IOTA/IOTA-ES occultation update for (504) Cora / UCAC4 493-006919 event on 2024 Dec 09, 23:04 UT Visible from Summary ------- On 2024 Dec 09 UT, the 30.23 km diameter asteroid (504) Cora will occult a 11.7 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.96 mag to 13.45 mag (the magnitude of the asteroid) for at most 2.770 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: 93 * date and approx. time of event: 2024 Dec 09, 22:55 - 2024 Dec 09, 23:14 * geocentric midpoint of event [JD]: 2460654.46158367 * magnitude of target star: 11.69 * magnitude drop [mag]: 1.96 * estimated maximum duration [s]: 2.770 * Moon: 64 % sunlit, 59° distance * Sun: 161° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 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]: 10.8999 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 493-006919 by 504 Cora on 2024 Dec 9 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 - 94 0 0 1 28 30 23 14 2.2 0 81 12 1 37 10 1 19 51 1 45 16 1 11 43 .... - 93 0 0 1 37 22 23 14 2.1 1 81 11 1 46 1 1 28 43 1 54 7 1 20 36 0.15 - 92 0 0 1 45 52 23 14 1.7 2 81 10 1 54 31 1 37 13 2 2 36 1 29 7 0.21 - 91 0 0 1 54 1 23 14 1.2 3 81 9 2 2 39 1 45 23 2 10 44 1 37 17 0.24 - 90 0 0 2 1 48 23 14 0.5 4 82 8 2 10 26 1 53 10 2 18 30 1 45 5 0.25 - 89 0 0 2 9 14 23 13 59.5 5 82 7 2 17 51 2 0 36 2 25 55 1 52 31 0.26 - 88 0 0 2 16 18 23 13 58.5 6 82 6 2 24 55 2 7 41 2 32 58 1 59 36 0.27 - 87 0 0 2 23 1 23 13 57.2 7 82 5 2 31 37 2 14 24 2 39 40 2 6 19 0.27 - 86 0 0 2 29 21 23 13 55.7 8 82 4 2 37 57 2 20 45 2 46 0 2 12 41 0.28 - 85 0 0 2 35 21 23 13 54.1 9 82 3 2 43 56 2 26 44 2 51 59 2 18 41 0.28 - 84 0 0 2 40 58 23 13 52.3 10 82 2 2 49 33 2 32 22 2 57 36 2 24 19 0.28 - 83 0 0 2 46 14 23 13 50.3 11 82 1 2 54 49 2 37 38 3 2 51 2 29 35 0.28 - 82 0 0 2 51 8 23 13 48.1 12 82 0 2 59 43 2 42 33 3 7 45 2 34 30 0.28 - 81 0 0 2 55 40 23 13 45.8 13 82 0 3 4 15 2 47 6 3 12 17 2 39 3 0.28 - 80 0 0 2 59 51 23 13 43.3 14 82 -1 3 8 25 2 51 17 3 16 27 2 43 14 0.29 - 79 0 0 3 3 40 23 13 40.6 15 82 -2 3 12 14 2 55 6 3 20 15 2 47 4 0.29 - 78 0 0 3 7 8 23 13 37.7 16 82 -3 3 15 41 2 58 33 3 23 42 2 50 31 0.29 - 77 0 0 3 10 13 23 13 34.7 17 82 -4 3 18 47 3 1 39 3 26 48 2 53 38 0.29 - 76 0 0 3 12 57 23 13 31.5 18 82 -5 3 21 31 3 4 24 3 29 31 2 56 22 0.29 - 75 0 0 3 15 20 23 13 28.1 19 82 -6 3 23 53 3 6 46 3 31 53 2 58 44 0.29 - 74 0 0 3 17 20 23 13 24.6 20 82 -7 3 25 53 3 8 47 3 33 54 3 0 45 0.29 - 73 0 0 3 18 59 23 13 20.9 21 82 -8 3 27 32 3 10 26 3 35 33 3 2 25 0.29 - 72 0 0 3 20 17 23 13 17.0 22 82 -9 3 28 50 3 11 44 3 36 50 3 3 42 0.29 - 71 0 0 3 21 13 23 13 13.0 23 82 -10 3 29 46 3 12 40 3 37 46 3 4 39 0.29 - 70 0 0 3 21 47 23 13 8.8 24 82 -11 3 30 20 3 13 14 3 38 20 3 5 13 0.29 - 69 0 0 3 22 0 23 13 4.4 25 82 -12 3 30 33 3 13 27 3 38 33 3 5 26 0.29 - 68 0 0 3 21 52 23 12 59.9 26 82 -12 3 30 25 3 13 19 3 38 25 3 5 18 0.29 - 67 0 0 3 21 22 23 12 55.3 27 82 -13 3 29 55 3 12 49 3 37 55 3 4 48 0.29 - 66 0 0 3 20 31 23 12 50.5 28 82 -14 3 29 4 3 11 58 3 37 4 3 3 57 0.29 - 65 0 0 3 19 19 23 12 45.5 29 82 -15 3 27 52 3 10 46 3 35 52 3 2 45 0.29 - 64 0 0 3 17 45 23 12 40.4 30 82 -16 3 26 18 3 9 12 3 34 18 3 1 11 0.29 - 63 0 0 3 15 51 23 12 35.1 31 82 -17 3 24 24 3 7 17 3 32 24 2 59 16 0.29 - 62 0 0 3 13 35 23 12 29.7 32 82 -18 3 22 8 3 5 2 3 30 8 2 57 0 0.29 - 61 0 0 3 10 58 23 12 24.2 33 82 -19 3 19 31 3 2 25 3 27 31 2 54 23 0.29 - 60 0 0 3 8 0 23 12 18.5 34 82 -20 3 16 33 2 59 27 3 24 34 2 51 25 0.29 - 59 0 0 3 4 41 23 12 12.6 35 82 -20 3 13 15 2 56 8 3 21 15 2 48 6 0.29 - 58 0 0 3 1 2 23 12 6.6 36 82 -21 3 9 35 2 52 28 3 17 36 2 44 26 0.29 - 57 0 0 2 57 1 23 12 0.5 37 81 -22 3 5 35 2 48 27 3 13 36 2 40 25 0.29 - 56 0 0 2 52 40 23 11 54.3 38 81 -23 3 1 14 2 44 6 3 9 15 2 36 4 0.29 - 55 0 0 2 47 58 23 11 47.9 39 81 -24 2 56 32 2 39 24 3 4 34 2 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13 288 -14 -31 3 41 -31 21 21 -30 55 25 -31 29 38 0.31 71 0 0 -31 25 39 22 55 33.0 12 288 -13 -31 16 50 -31 34 29 -31 8 35 -31 42 45 0.31 72 0 0 -31 38 32 22 55 31.1 11 287 -12 -31 29 43 -31 47 21 -31 21 28 -31 55 37 0.31 73 0 0 -31 51 8 22 55 29.4 10 287 -12 -31 42 20 -31 59 57 -31 34 6 -32 8 12 0.31 74 0 0 -32 3 29 22 55 27.9 9 286 -11 -31 54 41 -32 12 16 -31 46 27 -32 20 31 0.31 75 0 0 -32 15 32 22 55 26.5 8 286 -10 -32 6 46 -32 24 20 -31 58 32 -32 32 34 0.31 76 0 0 -32 27 20 22 55 25.2 7 285 -9 -32 18 33 -32 36 6 -32 10 21 -32 44 20 0.31 77 0 0 -32 38 51 22 55 24.1 7 285 -8 -32 30 5 -32 47 37 -32 21 53 -32 55 50 0.31 78 0 0 -32 50 5 22 55 23.2 6 284 -8 -32 41 20 -32 58 50 -32 33 8 -33 7 3 0.31 79 0 0 -33 1 2 22 55 22.3 5 284 -7 -32 52 17 -33 9 47 -32 44 7 -33 17 59 0.31 80 0 0 -33 11 42 22 55 21.6 4 283 -6 -33 2 58 -33 20 27 -32 54 48 -33 28 38 0.32 81 0 0 -33 22 6 22 55 21.0 3 282 -5 -33 13 23 -33 30 50 -33 5 13 -33 39 0 0.32 82 0 0 -33 32 12 22 55 20.6 2 282 -4 -33 23 29 -33 40 55 -33 15 20 -33 49 6 0.33 83 0 0 -33 42 1 22 55 20.3 1 281 -4 -33 33 19 -33 50 44 -33 25 11 -33 58 54 0.34 84 0 0 -33 51 33 22 55 20.2 1 281 -3 -33 42 52 -34 0 15 -33 34 44 -34 8 25 0.39 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 493-006919 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 12 56.3715 DE: +08 33 13.303 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 12 56.3714 DE: +08 33 13.303 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.7 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (504) Cora asteroid class: approx. diameter [km]: 30 approx. diameter ["]: 0.028 distance from Earth [AU]: 1.51020 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 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", 70.098° remarks: * orbital elements for (504)Cora : Mean anomaly = 52.3750499674 deg Arg. of pericenter = 248.6386563596 deg Long. of node = 104.4318280503 deg Inclination = 12.8998437979 deg Eccentricity = 0.2159070683 Semimajor axis = 2.7235278290 AU Perihelion dist = 2.1354989200 AU Mag: H = 10.05, G = 0.15 Epoch of elements : MJD 60653.96158346 TDT (2024 Dec 09.9616) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,2.77,2024,12,9,23.078008,-0.086384,-0.268733,-5.856877,1.883301,0.001308,0.001462,0.000001,0.000000 -1.7690,8.6186,-167.98,-22.93,False UCAC4 493-006919,4.21565874,8.5536954,12.09,11.69,11.47,0.0,0,,4.23854762,8.6186246,1.96,1.76,0,0,0 504,Cora,13.45,30.230,1.5102,0,0,-2.299,10.97,,1.8,0 0,52.1642,2024,12,9,248.6387,104.4318,12.8998,0.21591,2.72353,2.13550,10.05,5.0,0.15 1.468,0.0210,0.0019,70,0.0129,Known errors,1.04,0,-1,-1 20241209_006919,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org