IOTA/IOTA-ES occultation update for (1456) Saldanha / UCAC4 347-161156 event on 2023 Jul 27, 14:02 UT Visible from New Zealand, S Australia Summary ------- On 2023 Jul 27 UT, the 43.3 km diameter asteroid (1456) Saldanha will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across New Zealand, S Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.46 mag to 15.04 mag (the magnitude of the asteroid) for at most 4.530 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: 93 * date and approx. time of event: 2023 Jul 27, 13:52 - 2023 Jul 27, 14:13 * geocentric midpoint of event [JD]: 2460153.08552896 * magnitude of target star: 11.63 * magnitude drop [mag]: 3.46 * estimated maximum duration [s]: 4.530 * Moon: 68 % sunlit, 48° distance * Sun: 158° distance * rough path description: New Zealand, S Australia The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.029, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.006", 73°) * approx speed of asteroid's shadow [km/s]: 9.5544 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 347-161156 by 1456 Saldanha on 2023 Jul 27 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 34 0 0 - 4 51 28 14 13 42.0 1 111 21 - 4 38 16 - 5 4 41 - 4 25 54 - 5 17 5 .... 35 0 0 - 5 14 33 14 13 41.7 2 111 20 - 5 1 20 - 5 27 48 - 4 48 57 - 5 40 13 0.30 36 0 0 - 5 37 56 14 13 41.2 3 110 19 - 5 24 42 - 5 51 12 - 5 12 18 - 6 3 39 0.31 37 0 0 - 6 1 36 14 13 40.4 4 110 18 - 5 48 20 - 6 14 53 - 5 35 55 - 6 27 21 0.31 38 0 0 - 6 25 32 14 13 39.4 5 110 17 - 6 12 15 - 6 38 50 - 5 59 48 - 6 51 20 0.31 39 0 0 - 6 49 44 14 13 38.1 6 110 16 - 6 36 26 - 7 3 3 - 6 23 58 - 7 15 34 0.32 40 0 0 - 7 14 11 14 13 36.6 7 110 15 - 7 0 51 - 7 27 31 - 6 48 22 - 7 40 3 0.32 41 0 0 - 7 38 52 14 13 34.9 8 110 14 - 7 25 31 - 7 52 14 - 7 13 1 - 8 4 47 0.32 42 0 0 - 8 3 47 14 13 32.9 9 110 12 - 7 50 26 - 8 17 10 - 7 37 54 - 8 29 45 0.32 43 0 0 - 8 28 56 14 13 30.7 10 110 11 - 8 15 33 - 8 42 20 - 8 3 1 - 8 54 55 0.32 44 0 0 - 8 54 17 14 13 28.2 11 109 10 - 8 40 53 - 9 7 43 - 8 28 20 - 9 20 19 0.32 45 0 0 - 9 19 51 14 13 25.5 12 109 9 - 9 6 25 - 9 33 17 - 8 53 51 - 9 45 54 0.32 46 0 0 - 9 45 36 14 13 22.6 13 109 8 - 9 32 9 - 9 59 3 - 9 19 34 -10 11 41 0.32 47 0 0 -10 11 31 14 13 19.4 15 109 7 - 9 58 4 -10 25 0 - 9 45 28 -10 37 39 0.32 48 0 0 -10 37 37 14 13 16.0 16 109 6 -10 24 8 -10 51 6 -10 11 31 -11 3 46 0.32 49 0 0 -11 3 52 14 13 12.4 17 108 5 -10 50 23 -11 17 22 -10 37 45 -11 30 3 0.32 50 0 0 -11 30 16 14 13 8.5 18 108 4 -11 16 46 -11 43 47 -11 4 7 -11 56 29 0.32 51 0 0 -11 56 48 14 13 4.4 19 108 3 -11 43 17 -12 10 20 -11 30 37 -12 23 3 0.32 52 0 0 -12 23 28 14 13 0.1 20 108 2 -12 9 56 -12 37 1 -11 57 15 -12 49 44 0.32 53 0 0 -12 50 14 14 12 55.6 21 107 1 -12 36 41 -13 3 48 -12 24 0 -13 16 32 0.32 54 0 0 -13 17 6 14 12 50.9 22 107 0 -13 3 33 -13 30 41 -12 50 51 -13 43 26 0.32 55 0 0 -13 44 4 14 12 45.9 23 107 -1 -13 30 30 -13 57 39 -13 17 47 -14 10 25 0.32 56 0 0 -14 11 7 14 12 40.8 24 107 -2 -13 57 32 -14 24 43 -13 44 48 -14 37 29 0.32 57 0 0 -14 38 13 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0 -36 35 15 13 53 