IOTA/IOTA-ES occultation update for (1436) Salonta / UCAC4 342-123059 event on 2023 May 31, 19:23 UT Visible from Australia, SW Asia Summary ------- On 2023 May 31 UT, the 58.8 km diameter asteroid (1436) Salonta will occult a 12.4 mag star in the constellation Sagittarius for observers along a path across Australia, SW Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.50 mag to 14.79 mag (the magnitude of the asteroid) for at most 5.470 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: 79 * date and approx. time of event: 2023 May 31, 19:13 - 2023 May 31, 19:33 * geocentric midpoint of event [JD]: 2460096.30828896 * magnitude of target star: 12.40 * magnitude drop [mag]: 2.50 * estimated maximum duration [s]: 5.470 * Moon: 87 % sunlit, 65° distance * Sun: 157° distance * rough path description: Australia, SW Asia The occultation path -------------------- * approximate projected width [km]: 60 * 1 sigma uncertainty interval [path widths]: +/- 0.69 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.036, +/- 0.022) * 1 sigma uncertainty ellipse (major, minor, PA): (0.037", 0.020", 75°) * approx speed of asteroid's shadow [km/s]: 10.7465 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 342-123059 by 1436 Salonta on 2023 May 31 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 15 0 0 30 19 14 19 33 41.2 0 116 -18 30 37 10 30 1 19 31 2 2 29 36 32 .... 16 0 0 29 54 11 19 33 41.1 1 116 -19 30 12 10 29 36 14 30 37 7 29 11 23 -0.02 17 0 0 29 28 41 19 33 40.7 2 117 -20 29 46 43 29 10 40 30 11 43 28 45 45 -0.08 18 0 0 29 2 42 19 33 40.2 3 117 -21 29 20 47 28 44 38 29 45 51 28 19 39 -0.11 19 0 0 28 36 15 19 33 39.6 4 117 -22 28 54 23 28 18 9 29 19 32 27 53 5 -0.13 20 0 0 28 9 22 19 33 38.7 5 118 -23 28 27 33 27 51 12 28 52 45 27 26 5 -0.14 21 0 0 27 42 1 19 33 37.7 6 118 -24 28 0 15 27 23 48 28 25 31 26 58 37 -0.14 22 0 0 27 14 14 19 33 36.4 7 119 -25 27 32 30 26 55 58 27 57 51 26 30 43 -0.15 23 0 0 26 46 0 19 33 35.0 8 119 -26 27 4 19 26 27 42 27 29 44 26 2 23 -0.15 24 0 0 26 17 20 19 33 33.4 9 120 -27 26 35 42 25 58 59 27 1 10 25 33 37 -0.16 25 0 0 25 48 15 19 33 31.6 10 120 -28 26 6 40 25 29 52 26 32 12 25 4 25 -0.16 26 0 0 25 18 45 19 33 29.6 11 121 -29 25 37 12 25 0 19 26 2 48 24 34 49 -0.16 27 0 0 24 48 50 19 33 27.4 12 121 -30 25 7 20 24 30 22 25 32 59 24 4 49 -0.16 28 0 0 24 18 32 19 33 24.9 13 122 -31 24 37 4 24 0 1 25 2 46 23 34 24 -0.16 29 0 0 23 47 50 19 33 22.3 14 122 -32 24 6 24 23 29 17 24 32 10 23 3 37 -0.17 30 0 0 23 16 45 19 33 19.5 16 122 -33 23 35 22 22 58 10 24 1 10 22 32 27 -0.17 31 0 0 22 45 18 19 33 16.5 17 123 -34 23 3 57 22 26 40 23 29 49 22 0 55 -0.17 32 0 0 22 13 30 19 33 13.2 18 123 -35 22 32 10 21 54 50 22 58 5 21 29 1 -0.17 33 0 0 21 41 20 19 33 9.8 19 124 -36 22 0 3 21 22 39 22 26 0 20 56 47 -0.17 34 0 0 21 8 51 19 33 6.1 20 124 -37 21 27 35 20 50 7 21 53 35 20 24 13 -0.17 35 0 0 20 36 2 19 33 2.3 21 124 -38 20 54 48 20 17 17 21 20 51 19 51 20 -0.17 36 0 0 20 2 55 19 32 58.2 22 125 -39 20 21 43 19 44 8 20 47 47 19 18 9 -0.17 37 0 0 19 29 29 19 32 53.9 23 125 -40 19 48 19 19 10 41 20 14 26 18 44 40 -0.17 38 0 0 18 55 47 19 32 49.3 24 125 -41 19 14 38 18 36 57 19 40 47 18 10 55 -0.17 39 0 0 18 21 49 19 32 44.6 25 126 -42 18 40 41 18 2 58 19 6 52 17 36 53 -0.17 40 0 0 17 47 36 19 32 39.7 26 126 -43 18 6 29 17 28 43 18 32 42 17 2 37 -0.17 41 0 0 17 13 8 19 32 34.5 27 126 -44 17 32 3 16 54 14 17 58 17 16 28 7 -0.17 42 0 0 16 38 27 19 32 29.1 28 127 -45 16 57 23 16 19 32 17 23 38 15 53 23 -0.17 43 0 0 16 3 33 19 32 23.5 29 127 -46 16 22 30 15 44 38 16 48 46 15 18 28 -0.17 44 0 0 15 28 28 19 32 17.8 