IOTA/IOTA-ES occultation update for (469506) 2003 FF128 / UCAC4 339-086245 event on 2023 Apr 19, 07:01 UT Visible from Summary ------- On 2023 Apr 19 UT, the 151.3 km diameter asteroid (469506) 2003 FF128 will occult a 14.9 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.00 mag to 21.94 mag (the magnitude of the asteroid) for at most 11.420 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: 4 * date and approx. time of event: 2023 Apr 19, 06:55 - 2023 Apr 19, 07:11 * geocentric midpoint of event [JD]: 2460053.79410171 * magnitude of target star: 14.94 * magnitude drop [mag]: 7.00 * estimated maximum duration [s]: 11.420 * Moon: 1 % sunlit, 121° distance * Sun: 131° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 152 * 1 sigma uncertainty interval [path widths]: +/- 14.68 * 1 sigma uncertainty interval [seconds]: +/- 363.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.217, +/- 0.103) * 1 sigma uncertainty ellipse (major, minor, PA): (0.218", 0.101", 97°) * approx speed of asteroid's shadow [km/s]: 13.2467 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 339-086245 by 469506 2003 FF128 on 2023 Apr 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 -151 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. - 8 21 39 .... -150 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. - 8 46 39 .... -149 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. - 9 11 45 .... -148 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. - 9 36 56 .... -147 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -10 2 11 .... -146 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -10 27 30 .... -145 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -10 52 53 .... -144 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -11 18 18 .... -143 0 0 10 56 51 7 11 28.3 1 113 -49 11 41 49 10 11 58 .. .. .. -11 43 45 .... -142 0 0 10 31 50 7 11 28.2 2 113 -50 11 16 48 9 46 56 .. .. .. -12 9 13 0.00 -141 0 0 10 6 43 7 11 27.8 3 113 -51 10 51 42 9 21 49 .. .. .. -12 34 42 -0.05 -140 0 0 9 41 32 7 11 27.4 4 113 -52 10 26 32 8 56 37 .. .. .. -13 0 11 -0.08 -139 0 0 9 16 17 7 11 26.7 5 114 -53 10 1 18 8 31 22 .. .. .. -13 25 39 -0.09 -138 0 0 8 50 59 7 11 25.9 6 114 -54 9 36 0 8 6 4 .. .. .. -13 51 6 -0.10 -137 0 0 8 25 39 7 11 24.9 7 114 -55 9 10 40 7 40 43 .. .. .. -14 16 32 -0.10 -136 0 0 8 0 17 7 11 23.7 8 114 -56 8 45 18 7 15 20 .. .. .. -14 41 54 -0.11 -135 0 0 7 34 53 7 11 22.3 9 114 -57 8 19 54 6 49 57 .. .. .. -15 7 14 -0.11 -134 0 0 7 9 28 7 11 20.8 10 114 -58 7 54 29 6 24 32 .. .. .. -15 32 30 -0.11 -133 0 0 6 44 4 7 11 19.2 11 114 -59 7 29 4 5 59 8 30 52 24 -15 57 42 -0.11 -132 0 0 6 18 40 7 11 17.3 12 115 -60 7 3 40 5 33 45 30 26 42 -16 22 49 -0.11 -131 0 0 5 53 17 7 11 15.3 13 115 -62 6 38 16 5 8 23 30 0 56 -16 47 50 -0.12 -130 0 0 5 27 56 7 11 13.1 14 115 -63 6 12 54 4 43 3 29 35 5 -17 12 46 -0.12 -129 0 0 5 2 37 7 11 10.8 15 115 -64 5 47 34 4 17 45 29 9 12 -17 37 35 -0.12 -128 0 0 4 37 22 7 11 8.3 17 115 -65 5 22 18 3 52 31 28 43 16 -18 2 17 -0.12 -127 0 0 4 12 10 7 11 5.6 18 115 -66 4 57 4 3 27 20 28 17 19 -18 26 51 -0.12 -126 0 0 3 47 2 7 11 2.8 19 115 -67 4 31 55 3 2 14 27 51 20 -18 51 17 -0.12 -125 0 0 3 21 59 7 10 59.8 20 115 -68 4 6 51 2 37 12 27 25 21 -19 15 34 -0.12 -124 0 0 2 57 1 7 10 56.7 21 115 -69 3 41 51 2 12 16 26 59 23 -19 39 43 -0.12 -123 0 0 2 32 10 7 10 53.4 22 115 -70 3 16 58 1 47 26 26 33 25 -20 3 41 -0.12 -122 0 0 2 7 25 7 10 50.0 23 115 -71 2 52 11 1 22 43 26 7 30 -20 27 29 -0.12 -121 0 0 1 42 47 7 10 46.4 24 115 -72 2 27 31 0 58 8 25 41 37 -20 51 7 -0.12 -120 0 0 1 18 17 7 10 42.6 25 116 -73 2 2 59 0 33 39 25 15 47 -21 14 34 -0.12 -119 0 0 0 53 54 7 10 38.7 26 116 -74 1 38 34 0 9 20 24 50 1 -21 37 49 -0.12 -118 0 0 0 29 41 7 10 34.7 27 