IOTA/IOTA-ES occultation update for (356) Liguria / UCAC4 280-132312 event on 2023 Jul 28, 21:19 UT Visible from Africa Summary ------- On 2023 Jul 28 UT, the 131.2 km diameter asteroid (356) Liguria will occult a 11.1 mag star in the constellation Scorpius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.67 mag to 13.67 mag (the magnitude of the asteroid) for at most 13.350 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 28, 21:14 - 2023 Jul 28, 21:23 * geocentric midpoint of event [JD]: 2460154.38851745 * magnitude of target star: 11.10 * magnitude drop [mag]: 2.67 * estimated maximum duration [s]: 13.350 * Moon: 79 % sunlit, 17° distance * Sun: 141° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 377 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.003", 91°) * approx speed of asteroid's shadow [km/s]: 9.8271 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 280-132312 by 356 Liguria on 2023 Jul 28 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 - 2 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 54 8 45 .... - 1 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 51 45 21 .. .. .. 50 46 5 .... 0 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 49 19 17 .. .. .. 48 36 59 .... 1 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 47 27 55 .. .. .. 46 53 11 .... 2 0 0 51 6 23 21 23 3.2 5 181 -12 .. .. .. 45 54 9 .. .. .. 45 23 55 .... 3 0 0 48 44 48 21 22 54.9 7 182 -15 .. .. .. 44 31 48 .. .. .. 44 4 38 -2.30 4 0 0 46 57 56 21 22 46.3 9 183 -16 .. .. .. 43 17 47 .. .. .. 42 52 52 -2.49 5 0 0 45 28 30 21 22 37.3 10 184 -18 51 5 19 42 10 18 52 58 23 41 47 6 -2.57 6 0 0 44 10 20 21 22 28.1 12 185 -19 48 37 11 41 8 9 49 32 4 40 46 21 -2.62 7 0 0 43 0 24 21 22 18.8 13 185 -21 46 51 2 40 10 32 47 32 49 39 49 53 -2.65 8 0 0 41 56 53 21 22 9.2 14 186 -22 45 23 57 39 16 53 45 59 8 38 57 11 -2.66 9 0 0 40 58 38 21 21 59.6 15 187 -23 44 8 44 38 26 45 44 39 50 38 7 52 -2.68 10 0 0 40 4 53 21 21 49.8 15 188 -24 43 2 0 37 39 47 43 30 13 37 21 36 -2.69 11 0 0 39 15 2 21 21 39.9 16 189 -25 42 1 51 36 55 43 42 27 56 36 38 9 -2.69 12 0 0 38 28 41 21 21 29.9 17 190 -27 41 7 5 36 14 20 41 31 30 35 57 18 -2.70 13 0 0 37 45 27 21 21 19.9 17 190 -28 40 16 52 35 35 27 40 39 56 35 18 53 -2.70 14 0 0 37 5 7 21 21 9.8 18 191 -29 39 30 36 34 58 54 39 52 35 34 42 46 -2.71 15 0 0 36 27 27 21 20 59.8 18 192 -29 38 47 51 34 24 35 39 8 54 34 8 48 -2.71 16 0 0 35 52 16 21 20 49.6 19 193 -30 38 8 17 33 52 21 38 28 32 33 36 55 -2.71 17 0 0 35 19 26 21 20 39.5 19 194 -31 37 31 37 33 22 9 37 51 13 33 7 1 -2.71 18 0 0 34 48 48 21 20 29.4 19 195 -32 36 57 37 32 53 52 37 16 39 32 39 1 -2.71 19 0 0 34 20 16 21 20 19.4 20 196 -33 36 26 9 32 27 28 36 44 39 32 12 50 -2.71 20 0 0 33 53 46 21 20 9.3 20 196 -33 35 57 3 32 2 50 36 15 7 31 48 27 -2.71 21 0 0 33 29 13 21 19 59.3 20 197 -34 35 30 11 31 39 59 35 47 52 31 25 47 -2.71 22 0 0 33 6 32 21 19 49.3 20 198 -35 35 5 28 31 18 49 35 22 48 31 4 48 -2.71 23 0 0 32 45 41 21 19 39.4 20 199 -35 34 42 47 30 59 19 34 59 50 30 45 27 -2.71 24 0 0 32 26 37 21 19 29.6 20 200 -36 34 22 6 30 41 26 34 38 53 30 27 43 -2.71 25 0 0 32 9 15 21 19 19.8 20 201 -37 34 3 20 30 25 9 34 19 53 30 11 33 -2.72 26 0 0 31 53 36 21 19 10.2 20 202 -37 33 46 27 30 10 25 34 2 47 29 56 56 -2.72 27 0 0 31 39 35 21 19 0.6 20 202 -38 33 31 22 29 57 14 33 47 32 29 43 51 -2.72 28 0 0 31 27 13 21 18 51.1 20 203 -38 33 18 4 29 45 34 33 34 6 29 32 16 -2.72 29 0 0 31 16 27 21 18 41.8 20 204 -38 33 6 31 29 35 25 33 22 25 29 22 11 -2.72 30 0 0 31 7 17 21 18 32.5 20 205 -39 32 56 41 29 26 44 33 12 29 29 13 34 -2.72 31 0 0 30 59 41 21 18 23.4 19 205 -39 32 48 34 29 19 33 33 4 17 29 6 25 -2.73 32 0 0 30 53 39 21 18 14.4 19 206 -39 32 42 8 29 13 49 32 57 47 29 0 44 -2.73 33 0 0 30 49 10 21 18 