IOTA/IOTA-ES occultation update for (4961) Timherder / UCAC4 319-136396 event on 2024 Oct 01, 09:06 UT Visible from Summary ------- On 2024 Oct 01 UT, the 11.598 km diameter asteroid (4961) Timherder will occult a 11.4 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 6.40 mag to 17.79 mag (the magnitude of the asteroid) for at most 0.590 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 01, 09:00 - 2024 Oct 01, 09:11 * geocentric midpoint of event [JD]: 2460584.87917321 * magnitude of target star: 11.39 * magnitude drop [mag]: 6.40 * estimated maximum duration [s]: 0.590 * Moon: 2 % sunlit, 98° distance * Sun: 83° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.001", 83°) * approx speed of asteroid's shadow [km/s]: 19.7366 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 319-136396 by 4961 Timherder on 2024 Oct 1 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 36 0 0 - 3 11 42 9 0 40.6 1 116 84 - 3 15 14 - 3 8 10 - 3 16 59 - 3 6 25 .... 37 0 0 - 3 41 18 9 0 40.8 2 116 85 - 3 44 50 - 3 37 46 - 3 46 35 - 3 36 2 -0.02 38 0 0 - 4 10 37 9 0 41.0 3 116 86 - 4 14 8 - 4 7 5 - 4 15 53 - 4 5 21 -0.06 39 0 0 - 4 39 38 9 0 41.4 4 116 87 - 4 43 9 - 4 36 6 - 4 44 53 - 4 34 22 -0.08 40 0 0 - 5 8 20 9 0 42.0 5 116 87 - 5 11 50 - 5 4 49 - 5 13 34 - 5 3 5 -0.09 41 0 0 - 5 36 42 9 0 42.6 6 116 88 - 5 40 13 - 5 33 12 - 5 41 57 - 5 31 28 -0.10 42 0 0 - 6 4 45 9 0 43.4 7 116 87 - 6 8 15 - 6 1 15 - 6 9 59 - 5 59 31 -0.10 43 0 0 - 6 32 27 9 0 44.2 9 116 87 - 6 35 57 - 6 28 58 - 6 37 40 - 6 27 14 -0.11 44 0 0 - 6 59 48 9 0 45.2 10 116 86 - 7 3 17 - 6 56 19 - 7 5 1 - 6 54 36 -0.11 45 0 0 - 7 26 48 9 0 46.3 11 116 85 - 7 30 16 - 7 23 19 - 7 31 59 - 7 21 36 -0.11 46 0 0 - 7 53 25 9 0 47.6 12 115 84 - 7 56 53 - 7 49 57 - 7 58 36 - 7 48 14 -0.11 47 0 0 - 8 19 39 9 0 48.9 13 115 83 - 8 23 7 - 8 16 11 - 8 24 49 - 8 14 29 -0.12 48 0 0 - 8 45 30 9 0 50.3 14 115 82 - 8 48 57 - 8 42 3 - 8 50 40 - 8 40 20 -0.12 49 0 0 - 9 10 58 9 0 51.9 15 115 81 - 9 14 24 - 9 7 31 - 9 16 7 - 9 5 49 -0.12 50 0 0 - 9 36 1 9 0 53.5 16 115 80 - 9 39 27 - 9 32 35 - 9 41 9 - 9 30 53 -0.12 51 0 0 -10 0 40 9 0 55.3 17 115 79 -10 4 5 - 9 57 14 -10 5 47 - 9 55 32 -0.12 52 0 0 -10 24 53 9 0 57.2 18 115 78 -10 28 18 -10 21 28 -10 30 0 -10 19 46 -0.12 53 0 0 -10 48 42 9 0 59.1 19 114 77 -10 52 6 -10 45 17 -10 53 48 -10 43 35 -0.12 54 0 0 -11 12 4 9 1 1.2 20 114 76 -11 15 28 -11 8 40 -11 17 10 -11 6 59 -0.12 55 0 0 -11 35 1 9 1 3.4 22 114 75 -11 38 25 -11 31 37 -11 40 5 -11 29 56 -0.12 56 0 0 -11 57 31 9 1 5.6 23 114 74 -12 0 54 -11 54 7 -12 2 35 -11 52 27 -0.12 57 0 0 -12 19 34 9 1 8.0 24 114 73 -12 22 57 -12 16 11 -12 24 38 -12 14 31 -0.13 58 0 0 -12 41 11 9 1 10.4 25 113 72 -12 44 33 -12 37 48 -12 46 14 -12 36 8 -0.13 59 0 0 -13 2 20 9 1 13.0 26 113 71 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237 -40 - 1 50 58 - 1 43 50 - 1 52 44 - 1 42 4 -0.13 171 0 0 - 1 16 15 9 10 9.2 39 237 -41 - 1 19 50 - 1 12 41 - 1 21 36 - 1 10 55 -0.13 172 0 0 - 0 44 52 9 10 13.2 37 237 -42 - 0 48 27 - 0 41 17 - 0 50 13 - 0 39 31 -0.13 173 0 0 - 0 13 15 9 10 17.1 36 237 -43 - 0 16 50 - 0 9 40 - 0 18 36 - 0 7 53 -0.13 174 0 0 0 18 35 9 10 20.9 35 237 -44 0 15 0 0 22 10 0 13 13 0 23 57 -0.13 175 0 0 0 50 36 9 10 24.7 34 237 -45 0 47 1 0 54 12 0 45 14 0 55 59 -0.13 176 0 0 1 22 49 9 10 28.3 33 237 -46 1 19 13 1 26 25 1 17 26 1 28 12 -0.13 177 0 0 1 55 11 9 10 31.7 32 237 -47 1 51 35 1 58 47 1 49 48 2 0 34 -0.13 178 0 0 2 27 42 9 10 35.1 31 237 -48 2 24 6 2 31 19 2 22 19 2 33 6 -0.13 179 