IOTA/IOTA-ES occultation update for (2591) Dworetsky / UCAC4 329-164847 event on 2024 Oct 19, 22:03 UT Visible from Summary ------- On 2024 Oct 19 UT, the 12.8087387099771 km diameter asteroid (2591) Dworetsky will occult a 10.9 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 6.33 mag to 17.23 mag (the magnitude of the asteroid) for at most 0.490 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 19, 21:59 - 2024 Oct 19, 22:07 * geocentric midpoint of event [JD]: 2460603.41939870 * magnitude of target star: 10.90 * magnitude drop [mag]: 6.33 * estimated maximum duration [s]: 0.490 * Moon: 91 % sunlit, 143° distance * Sun: 72° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.001", 86°) * approx speed of asteroid's shadow [km/s]: 26.7303 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 329-164847 by 2591 Dworetsky on 2024 Oct 19 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 -176 0 0 -15 28 33 22 0 2.2 0 115 68 -15 32 33 -15 24 34 -15 33 53 .. .. .. .... -175 0 0 -15 56 3 22 0 2.3 1 115 69 -16 0 2 -15 52 3 -16 1 22 -15 50 43 0.25 -174 0 0 -16 23 25 22 0 2.4 2 115 69 -16 27 24 -16 19 26 -16 28 44 -16 18 6 0.23 -173 0 0 -16 50 39 22 0 2.6 3 114 70 -16 54 38 -16 46 40 -16 55 58 -16 45 20 0.22 -172 0 0 -17 17 44 22 0 2.9 4 114 71 -17 21 43 -17 13 45 -17 23 3 -17 12 25 0.22 -171 0 0 -17 44 39 22 0 3.3 5 114 72 -17 48 38 -17 40 40 -17 49 58 -17 39 20 0.22 -170 0 0 -18 11 24 22 0 3.8 6 114 72 -18 15 22 -18 7 25 -18 16 42 -18 6 5 0.21 -169 0 0 -18 37 58 22 0 4.3 7 113 73 -18 41 56 -18 33 59 -18 43 16 -18 32 40 0.21 -168 0 0 -19 4 20 22 0 4.9 8 113 74 -19 8 19 -19 0 22 -19 9 38 -18 59 3 0.21 -167 0 0 -19 30 31 22 0 5.6 10 113 74 -19 34 29 -19 26 33 -19 35 49 -19 25 13 0.21 -166 0 0 -19 56 29 22 0 6.4 11 112 75 -20 0 27 -19 52 31 -20 1 46 -19 51 11 0.21 -165 0 0 -20 22 13 22 0 7.2 12 112 75 -20 26 11 -20 18 16 -20 27 30 -20 16 56 0.21 -164 0 0 -20 47 44 22 0 8.2 13 112 76 -20 51 41 -20 43 47 -20 53 1 -20 42 27 0.21 -163 0 0 -21 13 0 22 0 9.2 14 111 76 -21 16 57 -21 9 3 -21 18 16 -21 7 44 0.21 -162 0 0 -21 38 2 22 0 10.2 15 111 76 -21 41 58 -21 34 5 -21 43 18 -21 32 46 0.21 -161 0 0 -22 2 48 22 0 11.4 16 110 76 -22 6 44 -21 58 51 -22 8 3 -21 57 32 0.21 -160 0 0 -22 27 18 22 0 12.6 17 110 77 -22 31 14 -22 23 22 -22 32 33 -22 22 3 0.21 -159 0 0 -22 51 32 22 0 13.8 18 110 77 -22 55 28 -22 47 36 -22 56 46 -22 46 17 0.21 -158 0 0 -23 15 29 22 0 15.2 19 109 77 -23 19 24 -23 11 33 -23 20 43 -23 10 15 0.21 -157 0 0 -23 39 9 22 0 16.6 20 109 76 -23 43 4 -23 35 14 -23 44 22 -23 33 55 0.21 -156 0 0 -24 2 31 22 0 18.1 21 108 76 -24 6 26 -23 58 36 -24 7 44 -23 57 18 0.21 -155 0 0 -24 25 35 22 0 19.6 22 108 76 -24 29 29 -24 21 41 -24 30 48 -24 20 23 0.21 -154 0 0 -24 48 21 22 0 21.2 23 107 76 -24 52 15 -24 44 27 -24 53 33 -24 43 9 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249 -51 -14 5 7 -13 57 7 -14 6 28 -13 55 47 0.22 - 6 0 0 -13 33 0 22 7 36.5 19 