IOTA/IOTA-ES occultation update for (356) Liguria / TYC 7378-01276-1 event on 2023 Sep 25, 08:26 UT Visible from E Australia Summary ------- On 2023 Sep 25 UT, the 131.2 km diameter asteroid (356) Liguria will occult a 11.3 mag star in the constellation Scorpius for observers along a path across E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.17 mag to 14.39 mag (the magnitude of the asteroid) for at most 8.320 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 Sep 25, 08:19 - 2023 Sep 25, 08:32 * geocentric midpoint of event [JD]: 2460212.85137171 * magnitude of target star: 11.28 * magnitude drop [mag]: 3.17 * estimated maximum duration [s]: 8.320 * Moon: 78 % sunlit, 36° distance * Sun: 87° distance * rough path description: E Australia The occultation path -------------------- * approximate projected width [km]: 131 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.005, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.005", 0.001", 92°) * approx speed of asteroid's shadow [km/s]: 15.7662 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7378-01276-1 by 356 Liguria on 2023 Sep 25 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 43 0 0 -13 13 53 8 19 14.1 1 122 74 -13 55 53 -12 31 53 -13 58 28 -12 29 19 .... 44 0 0 -13 50 32 8 19 14.3 2 122 74 -14 32 26 -13 8 39 -14 35 1 -13 6 4 0.11 45 0 0 -14 26 47 8 19 14.6 3 122 74 -15 8 35 -13 45 0 -15 11 9 -13 42 26 0.07 46 0 0 -15 2 36 8 19 15.1 4 121 74 -15 44 17 -14 20 55 -15 46 50 -14 18 22 0.05 47 0 0 -15 37 58 8 19 15.7 5 121 74 -16 19 32 -14 56 24 -16 22 5 -14 53 51 0.04 48 0 0 -16 12 53 8 19 16.5 6 121 74 -16 54 20 -15 31 26 -16 56 53 -15 28 53 0.04 49 0 0 -16 47 19 8 19 17.5 7 121 74 -17 28 39 -16 5 59 -17 31 11 -16 3 27 0.03 50 0 0 -17 21 17 8 19 18.5 8 120 73 -18 2 30 -16 40 4 -18 5 1 -16 37 33 0.03 51 0 0 -17 54 45 8 19 19.8 10 120 73 -18 35 50 -17 13 40 -18 38 22 -17 11 9 0.03 52 0 0 -18 27 43 8 19 21.2 11 120 72 -19 8 41 -17 46 46 -19 11 11 -17 44 15 0.02 53 0 0 -19 0 10 8 19 22.7 12 119 72 -19 41 0 -18 19 21 -19 43 31 -18 16 50 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Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: TYC 7378-01276-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 55 15.3225 DE: -31 17 15.249 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 55 15.3225 DE: -31 17 15.249 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (356) Liguria asteroid class: approx. diameter [km]: 131 approx. diameter ["]: 0.058 distance from Earth [AU]: 3.14170 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#90 date of fit: 2023 Aug 23 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): 0.005", 0.001", 91.7° remarks: * orbital elements for (356)Liguria : Mean anomaly = 230.7007534037 deg Arg. of pericenter = 79.3738425974 deg Long. of node = 354.4926414489 deg Inclination = 8.2048695850 deg Eccentricity = 0.2416007922 Semimajor axis = 2.7544229008 AU Perihelion dist = 2.0889521460 AU Mag: H = 8.41, G = 0.15 Epoch of elements : MJD 60212.35138889 TDT (2023 Sep 25.3514) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#902023Aug23,8.32,2023,9,25,8.432921,-0.000995,0.003001,8.584863,2.343052,0.005784,-0.000071,0.000000,0.000000 138.7979,-31.2930,51.46,-0.81,False TYC 7378-01276-1,17.92092294,-31.2875692,0.00,11.28,0.00,0.0,0,,17.94635559,-31.2930428,3.17,0.00,0,0,0 356,Liguria,14.39,131.200,3.1417,0,0,1.875,6.56,,6.6,0 0,230.6250,2023,9,25,79.3738,354.4926,8.2049,0.24160,2.75442,2.08895,8.41,5.0,0.15 1.031,0.0047,0.0012,92,0.0048,Known errors,-1.00,0,-1,-1 20230925_1276-1,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org