IOTA/IOTA-ES occultation update for (1961) Dufour / TYC 7391-01812-1 event on 2023 Aug 05, 09:02 UT Visible from E Australia Summary ------- On 2023 Aug 05 UT, the 50.2 km diameter asteroid (1961) Dufour will occult a 10.9 mag star in the constellation Sagittarius for observers along a path across E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.63 mag to 16.51 mag (the magnitude of the asteroid) for at most 6.340 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: 99 * date and approx. time of event: 2023 Aug 05, 08:48 - 2023 Aug 05, 09:16 * geocentric midpoint of event [JD]: 2460161.87677696 * magnitude of target star: 10.89 * magnitude drop [mag]: 5.63 * estimated maximum duration [s]: 6.340 * Moon: 82 % sunlit, 90° distance * Sun: 139° distance * rough path description: E Australia The occultation path -------------------- * approximate projected width [km]: 50 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.001", 93°) * approx speed of asteroid's shadow [km/s]: 7.9187 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7391-01812-1 by 1961 Dufour on 2023 Aug 5 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 95 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 8 23 38 .. .. .. 8 19 38 .... 96 0 0 8 2 7 9 15 58.2 1 122 37 8 18 13 7 46 0 8 22 13 7 42 0 .... 97 0 0 7 24 13 9 15 57.7 2 122 36 7 40 21 7 8 5 7 44 22 7 4 4 0.09 98 0 0 6 46 4 9 15 56.9 3 123 35 7 2 13 6 29 54 7 6 15 6 25 53 0.06 99 0 0 6 7 39 9 15 55.7 5 123 34 6 23 50 5 51 29 6 27 52 5 47 27 0.05 100 0 0 5 29 2 9 15 54.2 6 123 33 5 45 14 5 12 50 5 49 16 5 8 47 0.04 101 0 0 4 50 12 9 15 52.3 7 123 32 5 6 25 4 33 59 5 10 27 4 29 56 0.04 102 0 0 4 11 11 9 15 50.1 8 123 30 4 27 25 3 54 56 4 31 28 3 50 54 0.03 103 0 0 3 32 0 9 15 47.6 9 123 29 3 48 15 3 15 45 3 52 18 3 11 42 0.03 104 0 0 2 52 41 9 15 44.7 11 123 28 3 8 57 2 36 25 3 13 0 2 32 22 0.03 105 0 0 2 13 14 9 15 41.5 12 123 27 2 29 31 1 56 58 2 33 34 1 52 54 0.03 106 0 0 1 33 42 9 15 38.0 13 123 26 1 49 59 1 17 25 1 54 2 1 13 21 0.03 107 0 0 0 54 5 9 15 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-17 13 5 -17 52 40 0.04 - 82 0 0 -16 58 20 8 49 16.1 7 239 -43 -16 42 26 -17 14 13 -16 38 29 -17 18 11 0.04 - 81 0 0 -16 23 18 8 49 14.2 6 239 -42 -16 7 22 -16 39 14 -16 3 24 -16 43 12 0.04 - 80 0 0 -15 47 48 8 49 12.6 5 238 -41 -15 31 49 -16 3 47 -15 27 51 -16 7 46 0.05 - 79 0 0 -15 11 51 8 49 11.3 4 238 -40 -14 55 50 -15 27 52 -14 51 50 -15 31 52 0.06 - 78 0 0 -14 35 27 8 49 10.3 3 238 -39 -14 19 23 -14 51 31 -14 15 23 -14 55 31 0.08 - 77 0 0 -13 58 38 8 49 9.7 2 238 -38 -13 42 31 -14 14 44 -13 38 31 -14 18 45 0.11 - 76 0 0 -13 21 23 8 49 9.3 1 237 -37 -13 5 14 -13 37 32 -13 1 13 -13 41 33 0.30 Uncertainty in time = +/- 4 secs Prediction of 2023 Jun 15.2 Data for the target star ------------------------ * name: TYC 7391-01812-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 07 46.9014 DE: -31 42 22.644 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 07 46.9013 DE: -31 42 22.644 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1961) Dufour asteroid class: approx. diameter [km]: 50 approx. diameter ["]: 0.025 distance from Earth [AU]: 2.74580 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): 0.017", 0.001", 92.756° remarks: * orbital elements for (1961)Dufour : Mean anomaly = 201.0970061781 deg Arg. of pericenter = 56.3866632624 deg Long. of node = 29.5599042656 deg Inclination = 6.6496668741 deg Eccentricity = 0.1256036314 Semimajor axis = 3.1908376622 AU Perihelion dist = 2.7900568646 AU Mag: H = 10.88, G = 0.15 Epoch of elements : MJD 60161.37666667 TDT (2023 Aug 05.3767) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#662023Apr24,6.34,2023,8,5,9.042647,-0.009743,-0.043819,-4.360492,0.981145,0.003683,0.000686,0.000001,0.000000 -176.9689,-31.7041,45.88,16.99,False TYC 7391-01812-1,18.12969483,-31.7062900,0.00,10.89,0.00,0.0,0,,18.15543887,-31.7041334,5.62,0.00,0,0,0 1961,Dufour,16.51,50.200,2.7458,0,0,-1.094,3.14,,2.8,0 0,201.0319,2023,8,5,56.3867,29.5599,6.6497,0.12560,3.19084,2.79006,10.87,5.0,0.15 1.125,0.0167,0.0013,93,0.0031,Known errors,-1.00,-1,-1,-1 20230805_1812-1,60110.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jun 15, 05:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org