IOTA/IOTA-ES occultation update for (16133) 1999 XC100 / G171733.3-224529 event on 2024 Jul 08, 19:28 UT Visible from Summary ------- On 2024 Jul 08 UT, the 21.3977800945574 km diameter asteroid (16133) 1999 XC100 will occult a 11.3 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.13 mag to 17.41 mag (the magnitude of the asteroid) for at most 4.020 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: 94 * date and approx. time of event: 2024 Jul 08, 19:18 - 2024 Jul 08, 19:38 * geocentric midpoint of event [JD]: 2460500.31134162 * magnitude of target star: 11.28 * magnitude drop [mag]: 6.13 * estimated maximum duration [s]: 4.020 * Moon: 8 % sunlit, 121° distance * Sun: 153° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 43 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.002", 103°) * approx speed of asteroid's shadow [km/s]: 9.7216 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G171733.3-224529 by 16133 1999 XC100 on 2024 Jul 8 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 - 68 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -33 26 58 ... .. .. ... .. .. .... - 67 0 0 -33 28 25 19 38 17.1 1 117 19 -33 15 27 -33 41 25 -33 3 46 -33 53 9 - 33 27 11 - 33 29 39 .... - 66 0 0 -33 54 20 19 38 16.9 2 116 18 -33 41 23 -34 7 19 -33 29 43 -34 19 2 - 33 53 6 - 33 55 34 0.41 - 65 0 0 -34 19 57 19 38 16.4 3 116 17 -34 7 1 -34 32 55 -33 55 22 -34 44 37 - 34 18 43 - 34 21 11 0.42 - 64 0 0 -34 45 16 19 38 15.7 4 115 16 -34 32 21 -34 58 12 -34 20 43 -35 9 54 - 34 44 2 - 34 46 30 0.42 - 63 0 0 -35 10 16 19 38 14.9 4 115 15 -34 57 22 -35 23 11 -34 45 46 -35 34 52 - 35 9 2 - 35 11 30 0.42 - 62 0 0 -35 34 57 19 38 13.9 5 114 15 -35 22 5 -35 47 52 -35 10 29 -35 59 31 - 35 33 44 - 35 36 11 0.43 - 61 0 0 -35 59 19 19 38 12.7 6 114 14 -35 46 28 -36 12 12 -35 34 54 -36 23 50 - 35 58 6 - 36 0 33 0.43 - 60 0 0 -36 23 22 19 38 11.4 7 113 13 -36 10 32 -36 36 14 -35 58 58 -36 47 50 - 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19 41 11 - 19 43 39 0.45 121 0 0 -19 13 52 19 18 56.7 18 251 -44 -19 0 59 -19 26 47 -18 49 23 -19 38 27 - 19 12 39 - 19 15 6 0.45 122 0 0 -18 45 24 19 18 52.8 17 251 -43 -18 32 32 -18 58 18 -18 20 56 -19 9 57 - 18 44 11 - 18 46 38 0.45 123 0 0 -18 17 1 19 18 49.1 16 251 -42 -18 4 9 -18 29 54 -17 52 35 -18 41 32 - 18 15 48 - 18 18 15 0.45 124 0 0 -17 48 44 19 18 45.6 15 250 -41 -17 35 53 -18 1 36 -17 24 20 -18 13 14 - 17 47 31 - 17 49 58 0.46 125 0 0 -17 20 34 19 18 42.4 14 250 -40 -17 7 44 -17 33 25 -16 56 12 -17 45 1 - 17 19 21 - 17 21 47 0.46 126 0 0 -16 52 31 19 18 39.4 13 250 -39 -16 39 43 -17 5 21 -16 28 11 -17 16 57 - 16 51 18 - 16 53 45 0.46 127 0 0 -16 24 37 19 18 36.6 11 249 -38 -16 11 49 -16 37 26 -16 0 19 -16 49 0 - 16 23 24 - 16 25 50 0.46 128 0 0 -15 56 52 19 18 34.1 10 249 -37 -15 44 5 -16 9 40 -15 32 36 -16 21 13 - 15 55 39 - 15 58 5 0.47 129 0 0 -15 29 17 19 18 31.8 9 249 -36 -15 16 31 -15 42 3 -15 5 3 -15 53 36 - 15 28 4 - 15 30 30 0.47 130 0 0 -15 1 52 19 18 29.7 8 249 -35 -14 49 8 -15 14 37 -14 37 40 -15 26 9 - 15 0 39 - 15 3 5 0.48 131 0 0 -14 34 39 19 18 27.9 7 248 -34 -14 21 56 -14 47 23 -14 10 29 -14 58 53 - 14 33 26 - 14 35 51 0.48 132 0 0 -14 7 37 19 18 26.3 6 248 -32 -13 54 56 -14 20 20 -13 43 30 -14 31 49 - 14 6 25 - 14 8 50 0.49 133 0 0 -13 40 49 19 18 25.0 5 248 -31 -13 28 9 -13 53 30 -13 16 44 -14 4 58 - 13 39 36 - 13 42 1 0.51 134 0 0 -13 14 14 19 18 23.9 4 248 -30 -13 1 35 -13 26 54 -12 50 12 -13 38 21 - 13 13 2 - 13 15 26 0.52 135 0 0 -12 47 53 19 18 23.1 3 247 -29 -12 35 16 -13 0 32 -12 23 54 -13 11 58 - 12 46 41 - 12 49 6 0.56 136 0 0 -12 21 48 19 18 22.5 2 247 -28 -12 9 11 -12 34 25 -11 57 51 -12 45 49 - 12 20 35 - 12 23 0 0.63 137 0 0 -11 55 57 19 18 22.1 1 247 -27 -11 43 23 -12 8 34 -11 32 3 -12 19 56 - 11 54 45 - 11 57 9 0.86 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: G171733.3-224529 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 17 33.3271 DE: -22 45 29.266 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 17 33.3271 DE: -22 45 29.266 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.800,0.600) * V mag [mag]: 11.3 * B mag [mag]: 15.2 * Diameter [mas]: 11.60 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (16133) 1999 XC100 asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.014 distance from Earth [AU]: 2.10150 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2023 Apr 25 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): 0.027", 0.002", 102.953° remarks: * orbital elements for (16133)1999 XC100 : Mean anomaly = 3.1937674670 deg Arg. of pericenter = 175.2089860655 deg Long. of node = 90.2663713326 deg Inclination = 8.6765998693 deg Eccentricity = 0.0188172999 Semimajor axis = 3.1033418930 AU Perihelion dist = 3.0449453778 AU Mag: H = 12.79, G = 0.15 Epoch of elements : MJD 60499.81134183 TDT (2024 Jul 08.8113) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,4.02,2024,7,8,19.472199,0.084186,-0.402703,-5.370954,-1.123141,0.002527,-0.000209,0.000001,0.000000 40.4418,-22.7855,-110.77,22.34,False G171733.3-224529,17.29259087,-22.7581295,15.16,11.28,9.18,11.6,4,,17.31759649,-22.7854506,6.13,7.78,0,0,0 16133,1999 XC100,17.41,39.078,2.1015,0,0,-1.624,-4.70,,1.8,0 0,3.0475,2024,7,8,175.2090,90.2664,8.6766,0.01882,3.10334,3.04495,12.79,5.0,0.15 1.451,0.0273,0.0017,103,0.0116,Known errors,0.97,0,-1,-1 20240708_224529,60140.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org