IOTA/IOTA-ES occultation update for (9352) 1991 UB4 / TYC 6290-00238-1 event on 2024 Nov 19, 17:46 UT Visible from Summary ------- On 2024 Nov 19 UT, the 11.461 km diameter asteroid (9352) 1991 UB4 will occult a 11.6 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 7.50 mag to 19.13 mag (the magnitude of the asteroid) for at most 0.310 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 Nov 19, 17:43 - 2024 Nov 19, 17:49 * geocentric midpoint of event [JD]: 2460634.24043675 * magnitude of target star: 11.63 * magnitude drop [mag]: 7.50 * estimated maximum duration [s]: 0.310 * Moon: 81 % sunlit, 171° distance * Sun: 47° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.002", 85°) * approx speed of asteroid's shadow [km/s]: 37.1236 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6290-00238-1 by 9352 1991 UB4 on 2024 Nov 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 -128 0 0 1 28 7 17 43 22.9 1 110 47 1 24 48 1 31 26 1 22 36 1 33 38 .... -127 0 0 1 6 37 17 43 23.0 2 110 48 1 3 18 1 9 56 1 1 6 1 12 8 0.01 -126 0 0 0 45 13 17 43 23.1 3 110 49 0 41 54 0 48 32 0 39 43 0 50 44 -0.04 -125 0 0 0 23 56 17 43 23.3 4 110 50 0 20 38 0 27 15 0 18 26 0 29 27 -0.06 -124 0 0 0 2 47 17 43 23.5 5 110 51 - 0 0 32 0 6 5 - 0 2 43 0 8 17 -0.07 -123 0 0 - 0 18 15 17 43 23.8 6 110 52 - 0 21 34 - 0 14 57 - 0 23 45 - 0 12 45 -0.07 -122 0 0 - 0 39 9 17 43 24.2 7 110 53 - 0 42 28 - 0 35 51 - 0 44 39 - 0 33 40 -0.08 -121 0 0 - 0 59 55 17 43 24.6 8 110 54 - 1 3 13 - 0 56 36 - 1 5 24 - 0 54 25 -0.08 -120 0 0 - 1 20 31 17 43 25.0 9 110 55 - 1 23 49 - 1 17 13 - 1 26 0 - 1 15 2 -0.08 -119 0 0 - 1 40 57 17 43 25.6 10 110 56 - 1 44 15 - 1 37 40 - 1 46 26 - 1 35 28 -0.09 -118 0 0 - 2 1 14 17 43 26.2 11 110 57 - 2 4 32 - 1 57 56 - 2 6 43 - 1 55 45 -0.09 -117 0 0 - 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4 59 6 - 4 52 34 - 5 1 16 - 4 50 24 -0.10 5 0 0 - 4 37 17 17 48 17.3 43 247 -4 - 4 40 33 - 4 34 0 - 4 42 43 - 4 31 50 -0.10 6 0 0 - 4 18 30 17 48 19.5 42 247 -5 - 4 21 46 - 4 15 13 - 4 23 56 - 4 13 3 -0.10 7 0 0 - 3 59 29 17 48 21.6 41 247 -6 - 4 2 46 - 3 56 12 - 4 4 56 - 3 54 2 -0.10 8 0 0 - 3 40 16 17 48 23.7 40 247 -7 - 3 43 33 - 3 36 59 - 3 45 43 - 3 34 48 -0.10 9 0 0 - 3 20 50 17 48 25.7 39 247 -8 - 3 24 7 - 3 17 33 - 3 26 17 - 3 15 22 -0.10 10 0 0 - 3 1 11 17 48 27.7 38 247 -9 - 3 4 29 - 2 57 54 - 3 6 39 - 2 55 43 -0.10 11 0 0 - 2 41 21 17 48 29.6 37 247 -10 - 2 44 39 - 2 38 4 - 2 46 50 - 2 35 53 -0.10 12 0 0 - 2 21 20 17 48 31.5 36 247 -11 - 2 24 38 - 2 18 2 - 2 26 48 - 2 15 51 -0.10 13 0 0 - 2 1 7 17 48 33.4 35 247 -12 - 2 4 25 - 1 57 50 - 2 6 36 - 1 55 39 -0.10 14 0 0 - 1 40 44 17 48 35.2 34 247 -13 - 1 44 2 - 1 37 26 - 1 46 14 - 1 35 15 -0.10 15 0 0 - 1 20 11 17 48 37.0 33 247 -14 - 1 23 29 - 1 16 53 - 1 25 41 - 1 14 42 -0.10 16 0 0 - 0 59 28 17 48 38.7 32 247 -15 - 1 2 47 - 0 56 10 - 1 4 58 - 0 53 59 -0.10 17 0 0 - 0 38 36 17 48 40.3 31 247 -16 - 0 41 55 - 0 35 18 - 0 44 6 - 0 33 7 -0.10 18 0 0 - 0 17 36 17 48 42.0 30 247 -18 - 0 20 54 - 0 14 17 - 0 23 6 - 0 12 6 -0.10 19 0 0 0 3 33 17 48 43.5 29 247 -19 0 0 14 0 6 52 - 0 1 57 0 9 4 -0.10 20 0 0 0 24 50 17 48 45.0 28 247 -20 0 21 31 0 28 9 0 19 19 0 30 21 -0.10 21 0 0 0 46 14 17 48 46.5 26 248 -21 0 42 55 0 49 33 0 40 43 0 51 45 -0.10 22 0 0 1 7 45 17 48 47.9 