IOTA/IOTA-ES occultation update for (171) Ophelia / UCAC4-338-137265 event on 2023 Jun 02, 08:22 UT Visible from South America Summary ------- On 2023 Jun 02 UT, the 114.4 km diameter asteroid (171) Ophelia will occult a 12.4 mag star in the constellation Sagittarius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.42 mag to 13.52 mag (the magnitude of the asteroid) for at most 10.310 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 02, 08:13 - 2023 Jun 02, 08:32 * geocentric midpoint of event [JD]: 2460097.84925725 * magnitude of target star: 12.44 * magnitude drop [mag]: 1.42 * estimated maximum duration [s]: 10.310 * Moon: 96 % sunlit, 47° distance * Sun: 157° distance * rough path description: South America Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 118 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.005", 91°) * approx speed of asteroid's shadow [km/s]: 11.0997 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-338-137265 by 171 Ophelia on 2023 Jun 2 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 159 0 0 -18 46 54 8 32 10.5 0 114 -23 -18 11 58 -19 21 56 -18 6 55 -19 27 2 .... 160 0 0 -19 12 6 8 32 10.4 1 113 -24 -18 37 11 -19 47 7 -18 32 7 -19 52 12 0.26 161 0 0 -19 37 9 8 32 10.0 2 113 -25 -19 2 15 -20 12 8 -18 57 11 -20 17 13 0.26 162 0 0 -20 2 2 8 32 9.5 3 113 -26 -19 27 10 -20 37 1 -19 22 7 -20 42 6 0.26 163 0 0 -20 26 47 8 32 8.7 4 112 -27 -19 51 55 -21 1 44 -19 46 52 -21 6 48 0.26 164 0 0 -20 51 21 8 32 7.8 5 112 -28 -20 16 31 -21 26 16 -20 11 28 -21 31 21 0.26 165 0 0 -21 15 44 8 32 6.7 6 112 -29 -20 40 56 -21 50 38 -20 35 53 -21 55 42 0.26 166 0 0 -21 39 56 8 32 5.5 7 111 -30 -21 5 9 -22 14 49 -21 0 7 -22 19 53 0.26 167 0 0 -22 3 57 8 32 4.0 8 111 -31 -21 29 12 -22 38 48 -21 24 10 -22 43 51 0.26 168 0 0 -22 27 45 8 32 2.4 9 111 -32 -21 53 2 -23 2 34 -21 48 1 -23 7 38 0.26 169 0 0 -22 51 21 8 32 0.6 10 110 -33 -22 16 40 -23 26 8 -22 11 39 -23 31 12 0.26 170 0 0 -23 14 45 8 31 58.6 11 110 -34 -22 40 5 -23 49 30 -22 35 4 -23 54 33 0.26 171 0 0 -23 37 54 8 31 56.5 12 109 -35 -23 3 17 -24 12 37 -22 58 17 -24 17 40 0.26 172 0 0 -24 0 50 8 31 54.2 13 109 -36 -23 26 16 -24 35 31 -23 21 15 -24 40 33 0.26 173 0 0 -24 23 32 8 31 51.8 14 109 -37 -23 49 0 -24 58 11 -23 43 59 -25 3 13 0.26 174 0 0 -24 46 0 8 31 49.2 15 108 -38 -24 11 29 -25 20 36 -24 6 30 -25 25 37 0.26 175 0 0 -25 8 12 8 31 46.4 16 108 -38 -24 33 44 -25 42 46 -24 28 45 -25 47 47 0.26 176 0 0 -25 30 10 8 31 43.5 17 107 -39 -24 55 44 -26 4 41 -24 50 45 -26 9 42 0.26 177 0 0 -25 51 51 8 31 40.5 18 107 -40 -25 17 28 -26 26 20 -25 12 30 -26 31 21 0.26 178 0 0 -26 13 17 8 31 37.3 19 106 -41 -25 38 57 -26 47 44 -25 33 59 -26 52 44 0.26 179 0 0 -26 34 27 8 31 34.0 20 106 -42 -26 0 9 -27 8 51 -25 55 11 -27 13 51 0.26 -180 0 0 -26 55 21 8 31 30.5 21 105 -43 -26 21 6 -27 29 42 -26 16 8 -27 34 41 0.26 -179 0 0 -27 15 58 8 31 26.9 22 105 -44 -26 41 45 -27 50 16 -26 36 48 -27 55 15 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-11 40 51 -10 26 8 -11 45 56 0.31 - 8 0 0 -10 40 32 8 13 42.2 3 248 19 -10 5 45 -11 15 24 -10 0 43 -11 20 28 0.33 - 7 0 0 -10 15 9 8 13 41.6 2 248 20 - 9 40 24 -10 50 0 - 9 35 22 -10 55 4 0.37 - 6 0 0 - 9 49 52 8 13 41.3 1 247 21 - 9 15 8 -10 24 42 - 9 10 7 -10 29 45 0.46 - 5 0 0 - 9 24 40 8 13 41.1 0 247 22 - 8 49 58 - 9 59 28 - 8 44 57 -10 4 32 1.28 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4-338-137265 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 19 57.8621 DE: -22 32 46.432 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 19 57.8621 DE: -22 32 46.432 * position source: Gaia DR3 * standard error: RA,DE [mas]: (3.500,2.700) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (171) Ophelia asteroid class: approx. diameter [km]: 114 approx. diameter ["]: 0.069 distance from Earth [AU]: 2.27590 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#136 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): 0.021", 0.004", 90.932° remarks: * orbital elements for (171)Ophelia : Mean anomaly = 96.9106440338 deg Arg. of pericenter = 55.5055529118 deg Long. of node = 100.4671577570 deg Inclination = 2.5467085918 deg Eccentricity = 0.1320370535 Semimajor axis = 3.1302287085 AU Perihelion dist = 2.7169225331 AU Mag: H = 8.64, G = 0.15 Epoch of elements : MJD 60097.34923611 TDT (2023 Jun 02.3492) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1362023Apr24,10.31,2023,6,2,8.382174,0.023140,-0.259158,-6.240522,-0.553324,-0.002222,-0.000155,0.000001,0.000000 -100.9364,-22.5364,53.76,22.17,False UCAC4-338-137265,18.33273946,-22.5462311,0.00,12.44,0.00,0.0,0,,18.35650805,-22.5364490,1.42,0.00,0,0,0 171,Ophelia,13.52,114.4,2.2759,0,0,-1.740,-2.13,,5.8,0 0,96.8485,2023,6,2,55.5056,100.4672,2.5467,0.13204,3.13023,2.71692,8.66,5.0,0.15 1.073,0.0210,0.0046,91,0.0050,Known errors,-1.00,-1,-1,-1 20230602_137265,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org