IOTA/IOTA-ES occultation update for (1961) Dufour / UCAC4 299-180457 event on 2023 Sep 23, 12:11 UT Visible from Australia Summary ------- On 2023 Sep 23 UT, the 50.2 km diameter asteroid (1961) Dufour will occult a 12.3 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 4.82 mag to 17.13 mag (the magnitude of the asteroid) for at most 3.770 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 Sep 23, 12:03 - 2023 Sep 23, 12:19 * geocentric midpoint of event [JD]: 2460211.00799492 * magnitude of target star: 12.32 * magnitude drop [mag]: 4.82 * estimated maximum duration [s]: 3.770 * Moon: 59 % sunlit, 7° distance * Sun: 93° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.006, +/- 0.000) * 1 sigma uncertainty ellipse (major, minor, PA): (0.006", 0.000", 92°) * approx speed of asteroid's shadow [km/s]: 13.3272 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 299-180457 by 1961 Dufour on 2023 Sep 23 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 - 10 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -17 28 10 .. .. .. .... - 9 0 0 -17 45 19 12 3 35.7 1 122 71 -18 1 28 -17 29 10 -18 3 55 -17 26 44 .... - 8 0 0 -18 20 45 12 3 35.9 2 121 71 -18 36 53 -18 4 38 -18 39 19 -18 2 13 0.18 - 7 0 0 -18 55 51 12 3 36.4 3 121 71 -19 11 57 -18 39 46 -19 14 23 -18 37 21 0.16 - 6 0 0 -19 30 35 12 3 37.0 4 121 70 -19 46 39 -19 14 32 -19 49 4 -19 12 7 0.16 - 5 0 0 -20 4 56 12 3 37.8 5 120 70 -20 20 58 -19 48 55 -20 23 23 -19 46 30 0.15 - 4 0 0 -20 38 54 12 3 38.8 7 120 69 -20 54 54 -20 22 55 -20 57 19 -20 20 30 0.15 - 3 0 0 -21 12 28 12 3 39.9 8 120 69 -21 28 25 -20 56 31 -21 30 50 -20 54 6 0.14 - 2 0 0 -21 45 36 12 3 41.2 9 119 68 -22 1 31 -21 29 41 -22 3 55 -21 27 18 0.14 - 1 0 0 -22 18 19 12 3 42.7 10 119 68 -22 34 12 -22 2 27 -22 36 35 -22 0 3 0.14 - 0 0 0 -22 50 35 12 3 44.3 11 118 67 -23 6 26 -22 34 45 -23 8 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57 38 12 18 16.7 31 241 -61 -11 14 7 -10 41 9 -11 16 36 -10 38 40 0.14 148 0 0 -10 18 13 12 18 21.8 30 241 -63 -10 34 43 -10 1 44 -10 37 12 - 9 59 15 0.14 149 0 0 - 9 38 41 12 18 26.8 29 241 -64 - 9 55 11 - 9 22 12 - 9 57 41 - 9 19 43 0.14 150 0 0 - 8 59 4 12 18 31.5 28 240 -65 - 9 15 34 - 8 42 34 - 9 18 3 - 8 40 5 0.14 151 0 0 - 8 19 22 12 18 36.1 26 240 -66 - 8 35 52 - 8 2 53 - 8 38 22 - 8 0 24 0.14 152 0 0 - 7 39 37 12 18 40.5 25 240 -67 - 7 56 7 - 7 23 8 - 7 58 37 - 7 20 39 0.14 153 0 0 - 6 59 51 12 18 44.7 24 240 -68 - 7 16 21 - 6 43 22 - 7 18 50 - 6 40 53 0.14 154 0 0 - 6 20 5 12 18 48.8 23 240 -70 - 6 36 34 - 6 3 37 - 6 39 4 - 6 1 8 0.14 155 0 0 - 5 40 20 12 18 52.6 22 240 -71 - 5 56 49 - 5 23 53 - 5 59 18 - 5 21 24 0.15 156 0 0 - 5 0 39 12 18 56.2 20 239 -72 - 5 17 7 - 4 44 12 - 5 19 35 - 4 41 43 0.15 157 0 0 - 4 21 1 12 18 59.6 19 239 -73 - 4 37 28 - 4 4 35 - 4 39 57 - 4 2 6 0.15 158 0 0 - 3 41 29 12 19 2.8 18 239 -74 - 3 57 55 - 3 25 4 - 4 0 24 - 3 22 35 0.15 159 0 0 - 3 2 4 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26.1 1 239 -85 4 54 5 5 26 4 4 51 40 5 28 29 0.32 173 0 0 5 45 43 12 19 26.2 0 239 -84 5 29 46 6 1 40 5 27 22 6 4 4 1.60 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 299-180457 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 12 30.5188 DE: -30 19 53.493 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 12 30.5188 DE: -30 19 53.493 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1961) Dufour asteroid class: approx. diameter [km]: 50 approx. diameter ["]: 0.021 distance from Earth [AU]: 3.35630 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#69 date of fit: 2023 Aug 22 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): 0.006", 0.000", 92.129° remarks: * orbital elements for (1961)Dufour : Mean anomaly = 209.5859702778 deg Arg. of pericenter = 56.3960522918 deg Long. of node = 29.5594012861 deg Inclination = 6.6496538872 deg Eccentricity = 0.1256844240 Semimajor axis = 3.1906039970 AU Perihelion dist = 2.7895947713 AU Mag: H = 10.87, G = 0.15 Epoch of elements : MJD 60210.50812500 TDT (2023 Sep 23.5081) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#692023Aug22,3.77,2023,9,23,12.191878,0.026295,-0.112052,7.319206,1.736025,0.005834,0.000176,0.000000,0.000000 88.5414,-30.3270,-4.76,-0.09,False UCAC4 299-180457,18.20847746,-30.3315258,0.00,12.32,0.00,0.0,4,,18.23374609,-30.3270080,4.82,0.00,0,0,0 1961,Dufour,17.13,50.200,3.3563,0,0,1.482,4.55,,2.8,0 0,209.4981,2023,9,23,56.3961,29.5594,6.6497,0.12568,3.19060,2.78959,10.87,5.0,0.15 1.075,0.0057,0.0004,92,0.0057,Known errors,-1.00,0,-1,-1 20230923_180457,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org