IOTA/IOTA-ES occultation update for (356) Liguria / UCAC4 278-203730 event on 2023 Jun 06, 03:12 UT Visible from South America, Africa Summary ------- On 2023 Jun 06 UT, the 131.2 km diameter asteroid (356) Liguria will occult a 12.0 mag star in the constellation Sagittarius for observers along a path across South America, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.84 mag to 13.57 mag (the magnitude of the asteroid) for at most 10.240 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 Jun 06, 03:04 - 2023 Jun 06, 03:20 * geocentric midpoint of event [JD]: 2460101.63368537 * magnitude of target star: 11.95 * magnitude drop [mag]: 1.84 * estimated maximum duration [s]: 10.240 * Moon: 95 % sunlit, 7° distance * Sun: 155° distance * rough path description: South America, Africa The occultation path -------------------- * approximate projected width [km]: 138 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.003", 84°) * approx speed of asteroid's shadow [km/s]: 12.8126 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 278-203730 by 356 Liguria on 2023 Jun 6 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 -112 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 4 9 38 .... -111 0 0 4 17 48 3 20 24.8 1 125 -25 5 3 31 3 32 19 5 7 39 3 28 14 .... -110 0 0 3 36 41 3 20 24.5 2 125 -26 4 22 13 2 51 23 4 26 20 2 47 20 -0.14 -109 0 0 2 56 4 3 20 24.0 3 125 -27 3 41 25 2 10 58 3 45 30 2 6 55 -0.22 -108 0 0 2 15 58 3 20 23.3 4 125 -29 3 1 8 1 31 4 3 5 12 1 27 2 -0.25 -107 0 0 1 36 25 3 20 22.4 6 125 -30 2 21 22 0 51 42 2 25 26 0 47 41 -0.27 -106 0 0 0 57 24 3 20 21.2 7 125 -31 1 42 10 0 12 53 1 46 12 0 8 53 -0.28 -105 0 0 0 18 57 3 20 19.9 8 125 -32 1 3 31 - 0 25 23 1 7 32 - 0 29 21 -0.29 -104 0 0 - 0 18 55 3 20 18.3 9 125 -33 0 25 26 - 1 3 3 0 29 27 - 1 7 1 -0.30 -103 0 0 - 0 56 13 3 20 16.5 10 125 -35 - 0 12 3 - 1 40 9 - 0 8 4 - 1 44 6 -0.30 -102 0 0 - 1 32 54 3 20 14.5 11 125 -36 - 0 48 56 - 2 16 39 - 0 44 58 - 2 20 34 -0.31 -101 0 0 - 2 8 59 3 20 12.3 13 125 -37 - 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76 0 0 -13 40 27 3 18 26.3 39 124 -64 -13 0 58 -14 19 47 -12 57 24 -14 23 19 -0.32 - 75 0 0 -13 59 35 3 18 20.5 40 124 -65 -13 20 14 -14 38 48 -13 16 41 -14 42 19 -0.32 - 74 0 0 -14 18 5 3 18 14.6 41 124 -66 -13 38 51 -14 57 10 -13 35 19 -15 0 40 -0.32 - 73 0 0 -14 35 56 3 18 8.6 42 124 -67 -13 56 49 -15 14 54 -13 53 18 -15 18 23 -0.32 - 72 0 0 -14 53 9 3 18 2.5 43 124 -68 -14 14 9 -15 31 59 -14 10 38 -15 35 29 -0.32 - 71 0 0 -15 9 44 3 17 56.4 44 124 -69 -14 30 51 -15 48 28 -14 27 20 -15 51 56 -0.32 - 70 0 0 -15 25 40 3 17 50.2 45 124 -70 -14 46 54 -16 4 18 -14 43 24 -16 7 46 -0.32 - 69 0 0 -15 41 0 3 17 43.9 46 124 -71 -15 2 20 -16 19 31 -14 58 50 -16 22 58 -0.32 - 68 0 0 -15 55 41 3 17 37.5 47 124 -71 -15 17 7 -16 34 6 -15 13 38 -16 37 33 -0.32 - 67 0 0 -16 9 45 3 17 31.1 47 124 -72 -15 31 17 -16 48 5 -15 27 49 -16 51 31 -0.32 - 66 0 0 -16 23 12 3 17 24.6 48 124 -73 -15 44 50 -17 1 26 -15 41 22 -17 4 52 -0.32 - 65 0 0 -16 36 2 3 17 18.0 49 124 -74 -15 57 45 -17 14 11 -15 54 18 -17 17 37 -0.32 - 64 0 0 -16 48 16 3 17 11.4 50 124 -75 -16 10 3 -17 26 19 -16 6 37 -17 29 44 -0.32 - 63 0 0 -16 59 52 3 17 4.7 51 125 -76 -16 21 45 -17 37 51 -16 18 19 -17 41 15 -0.32 - 62 0 0 -17 10 52 3 16 58.0 52 125 -77 -16 32 49 -17 48 46 -16 29 24 -17 52 10 -0.32 - 61 0 0 -17 21 15 3 16 51.1 53 125 -78 -16 43 17 -17 59 5 -16 39 52 -18 2 29 -0.32 - 60 0 0 -17 31 3 3 16 44.3 54 125 -79 -16 53 9 -18 8 49 -16 49 44 -18 12 12 -0.32 - 59 0 0 -17 40 14 3 16 37.3 54 125 -80 -17 2 24 -18 17 56 -16 58 59 -18 21 19 -0.32 - 58 0 0 -17 48 49 3 16 30.4 55 126 -81 -17 11 2 -18 26 27 -17 7 38 -18 29 50 -0.32 - 57 0 0 -17 56 48 3 16 23.3 56 126 -81 -17 19 5 -18 34 23 -17 15 41 -18 37 46 -0.32 - 56 0 0 -18 4 12 3 16 16.3 57 126 -82 -17 26 32 -18 41 44 -17 23 8 -18 45 6 -0.32 - 55 0 0 -18 11 0 3 16 9.1 58 127 -83 -17 33 23 -18 48 29 -17 29 59 -18 51 51 -0.32 - 54 0 0 -18 17 12 3 16 1.9 59 127 -84 -17 39 38 -18 54 39 -17 36 14 -18 58 0 -0.32 - 53 0 0 -18 22 49 3 15 54.7 59 128 -84 -17 45 17 -19 0 13 -17 41 54 -19 3 35 -0.32 - 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4 8 15 - 5 33 13 - 4 4 25 - 5 37 1 -0.33 10 0 0 - 4 18 21 3 7 32.5 48 220 -32 - 3 35 35 - 5 0 54 - 3 31 44 - 5 4 44 -0.33 11 0 0 - 3 45 16 3 7 25.0 47 220 -31 - 3 2 19 - 4 28 0 - 2 58 27 - 4 31 50 -0.33 12 0 0 - 3 11 34 3 7 17.7 46 221 -30 - 2 28 27 - 3 54 29 - 2 24 33 - 3 58 21 -0.33 13 0 0 - 2 37 18 3 7 10.4 45 221 -28 - 1 53 59 - 3 20 24 - 1 50 5 - 3 24 16 -0.33 14 0 0 - 2 2 26 3 7 3.2 44 221 -27 - 1 18 56 - 2 45 43 - 1 15 1 - 2 49 36 -0.33 15 0 0 - 1 26 59 3 6 56.2 43 222 -26 - 0 43 18 - 2 10 27 - 0 39 22 - 2 14 21 -0.33 16 0 0 - 0 50 58 3 6 49.2 41 222 -25 - 0 7 7 - 1 34 37 - 0 3 9 - 1 38 32 -0.33 17 0 0 - 0 14 24 3 6 42.4 40 222 -24 0 29 39 - 0 58 14 0 33 37 - 1 2 10 -0.33 18 0 0 0 22 43 3 6 35.7 39 222 -23 1 6 57 - 0 21 18 1 10 56 - 0 25 15 -0.33 19 0 0 1 0 22 3 6 29.1 38 223 -22 1 44 47 0 16 11 1 48 48 0 12 13 -0.33 20 0 0 1 38 33 3 6 22.6 37 223 -21 2 23 9 0 54 11 2 27 11 0 50 12 -0.33 21 0 0 2 17 15 3 6 16.3 36 223 -19 3 2 2 1 32 41 3 6 4 1 28 42 -0.33 22 0 0 2 56 26 3 6 10.2 35 223 -18 3 41 24 2 11 42 3 45 27 2 7 41 -0.33 23 0 0 3 36 6 3 6 4.2 34 224 -17 4 21 15 2 51 12 4 25 19 2 47 10 -0.34 24 0 0 4 16 15 3 5 58.3 32 224 -16 5 1 34 3 31 10 5 5 39 3 27 7 -0.34 25 0 0 4 56 50 3 5 52.6 31 224 -15 5 42 20 4 11 35 5 46 26 4 7 32 -0.34 26 0 0 5 37 52 3 5 47.1 30 224 -14 6 23 32 4 52 27 6 27 39 4 48 22 -0.34 27 0 0 6 19 18 3 5 41.7 29 225 -12 7 5 8 5 33 43 7 9 17 5 29 38 -0.34 28 0 0 7 1 8 3 5 36.6 28 225 -11 7 47 9 6 15 24 7 51 18 6 11 17 -0.34 29 0 0 7 43 21 3 5 31.6 27 225 -10 8 29 31 6 57 27 8 33 41 6 53 20 -0.34 30 0 0 8 25 55 3 5 26.8 25 225 -9 9 12 14 7 39 51 9 16 25 7 35 43 -0.34 31 0 0 9 8 49 3 5 22.2 24 225 -8 9 55 17 8 22 36 9 59 29 8 18 27 -0.34 32 0 0 