IOTA/IOTA-ES occultation update for (34) Circe / UCAC4 369-143101 event on 2023 Apr 26, 07:31 UT Visible from E Canada, E USA, Mexico Summary ------- On 2023 Apr 26 UT, the 118.6 km diameter asteroid (34) Circe will occult a 13.6 mag star in the constellation Sagittarius for observers along a path across E Canada, E USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.71 mag to 13.52 mag (the magnitude of the asteroid) for at most 25.270 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 Apr 26, 07:17 - 2023 Apr 26, 07:44 * geocentric midpoint of event [JD]: 2460060.81355829 * magnitude of target star: 13.60 * magnitude drop [mag]: 0.71 * estimated maximum duration [s]: 25.270 * Moon: 36 % sunlit, 165° distance * Sun: 115° distance * rough path description: E Canada, E USA, Mexico The occultation path -------------------- * approximate projected width [km]: 213 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.011) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.011", 87°) * approx speed of asteroid's shadow [km/s]: 4.6915 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 369-143101 by 34 Circe on 2023 Apr 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 ' " Longitude Longitude Longitude Longitude .. .. .. 72 0 0 .. .. .... .. .. .. - 73 29 2 ... .. .. - 72 16 59 ... .. .. .... - 75 18 57 71 0 0 7 43 59.7 1 155 -1 - 72 15 42 - 78 32 13 - 71 8 36 - 79 48 27 .... - 74 6 18 70 0 0 7 43 58.5 2 156 -2 - 71 15 0 - 77 5 57 - 70 12 4 - 78 16 28 1.05 - 73 5 51 69 0 0 7 43 56.5 3 157 -2 - 70 24 45 - 75 54 3 - 69 25 25 - 76 59 49 1.18 - 72 15 34 68 0 0 7 43 53.7 4 158 -3 - 69 43 18 - 74 53 59 - 68 47 6 - 75 55 45 1.25 - 71 33 52 67 0 0 7 43 50.1 5 159 -3 - 69 9 19 - 74 3 50 - 68 15 52 - 75 2 9 1.28 - 70 59 30 66 0 0 7 43 45.7 6 159 -4 - 68 41 45 - 73 22 4 - 67 50 45 - 74 17 24 1.31 - 70 31 28 65 0 0 7 43 40.7 7 160 -4 - 68 19 45 - 72 47 31 - 67 30 56 - 73 40 14 1.32 - 70 8 58 64 0 0 7 43 34.9 8 160 -5 - 68 2 39 - 72 19 12 - 67 15 47 - 73 9 37 1.33 - 69 51 19 63 0 0 7 43 28.4 9 160 -6 - 67 49 51 - 71 56 22 - 67 4 45 - 72 44 43 1.34 - 69 37 58 62 0 0 7 43 21.2 10 160 -6 - 67 40 53 - 71 38 22 - 66 57 22 - 72 24 52 1.35 - 69 28 27 61 0 0 7 43 13.3 11 160 -7 - 67 35 20 - 71 24 39 - 66 53 16 - 72 9 29 1.35 - 69 22 23 60 0 0 7 43 4.7 12 160 -8 - 67 32 52 - 71 14 46 - 66 52 8 - 71 58 6 1.36 - 69 19 26 59 0 0 7 42 55.4 13 160 -8 - 67 33 13 - 71 8 21 - 66 53 41 - 71 50 19 1.36 - 69 19 19 58 0 0 7 42 45.4 14 160 -9 - 67 36 6 - 71 5 5 - 66 57 40 - 71 45 49 1.37 - 69 21 47 57 0 0 7 42 34.8 15 160 -10 - 67 41 20 - 71 4 40 - 67 