IOTA/IOTA-ES occultation update for (684) Hildburg / UCAC4 597-039432 event on 2024 Dec 24, 00:01 UT Visible from Summary ------- On 2024 Dec 24 UT, the 17.441 km diameter asteroid (684) Hildburg will occult a 11.9 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.63 mag to 14.38 mag (the magnitude of the asteroid) for at most 1.620 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: 97 * date and approx. time of event: 2024 Dec 23, 23:53 - 2024 Dec 24, 00:08 * geocentric midpoint of event [JD]: 2460668.50078463 * magnitude of target star: 11.85 * magnitude drop [mag]: 2.63 * estimated maximum duration [s]: 1.620 * Moon: 39 % sunlit, 86° distance * Sun: 162° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.029, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.005", 102°) * approx speed of asteroid's shadow [km/s]: 10.7982 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 597-039432 by 684 Hildburg on 2024 Dec 24 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 - 57 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -27 20 18 .. .. .. .... - 56 0 0 -26 58 9 0 8 46.9 1 56 -18 -26 50 48 -27 5 30 -26 45 8 -27 11 12 .... - 55 0 0 -26 23 19 0 8 46.5 2 56 -19 -26 16 0 -26 30 38 -26 10 22 -26 36 18 0.51 - 54 0 0 -25 48 54 0 8 45.9 3 55 -20 -25 41 38 -25 56 12 -25 36 2 -26 1 50 0.62 - 53 0 0 -25 14 56 0 8 45.0 4 55 -21 -25 7 42 -25 22 11 -25 2 8 -25 27 48 0.68 - 52 0 0 -24 41 25 0 8 43.9 5 54 -22 -24 34 13 -24 48 38 -24 28 40 -24 54 12 0.71 - 51 0 0 -24 8 22 0 8 42.5 6 54 -23 -24 1 12 -24 15 32 -23 55 41 -24 21 5 0.73 - 50 0 0 -23 35 48 0 8 40.8 7 54 -24 -23 28 40 -23 42 56 -23 23 11 -23 48 27 0.74 - 49 0 0 -23 3 43 0 8 38.9 8 53 -25 -22 56 37 -23 10 49 -22 51 10 -23 16 19 0.76 - 48 0 0 -22 32 9 0 8 36.8 9 53 -26 -22 25 5 -22 39 13 -22 19 39 -22 44 40 0.76 - 47 0 0 -22 1 5 0 8 34.4 10 52 -27 -21 54 4 -22 8 7 -21 48 40 -22 13 33 0.77 - 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3 311 5 -37 1 40 -37 17 22 -36 55 38 -37 23 27 0.89 81 0 0 -37 47 31 23 53 29.5 - 2 310 6 -37 39 39 -37 55 24 -37 33 35 -38 1 30 0.92 82 0 0 -38 25 31 23 53 29.2 - 1 310 7 -38 17 37 -38 33 26 -38 11 33 -38 39 33 0.99 83 0 0 -39 3 29 23 53 29.1 - 0 309 8 -38 55 34 -39 11 25 -38 49 28 .. .. .. 2.65 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: UCAC4 597-039432 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 24 04.1735 DE: +29 20 17.426 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 24 04.1735 DE: +29 20 17.427 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (684) Hildburg asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.015 distance from Earth [AU]: 1.56010 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#62 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): 0.030", 0.005", 102.356° remarks: * orbital elements for (684)Hildburg : Mean anomaly = 193.2011929495 deg Arg. of pericenter = 293.4675261878 deg Long. of node = 336.2241527652 deg Inclination = 5.5194930134 deg Eccentricity = 0.0348014419 Semimajor axis = 2.4328579007 AU Perihelion dist = 2.3481909378 AU Mag: H = 10.91, G = 0.15 Epoch of elements : MJD 60668.00078463 TDT (2024 Dec 24.0008) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#622023Apr24,1.62,2024,12,24,0.018831,-0.077966,-0.623049,-6.047625,0.756980,-0.001735,-0.000458,0.000001,0.000000 18.1193,29.2891,179.61,-23.41,False UCAC4 597-039432,7.40115929,29.3381740,12.45,11.85,11.53,0.0,0,,7.42778730,29.2890991,2.63,2.51,0,0,0 684,Hildburg,14.38,17.441,1.5601,0,0,-2.606,4.26,,1.0,0 0,192.9413,2024,12,23,293.4675,336.2242,5.5195,0.03480,2.43286,2.34819,10.90,5.0,0.15 1.386,0.0297,0.0053,102,0.0060,Known errors,0.97,0,-1,-1 20241224_039432,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org