IOTA/IOTA-ES occultation update for (2387) Xi'an / TYC 7429-00690-1 event on 2024 Oct 26, 09:59 UT Visible from Summary ------- On 2024 Oct 26 UT, the 20.5800893723046 km diameter asteroid (2387) Xi'an will occult a 9.7 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.82 mag to 17.48 mag (the magnitude of the asteroid) for at most 0.920 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: 95 * date and approx. time of event: 2024 Oct 26, 09:55 - 2024 Oct 26, 10:02 * geocentric midpoint of event [JD]: 2460609.91609458 * magnitude of target star: 9.66 * magnitude drop [mag]: 7.82 * estimated maximum duration [s]: 0.920 * Moon: 30 % sunlit, 144° distance * Sun: 77° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 86°) * approx speed of asteroid's shadow [km/s]: 22.5234 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7429-00690-1 by 2387 Xi'an on 2024 Oct 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 ' " Latitude Latitude Latitude Latitude 37 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 25 26 28 .. .. .. .... 38 0 0 25 6 50 9 56 5.5 1 126 51 24 56 20 25 17 22 24 47 18 25 26 31 .... 39 0 0 24 28 28 9 56 5.8 2 127 51 24 18 4 24 38 54 24 9 8 24 47 57 -0.72 40 0 0 23 51 7 9 56 6.1 3 127 51 23 40 50 24 1 26 23 31 58 24 10 24 -0.87 41 0 0 23 14 47 9 56 6.7 4 128 52 23 4 36 23 25 1 22 55 50 23 33 53 -0.94 42 0 0 22 39 28 9 56 7.4 5 128 52 22 29 23 22 49 36 22 20 42 22 58 24 -0.98 43 0 0 22 5 11 9 56 8.2 6 128 52 21 55 11 22 15 14 21 46 35 22 23 56 -1.01 44 0 0 21 31 56 9 56 9.2 8 129 52 21 22 1 21 41 53 21 13 29 21 50 30 -1.03 45 0 0 20 59 41 9 56 10.3 9 129 52 20 49 52 21 9 33 20 41 24 21 18 7 -1.05 46 0 0 20 28 28 9 56 11.6 10 130 52 20 18 43 20 38 15 20 10 20 20 46 44 -1.06 47 0 0 19 58 17 9 56 13.0 11 130 52 19 48 36 20 7 59 19 40 17 20 16 24 -1.07 48 0 0 19 29 6 9 56 14.6 12 130 52 19 19 30 19 38 44 19 11 14 19 47 5 -1.08 49 0 0 19 0 57 9 56 16.3 13 131 52 18 51 25 19 10 30 18 43 13 19 18 48 -1.08 50 0 0 18 33 48 9 56 18.1 14 131 51 18 24 21 18 43 18 18 16 12 18 51 32 -1.09 51 0 0 18 7 41 9 56 20.1 15 132 51 17 58 17 18 17 7 17 50 12 18 25 17 -1.09 52 0 0 17 42 34 9 56 22.1 16 132 51 17 33 14 17 51 56 17 25 12 18 0 3 -1.10 53 0 0 17 18 28 9 56 24.3 17 132 51 17 9 12 17 27 47 17 1 13 17 35 51 -1.10 54 0 0 16 55 23 9 56 26.7 18 133 50 16 46 10 17 4 38 16 38 14 17 12 39 -1.11 55 0 0 16 33 18 9 56 29.1 19 133 50 16 24 8 16 42 30 16 16 15 16 50 28 -1.11 56 0 0 16 12 14 9 56 31.7 20 134 49 16 3 7 16 21 22 15 55 16 16 29 18 -1.11 57 0 0 15 52 9 9 56 34.3 21 134 49 15 43 5 16 1 15 15 35 16 16 9 8 -1.12 58 0 0 15 33 4 9 56 37.1 21 135 48 15 24 3 15 42 7 15 16 17 15 49 58 -1.12 59 0 0 15 15 0 9 56 40.0 22 135 48 15 6 1 15 24 0 14 58 17 15 31 48 -1.12 60 0 