IOTA/IOTA-ES occultation update for (10148) Shirase / UCAC4 392-128110 event on 2024 Aug 05, 11:40 UT Visible from Summary ------- On 2024 Aug 05 UT, the 17.035 km diameter asteroid (10148) Shirase will occult a 11.7 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.74 mag to 17.47 mag (the magnitude of the asteroid) for at most 1.440 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: 93 * date and approx. time of event: 2024 Aug 05, 11:31 - 2024 Aug 05, 11:48 * geocentric midpoint of event [JD]: 2460527.98628063 * magnitude of target star: 11.74 * magnitude drop [mag]: 5.74 * estimated maximum duration [s]: 1.440 * Moon: 1 % sunlit, 174° distance * Sun: 163° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.011) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.005", 70°) * approx speed of asteroid's shadow [km/s]: 11.8548 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 392-128110 by 10148 Shirase on 2024 Aug 5 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 103 0 0 -37 54 59 11 48 45.7 1 104 -17 -37 49 59 -37 59 58 -37 45 18 -38 4 40 .... 104 0 0 -38 7 3 11 48 45.5 2 104 -18 -38 2 4 -38 12 2 -37 57 23 -38 16 44 0.29 105 0 0 -38 18 47 11 48 45.3 2 103 -19 -38 13 49 -38 23 46 -38 9 8 -38 28 27 0.30 106 0 0 -38 30 10 11 48 44.9 3 102 -19 -38 25 12 -38 35 8 -38 20 32 -38 39 49 0.30 107 0 0 -38 41 13 11 48 44.4 4 102 -20 -38 36 15 -38 46 10 -38 31 35 -38 50 50 0.30 108 0 0 -38 51 54 11 48 43.8 5 101 -21 -38 46 57 -38 56 52 -38 42 18 -39 1 31 0.31 109 0 0 -39 2 15 11 48 43.1 6 100 -22 -38 57 19 -39 7 12 -38 52 40 -39 11 51 0.31 110 0 0 -39 12 16 11 48 42.3 6 100 -22 -39 7 19 -39 17 12 -39 2 41 -39 21 51 0.31 111 0 0 -39 21 56 11 48 41.3 7 99 -23 -39 17 0 -39 26 52 -39 12 22 -39 31 30 0.31 112 0 0 -39 31 15 11 48 40.3 8 99 -24 -39 26 19 -39 36 11 -39 21 42 -39 40 49 0.31 113 0 0 -39 40 14 11 48 39.2 9 98 -25 -39 35 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.. .. .. .. .. 2 29 20 .. .. .. 2 24 40 .... Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 392-128110 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 10 31.3551 DE: -11 45 38.778 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 10 31.3551 DE: -11 45 38.777 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.7 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (10148) Shirase asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.20650 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.029", 0.005", 69.86° remarks: * orbital elements for (10148)Shirase : Mean anomaly = 79.1349792518 deg Arg. of pericenter = 220.7430170153 deg Long. of node = 9.0692469082 deg Inclination = 0.4540226774 deg Eccentricity = 0.1398087979 Semimajor axis = 3.2121523903 AU Perihelion dist = 2.7630652258 AU Mag: H = 12.79, G = 0.15 Epoch of elements : MJD 60527.48628112 TDT (2024 Aug 05.4863) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr25,1.44,2024,8,5,11.670735,0.107812,-0.288289,-6.266070,-2.346972,-0.001584,-0.000556,0.000001,0.000000 -156.6142,-11.6383,6.44,16.76,False UCAC4 392-128110,22.17537641,-11.7607716,12.02,11.74,11.59,0.0,0,,22.19759838,-11.6383464,5.73,5.44,0,0,0 10148,Shirase,17.47,17.035,2.2065,0,0,-1.700,-9.35,,1.6,0 0,79.0517,2024,8,5,220.7430,9.0692,0.4540,0.13981,3.21215,2.76307,12.79,5.0,0.15 1.470,0.0287,0.0050,70,0.0050,Known errors,2.07,0,-1,-1 20240805_128110,60140.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org