IOTA/IOTA-ES occultation update for (163693) Atira / TYC 1949-01707-1 event on 2023 Jul 09, 00:46 UT Visible from Summary ------- On 2023 Jul 09 UT, the 1.8 km diameter asteroid (163693) Atira will occult a 11.6 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.09 mag to 18.69 mag (the magnitude of the asteroid) for at most 0.030 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: 17 * date and approx. time of event: 2023 Jul 09, 00:44 - 2023 Jul 09, 00:48 * geocentric midpoint of event [JD]: 2460134.53214370 * magnitude of target star: 11.60 * magnitude drop [mag]: 7.09 * estimated maximum duration [s]: 0.030 * Moon: 61 % sunlit, 123° distance * Sun: 23° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 2 * 1 sigma uncertainty interval [path widths]: +/- 3.92 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.004", 105°) * approx speed of asteroid's shadow [km/s]: 51.1652 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1949-01707-1 by 163693 Atira on 2023 Jul 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 101 0 0 7 58 26 0 44 12.9 0 62 22 7 57 53 7 58 59 7 53 40 8 3 12 .... 102 0 0 8 30 42 0 44 12.9 1 62 23 8 30 9 8 31 15 8 25 56 8 35 28 -0.15 103 0 0 9 2 48 0 44 13.0 2 62 24 9 2 15 9 3 21 8 58 2 9 7 33 -0.10 104 0 0 9 34 41 0 44 13.1 4 62 25 9 34 8 9 35 14 9 29 56 9 39 27 -0.08 105 0 0 10 6 22 0 44 13.3 5 62 27 10 5 49 10 6 55 10 1 37 10 11 7 -0.07 106 0 0 10 37 50 0 44 13.5 6 62 28 10 37 17 10 38 22 10 33 5 10 42 34 -0.06 107 0 0 11 9 3 0 44 13.8 7 63 29 11 8 30 11 9 36 11 4 19 11 13 47 -0.06 108 0 0 11 40 1 0 44 14.1 8 63 30 11 39 28 11 40 34 11 35 17 11 44 45 -0.06 109 0 0 12 10 43 0 44 14.5 9 63 31 12 10 11 12 11 16 12 6 0 12 15 27 -0.05 110 0 0 12 41 9 0 44 14.9 10 63 32 12 40 36 12 41 42 12 36 26 12 45 52 -0.05 111 0 0 13 11 17 0 44 15.3 11 63 33 13 10 45 13 11 50 13 6 35 13 16 0 -0.05 112 0 0 13 41 8 0 44 15.8 12 64 34 13 40 36 13 41 40 13 36 26 13 45 50 -0.05 113 0 0 14 10 40 0 44 16.3 13 64 35 14 10 7 14 11 12 14 5 58 14 15 21 -0.05 114 0 0 14 39 53 0 44 16.9 15 64 36 14 39 20 14 40 25 14 35 12 14 44 34 -0.05 115 0 0 15 8 45 0 44 17.5 16 64 37 15 8 13 15 9 18 15 4 5 15 13 26 -0.05 116 0 0 15 37 18 0 44 18.2 17 65 39 15 36 45 15 37 50 15 32 38 15 41 58 -0.05 117 0 0 16 5 29 0 44 18.9 18 65 40 16 4 57 16 6 1 16 0 50 16 10 8 -0.05 118 0 0 16 33 19 0 44 19.6 19 65 41 16 32 47 16 33 51 16 28 40 16 37 58 -0.05 119 0 0 17 0 46 0 44 20.4 20 66 42 17 0 14 17 1 19 16 56 8 17 5 25 -0.05 120 0 0 17 27 52 0 44 21.2 21 66 43 17 27 20 17 28 24 17 23 14 17 32 29 -0.05 121 0 0 17 54 34 0 44 22.0 22 66 44 17 54 2 17 55 6 17 49 57 17 59 11 -0.04 122 0 0 18 20 53 0 44 22.9 23 66 45 18 20 21 18 21 25 18 16 16 18 25 29 -0.04 123 0 0 18 46 48 0 44 23.8 24 67 46 18 46 16 18 47 19 18 42 12 18 51 23 -0.04 124 0 0 19 12 18 0 44 24.8 25 67 47 19 11 47 19 12 50 19 7 43 19 16 54 -0.04 125 0 0 19 37 25 0 44 25.7 26 67 48 19 36 53 19 37 56 19 32 50 19 