0 0 3 0 21 9 10 38.4 29 237 -49 2 56 45 3 3 58 2 54 58 3 5 45 -0.13 180 0 0 3 33 8 9 10 41.6 28 237 -50 3 29 31 3 36 45 3 27 44 3 38 32 -0.13 -179 0 0 4 6 0 9 10 44.6 27 238 -51 4 2 23 4 9 37 4 0 36 4 11 24 -0.13 -178 0 0 4 38 57 9 10 47.5 26 238 -52 4 35 20 4 42 34 4 33 33 4 44 22 -0.13 -177 0 0 5 11 59 9 10 50.3 25 238 -53 5 8 21 5 15 36 5 6 34 5 17 23 -0.13 -176 0 0 5 45 3 9 10 53.0 24 238 -54 5 41 26 5 48 40 5 39 38 5 50 28 -0.13 -175 0 0 6 18 9 9 10 55.6 23 238 -55 6 14 32 6 21 47 6 12 44 6 23 34 -0.13 -174 0 0 6 51 17 9 10 58.0 21 238 -56 6 47 39 6 54 54 6 45 52 6 56 42 -0.13 -173 0 0 7 24 24 9 11 0.3 20 238 -57 7 20 47 7 28 2 7 18 59 7 29 49 -0.13 -172 0 0 7 57 31 9 11 2.5 19 238 -58 7 53 53 8 1 8 7 52 5 8 2 56 -0.12 -171 0 0 8 30 35 9 11 4.6 18 239 -59 8 26 57 8 34 13 8 25 10 8 36 0 -0.12 -170 0 0 9 3 36 9 11 6.5 17 239 -60 8 59 59 9 7 14 8 58 11 9 9 2 -0.12 -169 0 0 9 36 34 9 11 8.3 16 239 -61 9 32 56 9 40 11 9 31 9 9 41 59 -0.12 -168 0 0 10 9 27 9 11 10.0 15 239 -62 10 5 49 10 13 4 10 4 2 10 14 52 -0.12 -167 0 0 10 42 13 9 11 11.6 14 239 -63 10 38 36 10 45 51 10 36 48 10 47 38 -0.12 -166 0 0 11 14 53 9 11 13.0 12 240 -63 11 11 16 11 18 30 11 9 28 11 20 18 -0.12 -165 0 0 11 47 25 9 11 14.3 11 240 -64 11 43 48 11 51 2 11 42 1 11 52 50 -0.12 -164 0 0 12 19 49 9 11 15.5 10 240 -65 12 16 12 12 23 26 12 14 24 12 25 13 -0.12 -163 0 0 12 52 3 9 11 16.5 9 240 -66 12 48 26 12 55 39 12 46 39 12 57 27 -0.12 -162 0 0 13 24 6 9 11 17.5 8 240 -67 13 20 29 13 27 43 13 18 42 13 29 30 -0.12 -161 0 0 13 55 58 9 11 18.3 7 241 -67 13 52 22 13 59 35 13 50 35 14 1 22 -0.12 -160 0 0 14 27 38 9 11 19.0 6 241 -68 14 24 2 14 31 14 14 22 15 14 33 1 -0.11 -159 0 0 14 59 5 9 11 19.5 5 241 -68 14 55 29 15 2 41 14 53 42 15 4 28 -0.11 -158 0 0 15 30 19 9 11 20.0 3 241 -69 15 26 43 15 33 54 15 24 56 15 35 41 -0.10 -157 0 0 16 1 17 9 11 20.3 2 242 -69 15 57 42 16 4 53 15 55 55 16 6 40 -0.09 -156 0 0 16 32 1 9 11 20.5 1 242 -70 16 28 26 16 35 36 16 26 40 16 37 23 -0.06 -155 0 0 17 2 29 9 11 20.5 0 242 -70 16 58 54 17 6 4 16 57 8 17 7 50 0.25 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 319-136396 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 08 00.5547 DE: -26 22 06.293 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 08 00.5546 DE: -26 22 06.293 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.4 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4961) Timherder asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.79650 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): 0.019", 0.001", 82.599° remarks: * orbital elements for (4961)Timherder : Mean anomaly = 306.6827746830 deg Arg. of pericenter = 55.0383737291 deg Long. of node = 313.6821177508 deg Inclination = 7.7980283465 deg Eccentricity = 0.2195743980 Semimajor axis = 3.1573784027 AU Perihelion dist = 2.4640989406 AU Mag: H = 12.27, G = 0.15 Epoch of elements : MJD 60584.37917284 TDT (2024 Oct 01.3792) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr25,0.59,2024,10,1,9.100157,-0.026922,0.136261,10.931257,2.145942,0.005746,0.000061,0.000000,0.000000 125.2907,-26.3661,40.88,-3.44,False UCAC4 319-136396,18.13348745,-26.3684148,12.04,11.39,11.04,0.0,0,,18.15907863,-26.3661410,6.40,6.30,0,0,0 4961,Timherder,17.79,11.598,2.7965,0,0,2.558,6.75,,1.2,0 0,306.6162,2024,10,1,55.0384,313.6821,7.7980,0.21957,3.15738,2.46410,12.26,5.0,0.15 1.247,0.0187,0.0008,83,0.0014,Known errors,0.56,0,-1,-1 20241001_136396,60140.60 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org