IOTA/IOTA-ES occultation update for (1961) Dufour / UCAC4 294-204814 event on 2023 Jun 12, 13:20 UT Visible from New Zealand Summary ------- On 2023 Jun 12 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 New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.91 mag to 16.21 mag (the magnitude of the asteroid) for at most 3.850 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 Jun 12, 13:12 - 2023 Jun 12, 13:29 * geocentric midpoint of event [JD]: 2460108.05625175 * magnitude of target star: 12.33 * magnitude drop [mag]: 3.91 * estimated maximum duration [s]: 3.850 * Moon: 32 % sunlit, 92° distance * Sun: 159° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.001", 87°) * approx speed of asteroid's shadow [km/s]: 13.0558 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 294-204814 by 1961 Dufour on 2023 Jun 12 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 77 0 0 -20 25 2 13 29 0.8 0 123 -16 -20 8 30 -20 41 35 -20 4 7 -20 45 58 .... 78 0 0 -21 2 21 13 29 0.7 1 123 -17 -20 45 51 -21 18 52 -20 41 29 -21 23 15 0.22 79 0 0 -21 39 16 13 29 0.4 2 123 -18 -21 22 48 -21 55 44 -21 18 26 -22 0 7 0.20 80 0 0 -22 15 45 13 28 59.8 4 122 -19 -21 59 20 -22 32 11 -21 54 58 -22 36 33 0.18 81 0 0 -22 51 49 13 28 59.1 5 122 -20 -22 35 25 -23 8 13 -22 31 5 -23 12 34 0.18 82 0 0 -23 27 25 13 28 58.3 6 122 -21 -23 11 5 -23 43 47 -23 6 45 -23 48 8 0.18 83 0 0 -24 2 35 13 28 57.2 7 121 -22 -23 46 17 -24 18 54 -23 41 57 -24 23 14 0.17 84 0 0 -24 37 16 13 28 56.0 8 121 -23 -24 21 1 -24 53 33 -24 16 42 -24 57 52 0.17 85 0 0 -25 11 29 13 28 54.7 9 120 -24 -24 55 16 -25 27 43 -24 50 58 -25 32 2 0.17 86 0 0 -25 45 13 13 28 53.1 10 120 -25 -25 29 2 -26 1 24 -25 24 45 -26 5 42 0.17 87 0 0 -26 18 27 13 28 51.4 11 120 -26 -26 2 19 -26 34 36 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28 13 13 0.8 5 239 15 0 50 45 0 18 10 0 55 4 0 13 50 0.22 - 91 0 0 1 12 18 13 13 0.1 3 239 16 1 28 33 0 56 3 1 32 52 0 51 43 0.24 - 90 0 0 1 49 50 13 12 59.6 2 239 17 2 6 3 1 33 36 2 10 21 1 29 18 0.28 - 89 0 0 2 27 2 13 12 59.4 1 239 19 2 43 12 2 10 50 2 47 30 2 6 33 0.41 - 88 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 2 47 44 .. .. .. 2 43 26 .... Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 294-204814 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 48 41.4659 DE: -31 17 59.336 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 48 41.4659 DE: -31 17 59.336 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * 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 ["]: 0.026 distance from Earth [AU]: 2.61890 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", 86.877° remarks: * orbital elements for (1961)Dufour : Mean anomaly = 191.7902867127 deg Arg. of pericenter = 56.3852766568 deg Long. of node = 29.5599362422 deg Inclination = 6.6496682424 deg Eccentricity = 0.1255332880 Semimajor axis = 3.1910320069 AU Perihelion dist = 2.7904512669 AU Mag: H = 10.88, G = 0.15 Epoch of elements : MJD 60107.55618055 TDT (2023 Jun 12.5562) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#662023Apr24,3.85,2023,6,12,13.350042,0.041577,-0.171246,-7.161430,-1.736871,-0.001999,0.000606,0.000001,0.000000 -178.3087,-31.2734,-20.29,23.16,False UCAC4 294-204814,18.81151829,-31.2998155,0.00,12.33,0.00,0.0,4,,18.83693773,-31.2733588,3.91,0.00,0,0,0 1961,Dufour,16.21,50.2,2.6189,0,0,-1.876,-5.83,,2.8,0 0,191.6941,2023,6,12,56.3853,29.5599,6.6497,0.12553,3.19103,2.79045,10.88,5.0,0.15 1.133,0.0177,0.0014,87,0.0035,Known errors,-1.00,-1,-1,-1 20230612_204814,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org