249 -52 -13 37 1 -13 29 0 -13 38 21 -13 27 40 0.22 - 5 0 0 -13 4 50 22 7 38.0 18 248 -53 -13 8 50 -13 0 50 -13 10 10 -12 59 29 0.22 - 4 0 0 -12 36 36 22 7 39.4 17 248 -54 -12 40 36 -12 32 35 -12 41 56 -12 31 15 0.22 - 3 0 0 -12 8 19 22 7 40.7 16 248 -55 -12 12 19 -12 4 19 -12 13 39 -12 2 59 0.22 - 2 0 0 -11 40 0 22 7 41.9 15 248 -56 -11 44 1 -11 36 0 -11 45 21 -11 34 40 0.23 - 1 0 0 -11 11 41 22 7 43.0 14 247 -57 -11 15 41 -11 7 41 -11 17 1 -11 6 21 0.23 0 0 0 -10 43 21 22 7 44.1 13 247 -58 -10 47 21 -10 39 22 -10 48 42 -10 38 1 0.23 1 0 0 -10 15 2 22 7 45.1 12 247 -59 -10 19 2 -10 11 2 -10 20 22 -10 9 42 0.23 2 0 0 - 9 46 44 22 7 46.0 10 247 -60 - 9 50 44 - 9 42 45 - 9 52 4 - 9 41 25 0.23 3 0 0 - 9 18 29 22 7 46.8 9 247 -61 - 9 22 28 - 9 14 29 - 9 23 49 - 9 13 9 0.24 4 0 0 - 8 50 16 22 7 47.5 8 246 -62 - 8 54 15 - 8 46 16 - 8 55 35 - 8 44 56 0.24 5 0 0 - 8 22 6 22 7 48.1 7 246 -63 - 8 26 6 - 8 18 7 - 8 27 26 - 8 16 47 0.25 6 0 0 - 7 54 1 22 7 48.7 6 246 -64 - 7 58 1 - 7 50 2 - 7 59 21 - 7 48 42 0.25 7 0 0 - 7 26 2 22 7 49.1 5 246 -65 - 7 30 1 - 7 22 3 - 7 31 21 - 7 20 43 0.26 8 0 0 - 6 58 7 22 7 49.5 4 246 -66 - 7 2 6 - 6 54 9 - 7 3 26 - 6 52 49 0.28 9 0 0 - 6 30 20 22 7 49.8 3 246 -67 - 6 34 19 - 6 26 21 - 6 35 38 - 6 25 2 0.30 10 0 0 - 6 2 40 22 7 49.9 2 246 -68 - 6 6 38 - 5 58 41 - 6 7 58 - 5 57 22 0.36 11 0 0 - 5 35 7 22 7 50.0 1 246 -69 - 5 39 6 - 5 31 9 - 5 40 25 - 5 29 50 0.63 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 329-164847 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 38 27.2986 DE: -24 23 14.242 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 38 27.2985 DE: -24 23 14.242 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.9 * B mag [mag]: 11.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2591) Dworetsky asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.98180 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 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): 0.013", 0.001", 85.619° remarks: * orbital elements for (2591)Dworetsky : Mean anomaly = 30.2731066533 deg Arg. of pericenter = 269.5282860147 deg Long. of node = 356.0272446048 deg Inclination = 1.5402986304 deg Eccentricity = 0.0401238899 Semimajor axis = 2.9389389564 AU Perihelion dist = 2.8210172932 AU Mag: H = 11.62, G = 0.15 Epoch of elements : MJD 60602.91939862 TDT (2024 Oct 19.9194) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.49,2024,10,19,22.065569,0.018725,-0.196040,15.016670,1.458561,0.005499,0.000339,0.000000,0.000000 -79.8602,-24.3666,-154.78,-10.41,False UCAC4 329-164847,18.64091630,-24.3872894,11.52,10.90,10.57,0.1,0,,18.66602942,-24.3666362,6.33,6.22,0,0,0 2591,Dworetsky,17.23,13.025,2.9818,0,0,3.242,4.31,,1.2,0 0,30.0933,2024,10,19,269.5283,356.0272,1.5403,0.04012,2.93894,2.82102,11.61,5.0,0.15 1.167,0.0133,0.0010,86,0.0010,Known errors,0.71,0,-1,-1 20241019_164847,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org