IOTA/IOTA-ES occultation update for (11738) 1998 RK72 / UCAC4 527-050094 event on 2024 Apr 10, 01:35 UT Visible from Summary ------- On 2024 Apr 10 UT, the 18.455 km diameter asteroid (11738) 1998 RK72 will occult a 11.5 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 6.87 mag to 18.36 mag (the magnitude of the asteroid) for at most 7.570 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: 98 * date and approx. time of event: 2024 Apr 10, 00:52 - 2024 Apr 10, 02:18 * geocentric midpoint of event [JD]: 2460410.56613421 * magnitude of target star: 11.49 * magnitude drop [mag]: 6.87 * estimated maximum duration [s]: 7.570 * Moon: 2 % sunlit, 105° distance * Sun: 123° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 16.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.003", 107°) * approx speed of asteroid's shadow [km/s]: 2.4392 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 527-050094 by 11738 1998 RK72 on 2024 Apr 10 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 -176 0 0 1 32 7 2 17 50.5 1 75 51 1 37 30 1 26 44 1 41 22 1 22 52 .... -175 0 0 1 48 9 2 17 49.5 2 75 51 1 53 31 1 42 46 1 57 23 1 38 54 0.15 -174 0 0 2 3 49 2 17 47.5 3 75 50 2 9 11 1 58 27 2 13 2 1 54 35 0.20 -173 0 0 2 19 7 2 17 44.7 4 75 49 2 24 29 2 13 46 2 28 20 2 9 55 0.22 -172 0 0 2 34 4 2 17 41.1 5 75 48 2 39 25 2 28 43 2 43 15 2 24 52 0.23 -171 0 0 2 48 39 2 17 36.7 6 75 47 2 54 0 2 43 19 2 57 50 2 39 29 0.24 -170 0 0 3 2 53 2 17 31.5 7 75 46 3 8 13 2 57 33 3 12 2 2 53 43 0.24 -169 0 0 3 16 45 2 17 25.4 8 75 45 3 22 4 3 11 25 3 25 54 3 7 36 0.25 -168 0 0 3 30 16 2 17 18.6 9 75 44 3 35 34 3 24 57 3 39 23 3 21 7 0.25 -167 0 0 3 43 25 2 17 11.0 10 75 43 3 48 43 3 38 6 3 52 32 3 34 17 0.25 -166 0 0 3 56 12 2 17 2.7 11 75 42 4 1 30 3 50 54 4 5 18 3 47 6 0.25 -165 0 0 4 8 39 2 16 53.6 12 75 41 4 13 56 4 3 21 4 17 44 3 59 33 0.25 -164 0 0 4 20 44 2 16 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29.2 44 304 -76 -11 10 8 -11 21 7 -11 6 12 -11 25 3 0.28 - 29 0 0 -11 35 53 1 4 59.6 43 304 -77 -11 30 24 -11 41 23 -11 26 27 -11 45 19 0.28 - 28 0 0 -11 56 13 1 4 30.5 42 303 -77 -11 50 43 -12 1 42 -11 46 46 -12 5 39 0.28 - 27 0 0 -12 16 35 1 4 1.9 41 303 -78 -12 11 5 -12 22 5 -12 7 9 -12 26 2 0.28 - 26 0 0 -12 37 1 1 3 33.8 40 303 -79 -12 31 31 -12 42 31 -12 27 34 -12 46 28 0.28 - 25 0 0 -12 57 29 1 3 6.1 39 302 -79 -12 51 59 -13 3 0 -12 48 2 -13 6 57 0.28 - 24 0 0 -13 18 0 1 2 39.0 38 302 -80 -13 12 30 -13 23 31 -13 8 33 -13 27 28 0.28 - 23 0 0 -13 38 33 1 2 12.3 37 302 -81 -13 33 3 -13 44 4 -13 29 5 -13 48 1 0.28 - 22 0 0 -13 59 8 1 1 46.2 37 301 -81 -13 53 37 -14 4 38 -13 49 40 -14 8 36 0.28 - 21 0 0 -14 19 43 1 1 20.6 36 301 -81 -14 14 13 -14 25 14 -14 10 15 -14 29 12 0.28 - 20 