6.5 16 256 -34 -36 22 11 -36 48 20 -36 9 57 -37 0 38 0.34 -144 0 0 -36 17 58 13 53 3.7 15 255 -33 -36 4 53 -36 31 5 -35 52 37 -36 43 23 0.34 -143 0 0 -36 0 20 13 53 1.0 14 255 -32 -35 47 13 -36 13 28 -35 34 56 -36 25 48 0.34 -142 0 0 -35 42 20 13 52 58.4 14 254 -31 -35 29 12 -35 55 29 -35 16 53 -36 7 51 0.35 -141 0 0 -35 23 59 13 52 56.0 13 254 -31 -35 10 49 -35 37 10 -34 58 30 -35 49 33 0.35 -140 0 0 -35 5 17 13 52 53.7 12 253 -30 -34 52 6 -35 18 30 -34 39 45 -35 30 54 0.35 -139 0 0 -34 46 14 13 52 51.6 11 252 -29 -34 33 2 -34 59 28 -34 20 39 -35 11 54 0.35 -138 0 0 -34 26 50 13 52 49.6 10 252 -28 -34 13 36 -34 40 6 -34 1 12 -34 52 32 0.35 -137 0 0 -34 7 6 13 52 47.7 9 251 -27 -33 53 50 -34 20 22 -33 41 25 -34 32 50 0.35 -136 0 0 -33 47 0 13 52 46.1 8 251 -26 -33 33 43 -34 0 18 -33 21 17 -34 12 48 0.36 -135 0 0 -33 26 34 13 52 44.5 7 250 -25 -33 13 16 -33 39 54 -33 0 48 -33 52 24 0.36 -134 0 0 -33 5 48 13 52 43.2 7 250 -25 -32 52 28 -33 19 8 -32 39 58 -33 31 41 0.37 -133 0 0 -32 44 41 13 52 42.0 6 249 -24 -32 31 19 -32 58 3 -32 18 49 -33 10 36 0.37 -132 0 0 -32 23 14 13 52 40.9 5 249 -23 -32 9 51 -32 36 37 -31 57 19 -32 49 12 0.38 -131 0 0 -32 1 27 13 52 40.1 4 248 -22 -31 48 3 -32 14 52 -31 35 30 -32 27 28 0.40 -130 0 0 -31 39 20 13 52 39.4 3 248 -21 -31 25 55 -31 52 47 -31 13 20 -32 5 24 0.43 -129 0 0 -31 16 54 13 52 38.9 2 247 -20 -31 3 27 -31 30 22 -30 50 52 -31 43 0 0.48 -128 0 0 -30 54 8 13 52 38.6 1 246 -19 -30 40 41 -31 7 38 -30 28 4 -31 20 17 0.62 -127 0 0 -30 31 4 13 52 38.5 0 246 -18 .. .. .. -30 44 34 .. .. .. -30 57 15 5.29 Uncertainty in time = +/- 4 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: UCAC4 347-161156 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 52 33.7842 DE: -20 39 13.018 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 52 33.7841 DE: -20 39 13.018 * 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: (1456) Saldanha asteroid class: approx. diameter [km]: 43 approx. diameter ["]: 0.034 distance from Earth [AU]: 1.75360 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 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): 0.030", 0.006", 73.458° remarks: * orbital elements for (1456)Saldanha : Mean anomaly = 321.9501311519 deg Arg. of pericenter = 65.5124414463 deg Long. of node = 282.4070888257 deg Inclination = 10.4393017578 deg Eccentricity = 0.2212285159 Semimajor axis = 3.2025521752 AU Perihelion dist = 2.4940563103 AU Mag: H = 11.08, G = 0.15 Epoch of elements : MJD 60152.58534722 TDT (2023 Jul 27.5853) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr24,4.53,2023,7,27,14.052695,-0.076758,-0.312336,-5.235504,1.292863,0.002082,-0.000004,0.000001,0.000000 127.7083,-20.6251,-29.14,19.18,False UCAC4 347-161156,18.87605118,-20.6536162,0.00,11.63,0.00,0.0,0,K,18.89962170,-20.6251170,3.45,0.00,0,0,0 1456,Saldanha,15.04,43.3,1.7536,0,0,-1.869,6.49,,2.2,0 0,321.8495,2023,7,27,65.5124,282.4071,10.4393,0.22123,3.20255,2.49406,11.08,5.0,0.15 1.469,0.0300,0.0057,73,0.0160,Known errors,-1.00,-1,-1,-1 20230727_161156,60092.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org