IOTA/IOTA-ES occultation update for (1961) Dufour / TYC 7396-00196-1 event on 2023 Jul 20, 22:33 UT Visible from S Africa, South America Summary ------- On 2023 Jul 20 UT, the 50.2 km diameter asteroid (1961) Dufour will occult a 11.8 mag star in the constellation Sagittarius for observers along a path across S Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.46 mag to 16.26 mag (the magnitude of the asteroid) for at most 4.120 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 Jul 20, 22:24 - 2023 Jul 20, 22:42 * geocentric midpoint of event [JD]: 2460146.43986833 * magnitude of target star: 11.82 * magnitude drop [mag]: 4.46 * estimated maximum duration [s]: 4.120 * Moon: 9 % sunlit, 122° distance * Sun: 155° distance * rough path description: S Africa, South America The occultation path -------------------- * approximate projected width [km]: 50 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.001", 91°) * approx speed of asteroid's shadow [km/s]: 12.1774 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7396-00196-1 by 1961 Dufour on 2023 Jul 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 - 93 0 0 2 6 24 22 42 8.5 0 122 23 .. .. .. 1 50 21 .. .. .. 1 48 39 .... - 92 0 0 1 28 44 22 42 8.4 1 122 22 1 44 47 1 12 41 1 46 30 1 10 58 0.13 - 91 0 0 0 51 3 22 42 8.1 2 122 21 1 7 6 0 34 59 1 8 48 0 33 17 0.06 - 90 0 0 0 13 22 22 42 7.5 4 122 20 0 29 25 - 0 2 42 0 31 7 - 0 4 24 0.03 - 89 0 0 - 0 24 18 22 42 6.7 5 122 19 - 0 8 15 - 0 40 21 - 0 6 33 - 0 42 3 0.02 - 88 0 0 - 1 1 55 22 42 5.7 6 122 17 - 0 45 52 - 1 17 58 - 0 44 10 - 1 19 40 0.01 - 87 0 0 - 1 39 28 22 42 4.5 7 122 16 - 1 23 26 - 1 55 30 - 1 21 44 - 1 57 12 0.01 - 86 0 0 - 2 16 56 22 42 3.0 8 122 15 - 2 0 55 - 2 32 58 - 1 59 12 - 2 34 40 0.00 - 85 0 0 - 2 54 18 22 42 1.4 9 122 14 - 2 38 17 - 3 10 19 - 2 36 35 - 3 12 1 0.00 - 84 0 0 - 3 31 33 22 41 59.5 11 122 13 - 3 15 33 - 3 47 33 - 3 13 51 - 3 49 15 0.00 - 83 0 0 - 4 8 39 22 41 57.5 12 122 12 - 3 52 40 - 4 24 38 - 3 50 58 - 4 26 20 0.00 - 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20 240 -43 -12 31 19 -13 2 33 -12 29 39 -13 4 13 -0.01 75 0 0 -12 13 38 22 25 9.4 19 240 -42 -11 57 58 -12 29 17 -11 56 19 -12 30 57 -0.01 76 0 0 -11 39 57 22 25 6.1 18 240 -41 -11 24 15 -11 55 38 -11 22 35 -11 57 18 -0.01 77 0 0 -11 5 54 22 25 3.1 17 240 -40 -10 50 11 -11 21 38 -10 48 31 -11 23 18 -0.01 78 0 0 -10 31 31 22 25 0.2 16 240 -38 -10 15 45 -10 47 16 -10 14 5 -10 48 56 -0.01 79 0 0 - 9 56 47 22 24 57.6 14 239 -37 - 9 41 0 -10 12 34 - 9 39 19 -10 14 15 -0.01 80 0 0 - 9 21 44 22 24 55.1 13 239 -36 - 9 5 55 - 9 37 33 - 9 4 14 - 9 39 14 0.00 81 0 0 - 8 46 23 22 24 52.8 12 239 -35 - 8 30 32 - 9 2 13 - 8 28 51 - 9 3 54 0.00 82 0 0 - 8 10 44 22 24 50.7 11 239 -34 - 7 54 51 - 8 26 36 - 7 53 10 - 8 28 17 0.00 83 0 0 - 7 34 48 22 24 48.8 10 239 -33 - 7 18 54 - 7 50 42 - 7 17 13 - 7 52 23 0.00 84 0 0 - 6 58 36 22 24 47.0 9 239 -32 - 6 42 41 - 7 14 32 - 6 40 59 - 7 16 13 0.00 85 0 0 - 6 22 10 22 24 45.6 8 239 -31 - 6 6 13 - 6 38 7 - 6 4 32 - 6 39 48 0.00 86 0 0 - 5 45 30 22 24 44.3 6 238 -30 - 5 29 32 - 6 1 28 - 5 27 50 - 6 3 10 0.01 87 0 0 - 5 8 37 22 24 43.2 5 238 -28 - 4 52 38 - 5 24 37 - 4 50 56 - 5 26 19 0.01 88 0 0 - 4 31 33 22 24 42.3 4 238 -27 - 4 15 33 - 4 47 33 - 4 13 51 - 4 49 15 0.02 89 0 0 - 3 54 18 22 24 41.7 3 238 -26 - 3 38 17 - 4 10 20 - 3 36 35 - 4 12 2 0.04 90 0 0 - 3 16 54 22 24 41.2 2 238 -25 - 3 0 52 - 3 32 56 - 2 59 10 - 3 34 39 0.08 91 0 0 - 2 39 22 22 24 41.0 1 238 -24 - 2 23 19 - 2 55 25 - 2 21 36 - 2 57 7 0.29 Uncertainty in time = +/- 3 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: TYC 7396-00196-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 16 50.4230 DE: -31 56 14.550 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 16 50.4229 DE: -31 56 14.551 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1961) Dufour asteroid class: approx. diameter [km]: 50 approx. diameter ["]: 0.026 distance from Earth [AU]: 2.63080 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#66 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): 0.018", 0.001", 91.489° remarks: * orbital elements for (1961)Dufour : Mean anomaly = 198.4278227283 deg Arg. of pericenter = 56.3858886503 deg Long. of node = 29.5599250285 deg Inclination = 6.6496676434 deg Eccentricity = 0.1255815060 Semimajor axis = 3.1908986403 AU Perihelion dist = 2.7901807836 AU Mag: H = 10.88, G = 0.15 Epoch of elements : MJD 60145.93979167 TDT (2023 Jul 20.9398) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#662023Apr24,4.12,2023,7,20,22.556840,0.000098,-0.002330,-6.865926,0.316923,0.002320,0.000850,0.000001,0.000000 -2.2009,-31.9297,-156.74,20.57,False TYC 7396-00196-1,18.28067305,-31.9373751,0.00,11.82,0.00,0.0,0,,18.30647474,-31.9296841,4.45,0.00,0,0,0 1961,Dufour,16.26,50.2,2.6308,0,0,-1.802,1.06,,2.8,0 0,198.2653,2023,7,20,56.3859,29.5599,6.6497,0.12558,3.19090,2.79018,10.87,5.0,0.15 1.053,0.0177,0.0014,91,0.0014,Known errors,-1.00,-1,-1,-1 20230720_0196-1,60092.98 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org