0 14 57 54 9 56 43.0 23 135 47 14 48 58 15 6 52 14 41 16 15 14 39 -1.12 61 0 0 14 41 49 9 56 46.0 24 136 46 14 32 55 14 50 44 14 25 14 14 58 29 -1.13 62 0 0 14 26 42 9 56 49.2 25 136 46 14 17 50 14 35 36 14 10 12 14 43 18 -1.13 63 0 0 14 12 35 9 56 52.5 26 137 45 14 3 45 14 21 26 13 56 8 14 29 7 -1.13 64 0 0 13 59 27 9 56 55.9 27 138 45 13 50 38 14 8 16 13 43 3 14 15 56 -1.13 65 0 0 13 47 17 9 56 59.3 28 138 44 13 38 31 13 56 5 13 30 57 14 3 43 -1.13 66 0 0 13 36 7 9 57 2.9 28 139 43 13 27 22 13 44 53 13 19 49 13 52 30 -1.13 67 0 0 13 25 55 9 57 6.5 29 139 42 13 17 11 13 34 40 13 9 40 13 42 15 -1.14 68 0 0 13 16 42 9 57 10.2 30 140 42 13 7 59 13 25 26 13 0 29 13 33 0 -1.14 69 0 0 13 8 27 9 57 14.0 31 140 41 12 59 46 13 17 10 12 52 16 13 24 43 -1.14 70 0 0 13 1 11 9 57 17.9 31 141 40 12 52 30 13 9 53 12 45 2 13 17 25 -1.14 71 0 0 12 54 53 9 57 21.8 32 142 39 12 46 13 13 3 34 12 38 45 13 11 5 -1.14 72 0 0 12 49 33 9 57 25.8 33 142 38 12 40 54 12 58 13 12 33 27 13 5 45 -1.14 73 0 0 12 45 12 9 57 29.9 33 143 37 12 36 33 12 53 52 12 29 6 13 1 22 -1.14 74 0 0 12 41 49 9 57 34.1 34 144 37 12 33 11 12 50 28 12 25 44 12 57 58 -1.14 75 0 0 12 39 24 9 57 38.3 35 145 36 12 30 46 12 48 3 12 23 20 12 55 33 -1.15 76 0 0 12 37 57 9 57 42.6 35 145 35 12 29 20 12 46 36 12 21 53 12 54 6 -1.15 77 0 0 12 37 29 9 57 47.0 36 146 34 12 28 51 12 46 8 12 21 25 12 53 38 -1.15 78 0 0 12 37 59 9 57 51.4 36 147 33 12 29 21 12 46 38 12 21 55 12 54 8 -1.15 79 0 0 12 39 28 9 57 55.8 37 148 32 12 30 50 12 48 7 12 23 23 12 55 37 -1.15 80 0 0 12 41 55 9 58 0.4 37 149 31 12 33 16 12 50 34 12 25 49 12 58 5 -1.15 81 0 0 12 45 20 9 58 5.0 38 150 30 12 36 41 12 54 0 12 29 14 13 1 31 -1.15 82 0 0 12 49 44 9 58 9.6 38 151 29 12 41 5 12 58 25 12 33 37 13 5 57 -1.15 83 0 0 12 55 7 9 58 14.3 39 152 28 12 46 26 13 3 49 12 38 58 13 11 21 -1.15 84 0 0 13 1 28 9 58 19.0 39 152 27 12 52 47 13 10 11 12 45 18 13 17 44 -1.15 85 0 0 13 8 49 9 58 23.8 39 153 26 13 0 7 13 17 33 12 52 36 13 25 7 -1.15 86 0 0 13 17 9 9 58 28.6 40 155 25 13 8 25 13 25 54 13 0 54 13 33 29 -1.15 87 0 0 13 26 28 9 58 33.4 40 156 24 13 17 43 13 35 14 13 10 10 13 42 51 -1.15 88 0 0 13 36 46 9 58 38.3 40 157 23 13 28 0 13 45 34 13 20 26 13 53 12 -1.15 89 0 0 13 48 4 9 58 43.2 40 158 22 13 39 16 13 56 54 13 31 41 14 4 33 -1.15 90 0 0 14 0 22 9 58 48.2 41 159 21 13 51 32 14 9 14 13 43 55 14 16 55 -1.15 91 0 0 14 13 40 9 58 53.2 41 160 20 14 4 48 14 22 34 13 57 10 14 30 16 -1.15 92 0 0 14 27 59 9 58 58.2 41 161 19 14 19 5 14 36 54 14 11 24 14 44 39 -1.16 93 0 0 14 43 18 9 59 3.2 41 162 18 14 34 21 14 52 16 14 26 39 15 0 2 -1.16 94 0 0 14 59 37 9 59 8.3 41 163 17 14 50 38 15 8 38 14 42 54 15 16 26 -1.16 95 0 0 15 16 58 9 59 13.3 41 164 16 15 7 56 15 26 1 15 