9 52 1 3 5 17.8 23 226 -7 10 38 38 9 5 39 10 42 51 9 1 30 -0.34 33 0 0 10 35 30 3 5 13.6 22 226 -5 11 22 16 9 49 0 11 26 29 9 44 50 -0.34 34 0 0 11 19 15 3 5 9.7 21 226 -4 12 6 9 10 32 37 12 10 23 10 28 26 -0.34 35 0 0 12 3 14 3 5 5.9 19 226 -3 12 50 16 11 16 28 12 54 30 11 12 16 -0.34 36 0 0 12 47 25 3 5 2.4 18 227 -2 13 34 34 12 0 32 13 38 50 11 56 19 -0.34 37 0 0 13 31 47 3 4 59.0 17 227 -1 14 19 3 12 44 47 14 23 19 12 40 34 -0.34 38 0 0 14 16 18 3 4 55.9 16 227 1 15 3 41 13 29 11 15 7 58 13 24 58 -0.34 39 0 0 15 0 56 3 4 53.0 15 227 2 15 48 26 14 13 44 15 52 43 14 9 29 -0.34 40 0 0 15 45 41 3 4 50.4 13 228 3 16 33 16 14 58 22 16 37 34 14 54 8 -0.34 41 0 0 16 30 29 3 4 48.0 12 228 4 17 18 9 15 43 5 17 22 28 15 38 50 -0.34 42 0 0 17 15 19 3 4 45.8 11 228 5 18 3 5 16 27 51 18 7 23 16 23 35 -0.34 43 0 0 18 0 10 3 4 43.8 10 229 6 18 48 0 17 12 38 18 52 19 17 8 22 -0.34 44 0 0 18 45 0 3 4 42.1 9 229 8 19 32 53 17 57 23 19 37 12 17 53 7 -0.34 45 0 0 19 29 46 3 4 40.6 7 229 9 20 17 42 18 42 6 20 22 2 18 37 50 -0.34 46 0 0 20 14 27 3 4 39.3 6 230 10 21 2 26 19 26 45 21 6 46 19 22 28 -0.34 47 0 0 20 59 2 3 4 38.2 5 230 11 21 47 3 20 11 18 21 51 23 20 7 1 -0.34 48 0 0 21 43 27 3 4 37.4 4 230 12 22 31 30 20 55 42 22 35 50 20 51 25 -0.34 49 0 0 22 27 43 3 4 36.8 3 231 13 23 15 46 21 39 57 23 20 7 21 35 39 -0.34 50 0 0 23 11 46 3 4 36.4 1 231 14 23 59 50 22 24 0 24 4 10 22 19 42 -0.34 51 0 0 23 55 36 3 4 36.3 0 232 15 .. .. .. 23 7 49 .. .. .. 23 3 32 -0.33 Uncertainty in time = +/- 2 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 278-203730 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 36 32.5662 DE: -34 33 45.348 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 36 32.5662 DE: -34 33 45.348 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (356) Liguria asteroid class: approx. diameter [km]: 131 approx. diameter ["]: 0.075 distance from Earth [AU]: 2.42800 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): 0.013", 0.003", 83.756° remarks: * orbital elements for (356)Liguria : Mean anomaly = 206.7330570583 deg Arg. of pericenter = 79.3581018336 deg Long. of node = 354.4960228642 deg Inclination = 8.2047348645 deg Eccentricity = 0.2414660534 Semimajor axis = 2.7547429929 AU Perihelion dist = 2.0895660743 AU Mag: H = 8.42, G = 0.15 Epoch of elements : MJD 60101.13368056 TDT (2023 Jun 06.1337) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#882023Apr24,10.24,2023,6,6,3.208449,-0.062531,0.296293,-7.075689,-1.494410,-0.002272,0.000879,0.000001,0.000000 -22.8806,-34.5428,131.53,22.62,False UCAC4 278-203730,18.60904616,-34.5625966,0.00,11.95,0.00,0.0,4,,18.63518605,-34.5428036,1.84,0.00,0,0,0 356,Liguria,13.57,131.2,2.4280,0,0,-2.074,-5.41,,6.6,0 0,206.7042,2023,6,6,79.3581,354.4960,8.2047,0.24147,2.75474,2.08957,8.47,5.0,0.15 1.045,0.0130,0.0031,84,0.0034,Known errors,-1.00,-1,-1,-1 20230606_203730,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org