IOTA/IOTA-ES occultation update for (732) Tjilaki / UCAC4 390-073820 event on 2024 Sep 17, 19:20 UT Visible from Summary ------- On 2024 Sep 17 UT, the 33.1366263274841 km diameter asteroid (732) Tjilaki will occult a 11.2 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.16 mag to 15.36 mag (the magnitude of the asteroid) for at most 1.500 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 Sep 17, 19:15 - 2024 Sep 17, 19:25 * geocentric midpoint of event [JD]: 2460571.30585813 * magnitude of target star: 11.22 * magnitude drop [mag]: 4.16 * estimated maximum duration [s]: 1.500 * Moon: 100 % sunlit, 93° distance * Sun: 84° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 33 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.003", 95°) * approx speed of asteroid's shadow [km/s]: 22.3122 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 390-073820 by 732 Tjilaki on 2024 Sep 17 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 -113 0 0 15 5 53 19 15 40.7 1 103 77 14 56 34 15 15 12 14 52 28 15 19 18 .... -112 0 0 14 52 26 19 15 40.8 2 103 77 14 43 6 15 1 46 14 39 0 15 5 52 0.09 -111 0 0 14 38 38 19 15 41.0 3 103 77 14 29 18 14 47 59 14 25 12 14 52 5 0.07 -110 0 0 14 24 31 19 15 41.2 4 104 77 14 15 9 14 33 52 14 11 3 14 37 58 0.07 -109 0 0 14 10 2 19 15 41.6 5 104 78 14 0 41 14 19 24 13 56 33 14 23 31 0.06 -108 0 0 13 55 14 19 15 42.0 6 104 78 13 45 52 14 4 37 13 41 44 14 8 44 0.06 -107 0 0 13 40 6 19 15 42.6 7 104 78 13 30 43 13 49 29 13 26 35 13 53 37 0.06 -106 0 0 13 24 38 19 15 43.2 8 105 78 13 15 14 13 34 2 13 11 6 13 38 10 0.06 -105 0 0 13 8 51 19 15 43.9 9 105 78 12 59 26 13 18 16 12 55 18 13 22 24 0.06 -104 0 0 12 52 44 19 15 44.7 10 105 77 12 43 18 13 2 10 12 39 10 13 6 18 0.06 -103 0 0 12 36 18 19 15 45.6 11 105 77 12 26 52 12 45 44 12 22 43 12 49 53 0.06 -102 0 0 12 19 33 19 15 46.5 12 105 77 12 10 6 12 29 0 12 5 56 12 33 9 0.06 -101 0 0 12 2 29 19 15 47.6 13 106 76 11 53 1 12 11 57 11 48 51 12 16 7 0.06 -100 0 0 11 45 6 19 15 48.8 14 106 76 11 35 38 11 54 35 11 31 28 11 58 45 0.06 - 99 0 0 11 27 26 19 15 50.0 15 106 75 11 17 56 11 36 55 11 13 46 11 41 5 0.06 - 98 0 0 11 9 27 19 15 51.4 16 106 75 10 59 56 11 18 57 10 55 46 11 23 7 0.05 - 97 0 0 10 51 10 19 15 52.8 17 106 74 10 41 39 11 0 41 10 37 28 11 4 52 0.05 - 96 0 0 10 32 35 19 15 54.3 18 107 73 10 23 3 10 42 7 10 18 52 10 46 18 0.05 - 95 0 0 10 13 43 19 15 56.0 19 107 73 10 4 11 10 23 16 9 59 59 10 27 27 0.05 - 94 0 0 9 54 34 19 15 57.7 20 107 72 9 45 1 10 4 8 9 40 49 10 8 20 0.05 - 93 0 0 9 35 9 19 15 59.5 21 107 71 9 25 35 9 44 43 9 21 22 9 48 55 0.05 - 92 0 0 9 15 27 19 16 1.4 22 107 70 9 5 52 9 25 1 9 1 39 9 29 