IOTA/IOTA-ES occultation update for (1436) Salonta / UCAC4 351-119654 event on 2023 Jun 23, 10:14 UT Visible from New Zealand, Australia Summary ------- On 2023 Jun 23 UT, the 58.8 km diameter asteroid (1436) Salonta will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.01 mag to 14.37 mag (the magnitude of the asteroid) for at most 4.630 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: 81 * date and approx. time of event: 2023 Jun 23, 10:07 - 2023 Jun 23, 10:21 * geocentric midpoint of event [JD]: 2460118.92665755 * magnitude of target star: 11.43 * magnitude drop [mag]: 3.01 * estimated maximum duration [s]: 4.630 * Moon: 24 % sunlit, 118° distance * Sun: 176° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 0.65 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.037, +/- 0.022) * 1 sigma uncertainty ellipse (major, minor, PA): (0.038", 0.021", 77°) * approx speed of asteroid's shadow [km/s]: 12.7127 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 351-119654 by 1436 Salonta on 2023 Jun 23 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 107 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -14 21 59 .. .. .. -14 49 2 .... 108 0 0 -14 23 44 10 21 17.0 1 110 1 -14 3 11 -14 44 21 -13 36 27 -15 11 28 .... 109 0 0 -14 46 31 10 21 16.7 2 110 0 -14 25 55 -15 7 12 -13 59 7 -15 34 24 0.57 110 0 0 -15 9 47 10 21 16.2 3 110 -1 -14 49 8 -15 30 32 -14 22 15 -15 57 49 0.61 111 0 0 -15 33 32 10 21 15.5 4 110 -2 -15 12 49 -15 54 21 -14 45 51 -16 21 42 0.62 112 0 0 -15 57 44 10 21 14.6 5 109 -3 -15 36 57 -16 18 37 -15 9 55 -16 46 3 0.63 113 0 0 -16 22 24 10 21 13.5 6 109 -4 -16 1 33 -16 43 20 -15 34 26 -17 10 51 0.64 114 0 0 -16 47 30 10 21 12.2 7 109 -5 -16 26 36 -17 8 30 -15 59 24 -17 36 6 0.64 115 0 0 -17 13 2 10 21 10.7 8 108 -6 -16 52 4 -17 34 6 -16 24 47 -18 1 48 0.65 116 0 0 -17 39 0 10 21 9.0 9 108 -8 -17 17 58 -18 0 8 -16 50 36 -18 27 55 0.65 117 0 0 -18 5 23 10 21 7.1 10 108 -9 -17 44 17 -18 26 34 -17 16 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247 -12 -53 16 47 -54 0 25 -52 48 29 -54 29 11 0.73 - 49 0 0 -53 18 53 10 7 35.3 7 246 -12 -52 57 4 -53 40 50 -52 28 40 -54 9 41 0.73 - 48 0 0 -52 58 49 10 7 34.4 6 245 -11 -52 36 55 -53 20 49 -52 8 26 -53 49 46 0.74 - 47 0 0 -52 38 18 10 7 33.6 6 244 -10 -52 16 20 -53 0 22 -51 47 46 -53 29 25 0.75 - 46 0 0 -52 17 21 10 7 32.9 5 244 -9 -51 55 19 -52 39 30 -51 26 40 -53 8 38 0.76 - 45 0 0 -51 55 58 10 7 32.2 4 243 -9 -51 33 52 -52 18 11 -51 5 8 -52 47 24 0.77 - 44 0 0 -51 34 9 10 7 31.7 4 242 -8 -51 11 59 -51 56 26 -50 43 10 -52 25 45 0.79 - 43 0 0 -51 11 54 10 7 31.2 3 241 -7 -50 49 40 -51 34 15 -50 20 46 -52 3 39 0.82 - 42 0 0 -50 49 12 10 7 30.9 2 241 -7 -50 26 55 -51 11 37 -49 57 56 -51 41 6 0.87 - 41 0 0 -50 26 5 10 7 30.6 1 240 -6 -50 3 44 -50 48 33 -49 34 40 -51 18 7 0.98 - 40 0 0 -50 2 31 10 7 30.5 1 239 -5 -49 40 6 -50 25 3 -49 10 58 -50 54 42 1.32 - 39 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -50 1 7 .. .. .. -50 30 51 .... Uncertainty in time = +/- 4 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 351-119654 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 54 08.2402 DE: -19 59 37.221 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 54 08.2402 DE: -19 59 37.221 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1436) Salonta asteroid class: approx. diameter [km]: 59 approx. diameter ["]: 0.042 distance from Earth [AU]: 1.95090 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): 0.038", 0.021", 76.538° remarks: * orbital elements for (1436)Salonta : Mean anomaly = 340.5186880388 deg Arg. of pericenter = 31.4803412318 deg Long. of node = 260.3818279152 deg Inclination = 13.8899287049 deg Eccentricity = 0.0615183813 Semimajor axis = 3.1463449634 AU Perihelion dist = 2.9527869143 AU Mag: H = 10.34, G = 0.15 Epoch of elements : MJD 60118.42652778 TDT (2023 Jun 23.4265) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,4.63,2023,6,23,10.239781,-0.188907,-0.532367,-6.762257,2.399560,0.000295,-0.000341,0.000001,0.000000 -156.0373,-19.9987,26.96,23.43,False UCAC4 351-119654,17.90228894,-19.9936724,0.00,11.43,0.00,0.0,0,,17.92573988,-19.9986616,3.01,0.00,0,0,0 1436,Salonta,14.37,58.8,1.9509,0,0,-2.162,10.81,,3.0,0 0,340.4434,2023,6,23,31.4803,260.3818,13.8899,0.06152,3.14634,2.95279,10.36,5.0,0.15 1.654,0.0380,0.0210,77,0.0272,Known errors,-1.00,-1,-1,-1 20230623_119654,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org