IOTA/IOTA-ES occultation update for (1229) Tilia / TYC 2-00692-1 event on 2024 Oct 30, 10:32 UT Visible from Summary ------- On 2024 Oct 30 UT, the 28.7422989232174 km diameter asteroid (1229) Tilia will occult a 10.4 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.14 mag to 15.56 mag (the magnitude of the asteroid) for at most 4.990 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 Oct 30, 10:15 - 2024 Oct 30, 10:49 * geocentric midpoint of event [JD]: 2460613.93919596 * magnitude of target star: 10.43 * magnitude drop [mag]: 5.14 * estimated maximum duration [s]: 4.990 * Moon: 4 % sunlit, 170° distance * Sun: 148° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 8.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.036, +/- 0.015) * 1 sigma uncertainty ellipse (major, minor, PA): (0.039", 0.002", 68°) * approx speed of asteroid's shadow [km/s]: 5.7843 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2-00692-1 by 1229 Tilia on 2024 Oct 30 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 76 0 0 -51 10 29 10 49 11.6 0 86 28 -51 1 55 -51 19 3 -50 59 4 -51 21 54 .... 77 0 0 -51 8 3 10 49 11.5 1 86 27 -50 59 28 -51 16 37 -50 56 37 -51 19 29 0.27 78 0 0 -51 5 17 10 49 11.2 2 85 27 -50 56 42 -51 13 52 -50 53 51 -51 16 43 0.34 79 0 0 -51 2 11 10 49 10.8 2 84 26 -50 53 36 -51 10 47 -50 50 45 -51 13 38 0.37 80 0 0 -50 58 46 10 49 10.2 3 83 26 -50 50 10 -51 7 22 -50 47 19 -51 10 14 0.39 81 0 0 -50 55 1 10 49 9.5 3 83 25 -50 46 25 -51 3 38 -50 43 33 -51 6 30 0.40 82 0 0 -50 50 56 10 49 8.6 4 82 24 -50 42 20 -50 59 33 -50 39 28 -51 2 26 0.41 83 0 0 -50 46 32 10 49 7.6 5 81 24 -50 37 55 -50 55 10 -50 35 3 -50 58 2 0.41 84 0 0 -50 41 48 10 49 6.4 5 80 23 -50 33 10 -50 50 26 -50 30 18 -50 53 19 0.42 85 0 0 -50 36 43 10 49 5.1 6 79 23 -50 28 5 -50 45 22 -50 25 13 -50 48 15 0.42 86 0 0 -50 31 19 10 49 3.6 7 79 22 -50 22 40 -50 39 59 -50 19 48 -50 42 52 0.42 87 0 0 -50 25 36 10 49 2.0 7 78 21 -50 16 56 -50 34 16 -50 14 3 -50 37 9 0.43 88 0 0 -50 19 32 10 49 0.2 8 77 21 -50 10 51 -50 28 13 -50 7 58 -50 31 7 0.43 89 0 0 -50 13 8 10 48 58.3 9 76 20 -50 4 26 -50 21 50 -50 1 33 -50 24 44 0.43 90 0 0 -50 6 24 10 48 56.2 9 76 19 -49 57 42 -50 15 7 -49 54 48 -50 18 1 0.43 91 0 0 -49 59 20 10 48 53.9 10 75 19 -49 50 37 -50 8 4 -49 47 43 -50 10 58 0.44 92 0 0 -49 51 56 10 48 51.5 10 74 18 -49 43 12 -50 0 40 -49 40 17 -50 3 35 0.44 93 0 0 -49 44 11 10 48 48.9 11 73 17 -49 35 26 -49 52 57 -49 32 32 -49 55 52 0.44 94 0 0 -49 36 6 10 48 46.2 12 73 17 -49 27 20 -49 44 53 -49 24 26 -49 47 48 0.44 