IOTA/IOTA-ES occultation update for (2591) Dworetsky / UCAC4 329-166333 event on 2024 Oct 21, 01:41 UT Visible from Summary ------- On 2024 Oct 21 UT, the 12.9486435508519 km diameter asteroid (2591) Dworetsky will occult a 11.5 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 5.76 mag to 17.24 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 21, 01:38 - 2024 Oct 21, 01:45 * geocentric midpoint of event [JD]: 2460604.57081708 * magnitude of target star: 11.49 * magnitude drop [mag]: 5.76 * estimated maximum duration [s]: 0.490 * Moon: 82 % sunlit, 158° distance * Sun: 71° 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]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.001", 85°) * approx speed of asteroid's shadow [km/s]: 27.1334 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 329-166333 by 2591 Dworetsky on 2024 Oct 21 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 137 0 0 1 27 48 1 38 5.6 0 114 71 1 23 51 1 31 45 1 22 33 1 33 3 .... 138 0 0 1 0 36 1 38 5.7 2 114 72 0 56 39 1 4 33 0 55 21 1 5 51 0.01 139 0 0 0 33 33 1 38 5.9 3 114 73 0 29 37 0 37 30 0 28 19 0 38 48 -0.04 140 0 0 0 6 40 1 38 6.1 4 114 74 0 2 44 0 10 36 0 1 26 0 11 54 -0.07 141 0 0 - 0 20 3 1 38 6.5 5 114 75 - 0 23 59 - 0 16 7 - 0 25 17 - 0 14 49 -0.08 142 0 0 - 0 46 36 1 38 6.9 6 114 76 - 0 50 32 - 0 42 40 - 0 51 50 - 0 41 22 -0.09 143 0 0 - 1 12 57 1 38 7.4 7 114 77 - 1 16 52 - 1 9 2 - 1 18 10 - 1 7 44 -0.09 144 0 0 - 1 39 6 1 38 8.0 8 114 78 - 1 43 1 - 1 35 11 - 1 44 19 - 1 33 53 -0.10 145 0 0 - 2 5 2 1 38 8.7 9 114 79 - 2 8 57 - 2 1 7 - 2 10 15 - 1 59 50 -0.10 146 0 0 - 2 30 45 1 38 9.4 10 114 80 - 2 34 40 - 2 26 51 - 2 35 57 - 2 25 33 -0.10 147 0 0 - 2 56 14 1 38 10.3 11 114 81 - 3 0 9 - 2 52 20 - 3 1 26 - 2 51 3 -0.11 148 0 0 - 3 21 29 1 38 11.2 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54 -10 28 42 -10 18 39 -0.13 -103 0 0 -10 4 24 1 44 7.3 56 241 -14 -10 8 11 -10 0 37 -10 9 27 - 9 59 22 -0.13 -102 0 0 - 9 44 45 1 44 10.9 55 241 -15 - 9 48 33 - 9 40 57 - 9 49 48 - 9 39 42 -0.13 -101 0 0 - 9 24 43 1 44 14.4 54 241 -16 - 9 28 31 - 9 20 55 - 9 29 46 - 9 19 40 -0.13 -100 0 0 - 9 4 19 1 44 17.9 53 241 -18 - 9 8 7 - 9 0 30 - 9 9 23 - 8 59 15 -0.13 - 99 0 0 - 8 43 32 1 44 21.4 52 241 -19 - 8 47 21 - 8 39 43 - 8 48 37 - 8 38 28 -0.13 - 98 0 0 - 8 22 24 1 44 24.8 51 241 -20 - 8 26 14 - 8 18 35 - 8 27 29 - 8 17 19 -0.13 - 97 0 0 - 8 0 55 1 44 28.2 50 242 -21 - 8 4 45 - 7 57 5 - 8 6 0 - 7 55 49 -0.13 - 96 0 0 - 7 39 4 1 44 31.5 48 242 -22 - 7 42 55 - 7 35 14 - 7 44 11 - 7 33 58 -0.13 - 95 0 0 - 7 16 53 1 44 34.8 47 242 -23 - 7 20 44 - 7 13 3 - 7 22 0 - 7 11 47 -0.13 - 94 0 0 - 6 54 22 1 44 38.0 46 242 -24 - 6 58 13 - 6 50 31 - 6 59 29 - 6 49 15 -0.13 - 93 0 0 - 6 31 31 1 44 41.2 45 242 -25 - 6 35 22 - 6 27 40 - 6 36 39 - 6 26 23 -0.13 - 92 0 0 - 6 8 21 1 44 44.4 44 242 -26 - 6 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53 0 0 11 22 32 1 45 51.7 2 245 -68 11 18 34 11 26 31 11 17 15 11 27 49 -0.07 - 52 0 0 11 50 5 1 45 51.7 0 245 -69 11 46 7 11 54 4 11 44 49 11 55 22 0.06 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 329-166333 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 39 57.3392 DE: -24 21 17.693 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 39 57.3392 DE: -24 21 17.693 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * B mag [mag]: 12.7 * 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]: 2.99690 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", 85.463° remarks: * orbital elements for (2591)Dworetsky : Mean anomaly = 30.4994655731 deg Arg. of pericenter = 269.5272118048 deg Long. of node = 356.0271871709 deg Inclination = 1.5402996081 deg Eccentricity = 0.0401228877 Semimajor axis = 2.9389351039 AU Perihelion dist = 2.8210165409 AU Mag: H = 11.62, G = 0.15 Epoch of elements : MJD 60604.07081716 TDT (2024 Oct 21.0708) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.49,2024,10,21,1.699610,-0.013245,0.129218,15.240131,1.511057,0.005486,0.000351,0.000000,0.000000 -135.1307,-24.3334,150.66,-10.82,False UCAC4 329-166333,18.66592759,-24.3549147,12.72,11.49,10.83,0.1,0,,18.69103049,-24.3333556,5.75,5.97,0,0,0 2591,Dworetsky,17.24,13.166,2.9969,0,0,3.273,4.44,,1.2,0 0,30.2900,2024,10,20,269.5272,356.0272,1.5403,0.04012,2.93894,2.82102,11.61,5.0,0.15 1.165,0.0130,0.0010,85,0.0010,Known errors,0.94,0,-1,-1 20241021_166333,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org