IOTA/IOTA-ES occultation update for (10281) Libourel / UCAC4 639-021497 event on 2024 Dec 07, 11:22 UT Visible from Summary ------- On 2024 Dec 07 UT, the 12.173606420211 km diameter asteroid (10281) Libourel will occult a 11.2 mag star in the constellation Auriga for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.49 mag to 17.73 mag (the magnitude of the asteroid) for at most 0.950 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: 93 * date and approx. time of event: 2024 Dec 07, 11:16 - 2024 Dec 07, 11:28 * geocentric midpoint of event [JD]: 2460651.97404216 * magnitude of target star: 11.24 * magnitude drop [mag]: 6.49 * estimated maximum duration [s]: 0.950 * Moon: 38 % sunlit, 107° distance * Sun: 165° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 81°) * approx speed of asteroid's shadow [km/s]: 12.9569 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 639-021497 by 10281 Libourel on 2024 Dec 7 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 132 0 0 -34 56 28 11 28 2.9 1 41 -13 -34 48 49 -35 4 8 -34 41 41 -35 11 21 .... 133 0 0 -34 1 56 11 28 2.5 2 40 -14 -33 54 25 -34 9 29 -33 47 24 -34 16 35 0.71 134 0 0 -33 8 29 11 28 1.8 3 40 -16 -33 1 5 -33 15 54 -32 54 10 -33 22 53 0.87 135 0 0 -32 16 6 11 28 0.7 5 39 -17 -32 8 48 -32 23 24 -32 2 0 -32 30 17 0.95 136 0 0 -31 24 48 11 27 59.3 6 39 -18 -31 17 37 -31 32 0 -31 10 55 -31 38 46 0.99 137 0 0 -30 34 36 11 27 57.6 7 38 -19 -30 27 32 -30 41 41 -30 20 56 -30 48 21 1.02 138 0 0 -29 45 30 11 27 55.6 8 38 -20 -29 38 32 -29 52 29 -29 32 1 -29 59 3 1.04 139 0 0 -28 57 30 11 27 53.3 9 37 -21 -28 50 38 -29 4 23 -28 44 13 -29 10 51 1.06 140 0 0 -28 10 36 11 27 50.7 11 37 -23 -28 3 50 -28 17 24 -27 57 30 -28 23 47 1.07 141 0 0 -27 24 49 11 27 47.8 12 36 -24 -27 18 8 -27 31 31 -27 11 54 -27 37 49 1.08 142 0 0 -26 40 9 11 27 44.7 13 36 -25 -26 33 33 -26 46 46 -26 27 23 -26 52 58 1.09 143 0 0 -25 56 35 11 27 41.3 14 35 -26 -25 50 4 -26 3 6 -25 43 59 -26 9 14 1.09 144 0 0 -25 14 7 11 27 37.7 15 35 -27 -25 7 41 -25 20 34 -25 1 40 -25 26 37 1.10 145 0 0 -24 32 45 11 27 33.8 16 34 -28 -24 26 24 -24 39 7 -24 20 27 -24 45 6 1.10 146 0 0 -23 52 29 11 27 29.7 17 34 -29 -23 46 12 -23 58 47 -23 40 20 -24 4 41 1.11 147 0 0 -23 13 18 11 27 25.3 18 33 -31 -23 7 6 -23 19 32 -23 1 18 -23 25 23 1.11 148 0 0 -22 35 13 11 27 20.8 19 33 -32 -22 29 5 -22 41 23 -22 23 21 -22 47 10 1.11 149 0 0 -21 58 