IOTA/IOTA-ES occultation update for (1241) Dysona / UCAC4 240-173850 event on 2024 Apr 01, 06:27 UT Visible from Summary ------- On 2024 Apr 01 UT, the 79.0703664575281 km diameter asteroid (1241) Dysona will occult a 10.2 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 5.00 mag to 15.14 mag (the magnitude of the asteroid) for at most 4.000 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: 97 * date and approx. time of event: 2024 Apr 01, 06:21 - 2024 Apr 01, 06:32 * geocentric midpoint of event [JD]: 2460401.76892284 * magnitude of target star: 10.15 * magnitude drop [mag]: 5.00 * estimated maximum duration [s]: 4.000 * Moon: 59 % sunlit, 23° distance * Sun: 84° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 83 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.016) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.002", 59°) * approx speed of asteroid's shadow [km/s]: 20.6167 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 240-173850 by 1241 Dysona on 2024 Apr 1 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 - 83 0 0 .. .. .... .. .. .. .. .. .. - 1 31 3 .. .. .. - 1 54 49 .. .. .. .... - 82 0 0 - 1 55 23 6 22 5.8 1 132 -77 - 2 25 37 - 1 25 9 - 2 49 24 - 1 1 25 .... - 81 0 0 - 2 49 58 6 22 6.0 2 132 -76 - 3 20 14 - 2 19 44 - 3 44 1 - 1 55 59 0.12 - 80 0 0 - 3 44 34 6 22 6.4 4 132 -75 - 4 14 50 - 3 14 19 - 4 38 37 - 2 50 34 0.10 - 79 0 0 - 4 39 7 6 22 7.0 5 132 -74 - 5 9 23 - 4 8 52 - 5 33 11 - 3 45 7 0.09 - 78 0 0 - 5 33 35 6 22 7.7 6 132 -73 - 6 3 51 - 5 3 21 - 6 27 38 - 4 39 36 0.08 - 77 0 0 - 6 27 56 6 22 8.6 8 132 -72 - 6 58 10 - 5 57 42 - 7 21 57 - 5 33 58 0.07 - 76 0 0 - 7 22 6 6 22 9.7 9 132 -71 - 7 52 19 - 6 51 54 - 8 16 5 - 6 28 11 0.07 - 75 0 0 - 8 16 3 6 22 10.9 10 131 -70 - 8 46 15 - 7 45 53 - 9 9 58 - 7 22 11 0.07 - 74 0 0 - 9 9 45 6 22 12.3 12 131 -69 - 9 39 54 - 8 39 37 -10 3 36 - 8 15 57 0.07 - 73 0 0 -10 3 9 6 22 13.9 13 131 -68 -10 33 15 - 9 33 4 -10 56 55 - 9 9 26 0.07 - 72 0 0 -10 56 12 6 22 15.6 14 131 -67 -11 26 15 -10 26 10 -11 49 52 -10 2 35 0.06 - 71 0 0 -11 48 52 6 22 17.5 16 131 -66 -12 18 52 -11 18 54 -12 42 26 -10 55 22 0.06 - 70 0 0 -12 41 8 6 22 19.5 17 130 -64 -13 11 3 -12 11 14 -13 34 34 -11 47 45 0.06 - 69 0 0 -13 32 56 6 22 21.6 18 130 -63 -14 2 46 -13 3 6 -14 26 14 -12 39 41 0.06 - 68 0 0 -14 24 14 6 22 23.9 20 130 -62 -14 54 0 -13 54 30 -15 17 24 -13 31 8 0.06 - 67 0 0 -15 15 1 6 22 26.4 21 130 -61 -15 44 42 -14 45 22 -16 8 1 -14 22 5 0.06 - 66 0 0 -16 5 15 6 22 28.9 22 129 -60 -16 34 50 -15 35 41 -16 58 5 -15 12 28 0.06 - 65 0 0 -16 54 53 6 22 31.6 24 129 -58 -17 24 22 -16 25 25 -17 47 32 -16 2 17 0.06 - 64 0 0 -17 43 55 6 22 34.4 25 129 -57 -18 13 17 -17 14 33 -18 36 22 -16 51 30 0.06 - 63 0 0 -18 32 17 6 22 37.3 26 129 -56 -19 1 33 -18 3 3 -19 24 33 -17 40 5 0.06 - 62 0 0 -19 20 0 6 22 40.3 27 128 -55 -19 49 9 -18 50 52 -20 12 4 -18 28 0 0.06 - 61 0 0 -20 7 2 6 22 43.5 29 128 -54 -20 36 3 -19 38 1 -20 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Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 240-173850 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 33 55.5751 DE: -42 07 00.022 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 33 55.5752 DE: -42 07 00.022 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.200) * V mag [mag]: 10.2 * B mag [mag]: 12.6 * Diameter [mas]: 1.70 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1241) Dysona asteroid class: approx. diameter [km]: 79 approx. diameter ["]: 0.039 distance from Earth [AU]: 2.81650 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", 0.002", 59° remarks: * orbital elements for (1241)Dysona : Mean anomaly = 345.2076418090 deg Arg. of pericenter = 320.5885656969 deg Long. of node = 322.1572520710 deg Inclination = 23.5129246536 deg Eccentricity = 0.1000133415 Semimajor axis = 3.1901139784 AU Perihelion dist = 2.8710600196 AU Mag: H = 9.60, G = 0.15 Epoch of elements : MJD 60401.26892245 TDT (2024 Apr 01.2689) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#622023Apr24,4.00,2024,4,1,6.454148,-0.000166,-0.039876,11.635808,-0.139443,-0.005606,-0.001219,0.000000,0.000000 6.9791,-42.0632,84.13,4.75,False UCAC4 240-173850,19.56543750,-42.1166729,12.59,10.15,8.83,1.7,4,,19.59344045,-42.0631968,5.00,5.87,0,0,0 1241,Dysona,15.14,82.543,2.8165,0,0,3.263,-0.43,,4.0,0 0,345.1611,2024,4,1,320.5886,322.1573,23.5129,0.10001,3.19011,2.87106,9.59,5.0,0.15 1.393,0.0300,0.0024,59,0.0159,Known errors,1.03,0,-1,-1 20240401_173850,60139.27 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org