41 59 -0.04 126 0 0 20 2 6 0 44 26.7 27 68 49 20 1 34 20 2 37 19 57 32 20 6 40 -0.04 127 0 0 20 26 22 0 44 27.8 28 68 50 20 25 51 20 26 54 20 21 49 20 30 55 -0.04 128 0 0 20 50 13 0 44 28.9 29 69 51 20 49 41 20 50 44 20 45 40 20 54 45 -0.04 129 0 0 21 13 38 0 44 30.0 30 69 52 21 13 6 21 14 9 21 9 6 21 18 10 -0.04 130 0 0 21 36 36 0 44 31.1 31 69 53 21 36 5 21 37 8 21 32 5 21 41 8 -0.04 131 0 0 21 59 9 0 44 32.2 32 70 54 21 58 38 21 59 40 21 54 38 22 3 40 -0.04 132 0 0 22 21 15 0 44 33.4 33 70 55 22 20 44 22 21 46 22 16 45 22 25 45 -0.04 133 0 0 22 42 55 0 44 34.6 34 70 56 22 42 24 22 43 26 22 38 26 22 47 24 -0.04 134 0 0 23 4 8 0 44 35.9 35 71 57 23 3 37 23 4 39 22 59 39 23 8 37 -0.04 135 0 0 23 24 54 0 44 37.1 36 71 58 23 24 23 23 25 25 23 20 26 23 29 22 -0.04 136 0 0 23 45 13 0 44 38.4 37 72 59 23 44 42 23 45 44 23 40 45 23 49 40 -0.04 137 0 0 24 5 5 0 44 39.7 38 72 60 24 4 34 24 5 35 24 0 38 24 9 31 -0.04 138 0 0 24 24 29 0 44 41.0 39 73 60 24 23 58 24 25 0 24 20 3 24 28 55 -0.04 139 0 0 24 43 26 0 44 42.4 40 73 61 24 42 56 24 43 57 24 39 1 24 47 52 -0.04 140 0 0 25 1 56 0 44 43.7 41 73 62 25 1 26 25 2 27 24 57 31 25 6 21 -0.04 141 0 0 25 19 58 0 44 45.1 42 74 63 25 19 28 25 20 29 25 15 34 25 24 23 -0.04 142 0 0 25 37 33 0 44 46.5 43 74 64 25 37 3 25 38 3 25 33 9 25 41 57 -0.04 143 0 0 25 54 40 0 44 48.0 44 75 65 25 54 10 25 55 10 25 50 17 25 59 3 -0.04 144 0 0 26 11 20 0 44 49.4 45 75 66 26 10 49 26 11 50 26 6 57 26 15 42 -0.04 145 0 0 26 27 32 0 44 50.9 46 76 67 26 27 1 26 28 2 26 23 10 26 31 54 -0.04 146 0 0 26 43 16 0 44 52.3 47 76 68 26 42 46 26 43 46 26 38 54 26 47 37 -0.04 147 0 0 26 58 33 0 44 53.8 48 77 68 26 58 3 26 59 3 26 54 12 27 2 54 -0.04 148 0 0 27 13 22 0 44 55.4 49 77 69 27 12 52 27 13 52 27 9 1 27 17 42 -0.04 149 0 0 27 27 43 0 44 56.9 50 78 70 27 27 13 27 28 13 27 23 23 27 32 3 -0.04 150 0 0 27 41 37 0 44 58.4 50 78 71 27 41 7 27 42 7 27 37 18 27 45 56 -0.04 151 0 0 27 55 3 0 45 0.0 51 79 72 27 54 34 27 55 33 27 50 45 27 59 22 -0.04 152 0 0 28 8 2 0 45 1.5 52 79 73 28 7 32 28 8 32 28 3 44 28 12 20 -0.04 153 0 0 28 20 33 0 45 3.1 53 80 73 28 20 4 28 21 3 28 16 16 28 24 51 -0.04 154 0 0 28 32 37 0 45 4.7 54 80 74 28 32 8 28 33 7 28 28 20 28 36 55 -0.04 155 0 0 28 44 14 0 45 6.3 55 81 75 28 43 44 28 44 43 28 39 57 28 48 31 -0.04 156 0 0 28 55 23 0 45 7.9 56 81 76 28 54 53 28 55 52 28 51 6 28 59 39 -0.04 157 0 0 29 6 4 0 45 9.6 57 82 76 29 5 35 29 6 34 29 1 48 29 10 20 -0.04 158 0 0 29 16 19 0 45 11.2 58 83 77 29 15 49 29 16 48 29 12 3 29 20 34 -0.04 159 0 0 29 26 6 0 45 12.9 59 83 78 29 25 36 29 26 35 29 21 51 29 30 21 -0.04 160 0 0 29 35 26 0 45 14.5 60 84 78 29 34 56 29 35 55 29 31 11 29 39 41 -0.04 161 0 0 29 44 19 0 45 16.2 60 84 79 29 43 49 29 44 48 29 40 4 29 48 33 -0.04 162 0 0 29 52 44 0 45 17.9 61 85 80 29 52 15 29 53 14 29 48 30 29 56 59 -0.04 163 0 0 30 0 43 0 45 19.6 62 86 80 30 0 14 30 1 12 29 56 29 30 4 57 -0.04 164 0 0 30 