13 11 27 16.0 20 32 -33 -21 52 9 -22 4 19 -21 46 28 -22 10 2 1.11 150 0 0 -21 22 18 11 27 11.1 21 31 -34 -21 16 17 -21 28 20 -21 10 40 -21 33 59 1.12 151 0 0 -20 47 27 11 27 5.9 22 31 -35 -20 41 29 -20 53 25 -20 35 56 -20 59 1 1.12 152 0 0 -20 13 39 11 27 0.6 23 30 -36 -20 7 45 -20 19 34 -20 2 15 -20 25 7 1.12 153 0 0 -19 40 55 11 26 55.1 24 30 -37 -19 35 5 -19 46 47 -19 29 37 -19 52 17 1.12 154 0 0 -19 9 15 11 26 49.4 25 29 -38 -19 3 27 -19 15 3 -18 58 2 -19 20 30 1.12 155 0 0 -18 38 36 11 26 43.6 26 29 -39 -18 32 52 -18 44 21 -18 27 30 -18 49 45 1.12 156 0 0 -18 9 0 11 26 37.6 27 28 -40 -18 3 18 -18 14 42 -17 57 59 -18 20 3 1.12 157 0 0 -17 40 25 11 26 31.5 28 27 -41 -17 34 46 -17 46 5 -17 29 30 -17 51 23 1.12 158 0 0 -17 12 52 11 26 25.2 28 27 -42 -17 7 16 -17 18 29 -17 2 1 -17 23 45 1.12 159 0 0 -16 46 19 11 26 18.8 29 26 -42 -16 40 45 -16 51 54 -16 35 34 -16 57 7 1.12 160 0 0 -16 20 47 11 26 12.2 30 26 -43 -16 15 16 -16 26 19 -16 10 6 -16 31 30 1.12 161 0 0 -15 56 15 11 26 5.6 31 25 -44 -15 50 46 -16 1 44 -15 45 38 -16 6 54 1.12 162 0 0 -15 32 42 11 25 58.8 31 24 -45 -15 27 15 -15 38 9 -15 22 10 -15 43 17 1.12 163 0 0 -15 10 8 11 25 51.9 32 24 -46 -15 4 43 -15 15 34 -14 59 40 -15 20 39 1.13 164 0 0 -14 48 33 11 25 45.0 33 23 -47 -14 43 11 -14 53 57 -14 38 9 -14 59 0 1.13 165 0 0 -14 27 57 11 25 37.9 34 22 -47 -14 22 36 -14 33 18 -14 17 36 -14 38 20 1.13 166 0 0 -14 8 18 11 25 30.7 34 21 -48 -14 2 59 -14 13 38 -13 58 1 -14 18 38 1.13 167 0 0 -13 49 37 11 25 23.4 35 21 -49 -13 44 20 -13 54 55 -13 39 23 -13 59 54 1.13 168 0 0 -13 31 53 11 25 16.1 35 20 -50 -13 26 37 -13 37 9 -13 21 42 -13 42 6 1.13 169 0 0 -13 15 6 11 25 8.6 36 19 -50 -13 9 51 -13 20 21 -13 4 57 -13 25 16 1.13 170 0 0 -12 59 15 11 25 1.1 37 18 -51 -12 54 2 -13 4 29 -12 49 9 -13 9 23 1.13 171 0 0 -12 44 21 11 24 53.6 37 17 -51 -12 39 9 -12 49 33 -12 34 18 -12 54 26 1.13 172 0 0 -12 30 22 11 24 45.9 38 17 -52 -12 25 12 -12 35 34 -12 20 21 -12 40 25 1.13 173 0 0 -12 17 20 11 24 38.2 38 16 -53 -12 12 10 -12 22 30 -12 7 21 -12 27 21 1.13 174 0 0 -12 5 12 11 24 30.5 38 15 -53 -12 0 4 -12 10 21 -11 55 15 -12 15 11 1.13 175 0 0 -11 54 0 11 24 22.7 39 14 -54 -11 48 52 -11 59 8 -11 44 5 -12 3 57 1.13 176 0 0 -11 43 42 11 24 14.8 39 13 -54 -11 38 36 -11 48 49 -11 33 49 -11 53 38 1.13 177 0 0 -11 34 20 11 24 6.9 40 12 -54 -11 29 14 -11 39 26 -11 24 28 -11 44 13 1.13 178 0 0 -11 25 51 11 23 