IOTA/IOTA-ES occultation update for (279) Thule / UCAC4-561-010668 event on 2022 Dec 13, 23:13 UT Visible from Africa, South America Summary ------- On 2022 Dec 13 UT, the 126.3 km diameter asteroid (279) Thule will occult a 12.4 mag star in the constellation Taurus for observers along a path across Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.13 mag to 14.37 mag (the magnitude of the asteroid) for at most 8.600 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: 100 * date and approx. time of event: 2022 Dec 13, 23:06 - 2022 Dec 13, 23:20 * geocentric midpoint of event [JD]: 2459927.46752779 * magnitude of target star: 12.40 * magnitude drop [mag]: 2.13 * estimated maximum duration [s]: 8.600 * Moon: 72 % sunlit, 75° distance * Sun: 169° distance * rough path description: Africa, South America The occultation path -------------------- * approximate projected width [km]: 137 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.004", 84°) * approx speed of asteroid's shadow [km/s]: 14.6888 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-561-010668 by 279 Thule on 2022 Dec 13 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 - 81 0 0 -26 38 14 23 19 53.0 1 65 10 -25 57 2 -27 19 40 -25 50 39 -27 26 8 .... - 80 0 0 -26 13 3 23 19 52.8 2 64 9 -25 31 52 -26 54 30 -25 25 28 -27 0 58 0.20 - 79 0 0 -25 47 48 23 19 52.6 3 64 8 -25 6 36 -26 29 14 -25 0 12 -26 35 42 0.29 - 78 0 0 -25 22 27 23 19 52.1 4 63 7 -24 41 15 -26 3 53 -24 34 52 -26 10 21 0.34 - 77 0 0 -24 57 2 23 19 51.5 5 63 6 -24 15 51 -25 38 28 -24 9 27 -25 44 56 0.36 - 76 0 0 -24 31 34 23 19 50.8 6 63 5 -23 50 23 -25 12 59 -23 43 59 -25 19 27 0.37 - 75 0 0 -24 6 2 23 19 50.0 7 62 4 -23 24 52 -24 47 27 -23 18 29 -24 53 55 0.38 - 74 0 0 -23 40 29 23 19 49.0 8 62 3 -22 59 19 -24 21 52 -22 52 56 -24 28 20 0.39 - 73 0 0 -23 14 53 23 19 47.8 9 61 2 -22 33 45 -23 56 16 -22 27 22 -24 2 44 0.40 - 72 0 0 -22 49 17 23 19 46.5 10 61 1 -22 8 10 -23 30 39 -22 1 47 -23 37 6 0.40 - 71 0 0 -22 23 41 23 19 45.0 11 61 0 -21 42 35 -23 5 1 -21 36 12 -23 11 28 0.41 - 70 0 0 -21 58 4 23 19 43.4 12 60 -1 -21 17 0 -22 39 23 -21 10 38 -22 45 50 0.41 - 69 0 0 -21 32 29 23 19 41.7 13 60 -2 -20 51 26 -22 13 47 -20 45 5 -22 20 13 0.41 - 68 0 0 -21 6 56 23 19 39.8 14 59 -3 -20 25 55 -21 48 11 -20 19 33 -21 54 38 0.42 - 67 0 0 -20 41 25 23 19 37.7 15 59 -4 -20 0 26 -21 22 39 -19 54 5 -21 29 5 0.42 - 66 0 0 -20 15 57 23 19 35.6 16 59 -5 -19 35 0 -20 57 9 -19 28 39 -21 3 34 0.42 - 65 0 0 -19 50 33 23 19 33.2 17 58 -6 -19 9 38 -20 31 42 -19 3 18 -20 38 8 0.42 - 64 0 0 -19 25 14 23 19 30.7 18 58 -7 -18 44 21 -20 6 20 -18 38 1 -20 12 46 0.42 - 63 0 0 -18 59 59 23 19 28.1 19 58 -8 -18 19 9 -19 41 3 -18 12 49 -19 47 28 0.42 - 