IOTA/IOTA-ES occultation update for (756) Lilliana / UCAC4 403-054826 event on 2023 Apr 18, 13:54 UT Visible from New Zealand, Australia, Taiwan, China Summary ------- On 2023 Apr 18 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 New Zealand, Australia, Taiwan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.79 mag to 14.04 mag (the magnitude of the asteroid) for at most 5.380 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: 92 * date and approx. time of event: 2023 Apr 18, 13:45 - 2023 Apr 18, 14:03 * geocentric midpoint of event [JD]: 2460053.07956175 * magnitude of target star: 12.48 * magnitude drop [mag]: 1.79 * estimated maximum duration [s]: 5.380 * Moon: 3 % sunlit, 170° distance * Sun: 156° distance * rough path description: New Zealand, Australia, Taiwan, China The occultation path -------------------- * approximate projected width [km]: 67 * 1 sigma uncertainty interval [path widths]: +/- 0.49 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.029, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.004", 93°) * approx speed of asteroid's shadow [km/s]: 12.3173 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 403-054826 by 756 Lilliana on 2023 Apr 18 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 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 64 12 9 .... 77 0 0 64 37 8 14 2 59.0 8 133 2 .. .. .. 64 12 56 .. .. .. 63 49 13 .... 78 0 0 64 13 49 14 2 58.3 8 134 2 64 38 21 63 49 19 65 2 29 63 25 18 -0.15 79 0 0 63 49 30 14 2 57.5 9 135 1 64 14 21 63 24 42 64 38 48 63 0 22 -0.15 80 0 0 63 24 9 14 2 56.6 10 136 1 63 49 19 62 59 1 64 14 6 62 34 22 -0.16 81 0 0 62 57 42 14 2 55.6 10 136 0 63 23 12 62 32 13 63 48 19 62 7 15 -0.16 82 0 0 62 30 6 14 2 54.6 11 137 -1 62 55 58 62 4 17 63 21 25 61 38 58 -0.16 83 0 0 62 1 18 14 2 53.4 11 138 -1 62 27 32 61 35 8 62 53 20 61 9 28 -0.16 84 0 0 61 31 16 14 2 52.1 12 139 -2 61 57 51 61 4 43 62 24 1 60 38 42 -0.16 85 0 0 60 59 55 14 2 50.7 13 140 -3 61 26 53 60 33 0 61 53 26 60 6 37 -0.16 86 0 0 60 27 12 14 2 49.2 14 141 -3 60 54 34 59 59 54 61 21 30 59 33 8 -0.16 87 0 0 59 53 3 14 2 47.5 14 142 -4 60 20 49 59 25 21 60 48 9 58 58 12 -0.16 88 0 0 59 17 25 14 2 45.7 15 143 -5 59 45 36 58 49 19 60 13 20 58 21 46 -0.16 89 0 0 58 40 14 14 2 43.7 16 143 -5 59 8 49 58 11 42 59 36 59 57 43 45 -0.17 90 0 0 58 1 24 14 2 41.6 17 144 -6 58 30 26 57 32 27 58 59 1 57 4 5 -0.17 91 0 0 57 20 53 14 2 39.3 18 145 -7 57 50 21 56 51 29 58 19 22 56 22 41 -0.17 92 0 0 56 38 35 14 2 36.8 19 146 -8 57 8 30 56 8 44 57 37 57 55 39 31 -0.17 93 0 0 55 54 26 14 2 34.1 19 147 -9 56 24 48 55 24 8 56 54 43 54 54 28 -0.17 94 0 0 55 8 21 14 2 31.1 20 148 -10 55 39 11 54 37 36 56 9 33 54 7 28 -0.17 95 0 0 54 20 15 14 2 27.9 21 148 -11 54 51 34 53 49 2 55 22 24 53 18 28 -0.17 96 0 0 53 30 5 14 2 24.4 22 149 -12 54 1 52 52 58 24 54 33 11 52 27 22 -0.17 97 0 0 52 37 45 14 2 20.7 23 150 -13 53 10 1 52 5 35 53 41 48 51 34 6 -0.17 98 0 0 51 43 10 14 2 16.6 25 151 -14 52 15 55 51 10 32 52 48 11 50 38 34 -0.17 99 0 0 50 46 16 14 2 12.3 26 152 -15 51 19 30 50 13 9 51 52 15 49 40 44 -0.17 100 0 0 49 46 59 14 2 7.6 27 153 -16 50 20 42 49 13 23 50 53 55 48 40 30 -0.17 101 0 0 48 45 14 14 2 2.5 28 153 -17 49 19 25 48 11 10 49 53 8 47 37 49 -0.17 102 0 0 47 40 57 14 1 57.0 29 154 -18 48 15 37 47 6 25 48 49 48 46 32 37 -0.17 103 0 0 46 34 5 14 1 51.1 31 155 -19 47 9 13 45 59 5 47 43 51 45 24 50 -0.17 104 0 0 45 24 35 14 1 44.7 32 156 -21 46 0 10 44 49 8 46 35 16 44 14 26 -0.18 105 0 0 44 12 24 14 1 37.9 33 156 -22 44 48 26 43 36 30 45 23 58 43 1 24 -0.18 106 0 0 42 57 30 14 1 30.6 35 157 -23 43 33 58 42 21 11 44 9 56 41 45 40 -0.18 107 0 0 41 39 53 14 1 22.8 36 158 -25 42 16 45 41 3 10 42 53 8 40 27 15 -0.18 108 0 0 40 19 32 14 1 14.4 38 159 -26 40 56 48 39 42 26 41 33 33 39 6 9 -0.18 109 0 0 38 56 28 14 1 5.5 39 160 -28 39 34 5 38 19 0 40 11 13 37 42 22 -0.18 110 0 0 37 30 42 14 0 56.0 41 160 -29 38 8 40 36 52 55 38 46 8 36 15 57 -0.18 111 0 0 36 2 18 14 0 45.9 43 161 -31 36 40 35 35 24 12 37 18 21 34 46 58 -0.18 112 0 0 34 31 20 14 0 35.3 44 162 -32 35 9 53 33 52 58 35 47 56 33 15 27 -0.18 113 0 0 32 57 52 14 0 24.0 46 163 -34 33 36 40 32 19 16 34 14 57 31 41 31 -0.18 114 0 0 31 22 2 14 0 12.1 48 164 -36 32 1 2 30 43 13 32 39 31 30 5 17 -0.18 115 0 0 29 43 57 13 59 59.6 49 164 -37 30 23 6 29 4 58 31 1 46 28 26 52 -0.18 116 0 0 28 3 45 13 59 46.5 51 165 -39 28 43 2 27 24 39 29 21 49 26 46 25 -0.18 117 0 0 26 21 37 13 59 32.9 53 166 -41 27 1 0 25 42 25 27 39 52 25 4 7 -0.18 118 0 0 24 37 43 13 59 18.7 55 167 -43 25 17 9 23 58 29 25 56 4 23 20 8 -0.18 119 0 0 22 52 16 13 59 3.9 57 168 -45 23 31 42 22 13 2 24 10 38 21 34 40 -0.18 120 0 0 21 5 28 13 58 48.6 59 170 -46 21 44 53 20 26 15 22 23 46 19 47 55 -0.18 121 0 0 19 17 33 13 58 32.9 61 171 -48 19 56 53 18 38 24 20 35 42 18 0 7 -0.17 122 0 0 17 28 44 13 58 16.7 63 172 -50 18 7 57 16 49 41 18 46 40 16 11 30 -0.17 123 0 0 15 39 15 13 58 0.1 65 174 -52 16 18 20 15 0 20 16 56 54 14 22 18 -0.17 124 0 0 13 49 20 13 57 43.2 66 176 -54 14 28 14 13 10 36 15 6 38 12 32 43 -0.17 125 0 0 11 59 14 13 57 26.0 68 178 -56 12 37 56 11 20 43 13 16 7 10 43 2 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303 -62 -37 21 13 -38 10 53 -36 56 47 -38 35 14 -0.15 163 0 0 -38 29 57 13 48 55.2 47 303 -61 -38 5 24 -38 54 28 -37 41 15 -39 