59.0 40 11 -55 -11 20 46 -11 30 57 -11 16 1 -11 35 43 1.13 179 0 0 -11 18 17 11 23 51.0 40 10 -55 -11 13 12 -11 23 22 -11 8 28 -11 28 8 1.13 -180 0 0 -11 11 37 11 23 43.0 41 9 -55 -11 6 33 -11 16 41 -11 1 49 -11 21 27 1.13 -179 0 0 -11 5 51 11 23 35.0 41 8 -56 -11 0 47 -11 10 55 -10 56 4 -11 15 40 1.13 -178 0 0 -11 0 58 11 23 26.9 41 7 -56 -10 55 55 -11 6 2 -10 51 12 -11 10 47 1.13 -177 0 0 -10 57 0 11 23 18.8 41 6 -56 -10 51 57 -11 2 3 -10 47 14 -11 6 47 1.13 -176 0 0 -10 53 55 11 23 10.7 41 5 -56 -10 48 53 -10 58 58 -10 44 10 -11 3 42 1.13 -175 0 0 -10 51 44 11 23 2.6 41 4 -56 -10 46 41 -10 56 46 -10 41 59 -11 1 30 1.13 -174 0 0 -10 50 26 11 22 54.4 41 3 -57 -10 45 24 -10 55 28 -10 40 41 -11 0 12 1.13 -173 0 0 -10 50 1 11 22 46.3 42 2 -57 -10 44 59 -10 55 4 -10 40 17 -10 59 48 1.13 -172 0 0 -10 50 30 11 22 38.1 42 1 -57 -10 45 28 -10 55 33 -10 40 46 -11 0 17 1.13 -171 0 0 -10 51 53 11 22 30.0 42 0 -56 -10 46 51 -10 56 56 -10 42 8 -11 1 40 1.13 -170 0 0 -10 54 9 11 22 21.8 42 359 -56 -10 49 7 -10 59 12 -10 44 24 -11 3 56 1.13 -169 0 0 -10 57 19 11 22 13.7 41 358 -56 -10 52 16 -11 2 22 -10 47 33 -11 7 6 1.13 -168 0 0 -11 1 22 11 22 5.5 41 357 -56 -10 56 19 -11 6 25 -10 51 36 -11 11 10 1.13 -167 0 0 -11 6 19 11 21 57.4 41 356 -56 -11 1 15 -11 11 23 -10 56 32 -11 16 8 1.13 -166 0 0 -11 12 9 11 21 49.3 41 355 -56 -11 7 5 -11 17 14 -11 2 21 -11 21 59 1.13 -165 0 0 -11 18 54 11 21 41.2 41 354 -55 -11 13 50 -11 23 59 -11 9 5 -11 28 45 1.13 -164 0 0 -11 26 33 11 21 33.1 41 353 -55 -11 21 28 -11 31 38 -11 16 42 -11 36 25 1.13 -163 0 0 -11 35 5 11 21 25.1 40 352 -55 -11 30 0 -11 40 12 -11 25 14 -11 44 59 1.13 -162 0 0 -11 44 33 11 21 17.1 40 351 -54 -11 39 26 -11 49 40 -11 34 39 -11 54 28 1.13 -161 0 0 -11 54 55 11 21 9.1 40 350 -54 -11 49 47 -12 0 3 -11 45 0 -12 4 51 1.13 -160 0 0 -12 6 11 11 21 1.1 39 349 -53 -12 1 3 -12 11 20 -11 56 14 -12 16 10 1.13 -159 0 0 -12 18 23 11 20 53.2 39 348 -53 -12 13 13 -12 23 33 -12 8 24 -12 28 24 1.14 -158 0 0 -12 31 30 11 20 45.4 39 347 -52 -12 26 19 -12 36 41 -12 21 29 -12 41 33 1.14 -157 0 0 -12 45 32 11 20 37.6 38 346 -52 -12 40 20 -12 50 44 -12 35 29 -12 55 37 1.14 -156 0 0 -13 0 30 11 20 29.8 38 346 -51 -12 55 17 -13 5 44 -12 50 24 -13 10 38 1.14 -155 0 0 -13 16 24 11 20 22.1 37 345 -50 -13 11 10 -13 21 39 -13 6 16 -13 26 35 1.14 -154 0 0 -13 33 15 11 20 14.5 37 344 -50 -13 27 59 -13 38 32 -13 23 4 -13 43 28 1.14 -153 0 0 -13 51 2 11 20 6.9 36 343 -49 -13 45 45 -13 56 20 -13 40 48 -14 1 19 1.14 -152 0 0 -14 9 47 11 19 59.4 35 342 -48 -14 4 28 -14 15 7 -13 59 29 -14 20 6 1.14 -151 0 0 -14 29 28 11 19 52.0 35 341 -48 -14 24 8 -14 34 50 -14 19 8 -14 39 52 1.14 -150 0 0 -14 50 8 11 19 44.7 34 341 -47 -14 44 45 -14 55 31 -14 39 44 -15 0 35 1.14 -149 0 0 -15 11 46 11 19 37.4 34 340 -46 -15 6 21 -15 17 11 -15 1 17 -15 22 16 1.15 -148 0 0 -15 34 22 11 19 30.3 33 339 -45 -15 28 55 -15 39 49 -15 23 50 -15 44 57 1.15 -147 0 0 -15 57 57 11 19 23.2 32 338 -44 -15 52 28 -16 3 27 -15 47 21 -16 8 36 1.15 -146 0 0 -16 22 31 11 19 16.2 32 338 -44 -16 17 0 -16 28 3 -16 11 51 -16 33 15 1.15 -145 0 0 -16 48 6 11 19 9.4 31 337 -43 -16 42 32 -16 53 40 -16 37 20 -16 58 54 1.15 -144 0 0 -17 14 40 11 19 2.7 30 336 -42 -17 9 4 -17 20 17 -17 3 50 -17 25 33 1.15 -143 0 0 -17 42 15 11 18 56.1 29 336 -41 -17 36 36 -17 47 54 -17 31 20 -17 53 13 1.15 -142 0 0 -18 10 51 11 18 49.6 28 335 -40 -18 5 9 -18 16 33 -17 59 50 -18 21 54 1.15 -141 0 0 -18 40 28 11 18 43.2 28 334 -39 -18 34 44 -18 46 13 -18 29 22 -18 51 37 1.16 -140 0 0 -19 11 7 11 18 37.0 27 334 -38 -19 5 20 -19 16 56 -18 59 55 -19 22 22 1.16 -139 0 0 -19 42 49 11 18 31.0 26 333 -37 -19 36 58 -19 48 40 -19 31 31 -19 54 10 1.16 -138 0 0 -20 15 33 11 18 25.1 25 333 -36 -20 9 39 -20 21 28 -20 4 9 -20 27 0 1.16 -137 0 0 -20 49 20 11 18 19.4 24 332 -35 -20 43 23 -20 55 18 -20 37 49 -21 0 54 1.16 -136 0 0 -21 24 11 11 18 13.8 23 331 -34 -21 18 10 -21 30 13 -21 12 33 -21 35 52 1.16 -135 0 0 -22 0 6 11 18 8.4 22 331 -33 -21 54 1 -22 6 11 -21 48 21 -22 11 54 1.17 -134 0 0 -22 37 5 11 18 3.2 21 330 -32 -22 30 56 -22 43 14 -22 25 12 -22 49 1 1.17 -133 0 0 -23 15 8 11 17 58.2 20 330 -31 -23 8 56 -23 21 22 -23 3 8 -23 27 12 1.17 -132 0 0 -23 54 17 11 17 53.4 19 329 -30 -23 48 0 -24 0 34 -23 42 8 -24 6 29 1.17 -131 0 0 -24 34 30 11 17 48.8 18 329 -29 -24 28 9 -24 40 52 -24 22 13 -24 46 51 1.17 -130 0 0 -25 15 49 11 17 44.5 17 328 -27 -25 9 24 -25 22 16 -25 3 24 -25 28 19 1.18 -129 0 0 -25 58 14 11 17 40.3 16 328 -26 -25 51 44 -26 4 46 -25 45 39 -26 10 53 1.18 -128 0 0 -26 41 45 11 17 36.4 15 327 -25 -26 35 9 -26 48 22 -26 29 0 -26 54 34 1.18 -127 0 0 -27 26 22 11 17 32.8 14 326 -24 -27 19 41 -27 33 4 -27 13 27 -27 39 21 1.19 -126 0 0 -28 12 4 11 17 29.4 13 326 -23 -28 5 18 -28 18 52 -27 58 59 -28 25 14 1.19 -125 0 0 -28 58 53 11 17 26.3 11 325 -22 -28 52 2 -29 5 46 -28 45 37 -29 12 14 1.19 -124 0 0 -29 46 48 11 17 23.4 10 325 -21 -29 39 50 -29 53 47 -29 33 21 -30 0 20 1.20 -123 0 0 -30 35 49 11 17 20.9 9 324 -19 -30 28 45 -30 42 54 -30 22 9 -30 49 33 1.20 -122 0 0 -31 25 55 11 17 18.6 8 324 -18 -31 18 45 -31 33 6 -31 12 3 -31 39 52 1.21 -121 0 0 -32 17 6 11 17 16.6 7 323 -17 -32 9 50 -32 24 25 -32 3 2 -32 31 16 1.22 -120 0 0 -33 9 22 11 17 14.9 6 323 -16 -33 1 59 -33 16 48 -32 55 5 -33 23 46 1.23 -119 0 0 -34 2 43 11 17 13.6 4 322 -15 -33 55 12 -34 10 15 -33 48 11 -34 17 21 1.25 -118 0 0 -34 57 7 11 17 12.6 3 322 -13 -34 49 28 -35 4 47 -34 42 21 -35 11 59 1.29 -117 0 0 -35 52 33 11 17 11.9 2 321 -12 -35 44 47 -36 0 21 -35 37 32 -36 7 41 1.37 -116 0 0 -36 49 1 11 17 11.6 1 320 -11 -36 41 7 -36 56 57 -36 33 44 -37 4 24 1.71 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 639-021497 * constellation : Auriga * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 04 07.0222 DE: +37 37 12.990 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 04 07.0222 DE: +37 37 12.991 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * B mag [mag]: 12.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (10281) Libourel asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.009 distance from Earth [AU]: 1.86680 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#43 date of fit: 2023 Apr 27 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", 0.002", 80.821° remarks: * orbital elements for (10281)Libourel : Mean anomaly = 175.3494028596 deg Arg. of pericenter = 251.0487469681 deg Long. of node = 11.1423507913 deg Inclination = 10.5215871138 deg Eccentricity = 0.0362389306 Semimajor axis = 2.7310500193 AU Perihelion dist = 2.6320796873 AU Mag: H = 13.69, G = 0.15 Epoch of elements : MJD 60651.47404258 TDT (2024 Dec 07.4740) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#432023Apr27,0.95,2024,12,7,11.377012,-0.016618,-0.747960,-7.311457,0.162413,-0.000140,-0.001532,0.000002,0.000000 -170.9214,37.6561,7.26,-22.69,False UCAC4 639-021497,5.06861727,37.6202750,12.15,11.24,10.75,0.1,0,,5.09727067,37.6560786,6.50,6.54,0,0,0 10281,Libourel,17.73,12.309,1.8668,0,0,-2.900,0.76,,1.2,0 0,175.2459,2024,12,7,251.0487,11.1424,10.5216,0.03624,2.73105,2.63208,13.69,5.0,0.15 1.468,0.0203,0.0021,81,0.0042,Known errors,1.13,0,-1,-1 20241207_021497,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org