IOTA/IOTA-ES occultation update for (2781) Kleczek / UCAC4 379-067972 event on 2024 Dec 25, 01:38 UT Visible from Summary ------- On 2024 Dec 25 UT, the 19.912 km diameter asteroid (2781) Kleczek will occult a 10.9 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.87 mag to 18.76 mag (the magnitude of the asteroid) for at most 0.600 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 25, 01:35 - 2024 Dec 25, 01:42 * geocentric midpoint of event [JD]: 2460669.56872396 * magnitude of target star: 10.89 * magnitude drop [mag]: 7.87 * estimated maximum duration [s]: 0.600 * Moon: 30 % sunlit, 17° distance * Sun: 49° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.38 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.002", 102°) * approx speed of asteroid's shadow [km/s]: 33.4143 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 379-067972 by 2781 Kleczek on 2024 Dec 25 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 18 0 0 12 32 38 1 35 47.3 0 105 -49 12 27 3 12 38 14 12 22 49 12 42 27 .... 19 0 0 12 16 52 1 35 47.3 1 105 -48 12 11 16 12 22 28 12 7 3 12 26 42 0.11 20 0 0 12 0 48 1 35 47.4 2 105 -47 11 55 12 12 6 25 11 50 58 12 10 39 0.08 21 0 0 11 44 26 1 35 47.6 3 105 -46 11 38 49 11 50 3 11 34 35 11 54 17 0.07 22 0 0 11 27 46 1 35 47.8 4 106 -45 11 22 9 11 33 23 11 17 54 11 37 38 0.07 23 0 0 11 10 49 1 35 48.1 5 106 -44 11 5 11 11 16 26 11 0 56 11 20 41 0.06 24 0 0 10 53 33 1 35 48.4 6 106 -43 10 47 55 10 59 12 10 43 40 11 3 27 0.06 25 0 0 10 36 1 1 35 48.8 7 106 -42 10 30 23 10 41 40 10 26 7 10 45 55 0.06 26 0 0 10 18 12 1 35 49.3 8 106 -41 10 12 33 10 23 51 10 8 17 10 28 7 0.06 27 0 0 10 0 6 1 35 49.8 9 107 -40 9 54 27 10 5 46 9 50 11 10 10 2 0.06 28 0 0 9 41 44 1 35 50.4 10 107 -39 9 36 5 9 47 24 9 31 48 9 51 41 0.06 29 0 0 9 23 6 1 35 51.0 11 107 -38 9 17 26 9 28 46 9 13 9 9 33 3 0.06 30 0 0 9 4 12 1 35 51.7 12 107 -37 8 58 32 9 9 53 8 54 15 9 14 10 0.06 31 0 0 8 45 3 1 35 52.5 13 107 -36 8 39 22 8 50 44 8 35 5 8 55 1 0.06 32 0 0 8 25 39 1 35 53.3 14 107 -34 8 19 57 8 31 20 8 15 39 8 35 38 0.06 33 0 0 8 5 59 1 35 54.2 16 108 -33 8 0 18 8 11 41 7 56 0 8 15 59 0.06 34 0 0 7 46 6 1 35 55.2 17 108 -32 7 40 24 7 51 48 7 36 5 7 56 6 0.05 35 0 0 7 25 58 1 35 56.2 18 108 -31 7 20 16 7 31 41 7 15 57 7 35 59 0.05 36 0 0 7 5 37 1 35 57.3 19 108 -30 6 59 54 7 11 20 6 55 35 7 15 38 0.05 37 0 0 6 45 2 1 35 58.5 20 108 -29 6 39 19 6 50 45 6 35 0 6 55 4 0.05 38 0 0 6 24 15 1 35 59.7 21 108 -28 6 18 31 6 29 58 6 14 11 6 34 18 0.05 39 0 0 6 3 14 1 36 1.0 22 108 -27 5 57 31 6 8 58 5 53 11 6 13 18 0.05 40 0 0 5 42 2 1 36 2.3 23 108 -26 5 36 18 5 47 47 5 31 58 5 52 7 0.05 41 0 0 5 20 39 1 36 3.7 24 108 -25 5 14 54 5 26 23 5 10 34 5 30 43 0.05 42 0 0 4 59 4 1 36 5.2 25 108 -24 4 53 19 5 4 49 4 48 58 5 9 9 0.05 43 0 0 4 37 18 1 36 6.7 26 109 -23 4 31 33 4 43 3 4 27 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0.05 -179 0 0 -21 16 9 