18 31 -0.15 164 0 0 -39 12 17 13 48 48.3 46 303 -60 -38 48 1 -39 36 31 -38 24 9 -40 0 17 -0.15 165 0 0 -39 53 6 13 48 41.6 45 302 -59 -39 29 7 -40 17 4 -39 5 32 -40 40 33 -0.15 166 0 0 -40 32 29 13 48 35.2 44 302 -58 -40 8 46 -40 56 10 -39 45 27 -41 19 23 -0.15 167 0 0 -41 10 26 13 48 29.1 44 301 -57 -40 46 59 -41 33 51 -40 23 56 -41 56 50 -0.15 168 0 0 -41 47 1 13 48 23.1 43 301 -56 -41 23 50 -42 10 11 -41 1 1 -42 32 55 -0.15 169 0 0 -42 22 17 13 48 17.4 42 300 -55 -41 59 20 -42 45 12 -41 36 46 -43 7 41 -0.15 170 0 0 -42 56 15 13 48 11.9 41 300 -55 -42 33 33 -43 18 56 -42 11 13 -43 41 10 -0.15 171 0 0 -43 28 58 13 48 6.6 40 299 -54 -43 6 30 -43 51 25 -42 44 24 -44 13 26 -0.15 172 0 0 -44 0 28 13 48 1.5 39 298 -53 -43 38 14 -44 22 42 -43 16 21 -44 44 30 -0.15 173 0 0 -44 30 48 13 47 56.5 38 298 -52 -44 8 47 -44 52 49 -43 47 7 -45 14 24 -0.16 174 0 0 -45 0 0 13 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10 -52 36 15 -0.16 -162 0 0 -52 8 32 13 46 36.6 20 280 -35 -51 49 55 -52 27 9 -51 31 36 -52 45 24 -0.16 -161 0 0 -52 17 12 13 46 34.7 20 280 -35 -51 58 39 -52 35 45 -51 40 24 -52 53 57 -0.16 -160 0 0 -52 25 15 13 46 32.8 19 279 -34 -52 6 46 -52 43 44 -51 48 35 -53 1 52 -0.16 -159 0 0 -52 32 42 13 46 31.0 18 278 -33 -52 14 16 -52 51 7 -51 56 8 -53 9 12 -0.16 -158 0 0 -52 39 32 13 46 29.2 18 277 -33 -52 21 9 -52 57 55 -52 3 5 -53 15 56 -0.16 -157 0 0 -52 45 47 13 46 27.5 17 276 -32 -52 27 27 -53 4 6 -52 9 25 -53 22 5 -0.16 -156 0 0 -52 51 27 13 46 25.9 16 276 -32 -52 33 9 -53 9 43 -52 15 10 -53 27 40 -0.16 -155 0 0 -52 56 31 13 46 24.4 16 275 -31 -52 38 16 -53 14 46 -52 20 19 -53 32 40 -0.17 -154 0 0 -53 1 1 13 46 22.9 15 274 -31 -52 42 48 -53 19 14 -52 24 53 -53 37 6 -0.17 -153 0 0 -53 4 57 13 46 21.5 15 273 -30 -52 46 45 -53 23 7 -52 28 52 -53 40 58 -0.17 -152 0 0 -53 8 18 13 46 20.1 14 273 -29 -52 50 8 -53 26 28 -52 32 17 -53 44 16 -0.17 -151 0 0 -53 11 6 13 46 18.8 13 272 -29 -52 52 57 -53 29 14 -52 35 7 -53 47 1 -0.17 -150 0 0 -53 13 20 13 46 17.5 13 271 -28 -52 55 12 -53 31 27 -52 37 23 -53 49 13 -0.17 -149 0 0 -53 15 0 13 46 16.3 12 270 -28 -52 56 53 -53 33 6 -52 39 4 -53 50 52 -0.17 -148 0 0 -53 16 7 13 46 15.2 12 269 -27 -52 58 0 -53 34 12 -52 40 12 -53 51 58 -0.17 -147 0 0 -53 16 40 13 46 14.1 11 269 -27 -52 58 33 -53 34 45 -52 40 45 -53 52 31 -0.17 -146 0 0 -53 16 40 13 46 13.1 11 268 -26 -52 58 33 -53 34 45 -52 40 45 -53 52 30 -0.17 -145 0 0 -53 16 6 13 46 12.1 10 267 -25 -52 57 59 -53 34 12 -52 40 10 -53 51 57 -0.17 -144 0 0 -53 14 58 13 46 11.2 9 266 -25 -52 56 51 -53 33 5 -52 39 2 -53 50 51 -0.17 -143 0 0 -53 13 17 13 46 10.3 9 265 -24 -52 55 9 -53 31 24 -52 37 19 -53 49 11 -0.17 -142 0 0 -53 11 2 13 46 9.5 8 265 -24 -52 52 53 -53 29 11 -52 35 2 -53 46 59 -0.17 -141 0 0 -53 8 13 13 46 8.8 8 264 -23 -52 50 2 -53 26 23 -52 32 10 -53 44 13 -0.17 -140 0 0 -53 4 50 13 46 8.1 7 263 -23 -52 46 38 -53 23 2 -52 28 44 -53 40 53 -0.17 -139 0 0 -53 0 53 13 46 7.5 6 262 -22 -52 42 38 -53 19 6 -52 24 42 -53 36 59 -0.17 -138 0 0 -52 56 20 13 46 6.9 6 261 -21 -52 38 4 -53 14 36 -52 20 6 -53 32 31 -0.17 -137 0 0 -52 51 13 13 46 6.3 5 261 -21 -52 32 54 -53 9 31 -52 14 53 -53 27 29 -0.17 -136 0 0 -52 45 30 13 46 5.9 4 260 -20 -52 27 8 -53 3 51 -52 9 5 -53 21 52 -0.17 -135 0 0 -52 39 12 13 46 5.5 4 259 -20 -52 20 47 -52 57 36 -52 2 40 -53 15 39 -0.17 -134 0 0 -52 32 17 13 46 5.1 3 258 -19 -52 13 49 -52 50 44 -51 55 39 -53 8 51 -0.17 -133 0 0 -52 24 45 13 46 4.8 3 258 -19 -52 6 13 -52 43 16 -51 48 0 -53 1 26 -0.17 -132 0 0 -52 16 37 13 46 4.6 2 257 -18 -51 58 1 -52 35 12 -51 39 44 -52 53 25 -0.17 -131 0 0 -52 7 50 13 46 4.4 1 256 -17 -51 49 10 -52 26 29 -51 30 48 -52 44 47 -0.17 -130 0 0 -51 58 25 13 46 4.3 1 255 -17 -51 39 40 -52 17 8 -51 21 14 -52 35 31 -0.16 -129 0 0 -51 48 20 13 46 4.2 0 254 -16 -51 29 31 -52 7 9 .. .. .. -52 25 36 -0.10 Uncertainty in time = +/- 3 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: UCAC4 403-054826 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 12 05 12.9657 DE: -09 34 55.937 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 12 05 12.9656 DE: -09 34 55.937 * 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 ["]: 0.051 distance from Earth [AU]: 1.80000 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#70 date of fit: 2023 Feb 07 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): 0.029", 0.004", 92.907° remarks: * orbital elements for (756)Lilliana : Mean anomaly = 345.3410687877 deg Arg. of pericenter = 4.1432776593 deg Long. of node = 208.0441639779 deg Inclination = 20.3483263286 deg Eccentricity = 0.1479101273 Semimajor axis = 3.1982938985 AU Perihelion dist = 2.7252338409 AU Mag: H = 9.97, G = 0.15 Epoch of elements : MJD 60052.57951389 TDT (2023 Apr 18.5795) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#702023Feb07,5.38,2023,4,18,13.909482,0.142085,0.075577,-3.270216,6.135086,0.002334,-0.000195,0.000001,-0.000001 126.5383,-9.7131,-28.79,10.86,False UCAC4 403-054826,12.08693492,-9.5822047,0.00,12.48,0.00,0.0,0,,12.10698252,-9.7131345,1.79,0.00,0,0,0 756,Lilliana,14.04,66.3,1.8000,0,0,-1.080,29.97,,3.2,0 0,345.2412,2023,4,18,4.1433,208.0442,20.3483,0.14791,3.19829,2.72523,9.98,5.0,0.15 1.491,0.0290,0.0037,93,0.0249,Known errors,-1.00,-1,-1,-1 20230418_054826,60004.05 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org