IOTA/IOTA-ES occultation update for (928) Hildrun / TYC 81-00561-1 event on 2024 Jul 11, 08:37 UT Visible from Summary ------- On 2024 Jul 11 UT, the 63.264 km diameter asteroid (928) Hildrun will occult a 11.8 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.39 mag to 16.17 mag (the magnitude of the asteroid) for at most 1.680 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 Jul 11, 08:34 - 2024 Jul 11, 08:39 * geocentric midpoint of event [JD]: 2460502.85908804 * magnitude of target star: 11.80 * magnitude drop [mag]: 4.39 * estimated maximum duration [s]: 1.680 * Moon: 27 % sunlit, 107° distance * Sun: 46° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.001", 74°) * approx speed of asteroid's shadow [km/s]: 37.6520 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 81-00561-1 by 928 Hildrun on 2024 Jul 11 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 - 78 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -31 1 29 .. .. .. -30 56 53 .... - 77 0 0 -31 13 14 8 34 33.6 1 81 -44 -31 32 35 -30 53 56 -31 37 12 -30 49 20 .... - 76 0 0 -31 5 36 8 34 33.6 2 81 -44 -31 24 57 -30 46 18 -31 29 35 -30 41 42 0.33 - 75 0 0 -30 57 52 8 34 33.7 3 80 -43 -31 17 14 -30 38 34 -31 21 52 -30 33 58 0.39 - 74 0 0 -30 50 4 8 34 33.9 3 80 -42 -31 9 25 -30 30 45 -31 14 3 -30 26 9 0.41 - 73 0 0 -30 42 10 8 34 34.1 4 79 -41 -31 1 32 -30 22 51 -31 6 10 -30 18 15 0.43 - 72 0 0 -30 34 11 8 34 34.3 5 79 -40 -30 53 33 -30 14 52 -30 58 11 -30 10 16 0.44 - 71 0 0 -30 26 7 8 34 34.6 6 78 -39 -30 45 30 -30 6 48 -30 50 8 -30 2 12 0.45 - 70 0 0 -30 17 59 8 34 34.9 7 78 -38 -30 37 22 -29 58 39 -30 42 0 -29 54 3 0.45 - 69 0 0 -30 9 46 8 34 35.3 8 77 -38 -30 29 9 -29 50 26 -30 33 47 -29 45 50 0.46 - 68 0 0 -30 1 28 8 34 35.7 9 77 -37 -30 20 52 -29 42 8 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= +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 81-00561-1 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 23 03.1661 DE: +07 00 32.608 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 23 03.1663 DE: +07 00 32.609 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.8 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (928) Hildrun asteroid class: approx. diameter [km]: 63 approx. diameter ["]: 0.023 distance from Earth [AU]: 3.77820 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 date of fit: 2023 Apr 27 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): 0.013", 0.001", 74.493° remarks: * orbital elements for (928)Hildrun : Mean anomaly = 276.6108044200 deg Arg. of pericenter = 21.3668143901 deg Long. of node = 129.6793271617 deg Inclination = 17.6272629419 deg Eccentricity = 0.1451573853 Semimajor axis = 3.1427067186 AU Perihelion dist = 2.6865196286 AU Mag: H = 10.01, G = 0.15 Epoch of elements : MJD 60502.35908862 TDT (2024 Jul 11.3591) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr27,1.68,2024,7,11,8.618113,0.039365,-0.441482,21.167539,1.890993,-0.003727,-0.001646,-0.000001,0.000000 7.0659,7.0671,52.13,22.01,False TYC 81-00561-1,4.38421278,7.0090575,12.13,11.80,11.62,0.0,0,,4.40586250,7.0671208,4.39,4.12,0,0,0 928,Hildrun,16.17,63.264,3.7782,0,0,3.310,4.40,,3.2,0 0,276.5473,2024,7,11,21.3668,129.6793,17.6273,0.14516,3.14271,2.68652,10.01,5.0,0.15 1.119,0.0130,0.0015,74,0.0028,Known errors,0.96,0,-1,-1 20240711_0561-1,60140.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org