IOTA/IOTA-ES occultation update for (66146) 1998 TU3 / TYC 8066-01300-1 event on 2024 Oct 31, 12:48 UT Visible from Summary ------- On 2024 Oct 31 UT, the 4.30208816790557 km diameter asteroid (66146) 1998 TU3 will occult a 9.6 mag star in the constellation Horologium for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.22 mag to 11.63 mag (the magnitude of the asteroid) for at most 0.400 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: 20 * date and approx. time of event: 2024 Oct 31, 12:38 - 2024 Oct 31, 12:58 * geocentric midpoint of event [JD]: 2460615.03375300 * magnitude of target star: 9.56 * magnitude drop [mag]: 2.22 * estimated maximum duration [s]: 0.400 * Moon: 1 % sunlit, 111° distance * Sun: 112° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 4 * 1 sigma uncertainty interval [path widths]: +/- 3.37 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.238, +/- 0.055) * 1 sigma uncertainty ellipse (major, minor, PA): (0.238", 0.053", 86°) * approx speed of asteroid's shadow [km/s]: 10.8969 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 8066-01300-1 by 66146 1998 TU3 on 2024 Oct 31 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 42 0 0 -32 27 25 12 58 13.3 1 155 32 -32 24 36 -32 30 14 -32 5 35 -32 49 11 .... 43 0 0 -34 13 30 12 58 12.4 3 155 31 -34 10 46 -34 16 13 -33 52 24 -34 34 32 -0.11 44 0 0 -35 53 14 12 58 10.9 5 154 30 -35 50 36 -35 55 52 -35 32 50 -36 13 35 -0.14 45 0 0 -37 27 6 12 58 9.0 7 154 29 -37 24 33 -37 29 39 -37 7 21 -37 46 50 -0.16 46 0 0 -38 55 33 12 58 6.6 9 153 29 -38 53 5 -38 58 1 -38 36 23 -39 14 41 -0.16 47 0 0 -40 18 57 12 58 3.8 10 152 28 -40 16 33 -40 21 21 -40 0 21 -40 37 32 -0.17 48 0 0 -41 37 41 12 58 0.8 12 152 27 -41 35 21 -41 40 1 -41 19 36 -41 55 45 -0.17 49 0 0 -42 52 4 12 57 57.6 13 151 26 -42 49 48 -42 54 20 -42 34 28 -43 9 39 -0.17 50 0 0 -44 2 24 12 57 54.2 15 150 25 -44 0 12 -44 4 37 -43 45 16 -44 19 32 -0.17 51 0 0 -45 8 59 12 57 50.6 16 150 24 -45 6 49 -45 11 8 -44 52 16 -45 25 40 -0.17 52 0 0 -46 12 2 12 57 46.8 17 149 24 -46 9 56 -46 14 9 -45 55 44 -46 28 19 -0.17 53 0 0 -47 11 49 12 57 43.0 18 148 23 -47 9 45 -47 13 52 -46 55 53 -47 27 43 -0.18 54 0 0 -48 8 31 12 57 39.1 19 148 22 -48 6 30 -48 10 31 -47 52 57 -48 24 4 -0.18 55 0 0 -49 2 21 12 57 35.2 21 147 22 -49 0 23 -49 4 19 -48 47 7 -49 17 33 -0.18 56 0 0 -49 53 29 12 57 31.2 22 146 21 -49 51 33 -49 55 24 -49 38 35 -50 8 22 -0.18 57 0 0 -50 42 5 12 57 27.2 23 146 20 -50 40 12 -50 43 58 -50 27 30 -50 56 40 -0.18 58 0 0 -51 28 19 12 57 23.1 24 145 20 -51 26 29 -51 30 10 -51 14 1 -51 42 37 -0.17 59 0 0 -52 12 19 12 57 19.1 25 144 19 -52 10 31 -52 14 8 -51 58 18 -52 26 20 -0.17 60 0 0 -52 54 13 12 57 15.0 25 143 18 -52 52 26 -52 56 0 -52 40 27 -53 7 58 -0.17 61 0 0 -53 34 8 12 57 11.0 26 143 18 -53 32 23 -53 35 52 -53 20 37 -53 47 38 -0.17 62 0 0 -54 12 10 12 57 6.9 27 142 17 -54 10 27 -54 13 53 -53 58 53 -54 25 26 -0.17 63 0 0 -54 48 26 12 57 2.9 28 141 17 -54 46 45 -54 50 7 -54 35 23 -55 1 29 -0.17 64 0 0 -55 23 2 12 56 58.9 29 140 16 -55 21 22 -55 24 41 -55 10 11 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-26 36 55 -0.18 -174 0 0 -24 10 22 12 44 23.7 63 183 -46 -24 7 23 -24 13 22 -23 47 13 -24 33 28 -0.18 -173 0 0 -21 59 36 12 44 2.5 60 184 -48 -21 56 31 -22 2 41 -21 35 43 -22 23 25 -0.18 -172 0 0 -19 41 52 12 43 40.8 58 185 -49 -19 38 41 -19 45 3 -19 17 13 -20 6 27 -0.18 -171 0 0 -17 16 53 12 43 18.7 56 186 -51 -17 13 36 -17 20 10 -16 51 25 -17 42 16 -0.18 -170 0 0 -14 44 22 12 42 56.2 53 186 -52 -14 40 59 -14 47 46 -14 18 2 -15 10 37 -0.19 -169 0 0 -12 4 4 12 42 33.5 50 187 -53 -12 0 33 -12 7 35 -11 36 48 -12 31 12 -0.19 -168 0 0 - 9 15 45 12 42 10.8 47 187 -55 - 9 12 6 - 9 19 23 - 8 47 31 - 9 43 51 -0.19 -167 0 0 - 6 19 16 12 41 48.1 44 188 -56 - 6 15 29 - 6 23 2 - 5 49 59 - 6 48 23 -0.19 -166 0 0 - 3 14 31 12 41 25.6 41 188 -57 - 3 10 36 - 3 18 26 - 2 44 9 - 3 44 44 -0.20 -165 0 0 - 0 1 33 12 41 3.8 38 188 -58 0 2 30 - 0 5 37 0 29 59 - 0 32 55 -0.20 -164 0 0 3 19 28 12 40 42.7 34 189 -58 3 23 42 3 15 15 3 52 15 2 46 55 -0.20 -163 0 0 6 48 14 12 40 22.8 31 189 -58 6 52 38 6 43 51 7 22 19 6 14 25 -0.20 -162 0 0 10 24 11 12 40 4.3 27 189 -58 10 28 44 10 19 37 10 59 36 9 49 2 -0.21 -161 0 0 14 6 27 12 39 47.5 23 190 -58 14 11 11 14 1 43 14 43 15 13 29 59 -0.21 -160 0 0 17 53 55 12 39 32.9 20 190 -57 17 58 49 17 49 1 18 32 5 17 16 6 -0.21 -159 0 0 21 45 2 12 39 20.7 16 190 -56 21 50 7 21 39 58 22 24 32 21 5 56 -0.22 -158 0 0 25 37 55 12 39 11.1 12 191 -55 25 43 10 25 32 42 26 18 40 24 57 37 -0.23 -157 0 0 29 30 20 12 39 4.3 8 191 -53 29 35 43 29 24 58 30 12 10 28 48 57 -0.24 -156 0 0 33 19 44 12 39 0.4 4 192 -51 33 25 14 33 14 15 34 2 26 32 37 30 -0.27 -155 0 0 37 3 30 12 38 59.2 0 192 -49 .. .. .. 36 57 56 .. .. .. 36 20 41 -72.47 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 8066-01300-1 * constellation : Horologium * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 39 13.7155 DE: -51 28 14.217 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 39 13.7157 DE: -51 28 14.221 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.6 * B mag [mag]: 9.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (66146) 1998 TU3 asteroid class: approx. diameter [km]: 4 approx. diameter ["]: 0.062 distance from Earth [AU]: 0.09530 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#358 date of fit: 2023 Mar 01 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): 0.238", 0.053", 86.312° remarks: * orbital elements for (66146)1998 TU3 : Mean anomaly = 251.2044824538 deg Arg. of pericenter = 84.9338607993 deg Long. of node = 101.9416540738 deg Inclination = 5.4110852223 deg Eccentricity = 0.4837693142 Semimajor axis = 0.7875406287 AU Perihelion dist = 0.4065526389 AU Mag: H = 14.43, G = 0.15 Epoch of elements : MJD 60614.53375196 TDT (2024 Oct 31.5338) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#3582023Mar01,0.40,2024,10,31,12.810072,-0.144893,0.068040,-2.613901,-5.567413,-0.000227,0.000618,0.000001,0.000000 -177.4724,-51.3871,-16.25,-14.37,False TYC 8066-01300-1,3.65380985,-51.4706153,9.83,9.56,9.41,0.1,0,,3.66622830,-51.3871368,2.22,1.96,0,0,0 66146,1998 TU3,11.63,4.309,0.0953,0,0,-25.876,-513.92,,1.2,0 0,250.4518,2024,10,31,84.9339,101.9417,5.4111,0.48377,0.78754,0.40655,14.43,5.0,0.15 4.370,0.2380,0.0530,86,0.2100,Known errors,0.87,0,-1,-1 20241031_1300-1,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org