62 0 0 -18 34 50 23 19 25.3 20 57 -9 -17 54 3 -19 15 52 -17 47 43 -19 22 16 0.42 - 61 0 0 -18 9 47 23 19 22.4 21 57 -10 -17 29 3 -18 50 46 -17 22 43 -18 57 10 0.42 - 60 0 0 -17 44 51 23 19 19.4 22 56 -11 -17 4 10 -18 25 47 -16 57 51 -18 32 11 0.43 - 59 0 0 -17 20 3 23 19 16.1 23 56 -12 -16 39 24 -18 0 56 -16 33 6 -18 7 19 0.43 - 58 0 0 -16 55 23 23 19 12.8 24 56 -13 -16 14 47 -17 36 13 -16 8 29 -17 42 35 0.43 - 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1 5 49 0 14 35 - 1 11 39 0.43 18 0 0 - 0 30 1 23 11 8.0 61 322 -65 0 7 13 - 1 7 26 0 12 59 - 1 13 16 0.43 19 0 0 - 0 32 3 23 11 1.1 60 320 -65 0 5 12 - 1 9 28 0 10 59 - 1 15 18 0.43 20 0 0 - 0 34 30 23 10 54.1 59 319 -65 0 2 46 - 1 11 56 0 8 33 - 1 17 46 0.43 21 0 0 - 0 37 22 23 10 47.3 59 318 -64 - 0 0 5 - 1 14 48 0 5 42 - 1 20 39 0.43 22 0 0 - 0 40 39 23 10 40.4 58 317 -64 - 0 3 22 - 1 18 6 0 2 26 - 1 23 57 0.43 23 0 0 - 0 44 21 23 10 33.7 57 316 -63 - 0 7 3 - 1 21 50 - 0 1 15 - 1 27 41 0.43 24 0 0 - 0 48 28 23 10 26.9 56 315 -63 - 0 11 9 - 1 25 58 - 0 5 21 - 1 31 49 0.43 25 0 0 - 0 53 1 23 10 20.3 56 314 -62 - 0 15 40 - 1 30 32 - 0 9 52 - 1 36 23 0.43 26 0 0 - 0 57 58 23 10 13.6 55 313 -62 - 0 20 36 - 1 35 31 - 0 14 48 - 1 41 22 0.43 27 0 0 - 1 3 21 23 10 7.1 54 312 -61 - 0 25 57 - 1 40 55 - 0 20 9 - 1 46 47 0.43 28 0 0 - 1 9 9 23 10 0.6 53 311 -61 - 0 31 43 - 1 46 44 - 0 25 55 - 1 52 36 0.43 29 0 0 - 1 15 21 23 9 54.1 53 310 -60 - 0 37 54 - 1 52 59 - 0 32 6 - 1 58 51 0.43 30 0 0 - 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6 47 57 0.44 55 0 0 - 6 19 35 23 7 35.0 29 300 -38 - 5 40 50 - 6 58 32 - 5 34 50 - 7 4 37 0.44 56 0 0 - 6 36 32 23 7 31.0 28 299 -37 - 5 57 44 - 7 15 33 - 5 51 42 - 7 21 39 0.44 57 0 0 - 6 53 51 23 7 27.1 27 299 -37 - 6 14 58 - 7 32 56 - 6 8 57 - 7 39 2 0.44 58 0 0 - 7 11 32 23 7 23.4 26 299 -36 - 6 32 35 - 7 50 41 - 6 26 32 - 7 56 47 0.44 59 0 0 - 7 29 34 23 7 19.8 25 299 -35 - 6 50 32 - 8 8 47 - 6 44 29 - 8 14 54 0.44 60 0 0 - 7 47 56 23 7 16.3 24 298 -34 - 7 8 51 - 8 27 14 - 7 2 47 - 8 33 22 0.44 61 0 0 - 8 6 40 23 7 12.9 23 298 -33 - 7 27 30 - 8 46 1 - 7 21 26 - 8 52 10 0.44 62 0 0 - 8 25 43 23 7 9.7 22 298 -32 - 7 46 30 - 9 5 9 - 7 40 25 - 9 11 18 0.44 63 0 0 - 8 45 7 23 7 6.6 21 298 -31 - 8 5 49 - 9 24 37 - 7 59 43 - 9 30 47 0.44 64 0 0 - 9 4 50 23 7 3.7 20 298 -30 - 8 25 28 - 9 44 25 - 8 19 22 - 9 50 36 0.44 65 0 0 - 9 24 53 23 7 0.9 19 297 -29 - 8 45 27 -10 4 32 - 8 39 20 -10 10 43 0.45 66 0 0 - 9 45 15 23 6 58.2 18 297 -28 - 9 5 45 -10 24 58 - 8 59 37 -10 31 10 0.45 67 0 0 -10 5 56 23 6 55.7 17 297 -27 - 9 26 21 -10 45 43 - 9 20 13 -10 51 56 0.45 68 0 0 -10 26 55 23 6 53.3 16 297 -26 - 9 47 16 -11 6 46 - 9 41 7 -11 13 0 0.45 69 0 0 -10 48 11 23 6 51.1 15 296 -25 -10 8 28 -11 28 7 -10 2 19 -11 34 21 0.45 70 0 0 -11 9 46 23 6 49.0 14 296 -24 -10 29 58 -11 49 46 -10 23 48 -11 56 1 0.45 71 0 0 -11 31 37 23 6 47.0 13 296 -23 -10 51 45 -12 11 42 -10 45 35 -12 17 57 0.45 72 0 0 -11 53 45 23 6 45.2 12 296 -22 -11 13 49 -12 33 54 -11 7 38 -12 40 10 0.45 73 0 0 -12 16 9 23 6 43.6 11 296 -21 -11 36 9 -12 56 22 -11 29 57 -13 2 38 0.45 74 0 0 -12 38 49 23 6 42.1 10 295 -20 -11 58 45 -13 19 6 -11 52 32 -13 25 23 0.45 75 0 0 -13 1 44 23 6 40.8 8 295 -19 -12 21 36 -13 42 5 -12 15 22 -13 48 23 0.45 76 0 0 -13 24 53 23 6 39.6 7 295 -17 -12 44 41 -14 5 18 -12 38 27 -14 11 37 0.45 77 0 0 -13 48 17 23 6 38.5 6 295 -16 -13 8 1 -14 28 46 -13 1 47 -14 35 5 0.46 78 0 0 -14 11 54 23 6 37.7 5 294 -15 -13 31 35 -14 52 27 -13 25 20 -14 58 47 0.46 79 0 0 -14 35 45 23 6 36.9 4 294 -14 -13 55 22 -15 16 22 -13 49 6 -15 22 42 0.46 80 0 0 -14 59 48 23 6 36.4 3 294 -13 -14 19 21 -15 40 29 -14 13 5 -15 46 50 0.47 81 0 0 -15 24 3 23 6 36.0 2 294 -12 -14 43 32 -16 4 47 -14 37 16 -16 11 9 0.48 82 0 0 -15 48 30 23 6 35.7 1 293 -11 -15 7 55 -16 29 17 -15 1 38 -16 35 39 0.51 83 0 0 -16 13 7 23 6 35.6 0 293 -10 -15 32 29 .. .. .. -15 26 11 .. .. .. 1.00 Uncertainty in time = +/- 2 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4-561-010668 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 35 18.0607 DE: +22 04 49.549 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 35 18.0607 DE: +22 04 49.549 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (279) Thule asteroid class: approx. diameter [km]: 126 approx. diameter ["]: 0.056 distance from Earth [AU]: 3.12470 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#71 date of fit: 2022 Nov 22 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): 0.014", 0.004", 84.455° remarks: * orbital elements for (279)Thule : Mean anomaly = 336.0676224127 deg Arg. of pericenter = 27.3128970288 deg Long. of node = 71.8786896860 deg Inclination = 2.3348244859 deg Eccentricity = 0.0438341273 Semimajor axis = 4.2643182424 AU Perihelion dist = 4.0773955736 AU Mag: H = 8.52, G = 0.15 Epoch of elements : MJD 59926.96750000 TDT (2022 Dec 13.9675) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#712022Nov22,8.60,2022,12,13,23.220667,0.039733,-0.392962,-8.248731,-0.833819,0.001147,0.000154,0.000002,0.000000 -1.7546,22.1282,-169.72,-23.19,False UCAC4-561-010668,4.58835019,22.0804302,0.00,12.40,0.00,0.0,0,,4.61134406,22.1282362,2.13,0.00,0,0,0 279,Thule,14.37,126.3,3.1247,0,0,-1.670,-2.34,,9.0,0 0,335.9593,2022,12,13,27.3129,71.8787,2.3348,0.04383,4.26432,4.07740,8.55,5.0,0.15 1.078,0.0137,0.0043,84,0.0043,Known errors,-1.00,-1,-1,-1 20221213_010668,59914.08 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org