IOTA/IOTA-ES occultation update for (171) Ophelia / TYC 6277-00420-1 event on 2023 Mar 28, 05:52 UT Visible from South America Summary ------- On 2023 Mar 28 UT, the 114.4 km diameter asteroid (171) Ophelia will occult a 11.2 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 3.35 mag to 14.45 mag (the magnitude of the asteroid) for at most 7.990 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 Mar 28, 05:44 - 2023 Mar 28, 05:59 * geocentric midpoint of event [JD]: 2460031.74453037 * magnitude of target star: 11.15 * magnitude drop [mag]: 3.35 * estimated maximum duration [s]: 7.990 * Moon: 42 % sunlit, 171° distance * Sun: 92° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 119 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.003", 91°) * approx speed of asteroid's shadow [km/s]: 14.3201 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6277-00420-1 by 171 Ophelia on 2023 Mar 28 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 - 93 0 0 .. .. .... .. .. .. .. .. .. -16 40 15 .. .. .. -16 44 29 .. .. .. .... - 92 0 0 -16 29 48 5 44 59.3 1 113 -75 -17 5 6 -15 54 37 -17 9 20 -15 50 25 .... - 91 0 0 -16 54 38 5 44 59.6 2 113 -75 -17 29 56 -16 19 27 -17 34 10 -16 15 14 0.29 - 90 0 0 -17 19 25 5 45 0.0 3 112 -75 -17 54 44 -16 44 14 -17 58 58 -16 40 2 0.30 - 89 0 0 -17 44 11 5 45 0.5 4 112 -75 -18 19 29 -17 8 59 -18 23 43 -17 4 47 0.30 - 88 0 0 -18 8 53 5 45 1.2 5 112 -75 -18 44 11 -17 33 42 -18 48 26 -17 29 29 0.30 - 87 0 0 -18 33 32 5 45 2.0 6 111 -74 -19 8 50 -17 58 21 -19 13 4 -17 54 8 0.30 - 86 0 0 -18 58 7 5 45 3.0 7 111 -74 -19 33 24 -18 22 56 -19 37 39 -18 18 43 0.30 - 85 0 0 -19 22 37 5 45 4.1 8 111 -74 -19 57 54 -18 47 26 -20 2 8 -18 43 14 0.30 - 84 0 0 -19 47 1 5 45 5.4 9 110 -73 -20 22 18 -19 11 51 -20 26 32 -19 7 39 0.30 - 83 0 0 -20 11 19 5 45 6.8 10 110 -73 -20 46 36 -19 36 10 -20 50 50 -19 31 58 0.30 - 82 0 0 -20 35 31 5 45 8.4 11 110 -72 -21 10 47 -20 0 23 -21 15 0 -19 56 11 0.30 - 81 0 0 -20 59 36 5 45 10.1 12 109 -72 -21 34 50 -20 24 29 -21 39 4 -20 20 17 0.30 - 80 0 0 -21 23 33 5 45 11.9 13 109 -71 -21 58 46 -20 48 27 -22 3 0 -20 44 15 0.30 - 79 0 0 -21 47 22 5 45 13.9 14 109 -70 -22 22 34 -21 12 16 -22 26 47 -21 8 5 0.30 - 78 0 0 -22 11 2 5 45 16.0 15 108 -70 -22 46 12 -21 35 58 -22 50 26 -21 31 46 0.30 - 77 0 0 -22 34 32 5 45 18.3 16 108 -69 -23 9 41 -21 59 29 -23 13 54 -21 55 18 0.30 - 76 0 0 -22 57 52 5 45 20.6 17 107 -68 -23 33 0 -22 22 51 -23 37 13 -22 18 40 0.30 - 75 0 0 -23 21 3 5 45 23.1 18 107 -67 -23 56 9 -22 46 3 -24 0 21 -22 41 52 0.30 - 74 0 0 -23 44 2 5 45 25.8 19 106 -67 -24 19 6 -23 9 4 -24 23 18 -23 4 53 0.30 - 73 0 0 -24 6 49 5 45 28.5 20 106 -66 -24 41 52 -23 31 54 -24 46 4 -23 27 43 0.30 - 72 0 0 -24 29 25 5 45 31.4 21 106 -65 -25 4 25 -23 54 31 -25 8 38 -23 50 21 0.30 - 71 0 0 -24 51 48 5 45 34.4 22 105 -64 -25 26 47 -24 16 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Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: TYC 6277-00420-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 20 20.9524 DE: -22 14 21.943 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 20 20.9525 DE: -22 14 21.943 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (171) Ophelia asteroid class: approx. diameter [km]: 114 approx. diameter ["]: 0.054 distance from Earth [AU]: 2.94820 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#135 date of fit: 2023 Feb 07 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): 0.015", 0.003", 91.226° remarks: * orbital elements for (171)Ophelia : Mean anomaly = 85.1222389626 deg Arg. of pericenter = 55.5304152581 deg Long. of node = 100.4676346836 deg Inclination = 2.5466475565 deg Eccentricity = 0.1320187603 Semimajor axis = 3.1304107921 AU Perihelion dist = 2.7171378402 AU Mag: H = 8.65, G = 0.15 Epoch of elements : MJD 60031.24458333 TDT (2023 Mar 28.2446) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1352023Feb07,7.99,2023,3,28,5.868729,0.006719,-0.274612,8.080284,0.195101,-0.005852,-0.000228,0.000000,0.000000 2.0085,-22.2300,93.28,2.90,False TYC 6277-00420-1,18.33915342,-22.2394287,0.00,11.15,0.00,0.0,0,,18.36232642,-22.2299584,3.35,0.00,0,0,0 171,Ophelia,14.45,114.4,2.9482,0,0,1.736,0.58,,5.8,0 0,85.0787,2023,3,28,55.5304,100.4676,2.5466,0.13202,3.13041,2.71714,8.66,5.0,0.15 1.060,0.0150,0.0031,91,0.0032,Known errors,-1.00,-1,-1,-1 20230328_0420-1,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org