95 0 0 -49 27 41 10 48 43.3 12 72 16 -49 18 54 -49 36 29 -49 15 59 -49 39 24 0.44 96 0 0 -49 18 56 10 48 40.2 13 71 16 -49 10 8 -49 27 44 -49 7 12 -49 30 40 0.44 97 0 0 -49 9 50 10 48 37.0 14 70 15 -49 1 1 -49 18 39 -48 58 5 -49 21 36 0.44 98 0 0 -49 0 23 10 48 33.6 14 70 14 -48 51 33 -49 9 14 -48 48 37 -49 12 10 0.44 99 0 0 -48 50 36 10 48 30.0 15 69 14 -48 41 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- 2 28 6 - 2 51 45 0.43 -139 0 0 - 2 22 35 10 20 18.7 39 275 -64 - 2 13 43 - 2 31 27 - 2 10 47 - 2 34 24 0.43 -138 0 0 - 2 5 39 10 20 5.7 38 274 -64 - 1 56 49 - 2 14 30 - 1 53 52 - 2 17 27 0.43 -137 0 0 - 1 49 8 10 19 53.0 37 274 -63 - 1 40 19 - 1 57 58 - 1 37 23 - 2 0 55 0.44 -136 0 0 - 1 33 3 10 19 40.6 36 274 -62 - 1 24 14 - 1 41 52 - 1 21 19 - 1 44 48 0.44 -135 0 0 - 1 17 23 10 19 28.5 35 273 -62 - 1 8 35 - 1 26 11 - 1 5 40 - 1 29 7 0.44 -134 0 0 - 1 2 8 10 19 16.6 34 273 -61 - 0 53 22 - 1 10 56 - 0 50 26 - 1 13 51 0.44 -133 0 0 - 0 47 20 10 19 5.0 34 273 -60 - 0 38 34 - 0 56 6 - 0 35 39 - 0 59 2 0.44 -132 0 0 - 0 32 57 10 18 53.8 33 273 -60 - 0 24 12 - 0 41 43 - 0 21 18 - 0 44 38 0.44 -131 0 0 - 0 19 1 10 18 42.8 32 273 -59 - 0 10 17 - 0 27 46 - 0 7 23 - 0 30 41 0.44 -130 0 0 - 0 5 32 10 18 32.1 31 272 -58 0 3 12 - 0 14 16 0 6 6 - 0 17 10 0.44 -129 0 0 0 7 31 10 18 21.7 30 272 -58 0 16 14 - 0 1 12 0 19 8 - 0 4 6 0.44 -128 0 0 0 20 7 10 18 11.6 29 272 -57 0 28 49 0 11 25 0 31 43 0 8 30 0.44 -127 0 0 0 32 16 10 18 1.8 28 272 -56 0 40 58 0 23 34 0 43 51 0 20 40 0.44 -126 0 0 0 43 58 10 17 52.3 27 272 -55 0 52 39 0 35 16 0 55 32 0 32 23 0.44 -125 0 0 0 55 12 10 17 43.1 26 272 -54 1 3 52 0 46 31 1 6 45 0 43 38 0.44 -124 0 0 1 5 58 10 17 34.2 25 272 -54 1 14 38 0 57 18 1 17 31 0 54 25 0.44 -123 0 0 1 16 17 10 17 25.6 24 272 -53 1 24 56 1 7 38 1 27 49 1 4 45 0.44 -122 0 0 1 26 8 10 17 17.4 23 272 -52 1 34 46 1 17 29 1 37 39 1 14 36 0.44 -121 0 0 1 35 31 10 17 9.5 22 272 -51 1 44 8 1 26 52 1 47 1 1 23 59 0.44 -120 0 0 1 44 25 10 17 1.9 21 272 -50 1 53 2 1 35 47 1 55 54 1 32 54 0.45 -119 0 0 1 52 51 10 16 54.6 20 271 -49 2 1 27 1 44 13 2 4 19 1 41 21 0.45 -118 0 0 2 0 48 10 16 47.6 19 271 -48 2 9 24 1 52 11 2 12 16 1 49 18 0.45 -117 0 0 2 8 16 10 16 41.0 18 271 -48 2 16 52 1 59 39 2 19 44 1 56 47 0.45 -116 0 0 2 15 15 10 16 34.7 17 271 -47 2 23 51 2 6 39 2 26 43 2 3 47 0.45 -115 0 0 2 21 46 10 16 28.7 16 271 -46 2 30 21 2 13 10 2 33 13 2 10 18 0.45 -114 0 0 2 27 47 10 16 23.1 15 271 -45 2 36 22 2 19 11 2 39 13 2 16 19 0.45 -113 0 0 2 33 19 10 16 17.8 14 271 -44 2 41 53 2 24 43 2 