IOTA/IOTA-ES occultation update for (9352) 1991 UB4 / UCAC4 351-126042 event on 2024 Oct 12, 09:03 UT Visible from Summary ------- On 2024 Oct 12 UT, the 11.3754477276971 km diameter asteroid (9352) 1991 UB4 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 8.07 mag to 18.95 mag (the magnitude of the asteroid) for at most 0.460 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 12, 09:00 - 2024 Oct 12, 09:07 * geocentric midpoint of event [JD]: 2460595.87761075 * magnitude of target star: 10.88 * magnitude drop [mag]: 8.07 * estimated maximum duration [s]: 0.460 * Moon: 67 % sunlit, 38° distance * Sun: 73° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.30 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.001", 89°) * approx speed of asteroid's shadow [km/s]: 25.4715 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 351-126042 by 9352 1991 UB4 on 2024 Oct 12 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 13 0 0 -33 28 25 9 0 28.7 0 114 53 -33 32 48 -33 24 1 -33 35 26 -33 21 24 .... 14 0 0 -33 50 58 9 0 28.8 1 113 54 -33 55 22 -33 46 35 -33 58 0 -33 43 57 0.64 15 0 0 -34 13 36 9 0 29.0 2 113 54 -34 18 1 -34 9 12 -34 20 39 -34 6 35 0.71 16 0 0 -34 36 18 9 0 29.2 3 112 54 -34 40 43 -34 31 54 -34 43 21 -34 29 16 0.73 17 0 0 -34 59 4 9 0 29.5 4 112 55 -35 3 29 -34 54 39 -35 6 7 -34 52 1 0.75 18 0 0 -35 21 52 9 0 29.9 5 111 55 -35 26 17 -35 17 27 -35 28 56 -35 14 49 0.76 19 0 0 -35 44 42 9 0 30.4 6 110 55 -35 49 8 -35 40 17 -35 51 47 -35 37 39 0.76 20 0 0 -36 7 34 9 0 30.9 7 110 55 -36 12 0 -36 3 9 -36 14 39 -36 0 30 0.77 21 0 0 -36 30 27 9 0 31.5 8 109 56 -36 34 53 -36 26 1 -36 37 32 -36 23 22 0.77 22 0 0 -36 53 20 9 0 32.2 8 109 56 -36 57 46 -36 48 54 -37 0 25 -36 46 15 0.77 23 0 0 -37 16 12 9 0 33.0 9 108 56 -37 20 39 -37 11 46 -37 23 18 -37 9 7 0.77 24 0 0 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 351-126042 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 10 08.0086 DE: -19 54 44.105 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 10 08.0085 DE: -19 54 44.105 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.9 * B mag [mag]: 11.8 * 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]: 2.99960 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): 0.009", 0.001", 89.157° remarks: * orbital elements for (9352)1991 UB4 : Mean anomaly = 126.2715347968 deg Arg. of pericenter = 325.5776400953 deg Long. of node = 189.2623874893 deg Inclination = 3.7468401213 deg Eccentricity = 0.1275087157 Semimajor axis = 2.6500997360 AU Perihelion dist = 2.3121889223 AU Mag: H = 13.30, G = 0.15 Epoch of elements : MJD 60595.37761054 TDT (2024 Oct 12.3776) ------ occelmnt file for Occult BEGIN ----------------------------------- <Occultations> <Event> <Elements>JPL#462023Apr25,0.46,2024,10,12,9.062658,-0.027144,-0.615549,14.363170,-0.626691,0.005525,0.000218,0.000000,0.000000</Elements> <Earth>115.5247,-19.9081,40.66,-7.64,False</Earth> <Star>UCAC4 351-126042,18.16889131,-19.9122512,11.75,10.88,10.41,0.1,0,,18.19321506,-19.9080580,8.07,8.09,0,0,0</Star> <Object>9352,1991 UB4,18.95,11.593,2.9996,0,0,2.986,-1.84,,1.0,0</Object> <Orbit>0,126.1853,2024,10,12,325.5776,189.2624,3.7468,0.12751,2.65010,2.31219,13.29,5.0,0.15</Orbit> <Errors>1.299,0.0093,0.0015,89,0.0016,Known errors,0.88,0,-1,-1</Errors> <ID>20241012_126042,60140.63</ID> </Event> </Occultations> ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org