IOTA/IOTA-ES occultation update for (13357) Werkhoven / UCAC4 378-159931 event on 2024 Oct 21, 17:47 UT Visible from Summary ------- On 2024 Oct 21 UT, the 9.88054577001945 km diameter asteroid (13357) Werkhoven will occult a 11.1 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 8.47 mag to 19.58 mag (the magnitude of the asteroid) for at most 0.540 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: 89 * date and approx. time of event: 2024 Oct 21, 17:42 - 2024 Oct 21, 17:53 * geocentric midpoint of event [JD]: 2460605.24153388 * magnitude of target star: 11.11 * magnitude drop [mag]: 8.47 * estimated maximum duration [s]: 0.540 * Moon: 76 % sunlit, 151° distance * Sun: 85° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 0.54 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.001", 78°) * approx speed of asteroid's shadow [km/s]: 18.5728 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 378-159931 by 13357 Werkhoven on 2024 Oct 21 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 - 94 0 0 - 9 40 36 17 42 9.7 0 105 85 - 9 43 28 - 9 37 43 - 9 46 33 - 9 34 38 .... - 93 0 0 - 9 56 10 17 42 9.8 1 104 86 - 9 59 2 - 9 53 17 -10 2 7 - 9 50 12 0.18 - 92 0 0 -10 11 43 17 42 10.0 2 104 87 -10 14 35 -10 8 51 -10 17 41 -10 5 45 0.17 - 91 0 0 -10 27 15 17 42 10.3 3 104 88 -10 30 8 -10 24 23 -10 33 13 -10 21 18 0.17 - 90 0 0 -10 42 46 17 42 10.7 4 104 89 -10 45 39 -10 39 54 -10 48 44 -10 36 49 0.17 - 89 0 0 -10 58 16 17 42 11.3 5 104 89 -11 1 8 -10 55 23 -11 4 13 -10 52 18 0.17 - 88 0 0 -11 13 43 17 42 11.9 6 104 88 -11 16 35 -11 10 51 -11 19 41 -11 7 46 0.17 - 87 0 0 -11 29 8 17 42 12.6 7 103 87 -11 32 0 -11 26 16 -11 35 6 -11 23 11 0.17 - 86 0 0 -11 44 31 17 42 13.5 8 103 86 -11 47 23 -11 41 38 -11 50 28 -11 38 33 0.17 - 85 0 0 -11 59 50 17 42 14.5 9 103 85 -12 2 42 -11 56 58 -12 5 48 -11 53 53 0.17 - 84 0 0 -12 15 7 17 42 15.5 10 103 84 -12 17 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0.29 87 0 0 - 8 35 0 17 53 27.5 1 255 -70 - 8 37 53 - 8 32 8 - 8 40 58 - 8 29 3 0.52 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 378-159931 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 36 03.1859 DE: -14 30 01.673 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 36 03.1859 DE: -14 30 01.674 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.1 * B mag [mag]: 12.1 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (13357) Werkhoven asteroid class: approx. diameter [km]: 10 approx. diameter ["]: 0.004 distance from Earth [AU]: 3.05340 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#46 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): 0.010", 0.001", 77.782° remarks: * orbital elements for (13357)Werkhoven : Mean anomaly = 140.3328834496 deg Arg. of pericenter = 295.1538148468 deg Long. of node = 226.1613475532 deg Inclination = 6.8615992175 deg Eccentricity = 0.1657420992 Semimajor axis = 2.7504665374 AU Perihelion dist = 2.2945984396 AU Mag: H = 13.73, G = 0.15 Epoch of elements : MJD 60604.74153359 TDT (2024 Oct 21.7415) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#462023Apr25,0.54,2024,10,21,17.796813,0.001367,-0.160879,10.482439,0.107396,0.005757,0.001023,0.000000,0.000000 -3.2529,-14.4458,-90.82,-11.06,False UCAC4 378-159931,19.60088500,-14.5004648,12.06,11.11,10.60,0.1,0,,19.62415913,-14.4457634,8.47,8.53,0,0,0 13357,Werkhoven,19.58,10.102,3.0534,0,0,2.079,0.31,,2.0,0 0,140.1727,2024,10,21,295.1538,226.1613,6.8616,0.16574,2.75047,2.29460,13.73,5.0,0.15 1.538,0.0100,0.0014,78,0.0024,Known errors,0.98,0,-1,-1 20241021_159931,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org