IOTA/IOTA-ES occultation update for (9352) 1991 UB4 / UCAC4 351-156209 event on 2024 Nov 08, 19:54 UT Visible from Summary ------- On 2024 Nov 08 UT, the 11.3392146776598 km diameter asteroid (9352) 1991 UB4 will occult a 10.3 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 8.79 mag to 19.11 mag (the magnitude of the asteroid) for at most 0.340 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 08, 19:51 - 2024 Nov 08, 19:57 * geocentric midpoint of event [JD]: 2460623.32923141 * magnitude of target star: 10.32 * magnitude drop [mag]: 8.79 * estimated maximum duration [s]: 0.340 * Moon: 45 % sunlit, 31° distance * Sun: 54° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.001", 86°) * approx speed of asteroid's shadow [km/s]: 34.2249 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 351-156209 by 9352 1991 UB4 on 2024 Nov 8 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 -149 0 0 13 12 28 19 51 7.1 0 111 50 13 8 58 13 15 58 13 6 45 13 18 11 .... -148 0 0 12 50 35 19 51 7.2 1 111 51 12 47 5 12 54 4 12 44 52 12 56 17 -0.10 -147 0 0 12 28 46 19 51 7.3 2 111 52 12 25 16 12 32 15 12 23 3 12 34 28 -0.18 -146 0 0 12 7 1 19 51 7.5 4 111 52 12 3 32 12 10 30 12 1 19 12 12 43 -0.21 -145 0 0 11 45 22 19 51 7.7 5 111 53 11 41 52 11 48 51 11 39 40 11 51 3 -0.23 -144 0 0 11 23 47 19 51 8.0 6 112 54 11 20 18 11 27 17 11 18 6 11 29 29 -0.24 -143 0 0 11 2 20 19 51 8.4 7 112 55 10 58 51 11 5 48 10 56 38 11 8 1 -0.25 -142 0 0 10 40 58 19 51 8.8 8 112 56 10 37 29 10 44 27 10 35 17 10 46 39 -0.26 -141 0 0 10 19 44 19 51 9.3 9 112 57 10 16 15 10 23 13 10 14 3 10 25 25 -0.26 -140 0 0 9 58 37 19 51 9.9 10 112 58 9 55 9 10 2 6 9 52 57 10 4 18 -0.26 -139 0 0 9 37 39 19 51 10.6 11 113 59 9 34 10 9 41 7 9 31 58 9 43 19 -0.27 -138 0 0 9 16 48 19 51 11.3 12 113 59 9 13 20 9 20 17 9 11 8 9 22 29 -0.27 -137 0 0 8 56 7 19 51 12.0 13 113 60 8 52 40 8 59 35 8 50 28 9 1 47 -0.27 -136 0 0 8 35 36 19 51 12.8 14 113 61 8 32 8 8 39 4 8 29 57 8 41 16 -0.27 -135 0 0 8 15 15 19 51 13.7 15 113 62 8 11 47 8 18 42 8 9 36 8 20 54 -0.28 -134 0 0 7 55 4 19 51 14.7 16 113 62 7 51 36 7 58 31 7 49 25 8 0 43 -0.28 -133 0 0 7 35 4 19 51 15.7 17 114 63 7 31 37 7 38 31 7 29 25 7 40 42 -0.28 -132 0 0 7 15 15 19 51 16.8 18 114 64 7 11 48 7 18 42 7 9 37 7 20 53 -0.28 -131 0 0 6 55 38 19 51 17.9 19 114 65 6 52 12 6 59 5 6 50 1 7 1 16 -0.28 -130 