IOTA/IOTA-ES occultation update for (1397) Umtata / UCAC4 336-181582 event on 2024 Mar 01, 10:43 UT Visible from Summary ------- On 2024 Mar 01 UT, the 20.0786312335935 km diameter asteroid (1397) Umtata will occult a 9.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.38 mag to 16.00 mag (the magnitude of the asteroid) for at most 0.530 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 Mar 01, 10:41 - 2024 Mar 01, 10:46 * geocentric midpoint of event [JD]: 2460370.94706787 * magnitude of target star: 9.62 * magnitude drop [mag]: 6.38 * estimated maximum duration [s]: 0.530 * Moon: 72 % sunlit, 59° distance * Sun: 57° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 88°) * approx speed of asteroid's shadow [km/s]: 38.4352 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 336-181582 by 1397 Umtata on 2024 Mar 1 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 -122 0 0 5 13 43 10 41 3.0 1 113 -55 5 7 40 5 19 46 5 5 39 5 21 47 .... -121 0 0 4 48 23 10 41 3.1 2 113 -54 4 42 21 4 54 26 4 40 19 4 56 27 -0.04 -120 0 0 4 23 9 10 41 3.2 3 113 -53 4 17 7 4 29 12 4 15 6 4 31 13 -0.09 -119 0 0 3 58 3 10 41 3.4 4 113 -52 3 52 1 4 4 5 3 50 0 4 6 6 -0.11 -118 0 0 3 33 3 10 41 3.7 5 113 -51 3 27 2 3 39 5 3 25 1 3 41 6 -0.12 -117 0 0 3 8 12 10 41 4.0 6 113 -50 3 2 11 3 14 14 3 0 10 3 16 15 -0.13 -116 0 0 2 43 30 10 41 4.3 7 113 -49 2 37 29 2 49 31 2 35 28 2 51 32 -0.13 -115 0 0 2 18 56 10 41 4.8 8 113 -48 2 12 56 2 24 57 2 10 55 2 26 58 -0.14 -114 0 0 1 54 33 10 41 5.2 9 113 -47 1 48 33 2 0 33 1 46 32 2 2 34 -0.14 -113 0 0 1 30 20 10 41 5.8 10 114 -46 1 24 20 1 36 20 1 22 20 1 38 21 -0.15 -112 0 0 1 6 18 10 41 6.4 11 114 -45 1 0 19 1 12 18 0 58 18 1 14 18 -0.15 -111 0 0 0 42 28 10 41 7.1 13 114 -43 0 36 29 0 48 27 0 34 28 0 50 27 -0.15 -110 0 0 0 18 49 10 41 7.8 14 114 -42 0 12 51 0 24 48 0 10 51 0 26 48 -0.15 -109 0 0 - 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2 59 47 - 2 47 58 - 3 1 46 - 2 45 59 -0.17 12 0 0 - 2 32 14 10 45 52.2 39 242 79 - 2 38 9 - 2 26 19 - 2 40 9 - 2 24 20 -0.17 13 0 0 - 2 10 19 10 45 54.2 38 242 80 - 2 16 15 - 2 4 23 - 2 18 14 - 2 2 24 -0.17 14 0 0 - 1 48 8 10 45 56.1 37 242 81 - 1 54 5 - 1 42 12 - 1 56 4 - 1 40 13 -0.17 15 0 0 - 1 25 42 10 45 58.0 36 243 81 - 1 31 39 - 1 19 45 - 1 33 38 - 1 17 45 -0.17 16 0 0 - 1 3 0 10 45 59.8 35 243 82 - 1 8 58 - 0 57 3 - 1 10 57 - 0 55 3 -0.17 17 0 0 - 0 40 4 10 46 1.6 34 243 82 - 0 46 2 - 0 34 6 - 0 48 2 - 0 32 7 -0.17 18 0 0 - 0 16 54 10 46 3.3 33 243 82 - 0 22 52 - 0 10 56 - 0 24 52 - 0 8 56 -0.17 19 0 0 0 6 30 10 46 5.0 32 243 82 0 0 31 0 12 29 - 0 1 29 0 14 29 -0.17 20 0 0 0 30 7 10 46 6.6 31 243 82 0 24 8 0 36 6 0 22 7 0 38 6 -0.17 21 0 0 0 53 56 10 46 8.2 30 243 82 0 47 57 0 59 56 0 45 56 1 1 56 -0.17 22 0 0 1 17 58 10 46 9.8 28 243 81 1 11 58 1 23 58 1 9 57 1 25 58 -0.17 23 0 0 1 42 11 10 46 11.3 27 243 81 1 36 10 1 48 11 1 34 10 1 50 12 -0.17 24 0 0 2 6 34 10 46 12.7 26 243 80 2 0 34 2 12 35 1 58 33 2 14 36 -0.17 25 0 0 2 31 9 10 46 14.1 25 243 80 2 25 8 2 37 10 2 23 7 2 39 11 -0.17 26 0 0 2 55 52 10 46 15.4 24 243 79 2 49 51 3 1 54 2 47 50 3 3 55 -0.16 27 0 0 3 20 45 10 46 16.7 23 243 78 3 14 43 3 26 47 3 12 42 