IOTA/IOTA-ES occultation update for (4961) Timherder / UCAC4 323-180720 event on 2024 Oct 20, 11:41 UT Visible from Summary ------- On 2024 Oct 20 UT, the 11.4597949838477 km diameter asteroid (4961) Timherder will occult a 10.5 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 7.37 mag to 17.88 mag (the magnitude of the asteroid) for at most 0.430 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 20, 11:37 - 2024 Oct 20, 11:45 * geocentric midpoint of event [JD]: 2460603.98716117 * magnitude of target star: 10.51 * magnitude drop [mag]: 7.37 * estimated maximum duration [s]: 0.430 * Moon: 88 % sunlit, 151° distance * Sun: 70° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.001", 80°) * approx speed of asteroid's shadow [km/s]: 27.0215 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 323-180720 by 4961 Timherder on 2024 Oct 20 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 - 16 0 0 - 0 59 18 11 37 37.7 0 115 70 - 1 2 51 - 0 55 45 - 1 3 46 - 0 54 50 .... - 15 0 0 - 1 27 52 11 37 37.7 1 115 71 - 1 31 24 - 1 24 19 - 1 32 19 - 1 23 24 0.01 - 14 0 0 - 1 56 10 11 37 37.9 3 115 72 - 1 59 42 - 1 52 38 - 2 0 37 - 1 51 43 -0.06 - 13 0 0 - 2 24 12 11 37 38.1 4 115 73 - 2 27 44 - 2 20 40 - 2 28 39 - 2 19 45 -0.09 - 12 0 0 - 2 51 58 11 37 38.5 5 115 74 - 2 55 29 - 2 48 26 - 2 56 24 - 2 47 31 -0.10 - 11 0 0 - 3 19 26 11 37 38.9 6 115 75 - 3 22 57 - 3 15 55 - 3 23 52 - 3 15 0 -0.11 - 10 0 0 - 3 46 36 11 37 39.4 7 115 76 - 3 50 7 - 3 43 5 - 3 51 2 - 3 42 11 -0.12 - 9 0 0 - 4 13 28 11 37 40.0 8 115 78 - 4 16 58 - 4 9 58 - 4 17 53 - 4 9 3 -0.12 - 8 0 0 - 4 40 0 11 37 40.7 9 115 79 - 4 43 30 - 4 36 30 - 4 44 25 - 4 35 36 -0.13 - 7 0 0 - 5 6 13 11 37 41.4 10 115 80 - 5 9 43 - 5 2 44 - 5 10 37 - 5 1 49 -0.13 - 6 0 0 - 5 32 6 11 37 42.3 11 115 81 - 5 35 35 - 5 28 37 - 5 36 29 - 5 27 42 -0.13 - 5 0 0 - 5 57 38 11 37 43.2 12 115 82 - 6 1 6 - 5 54 9 - 6 2 0 - 5 53 15 -0.14 - 4 0 0 - 6 22 48 11 37 44.2 13 115 83 - 6 26 16 - 6 19 20 - 6 27 10 - 6 18 26 -0.14 - 3 0 0 - 6 47 37 11 37 45.3 15 115 84 - 6 51 5 - 6 44 9 - 6 51 59 - 6 43 15 -0.14 - 2 0 0 - 7 12 4 11 37 46.5 16 114 85 - 7 15 31 - 7 8 36 - 7 16 25 - 7 7 42 -0.14 - 1 0 0 - 7 36 8 11 37 47.7 17 114 86 - 7 39 35 - 7 32 41 - 7 40 28 - 7 31 47 -0.14 0 0 0 - 7 59 49 11 37 49.1 18 114 87 - 8 3 15 - 7 56 22 - 8 4 9 - 7 55 29 -0.14 1 0 0 - 8 23 6 11 37 50.5 19 114 88 - 8 26 32 - 8 19 40 - 8 27 26 - 8 18 47 -0.14 2 0 0 - 8 46 0 11 37 51.9 20 114 88 - 8 49 26 - 8 42 34 - 8 50 19 - 8 41 41 -0.14 3 0 0 - 9 8 30 11 37 53.5 21 114 88 - 9 11 55 - 9 5 4 - 9 12 48 - 9 4 11 -0.14 4 0 0 - 9 30 