0 0 6 36 14 19 51 19.1 20 114 65 6 32 47 6 39 40 6 30 36 6 41 51 -0.28 -129 0 0 6 17 2 19 51 20.4 21 114 66 6 13 36 6 20 28 6 11 25 6 22 39 -0.28 -128 0 0 5 58 3 19 51 21.7 22 114 66 5 54 37 6 1 29 5 52 27 6 3 40 -0.28 -127 0 0 5 39 18 19 51 23.1 23 115 67 5 35 52 5 42 44 5 33 42 5 44 54 -0.28 -126 0 0 5 20 47 19 51 24.5 24 115 67 5 17 21 5 24 12 5 15 11 5 26 23 -0.28 -125 0 0 5 2 30 19 51 26.0 25 115 68 4 59 5 5 5 55 4 56 54 5 8 5 -0.28 -124 0 0 4 44 28 19 51 27.6 26 115 68 4 41 3 4 47 53 4 38 53 4 50 3 -0.29 -123 0 0 4 26 41 19 51 29.2 28 115 69 4 23 16 4 30 5 4 21 6 4 32 15 -0.29 -122 0 0 4 9 9 19 51 30.9 29 115 69 4 5 44 4 12 33 4 3 35 4 14 43 -0.29 -121 0 0 3 51 53 19 51 32.6 30 115 69 3 48 29 3 55 17 3 46 19 3 57 27 -0.29 -120 0 0 3 34 53 19 51 34.4 31 116 69 3 31 29 3 38 17 3 29 20 3 40 27 -0.29 -119 0 0 3 18 10 19 51 36.2 32 116 70 3 14 46 3 21 34 3 12 37 3 23 43 -0.29 -118 0 0 3 1 43 19 51 38.1 33 116 70 2 58 20 3 5 7 2 56 11 3 7 16 -0.29 -117 0 0 2 45 34 19 51 40.0 34 116 70 2 42 11 2 48 57 2 40 2 2 51 7 -0.29 -116 0 0 2 29 42 19 51 42.0 35 116 70 2 26 19 2 33 5 2 24 10 2 35 14 -0.29 -115 0 0 2 14 8 19 51 44.0 36 117 70 2 10 45 2 17 31 2 8 36 2 19 40 -0.29 -114 0 0 1 58 52 19 51 46.1 37 117 70 1 55 29 2 2 14 1 53 20 2 4 23 -0.29 -113 0 0 1 43 54 19 51 48.2 38 117 69 1 40 31 1 47 16 1 38 23 1 49 25 -0.29 -112 0 0 1 29 14 19 51 50.4 39 117 69 1 25 52 1 32 36 1 23 44 1 34 45 -0.29 -111 0 0 1 14 54 19 51 52.6 40 117 69 1 11 32 1 18 16 1 9 24 1 20 24 -0.29 -110 0 0 1 0 52 19 51 54.9 41 118 69 0 57 30 1 4 14 0 55 23 1 6 22 -0.29 -109 0 0 0 47 10 19 51 57.2 42 118 68 0 43 48 0 50 31 0 41 41 0 52 39 -0.29 -108 0 0 0 33 47 19 51 59.6 43 118 68 0 30 26 0 37 8 0 28 18 0 39 16 -0.29 -107 0 0 0 20 44 19 52 2.0 44 118 67 0 17 23 0 24 5 0 15 16 0 26 13 -0.29 -106 0 0 0 8 1 19 52 4.4 45 119 67 0 4 40 0 11 22 0 2 33 0 13 30 -0.29 -105 0 0 - 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31 0 0 1 48 39 19 55 53.5 50 236 -2 1 45 17 1 52 2 1 43 8 1 54 10 -0.30 - 30 0 0 2 3 45 19 55 56.2 49 236 -3 2 0 22 2 7 8 1 58 14 2 9 17 -0.30 - 29 0 0 2 19 9 19 55 58.8 48 236 -5 2 15 46 2 22 33 2 13 38 2 24 41 -0.30 - 28 0 0 2 34 52 19 56 1.4 47 237 -6 2 31 28 2 38 15 2 29 20 2 40 24 -0.30 - 27 0 0 2 50 52 19 56 4.0 46 237 -7 2 47 28 2 54 15 2 45 19 2 56 25 -0.30 - 26 0 0 3 7 9 19 56 6.5 45 238 -8 3 3 46 3 10 33 3 1 36 3 12 