8 15 0 45 21.3 63 86 80 30 7 46 30 8 44 30 4 1 30 12 28 -0.04 165 0 0 30 15 19 0 45 23.0 64 87 81 30 14 50 30 15 49 30 11 6 30 19 33 -0.04 166 0 0 30 21 57 0 45 24.7 65 87 81 30 21 28 30 22 26 30 17 44 30 26 10 -0.04 167 0 0 30 28 8 0 45 26.5 66 88 81 30 27 39 30 28 37 30 23 56 30 32 21 -0.04 168 0 0 30 33 52 0 45 28.2 66 89 81 30 33 23 30 34 22 30 29 40 30 38 5 -0.04 169 0 0 30 39 10 0 45 30.0 67 89 82 30 38 41 30 39 39 30 34 58 30 43 22 -0.04 170 0 0 30 44 1 0 45 31.7 68 90 82 30 43 32 30 44 30 30 39 48 30 48 13 -0.04 171 0 0 30 48 24 0 45 33.5 69 91 81 30 47 55 30 48 54 30 44 13 30 52 36 -0.04 172 0 0 30 52 22 0 45 35.3 70 92 81 30 51 53 30 52 51 30 48 10 30 56 34 -0.04 173 0 0 30 55 52 0 45 37.0 71 92 81 30 55 23 30 56 21 30 51 41 31 0 4 -0.04 174 0 0 30 58 56 0 45 38.8 72 93 81 30 58 28 30 59 25 30 54 45 31 3 8 -0.04 175 0 0 31 1 34 0 45 40.6 73 94 80 31 1 5 31 2 3 30 57 23 31 5 45 -0.04 176 0 0 31 3 45 0 45 42.4 73 95 80 31 3 16 31 4 14 30 59 34 31 7 56 -0.04 177 0 0 31 5 29 0 45 44.2 74 96 79 31 5 0 31 5 58 31 1 18 31 9 40 -0.04 178 0 0 31 6 47 0 45 46.0 75 97 79 31 6 18 31 7 16 31 2 36 31 10 58 -0.04 179 0 0 31 7 38 0 45 47.9 76 98 78 31 7 9 31 8 7 31 3 27 31 11 49 -0.04 -180 0 0 31 8 3 0 45 49.7 77 99 77 31 7 34 31 8 32 31 3 52 31 12 14 -0.04 -179 0 0 31 8 1 0 45 51.5 78 100 77 31 7 32 31 8 30 31 3 50 31 12 12 -0.04 -178 0 0 31 7 33 0 45 53.4 78 101 76 31 7 4 31 8 2 31 3 21 31 11 44 -0.04 -177 0 0 31 6 38 0 45 55.2 79 103 75 31 6 9 31 7 7 31 2 27 31 10 49 -0.04 -176 0 0 31 5 16 0 45 57.1 80 104 75 31 4 47 31 5 45 31 1 5 31 9 27 -0.04 -175 0 0 31 3 28 0 45 58.9 81 106 74 31 2 59 31 3 57 30 59 17 31 7 40 -0.04 -174 0 0 31 1 14 0 46 0.8 82 108 73 31 0 45 31 1 43 30 57 2 31 5 25 -0.04 -173 0 0 30 58 32 0 46 2.6 82 110 72 30 58 4 30 59 1 30 54 21 31 2 44 -0.04 -172 0 0 30 55 25 0 46 4.5 83 113 72 30 54 56 30 55 54 30 51 13 30 59 36 -0.04 -171 0 0 30 51 50 0 46 6.4 84 116 71 30 51 21 30 52 19 30 47 38 30 56 2 -0.04 -170 0 0 30 47 49 0 46 8.3 85 121 70 30 47 20 30 48 18 30 43 37 30 52 1 -0.04 -169 0 0 30 43 21 0 46 10.2 85 127 69 30 42 52 30 43 50 30 39 9 30 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22 -0.05 -104 0 0 9 56 57 0 48 6.0 29 297 7 9 56 24 9 57 30 9 52 12 10 1 43 -0.05 -103 0 0 9 25 4 0 48 7.2 28 297 6 9 24 31 9 25 37 9 20 19 9 29 50 -0.05 -102 0 0 8 52 59 0 48 8.3 27 297 5 8 52 26 8 53 32 8 48 13 8 57 45 -0.05 -101 0 0 8 20 42 0 48 9.4 26 297 3 8 20 9 8 21 15 8 15 55 8 25 28 -0.05 -100 0 0 7 48 14 0 48 10.5 25 297 2 7 47 41 7 48 47 7 43 27 7 53 0 -0.05 - 99 0 0 7 15 36 0 48 11.5 24 298 1 7 15 3 7 16 9 7 10 49 7 20 23 -0.05 - 98 0 0 6 42 49 0 48 12.5 23 298 0 6 42 16 6 43 22 6 38 2 6 47 36 -0.05 - 97 0 0 6 9 54 0 48 13.4 21 298 -1 6 9 21 6 10 27 6 5 7 6 14 42 -0.05 - 96 0 0 5 36 52 0 48 14.3 20 298 -2 5 36 19 5 37 25 5 32 5 5 41 40 -0.05 - 95 0 0 5 3 44 0 48 15.1 19 298 -3 5 3 11 5 4 17 4 58 57 5 8 32 -0.05 - 94 0 0 4 30 31 0 48 15.9 