IOTA/IOTA-ES occultation update for (756) Lilliana / TYC 4951-00012-1 event on 2023 Jul 07, 09:08 UT Visible from Australia Summary ------- On 2023 Jul 07 UT, the 66.3 km diameter asteroid (756) Lilliana will occult a 12.5 mag star in the constellation Virgo for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.90 mag to 15.31 mag (the magnitude of the asteroid) for at most 3.210 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: 2023 Jul 07, 09:03 - 2023 Jul 07, 09:13 * geocentric midpoint of event [JD]: 2460132.88084133 * magnitude of target star: 12.49 * magnitude drop [mag]: 2.90 * estimated maximum duration [s]: 3.210 * Moon: 80 % sunlit, 149° distance * Sun: 84° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.002", 89°) * approx speed of asteroid's shadow [km/s]: 20.6784 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4951-00012-1 by 756 Lilliana on 2023 Jul 7 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 38 0 0 -16 22 14 9 3 38.0 1 93 50 -16 41 38 -16 2 53 -16 44 45 -15 59 47 .... 39 0 0 -16 25 15 9 3 38.2 2 92 51 -16 44 39 -16 5 53 -16 47 46 -16 2 47 0.30 40 0 0 -16 28 22 9 3 38.4 3 92 51 -16 47 46 -16 9 0 -16 50 53 -16 5 54 0.34 41 0 0 -16 31 35 9 3 38.7 4 92 51 -16 50 59 -16 12 13 -16 54 6 -16 9 7 0.35 42 0 0 -16 34 54 9 3 39.1 5 91 51 -16 54 18 -16 15 31 -16 57 25 -16 12 25 0.36 43 0 0 -16 38 19 9 3 39.6 6 91 51 -16 57 43 -16 18 56 -17 0 50 -16 15 50 0.37 44 0 0 -16 41 49 9 3 40.2 7 91 51 -17 1 14 -16 22 27 -17 4 21 -16 19 21 0.37 45 0 0 -16 45 26 9 3 40.9 8 91 51 -17 4 51 -16 26 3 -17 7 58 -16 22 57 0.38 46 0 0 -16 49 8 9 3 41.6 8 90 51 -17 8 34 -16 29 46 -17 11 41 -16 26 40 0.38 47 0 0 -16 52 56 9 3 42.5 9 90 51 -17 12 22 -16 33 34 -17 15 29 -16 30 28 0.38 48 0 0 -16 56 50 9 3 43.5 10 90 50 -17 16 16 -16 37 27 -17 19 23 -16 34 21 0.38 49 0 0 -17 0 50 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275 -68 -28 4 11 -27 25 30 -28 7 17 -27 22 25 0.41 -160 0 0 -27 43 42 9 12 59.7 15 275 -69 -28 3 4 -27 24 23 -28 6 10 -27 21 18 0.41 -159 0 0 -27 42 29 9 13 1.0 14 274 -69 -28 1 50 -27 23 9 -28 4 57 -27 20 4 0.41 -158 0 0 -27 41 9 9 13 2.2 13 274 -70 -28 0 30 -27 21 49 -28 3 37 -27 18 44 0.41 -157 0 0 -27 39 43 9 13 3.3 12 273 -71 -27 59 4 -27 20 23 -28 2 11 -27 17 18 0.41 -156 0 0 -27 38 10 9 13 4.4 12 273 -72 -27 57 32 -27 18 51 -28 0 39 -27 15 45 0.41 -155 0 0 -27 36 32 9 13 5.4 11 272 -73 -27 55 54 -27 17 12 -27 59 0 -27 14 7 0.41 -154 0 0 -27 34 47 9 13 6.3 10 272 -74 -27 54 9 -27 15 28 -27 57 16 -27 12 22 0.42 -153 0 0 -27 32 56 9 13 7.2 9 272 -75 -27 52 19 -27 13 37 -27 55 25 -27 10 31 0.42 -152 0 0 -27 31 0 9 13 7.9 8 271 -75 -27 50 22 -27 11 40 -27 53 29 -27 8 34 0.42 -151 0 0 -27 28 57 9 13 8.6 7 271 -76 -27 48 19 -27 9 37 -27 51 26 -27 6 31 0.42 -150 0 0 -27 26 48 9 13 9.2 6 270 -77 -27 46 11 -27 7 28 -27 49 17 -27 4 22 0.43 -149 0 0 -27 24 33 9 13 9.7 5 270 -78 -27 43 56 -27 5 13 -27 47 2 -27 2 7 0.43 -148 0 0 -27 22 12 9 13 10.2 4 269 -79 -27 41 35 -27 2 52 -27 44 42 -26 59 47 0.44 -147 0 0 -27 19 46 9 13 10.5 4 269 -80 -27 39 9 -27 0 26 -27 42 15 -26 57 20 0.45 -146 0 0 -27 17 13 9 13 10.8 3 268 -80 -27 36 36 -26 57 53 -27 39 43 -26 54 47 0.47 -145 0 0 -27 14 35 9 13 11.0 2 268 -81 -27 33 58 -26 55 15 -27 37 5 -26 52 9 0.51 -144 0 0 -27 11 51 9 13 11.1 1 267 -82 -27 31 14 -26 52 31 -27 34 21 -26 49 25 0.63 Uncertainty in time = +/- 2 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: TYC 4951-00012-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 12 34 37.3707 DE: -02 35 51.160 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 12 34 37.3706 DE: -02 35 51.159 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (756) Lilliana asteroid class: approx. diameter [km]: 66 approx. diameter ["]: 0.035 distance from Earth [AU]: 2.63210 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): 0.018", 0.002", 88.548° remarks: * orbital elements for (756)Lilliana : Mean anomaly = 359.1030896913 deg Arg. of pericenter = 4.1283562412 deg Long. of node = 208.0441278123 deg Inclination = 20.3485122304 deg Eccentricity = 0.1479023496 Semimajor axis = 3.1982840513 AU Perihelion dist = 2.7252503253 AU Mag: H = 9.96, G = 0.15 Epoch of elements : MJD 60132.38083333 TDT (2023 Jul 07.3808) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#712023Apr24,3.21,2023,7,7,9.140192,-0.034498,-0.366928,11.619928,-1.095708,0.005044,-0.002143,0.000000,0.000000 126.7717,-2.7261,44.13,22.59,False TYC 4951-00012-1,12.57704743,-2.5975445,0.00,12.49,0.00,0.0,0,,12.59702520,-2.7260742,2.90,0.00,0,0,0 756,Lilliana,15.31,66.3,2.6321,0,0,2.591,-3.66,,3.2,0 0,359.0375,2023,7,7,4.1284,208.0441,20.3485,0.14790,3.19828,2.72525,9.98,5.0,0.15 1.080,0.0183,0.0017,89,0.0028,Known errors,-1.00,-1,-1,-1 20230707_0012-1,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 03:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org