IOTA/IOTA-ES occultation update for (679) Pax / UCAC4 449-063487 event on 2023 Jun 20, 02:39 UT Visible from Africa, South America Summary ------- On 2023 Jun 20 UT, the 55.9 km diameter asteroid (679) Pax will occult a 11.5 mag star in the constellation Ophiuchus for observers along a path across Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.10 mag to 13.44 mag (the magnitude of the asteroid) for at most 3.660 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: 86 * date and approx. time of event: 2023 Jun 20, 02:32 - 2023 Jun 20, 02:46 * geocentric midpoint of event [JD]: 2460115.61081296 * magnitude of target star: 11.51 * magnitude drop [mag]: 2.10 * estimated maximum duration [s]: 3.660 * Moon: 4 % sunlit, 133° distance * Sun: 152° distance * rough path description: Africa, South America The occultation path -------------------- * approximate projected width [km]: 60 * 1 sigma uncertainty interval [path widths]: +/- 0.59 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.021) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.020", 111°) * approx speed of asteroid's shadow [km/s]: 15.2813 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 449-063487 by 679 Pax on 2023 Jun 20 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 -147 0 0 -42 48 23 2 46 2.9 0 90 -5 -42 32 11 -43 4 36 -42 13 9 -43 23 44 .... -146 0 0 -42 48 28 2 46 2.8 1 90 -6 -42 32 17 -43 4 41 -42 13 15 -43 23 50 0.22 -145 0 0 -42 48 16 2 46 2.7 2 89 -6 -42 32 4 -43 4 29 -42 13 2 -43 23 37 0.30 -144 0 0 -42 47 45 2 46 2.5 2 88 -7 -42 31 33 -43 3 58 -42 12 31 -43 23 7 0.32 -143 0 0 -42 46 56 2 46 2.2 3 88 -7 -42 30 44 -43 3 10 -42 11 42 -43 22 18 0.34 -142 0 0 -42 45 49 2 46 1.9 4 87 -8 -42 29 37 -43 2 3 -42 10 34 -43 21 12 0.35 -141 0 0 -42 44 24 2 46 1.5 5 86 -9 -42 28 11 -43 0 38 -42 9 8 -43 19 47 0.35 -140 0 0 -42 42 40 2 46 1.0 5 86 -9 -42 26 28 -42 58 55 -42 7 25 -43 18 5 0.36 -139 0 0 -42 40 39 2 46 0.4 6 85 -10 -42 24 26 -42 56 54 -42 5 22 -43 16 4 0.36 -138 0 0 -42 38 20 2 45 59.8 7 84 -11 -42 22 6 -42 54 35 -42 3 2 -43 13 46 0.36 -137 0 0 -42 35 42 2 45 59.1 7 84 -11 -42 19 28 -42 51 58 -42 0 24 -43 11 9 0.37 -136 0 0 -42 32 47 2 45 58.3 8 83 -12 -42 16 32 -42 49 3 -41 57 27 -43 8 15 0.37 -135 0 0 -42 29 33 2 45 57.4 9 82 -13 -42 13 18 -42 45 50 -41 54 12 -43 5 2 0.37 -134 0 0 -42 26 1 2 45 56.5 10 81 -13 -42 9 46 -42 42 19 -41 50 40 -43 1 32 0.37 -133 0 0 -42 22 12 2 45 55.5 10 81 -14 -42 5 56 -42 38 30 -41 46 48 -42 57 43 0.37 -132 0 0 -42 18 4 2 45 54.4 11 80 -15 -42 1 47 -42 34 23 -41 42 39 -42 53 37 0.37 -131 0 0 -42 13 38 2 45 53.3 12 79 -15 -41 57 21 -42 29 57 -41 38 12 -42 49 13 0.37 -130 0 0 -42 8 54 2 45 52.0 13 79 -16 -41 52 36 -42 25 14 -41 33 26 -42 44 31 0.37 -129 0 0 -42 3 52 2 45 50.7 13 78 -17 -41 47 33 -42 20 13 -41 28 23 -42 39 30 0.38 -128 0 0 -41 58 32 2 45 49.3 14 77 -18 -41 42 12 -42 14 54 -41 23 1 -42 34 12 0.38 -127 0 0 -41 52 54 2 45 47.9 15 77 -18 -41 36 33 -42 9 17 -41 17 21 -42 28 36 0.38 -126 0 0 -41 46 58 2 45 46.3 16 76 -19 -41 30 36 -42 3 21 -41 11 23 -42 22 42 0.38 -125 0 0 -41 40 44 2 45 44.7 16 75 -20 -41 