IOTA/IOTA-ES occultation update for (4961) Timherder / UCAC4 323-179728 event on 2024 Oct 19, 22:34 UT Visible from Summary ------- On 2024 Oct 19 UT, the 11.569 km diameter asteroid (4961) Timherder will occult a 11.7 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 6.18 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 19, 22:30 - 2024 Oct 19, 22:38 * geocentric midpoint of event [JD]: 2460603.44084179 * magnitude of target star: 11.70 * magnitude drop [mag]: 6.18 * estimated maximum duration [s]: 0.430 * Moon: 91 % sunlit, 145° distance * Sun: 70° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 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]: 26.8235 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 323-179728 by 4961 Timherder on 2024 Oct 19 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 172 0 0 -20 28 30 22 30 56.3 1 117 63 -20 32 7 -20 24 53 -20 33 7 -20 23 53 .... 173 0 0 -20 57 24 22 30 56.4 2 117 63 -21 1 0 -20 53 47 -21 2 1 -20 52 47 0.25 174 0 0 -21 26 3 22 30 56.6 3 116 64 -21 29 39 -21 22 27 -21 30 40 -21 21 26 0.24 175 0 0 -21 54 27 22 30 56.9 4 116 65 -21 58 3 -21 50 51 -21 59 4 -21 49 51 0.23 176 0 0 -22 22 35 22 30 57.2 5 115 65 -22 26 11 -22 19 0 -22 27 12 -22 17 59 0.23 177 0 0 -22 50 27 22 30 57.7 6 115 66 -22 54 3 -22 46 52 -22 55 3 -22 45 52 0.23 178 0 0 -23 18 2 22 30 58.2 7 115 67 -23 21 37 -23 14 27 -23 22 37 -23 13 27 0.23 179 0 0 -23 45 19 22 30 58.8 8 114 67 -23 48 54 -23 41 44 -23 49 54 -23 40 44 0.23 -180 0 0 -24 12 18 22 30 59.4 9 114 68 -24 15 52 -24 8 43 -24 16 52 -24 7 43 0.23 -179 0 0 -24 38 58 22 31 0.1 10 113 68 -24 42 32 -24 35 24 -24 43 32 -24 34 24 0.23 -178 0 0 -25 5 19 22 31 0.9 11 113 69 -25 8 52 -25 1 45 -25 9 52 -25 0 45 0.23 -177 0 0 -25 31 20 22 31 1.8 12 113 69 -25 34 53 -25 27 47 -25 35 53 -25 26 47 0.23 -176 0 0 -25 57 1 22 31 2.7 13 112 69 -26 0 34 -25 53 28 -26 1 34 -25 52 29 0.23 -175 0 0 -26 22 22 22 31 3.7 14 112 70 -26 25 54 -26 18 49 -26 26 54 -26 17 50 0.23 -174 0 0 -26 47 21 22 31 4.8 15 111 70 -26 50 54 -26 43 49 -26 51 53 -26 42 50 0.23 -173 0 0 -27 12 0 22 31 6.0 16 111 70 -27 15 32 -27 8 28 -27 16 31 -27 7 29 0.22 -172 0 0 -27 36 16 22 31 7.1 17 110 70 -27 39 48 -27 32 45 -27 40 47 -27 31 46 0.22 -171 0 0 -28 0 11 22 31 8.4 18 110 70 -28 3 42 -27 56 40 -28 4 41 -27 55 41 0.22 -170 0 0 -28 23 43 22 31 9.7 19 109 70 -28 27 14 -28 20 13 -28 28 13 -28 19 14 0.22 -169 0 0 -28 46 53 22 31 11.1 20 109 70 -28 50 23 -28 43 23 -28 51 22 -28 42 25 0.22 -168 0 0 -29 9 40 22 31 12.5 21 108 70 -29 13 10 -29 6 11 -29 14 8 -29 5 12 0.22 -167 0 0 -29 32 4 22 31 14.0 22 108 70 -29 35 33 -29 28 35 -29 36 31 -29 27 36 0.22 -166 0 0 -29 54 4 22 31 15.5 23 107 70 -29 57 33 -29 50 36 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33 0 0 -18 58 10 22 37 52.6 37 252 -33 -19 1 48 -18 54 32 -19 2 48 -18 53 31 0.23 - 32 0 0 -18 28 1 22 37 55.3 36 251 -34 -18 31 39 -18 24 23 -18 32 41 -18 23 22 0.23 - 31 0 0 -17 57 42 22 37 57.9 35 251 -35 -18 1 20 -17 54 4 -18 2 21 -17 53 3 0.23 - 30 0 0 -17 27 12 22 38 0.5 33 251 -36 -17 30 50 -17 23 33 -17 31 51 -17 22 32 0.23 - 29 0 0 -16 56 32 22 38 3.0 32 250 -37 -17 0 10 -16 52 53 -17 1 11 -16 51 52 0.23 - 28 0 0 -16 25 43 22 38 5.5 31 250 -38 -16 29 21 -16 22 4 -16 30 22 -16 21 3 0.23 - 27 0 0 -15 54 45 22 38 7.9 30 249 -39 -15 58 24 -15 51 7 -15 59 25 -15 50 6 0.23 - 26 0 0 -15 23 41 22 38 10.2 29 249 -41 -15 27 20 -15 20 2 -15 28 21 -15 19 1 0.23 - 25 0 0 -14 52 30 22 38 12.4 28 249 -42 -14 56 9 -14 48 52 -14 57 10 -14 47 50 