IOTA/IOTA-ES occultation update for (2104) Toronto / UCAC4 382-099051 event on 2024 Oct 23, 12:25 UT Visible from Summary ------- On 2024 Oct 23 UT, the 34.7648299331368 km diameter asteroid (2104) Toronto will occult a 11.0 mag star in the constellation Serpens for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.16 mag to 16.12 mag (the magnitude of the asteroid) for at most 1.160 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: 96 * date and approx. time of event: 2024 Oct 23, 12:21 - 2024 Oct 23, 12:29 * geocentric midpoint of event [JD]: 2460607.01772234 * magnitude of target star: 10.97 * magnitude drop [mag]: 5.16 * estimated maximum duration [s]: 1.160 * Moon: 59 % sunlit, 157° distance * Sun: 62° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 70°) * approx speed of asteroid's shadow [km/s]: 30.1302 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 382-099051 by 2104 Toronto on 2024 Oct 23 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 - 37 0 0 - 5 52 54 12 22 0.2 0 104 62 - 6 2 43 - 5 43 6 - 6 10 59 - 5 34 51 .... - 36 0 0 - 6 7 34 12 22 0.2 1 104 63 - 6 17 23 - 5 57 46 - 6 25 38 - 5 49 30 0.11 - 35 0 0 - 6 22 11 12 22 0.3 2 103 64 - 6 32 0 - 6 12 23 - 6 40 15 - 6 4 8 0.10 - 34 0 0 - 6 36 46 12 22 0.5 3 103 65 - 6 46 34 - 6 26 57 - 6 54 49 - 6 18 42 0.09 - 33 0 0 - 6 51 17 12 22 0.8 4 103 66 - 7 1 6 - 6 41 29 - 7 9 21 - 6 33 14 0.09 - 32 0 0 - 7 5 46 12 22 1.1 5 103 67 - 7 15 34 - 6 55 58 - 7 23 49 - 6 47 43 0.08 - 31 0 0 - 7 20 11 12 22 1.5 6 103 68 - 7 29 59 - 7 10 23 - 7 38 14 - 7 2 8 0.08 - 30 0 0 - 7 34 32 12 22 2.0 7 103 69 - 7 44 20 - 7 24 44 - 7 52 34 - 7 16 29 0.08 - 29 0 0 - 7 48 49 12 22 2.5 8 103 70 - 7 58 36 - 7 39 1 - 8 6 51 - 7 30 46 0.08 - 28 0 0 - 8 3 1 12 22 3.1 9 103 71 - 8 12 49 - 7 53 14 - 8 21 3 - 7 44 59 0.08 - 27 0 0 - 8 17 9 12 22 3.7 11 102 72 - 8 26 56 - 8 7 22 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-51 - 4 47 53 - 4 28 15 - 4 56 9 - 4 20 0 0.09 134 0 0 - 4 23 13 12 28 59.7 9 257 -52 - 4 33 2 - 4 13 24 - 4 41 18 - 4 5 9 0.09 135 0 0 - 4 8 22 12 29 0.3 8 257 -53 - 4 18 11 - 3 58 33 - 4 26 27 - 3 50 17 0.09 136 0 0 - 3 53 31 12 29 0.8 7 257 -54 - 4 3 20 - 3 43 42 - 4 11 35 - 3 35 26 0.09 137 0 0 - 3 38 40 12 29 1.3 6 257 -55 - 3 48 29 - 3 28 51 - 3 56 45 - 3 20 36 0.10 138 0 0 - 3 23 50 12 29 1.6 5 257 -56 - 3 33 39 - 3 14 1 - 3 41 54 - 3 5 46 0.10 139 0 0 - 3 9 1 12 29 1.9 4 257 -57 - 3 18 50 - 2 59 12 - 3 27 5 - 2 50 57 0.11 140 0 0 - 2 54 13 12 29 2.2 3 256 -58 - 3 4 2 - 2 44 24 - 3 12 17 - 2 36 9 0.12 141 0 0 - 2 39 27 12 29 2.3 2 256 -59 - 2 49 16 - 2 29 38 - 2 57 31 - 2 21 23 0.14 142 0 0 - 2 24 43 12 29 2.4 1 256 -60 - 2 34 31 - 2 14 54 - 2 42 47 - 2 6 39 0.22 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 382-099051 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 06 43.2357 DE: -13 39 55.436 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 06 43.2356 DE: -13 39 55.436 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.0 * B mag [mag]: 11.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2104) Toronto asteroid class: approx. diameter [km]: 35 approx. diameter ["]: 0.013 distance from Earth [AU]: 3.60100 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): 0.017", 0.002", 69.637° remarks: * orbital elements for (2104)Toronto : Mean anomaly = 92.6920646893 deg Arg. of pericenter = 290.0821932681 deg Long. of node = 252.4341161677 deg Inclination = 18.3933340232 deg Eccentricity = 0.1221155582 Semimajor axis = 3.1875108196 AU Perihelion dist = 2.7982661567 AU Mag: H = 9.93, G = 0.15 Epoch of elements : MJD 60606.51772208 TDT (2024 Oct 23.5177) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,1.16,2024,10,23,12.425336,0.001876,-0.071344,16.997494,0.548355,0.005196,0.000546,-0.000001,0.000000 53.2341,-13.6627,-10.32,-11.68,False UCAC4 382-099051,18.11200994,-13.6653989,11.85,10.97,10.49,0.1,0,,18.13519929,-13.6626994,5.16,5.18,0,0,0 2104,Toronto,16.12,35.026,3.6010,0,0,2.848,1.34,,2.2,0 0,92.6024,2024,10,23,290.0822,252.4341,18.3933,0.12212,3.18751,2.79827,9.92,5.0,0.15 1.421,0.0170,0.0017,70,0.0056,Known errors,0.83,0,-1,-1 20241023_099051,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org