14 0.05 - 91 0 0 8 55 29 19 16 3.4 23 107 69 8 45 53 9 5 4 8 41 40 9 9 17 0.05 - 90 0 0 8 35 15 19 16 5.5 24 108 69 8 25 39 8 44 51 8 21 25 8 49 4 0.05 - 89 0 0 8 14 46 19 16 7.7 25 108 68 8 5 9 8 24 22 8 0 55 8 28 36 0.05 - 88 0 0 7 54 1 19 16 10.0 26 108 67 7 44 24 8 3 39 7 40 10 8 7 53 0.05 - 87 0 0 7 33 2 19 16 12.4 27 108 66 7 23 24 7 42 41 7 19 10 7 46 55 0.05 - 86 0 0 7 11 49 19 16 14.8 28 108 65 7 2 10 7 21 28 6 57 56 7 25 43 0.05 - 85 0 0 6 50 22 19 16 17.4 29 108 64 6 40 43 7 0 2 6 36 28 7 4 17 0.05 - 84 0 0 6 28 42 19 16 20.0 30 108 63 6 19 2 6 38 22 6 14 47 6 42 37 0.05 - 83 0 0 6 6 49 19 16 22.8 31 108 62 5 57 8 6 16 29 5 52 52 6 20 45 0.05 - 82 0 0 5 44 43 19 16 25.6 33 108 61 5 35 1 5 54 24 5 30 46 5 58 40 0.05 - 81 0 0 5 22 25 19 16 28.5 34 109 60 5 12 43 5 32 7 5 8 27 5 36 23 0.05 - 80 0 0 4 59 55 19 16 31.6 35 109 59 4 50 13 5 9 38 4 45 56 5 13 54 0.05 - 79 0 0 4 37 15 19 16 34.7 36 109 58 4 27 32 4 46 58 4 23 15 4 51 14 0.05 - 78 0 0 4 14 23 19 16 37.9 37 109 57 4 4 40 4 24 7 4 0 23 4 28 24 0.05 - 77 0 0 3 51 22 19 16 41.1 38 109 56 3 41 38 4 1 6 3 37 21 4 5 23 0.05 - 76 0 0 3 28 11 19 16 44.5 39 109 55 3 18 26 3 37 56 3 14 9 3 42 13 0.05 - 75 0 0 3 4 51 19 16 47.9 40 109 54 2 55 6 3 14 36 2 50 49 3 18 53 0.05 - 74 0 0 2 41 22 19 16 51.5 41 109 53 2 31 37 2 51 8 2 27 19 2 55 25 0.05 - 73 0 0 2 17 46 19 16 55.1 42 109 52 2 8 0 2 27 32 2 3 42 2 31 49 0.05 - 72 0 0 1 54 2 19 16 58.8 43 109 51 1 44 16 2 3 48 1 39 58 2 8 6 0.05 - 71 0 0 1 30 11 19 17 2.6 44 109 50 1 20 25 1 39 58 1 16 7 1 44 16 0.05 - 70 0 0 1 6 14 19 17 6.4 46 109 49 0 56 27 1 16 1 0 52 9 1 20 19 0.05 - 69 0 0 0 42 12 19 17 10.3 47 109 48 0 32 24 0 51 59 0 28 6 0 56 17 0.05 - 68 0 0 0 18 4 19 17 14.3 48 109 47 0 8 16 0 27 51 0 3 58 0 32 9 0.05 - 67 0 0 - 0 6 9 19 17 18.4 49 109 46 - 0 15 56 0 3 39 - 0 20 15 0 7 58 0.05 - 66 0 0 - 0 30 25 19 17 22.6 50 109 45 - 0 40 13 - 0 20 37 - 0 44 31 - 0 16 18 0.05 - 65 0 0 - 0 54 44 19 17 26.8 51 108 44 - 1 4 32 - 0 44 56 - 1 8 51 - 0 40 37 0.05 - 64 0 0 - 1 19 6 19 17 31.0 52 108 43 - 1 28 54 - 1 9 18 - 1 33 13 - 1 4 59 0.05 - 63 0 0 - 1 43 30 19 17 35.4 53 108 42 - 1 53 19 - 1 33 42 - 1 57 37 - 1 29 23 0.05 - 62 0 0 - 2 7 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17 264 -61 -23 23 54 -23 5 37 -23 27 56 -23 1 36 0.05 48 0 0 -23 7 44 19 25 0.1 16 263 -62 -23 16 53 -22 58 35 -23 20 54 -22 54 33 0.05 49 0 0 -23 0 21 19 25 1.4 15 263 -62 -23 9 30 -22 51 11 -23 13 32 -22 47 9 0.05 50 0 0 -22 52 36 19 25 2.6 14 263 -63 -23 1 47 -22 43 26 -23 5 48 -22 39 24 0.05 51 0 0 -22 44 31 19 25 3.7 14 262 -64 -22 53 42 -22 35 21 -22 57 44 -22 31 19 0.05 52 0 0 -22 36 5 19 25 4.8 13 262 -65 -22 45 16 -22 26 54 -22 49 18 -22 22 52 0.05 53 0 0 -22 27 18 19 25 5.8 12 261 -65 -22 36 29 -22 18 6 -22 40 32 -22 14 4 0.05 54 0 0 -22 18 10 19 25 6.7 11 261 -66 -22 27 22 -22 8 58 -22 31 25 -22 4 55 0.05 55 0 0 -22 8 41 19 25 7.5 10 261 -66 -22 17 54 -21 59 28 -22 21 57 -21 55 25 0.06 56 0 0 -21 58 52 19 25 8.3 9 260 -67 -22 8 5 -21 49 39 -22 12 8 -21 45 35 0.06 57 0 0 -21 48 42 19 25 9.0 8 260 -68 -21 57 56 -21 39 28 -22 1 59 -21 35 24 0.06 58 0 0 -21 38 11 19 25 9.6 7 260 -68 -21 47 26 -21 28 57 -21 51 30 -21 24 53 0.06 59 0 0 -21 27 20 19 25 10.1 6 259 -69 -21 36 35 -21 18 5 -21 40 39 -21 14 1 0.06 60 0 0 -21 16 9 19 25 10.6 5 259 -69 -21 25 25 -21 6 53 -21 29 29 -21 2 49 0.07 61 0 0 -21 4 37 19 25 10.9 4 258 -70 -21 13 54 -20 55 21 -21 17 58 -20 51 16 0.07 62 0 0 -20 52 45 19 25 11.2 3 258 -70 -21 2 3 -20 43 28 -21 6 8 -20 39 24 0.08 63 0 0 -20 40 34 19 25 11.5 2 258 -71 -20 49 51 -20 31 16 -20 53 57 -20 27 11 0.09 64 0 0 -20 28 2 19 25 11.6 1 257 -71 -20 37 20 -20 18 44 -20 41 26 -20 14 38 0.13 65 0 0 -20 15 11 19 25 11.7 0 257 -72 -20 24 30 -20 5 52 -20 28 35 -20 1 46 0.50 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 390-073820 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 15 29.3977 DE: -12 11 22.567 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 15 29.3977 DE: -12 11 22.567 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * B mag [mag]: 12.5 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (732) Tjilaki asteroid class: approx. diameter [km]: 33 approx. diameter ["]: 0.020 distance from Earth [AU]: 2.26380 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 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): 0.013", 0.003", 94.686° remarks: * orbital elements for (732)Tjilaki : Mean anomaly = 43.4942322776 deg Arg. of pericenter = 63.3725888183 deg Long. of node = 173.2945154083 deg Inclination = 11.0024977009 deg Eccentricity = 0.0449037356 Semimajor axis = 2.4562481824 AU Perihelion dist = 2.3459534634 AU Mag: H = 10.56, G = 0.15 Epoch of elements : MJD 60570.80585796 TDT (2024 Sep 17.8059) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,1.50,2024,9,17,19.340595,-0.013968,-0.042049,11.975747,-3.896347,0.005439,-0.000302,0.000000,0.000000 -28.1066,-12.2173,-111.55,1.83,False UCAC4 390-073820,17.25816605,-12.1896021,12.54,11.22,10.51,0.2,0,,17.28113725,-12.2172527,4.17,4.43,0,0,0 732,Tjilaki,15.36,33.465,2.2638,0,0,3.173,-15.13,,1.8,0 0,43.2879,2024,9,17,63.3726,173.2945,11.0025,0.04490,2.45625,2.34595,10.56,5.0,0.15 1.220,0.0133,0.0033,95,0.0045,Known errors,1.03,0,-1,-1 20240917_073820,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org