IOTA/IOTA-ES occultation update for (16133) 1999 XC100 / UCAC4 321-143859 event on 2024 Oct 25, 12:19 UT Visible from Summary ------- On 2024 Oct 25 UT, the 21.2910806332801 km diameter asteroid (16133) 1999 XC100 will occult a 11.5 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 7.29 mag to 18.76 mag (the magnitude of the asteroid) for at most 0.680 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: 99 * date and approx. time of event: 2024 Oct 25, 12:16 - 2024 Oct 25, 12:22 * geocentric midpoint of event [JD]: 2460609.01354771 * magnitude of target star: 11.47 * magnitude drop [mag]: 7.29 * estimated maximum duration [s]: 0.680 * Moon: 39 % sunlit, 138° distance * Sun: 60° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.001", 98°) * approx speed of asteroid's shadow [km/s]: 31.6418 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 321-143859 by 16133 1999 XC100 on 2024 Oct 25 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 - 44 0 0 -19 9 20 12 16 24.3 1 117 55 -19 16 29 -19 2 12 -19 20 7 -18 58 34 .... - 43 0 0 -19 39 9 12 16 24.4 2 117 56 -19 46 18 -19 32 0 -19 49 56 -19 28 22 0.39 - 42 0 0 -20 9 0 12 16 24.6 3 117 57 -20 16 10 -20 1 51 -20 19 48 -19 58 12 0.40 - 41 0 0 -20 38 53 12 16 24.8 4 116 57 -20 46 3 -20 31 44 -20 49 42 -20 28 5 0.41 - 40 0 0 -21 8 48 12 16 25.2 5 116 58 -21 15 58 -21 1 38 -21 19 37 -20 57 59 0.41 - 39 0 0 -21 38 43 12 16 25.6 6 115 59 -21 45 53 -21 31 32 -21 49 33 -21 27 54 0.41 - 38 0 0 -22 8 37 12 16 26.0 7 115 60 -22 15 48 -22 1 26 -22 19 27 -21 57 48 0.41 - 37 0 0 -22 38 30 12 16 26.6 8 115 61 -22 45 41 -22 31 19 -22 49 20 -22 27 40 0.41 - 36 0 0 -23 8 20 12 16 27.2 9 114 61 -23 15 32 -23 1 9 -23 19 11 -22 57 30 0.41 - 35 0 0 -23 38 7 12 16 27.9 10 114 62 -23 45 19 -23 30 56 -23 48 58 -23 27 17 0.41 - 34 0 0 -24 7 51 12 16 28.6 11 113 63 -24 15 2 -24 0 39 -24 18 42 -23 57 0 0.42 - 33 0 0 -24 37 29 12 16 29.4 12 113 63 -24 44 41 -24 30 18 -24 48 20 -24 26 38 0.42 - 32 0 0 -25 7 1 12 16 30.3 13 113 64 -25 14 13 -24 59 50 -25 17 53 -24 56 11 0.42 - 31 0 0 -25 36 28 12 16 31.3 14 112 65 -25 43 39 -25 29 16 -25 47 19 -25 25 37 0.42 - 30 0 0 -26 5 46 12 16 32.3 15 112 65 -26 12 58 -25 58 35 -26 16 38 -25 54 56 0.42 - 29 0 0 -26 34 57 12 16 33.4 17 111 66 -26 42 8 -26 27 46 -26 45 48 -26 24 7 0.42 - 28 0 0 -27 3 58 12 16 34.5 18 111 66 -27 11 10 -26 56 47 -27 14 49 -26 53 8 0.42 - 27 0 0 -27 32 50 12 16 35.7 19 110 67 -27 40 2 -27 25 39 -27 43 41 -27 22 1 0.42 - 26 0 0 -28 1 32 12 16 37.0 20 110 67 -28 8 43 -27 54 21 -28 12 22 -27 50 42 0.42 - 25 0 0 -28 30 2 12 16 38.3 21 109 67 -28 37 13 -28 22 51 -28 40 52 -28 19 13 0.42 - 24 0 0 -28 58 20 12 16 39.7 21 109 68 -29 5 31 -28 51 10 -29 9 10 -28 47 32 0.42 - 23 0 0 -29 26 26 12 16 41.1 22 108 68 -29 33 36 -29 19 16 -29 37 15 -29 15 38 0.42 - 22 0 0 -29 54 18 12 16 42.6 23 107 68 -30 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0 55 -35 18 35 -34 57 20 0.42 - 9 0 0 -35 32 6 12 17 5.7 35 99 67 -35 39 8 -35 25 4 -35 42 43 -35 21 30 0.42 - 8 0 0 -35 55 54 12 17 7.8 36 98 66 -36 2 56 -35 48 53 -36 6 30 -35 45 20 0.42 - 7 0 0 -36 19 22 12 17 9.8 37 97 66 -36 26 23 -36 12 22 -36 29 57 -36 8 49 0.42 - 6 0 0 -36 42 29 12 17 11.9 38 96 66 -36 49 29 -36 35 30 -36 53 2 -36 31 57 0.42 - 5 0 0 -37 5 15 12 17 14.0 39 95 65 -37 12 14 -36 58 17 -37 15 47 -36 54 44 0.42 - 4 0 0 -37 27 40 12 17 16.2 40 95 65 -37 34 38 -37 20 42 -37 