IOTA/IOTA-ES occultation update for (9200) 1993 FK21 / UCAC4 372-068748 event on 2024 Apr 11, 22:31 UT Visible from Summary ------- On 2024 Apr 11 UT, the 8.86131605034363 km diameter asteroid (9200) 1993 FK21 will occult a 11.4 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.32 mag to 17.68 mag (the magnitude of the asteroid) for at most 0.940 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 11, 22:21 - 2024 Apr 11, 22:41 * geocentric midpoint of event [JD]: 2460412.43865612 * magnitude of target star: 11.36 * magnitude drop [mag]: 6.32 * estimated maximum duration [s]: 0.940 * Moon: 13 % sunlit, 162° distance * Sun: 155° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.002", 105°) * approx speed of asteroid's shadow [km/s]: 9.5448 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 372-068748 by 9200 1993 FK21 on 2024 Apr 11 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 - 46 0 0 - 6 2 36 22 41 35.7 1 106 -25 - 5 59 46 - 6 5 26 - 5 58 2 - 6 7 11 .... - 45 0 0 - 6 20 29 22 41 35.4 2 106 -26 - 6 17 39 - 6 23 19 - 6 15 54 - 6 25 4 0.42 - 44 0 0 - 6 38 49 22 41 34.8 3 106 -27 - 6 35 58 - 6 41 39 - 6 34 13 - 6 43 24 0.45 - 43 0 0 - 6 57 35 22 41 33.9 4 106 -28 - 6 54 44 - 7 0 26 - 6 52 59 - 7 2 11 0.46 - 42 0 0 - 7 16 47 22 41 32.8 5 105 -29 - 7 13 55 - 7 19 38 - 7 12 10 - 7 21 23 0.46 - 41 0 0 - 7 36 24 22 41 31.5 6 105 -30 - 7 33 33 - 7 39 16 - 7 31 47 - 7 41 2 0.47 - 40 0 0 - 7 56 27 22 41 29.9 7 105 -31 - 7 53 35 - 7 59 19 - 7 51 50 - 8 1 5 0.47 - 39 0 0 - 8 16 55 22 41 28.0 8 105 -32 - 8 14 3 - 8 19 48 - 8 12 17 - 8 21 34 0.47 - 38 0 0 - 8 37 48 22 41 26.0 9 105 -33 - 8 34 55 - 8 40 40 - 8 33 9 - 8 42 26 0.48 - 37 0 0 - 8 59 4 22 41 23.6 10 105 -34 - 8 56 11 - 9 1 57 - 8 54 25 - 9 3 43 0.48 - 36 0 0 - 9 20 44 22 41 21.1 11 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254 14 -48 11 3 -48 16 48 -48 9 17 -48 18 34 0.54 148 0 0 -47 59 28 22 21 49.7 6 253 15 -47 56 35 -48 2 21 -47 54 49 -48 4 8 0.54 149 0 0 -47 44 39 22 21 48.7 6 252 15 -47 41 45 -47 47 32 -47 39 59 -47 49 19 0.55 150 0 0 -47 29 26 22 21 47.9 5 252 16 -47 26 32 -47 32 20 -47 24 46 -47 34 7 0.56 151 0 0 -47 13 51 22 21 47.1 4 251 17 -47 10 57 -47 16 46 -47 9 10 -47 18 33 0.57 152 0 0 -46 57 54 22 21 46.5 3 250 17 -46 54 59 -47 0 48 -46 53 12 -47 2 36 0.59 153 0 0 -46 41 33 22 21 46.0 3 250 18 -46 38 38 -46 44 28 -46 36 50 -46 46 16 0.62 154 0 0 -46 24 49 22 21 45.6 2 249 19 -46 21 54 -46 27 45 -46 20 6 -46 29 33 0.67 155 0 0 -46 7 42 22 21 45.3 1 248 20 -46 4 46 -46 10 38 -46 2 58 -46 12 26 0.78 156 0 0 -45 50 12 22 21 45.2 0 247 20 -45 47 16 -45 53 8 -45 45 27 -45 54 57 1.39 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 372-068748 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 01 23.3850 DE: -15 47 52.862 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 01 23.3850 DE: -15 47 52.862 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.4 * B mag [mag]: 12.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9200) 1993 FK21 asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.007 distance from Earth [AU]: 1.76050 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#44 date of fit: 2023 Apr 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): 0.011", 0.002", 105.2° remarks: * orbital elements for (9200)1993 FK21 : Mean anomaly = 249.5342023868 deg Arg. of pericenter = 154.5991490482 deg Long. of node = 193.7287991719 deg Inclination = 2.0184795840 deg Eccentricity = 0.2017600341 Semimajor axis = 2.4505523741 AU Perihelion dist = 1.9561288436 AU Mag: H = 13.68, G = 0.15 Epoch of elements : MJD 60411.93865617 TDT (2024 Apr 11.9387) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#442023Apr25,0.94,2024,4,11,22.527747,-0.161543,-0.422349,-5.031662,1.925113,-0.002354,0.000557,0.000001,0.000000 47.1459,-15.8956,-157.71,8.76,False UCAC4 372-068748,15.02316248,-15.7980171,12.22,11.36,10.90,0.1,0,,15.04592955,-15.8955855,6.32,6.33,0,0,0 9200,1993 FK21,17.68,8.989,1.7605,0,0,-1.742,9.62,,1.4,0 0,249.2930,2024,4,11,154.5991,193.7288,2.0185,0.20176,2.45055,1.95613,13.68,5.0,0.15 1.307,0.0107,0.0019,105,0.0022,Known errors,0.95,0,-1,-1 20240411_068748,60139.29 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org