IOTA/IOTA-ES occultation update for (203) Pompeja / UCAC4 311-216788 event on 2023 Jun 29, 18:58 UT Visible from Australia Summary ------- On 2023 Jun 29 UT, the 117.6 km diameter asteroid (203) Pompeja will occult a 11.5 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.53 mag to 12.69 mag (the magnitude of the asteroid) for at most 9.830 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: 100 * date and approx. time of event: 2023 Jun 29, 18:49 - 2023 Jun 29, 19:06 * geocentric midpoint of event [JD]: 2460125.29045120 * magnitude of target star: 11.46 * magnitude drop [mag]: 1.53 * estimated maximum duration [s]: 9.830 * Moon: 83 % sunlit, 47° distance * Sun: 175° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 129 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.003", 86°) * approx speed of asteroid's shadow [km/s]: 11.9646 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 311-216788 by 203 Pompeja on 2023 Jun 29 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 - 30 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -23 35 34 .. .. .. -23 38 11 .... - 29 0 0 -23 27 48 19 6 18.7 1 120 2 -22 47 24 -24 8 27 -22 44 50 -24 11 4 .... - 28 0 0 -24 0 37 19 6 18.4 2 120 1 -23 20 11 -24 41 18 -23 17 37 -24 43 54 0.42 - 27 0 0 -24 33 23 19 6 17.9 3 119 0 -23 52 55 -25 14 5 -23 50 21 -25 16 41 0.43 - 26 0 0 -25 6 4 19 6 17.3 4 119 -1 -24 25 35 -25 46 47 -24 23 1 -25 49 24 0.43 - 25 0 0 -25 38 40 19 6 16.4 5 119 -2 -24 58 10 -26 19 24 -24 55 36 -26 22 1 0.43 - 24 0 0 -26 11 9 19 6 15.3 6 118 -3 -25 30 39 -26 51 55 -25 28 4 -26 54 31 0.43 - 23 0 0 -26 43 32 19 6 14.1 7 118 -4 -26 3 1 -27 24 18 -26 0 26 -27 26 54 0.44 - 22 0 0 -27 15 46 19 6 12.6 8 117 -5 -26 35 15 -27 56 32 -26 32 41 -27 59 9 0.44 - 21 0 0 -27 47 52 19 6 11.0 9 117 -6 -27 7 21 -28 28 38 -27 4 46 -28 31 15 0.44 - 20 0 0 -28 19 47 19 6 9.2 10 116 -7 -27 39 17 -29 0 33 -27 36 42 -29 3 10 0.44 - 19 0 0 -28 51 32 19 6 7.2 11 116 -8 -28 11 2 -29 32 17 -28 8 27 -29 34 54 0.44 - 18 0 0 -29 23 5 19 6 5.1 12 115 -9 -28 42 36 -30 3 50 -28 40 1 -30 6 27 0.44 - 17 0 0 -29 54 26 19 6 2.8 13 115 -10 -29 13 58 -30 35 10 -29 11 23 -30 37 46 0.44 - 16 0 0 -30 25 34 19 6 0.3 14 114 -11 -29 45 7 -31 6 16 -29 42 32 -31 8 53 0.44 - 15 0 0 -30 56 28 19 5 57.7 15 114 -12 -30 16 2 -31 37 9 -30 13 27 -31 39 45 0.44 - 14 0 0 -31 27 7 19 5 54.9 16 113 -13 -30 46 42 -32 7 46 -30 44 8 -32 10 22 0.44 - 13 0 0 -31 57 30 19 5 52.0 17 113 -14 -31 17 8 -32 38 8 -31 14 34 -32 40 44 0.44 - 12 0 0 -32 27 38 19 5 49.0 18 112 -15 -31 47 18 -33 8 13 -31 44 44 -33 10 49 0.44 - 11 0 0 -32 57 29 19 5 45.8 19 111 -16 -32 17 11 -33 38 2 -32 14 37 -33 40 38 0.44 - 10 0 0 -33 27 3 19 5 42.4 20 111 -17 -32 46 47 -34 7 33 -32 44 13 -34 10 9 0.44 - 9 0 0 -33 56 18 19 5 39.0 21 110 -18 -33 16 6 -34 36 46 -33 13 32 -34 39 21 0.44 - 8 0 0 -34 25 15 19 5 35.4 22 110 -19 -33 45 6 -35 5 40 -33 42 32 -35 8 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-29 50 49 0.47 164 0 0 -28 35 56 18 50 32.3 15 246 -14 -27 55 28 -29 16 40 -27 52 53 -29 19 17 0.47 165 0 0 -28 4 13 18 50 29.6 14 246 -13 -27 23 43 -28 44 57 -27 21 9 -28 47 33 0.47 166 0 0 -27 32 19 18 50 27.1 13 245 -12 -26 51 49 -28 13 3 -26 49 15 -28 15 39 0.47 167 0 0 -27 0 15 18 50 24.8 12 245 -11 -26 19 46 -27 40 59 -26 17 11 -27 43 36 0.48 168 0 0 -26 28 3 18 50 22.6 11 244 -10 -25 47 35 -27 8 47 -25 45 0 -27 11 24 0.48 169 0 0 -25 55 44 18 50 20.6 10 244 -9 -25 15 16 -26 36 27 -25 12 42 -26 39 4 0.48 170 0 0 -25 23 18 18 50 18.8 9 243 -8 -24 42 51 -26 4 0 -24 40 17 -26 6 37 0.49 171 0 0 -24 50 47 18 50 17.1 8 243 -7 -24 10 21 -25 31 27 -24 7 46 -25 34 4 0.49 172 0 0 -24 18 10 18 50 15.7 7 242 -6 -23 37 46 -24 58 50 -23 35 11 -25 1 26 0.50 173 0 0 -23 45 30 18 50 14.4 6 242 -5 -23 5 7 -24 26 8 -23 2 33 -24 28 44 0.51 174 0 0 -23 12 47 18 50 13.4 5 242 -4 -22 32 26 -23 53 23 -22 29 52 -23 55 59 0.53 175 0 0 -22 40 3 18 50 12.5 4 241 -3 -21 59 44 -23 20 36 -21 57 9 -23 23 12 0.55 176 0 0 -22 7 17 18 50 11.9 3 241 -2 -21 27 0 -22 47 49 -21 24 26 -22 50 24 0.59 177 0 0 -21 34 32 18 50 11.4 2 241 -1 -20 54 18 -22 15 1 -20 51 44 -22 17 37 0.68 178 0 0 -21 1 48 18 50 11.2 1 240 0 -20 21 36 -21 42 14 -20 19 3 -21 44 50 1.07 Uncertainty in time = +/- 2 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 311-216788 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 27 36.8733 DE: -27 58 00.834 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 27 36.8733 DE: -27 58 00.834 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (203) Pompeja asteroid class: approx. diameter [km]: 118 approx. diameter ["]: 0.089 distance from Earth [AU]: 1.82420 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#131 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): 0.017", 0.003", 85.89° remarks: * orbital elements for (203)Pompeja : Mean anomaly = 234.0538392364 deg Arg. of pericenter = 60.1105289540 deg Long. of node = 347.7047423656 deg Inclination = 3.1718504857 deg Eccentricity = 0.0596443411 Semimajor axis = 2.7365953096 AU Perihelion dist = 2.5733728853 AU Mag: H = 8.88, G = 0.15 Epoch of elements : MJD 60124.79048611 TDT (2023 Jun 29.7905) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1312023Apr24,9.83,2023,6,29,18.970829,0.009732,-0.418602,-6.751338,-0.156966,0.000134,0.000460,0.000001,0.000000 75.1157,-27.9526,-103.68,23.21,False UCAC4 311-216788,18.46024257,-27.9668984,0.00,11.46,0.00,0.0,0,,18.48515199,-27.9526220,1.53,0.00,0,0,0 203,Pompeja,12.69,117.6,1.8242,0,0,-2.456,-0.75,,6.8,0 0,233.8817,2023,6,29,60.1105,347.7047,3.1719,0.05964,2.73660,2.57337,8.90,5.0,0.15 1.032,0.0173,0.0027,86,0.0028,Known errors,-1.00,-1,-1,-1 20230629_216788,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org