35 11 37 55.1 22 114 87 - 9 33 59 - 9 27 10 - 9 34 52 - 9 26 17 -0.15 5 0 0 - 9 52 15 11 37 56.8 23 114 87 - 9 55 39 - 9 48 50 - 9 56 32 - 9 47 57 -0.15 6 0 0 -10 13 30 11 37 58.5 24 113 86 -10 16 54 -10 10 6 -10 17 47 -10 9 13 -0.15 7 0 0 -10 34 20 11 38 0.4 25 113 85 -10 37 43 -10 30 56 -10 38 36 -10 30 3 -0.15 8 0 0 -10 54 44 11 38 2.2 26 113 84 -10 58 7 -10 51 20 -10 58 59 -10 50 28 -0.15 9 0 0 -11 14 42 11 38 4.2 27 113 83 -11 18 4 -11 11 19 -11 18 57 -11 10 26 -0.15 10 0 0 -11 34 14 11 38 6.2 28 113 82 -11 37 36 -11 30 51 -11 38 28 -11 29 59 -0.15 11 0 0 -11 53 19 11 38 8.3 29 113 81 -11 56 41 -11 49 57 -11 57 33 -11 49 5 -0.15 12 0 0 -12 11 58 11 38 10.5 30 113 80 -12 15 19 -12 8 37 -12 16 12 -12 7 44 -0.15 13 0 0 -12 30 10 11 38 12.7 31 112 79 -12 33 31 -12 26 49 -12 34 23 -12 25 57 -0.15 14 0 0 -12 47 55 11 38 14.9 32 112 78 -12 51 16 -12 44 35 -12 52 8 -12 43 43 -0.15 15 0 0 -13 5 13 11 38 17.2 33 112 77 -13 8 33 -13 1 53 -13 9 25 -13 1 1 -0.15 16 0 0 -13 22 4 11 38 19.6 34 112 76 -13 25 24 -13 18 44 -13 26 16 -13 17 52 -0.15 17 0 0 -13 38 27 11 38 22.1 35 112 75 -13 41 47 -13 35 8 -13 42 38 -13 34 16 -0.15 18 0 0 -13 54 23 11 38 24.6 36 112 74 -13 57 42 -13 51 4 -13 58 34 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-0.16 92 0 0 -11 36 0 11 42 54.5 67 230 1 -11 39 23 -11 32 38 -11 40 15 -11 31 45 -0.16 93 0 0 -11 16 21 11 42 58.6 66 231 0 -11 19 44 -11 12 58 -11 20 37 -11 12 6 -0.16 94 0 0 -10 56 15 11 43 2.6 65 231 -1 -10 59 39 -10 52 52 -11 0 31 -10 51 59 -0.16 95 0 0 -10 35 43 11 43 6.5 64 232 -3 -10 39 6 -10 32 19 -10 39 59 -10 31 26 -0.16 96 0 0 -10 14 43 11 43 10.5 63 232 -4 -10 18 8 -10 11 19 -10 19 1 -10 10 26 -0.16 97 0 0 - 9 53 18 11 43 14.4 62 233 -5 - 9 56 43 - 9 49 54 - 9 57 36 - 9 49 0 -0.16 98 0 0 - 9 31 27 11 43 18.4 61 233 -6 - 9 34 52 - 9 28 2 - 9 35 46 - 9 27 9 -0.16 99 0 0 - 9 9 11 11 43 22.2 60 233 -7 - 9 12 36 - 9 5 45 - 9 13 30 - 9 4 52 -0.16 100 0 0 - 8 46 29 11 43 26.1 59 234 -8 - 8 49 55 - 8 43 3 - 8 50 48 - 8 42 9 -0.16 101 0 0 - 8 23 22 11 43 29.9 58 234 -9 - 8 26 49 - 8 19 56 - 8 27 42 - 8 19 2 -0.16 102 0 0 - 7 59 51 11 43 33.7 57 234 -10 - 8 3 18 - 7 56 24 - 8 4 11 - 7 55 30 -0.16 103 0 0 - 7 35 55 11 43 37.5 56 235 -11 - 7 39 23 - 7 32 28 - 7 40 16 - 7 31 34 -0.16 104 0 0 - 7 11 36 11 43 41.2 55 235 -12 - 7 15 4 - 7 8 8 - 7 15 58 - 7 7 14 -0.16 105 0 0 - 6 46 54 11 43 44.9 54 235 -13 - 6 50 22 - 6 43 25 - 6 51 16 - 6 42 31 -0.16 106 0 0 - 6 21 48 11 43 48.6 53 235 -14 - 6 25 17 - 6 18 19 - 6 26 11 - 6 17 25 -0.16 107 0 0 - 5 56 20 11 43 52.2 52 235 -15 - 5 59 49 - 5 52 51 - 6 0 44 - 5 51 57 -0.16 108 0 0 - 5 30 31 11 43 55.7 51 236 -16 - 5 34 0 - 5 27 1 - 5 34 54 - 5 26 7 -0.15 109 0 0 - 5 4 19 11 43 59.2 50 236 -17 - 5 7 49 - 5 0 49 - 5 8 44 - 4 59 55 -0.15 110 0 0 - 4 37 47 11 44 2.7 48 236 -19 - 4 41 17 - 4 34 17 - 4 42 12 - 4 33 22 -0.15 111 0 0 - 4 10 55 11 44 6.1 47 236 -20 - 4 14 25 - 4 7 24 - 4 15 20 - 4 6 29 -0.15 112 0 0 - 3 43 42 11 44 9.5 46 236 -21 - 3 47 13 - 3 40 11 - 3 48 8 - 3 39 16 -0.15 113 0 0 - 3 16 11 11 44 12.8 45 236 -22 - 3 19 42 - 3 12 39 - 3 20 37 - 3 11 44 -0.15 114 0 0 - 2 48 21 11 44 16.1 44 236 -23 - 2 51 53 - 2 44 49 - 2 52 48 - 2 43 54 -0.15 115 0 0 - 2 20 13 11 44 19.3 43 237 -24 - 2 23 45 - 2 16 41 - 2 24 40 - 2 15 45 -0.15 116 0 0 - 1 51 48 11 44 22.4 42 237 -25 - 1 55 21 - 1 48 15 - 1 56 16 - 1 47 20 -0.15 117 0 0 - 1 23 6 11 44 25.5 41 237 -26 - 1 26 39 - 1 19 33 - 1 27 35 - 1 18 38 -0.15 118 0 0 - 0 54 9 11 44 28.5 40 237 -27 - 0 57 42 - 0 50 35 - 0 58 38 - 0 49 40 -0.15 119 0 0 - 0 24 56 11 44 31.5 39 237 -28 - 0 28 30 - 0 21 22 - 0 29 25 - 0 20 27 -0.15 120 0 0 0 4 31 11 44 34.4 37 237 -29 0 0 57 0 8 5 0 0 1 0 9 1 -0.15 121 0 0 0 34 11 11 44 37.2 36 237 -31 0 30 37 0 37 46 0 29 41 0 38 41 -0.15 122 0 0 1 4 5 11 44 39.9 35 237 -32 1 0 30 1 7 39 0 59 34 1 8 35 -0.15 123 0 0 1 34 10 11 44 42.6 34 237 -33 1 30 35 1 37 45 1 29 39 1 38 41 -0.15 124 0 0 2 4 26 11 44 45.2 33 238 -34 2 0 51 2 8 2 1 59 55 2 8 58 -0.15 125 0 0 2 34 53 11 44 47.7 32 238 -35 2 31 18 2 38 29 2 30 22 2 39 25 -0.15 126 0 0 3 5 30 11 44 50.2 31 238 -36 3 1 54 3 9 5 3 0 58 3 10 1 -0.15 127 0 0 3 36 15 11 44 52.6 30 238 -37 3 32 39 3 39 51 3 31 43 3 40 47 -0.15 128 0 0 4 7 7 11 44 54.8 28 238 -38 4 3 31 4 10 43 4 2 35 4 11 40 -0.15 129 0 0 4 38 7 11 44 57.0 27 238 -39 4 34 30 4 41 43 4 33 34 4 42 39 -0.15 130 0 0 5 9 12 11 44 59.2 26 238 -40 5 5 36 5 12 49 5 4 40 5 13 45 -0.15 131 0 0 5 40 23 11 45 1.2 25 238 -41 5 36 46 5 44 0 5 35 50 5 44 56 -0.15 132 0 0 6 11 38 11 45 3.2 24 239 -42 6 8 1 6 15 15 6 7 5 6 16 11 -0.15 133 0 0 6 42 56 11 45 5.0 23 239 -44 6 39 19 6 46 33 6 38 23 6 47 29 -0.15 134 0 0 7 14 17 11 45 6.8 22 239 -45 7 10 40 7 17 54 7 9 43 7 18 50 -0.15 135 0 0 7 45 39 11 45 8.5 21 239 -46 7 42 2 7 49 16 7 41 5 7 50 12 -0.15 136 0 0 8 17 1 11 45 10.1 19 239 -47 8 13 24 8 20 38 8 12 28 8 21 35 -0.15 137 0 0 8 48 23 11 45 11.6 18 239 -48 8 44 46 8 52 1 8 43 50 8 52 57 -0.15 138 0 0 9 19 44 11 45 13.1 17 240 -49 9 16 7 9 23 22 9 15 11 9 24 18 -0.15 139 0 0 9 51 3 11 45 14.4 16 240 -50 9 47 26 9 54 40 9 46 30 9 55 37 -0.15 140 0 0 10 22 19 11 45 15.6 15 240 -51 10 18 42 10 25 56 10 17 45 10 26 