IOTA/IOTA-ES occultation update for (1397) Umtata / UCAC4 362-200448 event on 2024 Jul 25, 14:29 UT Visible from Summary ------- On 2024 Jul 25 UT, the 20.018 km diameter asteroid (1397) Umtata will occult a 11.7 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.39 mag to 13.92 mag (the magnitude of the asteroid) for at most 3.940 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 Jul 25, 14:10 - 2024 Jul 25, 14:47 * geocentric midpoint of event [JD]: 2460517.10367495 * magnitude of target star: 11.66 * magnitude drop [mag]: 2.39 * estimated maximum duration [s]: 3.940 * Moon: 78 % sunlit, 32° distance * Sun: 155° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.011) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.004", 69°) * approx speed of asteroid's shadow [km/s]: 5.0821 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 362-200448 by 1397 Umtata on 2024 Jul 25 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 42 0 0 -61 0 3 14 47 18.1 0 128 -13 -60 52 14 -61 7 53 -60 47 14 -61 12 55 .... 43 0 0 -61 22 28 14 47 17.9 1 127 -14 -61 14 42 -61 30 14 -61 9 44 -61 35 14 0.55 44 0 0 -61 44 10 14 47 17.5 2 126 -14 -61 36 28 -61 51 54 -61 31 32 -61 56 51 0.56 45 0 0 -62 5 13 14 47 17.0 2 125 -15 -61 57 33 -62 12 53 -61 52 39 -62 17 48 0.56 46 0 0 -62 25 36 14 47 16.4 3 124 -15 -62 17 59 -62 33 13 -62 13 8 -62 38 6 0.56 47 0 0 -62 45 20 14 47 15.6 3 123 -16 -62 37 47 -62 52 54 -62 32 57 -62 57 45 0.56 48 0 0 -63 4 27 14 47 14.7 4 122 -16 -62 56 57 -63 11 58 -62 52 9 -63 16 47 0.56 49 0 0 -63 22 58 14 47 13.7 4 122 -17 -63 15 31 -63 30 26 -63 10 44 -63 35 13 0.56 50 0 0 -63 40 53 14 47 12.6 5 121 -17 -63 33 28 -63 48 17 -63 28 44 -63 53 3 0.56 51 0 0 -63 58 13 14 47 11.4 5 120 -18 -63 50 52 -64 5 35 -63 46 9 -64 10 18 0.56 52 0 0 -64 14 59 14 47 10.1 6 119 -18 -64 7 41 -64 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27.6 18 252 6 - 1 54 35 - 2 8 34 - 1 50 6 - 2 13 3 0.56 -113 0 0 - 1 29 33 14 12 19.0 17 252 7 - 1 22 36 - 1 36 31 - 1 18 9 - 1 40 59 0.56 -112 0 0 - 0 58 16 14 12 11.0 16 252 9 - 0 51 21 - 1 5 12 - 0 46 55 - 1 9 38 0.56 -111 0 0 - 0 27 43 14 12 3.5 15 252 10 - 0 20 50 - 0 34 37 - 0 16 25 - 0 39 2 0.57 -110 0 0 0 2 6 14 11 56.5 14 252 11 0 8 57 - 0 4 46 0 13 20 - 0 9 10 0.57 -109 0 0 0 31 9 14 11 50.1 13 252 12 0 37 59 0 24 19 0 42 21 0 19 56 0.57 -108 0 0 0 59 28 14 11 44.2 12 252 13 1 6 15 0 52 40 1 10 36 0 48 18 0.57 -107 0 0 1 27 1 14 11 38.8 11 252 14 1 33 47 1 20 14 1 38 6 1 15 54 0.58 -106 0 0 1 53 48 14 11 33.9 10 252 15 2 0 32 1 47 4 2 4 51 1 42 44 0.58 -105 0 0 2 19 50 14 11 29.5 9 252 16 2 26 32 2 13 7 2 30 50 2 8 49 0.59 -104 0 0 2 45 5 14 11 25.6 8 252 17 2 51 46 2 38 24 2 56 3 2 34 7 0.60 -103 0 0 3 9 35 14 11 22.3 7 252 18 3 16 14 3 2 55 3 20 29 2 58 39 0.61 -102 0 0 3 33 18 14 11 19.4 6 252 19 3 39 55 3 26 40 3 44 10 3 22 24 0.62 -101 0 0 3 56 14 14 11 17.1 4 252 20 4 2 50 3 49 38 4 7 4 3 45 23 0.64 -100 0 0 4 18 24 14 11 15.3 3 252 21 4 24 59 4 11 49 4 29 11 4 7 36 0.66 - 99 0 0 4 39 47 14 11 13.9 2 252 22 4 46 20 4 33 14 4 50 32 4 29 1 0.72 - 98 0 0 5 0 23 14 11 13.0 1 252 23 5 6 55 4 53 51 5 11 6 4 49 40 0.85 - 97 0 0 5 20 13 14 11 12.7 0 252 25 5 26 43 5 13 42 5 30 53 5 9 31 1.95 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 362-200448 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 04 55.0894 DE: -17 46 11.822 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 04 55.0895 DE: -17 46 11.821 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1397) Umtata asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.025 distance from Earth [AU]: 1.09540 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 date of fit: 2023 Apr 24 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): 0.028", 0.004", 69.16° remarks: * orbital elements for (1397)Umtata : Mean anomaly = 18.5345530527 deg Arg. of pericenter = 206.3930383013 deg Long. of node = 77.4202102244 deg Inclination = 3.5093586546 deg Eccentricity = 0.2542191929 Semimajor axis = 2.6816695049 AU Perihelion dist = 1.9999376477 AU Mag: H = 11.44, G = 0.15 Epoch of elements : MJD 60516.60367646 TDT (2024 Jul 25.6037) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,3.94,2024,7,25,14.488199,0.294751,-0.407853,-2.324713,-1.680488,-0.002154,-0.000322,0.000001,0.000000 170.4568,-17.6492,-35.68,19.46,False UCAC4 362-200448,22.08196927,-17.7699504,11.92,11.66,11.52,0.0,0,,22.10468926,-17.6492275,2.39,2.12,0,0,0 1397,Umtata,13.92,20.018,1.0954,0,0,-1.306,-13.49,,1.2,0 0,18.3991,2024,7,25,206.3930,77.4202,3.5094,0.25422,2.68167,1.99994,11.43,5.0,0.15 1.320,0.0280,0.0037,69,0.0081,Known errors,1.03,0,-1,-1 20240725_200448,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org