IOTA/IOTA-ES occultation update for (356) Liguria / UCAC4 284-192169 event on 2023 May 10, 18:12 UT Visible from Australia Summary ------- On 2023 May 10 UT, the 131.2 km diameter asteroid (356) Liguria will occult a 11.6 mag star in the constellation Sagittarius 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 2.59 mag to 14.04 mag (the magnitude of the asteroid) for at most 24.070 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: 99 * date and approx. time of event: 2023 May 10, 17:53 - 2023 May 10, 18:31 * geocentric midpoint of event [JD]: 2460075.25870071 * magnitude of target star: 11.56 * magnitude drop [mag]: 2.59 * estimated maximum duration [s]: 24.070 * Moon: 70 % sunlit, 16° distance * Sun: 128° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 140 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.003", 82°) * approx speed of asteroid's shadow [km/s]: 5.4514 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 284-192169 by 356 Liguria on 2023 May 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 32 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -22 11 39 .. .. .. -22 22 4 .... 33 0 0 -22 4 41 18 30 50.6 1 126 -44 -21 17 23 -22 51 40 -21 6 55 -23 1 58 .... 34 0 0 -22 43 48 18 30 49.9 2 125 -45 -21 57 0 -23 30 16 -21 46 39 -23 40 28 -0.23 35 0 0 -23 21 32 18 30 48.8 3 125 -46 -22 35 14 -24 7 31 -22 24 59 -24 17 37 -0.30 36 0 0 -23 57 55 18 30 47.2 4 125 -47 -23 12 5 -24 43 27 -23 1 57 -24 53 26 -0.33 37 0 0 -24 32 59 18 30 45.2 5 124 -48 -23 47 37 -25 18 5 -23 37 34 -25 27 58 -0.34 38 0 0 -25 6 47 18 30 42.8 6 124 -49 -24 21 51 -25 51 27 -24 11 54 -26 1 15 -0.35 39 0 0 -25 39 21 18 30 40.1 7 123 -50 -24 54 49 -26 23 36 -24 44 58 -26 33 19 -0.36 40 0 0 -26 10 42 18 30 36.9 8 123 -51 -25 26 34 -26 54 33 -25 16 48 -27 4 11 -0.36 41 0 0 -26 40 52 18 30 33.5 9 123 -52 -25 57 7 -27 24 21 -25 47 27 -27 33 54 -0.37 42 0 0 -27 9 53 18 30 29.6 10 122 -52 -26 26 30 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Uncertainty in time = +/- 4 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 284-192169 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 50 54.2759 DE: -33 22 37.957 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 50 54.2759 DE: -33 22 37.957 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (356) Liguria asteroid class: approx. diameter [km]: 131 approx. diameter ["]: 0.068 distance from Earth [AU]: 2.67480 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", 81.722° remarks: * orbital elements for (356)Liguria : Mean anomaly = 201.0482272412 deg Arg. of pericenter = 79.3563474532 deg Long. of node = 354.4966623499 deg Inclination = 8.2047277292 deg Eccentricity = 0.2414425612 Semimajor axis = 2.7547956413 AU Perihelion dist = 2.0896707262 AU Mag: H = 8.42, G = 0.15 Epoch of elements : MJD 60074.75847222 TDT (2023 May 10.7585) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#882023Apr24,24.07,2023,5,10,18.208817,-0.244204,0.237329,-2.144355,-2.206612,-0.004537,0.000232,0.000001,0.000000 141.6925,-33.3493,-94.03,17.70,False UCAC4 284-192169,18.84840995,-33.3772104,0.00,11.56,0.00,0.0,0,,18.87398908,-33.3493033,2.59,0.00,0,0,0 356,Liguria,14.04,131.2,2.6748,0,0,-0.562,-7.26,,6.6,0 0,200.8847,2023,5,10,79.3563,354.4967,8.2047,0.24144,2.75480,2.08967,8.47,5.0,0.15 1.110,0.0117,0.0028,82,0.0075,Known errors,-1.00,-1,-1,-1 20230510_192169,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org