IOTA/IOTA-ES occultation update for (1436) Salonta / UCAC4 338-136858 event on 2023 May 19, 13:40 UT Visible from New Zealand, NE Australia Summary ------- On 2023 May 19 UT, the 58.8 km diameter asteroid (1436) Salonta will occult a 12.3 mag star in the constellation Sagittarius for observers along a path across New Zealand, NE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.81 mag to 15.05 mag (the magnitude of the asteroid) for at most 7.460 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: 75 * date and approx. time of event: 2023 May 19, 13:27 - 2023 May 19, 13:53 * geocentric midpoint of event [JD]: 2460084.06972255 * magnitude of target star: 12.33 * magnitude drop [mag]: 2.81 * estimated maximum duration [s]: 7.460 * Moon: 0 % sunlit, 142° distance * Sun: 143° distance * rough path description: New Zealand, NE Australia The occultation path -------------------- * approximate projected width [km]: 63 * 1 sigma uncertainty interval [path widths]: +/- 0.75 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.034, +/- 0.021) * 1 sigma uncertainty ellipse (major, minor, PA): (0.035", 0.020", 74°) * approx speed of asteroid's shadow [km/s]: 7.8772 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 338-136858 by 1436 Salonta on 2023 May 19 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 105 0 0 10 31 50 13 53 0.0 1 113 -36 10 50 13 10 13 23 11 17 53 9 45 32 .... 106 0 0 10 6 4 13 52 59.7 2 113 -37 10 24 33 9 47 34 10 52 19 9 19 35 0.32 107 0 0 9 39 35 13 52 59.1 3 113 -38 9 58 8 9 21 0 10 26 1 8 52 55 0.33 108 0 0 9 12 23 13 52 58.2 4 113 -39 9 31 1 8 53 43 9 59 1 8 25 30 0.34 109 0 0 8 44 28 13 52 57.0 5 114 -40 9 3 10 8 25 43 9 31 17 7 57 23 0.34 110 0 0 8 15 49 13 52 55.5 6 114 -41 8 34 36 7 56 59 9 2 51 7 28 32 0.35 111 0 0 7 46 27 13 52 53.6 7 114 -42 8 5 20 7 27 33 8 33 42 6 58 58 0.35 112 0 0 7 16 23 13 52 51.4 8 114 -43 7 35 20 6 57 23 8 3 50 6 28 41 0.35 113 0 0 6 45 36 13 52 48.9 9 114 -44 7 4 38 6 26 31 7 33 15 5 57 41 0.35 114 0 0 6 14 7 13 52 46.1 10 114 -45 6 33 14 5 54 57 7 1 59 5 25 59 0.35 115 0 0 5 41 56 13 52 42.9 11 114 -46 6 1 9 5 22 41 6 30 1 4 53 35 0.35 116 0 0 5 9 3 13 52 39.4 13 114 -48 5 28 21 4 49 43 5 57 22 4 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21 37 -51 2 10 0.44 - 50 0 0 -49 46 42 13 27 50.6 3 238 17 -49 26 34 -50 6 53 -48 56 20 -50 37 25 0.46 - 49 0 0 -49 21 0 13 27 50.0 2 237 17 -49 0 45 -49 41 17 -48 30 21 -50 11 58 0.50 - 48 0 0 -48 54 35 13 27 49.6 1 236 18 -48 34 14 -49 14 59 -48 3 40 -49 45 51 0.59 - 47 0 0 -48 27 28 13 27 49.4 1 236 19 -48 7 1 -48 47 59 -47 36 17 -49 19 0 0.93 - 46 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -48 51 27 .... Uncertainty in time = +/- 7 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 338-136858 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 19 44.0486 DE: -22 29 23.602 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 19 44.0486 DE: -22 29 23.602 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1436) Salonta asteroid class: approx. diameter [km]: 59 approx. diameter ["]: 0.039 distance from Earth [AU]: 2.09990 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): 0.035", 0.020", 73.842° remarks: * orbital elements for (1436)Salonta : Mean anomaly = 334.3794729774 deg Arg. of pericenter = 31.4636047728 deg Long. of node = 260.3817170254 deg Inclination = 13.8896818070 deg Eccentricity = 0.0615487178 Semimajor axis = 3.1464615189 AU Perihelion dist = 2.9528008468 AU Mag: H = 10.34, G = 0.15 Epoch of elements : MJD 60083.56958333 TDT (2023 May 19.5696) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,7.46,2023,5,19,13.673341,-0.191986,-0.301431,-3.750049,2.388528,-0.003383,-0.000195,0.000001,0.000000 -166.7812,-22.4803,-25.97,19.79,False UCAC4 338-136858,18.32890238,-22.4898894,0.00,12.33,0.00,0.0,0,,18.35256893,-22.4803374,2.81,0.00,0,0,0 1436,Salonta,15.05,58.8,2.0999,0,0,-1.133,10.01,,3.0,0 0,334.2789,2023,5,19,31.4636,260.3817,13.8897,0.06155,3.14646,2.95280,10.36,5.0,0.15 1.754,0.0347,0.0197,74,0.0291,Known errors,-1.00,-1,-1,-1 20230519_136858,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org