IOTA/IOTA-ES occultation update for (375) Ursula / TYC 6739-00692-1 event on 2024 Sep 19, 11:09 UT Visible from Summary ------- On 2024 Sep 19 UT, the 195.372 km diameter asteroid (375) Ursula will occult a 11.2 mag star in the constellation Hydra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.51 mag to 13.56 mag (the magnitude of the asteroid) for at most 5.160 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: 100 * date and approx. time of event: 2024 Sep 19, 11:07 - 2024 Sep 19, 11:12 * geocentric midpoint of event [JD]: 2460572.96514638 * magnitude of target star: 11.16 * magnitude drop [mag]: 2.51 * estimated maximum duration [s]: 5.160 * Moon: 97 % sunlit, 152° distance * Sun: 46° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 202 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 117°) * approx speed of asteroid's shadow [km/s]: 37.8975 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6739-00692-1 by 375 Ursula on 2024 Sep 19 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 - 26 0 0 26 46 32 11 7 6.2 0 121 46 25 42 49 .. .. .. 25 36 55 .. .. .. .... - 25 0 0 26 13 51 11 7 6.2 1 122 47 25 10 2 27 18 2 25 4 7 27 24 1 -0.03 - 24 0 0 25 40 48 11 7 6.3 2 122 48 24 36 52 26 45 6 24 30 57 26 51 6 -0.13 - 23 0 0 25 7 24 11 7 6.5 3 122 49 24 3 22 26 11 48 23 57 26 26 17 49 -0.17 - 22 0 0 24 33 39 11 7 6.7 5 123 50 23 29 31 25 38 9 23 23 34 25 44 10 -0.19 - 21 0 0 23 59 34 11 7 7.0 6 123 51 22 55 20 25 4 10 22 49 23 25 10 11 -0.20 - 20 0 0 23 25 10 11 7 7.4 7 124 52 22 20 51 24 29 51 22 14 53 24 35 53 -0.21 - 19 0 0 22 50 28 11 7 7.8 8 124 53 21 46 4 23 55 14 21 40 6 24 1 16 -0.22 - 18 0 0 22 15 28 11 7 8.3 9 124 54 21 11 0 23 20 18 21 5 1 23 26 21 -0.22 - 17 0 0 21 40 11 11 7 8.8 10 125 55 20 35 39 22 45 6 20 29 41 22 51 9 -0.23 - 16 0 0 21 4 40 11 7 9.4 11 125 57 20 0 4 22 9 38 19 54 5 22 15 41 -0.23 - 15 0 0 20 28 54 11 7 10.1 12 126 58 19 24 15 21 33 54 19 18 16 21 39 58 -0.23 - 14 0 0 19 52 54 11 7 10.8 13 126 59 18 48 13 20 57 57 18 42 13 21 4 1 -0.24 - 13 0 0 19 16 42 11 7 11.6 14 126 60 18 11 59 20 21 47 18 5 59 20 27 52 -0.24 - 12 0 0 18 40 19 11 7 12.5 16 127 61 17 35 34 19 45 26 17 29 34 19 51 30 -0.24 - 11 0 0 18 3 46 11 7 13.5 17 127 62 16 59 0 19 8 54 16 53 0 19 14 58 -0.24 - 10 0 0 17 27 3 11 7 14.5 18 127 63 16 22 17 18 32 12 16 16 17 18 38 16 -0.24 - 9 0 0 16 50 13 11 7 15.6 19 128 64 15 45 27 17 55 22 15 39 27 18 1 26 -0.24 - 8 0 0 16 13 16 11 7 16.7 20 128 66 15 8 30 17 18 25 15 2 30 17 24 29 -0.24 - 7 0 0 15 36 14 11 7 18.0 21 128 67 14 31 29 16 41 22 14 25 29 16 47 26 -0.25 - 6 0 0 14 59 8 11 7 19.3 22 129 68 13 54 24 16 4 14 13 48 24 16 10 18 -0.25 - 5 0 0 14 21 58 11 7 20.6 24 129 69 13 17 16 15 27 3 13 11 17 15 33 7 -0.25 - 4 0 0 13 44 47 11 7 22.1 25 129 70 12 40 7 14 49 49 12 34 8 14 55 53 -0.25 - 3 0 0 13 7 36 11 7 23.5 26 130 71 12 2 59 14 12 35 11 56 59 14 18 38 -0.25 - 2 0 0 12 30 25 11 7 25.1 27 130 72 11 25 51 13 35 21 11 19 52 13 41 24 -0.25 - 1 0 0 11 53 16 11 7 26.7 28 130 74 10 48 46 12 58 8 10 42 47 13 4 11 -0.25 0 0 0 11 16 10 11 7 28.4 29 130 75 10 11 44 12 20 58 10 5 46 12 27 1 -0.25 1 0 0 10 39 9 11 7 30.2 30 131 76 9 34 48 11 43 53 9 28 50 11 49 55 -0.25 2 0 0 10 2 14 11 7 32.0 32 131 77 8 57 58 11 6 52 8 52 0 11 12 54 -0.25 3 0 0 9 25 26 11 7 33.9 33 131 78 8 21 15 10 29 58 8 15 18 10 35 59 -0.25 4 0 0 8 48 45 11 7 35.8 34 132 79 7 44 41 9 53 12 7 38 44 9 59 13 -0.25 