3 55 - 71 44 17 -1.37 - 69 26 39 56 0 0 7 42 23.5 16 160 -10 - 67 48 43 - 71 6 54 - 67 12 14 - 71 45 29 -1.37 - 69 33 43 55 0 0 7 42 11.5 17 159 -11 - 67 58 7 - 71 11 33 - 67 22 29 - 71 49 12 -1.37 - 69 42 51 54 0 0 7 41 58.8 18 159 -12 - 68 9 22 - 71 18 29 - 67 34 32 - 71 55 16 -1.37 - 69 53 55 53 0 0 7 41 45.4 19 159 -13 - 68 22 24 - 71 27 31 - 67 48 17 - 72 3 31 -1.38 - 70 6 48 52 0 0 7 41 31.4 19 158 -14 - 68 37 4 - 71 38 32 - 68 3 37 - 72 13 49 -1.38 - 70 21 23 51 0 0 7 41 16.6 20 158 -14 - 68 53 19 - 71 51 27 - 68 20 29 - 72 26 4 -1.38 - 70 37 38 50 0 0 7 41 1.2 21 157 -15 - 69 11 4 - 72 6 8 - 68 38 48 - 72 40 9 -1.38 - 70 55 27 49 0 0 7 40 45.2 22 157 -16 - 69 30 16 - 72 22 31 - 68 58 30 - 72 56 0 -1.39 - 71 14 46 48 0 0 7 40 28.4 23 156 -17 - 69 50 51 - 72 40 33 - 69 19 34 - 73 13 32 -1.39 - 71 35 33 47 0 0 7 40 11.0 24 156 -18 - 70 12 47 - 73 0 11 - 69 41 55 - 73 32 43 -1.39 - 71 57 47 46 0 0 7 39 52.9 24 155 -19 - 70 36 2 - 73 21 21 - 70 5 34 - 73 53 29 -1.39 - 72 21 24 45 0 0 7 39 34.1 25 154 -20 - 71 0 36 - 73 44 2 - 70 30 28 - 74 15 48 -1.40 - 72 46 24 44 0 0 7 39 14.7 26 154 -21 - 71 26 25 - 74 8 12 - 70 56 37 - 74 39 40 -1.40 - 73 12 47 43 0 0 7 38 54.5 27 153 -22 - 71 53 32 - 74 33 51 - 71 24 0 - 75 5 2 -1.40 - 73 40 31 42 0 0 7 38 33.7 27 152 -23 - 72 21 54 - 75 0 58 - 71 52 36 - 75 31 55 -1.41 - 74 9 37 41 0 0 7 38 12.2 28 151 -24 - 72 51 33 - 75 29 33 - 72 22 27 - 76 0 19 -1.41 - 74 40 7 40 0 0 7 37 50.0 29 150 -25 - 73 22 28 - 75 59 37 - 72 53 34 - 76 30 13 -1.42 - 75 12 0 39 0 0 7 37 27.1 29 150 -26 - 73 54 42 - 76 31 11 - 73 25 56 - 77 1 40 -1.42 - 75 45 18 38 0 0 7 37 3.5 30 149 -27 - 74 28 16 - 77 4 16 - 73 59 36 - 77 34 41 -1.42 - 76 20 4 37 0 0 7 36 39.2 30 148 -28 - 75 3 11 - 77 38 55 - 74 34 35 - 78 9 18 -1.43 - 76 56 20 36 0 0 7 36 14.2 31 147 -29 - 75 39 30 - 78 15 11 - 75 10 56 - 78 45 35 -1.43 - 77 34 9 35 0 0 7 35 48.4 31 146 -30 - 76 17 16 - 78 53 6 - 75 48 42 - 79 23 34 -1.44 - 78 13 35 34 0 0 7 35 21.9 32 144 -31 - 76 56 33 - 79 32 46 - 76 27 56 - 80 3 20 -1.44 - 78 54 42 33 0 0 7 34 54.7 32 143 -33 - 77 37 24 - 80 14 15 - 77 8 42 - 80 44 58 -1.45 - 79 37 36 32 0 0 7 34 26.8 33 142 -34 - 78 19 55 - 80 57 38 - 77 51 5 - 81 28 34 -1.46 - 80 22 23 31 0 0 7 33 58.1 33 141 -35 - 79 4 10 - 81 43 3 - 78 35 10 - 82 14 16 -1.46 - 81 9 10 30 0 0 7 33 28.5 33 140 -36 - 79 50 16 - 82 30 38 - 79 21 2 - 83 2 11 -1.47 - 81 58 4 29 0 0 7 32 58.2 33 138 -38 - 80 38 21 - 83 20 31 - 80 8 51 - 83 52 29 -1.47 - 82 49 17 28 0 0 7 32 27.1 34 137 -39 - 81 28 33 - 84 12 55 - 80 58 42 - 84 45 23 -1.48 - 83 42 59 27 0 