1 42 1.0 16 260 65 -21 21 38 -21 10 39 -21 25 47 -21 6 31 0.05 -178 0 0 -21 5 41 1 42 1.8 15 260 64 -21 11 11 -21 0 11 -21 15 20 -20 56 2 0.05 -177 0 0 -20 54 54 1 42 2.6 14 260 63 -21 0 24 -20 49 23 -21 4 33 -20 45 14 0.05 -176 0 0 -20 43 46 1 42 3.4 13 259 63 -20 49 17 -20 38 16 -20 53 26 -20 34 6 0.05 -175 0 0 -20 32 19 1 42 4.1 12 259 62 -20 37 50 -20 26 48 -20 42 0 -20 22 38 0.06 -174 0 0 -20 20 32 1 42 4.8 11 259 61 -20 26 3 -20 15 1 -20 30 14 -20 10 51 0.06 -173 0 0 -20 8 26 1 42 5.4 10 258 60 -20 13 57 -20 2 54 -20 18 8 -19 58 44 0.06 -172 0 0 -19 56 0 1 42 5.9 9 258 59 -20 1 32 -19 50 28 -20 5 43 -19 46 17 0.06 -171 0 0 -19 43 15 1 42 6.4 9 258 58 -19 48 47 -19 37 42 -19 52 58 -19 33 31 0.06 -170 0 0 -19 30 10 1 42 6.9 8 257 57 -19 35 43 -19 24 37 -19 39 55 -19 20 26 0.06 -169 0 0 -19 16 47 1 42 7.3 7 257 56 -19 22 20 -19 11 14 -19 26 32 -19 7 2 0.06 -168 0 0 -19 3 5 1 42 7.6 6 257 55 -19 8 38 -18 57 31 -19 12 50 -18 53 19 0.07 -167 0 0 -18 49 3 1 42 7.9 5 256 54 -18 54 38 -18 43 29 -18 58 50 -18 39 17 0.07 -166 0 0 -18 34 44 1 42 8.2 4 256 53 -18 40 18 -18 29 9 -18 44 31 -18 24 57 0.08 -165 0 0 -18 20 6 1 42 8.4 3 256 52 -18 25 41 -18 14 31 -18 29 54 -18 10 18 0.09 -164 0 0 -18 5 9 1 42 8.5 2 255 51 -18 10 45 -17 59 34 -18 14 58 -17 55 21 0.12 -163 0 0 -17 49 55 1 42 8.6 1 255 50 -17 55 31 -17 44 19 -17 59 44 -17 40 6 0.21 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: UCAC4 379-067972 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 49 17.3430 DE: -14 21 04.412 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 49 17.3433 DE: -14 21 04.413 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.9 * B mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2781) Kleczek asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.006 distance from Earth [AU]: 4.27100 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 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): 0.010", 0.002", 102.222° remarks: * orbital elements for (2781)Kleczek : Mean anomaly = 165.3036596176 deg Arg. of pericenter = 256.4645849020 deg Long. of node = 146.6297148118 deg Inclination = 2.3176092309 deg Eccentricity = 0.1775646919 Semimajor axis = 3.1567893094 AU Perihelion dist = 2.5962549882 AU Mag: H = 12.06, G = 0.15 Epoch of elements : MJD 60669.06872388 TDT (2024 Dec 25.0687) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr24,0.60,2024,12,25,1.649375,-0.013169,-0.043665,18.172990,-5.043812,-0.004376,0.001476,-0.000001,0.000000 103.8539,-14.4544,155.28,-23.39,False UCAC4 379-067972,14.82148413,-14.3512254,11.23,10.89,10.71,0.0,0,,14.84413924,-14.4543704,7.87,7.60,0,0,0 2781,Kleczek,18.76,19.912,4.2710,0,0,2.577,-10.39,,2.0,0 0,165.1159,2024,12,24,256.4646,146.6297,2.3176,0.17756,3.15679,2.59625,12.05,5.0,0.15 1.378,0.0103,0.0024,102,0.0024,Known errors,0.93,0,-1,-1 20241225_067972,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org