0 10 15 33 51 -1.16 96 0 0 15 35 19 9 59 18.4 41 166 15 15 26 15 15 44 25 15 18 27 15 52 18 -1.16 97 0 0 15 54 43 9 59 23.5 41 167 14 15 45 36 16 3 51 15 37 45 16 11 47 -1.16 98 0 0 16 15 8 9 59 28.7 41 168 13 16 5 58 16 24 20 15 58 4 16 32 18 -1.16 99 0 0 16 36 35 9 59 33.8 40 169 12 16 27 22 16 45 50 16 19 25 16 53 51 -1.16 100 0 0 16 59 4 9 59 38.9 40 170 11 16 49 47 17 8 23 16 41 48 17 16 27 -1.16 101 0 0 17 22 36 9 59 44.0 40 171 10 17 13 16 17 31 58 17 5 13 17 40 5 -1.16 102 0 0 17 47 10 9 59 49.1 40 173 9 17 37 46 17 56 36 17 29 40 18 4 47 -1.16 103 0 0 18 12 48 9 59 54.2 39 174 8 18 3 20 18 22 18 17 55 11 18 30 32 -1.16 104 0 0 18 39 28 9 59 59.3 39 175 7 18 29 56 18 49 2 18 21 43 18 57 20 -1.16 105 0 0 19 7 12 10 0 4.4 39 176 6 18 57 36 19 16 51 18 49 19 19 25 13 -1.16 106 0 0 19 36 0 10 0 9.5 38 177 5 19 26 19 19 45 43 19 17 59 19 54 9 -1.16 107 0 0 20 5 51 10 0 14.5 38 178 4 19 56 6 20 15 39 19 47 41 20 24 9 -1.16 108 0 0 20 36 47 10 0 19.5 37 179 3 20 26 56 20 46 40 20 18 27 20 55 14 -1.16 109 0 0 21 8 46 10 0 24.5 37 180 2 20 58 50 21 18 44 20 50 17 21 27 23 -1.16 110 0 0 21 41 50 10 0 29.4 36 182 1 21 31 48 21 51 53 21 23 11 22 0 37 -1.16 111 0 0 22 15 58 10 0 34.3 36 183 0 22 5 51 22 26 7 21 57 8 22 34 55 -1.16 112 0 0 22 51 10 10 0 39.2 35 184 -1 22 40 57 23 1 25 22 32 9 23 10 19 -1.16 113 0 0 23 27 26 10 0 44.0 34 185 -2 23 17 7 23 37 48 23 8 15 23 46 47 -1.16 114 0 0 24 4 47 10 0 48.7 34 186 -4 23 54 22 24 15 15 23 45 24 24 24 19 -1.15 115 0 0 24 43 12 10 0 53.4 33 187 -5 24 32 40 24 53 46 24 23 37 25 2 57 -1.15 116 0 0 25 22 41 10 0 58.0 32 188 -6 25 12 3 25 33 22 25 2 53 25 42 39 -1.15 117 0 0 26 3 14 10 1 2.5 31 189 -7 25 52 28 26 14 3 25 43 13 26 23 25 -1.15 118 0 0 26 44 51 10 1 6.9 31 189 -8 26 33 58 26 55 47 26 24 36 27 5 16 -1.15 119 0 0 27 27 31 10 1 11.3 30 190 -9 27 16 30 27 38 34 27 7 2 27 48 11 -1.16 120 0 0 28 11 14 10 1 15.6 29 191 -10 28 0 5 28 22 25 27 50 30 28 32 9 -1.16 121 0 0 28 55 59 10 1 19.7 28 192 -11 28 44 42 29 7 19 28 35 0 29 17 10 -1.16 122 0 0 29 41 46 10 1 23.8 27 193 -12 29 30 21 29 53 15 29 20 31 30 3 13 -1.16 123 0 0 30 28 35 10 1 27.8 26 194 -13 30 17 1 30 40 13 30 7 4 30 50 19 -1.16 124 0 0 31 16 24 10 1 31.6 25 195 -14 31 4 41 31 28 11 30 54 36 31 38 26 -1.16 125 0 0 32 5 13 10 1 35.3 24 196 -15 31 53 20 32 17 10 31 43 7 32 27 32 -1.16 126 0 0 32 55 0 10 1 38.9 23 196 -15 32 42 58 33 7 7 32 32 36 33 17 39 -1.16 127 0 0 33 45 46 10 1 42.3 22 197 -16 33 33 33 33 58 3 33 23 2 34 8 43 -1.16 128 0 0 34 37 27 10 1 45.6 21 198 -17 34 25 4 34 49 55 34 14 25 35 0 45 -1.16 129 0 0 35 30 4 10 1 48.8 20 199 -18 35 17 30 35 42 43 35 6 41 35 53 43 -1.16 130 0 0 36 23 35 10 1 51.8 19 199 -19 36 10 49 36 36 25 35 59 51 36 47 35 -1.16 