18 298 -5 4 29 58 4 31 4 4 25 43 4 35 19 -0.05 - 93 0 0 3 57 13 0 48 16.7 17 298 -6 3 56 40 3 57 47 3 52 26 4 2 1 -0.05 - 92 0 0 3 23 53 0 48 17.4 16 298 -7 3 23 20 3 24 26 3 19 5 3 28 40 -0.05 - 91 0 0 2 50 30 0 48 18.0 15 298 -8 2 49 57 2 51 3 2 45 42 2 55 18 -0.05 - 90 0 0 2 17 6 0 48 18.6 13 298 -9 2 16 33 2 17 39 2 12 18 2 21 53 -0.05 - 89 0 0 1 43 41 0 48 19.2 12 298 -10 1 43 8 1 44 14 1 38 54 1 48 29 -0.06 - 88 0 0 1 10 18 0 48 19.7 11 298 -11 1 9 45 1 10 51 1 5 30 1 15 5 -0.06 - 87 0 0 0 36 56 0 48 20.1 10 298 -12 0 36 23 0 37 29 0 32 8 0 41 43 -0.06 - 86 0 0 0 3 37 0 48 20.5 9 298 -14 0 3 4 0 4 10 - 0 1 11 0 8 24 -0.06 - 85 0 0 - 0 29 39 0 48 20.9 8 298 -15 - 0 30 12 - 0 29 5 - 0 34 26 - 0 24 51 -0.06 - 84 0 0 - 1 2 49 0 48 21.2 7 298 -16 - 1 3 22 - 1 2 16 - 1 7 36 - 0 58 2 -0.07 - 83 0 0 - 1 35 54 0 48 21.5 5 298 -17 - 1 36 27 - 1 35 21 - 1 40 41 - 1 31 7 -0.07 - 82 0 0 - 2 8 53 0 48 21.7 4 298 -18 - 2 9 26 - 2 8 19 - 2 13 39 - 2 4 6 -0.08 - 81 0 0 - 2 41 43 0 48 21.8 3 298 -19 - 2 42 16 - 2 41 10 - 2 46 30 - 2 36 57 -0.10 - 80 0 0 - 3 14 26 0 48 21.9 2 298 -20 - 3 14 58 - 3 13 53 - 3 19 12 - 3 9 39 -0.13 - 79 0 0 - 3 46 58 0 48 22.0 1 298 -22 - 3 47 31 - 3 46 25 - 3 51 44 - 3 42 12 -0.25 Uncertainty in time = +/- 1 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: TYC 1949-01707-1 * constellation : Cancer * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 08 49 54.6714 DE: +28 13 17.566 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 08 49 54.6714 DE: +28 13 17.566 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (163693) Atira asteroid class: asteroid system: multiple bodies approx. diameter [km]: 2 approx. diameter ["]: 0.001 distance from Earth [AU]: 1.79160 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#172 date of fit: 2023 Jan 05 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): 0.025", 0.004", 105.368° remarks: * orbital elements for (163693)Atira : Mean anomaly = 139.1641330090 deg Arg. of pericenter = 252.9259000620 deg Long. of node = 103.8797594885 deg Inclination = 25.6189836760 deg Eccentricity = 0.3221517078 Semimajor axis = 0.7409901567 AU Perihelion dist = 0.5022789122 AU Mag: H = 16.39, G = 0.15 Epoch of elements : MJD 60134.03214409 TDT (2023 Jul 09.0321) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1722023Jan05,0.03,2023,7,9,0.771449,0.002482,0.036219,28.674894,-3.427756,-0.000527,-0.000095,-0.000002,0.000000 -165.4566,28.1367,169.72,22.41,False TYC 1949-01707-1,8.83185339,28.2215467,11.94,11.60,11.42,0.0,0,,8.85490384,28.1367334,7.09,6.82,0,0,0 163693,Atira,18.69,1.8,1.7916,0,0,10.640,-16.85,,0.2,0 ,1,6,0.646000,,,,,, 0,137.5693,2023,7,8,252.9259,103.8798,25.6190,0.32215,0.74099,0.50228,16.39,5.0,0.15 4.841,0.0250,0.0040,105,0.0054,Known errors,-1.00,-1,-1,-1 20230709_1707-1,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 04:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org