IOTA/IOTA-ES occultation update for (1999) Hirayama / G184339.7-163718 event on 2024 Oct 12, 20:45 UT Visible from Summary ------- On 2024 Oct 12 UT, the 35.893864959161 km diameter asteroid (1999) Hirayama 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 5.52 mag to 17.25 mag (the magnitude of the asteroid) for at most 1.810 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 12, 20:40 - 2024 Oct 12, 20:50 * geocentric midpoint of event [JD]: 2460596.36515662 * magnitude of target star: 11.74 * magnitude drop [mag]: 5.52 * estimated maximum duration [s]: 1.810 * Moon: 72 % sunlit, 37° distance * Sun: 81° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.004", 91°) * approx speed of asteroid's shadow [km/s]: 20.6845 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G184339.7-163718 by 1999 Hirayama on 2024 Oct 12 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 -142 0 0 - 4 17 31 20 40 52.9 0 107 81 - 4 28 33 - 4 6 30 - 4 35 33 - 3 59 31 .... -141 0 0 - 4 35 41 20 40 52.9 1 107 82 - 4 46 44 - 4 24 39 - 4 53 44 - 4 17 40 0.25 -140 0 0 - 4 54 6 20 40 53.1 2 106 83 - 5 5 9 - 4 43 3 - 5 12 10 - 4 36 3 0.27 -139 0 0 - 5 12 45 20 40 53.4 3 106 84 - 5 23 49 - 5 1 42 - 5 30 51 - 4 54 41 0.28 -138 0 0 - 5 31 38 20 40 53.8 4 106 85 - 5 42 43 - 5 20 34 - 5 49 45 - 5 13 33 0.28 -137 0 0 - 5 50 45 20 40 54.3 5 106 86 - 6 1 51 - 5 39 40 - 6 8 53 - 5 32 39 0.28 -136 0 0 - 6 10 5 20 40 54.9 6 106 87 - 6 21 12 - 5 59 0 - 6 28 15 - 5 51 58 0.28 -135 0 0 - 6 29 39 20 40 55.6 7 106 88 - 6 40 46 - 6 18 32 - 6 47 49 - 6 11 30 0.28 -134 0 0 - 6 49 24 20 40 56.4 8 106 89 - 7 0 32 - 6 38 17 - 7 7 36 - 6 31 14 0.29 -133 0 0 - 7 9 22 20 40 57.3 10 106 89 - 7 20 31 - 6 58 14 - 7 27 35 - 6 51 11 0.29 -132 0 0 - 7 29 31 20 40 58.3 11 106 88 - 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: G184339.7-163718 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 43 39.7200 DE: -16 37 18.301 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 43 39.7200 DE: -16 37 18.301 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.7 * B mag [mag]: 14.0 * Diameter [mas]: 0.60 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1999) Hirayama asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.014 distance from Earth [AU]: 3.44500 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 date of fit: 2023 Apr 24 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): 0.012", 0.004", 91.309° remarks: * orbital elements for (1999)Hirayama : Mean anomaly = 146.2025167168 deg Arg. of pericenter = 355.9563283102 deg Long. of node = 147.8399971920 deg Inclination = 12.5360188834 deg Eccentricity = 0.1184905249 Semimajor axis = 3.1134001297 AU Perihelion dist = 2.7444917140 AU Mag: H = 11.00, G = 0.15 Epoch of elements : MJD 60595.86515650 TDT (2024 Oct 12.8652) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,1.81,2024,10,12,20.763759,-0.053679,-0.265862,11.447541,-2.292772,0.005780,0.000565,0.000000,0.000000 -52.0989,-16.5973,-134.89,-7.83,False G184339.7-163718,18.72770002,-16.6217501,14.02,11.74,10.51,0.6,4,,18.75144922,-16.5972981,5.52,6.30,0,0,0 1999,Hirayama,17.25,37.393,3.4450,0,0,2.033,-5.85,,1.8,0 0,146.0473,2024,10,12,355.9563,147.8400,12.5360,0.11849,3.11340,2.74449,11.00,5.0,0.15 1.317,0.0120,0.0043,91,0.0048,Known errors,0.95,0,-1,-1 20241012_163718,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org