IOTA/IOTA-ES occultation update for (4220) Flood / TYC 1260-01403-1 event on 2024 Aug 06, 19:00 UT Visible from Summary ------- On 2024 Aug 06 UT, the 11.591 km diameter asteroid (4220) Flood will occult a 11.3 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 7.46 mag to 18.71 mag (the magnitude of the asteroid) for at most 0.430 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 Aug 06, 18:56 - 2024 Aug 06, 19:04 * geocentric midpoint of event [JD]: 2460529.29203925 * magnitude of target star: 11.25 * magnitude drop [mag]: 7.46 * estimated maximum duration [s]: 0.430 * Moon: 5 % sunlit, 100° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.29 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 85°) * approx speed of asteroid's shadow [km/s]: 27.1375 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1260-01403-1 by 4220 Flood on 2024 Aug 6 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 99 0 0 -24 56 50 18 56 50.8 1 67 -68 -25 0 27 -24 53 13 -25 2 34 -24 51 7 .... 100 0 0 -24 33 24 18 56 50.9 2 66 -67 -24 37 1 -24 29 47 -24 39 8 -24 27 41 0.16 101 0 0 -24 9 49 18 56 51.1 3 66 -66 -24 13 27 -24 6 12 -24 15 33 -24 4 5 0.23 102 0 0 -23 46 6 18 56 51.3 4 65 -66 -23 49 43 -23 42 28 -23 51 50 -23 40 22 0.26 103 0 0 -23 22 14 18 56 51.6 5 65 -65 -23 25 52 -23 18 37 -23 27 58 -23 16 30 0.28 104 0 0 -22 58 15 18 56 52.0 6 65 -64 -23 1 53 -22 54 37 -23 3 59 -22 52 31 0.29 105 0 0 -22 34 9 18 56 52.5 7 64 -63 -22 37 47 -22 30 31 -22 39 53 -22 28 25 0.30 106 0 0 -22 9 56 18 56 53.0 8 64 -62 -22 13 34 -22 6 19 -22 15 41 -22 4 12 0.31 107 0 0 -21 45 38 18 56 53.7 9 63 -61 -21 49 16 -21 42 0 -21 51 23 -21 39 54 0.31 108 0 0 -21 21 15 18 56 54.4 10 63 -60 -21 24 52 -21 17 37 -21 26 59 -21 15 30 0.32 109 0 0 -20 56 46 18 56 55.2 11 63 -60 -21 0 24 -20 53 9 -21 2 31 -20 51 2 0.32 110 0 0 -20 32 14 18 56 56.0 12 62 -59 -20 35 52 -20 28 36 -20 37 59 -20 26 29 0.32 111 0 0 -20 7 38 18 56 57.0 13 62 -58 -20 11 16 -20 4 1 -20 13 23 -20 1 54 0.32 112 0 0 -19 43 0 18 56 58.0 14 62 -57 -19 46 37 -19 39 22 -19 48 44 -19 37 15 0.33 113 0 0 -19 18 19 18 56 59.1 15 61 -56 -19 21 56 -19 14 41 -19 24 3 -19 12 34 0.33 114 0 0 -18 53 36 18 57 0.3 16 61 -55 -18 57 14 -18 49 59 -18 59 21 -18 47 52 0.33 115 0 0 -18 28 53 18 57 1.6 17 61 -54 -18 32 30 -18 25 15 -18 34 37 -18 23 8 0.33 116 0 0 -18 4 9 18 57 2.9 18 60 -53 -18 7 46 -18 0 31 -18 9 53 -17 58 24 0.33 117 0 0 -17 39 25 18 57 4.4 19 60 -52 -17 43 2 -17 35 48 -17 45 9 -17 33 41 0.33 118 0 0 -17 14 42 18 57 5.9 20 60 -51 -17 18 20 -17 11 5 -17 20 26 -17 8 58 0.33 119 0 0 -16 50 1 18 57 7.5 21 59 -50 -16 53 38 -16 46 24 -16 55 45 -16 44 17 0.33 120 0 0 -16 25 22 18 57 9.2 22 59 -49 -16 28 59 -16 21 45 -16 31 6 -16 19 38 0.33 121 0 0 -16 0 46 18 57 10.9 23 58 -48 -16 4 23 -15 57 9 -16 6 29 -15 55 2 0.34 122 0 0 -15 36 13 18 57 12.7 24 58 -47 -15 39 50 -15 32 36 -15 41 56 -15 30 30 0.34 123 0 0 -15 11 44 18 57 14.7 25 58 -46 -15 15 21 -15 8 8 -15 17 27 -15 6 1 0.34 124 0 0 -14 47 20 18 57 16.7 26 57 -45 -14 50 57 -14 43 44 -14 53 3 -14 41 38 0.34 125 0 0 -14 23 2 18 57 18.7 27 57 -44 -14 26 38 -14 19 26 -14 28 44 -14 17 20 0.34 126 0 0 -13 58 49 18 57 20.9 28 57 -43 -14 2 26 -13 55 13 -14 4 32 -13 53 7 0.34 127 0 0 -13 34 44 18 57 23.1 29 56 -42 -13 38 20 -13 31 8 -13 40 26 -13 29 2 0.34 128 0 0 -13 10 45 18 57 25.4 30 56 -41 -13 14 21 -13 7 9 -13 16 27 -13 5 4 0.34 129 0 0 -12 46 54 18 57 27.8 31 56 -40 -12 50 30 -12 43 19 -12 52 36 -12 41 13 0.34 130 0 0 -12 23 12 18 57 30.2 32 55 -39 -12 26 48 -12 19 37 -12 28 53 -12 17 32 0.34 131 0 0 -11 59 39 18 57 32.7 34 55 -38 -12 3 14 -11 56 4 -12 5 20 -11 53 59 0.34 132 0 0 -11 36 16 18 57 35.3 35 55 -37 -11 39 51 -11 32 41 -11 41 56 -11 30 36 0.34 133 0 0 -11 13 3 18 57 38.0 36 54 -36 -11 16 38 -11 9 28 -11 18 43 -11 7 23 0.34 134 0 0 -10 50 1 18 57 40.7 37 54 -35 -10 53 35 -10 46 26 -10 55 40 -10 44 22 0.34 135 0 0 -10 27 10 18 57 43.5 38 53 -33 -10 30 44 -10 23 36 -10 32 49 -10 21 31 0.34 136 0 0 -10 4 31 18 57 46.3 39 53 -32 -10 8 5 -10 0 58 -10 10 10 - 9 58 53 0.34 137 0 0 - 9 42 5 18 57 49.3 40 53 -31 - 9 45 39 - 9 38 32 - 9 47 44 - 9 36 27 0.34 138 0 0 - 9 19 52 18 57 52.3 41 52 -30 - 9 23 26 - 9 16 19 - 9 25 30 - 9 14 15 0.34 139 0 0 - 8 57 53 18 57 55.3 42 52 -29 - 9 1 26 - 8 54 20 - 9 3 30 - 8 52 16 0.34 140 0 0 - 8 36 8 18 57 58.4 43 51 -28 - 8 39 41 - 8 32 35 - 8 41 45 - 8 30 32 0.35 141 0 0 - 8 14 38 18 58 1.6 44 51 -27 - 8 18 10 - 8 11 5 - 8 20 14 - 8 9 2 0.35 142 0 0 - 7 53 22 18 58 4.8 45 50 -26 - 7 56 55 - 7 49 50 - 7 58 58 - 7 47 47 0.35 143 0 0 - 7 32 23 18 58 8.1 46 50 -25 - 7 35 55 - 7 28 51 - 7 37 58 - 7 26 48 0.35 144 0 0 - 7 11 40 18 58 11.4 47 49 -24 - 7 15 11 - 7 8 8 - 7 17 14 - 7 6 5 0.35 145 0 0 - 6 51 13 18 58 14.8 48 49 -23 - 6 54 44 - 6 47 42 - 6 56 47 - 6 45 39 0.35 146 0 0 - 6 31 3 18 58 18.3 49 48 -22 - 6 34 34 - 6 27 32 - 6 36 37 - 6 25 29 0.35 147 0 0 - 6 11 11 18 58 21.8 50 47 -21 - 6 14 42 - 6 7 40 - 6 16 44 - 6 5 38 0.35 148 0 0 - 5 51 37 18 58 25.3 51 47 -20 - 5 55 7 - 5 48 6 - 5 57 10 - 5 46 4 0.35 149 0 0 - 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99 0 0 -11 5 58 19 4 13.6 1 291 62 -11 9 32 -11 2 24 -11 11 37 -11 0 19 0.40 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 1260-01403-1 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 50 45.7759 DE: +20 41 08.124 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 50 45.7760 DE: +20 41 08.125 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.3 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4220) Flood asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.50470 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#46 date of fit: 2022 Nov 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): 0.016", 0.002", 85.326° remarks: * orbital elements for (4220)Flood : Mean anomaly = 320.1402000451 deg Arg. of pericenter = 232.5738556156 deg Long. of node = 220.9608290004 deg Inclination = 7.0005730635 deg Eccentricity = 0.1953452573 Semimajor axis = 2.8022615902 AU Perihelion dist = 2.2548530789 AU Mag: H = 13.67, G = 0.15 Epoch of elements : MJD 60528.79203992 TDT (2024 Aug 06.7920) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#462022Nov25,0.43,2024,8,6,19.008942,0.043396,-0.331706,15.189309,1.975021,-0.005151,-0.001097,0.000000,0.000000 177.1091,20.7601,-103.67,16.39,False TYC 1260-01403-1,3.84604884,20.6855900,11.88,11.25,10.91,0.0,4,,3.86982372,20.7601179,7.46,7.35,0,0,0 4220,Flood,18.71,11.591,2.5047,0,0,3.803,6.93,,1.0,0 0,319.9738,2024,8,6,232.5739,220.9608,7.0006,0.19535,2.80226,2.25485,13.67,5.0,0.15 1.291,0.0160,0.0017,85,0.0019,Known errors,1.48,0,-1,-1 20240806_1403-1,60140.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org