5.6 19 207 -40 32 37 23 29 9 33 32 52 59 28 56 30 -2.73 34 0 0 30 46 14 21 17 56.9 18 208 -40 32 34 17 29 6 44 32 49 52 28 53 42 -2.74 35 0 0 30 44 51 21 17 48.4 18 208 -40 32 32 52 29 5 24 32 48 26 28 52 21 -2.74 36 0 0 30 45 1 21 17 40.1 18 209 -40 32 33 6 29 5 30 32 48 41 28 52 27 -2.74 37 0 0 30 46 45 21 17 31.9 17 210 -40 32 35 1 29 7 5 32 50 37 28 54 1 -2.75 38 0 0 30 50 2 21 17 24.0 17 211 -40 32 38 36 29 10 7 32 54 16 28 57 2 -2.75 39 0 0 30 54 53 21 17 16.2 16 211 -40 32 43 53 29 14 38 32 59 37 29 1 30 -2.76 40 0 0 31 1 19 21 17 8.6 16 212 -40 32 50 53 29 20 38 33 6 42 29 7 27 -2.76 41 0 0 31 9 21 21 17 1.3 15 213 -40 32 59 36 29 28 9 33 15 32 29 14 54 -2.77 42 0 0 31 19 0 21 16 54.2 15 213 -40 33 10 5 29 37 10 33 26 9 29 23 50 -2.77 43 0 0 31 30 19 21 16 47.3 14 214 -40 33 22 21 29 47 43 33 38 34 29 34 18 -2.78 44 0 0 31 43 17 21 16 40.7 13 215 -40 33 36 27 29 59 50 33 52 51 29 46 19 -2.79 45 0 0 31 57 58 21 16 34.4 13 215 -39 33 52 25 30 13 32 34 9 2 29 59 53 -2.80 46 0 0 32 14 23 21 16 28.3 12 216 -39 34 10 18 30 28 50 34 27 9 30 15 4 -2.81 47 0 0 32 32 35 21 16 22.6 11 217 -39 34 30 11 30 45 48 34 47 18 30 31 52 -2.82 48 0 0 32 52 38 21 16 17.1 10 217 -38 34 52 7 31 4 26 35 9 33 30 50 21 -2.83 49 0 0 33 14 34 21 16 12.0 10 218 -38 35 16 11 31 24 47 35 33 59 31 10 31 -2.84 50 0 0 33 38 27 21 16 7.2 9 218 -37 35 42 31 31 46 54 36 0 43 31 32 26 -2.85 51 0 0 34 4 24 21 16 2.8 8 219 -37 36 11 11 32 10 51 36 29 52 31 56 9 -2.87 52 0 0 34 32 28 21 15 58.8 7 220 -36 36 42 23 32 36 42 37 1 35 32 21 45 -2.89 53 0 0 35 2 46 21 15 55.2 6 220 -35 37 16 13 33 4 31 37 36 1 32 49 16 -2.91 54 0 0 35 35 24 21 15 52.1 5 221 -35 37 52 54 33 34 23 38 13 25 33 18 49 -2.95 55 0 0 36 10 32 21 15 49.4 4 221 -34 38 32 41 34 6 23 38 54 2 33 50 28 -2.99 56 0 0 36 48 19 21 15 47.2 3 222 -33 39 15 52 34 40 38 39 38 11 34 24 19 -3.07 57 0 0 37 28 58 21 15 45.6 2 223 -32 40 2 50 35 17 15 40 26 21 35 0 29 -3.21 58 0 0 38 12 43 21 15 44.6 1 223 -31 .. .. .. 35 56 23 .. .. .. 35 39 7 -3.59 59 0 0 38 59 53 21 15 44.3 0 224 -30 .. .. .. 36 38 12 .. .. .. 36 20 22 -11.14 60 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 37 22 57 .. .. .. 37 4 27 .... Uncertainty in time = +/- 2 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: UCAC4 280-132312 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 48 30.5762 DE: -34 09 16.721 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 48 30.5762 DE: -34 09 16.721 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.200) * V mag [mag]: 11.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (356) Liguria asteroid class: approx. diameter [km]: 131 approx. diameter ["]: 0.073 distance from Earth [AU]: 2.47330 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#88 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): 0.012", 0.003", 91.136° remarks: * orbital elements for (356)Liguria : Mean anomaly = 218.1037830664 deg Arg. of pericenter = 79.3627607968 deg Long. of node = 354.4947720329 deg Inclination = 8.2047666226 deg Eccentricity = 0.2415235083 Semimajor axis = 2.7546148558 AU Perihelion dist = 2.0893106119 AU Mag: H = 8.42, G = 0.15 Epoch of elements : MJD 60153.88847222 TDT (2023 Jul 28.8885) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#882023Apr24,13.35,2023,7,28,21.324419,0.327514,0.878275,-5.197056,1.938178,0.003491,0.000773,0.000001,0.000000 1.3750,-34.1636,-138.23,18.88,False UCAC4 280-132312,17.80849339,-34.1546446,0.00,11.10,0.00,0.0,0,,17.83474633,-34.1635971,2.67,0.00,0,0,0 356,Liguria,13.67,131.2,2.4733,0,0,-1.487,6.89,,6.6,0 0,217.9122,2023,7,28,79.3628,354.4948,8.2048,0.24152,2.75461,2.08931,8.41,5.0,0.15 1.068,0.0123,0.0031,91,0.0050,Known errors,-1.00,-1,-1,-1 20230728_132312,60092.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org