IOTA/IOTA-ES occultation update for (753) Tiflis / UCAC4 460-002466 event on 2024 Oct 24, 15:27 UT Visible from Summary ------- On 2024 Oct 24 UT, the 23.738 km diameter asteroid (753) Tiflis will occult a 11.9 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.87 mag to 13.53 mag (the magnitude of the asteroid) for at most 1.860 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: 94 * date and approx. time of event: 2024 Oct 24, 15:19 - 2024 Oct 24, 15:36 * geocentric midpoint of event [JD]: 2460608.14429583 * magnitude of target star: 11.87 * magnitude drop [mag]: 1.87 * estimated maximum duration [s]: 1.860 * Moon: 47 % sunlit, 98° distance * Sun: 170° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.024", 0.002", 60°) * approx speed of asteroid's shadow [km/s]: 12.7402 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 460-002466 by 753 Tiflis on 2024 Oct 24 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 32 0 0 -17 50 4 15 35 57.7 0 88 4 -17 43 30 -17 56 38 -17 37 25 -18 2 43 .... 33 0 0 -17 47 51 15 35 57.6 1 87 3 -17 41 17 -17 54 25 -17 35 12 -18 0 30 0.12 34 0 0 -17 45 31 15 35 57.3 2 87 2 -17 38 57 -17 52 6 -17 32 52 -17 58 11 0.16 35 0 0 -17 43 5 15 35 56.9 3 87 1 -17 36 31 -17 49 40 -17 30 26 -17 55 45 0.17 36 0 0 -17 40 32 15 35 56.3 4 87 0 -17 33 58 -17 47 7 -17 27 53 -17 53 12 0.18 37 0 0 -17 37 53 15 35 55.6 5 86 -1 -17 31 18 -17 44 27 -17 25 14 -17 50 33 0.18 38 0 0 -17 35 7 15 35 54.8 6 86 -2 -17 28 33 -17 41 42 -17 22 28 -17 47 47 0.18 39 0 0 -17 32 15 15 35 53.8 7 86 -3 -17 25 40 -17 38 50 -17 19 36 -17 44 55 0.19 40 0 0 -17 29 16 15 35 52.7 8 85 -4 -17 22 42 -17 35 51 -17 16 37 -17 41 56 0.19 41 0 0 -17 26 12 15 35 51.4 9 85 -5 -17 19 37 -17 32 46 -17 13 32 -17 38 52 0.19 42 0 0 -17 23 0 15 35 50.0 10 85 -6 -17 16 26 -17 29 35 -17 10 21 -17 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12 40 0.24 -147 0 0 - 5 1 50 15 19 36.7 2 272 -2 - 4 55 16 - 5 8 25 - 4 49 11 - 5 14 30 0.25 -146 0 0 - 5 3 47 15 19 36.5 1 272 -1 - 4 57 13 - 5 10 22 - 4 51 8 - 5 16 27 0.32 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 460-002466 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 01 52 12.5312 DE: +01 52 22.340 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 01 52 12.5312 DE: +01 52 22.340 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (753) Tiflis asteroid class: Barbarian approx. diameter [km]: 24 approx. diameter ["]: 0.021 distance from Earth [AU]: 1.54170 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.024", 0.002", 60.103° remarks: * orbital elements for (753)Tiflis : Mean anomaly = 100.9228266300 deg Arg. of pericenter = 202.9487079817 deg Long. of node = 61.3178401041 deg Inclination = 10.0866704408 deg Eccentricity = 0.2206796014 Semimajor axis = 2.3292161737 AU Perihelion dist = 1.8152056768 AU Mag: H = 10.21, G = 0.15 Epoch of elements : MJD 60607.64429471 TDT (2024 Oct 24.6443) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,1.86,2024,10,24,15.463100,0.021848,-0.196522,-7.146871,-0.794645,0.000086,0.000987,0.000001,0.000001 122.9062,1.9975,-55.92,-12.07,False UCAC4 460-002466,1.87014757,1.8728722,12.44,11.87,11.56,0.0,0,,1.89179907,1.9975178,1.87,1.76,0,0,0 753,Tiflis,13.53,23.738,1.5417,0,0,-2.719,-4.53,,1.6,0 0,100.7442,2024,10,24,202.9487,61.3178,10.0867,0.22068,2.32922,1.81521,10.21,5.0,0.15 1.462,0.0243,0.0016,60,0.0098,Known errors,0.97,0,-1,-1 20241024_002466,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org