0.23 - 24 0 0 -14 21 14 22 38 14.6 27 248 -43 -14 24 53 -14 17 35 -14 25 54 -14 16 34 0.23 - 23 0 0 -13 49 54 22 38 16.7 26 248 -44 -13 53 32 -13 46 15 -13 54 34 -13 45 14 0.23 - 22 0 0 -13 18 29 22 38 18.7 25 248 -45 -13 22 8 -13 14 50 -13 23 9 -13 13 49 0.23 - 21 0 0 -12 47 2 22 38 20.6 24 247 -46 -12 50 41 -12 43 23 -12 51 42 -12 42 22 0.24 - 20 0 0 -12 15 33 22 38 22.5 22 247 -47 -12 19 12 -12 11 55 -12 20 13 -12 10 53 0.24 - 19 0 0 -11 44 3 22 38 24.2 21 247 -48 -11 47 42 -11 40 25 -11 48 43 -11 39 24 0.24 - 18 0 0 -11 12 34 22 38 25.9 20 247 -49 -11 16 12 -11 8 55 -11 17 13 -11 7 54 0.24 - 17 0 0 -10 41 5 22 38 27.5 19 247 -51 -10 44 43 -10 37 27 -10 45 45 -10 36 26 0.24 - 16 0 0 -10 9 38 22 38 29.0 18 246 -52 -10 13 16 -10 6 0 -10 14 18 -10 4 59 0.24 - 15 0 0 - 9 38 14 22 38 30.5 17 246 -53 - 9 41 52 - 9 34 36 - 9 42 53 - 9 33 35 0.24 - 14 0 0 - 9 6 54 22 38 31.8 16 246 -54 - 9 10 32 - 9 3 16 - 9 11 33 - 9 2 15 0.24 - 13 0 0 - 8 35 38 22 38 33.1 15 246 -55 - 8 39 16 - 8 32 0 - 8 40 17 - 8 30 59 0.24 - 12 0 0 - 8 4 28 22 38 34.2 14 246 -56 - 8 8 6 - 8 0 50 - 8 9 6 - 7 59 50 0.24 - 11 0 0 - 7 33 24 22 38 35.3 12 245 -57 - 7 37 2 - 7 29 47 - 7 38 2 - 7 28 46 0.25 - 10 0 0 - 7 2 28 22 38 36.3 11 245 -58 - 7 6 5 - 6 58 51 - 7 7 6 - 6 57 50 0.25 - 9 0 0 - 6 31 40 22 38 37.2 10 245 -59 - 6 35 17 - 6 28 3 - 6 36 17 - 6 27 2 0.25 - 8 0 0 - 6 1 1 22 38 38.0 9 245 -61 - 6 4 37 - 5 57 24 - 6 5 38 - 5 56 23 0.26 - 7 0 0 - 5 30 31 22 38 38.7 8 245 -62 - 5 34 8 - 5 26 55 - 5 35 8 - 5 25 54 0.26 - 6 0 0 - 5 0 13 22 38 39.3 7 245 -63 - 5 3 49 - 4 56 37 - 5 4 49 - 4 55 36 0.27 - 5 0 0 - 4 30 6 22 38 39.8 6 245 -64 - 4 33 41 - 4 26 30 - 4 34 42 - 4 25 30 0.27 - 4 0 0 - 4 0 11 22 38 40.2 5 245 -65 - 4 3 46 - 3 56 36 - 4 4 46 - 3 55 35 0.28 - 3 0 0 - 3 30 29 22 38 40.6 4 245 -66 - 3 34 4 - 3 26 54 - 3 35 4 - 3 25 54 0.30 - 2 0 0 - 3 1 1 22 38 40.8 2 245 -67 - 3 4 36 - 2 57 27 - 3 5 36 - 2 56 27 0.34 - 1 0 0 - 2 31 48 22 38 41.0 1 245 -68 - 2 35 22 - 2 28 14 - 2 36 22 - 2 27 14 0.44 0 0 0 - 2 2 50 22 38 41.0 0 245 -69 - 2 6 24 - 1 59 16 - 2 7 24 - 1 58 16 1.82 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 323-179728 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 29 36.9711 DE: -25 29 50.170 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 29 36.9708 DE: -25 29 50.170 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.7 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4961) Timherder asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.00280 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", 79.979° remarks: * orbital elements for (4961)Timherder : Mean anomaly = 309.9391205405 deg Arg. of pericenter = 55.0429482465 deg Long. of node = 313.6818823775 deg Inclination = 7.7981175339 deg Eccentricity = 0.2195647542 Semimajor axis = 3.1573088802 AU Perihelion dist = 2.4640751320 AU Mag: H = 12.27, G = 0.15 Epoch of elements : MJD 60602.94084171 TDT (2024 Oct 19.9408) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr25,0.43,2024,10,19,22.580203,0.037224,-0.207895,14.908878,2.634930,0.005433,0.000214,0.000000,0.000000 -89.8072,-25.4820,-162.50,-10.42,False UCAC4 323-179728,18.49360311,-25.4972694,12.18,11.70,11.44,0.0,0,,18.51893750,-25.4819507,6.18,5.99,0,0,0 4961,Timherder,17.88,11.569,3.0028,0,0,3.225,7.72,,1.2,0 0,309.7738,2024,10,19,55.0429,313.6819,7.7981,0.21956,3.15731,2.46408,12.26,5.0,0.15 1.140,0.0177,0.0007,80,0.0007,Known errors,1.89,0,-1,-1 20241019_179728,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org