IOTA/IOTA-ES occultation update for (2591) Dworetsky / HIP 91182 event on 2024 Oct 18, 02:36 UT Visible from Summary ------- On 2024 Oct 18 UT, the 12.9249152042278 km diameter asteroid (2591) Dworetsky will occult a 8.1 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 9.11 mag to 17.22 mag (the magnitude of the asteroid) for at most 0.510 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 18, 02:33 - 2024 Oct 18, 02:40 * geocentric midpoint of event [JD]: 2460601.60892563 * magnitude of target star: 8.11 * magnitude drop [mag]: 9.11 * estimated maximum duration [s]: 0.510 * Moon: 99 % sunlit, 115° distance * Sun: 73° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 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]: 26.0924 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 91182 by 2591 Dworetsky on 2024 Oct 18 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 112 0 0 -25 11 55 2 33 4.9 0 117 61 -25 16 19 -25 7 30 -25 17 47 -25 6 3 .... 113 0 0 -25 39 52 2 33 5.0 1 117 61 -25 44 17 -25 35 28 -25 45 44 -25 34 0 0.38 114 0 0 -26 7 42 2 33 5.1 2 116 62 -26 12 7 -26 3 18 -26 13 34 -26 1 50 0.40 115 0 0 -26 35 24 2 33 5.3 3 116 63 -26 39 49 -26 31 0 -26 41 16 -26 29 33 0.40 116 0 0 -27 2 58 2 33 5.6 4 115 63 -27 7 22 -26 58 33 -27 8 49 -26 57 6 0.41 117 0 0 -27 30 22 2 33 6.0 5 115 63 -27 34 46 -27 25 58 -27 36 14 -27 24 31 0.41 118 0 0 -27 57 37 2 33 6.5 6 114 64 -28 2 1 -27 53 13 -28 3 28 -27 51 46 0.41 119 0 0 -28 24 40 2 33 7.0 7 114 64 -28 29 4 -28 20 17 -28 30 31 -28 18 50 0.41 120 0 0 -28 51 33 2 33 7.6 8 113 65 -28 55 57 -28 47 9 -28 57 24 -28 45 42 0.41 121 0 0 -29 18 14 2 33 8.3 9 113 65 -29 22 37 -29 13 50 -29 24 4 -29 12 23 0.41 122 0 0 -29 44 42 2 33 9.1 10 112 65 -29 49 5 -29 40 19 -29 50 32 -29 38 52 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36.7 4 246 -62 -17 2 31 -16 53 47 -17 3 57 -16 52 20 0.53 - 53 0 0 -16 30 6 2 40 36.9 2 245 -62 -16 34 28 -16 25 44 -16 35 54 -16 24 18 0.57 - 52 0 0 -16 2 11 2 40 37.1 1 245 -63 -16 6 33 -15 57 50 -16 7 59 -15 56 24 0.69 - 51 0 0 -15 34 26 2 40 37.2 0 245 -64 -15 38 47 -15 30 5 -15 40 13 -15 28 39 1.56 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: HIP 91182 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 36 07.4776 DE: -24 26 11.237 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 36 07.4774 DE: -24 26 11.237 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 8.1 * B mag [mag]: 8.7 * Diameter [mas]: 0.20 * 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]: 2.95810 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", 85.862° remarks: * orbital elements for (2591)Dworetsky : Mean anomaly = 29.9172109999 deg Arg. of pericenter = 269.5299497351 deg Long. of node = 356.0273337403 deg Inclination = 1.5402971313 deg Eccentricity = 0.0401254510 Semimajor axis = 2.9389449428 AU Perihelion dist = 2.8210184516 AU Mag: H = 11.62, G = 0.15 Epoch of elements : MJD 60601.10892546 TDT (2024 Oct 18.1089) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.51,2024,10,18,2.614215,0.036184,-0.376830,14.662584,1.378863,0.005520,0.000321,0.000000,0.000000 -146.8877,-24.4172,137.07,-9.76,False HIP 91182,18.60207715,-24.4364546,8.74,8.11,7.77,0.2,0,,18.62720884,-24.4172181,9.11,9.00,0,0,0 2591,Dworetsky,17.22,13.354,2.9581,0,0,3.192,4.10,,1.2,0 0,29.8959,2024,10,18,269.5299,356.0273,1.5403,0.04013,2.93894,2.82102,11.61,5.0,0.15 1.165,0.0133,0.0010,86,0.0010,Known errors,0.86,0,-1,-1 20241018__91182,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org