24 21 -41 57 8 -41 5 7 -42 16 29 0.38 -124 0 0 -41 34 11 2 45 43.0 17 75 -20 -41 17 48 -41 50 37 -40 58 32 -42 9 59 0.38 -123 0 0 -41 27 21 2 45 41.3 18 74 -21 -41 10 56 -41 43 47 -40 51 40 -42 3 11 0.38 -122 0 0 -41 20 13 2 45 39.4 19 73 -22 -41 3 47 -41 36 40 -40 44 29 -41 56 5 0.38 -121 0 0 -41 12 46 2 45 37.5 19 73 -22 -40 56 20 -41 29 15 -40 37 0 -41 48 41 0.38 -120 0 0 -41 5 2 2 45 35.5 20 72 -23 -40 48 34 -41 21 31 -40 29 13 -41 40 59 0.38 -119 0 0 -40 56 59 2 45 33.4 21 71 -24 -40 40 30 -41 13 30 -40 21 8 -41 32 58 0.38 -118 0 0 -40 48 38 2 45 31.3 22 71 -25 -40 32 8 -41 5 10 -40 12 45 -41 24 40 0.38 -117 0 0 -40 40 0 2 45 29.0 22 70 -25 -40 23 29 -40 56 33 -40 4 4 -41 16 4 0.38 -116 0 0 -40 31 3 2 45 26.7 23 69 -26 -40 14 31 -40 47 37 -39 55 5 -41 7 10 0.38 -115 0 0 -40 21 48 2 45 24.3 24 68 -27 -40 5 15 -40 38 24 -39 45 47 -40 57 58 0.38 -114 0 0 -40 12 16 2 45 21.8 25 68 -27 -39 55 41 -40 28 52 -39 36 12 -40 48 28 0.38 -113 0 0 -40 2 25 2 45 19.3 25 67 -28 -39 45 49 -40 19 3 -39 26 18 -40 38 40 0.38 -112 0 0 -39 52 16 2 45 16.6 26 66 -29 -39 35 39 -40 8 56 -39 16 7 -40 28 35 0.38 -111 0 0 -39 41 50 2 45 13.9 27 66 -30 -39 25 11 -39 58 30 -39 5 38 -40 18 11 0.38 -110 0 0 -39 31 5 2 45 11.1 28 65 -30 -39 14 25 -39 47 47 -38 54 50 -40 7 29 0.38 -109 0 0 -39 20 3 2 45 8.2 28 64 -31 -39 3 21 -39 36 46 -38 43 45 -39 56 30 0.38 -108 0 0 -39 8 42 2 45 5.2 29 64 -32 -38 52 0 -39 25 27 -38 32 22 -39 45 13 0.38 -107 0 0 -38 57 4 2 45 2.2 30 63 -33 -38 40 20 -39 13 50 -38 20 40 -39 33 37 0.38 -106 0 0 -38 45 9 2 44 59.1 31 62 -33 -38 28 23 -39 1 56 -38 8 42 -39 21 45 0.39 -105 0 0 -38 32 55 2 44 55.8 32 61 -34 -38 16 8 -38 49 44 -37 56 25 -39 9 34 0.39 -104 0 0 -38 20 24 2 44 52.5 32 61 -35 -38 3 35 -38 37 14 -37 43 51 -38 57 6 0.39 -103 0 0 -38 7 35 2 44 49.1 33 60 -36 -37 50 45 -38 24 27 -37 30 59 -38 44 20 0.39 -102 0 0 -37 54 29 2 44 45.6 34 59 -36 -37 37 37 -38 11 22 -37 17 49 -38 31 17 0.39 -101 0 0 -37 41 5 2 44 42.1 35 58 -37 -37 24 12 -37 57 59 -37 4 22 -38 17 57 0.39 -100 0 0 -37 27 24 2 44 38.4 35 58 -38 -37 10 29 -37 44 20 -36 50 38 -38 4 18 0.39 - 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4 7 13 0.39 4 0 0 - 3 17 55 2 34 13.8 32 272 -45 - 3 1 20 - 3 34 32 - 2 41 52 - 3 54 8 0.39 5 0 0 - 3 5 14 2 34 9.7 31 272 -44 - 2 48 40 - 3 21 49 - 2 29 12 - 3 41 23 0.39 6 0 0 - 2 52 53 2 34 5.8 30 271 -43 - 2 36 20 - 3 9 27 - 2 16 54 - 3 29 0 0.39 7 0 0 - 2 40 54 2 34 1.9 29 271 -42 - 2 24 22 - 2 57 27 - 2 4 58 - 3 16 59 0.39 8 0 0 - 2 29 16 2 33 58.2 28 271 -41 - 2 12 46 - 2 45 48 - 1 53 22 - 3 5 19 0.39 9 0 0 - 2 18 1 2 33 54.5 27 271 -40 - 2 1 31 - 2 34 32 - 1 42 9 - 2 54 1 0.39 10 0 0 - 2 7 7 2 33 51.0 26 271 -39 - 1 50 39 - 2 23 37 - 1 31 17 - 2 43 5 0.39 11 0 0 - 1 56 35 2 33 47.6 25 271 -38 - 1 40 8 - 2 13 4 - 1 20 48 - 2 32 31 0.39 12 0 0 - 1 46 26 2 33 44.4 24 270 -37 - 1 30 0 - 2 2 54 - 1 10 41 - 2 22 20 0.39 13 0 0 - 1 36 39 2 33 41.3 23 270 -36 - 1 20 14 - 1 53 6 - 1 0 56 - 2 12 31 0.39 14 0 0 - 1 27 15 2 33 38.2 22 270 -35 - 1 10 50 - 1 43 41 - 0 51 34 - 2 3 4 0.39 15 0 0 - 1 18 13 2 33 35.4 21 270 -34 - 1 1 50 - 1 