IOTA/IOTA-ES occultation update for (1241) Dysona / UCAC4 305-269415 event on 2024 Oct 11, 23:57 UT Visible from Summary ------- On 2024 Oct 11 UT, the 79.099 km diameter asteroid (1241) Dysona will occult a 11.2 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.94 mag to 15.10 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: 2024 Oct 11, 23:52 - 2024 Oct 12, 00:02 * geocentric midpoint of event [JD]: 2460595.49809450 * magnitude of target star: 11.19 * magnitude drop [mag]: 3.94 * estimated maximum duration [s]: 3.850 * Moon: 62 % sunlit, 16° distance * Sun: 88° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.014) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.004", 62°) * approx speed of asteroid's shadow [km/s]: 20.5340 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 305-269415 by 1241 Dysona on 2024 Oct 11 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 170 0 0 -18 12 44 23 52 16.5 0 121 76 -18 38 31 .. .. .. -18 45 57 .. .. .. .... 171 0 0 -18 46 17 23 52 16.6 1 120 77 -19 11 55 -18 20 37 -19 19 17 -18 13 11 -0.05 172 0 0 -19 18 55 23 52 16.8 2 120 77 -19 44 23 -18 53 24 -19 51 43 -18 46 1 -0.15 173 0 0 -19 50 37 23 52 17.1 3 120 77 -20 15 55 -19 25 15 -20 23 13 -19 17 55 -0.19 174 0 0 -20 21 24 23 52 17.5 5 119 76 -20 46 33 -19 56 11 -20 53 48 -19 48 54 -0.21 175 0 0 -20 51 16 23 52 18.1 6 119 76 -21 16 17 -20 26 12 -21 23 29 -20 18 58 -0.22 176 0 0 -21 20 15 23 52 18.7 7 119 76 -21 45 6 -20 55 19 -21 52 16 -20 48 7 -0.23 177 0 0 -21 48 19 23 52 19.5 8 118 76 -22 13 3 -21 23 32 -22 20 10 -21 16 23 -0.24 178 0 0 -22 15 30 23 52 20.3 9 118 75 -22 40 6 -21 50 52 -22 47 11 -21 43 45 -0.24 179 0 0 -22 41 49 23 52 21.2 10 118 75 -23 6 16 -22 17 19 -23 13 19 -22 10 14 -0.25 -180 0 0 -23 7 16 23 52 22.3 11 117 74 -23 31 35 -22 42 53 -23 38 35 -22 35 51 -0.25 -179 0 0 -23 31 51 23 52 23.4 12 117 74 -23 56 2 -23 7 36 -24 3 1 -23 0 35 -0.25 -178 0 0 -23 55 34 23 52 24.6 13 116 73 -24 19 39 -23 31 27 -24 26 35 -23 24 29 -0.25 -177 0 0 -24 18 27 23 52 25.9 14 116 73 -24 42 25 -23 54 27 -24 49 19 -23 47 31 -0.26 -176 0 0 -24 40 30 23 52 27.2 15 116 72 -25 4 20 -24 16 37 -25 11 13 -24 9 43 -0.26 -175 0 0 -25 1 43 23 52 28.7 16 115 71 -25 25 27 -24 37 56 -25 32 17 -24 31 4 -0.26 -174 0 0 -25 22 7 23 52 30.2 17 115 71 -25 45 45 -24 58 27 -25 52 33 -24 51 37 -0.26 -173 0 0 -25 41 43 23 52 31.8 18 114 70 -26 5 14 -25 18 9 -26 12 1 -25 11 20 -0.26 -172 0 0 -26 0 30 23 52 33.5 19 114 69 -26 23 55 -25 37 2 -26 30 40 -25 30 16 -0.26 -171 0 0 -26 18 30 23 52 35.3 20 114 69 -26 41 49 -25 55 8 -26 48 33 -25 48 23 -0.26 -170 0 0 -26 35 42 23 52 37.1 21 113 68 -26 58 56 -26 12 26 -27 5 38 -26 5 42 -0.27 -169 0 0 -26 52 8 23 52 39.0 21 113 67 -27 15 17 -26 28 57 -27 21 57 -26 22 15 -0.27 -168 0 0 -27 7 47 23 52 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.. .. .. .. .. .. .. .. .. .. .. .. 43 26 2 .. .. .. .... Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 305-269415 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 15 56.3175 DE: -29 11 58.492 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 15 56.3175 DE: -29 11 58.492 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1241) Dysona asteroid class: approx. diameter [km]: 79 approx. diameter ["]: 0.040 distance from Earth [AU]: 2.75230 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#62 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): 0.030", 0.004", 62.127° remarks: * orbital elements for (1241)Dysona : Mean anomaly = 18.7480998946 deg Arg. of pericenter = 320.5631250009 deg Long. of node = 322.1526925599 deg Inclination = 23.5152023433 deg Eccentricity = 0.0998518431 Semimajor axis = 3.1895361955 AU Perihelion dist = 2.8710551278 AU Mag: H = 9.60, G = 0.15 Epoch of elements : MJD 60594.99809450 TDT (2024 Oct 11.9981) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#622023Apr24,3.85,2024,10,11,23.954268,-0.161103,0.218029,9.323134,6.885258,0.005738,0.000741,0.000000,0.000000 -90.9993,-29.1575,177.31,-7.50,False UCAC4 305-269415,19.26564379,-29.1995809,11.80,11.19,10.86,0.0,0,,19.29162223,-29.1575475,3.94,3.82,0,0,0 1241,Dysona,15.10,79.099,2.7523,0,0,2.275,22.00,,4.0,0 0,18.5754,2024,10,11,320.5631,322.1527,23.5152,0.09985,3.18954,2.87106,9.59,5.0,0.15 1.144,0.0297,0.0037,62,0.0057,Known errors,1.01,0,-1,-1 20241011_269415,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org