0 7 31 55.1 34 136 -40 - 82 21 3 - 85 8 2 - 81 50 47 - 85 41 7 -1.49 - 84 39 24 26 0 0 7 31 22.2 34 134 -42 - 83 16 1 - 86 6 8 - 82 45 17 - 86 39 55 -1.49 - 85 38 48 25 0 0 7 30 48.4 34 133 -43 - 84 13 43 - 87 7 32 - 83 42 24 - 87 42 11 -1.50 - 86 41 30 24 0 0 7 30 13.6 34 131 -45 - 85 14 24 - 88 12 37 - 84 42 24 - 88 48 17 -1.51 - 87 47 53 23 0 0 7 29 37.7 33 130 -46 - 86 18 24 - 89 21 52 - 85 45 35 - 89 58 46 -1.52 - 88 58 28 22 0 0 7 29 0.7 33 128 -48 - 87 26 7 - 90 35 54 - 86 52 21 - 91 14 16 -1.52 - 90 13 52 21 0 0 7 28 22.5 33 127 -49 - 88 38 5 - 91 55 27 - 88 3 10 - 92 35 40 -1.53 - 91 34 50 20 0 0 7 27 43.0 32 125 -51 - 89 54 53 - 93 21 36 - 89 18 35 - 94 4 6 -1.54 - 93 2 28 19 0 0 7 27 1.9 31 124 -52 - 91 17 21 - 94 55 45 - 90 39 23 - 95 41 11 -1.55 - 94 38 11 18 0 0 7 26 19.1 30 122 -54 - 92 46 35 - 96 39 54 - 92 6 31 - 97 29 16 -1.55 - 96 24 3 17 0 0 7 25 34.2 29 120 -56 - 94 24 1 - 98 37 16 - 93 41 18 - 99 32 9 -1.56 - 98 23 20 16 0 0 7 24 46.6 28 119 -58 - 96 11 49 -100 53 8 - 95 25 37 -101 56 30 -1.57 -100 41 26 15 0 0 7 23 55.6 26 117 -60 - 98 13 20 -103 37 53 - 97 22 19 -104 56 30 -1.59 Latitude Latitude Latitude Latitude -101 0 0 14 52 41 7 23 49.0 26 117 -60 13 50 4 15 57 13 13 26 51 16 22 11 -1.54 -102 0 0 14 30 11 7 23 28.4 25 116 -61 13 28 13 15 34 0 13 5 14 15 58 41 -1.56 -103 0 0 14 9 26 7 23 8.5 25 116 -61 13 8 5 15 12 36 12 45 19 15 37 1 -1.56 -104 0 0 13 50 24 7 22 49.4 24 115 -62 12 49 36 14 52 58 12 27 2 15 17 8 -1.56 -105 0 0 13 33 2 7 22 31.1 23 114 -62 12 32 45 14 35 3 12 10 22 14 59 0 -1.56 -106 0 0 13 17 19 7 22 13.6 22 114 -63 12 17 30 14 18 50 11 55 17 14 42 34 -1.56 -107 0 0 13 3 13 7 21 56.8 21 113 -63 12 3 49 14 4 16 11 41 45 14 27 49 -1.56 -108 0 0 12 50 41 7 21 40.8 20 113 -64 11 51 40 13 51 19 11 29 45 14 14 42 -1.56 -109 0 0 12 39 43 7 21 25.5 19 113 -64 11 41 3 13 39 58 11 19 14 14 3 13 -1.56 -110 0 0 12 30 16 7 21 11.0 19 112 -64 11 31 55 13 30 12 11 10 13 13 53 18 -1.56 -111 0 0 12 22 20 7 20 57.3 18 112 -64 11 24 14 13 21 57 11 2 39 13 44 57 -1.55 -112 0 0 12 15 52 7 20 44.3 17 111 -64 11 18 1 13 15 14 10 56 31 13 38 7 -1.55 -113 0 0 12 10 53 7 20 32.0 16 111 -64 11 13 14 13 10 1 10 51 48 13 32 49 -1.55 -114 0 0 12 7 20 7 20 20.4 15 111 -64 11 9 52 13 6 17 10 48 29 13 29 0 -1.55 -115 0 0 12 5 13 7 20 9.6 14 110 -64 11 7 53 13 4 1 10 46 34 13 26 40 -1.55 -116 0 0 12 4 31 7 19 59.6 13 110 -64 11 7 18 13 3 12 10 46 1 13 25 48 -1.55 -117 0 0 12 5 13 7 19 50.3 12 110 -64 11 8 5 13 3 48 10 46 50 13 26 22 -1.55 -118 0 0 12 7 18 7 19 41.7 11 109 -63 11 10 14 13 5 50 10 49 0 13 28 23 -1.55 -119 0 0 12 10 46 7 19 33.8 10 109 -63 11 13 44 13 9 17 10 52 30 13 31 49 -1.55 -120 0 0 12 15 37 7 19 26.7 9 109 -63 11 18 34 13 14 7 10 57 20 13 36 39 -1.56 -121 0 0 12 21 49 7 19 20.3 8 109 -62 11 24 44 13 20 21 11 3 30 13 42 54 -1.56 -122 0 0 12 29 23 7 19 14.7 7 108 -62 11 32 14 13 27 59 11 10 58 13 50 33 -1.57 -123 0 0 12 38 17 7 19 9.8 6 108 -61 11 41 3 13 36 59 11 19 46 13 59 36 -1.58 -124 0 0 12 48 33 7 19 5.6 5 108 -60 11 51 12 13 47 22 11 29 52 14 10 2 -1.59 -125 0 0 13 0 9 7 19 2.2 4 108 -60 12 2 39 13 59 8 11 41 16 14 21 51 -1.62 -126 0 0 13 13 5 7 18 59.5 3 107 -59 12 15 26 14 12 15 11 53 59 14 35 3 -1.66 -127 0 0 13 27 23 7 18 57.6 2 107 -58 12 29 31 14 26 46 12 7 59 14 49 39 -1.75 -128 0 0 13 43 0 7 18 56.4 1 107 -58 12 44 54 14 42 38 12 23 18 15 5 37 -2.03 -129 0 0 13 59 59 7 18 56.1 0 107 -57 13 1 37 .. .. .. 12 39 55 .. .. .. -15.51 Uncertainty in time = +/- 6 secs Prediction of 2023 Apr 15.7 Data for the target star ------------------------ * name: UCAC4 369-143101 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 40 59.1968 DE: -16 17 17.594 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 40 59.1968 DE: -16 17 17.594 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 13.6 * B mag [mag]: 14.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (34) Circe asteroid class: approx. diameter [km]: 119 approx. diameter ["]: 0.076 distance from Earth [AU]: 2.15050 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#102 date of fit: 2023 Feb 09 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): 0.019", 0.011", 87.3° remarks: * orbital elements for (34)Circe : Mean anomaly = 94.1874942313 deg Arg. of pericenter = 330.0237308552 deg Long. of node = 184.3314540556 deg Inclination = 5.4973927905 deg Eccentricity = 0.1066063045 Semimajor axis = 2.6867582983 AU Perihelion dist = 2.4003329252 AU Mag: H = 8.69, G = 0.15 Epoch of elements : MJD 60060.31355745 TDT (2023 Apr 26.3136) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1022023Feb09,25.27,2023,4,26,7.525399,-0.552941,0.620375,1.976487,1.762216,-0.005061,-0.000670,0.000001,0.000000 -46.3459,-16.2675,66.59,13.46,False UCAC4 369-143101,18.68311021,-16.2882206,14.64,13.60,13.04,0.0,0,,18.70548610,-16.2674949,0.71,0.77,0,0,0 34,Circe,13.52,118.6,2.1505,0,0,0.561,7.21,,5.8,0 0,94.1173,2023,4,26,330.0237,184.3315,5.4974,0.10661,2.68676,2.40033,8.69,5.0,0.15 1.189,0.0187,0.0107,87,0.0144,Known errors,0.97,-1,-1,-1 20230426_143101,60049.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 15, 17:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org