34 39 - 0 42 34 - 1 54 1 0.39 16 0 0 - 1 9 35 2 33 32.6 20 270 -33 - 0 53 12 - 1 25 59 - 0 33 57 - 1 45 21 0.39 17 0 0 - 1 1 19 2 33 30.0 19 270 -32 - 0 44 57 - 1 17 43 - 0 25 43 - 1 37 3 0.39 18 0 0 - 0 53 27 2 33 27.5 18 270 -31 - 0 37 6 - 1 9 50 - 0 17 53 - 1 29 9 0.39 19 0 0 - 0 45 58 2 33 25.1 17 270 -30 - 0 29 37 - 1 2 20 - 0 10 25 - 1 21 39 0.40 20 0 0 - 0 38 52 2 33 22.9 16 270 -29 - 0 22 32 - 0 55 14 - 0 3 21 - 1 14 32 0.40 21 0 0 - 0 32 10 2 33 20.7 15 270 -28 - 0 15 51 - 0 48 31 0 3 20 - 1 7 48 0.40 22 0 0 - 0 25 51 2 33 18.7 14 270 -28 - 0 9 33 - 0 42 12 0 9 37 - 1 1 28 0.40 23 0 0 - 0 19 56 2 33 16.9 13 270 -27 - 0 3 38 - 0 36 16 0 15 31 - 0 55 32 0.40 24 0 0 - 0 14 25 2 33 15.2 12 270 -26 0 1 52 - 0 30 45 0 21 1 - 0 50 0 0.40 25 0 0 - 0 9 18 2 33 13.6 11 270 -25 0 6 59 - 0 25 37 0 26 7 - 0 44 52 0.40 26 0 0 - 0 4 35 2 33 12.1 10 270 -24 0 11 41 - 0 20 54 0 30 49 - 0 40 8 0.40 27 0 0 - 0 0 16 2 33 10.8 9 270 -23 0 16 0 - 0 16 34 0 35 7 - 0 35 48 0.41 28 0 0 0 3 38 2 33 9.6 8 270 -22 0 19 54 - 0 12 39 0 39 1 - 0 31 52 0.41 29 0 0 0 7 9 2 33 8.5 7 270 -21 0 23 24 - 0 9 8 0 42 31 - 0 28 21 0.41 30 0 0 0 10 15 2 33 7.6 6 270 -20 0 26 30 - 0 6 2 0 45 36 - 0 25 15 0.42 31 0 0 0 12 56 2 33 6.8 5 270 -19 0 29 11 - 0 3 20 0 48 17 - 0 22 33 0.42 32 0 0 0 15 14 2 33 6.2 4 270 -18 0 31 28 - 0 1 3 0 50 34 - 0 20 15 0.43 33 0 0 0 17 6 2 33 5.7 3 270 -17 0 33 21 0 0 50 0 52 26 - 0 18 22 0.45 34 0 0 0 18 34 2 33 5.3 2 270 -16 0 34 49 0 2 18 0 53 54 - 0 16 54 0.47 35 0 0 0 19 37 2 33 5.0 1 270 -16 0 35 52 0 3 21 0 54 57 - 0 15 51 0.54 36 0 0 0 20 16 2 33 4.9 0 270 -15 0 36 30 0 4 0 0 55 36 - 0 15 12 0.98 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 449-063487 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 49 24.5657 DE: -00 14 35.297 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 49 24.5657 DE: -00 14 35.297 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (679) Pax asteroid class: Barbarian approx. diameter [km]: 56 approx. diameter ["]: 0.041 distance from Earth [AU]: 1.89710 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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): 0.028", 0.020", 110.534° remarks: * orbital elements for (679)Pax : Mean anomaly = 268.7442621742 deg Arg. of pericenter = 267.0922319278 deg Long. of node = 112.0853385428 deg Inclination = 24.4062124853 deg Eccentricity = 0.3097591807 Semimajor axis = 2.5868347315 AU Perihelion dist = 1.7855389245 AU Mag: H = 9.13, G = 0.15 Epoch of elements : MJD 60115.11076389 TDT (2023 Jun 20.1108) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,3.66,2023,6,20,2.659511,0.131813,-0.335337,-8.027310,-3.155382,0.001407,-0.002203,0.000001,0.000000 -55.2943,-0.2841,140.48,23.43,False UCAC4 449-063487,16.82349048,-0.2431381,0.00,11.51,0.00,0.0,0,,16.84378461,-0.2841058,2.10,0.00,0,0,0 679,Pax,13.44,55.9,1.8971,0,0,-2.480,-14.63,,3.0,0 0,268.7180,2023,6,20,267.0922,112.0853,24.4062,0.30976,2.58683,1.78554,9.15,5.0,0.15 1.589,0.0280,0.0200,111,0.0239,Known errors,-1.00,-1,-1,-1 20230620_063487,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org