IOTA/IOTA-ES occultation update for (1420) Radcliffe / TYC 1341-00612-1 event on 2024 Apr 09, 21:20 UT Visible from Summary ------- On 2024 Apr 09 UT, the 22.297 km diameter asteroid (1420) Radcliffe will occult a 11.3 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.44 mag to 17.70 mag (the magnitude of the asteroid) for at most 1.000 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 Apr 09, 21:16 - 2024 Apr 09, 21:24 * geocentric midpoint of event [JD]: 2460410.38908183 * magnitude of target star: 11.26 * magnitude drop [mag]: 6.44 * estimated maximum duration [s]: 1.000 * Moon: 2 % sunlit, 63° distance * Sun: 77° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.001", 99°) * approx speed of asteroid's shadow [km/s]: 22.2211 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1341-00612-1 by 1420 Radcliffe on 2024 Apr 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 -138 0 0 -26 2 41 21 16 11.9 0 66 56 -26 10 23 -25 54 59 -26 12 38 -25 52 44 .... -137 0 0 -25 38 57 21 16 12.0 1 66 56 -25 46 39 -25 31 15 -25 48 54 -25 29 1 0.26 -136 0 0 -25 15 19 21 16 12.2 2 65 57 -25 23 1 -25 7 38 -25 25 15 -25 5 24 0.40 -135 0 0 -24 51 48 21 16 12.5 3 65 57 -24 59 29 -24 44 8 -25 1 44 -24 41 54 0.46 -134 0 0 -24 28 25 21 16 12.8 4 64 57 -24 36 5 -24 20 45 -24 38 20 -24 18 31 0.50 -133 0 0 -24 5 10 21 16 13.3 5 64 58 -24 12 50 -23 57 31 -24 15 4 -23 55 17 0.52 -132 0 0 -23 42 3 21 16 13.9 6 64 58 -23 49 43 -23 34 25 -23 51 56 -23 32 12 0.53 -131 0 0 -23 19 7 21 16 14.6 7 63 58 -23 26 45 -23 11 29 -23 28 59 -23 9 15 0.54 -130 0 0 -22 56 20 21 16 15.4 8 63 58 -23 3 58 -22 48 42 -23 6 11 -22 46 29 0.55 -129 0 0 -22 33 43 21 16 16.3 9 62 58 -22 41 21 -22 26 7 -22 43 34 -22 23 54 0.55 -128 0 0 -22 11 18 21 16 17.3 10 62 58 -22 18 55 -22 3 43 -22 21 8 -22 1 30 0.56 -127 0 0 -21 49 5 21 16 18.4 11 62 58 -21 56 41 -21 41 30 -21 58 54 -21 39 18 0.56 -126 0 0 -21 27 5 21 16 19.6 12 61 58 -21 34 40 -21 19 30 -21 36 52 -21 17 18 0.57 -125 0 0 -21 5 17 21 16 20.9 13 61 58 -21 12 51 -20 57 43 -21 15 4 -20 55 31 0.57 -124 0 0 -20 43 43 21 16 22.3 14 60 58 -20 51 16 -20 36 10 -20 53 29 -20 33 58 0.57 -123 0 0 -20 22 23 21 16 23.8 15 60 58 -20 29 55 -20 14 50 -20 32 7 -20 12 39 0.57 -122 0 0 -20 1 17 21 16 25.4 16 60 58 -20 8 49 -19 53 46 -20 11 1 -19 51 34 0.58 -121 0 0 -19 40 27 21 16 27.1 17 59 57 -19 47 58 -19 32 56 -19 50 10 -19 30 45 0.58 -120 0 0 -19 19 53 21 16 28.9 18 59 57 -19 27 23 -19 12 23 -19 29 35 -19 10 12 0.58 -119 0 0 -18 59 34 21 16 30.7 19 58 57 -19 7 4 -18 52 5 -19 9 15 -18 49 54 0.58 -118 0 0 -18 39 33 21 16 32.7 20 58 56 -18 47 2 -18 32 4 -18 49 13 -18 29 54 0.58 -117 0 0 -18 19 49 21 16 34.8 