IOTA/IOTA-ES occultation update for (1397) Umtata / UCAC4 347-184211 event on 2024 Apr 07, 02:37 UT Visible from Summary ------- On 2024 Apr 07 UT, the 20.064 km diameter asteroid (1397) Umtata will occult a 11.6 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.12 mag to 15.73 mag (the magnitude of the asteroid) for at most 0.690 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 07, 02:34 - 2024 Apr 07, 02:41 * geocentric midpoint of event [JD]: 2460407.60964409 * magnitude of target star: 11.63 * magnitude drop [mag]: 4.12 * estimated maximum duration [s]: 0.690 * Moon: 4 % sunlit, 53° distance * Sun: 75° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 80°) * approx speed of asteroid's shadow [km/s]: 29.0771 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 347-184211 by 1397 Umtata on 2024 Apr 7 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 - 25 0 0 .. .. .... .. .. .. .. .. .. -14 39 48 .. .. .. -14 41 44 .. .. .. .... - 24 0 0 -14 56 33 2 34 15.0 1 111 -74 -15 2 25 -14 50 42 -15 4 21 -14 48 46 .... - 23 0 0 -15 18 58 2 34 15.1 2 111 -73 -15 24 50 -15 13 7 -15 26 45 -15 11 11 0.14 - 22 0 0 -15 41 9 2 34 15.3 3 110 -72 -15 47 0 -15 35 18 -15 48 55 -15 33 23 0.13 - 21 0 0 -16 3 7 2 34 15.5 4 110 -71 -16 8 58 -15 57 16 -16 10 52 -15 55 21 0.12 - 20 0 0 -16 24 50 2 34 15.8 5 110 -70 -16 30 41 -16 19 0 -16 32 35 -16 17 5 0.12 - 19 0 0 -16 46 19 2 34 16.2 6 110 -69 -16 52 9 -16 40 29 -16 54 4 -16 38 35 0.11 - 18 0 0 -17 7 33 2 34 16.7 7 109 -68 -17 13 22 -17 1 44 -17 15 17 -16 59 49 0.11 - 17 0 0 -17 28 32 2 34 17.2 8 109 -67 -17 34 21 -17 22 43 -17 36 15 -17 20 48 0.11 - 16 0 0 -17 49 14 2 34 17.8 9 109 -66 -17 55 3 -17 43 26 -17 56 57 -17 41 32 0.11 - 15 0 0 -18 9 41 2 34 18.5 10 108 -65 -18 15 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56 - 5 33 47 - 5 18 0 0.11 135 0 0 - 5 0 24 2 41 12.4 24 250 77 - 5 6 21 - 4 54 28 - 5 8 18 - 4 52 31 0.11 136 0 0 - 4 34 57 2 41 14.1 23 250 78 - 4 40 53 - 4 29 0 - 4 42 50 - 4 27 4 0.11 137 0 0 - 4 9 31 2 41 15.6 22 250 78 - 4 15 27 - 4 3 34 - 4 17 24 - 4 1 38 0.11 138 0 0 - 3 44 7 2 41 17.2 21 249 79 - 3 50 3 - 3 38 11 - 3 52 0 - 3 36 14 0.11 139 0 0 - 3 18 46 2 41 18.6 20 249 80 - 3 24 42 - 3 12 50 - 3 26 39 - 3 10 53 0.11 140 0 0 - 2 53 28 2 41 20.0 19 249 80 - 2 59 24 - 2 47 32 - 3 1 21 - 2 45 36 0.11 141 0 0 - 2 28 15 2 41 21.3 18 249 81 - 2 34 11 - 2 22 19 - 2 36 7 - 2 20 22 0.11 142 0 0 - 2 3 6 2 41 22.5 16 249 81 - 2 9 2 - 1 57 10 - 2 10 58 - 1 55 14 0.12 143 0 0 - 1 38 3 2 41 23.7 15 249 81 - 1 43 58 - 1 32 7 - 1 45 55 - 1 30 11 0.12 144 0 0 - 1 13 5 2 41 24.7 14 249 81 - 1 19 0 - 1 7 10 - 1 20 57 - 1 5 14 0.12 145 0 0 - 0 48 14 2 41 25.7 13 249 81 - 0 54 9 - 0 42 19 - 0 56 6 - 0 40 23 0.12 146 0 0 - 0 23 31 2 41 26.6 12 249 81 - 0 29 25 - 0 17 36 - 0 31 22 - 0 15 40 0.12 147 0 0 0 1 5 2 41 27.5 11 249 80 - 0 4 49 0 7 0 - 0 6 45 0 8 56 0.12 148 0 0 0 25 33 2 41 28.2 10 249 80 0 19 39 0 31 27 0 17 43 0 33 23 0.12 149 0 0 0 49 52 2 41 28.9 9 249 79 0 43 58 0 55 45 0 42 2 0 57 41 0.13 150 0 0 1 14 1 2 41 29.5 8 249 79 1 8 7 1 19 54 1 6 12 1 21 50 0.13 151 0 0 1 38 0 2 41 30.0 7 249 78 1 32 7 1 43 53 1 30 11 1 45 49 0.13 152 0 0 2 1 49 2 41 30.4 6 249 77 1 55 56 2 7 42 1 54 0 2 9 37 0.14 153 0 0 2 25 26 2 41 30.8 5 249 76 2 19 34 2 31 19 2 17 38 2 33 14 0.14 154 0 0 2 48 52 2 41 31.1 3 249 76 2 43 0 2 54 44 2 41 5 2 56 40 0.16 155 0 0 3 12 6 2 41 31.3 2 249 75 3 6 14 3 17 58 3 4 19 3 19 53 0.18 156 0 0 3 35 7 2 41 31.4 1 249 74 3 29 16 3 40 59 3 27 21 3 42 54 0.24 157 0 0 3 57 56 2 41 31.5 0 249 73 3 52 5 4 3 46 3 50 10 4 5 41 0.83 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 347-184211 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 18 35.1099 DE: -20 36 54.025 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 18 35.1099 DE: -20 36 54.025 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1397) Umtata asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.014 distance from Earth [AU]: 2.01190 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): 0.014", 0.002", 79.8° remarks: * orbital elements for (1397)Umtata : Mean anomaly = 353.9581778554 deg Arg. of pericenter = 206.3977416153 deg Long. of node = 77.4201873622 deg Inclination = 3.5093572310 deg Eccentricity = 0.2543100722 Semimajor axis = 2.6820025874 AU Perihelion dist = 1.9999423159 AU Mag: H = 11.44, G = 0.15 Epoch of elements : MJD 60407.10964396 TDT (2024 Apr 07.1096) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.69,2024,4,7,2.631458,0.017025,-0.095941,16.167907,2.819569,-0.004984,-0.001190,-0.000001,0.000000 69.6572,-20.5406,141.05,6.98,False UCAC4 347-184211,20.30975271,-20.6150070,12.29,11.63,11.27,0.0,0,,20.33308475,-20.5405879,4.12,4.03,0,0,0 1397,Umtata,15.73,20.064,2.0119,0,0,5.031,12.33,,1.2,0 0,353.9336,2024,4,7,206.3977,77.4202,3.5094,0.25431,2.68200,1.99994,11.43,5.0,0.15 1.164,0.0143,0.0023,80,0.0023,Known errors,1.06,0,-1,-1 20240407_184211,60139.28 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org