IOTA/IOTA-ES occultation update for (5339) Desmars / UCAC4 568-008524 event on 2024 Dec 23, 00:44 UT Visible from Summary ------- On 2024 Dec 23 UT, the 16.474 km diameter asteroid (5339) Desmars will occult a 10.2 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 7.14 mag to 17.35 mag (the magnitude of the asteroid) for at most 1.840 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: 98 * date and approx. time of event: 2024 Dec 23, 00:33 - 2024 Dec 23, 00:54 * geocentric midpoint of event [JD]: 2460667.53069867 * magnitude of target star: 10.21 * magnitude drop [mag]: 7.14 * estimated maximum duration [s]: 1.840 * Moon: 48 % sunlit, 123° distance * Sun: 149° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.030, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.003", 77°) * approx speed of asteroid's shadow [km/s]: 8.9674 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 568-008524 by 5339 Desmars on 2024 Dec 23 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 -116 0 0 -41 5 18 0 54 38.7 0 58 24 -40 59 17 .. .. .. -40 54 53 .. .. .. .... -115 0 0 -40 36 49 0 54 38.6 1 57 23 -40 30 47 -40 42 51 -40 26 23 -40 47 16 0.09 -114 0 0 -40 7 58 0 54 38.3 2 57 22 -40 1 56 -40 14 1 -39 57 31 -40 18 27 0.32 -113 0 0 -39 38 46 0 54 37.8 3 56 21 -39 32 43 -39 44 49 -39 28 18 -39 49 15 0.40 -112 0 0 -39 9 13 0 54 37.1 4 56 20 -39 3 10 -39 15 17 -38 58 44 -39 19 43 0.44 -111 0 0 -38 39 20 0 54 36.2 5 55 20 -38 33 16 -38 45 24 -38 28 50 -38 49 51 0.46 -110 0 0 -38 9 7 0 54 35.1 6 54 19 -38 3 3 -38 15 12 -37 58 36 -38 19 39 0.48 -109 0 0 -37 38 35 0 54 33.7 6 54 18 -37 32 31 -37 44 41 -37 28 4 -37 49 8 0.49 -108 0 0 -37 7 46 0 54 32.2 7 53 17 -37 1 41 -37 13 51 -36 57 14 -37 18 19 0.50 -107 0 0 -36 36 39 0 54 30.4 8 52 16 -36 30 34 -36 42 45 -36 26 7 -36 47 13 0.51 -106 0 0 -36 5 16 0 54 28.3 9 52 15 -35 59 10 -36 11 22 -35 54 43 -36 15 50 0.51 -105 0 0 -35 33 37 0 54 26.0 10 51 14 -35 27 31 -35 39 43 -35 23 4 -35 44 11 0.52 -104 0 0 -35 1 43 0 54 23.5 11 51 13 -34 55 37 -35 7 49 -34 51 10 -35 12 17 0.52 -103 0 0 -34 29 35 0 54 20.8 12 50 12 -34 23 29 -34 35 42 -34 19 2 -34 40 10 0.52 -102 0 0 -33 57 15 0 54 17.8 13 50 11 -33 51 9 -34 3 21 -33 46 41 -34 7 49 0.53 -101 0 0 -33 24 42 0 54 14.5 14 49 10 -33 18 36 -33 30 48 -33 14 9 -33 35 17 0.53 -100 0 0 -32 51 58 0 54 11.0 15 48 9 -32 45 53 -32 58 5 -32 41 25 -33 2 33 0.53 - 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2 5 49 0 34 58.8 24 297 -53 - 2 0 35 - 2 11 2 - 1 56 46 - 2 14 52 0.55 20 0 0 - 2 19 42 0 34 53.1 23 297 -52 - 2 14 28 - 2 24 57 - 2 10 39 - 2 28 47 0.56 21 0 0 - 2 34 9 0 34 47.6 22 297 -51 - 2 28 54 - 2 39 24 - 2 25 4 - 2 43 15 0.56 22 0 0 - 2 49 9 0 34 42.3 21 297 -50 - 2 43 53 - 2 54 25 - 2 40 3 - 2 58 16 0.56 23 0 0 - 3 4 42 0 34 37.2 20 296 -49 - 2 59 25 - 3 9 58 - 2 55 34 - 3 13 50 0.56 24 0 0 - 3 20 48 0 34 32.4 19 296 -48 - 3 15 31 - 3 26 5 - 3 11 39 - 3 29 58 0.56 25 0 0 - 3 37 27 0 34 27.7 18 296 -47 - 3 32 9 - 3 42 45 - 3 28 17 - 3 46 38 0.56 26 0 0 - 3 54 40 0 34 23.3 17 296 -46 - 3 49 21 - 3 59 59 - 3 45 28 - 4 3 52 0.56 27 0 0 - 4 12 25 0 34 19.2 16 296 -45 - 4 7 6 - 4 17 45 - 4 3 12 - 4 21 39 0.56 28 0 0 - 4 30 44 0 34 15.2 15 296 -45 - 4 25 23 - 4 36 5 - 4 21 29 - 4 40 0 0.56 29 0 0 - 4 49 35 0 34 11.5 14 296 -44 - 4 44 14 - 4 54 57 - 4 40 19 - 4 58 53 0.56 30 0 0 - 5 9 0 0 34 8.0 13 296 -43 - 5 3 38 - 5 14 23 - 4 59 42 - 5 18 19 0.57 31 0 0 - 5 28 57 0 34 4.8 12 296 -42 - 5 23 34 - 5 34 21 - 5 19 38 - 5 38 18 0.57 32 0 0 - 5 49 28 0 34 1.8 11 295 -41 - 5 44 3 - 5 54 52 - 5 40 6 - 5 58 50 0.57 33 0 0 - 6 10 30 0 33 59.1 10 295 -40 - 6 5 5 - 6 15 56 - 6 1 7 - 6 19 54 0.57 34 0 0 - 6 32 5 0 33 56.6 9 295 -39 - 6 26 39 - 6 37 32 - 6 22 40 - 6 41 31 0.57 35 0 0 - 6 54 13 0 33 54.4 8 295 -38 - 6 48 45 - 6 59 41 - 6 44 46 - 7 3 41 0.58 36 0 0 - 7 16 52 0 33 52.4 7 295 -37 - 7 11 24 - 7 22 21 - 7 7 24 - 7 26 22 0.58 37 0 0 - 7 40 4 0 33 50.7 6 295 -36 - 7 34 34 - 7 45 34 - 7 30 33 - 7 49 36 0.58 38 0 0 - 8 3 47 0 33 49.3 5 295 -35 - 7 58 16 - 8 9 18 - 7 54 15 - 8 13 21 0.59 39 0 0 - 8 28 2 0 33 48.1 4 294 -34 - 8 22 30 - 8 33 34 - 8 18 27 - 8 37 37 0.60 40 0 0 - 8 52 48 0 33 47.2 3 294 -33 - 8 47 15 - 8 58 21 - 8 43 11 - 9 2 25 0.61 41 0 0 - 9 18 5 0 33 46.6 2 294 -31 - 9 12 30 - 9 23 39 - 9 8 26 - 9 27 44 0.64 42 0 0 - 9 43 52 0 33 46.3 1 294 -30 - 9 38 16 - 9 49 27 - 9 34 11 - 9 53 33 0.77 Uncertainty in time = +/- 5 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: UCAC4 568-008524 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 48 34.5455 DE: +23 26 04.123 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 48 34.5452 DE: +23 26 04.123 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.2 * B mag [mag]: 10.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5339) Desmars asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.17920 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#47 date of fit: 2023 Feb 10 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", 0.003", 76.762° remarks: * orbital elements for (5339)Desmars : Mean anomaly = 306.7834200166 deg Arg. of pericenter = 153.8457072570 deg Long. of node = 336.1734698387 deg Inclination = 2.3809604702 deg Eccentricity = 0.0734585181 Semimajor axis = 3.1905751777 AU Perihelion dist = 2.9562002534 AU Mag: H = 12.61, G = 0.15 Epoch of elements : MJD 60667.03069904 TDT (2024 Dec 23.0307) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Feb10,1.84,2024,12,23,0.736768,0.141649,-0.450808,-4.831318,-1.508840,0.003089,0.000368,0.000001,0.000000 -45.5911,23.5128,168.72,-23.43,False UCAC4 568-008524,3.80959599,23.4344787,10.52,10.21,10.04,0.0,4,,3.83461842,23.5127555,7.15,6.86,0,0,0 5339,Desmars,17.35,16.474,2.1792,0,0,-1.417,-6.09,,1.6,0 0,306.6052,2024,12,22,153.8457,336.1735,2.3810,0.07346,3.19058,2.95620,12.60,5.0,0.15 1.366,0.0303,0.0032,77,0.0038,Known errors,0.96,0,-1,-1 20241223_008524,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org