IOTA/IOTA-ES occultation update for (2104) Toronto / UCAC4 327-114810 event on 2024 Mar 12, 01:37 UT Visible from Summary ------- On 2024 Mar 12 UT, the 34.901 km diameter asteroid (2104) Toronto will occult a 11.8 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 3.88 mag to 15.61 mag (the magnitude of the asteroid) for at most 1.790 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 Mar 12, 01:31 - 2024 Mar 12, 01:42 * geocentric midpoint of event [JD]: 2460381.56738042 * magnitude of target star: 11.76 * magnitude drop [mag]: 3.88 * estimated maximum duration [s]: 1.790 * Moon: 4 % sunlit, 108° distance * Sun: 84° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.002", 70°) * approx speed of asteroid's shadow [km/s]: 19.5500 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 327-114810 by 2104 Toronto on 2024 Mar 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 - 22 0 0 -16 34 19 1 31 36.3 1 116 -70 -16 44 50 -16 23 47 -16 48 26 -16 20 12 .... - 21 0 0 -17 1 58 1 31 36.4 2 115 -70 -17 12 28 -16 51 27 -17 16 3 -16 47 52 0.14 - 20 0 0 -17 29 17 1 31 36.6 3 115 -69 -17 39 47 -17 18 48 -17 43 21 -17 15 13 0.11 - 19 0 0 -17 56 16 1 31 37.0 4 115 -69 -18 6 44 -17 45 48 -18 10 18 -17 42 14 0.10 - 18 0 0 -18 22 54 1 31 37.5 5 114 -68 -18 33 21 -18 12 27 -18 36 55 -18 8 54 0.10 - 17 0 0 -18 49 11 1 31 38.0 6 114 -68 -18 59 37 -18 38 45 -19 3 10 -18 35 12 0.09 - 16 0 0 -19 15 6 1 31 38.7 7 114 -67 -19 25 31 -19 4 42 -19 29 4 -19 1 9 0.09 - 15 0 0 -19 40 39 1 31 39.5 8 113 -67 -19 51 3 -19 30 16 -19 54 35 -19 26 44 0.09 - 14 0 0 -20 5 50 1 31 40.4 9 113 -66 -20 16 12 -19 55 28 -20 19 44 -19 51 56 0.09 - 13 0 0 -20 30 37 1 31 41.4 10 113 -65 -20 40 58 -20 20 17 -20 44 29 -20 16 45 0.08 - 12 0 0 -20 55 1 1 31 42.4 11 112 -65 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: UCAC4 327-114810 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 50 55.2745 DE: -24 42 16.625 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 50 55.2746 DE: -24 42 16.625 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.8 * B mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2104) Toronto asteroid class: approx. diameter [km]: 35 approx. diameter ["]: 0.016 distance from Earth [AU]: 2.93240 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.021", 0.002", 69.5° remarks: * orbital elements for (2104)Toronto : Mean anomaly = 53.5817802054 deg Arg. of pericenter = 290.1643820767 deg Long. of node = 252.4336715391 deg Inclination = 18.3925672781 deg Eccentricity = 0.1220232734 Semimajor axis = 3.1879724333 AU Perihelion dist = 2.7989656014 AU Mag: H = 9.93, G = 0.15 Epoch of elements : MJD 60381.06738042 TDT (2024 Mar 12.0674) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,1.79,2024,3,12,1.617130,0.015840,-0.063322,10.702097,2.688169,-0.005879,0.000064,0.000000,0.000000 73.6442,-24.7120,158.17,-3.18,False UCAC4 327-114810,17.84868734,-24.7046180,12.50,11.76,11.36,0.0,0,,17.87333352,-24.7119659,3.88,3.83,0,0,0 2104,Toronto,15.61,34.901,2.9324,0,0,2.355,8.06,,2.2,0 0,53.3970,2024,3,11,290.1644,252.4337,18.3926,0.12202,3.18797,2.79897,9.92,5.0,0.15 1.170,0.0210,0.0016,70,0.0028,Known errors,1.39,0,-1,-1 20240312_114810,60139.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org