IOTA/IOTA-ES occultation update for (756) Lilliana / TYC 5681-01384-1 event on 2024 Feb 10, 19:32 UT Visible from Summary ------- On 2024 Feb 10 UT, the 66.395 km diameter asteroid (756) Lilliana will occult a 11.7 mag star in the constellation Serpens for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.01 mag to 15.72 mag (the magnitude of the asteroid) for at most 1.710 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: 2024 Feb 10, 19:29 - 2024 Feb 10, 19:35 * geocentric midpoint of event [JD]: 2460351.31415100 * magnitude of target star: 11.74 * magnitude drop [mag]: 4.01 * estimated maximum duration [s]: 1.710 * Moon: 1 % sunlit, 60° distance * Sun: 48° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 68 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.001", 79°) * approx speed of asteroid's shadow [km/s]: 38.8833 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5681-01384-1 by 756 Lilliana on 2024 Feb 10 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 108 0 0 -24 44 14 19 29 41.7 1 101 -37 -25 2 54 -24 25 35 -25 4 45 -24 23 45 .... 109 0 0 -24 54 33 19 29 41.7 2 100 -36 -25 13 12 -24 35 55 -25 15 3 -24 34 5 0.18 110 0 0 -25 4 37 19 29 41.8 3 100 -35 -25 23 16 -24 46 0 -25 25 6 -24 44 10 0.19 111 0 0 -25 14 26 19 29 42.0 4 99 -35 -25 33 3 -24 55 49 -25 34 53 -24 54 0 0.19 112 0 0 -25 23 59 19 29 42.2 5 99 -34 -25 42 36 -25 5 24 -25 44 26 -25 3 34 0.19 113 0 0 -25 33 18 19 29 42.4 5 98 -33 -25 51 54 -25 14 43 -25 53 44 -25 12 53 0.19 114 0 0 -25 42 21 19 29 42.7 6 98 -32 -26 0 56 -25 23 47 -26 2 46 -25 21 57 0.19 115 0 0 -25 51 8 19 29 43.0 7 98 -31 -26 9 43 -25 32 35 -26 11 32 -25 30 46 0.19 116 0 0 -25 59 40 19 29 43.3 8 97 -31 -26 18 14 -25 41 8 -26 20 3 -25 39 19 0.19 117 0 0 -26 7 57 19 29 43.8 9 97 -30 -26 26 29 -25 49 25 -26 28 19 -25 47 36 0.19 118 0 0 -26 15 57 19 29 44.2 10 96 -29 -26 34 29 -25 57 26 -26 36 18 -25 55 37 0.19 119 0 0 -26 23 42 19 29 44.7 11 96 -28 -26 42 13 -26 5 12 -26 44 2 -26 3 23 0.19 120 0 0 -26 31 11 19 29 45.2 12 95 -27 -26 49 41 -26 12 42 -26 51 30 -26 10 53 0.19 121 0 0 -26 38 24 19 29 45.8 13 95 -27 -26 56 53 -26 19 55 -26 58 42 -26 18 6 0.19 122 0 0 -26 45 21 19 29 46.4 14 94 -26 -27 3 49 -26 26 53 -27 5 39 -26 25 4 0.19 123 0 0 -26 52 1 19 29 47.0 15 94 -25 -27 10 30 -26 33 34 -27 12 19 -26 31 45 0.19 124 0 0 -26 58 26 19 29 47.7 15 94 -24 -27 16 54 -26 40 0 -27 18 43 -26 38 11 0.19 125 0 0 -27 4 34 19 29 48.4 16 93 -23 -27 23 1 -26 46 9 -27 24 50 -26 44 20 0.19 126 0 0 -27 10 27 19 29 49.2 17 93 -23 -27 28 53 -26 52 2 -27 30 42 -26 50 13 0.19 127 0 0 -27 16 3 19 29 50.0 18 92 -22 -27 34 28 -26 57 38 -27 36 17 -26 55 49 0.19 128 0 0 -27 21 22 19 29 50.8 19 92 -21 -27 39 47 -27 2 58 -27 41 36 -27 1 10 0.19 