38 10 -37 17 10 0.42 - 3 0 0 -37 49 42 12 17 18.3 41 94 64 -37 56 39 -37 42 46 -38 0 12 -37 39 14 0.42 - 2 0 0 -38 11 23 12 17 20.5 41 93 64 -38 18 20 -38 4 28 -38 21 51 -38 0 56 0.42 - 1 0 0 -38 32 42 12 17 22.7 42 92 63 -38 39 37 -38 25 47 -38 43 9 -38 22 17 0.42 0 0 0 -38 53 39 12 17 25.0 43 91 62 -39 0 33 -38 46 45 -39 4 4 -38 43 15 0.42 1 0 0 -39 14 13 12 17 27.2 44 90 62 -39 21 6 -39 7 20 -39 24 37 -39 3 50 0.42 2 0 0 -39 34 25 12 17 29.5 44 89 61 -39 41 17 -39 27 33 -39 44 47 -39 24 3 0.42 3 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57 -29 14 37 -29 32 35 -29 10 58 0.44 139 0 0 -28 53 41 12 22 28.9 15 249 -39 -29 0 52 -28 46 31 -29 4 30 -28 42 53 0.44 140 0 0 -28 25 23 12 22 29.9 14 248 -40 -28 32 34 -28 18 13 -28 36 13 -28 14 34 0.44 141 0 0 -27 56 54 12 22 30.8 13 248 -41 -28 4 5 -27 49 43 -28 7 44 -27 46 5 0.45 142 0 0 -27 28 13 12 22 31.7 12 247 -42 -27 35 25 -27 21 3 -27 39 4 -27 17 24 0.45 143 0 0 -26 59 23 12 22 32.5 11 247 -43 -27 6 34 -26 52 12 -27 10 13 -26 48 33 0.45 144 0 0 -26 30 22 12 22 33.3 10 246 -44 -26 37 34 -26 23 11 -26 41 13 -26 19 32 0.46 145 0 0 -26 1 13 12 22 33.9 9 246 -44 -26 8 25 -25 54 2 -26 12 4 -25 50 23 0.46 146 0 0 -25 31 56 12 22 34.5 8 245 -45 -25 39 8 -25 24 45 -25 42 47 -25 21 6 0.47 147 0 0 -25 2 32 12 22 35.1 7 245 -46 -25 9 43 -24 55 21 -25 13 23 -24 51 42 0.47 148 0 0 -24 33 1 12 22 35.6 6 244 -47 -24 40 13 -24 25 50 -24 43 52 -24 22 11 0.48 149 0 0 -24 3 25 12 22 36.0 5 244 -48 -24 10 37 -23 56 14 -24 14 16 -23 52 35 0.49 150 0 0 -23 33 44 12 22 36.3 4 244 -49 -23 40 56 -23 26 33 -23 44 35 -23 22 54 0.51 151 0 0 -23 3 59 12 22 36.6 3 243 -50 -23 11 11 -22 56 49 -23 14 50 -22 53 10 0.54 152 0 0 -22 34 12 12 22 36.7 2 243 -51 -22 41 23 -22 27 1 -22 45 2 -22 23 22 0.60 153 0 0 -22 4 22 12 22 36.9 1 242 -52 -22 11 33 -21 57 11 -22 15 12 -21 53 33 0.78 154 0 0 -21 34 31 12 22 36.9 0 242 -53 -21 41 41 -21 27 20 -21 45 20 .. .. .. 7.24 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 321-143859 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 10 55.2228 DE: -25 54 26.678 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 10 55.2228 DE: -25 54 26.678 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * B mag [mag]: 12.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (16133) 1999 XC100 asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.41830 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): 0.016", 0.001", 98.21° remarks: * orbital elements for (16133)1999 XC100 : Mean anomaly = 22.9752872229 deg Arg. of pericenter = 175.0210156479 deg Long. of node = 90.2666083013 deg Inclination = 8.6768310754 deg Eccentricity = 0.0187450966 Semimajor axis = 3.1030765774 AU Perihelion dist = 3.0449091072 AU Mag: H = 12.79, G = 0.15 Epoch of elements : MJD 60608.51354742 TDT (2024 Oct 25.5135) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,0.68,2024,10,25,12.325145,-0.010840,-0.380486,17.852819,-0.487945,0.005130,-0.000018,-0.000001,0.000000 53.8529,-25.9032,-8.87,-12.37,False UCAC4 321-143859,18.18200638,-25.9074107,12.23,11.47,11.06,0.1,0,,18.20740818,-25.9032402,7.29,7.26,0,0,0 16133,1999 XC100,18.76,21.539,3.4183,0,0,3.404,-1.25,,1.8,0 0,22.8827,2024,10,25,175.0210,90.2666,8.6768,0.01875,3.10308,3.04491,12.79,5.0,0.15 1.254,0.0160,0.0012,98,0.0022,Known errors,0.55,0,-1,-1 20241025_143859,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org