131 0 0 37 17 57 10 1 54.6 18 200 -20 37 5 0 37 31 0 36 53 52 37 42 20 -1.16 132 0 0 38 13 10 10 1 57.3 16 201 -21 38 0 1 38 26 25 37 48 42 38 37 56 -1.16 133 0 0 39 9 11 10 1 59.8 15 202 -21 38 55 49 39 22 39 38 44 21 39 34 21 -1.17 134 0 0 40 5 58 10 2 2.1 14 202 -22 39 52 24 40 19 39 39 40 44 40 31 33 -1.17 135 0 0 41 3 30 10 2 4.2 13 203 -23 40 49 42 41 17 24 40 37 51 41 29 30 -1.17 136 0 0 42 1 43 10 2 6.2 12 204 -24 41 47 41 42 15 51 41 35 39 42 28 9 -1.17 137 0 0 43 0 34 10 2 8.0 11 205 -24 42 46 18 43 14 57 42 34 4 43 27 28 -1.18 138 0 0 44 0 2 10 2 9.6 9 205 -25 43 45 32 44 14 39 43 33 5 44 27 23 -1.18 139 0 0 45 0 2 10 2 10.9 8 206 -26 44 45 17 45 14 55 44 32 38 45 27 52 -1.19 140 0 0 46 0 32 10 2 12.1 7 207 -26 45 45 32 46 15 40 45 32 40 46 28 52 -1.20 141 0 0 47 1 28 10 2 13.1 6 208 -27 46 46 12 47 16 52 46 33 8 47 30 18 -1.21 142 0 0 48 2 47 10 2 13.9 4 208 -27 47 47 15 48 18 27 47 33 57 48 32 7 -1.23 143 0 0 49 4 23 10 2 14.5 3 209 -27 48 48 36 49 20 21 48 35 4 49 34 16 -1.27 144 0 0 50 6 15 10 2 14.9 2 210 -28 49 50 10 50 22 29 49 36 24 50 36 39 -1.34 145 0 0 51 8 16 10 2 15.1 1 211 -28 50 51 54 51 24 47 50 37 54 51 39 13 -1.63 146 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 51 39 29 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 7429-00690-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 34 08.7884 DE: -32 09 38.173 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 34 08.7884 DE: -32 09 38.173 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.7 * B mag [mag]: 10.4 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2387) Xi'an asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.28030 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 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): 0.013", 0.002", 86.075° remarks: * orbital elements for (2387)Xi'an : Mean anomaly = 217.3019757587 deg Arg. of pericenter = 42.7811690493 deg Long. of node = 53.0269712835 deg Inclination = 10.9467673654 deg Eccentricity = 0.0755094195 Semimajor axis = 3.0222180894 AU Perihelion dist = 2.7940121557 AU Mag: H = 11.45, G = 0.15 Epoch of elements : MJD 60609.41609425 TDT (2024 Oct 26.4161) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.92,2024,10,26,9.986270,-0.240361,0.716627,12.053909,4.039792,0.005743,0.000714,0.000000,0.000000 108.8678,-32.1087,26.19,-12.68,False TYC 7429-00690-1,19.56910793,-32.1606036,10.44,9.66,9.24,0.1,0,,19.59549975,-32.1086846,7.82,7.79,0,0,0 2387,Xi'an,17.48,20.818,3.2803,0,0,2.543,10.83,,2.0,0 0,217.2239,2024,10,26,42.7812,53.0270,10.9468,0.07551,3.02222,2.79401,11.45,5.0,0.15 1.432,0.0127,0.0021,86,0.0038,Known errors,1.01,0,-1,-1 20241026_0690-1,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org