31 127 -47 15 47 26 15 9 33 16 13 43 14 43 21 -0.18 45 0 0 14 53 13 19 32 11.7 32 128 -48 15 12 11 14 34 17 15 38 29 14 8 5 -0.18 46 0 0 14 17 48 19 32 5.5 33 128 -49 14 36 47 13 58 51 15 3 6 13 32 39 -0.18 47 0 0 13 42 15 19 31 59.1 34 128 -50 14 1 14 13 23 18 14 27 33 12 57 5 -0.18 48 0 0 13 6 35 19 31 52.5 35 129 -51 13 25 34 12 47 37 13 51 53 12 21 24 -0.18 49 0 0 12 30 48 19 31 45.7 36 129 -52 12 49 47 12 11 50 13 16 7 11 45 37 -0.18 50 0 0 11 54 56 19 31 38.7 37 129 -53 12 13 55 11 35 58 12 40 14 11 9 45 -0.18 51 0 0 11 18 59 19 31 31.5 38 130 -53 11 37 58 11 0 2 12 4 18 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28 7 -19 47 36 -0.17 174 0 0 -18 53 29 19 14 38.2 17 252 5 -18 36 47 -19 10 10 -18 13 37 -19 33 16 -0.17 175 0 0 -18 38 32 19 14 35.3 16 252 6 -18 21 47 -18 55 16 -17 58 35 -19 18 24 -0.17 176 0 0 -18 23 3 19 14 32.4 15 252 7 -18 6 16 -18 39 49 -17 43 0 -19 3 1 -0.17 177 0 0 -18 7 2 19 14 29.8 14 252 7 -17 50 13 -18 23 51 -17 26 53 -18 47 6 -0.17 178 0 0 -17 50 29 19 14 27.3 14 251 8 -17 33 37 -18 7 20 -17 10 14 -18 30 38 -0.18 179 0 0 -17 33 23 19 14 25.0 13 251 9 -17 16 29 -17 50 17 -16 53 2 -18 13 39 -0.18 180 0 0 -17 15 45 19 14 22.8 12 251 10 -16 58 48 -17 32 41 -16 35 18 -17 56 7 -0.18 -179 0 0 -16 57 35 19 14 20.8 11 250 11 -16 40 35 -17 14 34 -16 17 1 -17 38 3 -0.18 -178 0 0 -16 38 52 19 14 19.0 10 250 12 -16 21 49 -16 55 54 -15 58 12 -17 19 27 -0.18 -177 0 0 -16 19 36 19 14 17.3 9 250 13 -16 2 31 -16 36 41 -15 38 49 -17 0 18 -0.18 -176 0 0 -15 59 48 19 14 15.8 8 250 14 -15 42 40 -16 16 56 -15 18 54 -16 40 37 -0.18 -175 0 0 -15 39 28 19 14 14.5 7 249 15 -15 22 16 -15 56 38 -14 58 27 -16 20 23 -0.18 -174 0 0 -15 18 34 19 14 13.4 5 249 16 -15 1 20 -15 35 47 -14 37 26 -15 59 36 -0.17 -173 0 0 -14 57 8 19 14 12.4 4 249 17 -14 39 51 -15 14 24 -14 15 52 -15 38 17 -0.17 -172 0 0 -14 35 9 19 14 11.7 3 249 18 -14 17 49 -14 52 28 -13 53 46 -15 16 26 -0.17 -171 0 0 -14 12 37 19 14 11.1 2 248 19 -13 55 14 -14 29 59 -13 31 7 -14 54 1 -0.17 -170 0 0 -13 49 33 19 14 10.8 1 248 20 -13 32 6 -14 6 58 -13 7 55 -14 31 5 -0.16 -169 0 0 -13 25 56 19 14 10.6 0 248 21 -13 8 26 -13 43 25 -12 44 10 -14 7 35 -0.08 Uncertainty in time = +/- 5 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 342-123059 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 12 37.3025 DE: -21 38 40.214 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 12 37.3025 DE: -21 38 40.214 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1436) Salonta asteroid class: approx. diameter [km]: 59 approx. diameter ["]: 0.040 distance from Earth [AU]: 2.01220 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.037", 0.020", 74.827° remarks: * orbital elements for (1436)Salonta : Mean anomaly = 336.5354221946 deg Arg. of pericenter = 31.4689902788 deg Long. of node = 260.3817390863 deg Inclination = 13.8897616790 deg Eccentricity = 0.0615390835 Semimajor axis = 3.1464242721 AU Perihelion dist = 2.9527962060 AU Mag: H = 10.34, G = 0.15 Epoch of elements : MJD 60095.80819445 TDT (2023 May 31.8082) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,5.47,2023,5,31,19.398935,0.064954,0.148759,-5.558509,2.427881,-0.002179,-0.000212,0.000001,0.000000 93.4930,-21.6390,-111.55,21.96,False UCAC4 342-123059,18.21036179,-21.6445039,0.00,12.40,0.00,0.0,0,,18.23397364,-21.6389870,2.51,0.00,0,0,0 1436,Salonta,14.79,58.8,2.0122,0,0,-1.742,10.61,,3.0,0 0,336.3927,2023,5,31,31.4690,260.3817,13.8898,0.06154,3.14642,2.95280,10.36,5.0,0.15 1.693,0.0367,0.0203,75,0.0279,Known errors,-1.00,-1,-1,-1 20230531_123059,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org