25 248 -22 1 4 26 1 11 4 1 2 14 1 13 16 -0.10 23 0 0 1 29 22 17 48 49.2 24 248 -23 1 26 3 1 32 41 1 23 51 1 34 53 -0.10 24 0 0 1 51 5 17 48 50.5 23 248 -24 1 47 46 1 54 25 1 45 34 1 56 37 -0.10 25 0 0 2 12 53 17 48 51.8 22 248 -25 2 9 34 2 16 13 2 7 22 2 18 25 -0.10 26 0 0 2 34 47 17 48 53.0 21 248 -26 2 31 27 2 38 6 2 29 15 2 40 18 -0.10 27 0 0 2 56 44 17 48 54.1 20 248 -27 2 53 24 3 0 4 2 51 12 3 2 16 -0.10 28 0 0 3 18 45 17 48 55.2 19 248 -28 3 15 25 3 22 5 3 13 13 3 24 17 -0.10 29 0 0 3 40 49 17 48 56.2 18 248 -29 3 37 30 3 44 9 3 35 17 3 46 21 -0.10 30 0 0 4 2 57 17 48 57.2 17 248 -30 3 59 37 4 6 16 3 57 24 4 8 29 -0.10 31 0 0 4 25 6 17 48 58.1 16 248 -31 4 21 46 4 28 26 4 19 34 4 30 38 -0.10 32 0 0 4 47 17 17 48 58.9 15 248 -32 4 43 57 4 50 37 4 41 45 4 52 49 -0.10 33 0 0 5 9 29 17 48 59.7 14 248 -34 5 6 9 5 12 49 5 3 57 5 15 1 -0.10 34 0 0 5 31 42 17 49 0.4 13 248 -35 5 28 22 5 35 2 5 26 9 5 37 14 -0.10 35 0 0 5 53 55 17 49 1.1 12 249 -36 5 50 35 5 57 15 5 48 22 5 59 27 -0.10 36 0 0 6 16 7 17 49 1.7 10 249 -37 6 12 47 6 19 27 6 10 35 6 21 39 -0.10 37 0 0 6 38 19 17 49 2.2 9 249 -38 6 34 59 6 41 38 6 32 46 6 43 51 -0.10 38 0 0 7 0 29 17 49 2.7 8 249 -39 6 57 9 7 3 49 6 54 56 7 6 1 -0.09 39 0 0 7 22 37 17 49 3.2 7 249 -40 7 19 17 7 25 57 7 17 4 7 28 9 -0.09 40 0 0 7 44 42 17 49 3.5 6 249 -41 7 41 22 7 48 2 7 39 10 7 50 14 -0.09 41 0 0 8 6 45 17 49 3.9 5 249 -42 8 3 25 8 10 5 8 1 13 8 12 17 -0.09 42 0 0 8 28 44 17 49 4.1 4 249 -43 8 25 24 8 32 4 8 23 12 8 34 16 -0.09 43 0 0 8 50 39 17 49 4.3 3 250 -44 8 47 19 8 53 59 8 45 7 8 56 11 -0.08 44 0 0 9 12 30 17 49 4.4 2 250 -45 9 9 10 9 15 49 9 6 58 9 18 2 -0.07 45 0 0 9 34 15 17 49 4.5 1 250 -46 9 30 56 9 37 35 9 28 44 9 39 47 -0.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6290-00238-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 02 26.5941 DE: -19 42 27.387 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 02 26.5939 DE: -19 42 27.387 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.6 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9352) 1991 UB4 asteroid class: approx. diameter [km]: 11 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.48730 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#46 date of fit: 2023 Apr 25 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): 0.008", 0.001", 85.2° remarks: * orbital elements for (9352)1991 UB4 : Mean anomaly = 135.0454137955 deg Arg. of pericenter = 325.5682651594 deg Long. of node = 189.2615110507 deg Inclination = 3.7468568345 deg Eccentricity = 0.1275450647 Semimajor axis = 2.6499994106 AU Perihelion dist = 2.3120050643 AU Mag: H = 13.30, G = 0.15 Epoch of elements : MJD 60633.74043659 TDT (2024 Nov 19.7404) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#462023Apr25,0.31,2024,11,19,17.770482,-0.008052,0.105933,20.893266,1.589051,0.004300,0.000677,-0.000001,0.000000 -39.8305,-19.6725,-90.17,-19.69,False TYC 6290-00238-1,19.04072063,-19.7076074,11.93,11.63,11.47,0.0,0,,19.06485017,-19.6725217,7.51,7.22,0,0,0 9352,1991 UB4,19.13,11.461,3.4873,0,0,3.731,4.01,,1.0,0 0,134.8762,2024,11,19,325.5683,189.2615,3.7469,0.12755,2.65000,2.31201,13.29,5.0,0.15 1.331,0.0080,0.0015,85,0.0015,Known errors,1.23,0,-1,-1 20241119_0238-1,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org