IOTA/IOTA-ES occultation update for (1420) Radcliffe / TYC 4930-01072-1 event on 2024 Nov 15, 08:34 UT Visible from Summary ------- On 2024 Nov 15 UT, the 22.121483027909 km diameter asteroid (1420) Radcliffe will occult a 9.2 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.70 mag to 17.90 mag (the magnitude of the asteroid) for at most 0.710 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: 100 * date and approx. time of event: 2024 Nov 15, 08:31 - 2024 Nov 15, 08:38 * geocentric midpoint of event [JD]: 2460629.85762683 * magnitude of target star: 9.20 * magnitude drop [mag]: 8.70 * estimated maximum duration [s]: 0.710 * Moon: 99 % sunlit, 130° distance * Sun: 58° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.001", 114°) * approx speed of asteroid's shadow [km/s]: 31.4679 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4930-01072-1 by 1420 Radcliffe on 2024 Nov 15 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 - 98 0 0 13 36 17 8 31 41.0 0 91 -57 13 30 4 13 42 29 13 28 51 13 43 43 .... - 97 0 0 13 35 3 8 31 41.1 1 91 -56 13 28 50 13 41 15 13 27 37 13 42 29 0.14 - 96 0 0 13 33 21 8 31 41.2 2 91 -55 13 27 9 13 39 34 13 25 55 13 40 47 0.17 - 95 0 0 13 31 12 8 31 41.3 3 92 -54 13 25 0 13 37 25 13 23 46 13 38 39 0.19 - 94 0 0 13 28 36 8 31 41.6 4 92 -53 13 22 23 13 34 49 13 21 10 13 36 3 0.20 - 93 0 0 13 25 33 8 31 41.8 5 92 -52 13 19 20 13 31 45 13 18 6 13 32 59 0.20 - 92 0 0 13 22 2 8 31 42.2 6 92 -51 13 15 48 13 28 14 13 14 34 13 29 28 0.20 - 91 0 0 13 18 3 8 31 42.6 7 93 -51 13 11 50 13 24 16 13 10 36 13 25 30 0.21 - 90 0 0 13 13 37 8 31 43.1 8 93 -50 13 7 23 13 19 50 13 6 9 13 21 4 0.21 - 89 0 0 13 8 44 8 31 43.6 9 93 -49 13 2 30 13 14 57 13 1 16 13 16 11 0.21 - 88 0 0 13 3 23 8 31 44.2 10 93 -48 12 57 9 13 9 37 12 55 54 13 10 51 0.21 - 87 0 0 12 57 34 8 31 44.8 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270 56 -38 18 41 -38 6 18 -38 19 54 -38 5 4 0.29 80 0 0 -38 11 59 8 38 16.9 0 269 55 -38 18 11 -38 5 48 -38 19 24 -38 4 34 0.45 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 4930-01072-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 11 36 07.3343 DE: -00 41 23.976 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 11 36 07.3345 DE: -00 41 23.977 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 9.2 * B mag [mag]: 9.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1420) Radcliffe asteroid class: approx. diameter [km]: 22 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.35760 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): 0.008", 0.001", 114.224° remarks: * orbital elements for (1420)Radcliffe : Mean anomaly = 185.5056501489 deg Arg. of pericenter = 72.8421910746 deg Long. of node = 260.7108459342 deg Inclination = 3.4899835340 deg Eccentricity = 0.0782857751 Semimajor axis = 2.7472427671 AU Perihelion dist = 2.5321727377 AU Mag: H = 12.03, G = 0.15 Epoch of elements : MJD 60629.35762704 TDT (2024 Nov 15.3576) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr27,0.71,2024,11,15,8.583044,-0.092500,-0.190668,15.996246,-7.719224,-0.004671,0.001838,-0.000001,0.000000 -9.3259,-0.8258,47.42,-18.64,False TYC 4930-01072-1,11.60203728,-0.6899931,9.45,9.20,9.07,0.1,0,,11.62304674,-0.8257876,8.70,8.39,0,0,0 1420,Radcliffe,17.90,22.365,3.3576,0,0,2.794,-20.22,,1.8,0 0,185.4282,2024,11,15,72.8422,260.7108,3.4900,0.07829,2.74724,2.53217,12.03,5.0,0.15 1.099,0.0083,0.0009,114,0.0009,Known errors,1.83,0,-1,-1 20241115_1072-1,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org