42 -0.30 - 25 0 0 3 23 44 19 56 9.0 44 238 -9 3 20 20 3 27 8 3 18 11 3 29 17 -0.30 - 24 0 0 3 40 35 19 56 11.4 43 238 -10 3 37 11 3 44 0 3 35 2 3 46 9 -0.30 - 23 0 0 3 57 43 19 56 13.8 42 239 -11 3 54 19 4 1 8 3 52 9 4 3 18 -0.30 - 22 0 0 4 15 8 19 56 16.2 41 239 -12 4 11 43 4 18 32 4 9 33 4 20 42 -0.30 - 21 0 0 4 32 47 19 56 18.5 40 239 -13 4 29 22 4 36 12 4 27 13 4 38 23 -0.30 - 20 0 0 4 50 43 19 56 20.8 39 240 -14 4 47 18 4 54 8 4 45 7 4 56 18 -0.30 - 19 0 0 5 8 53 19 56 23.0 38 240 -15 5 5 28 5 12 19 5 3 18 5 14 29 -0.30 - 18 0 0 5 27 18 19 56 25.1 37 240 -16 5 23 53 5 30 44 5 21 42 5 32 55 -0.30 - 17 0 0 5 45 58 19 56 27.2 36 240 -17 5 42 32 5 49 24 5 40 21 5 51 35 -0.30 - 16 0 0 6 4 51 19 56 29.3 35 241 -18 6 1 25 6 8 17 5 59 14 6 10 28 -0.30 - 15 0 0 6 23 58 19 56 31.3 34 241 -19 6 20 32 6 27 24 6 18 21 6 29 35 -0.30 - 14 0 0 6 43 18 19 56 33.2 33 241 -20 6 39 51 6 46 45 6 37 40 6 48 56 -0.30 - 13 0 0 7 2 50 19 56 35.1 32 241 -21 6 59 24 7 6 17 6 57 13 7 8 29 -0.30 - 12 0 0 7 22 35 19 56 37.0 31 242 -22 7 19 8 7 26 2 7 16 57 7 28 14 -0.30 - 11 0 0 7 42 32 19 56 38.8 30 242 -23 7 39 5 7 45 59 7 36 53 7 48 11 -0.30 - 10 0 0 8 2 40 19 56 40.5 29 242 -24 7 59 12 8 6 7 7 57 1 8 8 19 -0.29 - 9 0 0 8 22 59 19 56 42.2 27 242 -25 8 19 31 8 26 26 8 17 19 8 28 38 -0.29 - 8 0 0 8 43 28 19 56 43.8 26 243 -27 8 40 0 8 46 56 8 37 48 8 49 7 -0.29 - 7 0 0 9 4 7 19 56 45.4 25 243 -28 9 0 39 9 7 35 8 58 27 9 9 47 -0.29 - 6 0 0 9 24 55 19 56 46.9 24 243 -29 9 21 27 9 28 24 9 19 15 9 30 36 -0.29 - 5 0 0 9 45 53 19 56 48.3 23 243 -30 9 42 24 9 49 21 9 40 12 9 51 34 -0.29 - 4 0 0 10 6 59 19 56 49.7 22 244 -31 10 3 30 10 10 27 10 1 18 10 12 40 -0.29 - 3 0 0 10 28 13 19 56 51.0 21 244 -32 10 24 44 10 31 42 10 22 32 10 33 54 -0.29 - 2 0 0 10 49 34 19 56 52.3 20 244 -33 10 46 5 10 53 3 10 43 53 10 55 16 -0.29 - 1 0 0 11 11 2 19 56 53.5 19 244 -34 11 7 33 11 14 32 11 5 21 11 16 44 -0.29 0 0 0 11 32 37 19 56 54.6 18 244 -35 11 29 8 11 36 6 11 26 55 11 38 19 -0.29 1 0 0 11 54 18 19 56 55.7 17 245 -36 11 50 48 11 57 47 11 48 36 12 0 0 -0.29 2 0 0 12 16 4 19 56 56.7 16 245 -37 12 12 34 12 19 33 12 10 22 12 21 46 -0.29 3 0 0 12 37 55 19 56 57.6 15 245 -38 12 34 25 12 41 24 12 32 12 12 43 37 -0.29 4 0 0 12 59 50 19 56 58.5 14 245 -39 12 56 20 13 3 20 12 54 7 13 5 33 -0.29 5 0 0 13 21 49 19 56 59.3 13 246 -40 13 18 19 13 25 19 13 16 6 