21 58 56 -18 27 17 -18 12 21 -18 29 28 -18 10 11 0.58 -116 0 0 -18 0 22 21 16 37.0 22 57 56 -18 7 50 -17 52 55 -18 10 0 -17 50 45 0.59 -115 0 0 -17 41 14 21 16 39.3 23 57 55 -17 48 41 -17 33 48 -17 50 51 -17 31 38 0.59 -114 0 0 -17 22 24 21 16 41.7 24 56 55 -17 29 50 -17 14 59 -17 32 0 -17 12 49 0.59 -113 0 0 -17 3 54 21 16 44.2 25 56 54 -17 11 19 -16 56 29 -17 13 29 -16 54 19 0.59 -112 0 0 -16 45 42 21 16 46.7 26 56 54 -16 53 7 -16 38 19 -16 55 17 -16 36 9 0.59 -111 0 0 -16 27 51 21 16 49.4 27 55 53 -16 35 15 -16 20 28 -16 37 25 -16 18 19 0.59 -110 0 0 -16 10 21 21 16 52.1 28 55 53 -16 17 44 -16 2 58 -16 19 53 -16 0 49 0.59 -109 0 0 -15 53 10 21 16 55.0 29 54 52 -16 0 33 -15 45 49 -16 2 42 -15 43 40 0.59 -108 0 0 -15 36 21 21 16 57.9 30 54 51 -15 43 43 -15 29 0 -15 45 52 -15 26 52 0.59 -107 0 0 -15 19 54 21 17 0.9 31 53 51 -15 27 15 -15 12 34 -15 29 23 -15 10 26 0.59 -106 0 0 -15 3 48 21 17 4.0 32 53 50 -15 11 9 -14 56 29 -15 13 17 -14 54 21 0.59 -105 0 0 -14 48 5 21 17 7.1 33 52 49 -14 55 24 -14 40 46 -14 57 32 -14 38 38 0.60 -104 0 0 -14 32 44 21 17 10.4 34 52 49 -14 40 3 -14 25 26 -14 42 11 -14 23 18 0.60 -103 0 0 -14 17 46 21 17 13.7 35 51 48 -14 25 4 -14 10 28 -14 27 12 -14 8 21 0.60 -102 0 0 -14 3 11 21 17 17.1 35 51 47 -14 10 28 -13 55 54 -14 12 36 -13 53 47 0.60 -101 0 0 -13 48 59 21 17 20.6 36 50 46 -13 56 16 -13 41 43 -13 58 23 -13 39 36 0.60 -100 0 0 -13 35 11 21 17 24.2 37 49 46 -13 42 27 -13 27 56 -13 44 34 -13 25 49 0.60 - 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12 0 0 -21 42 47 21 23 47.7 26 308 -39 -21 50 24 -21 35 12 -21 52 37 -21 32 59 0.61 - 11 0 0 -22 5 5 21 23 50.2 25 308 -40 -22 12 42 -21 57 29 -22 14 55 -21 55 16 0.61 - 10 0 0 -22 27 34 21 23 52.6 24 307 -40 -22 35 12 -22 19 58 -22 37 25 -22 17 45 0.61 - 9 0 0 -22 50 16 21 23 54.9 23 307 -41 -22 57 54 -22 42 38 -23 0 7 -22 40 25 0.61 - 8 0 0 -23 13 8 21 23 57.2 22 306 -42 -23 20 47 -23 5 30 -23 23 0 -23 3 16 0.61 - 7 0 0 -23 36 10 21 23 59.3 21 306 -43 -23 43 50 -23 28 31 -23 46 4 -23 26 18 0.61 - 6 0 0 -23 59 23 21 24 1.3 20 305 -44 -24 7 3 -23 51 43 -24 9 17 -23 49 29 0.61 - 5 0 0 -24 22 44 21 24 3.3 19 305 -45 -24 30 25 -24 15 4 -24 32 39 -24 12 50 0.61 - 4 0 0 -24 46 14 21 24 5.1 18 304 -45 -24 53 55 -24 38 33 -24 56 9 -24 36 19 0.61 - 3 0 0 -25 9 51 21 24 6.9 17 304 -46 -25 17 33 -25 2 10 -25 19 48 -24 59 56 0.61 - 2 0 0 -25 33 36 21 24 8.5 16 303 -47 -25 41 18 -25 25 54 -25 43 33 -25 23 40 0.61 - 1 0 0 -25 57 27 21 24 10.1 15 303 -48 -26 5 10 -25 49 45 -26 7 25 -25 47 30 0.61 - 0 0 0 -26 21 24 21 24 11.5 14 303 -48 -26 29 8 -26 13 41 -26 31 23 -26 11 26 0.61 1 0 0 -26 45 26 21 24 12.9 13 302 -49 -26 53 10 -26 37 