116 -75 1 14 18 - 0 14 51 24 24 20 -22 0 52 -0.12 -117 0 0 0 5 37 7 10 30.5 28 116 -76 0 50 12 - 0 38 53 23 58 44 -22 23 43 -0.12 -116 0 0 - 0 18 17 7 10 26.2 29 116 -76 0 26 15 - 1 2 44 23 33 14 -22 46 22 -0.12 -115 0 0 - 0 42 1 7 10 21.8 30 116 -77 0 2 28 - 1 26 26 23 7 50 -23 8 47 -0.12 -114 0 0 - 1 5 34 7 10 17.2 31 116 -78 - 0 21 8 - 1 49 56 22 42 34 -23 30 58 -0.12 -113 0 0 - 1 28 56 7 10 12.5 32 116 -79 - 0 44 32 - 2 13 15 22 17 26 -23 52 56 -0.12 -112 0 0 - 1 52 6 7 10 7.6 34 116 -80 - 1 7 46 - 2 36 22 21 52 26 -24 14 40 -0.12 -111 0 0 - 2 15 4 7 10 2.6 35 116 -81 - 1 30 47 - 2 59 17 21 27 36 -24 36 9 -0.12 -110 0 0 - 2 37 50 7 9 57.5 36 116 -81 - 1 53 35 - 3 21 59 21 2 55 -24 57 23 -0.12 -109 0 0 - 3 0 22 7 9 52.3 37 116 -82 - 2 16 11 - 3 44 29 20 38 25 -25 18 22 -0.12 -108 0 0 - 3 22 41 7 9 47.0 38 116 -82 - 2 38 33 - 4 6 44 20 14 6 -25 39 5 -0.12 -107 0 0 - 3 44 46 7 9 41.5 39 116 -83 - 3 0 41 - 4 28 46 19 49 58 -25 59 33 -0.12 -106 0 0 - 4 6 36 7 9 36.0 40 116 -83 - 3 22 35 - 4 50 33 19 26 3 -26 19 45 -0.12 -105 0 0 - 4 28 12 7 9 30.3 41 116 -83 - 3 44 14 - 5 12 5 19 2 21 -26 39 41 -0.12 -104 0 0 - 4 49 33 7 9 24.5 42 116 -83 - 4 5 38 - 5 33 23 18 38 52 -26 59 20 -0.12 -103 0 0 - 5 10 38 7 9 18.6 43 116 -83 - 4 26 47 - 5 54 25 18 15 37 -27 18 42 -0.12 -102 0 0 - 5 31 28 7 9 12.6 44 116 -82 - 4 47 41 - 6 15 11 17 52 36 -27 37 48 -0.12 -101 0 0 - 5 52 2 7 9 6.5 45 116 -82 - 5 8 18 - 6 35 41 17 29 50 -27 56 36 -0.12 -100 0 0 - 6 12 19 7 9 0.4 46 116 -81 - 5 28 39 - 6 55 55 17 7 20 -28 15 8 -0.12 - 99 0 0 - 6 32 19 7 8 54.1 47 116 -80 - 5 48 43 - 7 15 52 16 45 5 -28 33 21 -0.12 - 98 0 0 - 6 52 3 7 8 47.7 48 116 -80 - 6 8 30 - 7 35 31 16 23 7 -28 51 17 -0.12 - 97 0 0 - 7 11 29 7 8 41.3 49 116 -79 - 6 28 0 - 7 54 54 16 1 26 -29 8 55 -0.12 - 96 0 0 - 7 30 38 7 8 34.8 50 116 -78 - 6 47 12 - 8 13 59 15 40 2 -29 26 15 -0.12 - 95 0 0 - 7 49 28 7 8 28.1 51 116 -77 - 7 6 6 - 8 32 46 15 18 56 -29 43 17 -0.12 - 94 0 0 - 8 8 1 7 8 21.5 52 116 -77 - 7 24 43 - 8 51 15 14 58 8 -30 0 1 -0.12 - 93 0 0 - 8 26 15 7 8 14.7 53 116 -76 - 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Uncertainty in time = +/- 363 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: UCAC4 339-086245 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 06 13.7317 DE: -22 20 16.553 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 06 13.7317 DE: -22 20 16.553 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 14.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (469506) 2003 FF128 asteroid class: TNO approx. diameter [km]: 151 approx. diameter ["]: 0.007 distance from Earth [AU]: 30.37520 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#10 date of fit: 2022 Sep 23 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): 0.218", 0.101", 96.792° remarks: * orbital elements for (469506)2003 FF128 : Mean anomaly = 355.7861133030 deg Arg. of pericenter = 171.1058273812 deg Long. of node = 91.7238752146 deg Inclination = 1.9124868450 deg Eccentricity = 0.2136389247 Semimajor axis = 39.4315442883 AU Perihelion dist = 31.0074315655 AU Mag: H = 6.88, G = 0.15 Epoch of elements : MJD 60053.29284722 TDT (2023 Apr 19.2928) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#102022Sep23,11.42,2023,4,19,7.058441,0.010536,0.116949,-7.445556,0.683074,-0.004519,0.000374,0.000001,0.000000 -56.0969,-22.3700,73.93,11.11,False UCAC4 339-086245,17.10381436,-22.3379313,0.00,14.94,0.00,0.0,0,,17.12721052,-22.3699514,7.00,0.00,0,0,0 469506,2003 FF128,21.94,151.3,30.3752,0,0,-0.155,0.20,,15.0,0 0,355.7849,2023,4,19,171.1058,91.7239,1.9125,0.21364,39.43154,31.00743,6.88,5.0,0.15 15.676,0.2180,0.1007,97,0.1008,Known errors,-1.00,-1,-1,-1 20230419_086245,60004.05 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org