3 28 48 -0.16 28 0 0 3 45 46 10 46 17.9 22 244 77 3 39 44 3 51 48 3 37 43 3 53 50 -0.16 29 0 0 4 10 55 10 46 19.1 21 244 76 4 4 53 4 16 58 4 2 52 4 18 59 -0.16 30 0 0 4 36 12 10 46 20.2 20 244 75 4 30 9 4 42 14 4 28 8 4 44 16 -0.16 31 0 0 5 1 35 10 46 21.2 19 244 74 4 55 32 5 7 38 4 53 30 5 9 39 -0.16 32 0 0 5 27 4 10 46 22.2 18 244 73 5 21 1 5 33 7 5 18 59 5 35 9 -0.16 33 0 0 5 52 38 10 46 23.2 17 244 73 5 46 35 5 58 41 5 44 33 6 0 43 -0.16 34 0 0 6 18 17 10 46 24.0 15 244 72 6 12 13 6 24 20 6 10 12 6 26 22 -0.16 35 0 0 6 44 0 10 46 24.9 14 244 71 6 37 56 6 50 3 6 35 54 6 52 5 -0.16 36 0 0 7 9 46 10 46 25.6 13 244 70 7 3 42 7 15 50 7 1 40 7 17 52 -0.16 37 0 0 7 35 35 10 46 26.3 12 245 69 7 29 31 7 41 39 7 27 29 7 43 41 -0.16 38 0 0 8 1 26 10 46 27.0 11 245 67 7 55 22 8 7 30 7 53 20 8 9 32 -0.16 39 0 0 8 27 18 10 46 27.6 10 245 66 8 21 14 8 33 23 8 19 12 8 35 25 -0.16 40 0 0 8 53 11 10 46 28.1 9 245 65 8 47 7 8 59 16 8 45 5 9 1 18 -0.16 41 0 0 9 19 5 10 46 28.5 8 245 64 9 13 0 9 25 9 9 10 58 9 27 11 -0.16 42 0 0 9 44 57 10 46 28.9 7 245 63 9 38 53 9 51 1 9 36 51 9 53 4 -0.16 43 0 0 10 10 48 10 46 29.3 6 246 62 10 4 44 10 16 53 10 2 42 10 18 55 -0.16 44 0 0 10 36 38 10 46 29.6 5 246 61 10 30 33 10 42 42 10 28 31 10 44 44 -0.15 45 0 0 11 2 25 10 46 29.8 4 246 60 10 56 20 11 8 29 10 54 18 11 10 31 -0.15 46 0 0 11 28 8 10 46 30.0 3 246 59 11 22 4 11 34 13 11 20 2 11 36 15 -0.15 47 0 0 11 53 48 10 46 30.1 1 246 58 11 47 44 11 59 52 11 45 42 12 1 54 -0.13 48 0 0 12 19 23 10 46 30.1 0 247 57 12 13 19 12 25 28 12 11 17 12 27 30 -0.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 13.9 Data for the target star ------------------------ * name: UCAC4 336-181582 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 58 46.0255 DE: -22 51 02.216 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 58 46.0256 DE: -22 51 02.216 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.6 * B mag [mag]: 10.4 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1397) Umtata asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.012 distance from Earth [AU]: 2.39040 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): 0.012", 0.002", 87.9° remarks: * orbital elements for (1397)Umtata : Mean anomaly = 345.7319697138 deg Arg. of pericenter = 206.3979545803 deg Long. of node = 77.4201760590 deg Inclination = 3.5093532626 deg Eccentricity = 0.2543363373 Semimajor axis = 2.6820944084 AU Perihelion dist = 1.9999403404 AU Mag: H = 11.44, G = 0.15 Epoch of elements : MJD 60370.44706766 TDT (2024 Mar 01.4471) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.53,2024,3,1,10.729629,-0.010628,0.168170,21.646827,1.428359,-0.004527,-0.000473,-0.000001,0.000000 -35.6238,-22.8190,22.11,-7.31,False UCAC4 336-181582,18.97945147,-22.8506156,10.44,9.62,9.18,0.1,0,,19.00344238,-22.8189846,6.38,6.37,0,0,0 1397,Umtata,16.00,20.252,2.3904,0,0,5.760,5.26,,1.2,0 0,345.6317,2024,3,1,206.3980,77.4202,3.5094,0.25434,2.68209,1.99994,11.43,5.0,0.15 1.168,0.0123,0.0019,88,0.0020,Known errors,0.86,0,-1,-1 20240301_181582,60138.90 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 21:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org