44 45 2 21 52 0.45 -112 0 0 2 38 21 10 16 12.8 13 271 -43 2 46 55 2 29 46 2 49 46 2 26 54 0.46 -111 0 0 2 42 53 10 16 8.2 12 271 -42 2 51 28 2 34 18 2 54 19 2 31 27 0.46 -110 0 0 2 46 56 10 16 3.9 11 272 -41 2 55 30 2 38 21 2 58 21 2 35 30 0.46 -109 0 0 2 50 28 10 16 0.0 10 272 -40 2 59 3 2 41 54 3 1 54 2 39 2 0.46 -108 0 0 2 53 31 10 15 56.4 9 272 -39 3 2 5 2 44 56 3 4 56 2 42 5 0.47 -107 0 0 2 56 3 10 15 53.2 8 272 -38 3 4 37 2 47 29 3 7 28 2 44 37 0.47 -106 0 0 2 58 5 10 15 50.3 8 272 -37 3 6 39 2 49 31 3 9 30 2 46 39 0.47 -105 0 0 2 59 36 10 15 47.7 7 272 -37 3 8 10 2 51 2 3 11 1 2 48 10 0.48 -104 0 0 3 0 37 10 15 45.6 6 272 -36 3 9 11 2 52 2 3 12 2 2 49 11 0.49 -103 0 0 3 1 7 10 15 43.7 5 272 -35 3 9 41 2 52 32 3 12 32 2 49 41 0.49 -102 0 0 3 1 6 10 15 42.2 4 272 -34 3 9 40 2 52 31 3 12 31 2 49 39 0.51 -101 0 0 3 0 33 10 15 41.1 3 272 -33 3 9 8 2 51 58 3 11 59 2 49 7 0.53 -100 0 0 2 59 30 10 15 40.4 2 272 -32 3 8 4 2 50 54 3 10 56 2 48 3 0.59 - 99 0 0 2 57 55 10 15 40.0 1 272 -31 3 6 30 2 49 19 3 9 21 2 46 28 0.83 Uncertainty in time = +/- 9 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 2-00692-1 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 17 07.1536 DE: +01 53 31.036 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 17 07.1535 DE: +01 53 31.036 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.4 * B mag [mag]: 10.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1229) Tilia asteroid class: approx. diameter [km]: 29 approx. diameter ["]: 0.022 distance from Earth [AU]: 1.80210 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.039", 0.002", 67.657° remarks: * orbital elements for (1229)Tilia : Mean anomaly = 8.2817031791 deg Arg. of pericenter = 167.0173367874 deg Long. of node = 197.3448275610 deg Inclination = 1.0406720582 deg Eccentricity = 0.1667357444 Semimajor axis = 3.2223254937 AU Perihelion dist = 2.6850486539 AU Mag: H = 11.43, G = 0.15 Epoch of elements : MJD 60613.43919359 TDT (2024 Oct 30.4392) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,4.99,2024,10,30,10.540703,0.184797,-0.362908,-2.909965,-1.480272,0.002867,0.001235,0.000001,0.000001 167.2554,2.0315,17.80,-14.01,False TYC 2-00692-1,0.28532044,1.8919545,10.90,10.43,10.18,0.1,0,,0.30679079,2.0315491,5.14,4.95,0,0,0 1229,Tilia,15.56,28.873,1.8021,0,0,-0.947,-7.22,,1.6,0 0,8.2069,2024,10,30,167.0173,197.3448,1.0407,0.16674,3.22233,2.68505,11.43,5.0,0.15 1.166,0.0390,0.0019,68,0.0037,Known errors,0.98,0,-1,-1 20241030_0692-1,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org