13 27 32 -0.29 6 0 0 13 43 51 19 57 0.1 12 246 -41 13 40 21 13 47 21 13 38 8 13 49 34 -0.29 7 0 0 14 5 56 19 57 0.8 11 246 -42 14 2 26 14 9 26 14 0 13 14 11 39 -0.29 8 0 0 14 28 3 19 57 1.4 10 246 -43 14 24 33 14 31 33 14 22 20 14 33 47 -0.29 9 0 0 14 50 12 19 57 2.0 9 247 -44 14 46 42 14 53 42 14 44 29 14 55 55 -0.30 10 0 0 15 12 22 19 57 2.5 8 247 -45 15 8 52 15 15 52 15 6 38 15 18 5 -0.30 11 0 0 15 34 32 19 57 2.9 7 247 -46 15 31 2 15 38 3 15 28 49 15 40 16 -0.30 12 0 0 15 56 43 19 57 3.3 6 247 -47 15 53 13 16 0 13 15 50 59 16 2 27 -0.30 13 0 0 16 18 53 19 57 3.6 5 248 -48 16 15 23 16 22 23 16 13 9 16 24 37 -0.30 14 0 0 16 41 2 19 57 3.8 4 248 -49 16 37 32 16 44 33 16 35 19 16 46 46 -0.30 15 0 0 17 3 10 19 57 4.0 3 248 -50 16 59 39 17 6 40 16 57 26 17 8 54 -0.30 16 0 0 17 25 15 19 57 4.2 2 249 -51 17 21 45 17 28 46 17 19 32 17 30 59 -0.30 17 0 0 17 47 18 19 57 4.2 1 249 -52 17 43 48 17 50 49 17 41 35 17 53 2 -0.32 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 351-156209 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 46 28.2336 DE: -19 55 21.194 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 46 28.2335 DE: -19 55 21.194 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.3 * B mag [mag]: 10.9 * Diameter [mas]: 0.10 * 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]: 3.36130 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", 86.416° remarks: * orbital elements for (9352)1991 UB4 : Mean anomaly = 132.5498218435 deg Arg. of pericenter = 325.5710070939 deg Long. of node = 189.2617694337 deg Inclination = 3.7468510731 deg Eccentricity = 0.1275333731 Semimajor axis = 2.6500308255 AU Perihelion dist = 2.3120634554 AU Mag: H = 13.30, G = 0.15 Epoch of elements : MJD 60622.82923125 TDT (2024 Nov 08.8292) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#462023Apr25,0.34,2024,11,8,19.901554,-0.012685,0.285062,19.299716,0.828547,0.004742,0.000582,-0.000001,0.000000 -65.0336,-19.8968,-122.57,-16.89,False UCAC4 351-156209,18.77450937,-19.9225538,10.94,10.32,9.99,0.1,0,,18.79873063,-19.8968010,8.79,8.67,0,0,0 9352,1991 UB4,19.11,11.583,3.3613,0,0,3.580,2.17,,1.0,0 0,132.3604,2024,11,8,325.5710,189.2618,3.7469,0.12753,2.65003,2.31206,13.29,5.0,0.15 1.317,0.0083,0.0015,86,0.0015,Known errors,0.88,0,-1,-1 20241108_156209,60140.69 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org