5 - 0 24 53 - 2 52 54 -0.13 - 69 0 0 - 2 52 19 8 5 32.3 77 174 -36 - 2 1 22 - 3 43 8 - 1 38 29 - 4 5 51 -0.12 - 68 0 0 - 4 5 1 8 4 40.3 78 177 -35 - 3 14 18 - 4 55 36 - 2 51 32 - 5 18 13 -0.12 - 67 0 0 - 5 17 5 8 3 48.4 80 180 -35 - 4 26 36 - 6 7 27 - 4 3 57 - 6 29 58 -0.12 - 66 0 0 - 6 28 30 8 2 56.6 81 185 -35 - 5 38 16 - 7 18 37 - 5 15 43 - 7 41 2 -0.12 - 65 0 0 - 7 39 12 8 2 5.0 82 191 -34 - 6 49 13 - 8 29 5 - 6 26 47 - 8 51 24 -0.11 - 64 0 0 - 8 49 10 8 1 13.7 83 199 -34 - 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260 15 -51 6 32 -52 11 37 -50 51 56 -52 26 10 -0.12 34 0 0 -51 33 11 7 24 11.9 11 259 15 -51 0 32 -52 5 47 -50 45 54 -52 20 22 -0.12 35 0 0 -51 26 41 7 24 7.4 11 258 16 -50 53 58 -51 59 23 -50 39 17 -52 14 0 -0.12 36 0 0 -51 19 38 7 24 3.1 10 258 16 -50 46 48 -51 52 25 -50 32 5 -52 7 5 -0.12 37 0 0 -51 11 59 7 23 59.1 10 257 16 -50 39 4 -51 44 52 -50 24 18 -51 59 35 -0.12 38 0 0 -51 3 45 7 23 55.3 9 256 17 -50 30 43 -51 36 45 -50 15 54 -51 51 31 -0.12 39 0 0 -50 54 55 7 23 51.7 8 255 17 -50 21 45 -51 28 1 -50 6 53 -51 42 51 -0.12 40 0 0 -50 45 28 7 23 48.3 8 255 18 -50 12 11 -51 18 42 -49 57 15 -51 33 34 -0.12 41 0 0 -50 35 23 7 23 45.2 7 254 18 -50 1 58 -51 8 46 -49 46 59 -51 23 42 -0.13 42 0 0 -50 24 41 7 23 42.3 6 253 19 -49 51 7 -50 58 11 -49 36 4 -51 13 12 -0.13 43 0 0 -50 13 19 7 23 39.7 6 252 19 -49 39 36 -50 46 59 -49 24 29 -51 2 3 -0.13 44 0 0 -50 1 18 7 23 37.4 5 252 19 -49 27 25 -50 35 7 -49 12 13 -50 50 16 -0.13 45 0 0 -49 48 36 7 23 35.3 4 251 20 -49 14 33 -50 22 36 -48 59 16 -50 37 49 -0.13 46 0 0 -49 35 12 7 23 33.5 4 250 20 -49 0 58 -50 9 23 -48 45 37 -50 24 41 -0.13 47 0 0 -49 21 6 7 23 32.0 3 249 21 -48 46 41 -49 55 28 -48 31 14 -50 10 51 -0.13 48 0 0 -49 6 17 7 23 30.7 2 249 21 -48 31 39 -49 40 51 -48 16 7 -49 56 19 -0.12 49 0 0 -48 50 42 7 23 29.8 2 248 22 -48 15 52 -49 25 29 -48 0 14 -49 41 3 -0.12 50 0 0 -48 34 22 7 23 29.2 1 247 22 -47 59 18 -49 9 22 -47 43 35 -49 25 2 -0.10 51 0 0 -48 17 15 7 23 28.9 0 246 23 .. .. .. -48 52 28 .. .. .. -49 8 14 0.09 Uncertainty in time = +/- 10 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 372-138100 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 41 43.3672 DE: -15 42 10.482 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 41 43.3673 DE: -15 42 10.482 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.9 * B mag [mag]: 13.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (34) Circe asteroid class: approx. diameter [km]: 119 approx. diameter ["]: 0.081 distance from Earth [AU]: 2.01630 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#103 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): 0.020", 0.012", 87.401° remarks: * orbital elements for (34)Circe : Mean anomaly = 97.1059398197 deg Arg. of pericenter = 330.0189736603 deg Long. of node = 184.3313277170 deg Inclination = 5.4973902275 deg Eccentricity = 0.1066089599 Semimajor axis = 2.6867335766 AU Perihelion dist = 2.4003037046 AU Mag: H = 8.68, G = 0.15 Epoch of elements : MJD 60073.33231120 TDT (2023 May 09.3323) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1032023Apr24,39.32,2023,5,9,7.975296,0.084419,0.056267,-0.944012,1.415920,-0.004381,-0.000767,0.000001,0.000000 -65.7420,-15.6816,59.49,17.32,False UCAC4 372-138100,18.69537978,-15.7029118,13.69,12.86,12.41,0.0,0,,18.71776476,-15.6815708,1.00,1.00,0,0,0 34,Circe,13.31,118.5,2.0163,0,0,-0.285,6.18,,5.8,0 0,97.0316,2023,5,9,330.0190,184.3313,5.4974,0.10661,2.68673,2.40030,8.69,5.0,0.15 1.224,0.0200,0.0117,87,0.0182,Known errors,0.86,-1,-1,-1 20230509_138100,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org