43 -26 55 26 -26 35 28 0.61 2 0 0 -27 9 33 21 24 14.1 12 302 -50 -27 17 17 -27 1 49 -27 19 33 -26 59 34 0.61 3 0 0 -27 33 43 21 24 15.2 11 301 -51 -27 41 28 -27 25 59 -27 43 44 -27 23 44 0.61 4 0 0 -27 57 57 21 24 16.3 10 301 -51 -28 5 43 -27 50 12 -28 7 58 -27 47 57 0.61 5 0 0 -28 22 13 21 24 17.2 9 300 -52 -28 29 59 -28 14 28 -28 32 15 -28 12 13 0.62 6 0 0 -28 46 31 21 24 18.1 8 300 -52 -28 54 18 -28 38 46 -28 56 33 -28 36 30 0.62 7 0 0 -29 10 51 21 24 18.9 7 299 -53 -29 18 37 -29 3 5 -29 20 53 -29 0 49 0.62 8 0 0 -29 35 10 21 24 19.5 6 299 -54 -29 42 57 -29 27 24 -29 45 13 -29 25 8 0.62 9 0 0 -29 59 30 21 24 20.1 5 298 -54 -30 7 17 -29 51 43 -30 9 33 -29 49 28 0.62 10 0 0 -30 23 49 21 24 20.5 4 298 -55 -30 31 36 -30 16 2 -30 33 53 -30 13 46 0.63 11 0 0 -30 48 6 21 24 20.9 3 297 -55 -30 55 54 -30 40 19 -30 58 10 -30 38 3 0.64 12 0 0 -31 12 22 21 24 21.2 2 297 -56 -31 20 10 -31 4 34 -31 22 26 -31 2 18 0.65 13 0 0 -31 36 34 21 24 21.4 2 296 -56 -31 44 22 -31 28 47 -31 46 39 -31 26 31 0.68 14 0 0 -32 0 44 21 24 21.5 1 296 -56 -32 8 32 -31 52 56 -32 10 48 -31 50 40 0.80 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: TYC 1341-00612-1 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 32 03.8183 DE: +21 11 45.337 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 32 03.8182 DE: +21 11 45.337 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.3 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1420) Radcliffe asteroid class: approx. diameter [km]: 22 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.96510 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 date of fit: 2023 Apr 27 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): 0.009", 0.001", 98.6° remarks: * orbital elements for (1420)Radcliffe : Mean anomaly = 137.8914933000 deg Arg. of pericenter = 72.9353406173 deg Long. of node = 260.7118410045 deg Inclination = 3.4899969809 deg Eccentricity = 0.0783257954 Semimajor axis = 2.7472637161 AU Perihelion dist = 2.5320821003 AU Mag: H = 12.03, G = 0.15 Epoch of elements : MJD 60409.88908171 TDT (2024 Apr 09.8891) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr27,1.00,2024,4,9,21.337964,-0.030456,-0.519790,12.521209,-0.725700,0.005639,-0.000374,0.000000,0.000000 -60.3001,21.1792,-139.73,8.01,False TYC 1341-00612-1,6.53439399,21.1959270,11.83,11.26,10.95,0.0,0,,6.55840066,21.1791623,6.44,6.30,0,0,0 1420,Radcliffe,17.70,22.297,2.9651,0,0,2.655,-2.16,,1.8,0 0,137.6991,2024,4,9,72.9353,260.7118,3.4900,0.07833,2.74726,2.53208,12.03,5.0,0.15 1.146,0.0093,0.0013,99,0.0015,Known errors,1.03,0,-1,-1 20240409_0612-1,60139.28 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org