129 0 0 -27 26 25 19 29 51.7 20 91 -20 -27 44 50 -27 8 2 -27 46 39 -27 6 13 0.19 130 0 0 -27 31 12 19 29 52.6 21 91 -19 -27 49 36 -27 12 49 -27 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0 18 24 0 19 18 - 0 20 15 0 21 9 0.21 - 83 0 0 0 14 28 19 34 59.3 13 260 59 - 0 4 23 0 33 17 - 0 6 14 0 35 8 0.21 - 82 0 0 0 28 14 19 34 59.9 12 260 58 0 9 24 0 47 3 0 7 33 0 48 54 0.21 - 81 0 0 0 41 46 19 35 0.5 11 260 57 0 22 57 1 0 34 0 21 6 1 2 25 0.21 - 80 0 0 0 55 4 19 35 1.1 10 260 56 0 36 16 1 13 51 0 34 25 1 15 42 0.21 - 79 0 0 1 8 8 19 35 1.6 9 260 55 0 49 21 1 26 53 0 47 30 1 28 44 0.22 - 78 0 0 1 20 57 19 35 2.0 8 260 54 1 2 11 1 39 41 1 0 20 1 41 32 0.22 - 77 0 0 1 33 30 19 35 2.4 7 260 53 1 14 45 1 52 14 1 12 55 1 54 5 0.22 - 76 0 0 1 45 49 19 35 2.7 6 260 52 1 27 5 2 4 32 1 25 14 2 6 22 0.23 - 75 0 0 1 57 53 19 35 3.0 5 260 52 1 39 9 2 16 35 1 37 19 2 18 25 0.23 - 74 0 0 2 9 41 19 35 3.2 4 260 51 1 50 58 2 28 22 1 49 8 2 30 12 0.24 - 73 0 0 2 21 13 19 35 3.4 3 260 50 2 2 31 2 39 53 2 0 41 2 41 43 0.26 - 72 0 0 2 32 29 19 35 3.5 2 260 49 2 13 49 2 51 9 2 11 59 2 52 59 0.29 - 71 0 0 2 43 30 19 35 3.6 1 260 48 2 24 50 3 2 8 2 23 0 3 3 58 0.39 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: TYC 5681-01384-1 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 16 36.2500 DE: -10 00 23.835 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 16 36.2501 DE: -10 00 23.835 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (756) Lilliana asteroid class: approx. diameter [km]: 66 approx. diameter ["]: 0.027 distance from Earth [AU]: 3.40660 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#71 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): 0.017", 0.001", 78.654° remarks: * orbital elements for (756)Lilliana : Mean anomaly = 36.7983642914 deg Arg. of pericenter = 4.0626966245 deg Long. of node = 208.0429919293 deg Inclination = 20.3482377771 deg Eccentricity = 0.1478459867 Semimajor axis = 3.1978870368 AU Perihelion dist = 2.7250922725 AU Mag: H = 9.96, G = 0.15 Epoch of elements : MJD 60350.81415092 TDT (2024 Feb 10.8142) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#712023Apr24,1.71,2024,2,10,19.539624,0.045999,-0.184549,21.307614,5.258230,-0.004399,0.000802,-0.000001,0.000000 -158.9958,-10.0001,-109.54,-14.32,False TYC 5681-01384-1,18.27673607,-10.0066207,12.35,11.74,11.41,0.0,0,,18.29857028,-10.0000925,4.01,3.89,0,0,0 756,Lilliana,15.72,66.395,3.4066,0,0,3.724,13.57,,3.2,0 0,36.6580,2024,2,10,4.0627,208.0430,20.3482,0.14785,3.19789,2.72509,9.95,5.0,0.15 1.049,0.0167,0.0011,79,0.0013,Known errors,0.81,0,-1,-1 20240210_1384-1,60138.16 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 03:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org