53 -0.15 141 0 0 10 53 31 11 45 16.8 14 240 -52 10 49 54 10 57 8 10 48 57 10 58 4 -0.15 142 0 0 11 24 38 11 45 17.9 13 240 -53 11 21 1 11 28 15 11 20 4 11 29 11 -0.15 143 0 0 11 55 39 11 45 18.8 12 241 -54 11 52 2 11 59 16 11 51 6 12 0 12 -0.15 144 0 0 12 26 34 11 45 19.7 11 241 -55 12 22 57 12 30 11 12 22 1 12 31 7 -0.15 145 0 0 12 57 21 11 45 20.5 9 241 -56 12 53 44 13 0 58 12 52 48 13 1 54 -0.14 146 0 0 13 28 0 11 45 21.2 8 241 -57 13 24 24 13 31 37 13 23 27 13 32 33 -0.14 147 0 0 13 58 30 11 45 21.9 7 241 -58 13 54 54 14 2 7 13 53 58 14 3 3 -0.14 148 0 0 14 28 51 11 45 22.4 6 242 -59 14 25 14 14 32 27 14 24 18 14 33 23 -0.14 149 0 0 14 59 0 11 45 22.8 5 242 -60 14 55 24 15 2 37 14 54 28 15 3 33 -0.14 150 0 0 15 28 59 11 45 23.2 4 242 -61 15 25 23 15 32 35 15 24 27 15 33 31 -0.13 151 0 0 15 58 45 11 45 23.5 3 242 -61 15 55 9 16 2 21 15 54 13 16 3 17 -0.13 152 0 0 16 28 18 11 45 23.6 2 243 -62 16 24 43 16 31 54 16 23 47 16 32 50 -0.11 153 0 0 16 57 38 11 45 23.7 1 243 -63 16 54 3 17 1 14 16 53 7 17 2 10 -0.06 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 323-180720 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 30 19.3992 DE: -25 28 11.269 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 30 19.3991 DE: -25 28 11.269 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.5 * B mag [mag]: 11.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4961) Timherder asteroid class: approx. diameter [km]: 11 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.00860 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 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): 0.018", 0.001", 79.897° remarks: * orbital elements for (4961)Timherder : Mean anomaly = 310.0349572770 deg Arg. of pericenter = 55.0430917280 deg Long. of node = 313.6818757508 deg Inclination = 7.7981203498 deg Eccentricity = 0.2195644460 Semimajor axis = 3.1573066750 AU Perihelion dist = 2.4640743840 AU Mag: H = 12.27, G = 0.15 Epoch of elements : MJD 60603.48716083 TDT (2024 Oct 20.4872) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr25,0.43,2024,10,20,11.691868,-0.027603,0.155458,15.018737,2.655385,0.005426,0.000219,0.000000,0.000000 73.1560,-25.4540,0.80,-10.61,False UCAC4 323-180720,18.50538871,-25.4697968,11.23,10.51,10.12,0.1,0,,18.53071622,-25.4540466,7.37,7.31,0,0,0 4961,Timherder,17.88,11.678,3.0086,0,0,3.242,7.77,,1.2,0 0,309.9494,2024,10,20,55.0431,313.6819,7.7981,0.21956,3.15731,2.46407,12.26,5.0,0.15 1.130,0.0177,0.0007,80,0.0007,Known errors,0.69,0,-1,-1 20241020_180720,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org