5 0 0 8 12 15 11 7 37.8 35 132 80 7 8 16 9 16 35 7 2 20 9 22 35 -0.25 6 0 0 7 35 54 11 7 39.9 36 132 82 6 32 3 8 40 8 6 26 8 8 46 7 -0.25 7 0 0 6 59 46 11 7 42.0 37 132 83 5 56 1 8 3 53 5 50 7 8 9 51 -0.25 8 0 0 6 23 51 11 7 44.2 38 133 84 5 20 13 7 27 50 5 14 19 7 33 48 -0.25 9 0 0 5 48 9 11 7 46.4 40 133 85 4 44 39 6 52 0 4 38 46 6 57 57 -0.25 10 0 0 5 12 43 11 7 48.7 41 133 86 4 9 21 6 16 26 4 3 29 6 22 22 -0.26 11 0 0 4 37 33 11 7 51.0 42 134 87 3 34 19 5 41 7 3 28 28 5 47 3 -0.26 12 0 0 4 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0 - 7 21 13 11 12 24.6 16 244 -23 - 8 20 13 - 6 21 55 - 8 25 41 - 6 16 23 -0.26 124 0 0 - 6 56 32 11 12 25.5 15 243 -24 - 7 55 42 - 5 57 3 - 8 1 12 - 5 51 31 -0.26 125 0 0 - 6 31 19 11 12 26.3 14 243 -25 - 7 30 41 - 5 31 40 - 7 36 11 - 5 26 7 -0.26 126 0 0 - 6 5 36 11 12 27.1 13 243 -26 - 7 5 8 - 5 5 47 - 7 10 39 - 5 0 12 -0.26 127 0 0 - 5 39 23 11 12 27.8 12 243 -27 - 6 39 5 - 4 39 23 - 6 44 37 - 4 33 47 -0.26 128 0 0 - 5 12 39 11 12 28.4 11 243 -28 - 6 12 32 - 4 12 28 - 6 18 5 - 4 6 52 -0.26 129 0 0 - 4 45 26 11 12 29.0 9 243 -29 - 5 45 29 - 3 45 4 - 5 51 3 - 3 39 27 -0.26 130 0 0 - 4 17 43 11 12 29.5 8 243 -30 - 5 17 57 - 3 17 11 - 5 23 32 - 3 11 32 -0.26 131 0 0 - 3 49 32 11 12 30.0 7 243 -31 - 4 49 56 - 2 48 49 - 4 55 32 - 2 43 9 -0.26 132 0 0 - 3 20 52 11 12 30.4 6 243 -32 - 4 21 27 - 2 19 58 - 4 27 4 - 2 14 18 -0.26 133 0 0 - 2 51 44 11 12 30.7 5 243 -33 - 3 52 30 - 1 50 40 - 3 58 8 - 1 44 58 -0.26 134 0 0 - 2 22 9 11 12 30.9 4 243 -34 - 3 23 5 - 1 20 54 - 3 28 44 - 1 15 12 -0.26 135 0 0 - 1 52 7 11 12 31.1 3 243 -35 - 2 53 14 - 0 50 42 - 2 58 54 - 0 44 58 -0.26 136 0 0 - 1 21 39 11 12 31.3 2 243 -36 - 2 22 56 - 0 20 3 - 2 28 37 - 0 14 19 -0.26 137 0 0 - 0 50 46 11 12 31.3 1 243 -37 - 1 52 13 0 11 1 - 1 57 54 0 16 46 -0.24 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6739-00692-1 * constellation : Hydra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 15 09.1171 DE: -27 16 26.695 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 15 09.1170 DE: -27 16 26.694 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.300) * V mag [mag]: 11.2 * B mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (375) Ursula asteroid class: approx. diameter [km]: 195 approx. diameter ["]: 0.073 distance from Earth [AU]: 3.67500 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#89 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): 0.015", 0.002", 116.986° remarks: * orbital elements for (375)Ursula : Mean anomaly = 288.5500888700 deg Arg. of pericenter = 341.4883214329 deg Long. of node = 336.3962208891 deg Inclination = 15.9386430809 deg Eccentricity = 0.1026170920 Semimajor axis = 3.1278474852 AU Perihelion dist = 2.8068768719 AU Mag: H = 7.53, G = 0.27 Epoch of elements : MJD 60572.46514638 TDT (2024 Sep 19.4651) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#892023Apr24,5.16,2024,9,19,11.163513,0.068762,0.247976,20.603740,-5.747591,0.003443,-0.002213,-0.000001,0.000000 47.8351,-27.3889,10.95,1.19,False TYC 6739-00692-1,14.25253256,-27.2740823,11.40,11.16,11.03,0.0,0,,14.27586105,-27.3889366,2.51,2.22,0,0,0 375,Ursula,13.56,195.372,3.6750,0,0,3.702,-13.75,,22.6,0 0,288.4672,2024,9,19,341.4883,336.3962,15.9386,0.10262,3.12785,2.80688,7.52,5.0,0.15 1.046,0.0147,0.0018,117,0.0034,Known errors,0.94,0,-1,-1 20240919_0692-1,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org