0 0 -14 40 20 1 0 55.6 35 301 -82 -14 34 49 -14 45 51 -14 30 52 -14 49 49 0.28 - 19 0 0 -15 0 58 1 0 31.1 34 300 -82 -14 55 27 -15 6 29 -14 51 29 -15 10 27 0.28 - 18 0 0 -15 21 36 1 0 7.2 33 300 -82 -15 16 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31 5 0.29 7 0 0 -23 40 18 0 53 34.5 9 291 -65 -23 34 48 -23 45 47 -23 30 52 -23 49 44 0.29 8 0 0 -23 58 47 0 53 27.6 9 291 -64 -23 53 18 -24 4 17 -23 49 22 -24 8 13 0.29 9 0 0 -24 17 7 0 53 21.5 8 291 -63 -24 11 38 -24 22 36 -24 7 42 -24 26 32 0.29 10 0 0 -24 35 16 0 53 16.1 7 290 -63 -24 29 47 -24 40 45 -24 25 51 -24 44 41 0.29 11 0 0 -24 53 14 0 53 11.4 6 290 -62 -24 47 45 -24 58 42 -24 43 50 -25 2 38 0.29 12 0 0 -25 11 0 0 53 7.4 5 289 -61 -25 5 32 -25 16 28 -25 1 37 -25 20 24 0.29 13 0 0 -25 28 35 0 53 4.2 4 289 -60 -25 23 7 -25 34 3 -25 19 12 -25 37 58 0.29 14 0 0 -25 45 57 0 53 1.6 3 288 -59 -25 40 30 -25 51 25 -25 36 35 -25 55 20 0.29 15 0 0 -26 3 7 0 52 59.8 2 288 -58 -25 57 40 -26 8 34 -25 53 46 -26 12 29 0.30 16 0 0 -26 20 4 0 52 58.7 1 288 -57 -26 14 38 -26 25 31 -26 10 43 -26 29 26 0.31 17 0 0 -26 36 48 0 52 58.3 0 287 -56 -26 31 22 -26 42 15 -26 27 28 -26 46 9 0.53 Uncertainty in time = +/- 17 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 527-050094 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 46 17.8518 DE: +15 21 57.357 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 46 17.8515 DE: +15 21 57.359 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.5 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (11738) 1998 RK72 asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.009 distance from Earth [AU]: 2.76780 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#42 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): 0.020", 0.003", 107.2° remarks: * orbital elements for (11738)1998 RK72 : Mean anomaly = 249.4378947466 deg Arg. of pericenter = 168.4485920511 deg Long. of node = 115.8825398378 deg Inclination = 2.2084667270 deg Eccentricity = 0.1612006244 Semimajor axis = 3.1758511216 AU Perihelion dist = 2.6639019377 AU Mag: H = 12.67, G = 0.15 Epoch of elements : MJD 60410.06613484 TDT (2024 Apr 10.0661) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#422023Apr25,7.57,2024,4,10,1.587221,-0.055191,-0.219112,-1.333185,0.343590,0.004611,-0.001741,0.000001,0.000000 -75.6815,15.2539,156.52,8.08,False UCAC4 527-050094,9.77162551,15.3659326,11.83,11.49,11.31,0.0,0,,9.79386317,15.2539248,6.87,6.60,0,0,0 11738,1998 RK72,18.36,18.455,2.7678,0,0,-0.292,1.09,,2.6,0 0,249.2522,2024,4,9,168.4486,115.8825,2.2085,0.16120,3.17585,2.66390,12.67,5.0,0.15 1.359,0.0203,0.0032,107,0.0033,Known errors,1.24,0,-1,-1 20240410_050094,60139.28 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org