IOTA/IOTA-ES occultation update for (375) Ursula / TYC 1406-00791-1 event on 2023 Feb 24, 04:19 UT Visible from South America Summary ------- On 2023 Feb 24 UT, the 195.3 km diameter asteroid (375) Ursula will occult a 10.3 mag star in the constellation Leo for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.47 mag to 12.61 mag (the magnitude of the asteroid) for at most 12.850 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: 2023 Feb 24, 04:13 - 2023 Feb 24, 04:24 * geocentric midpoint of event [JD]: 2459999.67991025 * magnitude of target star: 10.26 * magnitude drop [mag]: 2.47 * estimated maximum duration [s]: 12.850 * Moon: 20 % sunlit, 112° distance * Sun: 163° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 262 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.023", 0.003", 125°) * approx speed of asteroid's shadow [km/s]: 15.1943 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1406-00791-1 by 375 Ursula on 2023 Feb 24 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 -150 0 0 -38 14 2 4 24 16.8 0 65 4 -36 55 43 .. .. .. -36 36 55 .. .. .. .... -149 0 0 -37 51 32 4 24 16.7 1 64 3 -36 33 19 -39 11 32 -36 14 33 -39 31 18 0.24 -148 0 0 -37 29 6 4 24 16.5 2 63 2 -36 11 0 -38 48 59 -35 52 15 -39 8 42 0.57 -147 0 0 -37 6 44 4 24 16.2 3 63 1 -35 48 46 -38 26 30 -35 30 3 -38 46 12 0.68 -146 0 0 -36 44 29 4 24 15.7 4 62 0 -35 26 38 -38 4 6 -35 7 57 -38 23 46 0.74 -145 0 0 -36 22 20 4 24 15.2 4 62 -1 -35 4 37 -37 41 49 -34 45 57 -38 1 26 0.77 -144 0 0 -36 0 17 4 24 14.4 5 61 -1 -34 42 42 -37 19 38 -34 24 5 -37 39 13 0.80 -143 0 0 -35 38 22 4 24 13.6 6 60 -2 -34 20 55 -36 57 35 -34 2 20 -37 17 8 0.81 -142 0 0 -35 16 36 4 24 12.6 7 60 -3 -33 59 17 -36 35 39 -33 40 43 -36 55 10 0.82 -141 0 0 -34 54 57 4 24 11.5 8 59 -4 -33 37 47 -36 13 52 -33 19 15 -36 33 20 0.83 -140 0 0 -34 33 29 4 24 10.2 9 59 -5 -33 16 27 -35 52 14 -32 57 57 -36 11 40 0.84 -139 0 0 -34 12 10 4 24 8.8 10 58 -6 -32 55 17 -35 30 46 -32 36 49 -35 50 9 0.85 -138 0 0 -33 51 1 4 24 7.2 11 58 -7 -32 34 17 -35 9 28 -32 15 52 -35 28 49 0.85 -137 0 0 -33 30 4 4 24 5.6 11 57 -8 -32 13 29 -34 48 21 -31 55 5 -35 7 40 0.86 -136 0 0 -33 9 18 4 24 3.7 12 56 -8 -31 52 52 -34 27 25 -31 34 31 -34 46 42 0.86 -135 0 0 -32 48 44 4 24 1.8 13 56 -9 -31 32 27 -34 6 42 -31 14 8 -34 25 56 0.86 -134 0 0 -32 28 23 4 23 59.7 14 55 -10 -31 12 15 -33 46 11 -30 53 58 -34 5 22 0.87 -133 0 0 -32 8 15 4 23 57.5 15 55 -11 -30 52 17 -33 25 53 -30 34 2 -33 45 2 0.87 -132 0 0 -31 48 21 4 23 55.1 16 54 -12 -30 32 32 -33 5 49 -30 14 19 -33 24 55 0.87 -131 0 0 -31 28 41 4 23 52.6 17 53 -13 -30 13 1 -32 45 59 -29 54 51 -33 5 3 0.87 -130 0 0 -31 9 15 4 23 50.0 18 53 -14 -29 53 45 -32 26 23 -29 35 37 -32 45 25 0.88 -129 0 0 -30 50 5 4 23 47.3 18 52 -15 -29 34 44 -32 7 3 -29 16 38 -32 26 2 0.88 -128 0 0 -30 31 10 4 23 44.4 19 52 -16 -29 15 59 -31 47 58 -28 57 55 -32 6 55 0.88 -127 0 0 -30 12 32 4 23 41.4 20 51 -17 -28 57 30 -31 29 10 -28 39 28 -31 48 4 0.88 -126 0 0 -29 54 10 4 23 38.2 21 50 -17 -28 39 17 -31 10 37 -28 21 17 -31 29 29 0.88 -125 0 0 -29 36 4 4 23 35.0 22 50 -18 -28 21 21 -30 52 22 -28 3 23 -31 11 11 0.88 -124 0 0 -29 18 16 4 23 31.6 23 49 -19 -28 3 42 -30 34 24 -27 45 47 -30 53 11 0.88 -123 0 0 -29 0 46 4 23 28.1 24 49 -20 -27 46 21 -30 16 44 -27 28 28 -30 35 28 0.88 -122 0 0 -28 43 34 4 23 24.5 24 48 -21 -27 29 18 -29 59 23 -27 11 27 -30 18 4 0.88 -121 0 0 -28 26 40 4 23 20.7 25 47 -22 -27 12 33 -29 42 19 -26 54 44 -30 0 58 0.88 -120 0 0 -28 10 5 4 23 16.8 26 47 -23 -26 56 7 -29 25 35 -26 38 20 -29 44 11 0.89 -119 0 0 -27 53 49 4 23 12.9 27 46 -24 -26 40 0 -29 9 10 -26 22 15 -29 27 44 0.89 -118 0 0 -27 37 53 4 23 8.8 28 45 -25 -26 24 12 -28 53 4 -26 6 30 -29 11 36 0.89 -117 0 0 -27 22 17 4 23 4.6 28 45 -26 -26 8 45 -28 37 18 -25 51 4 -28 55 48 0.89 -116 0 0 -27 7 0 4 23 0.2 29 44 -27 -25 53 37 -28 21 53 -25 35 58 -28 40 20 0.89 -115 0 0 -26 52 4 4 22 55.8 30 43 -27 -25 38 49 -28 6 48 -25 21 12 -28 25 13 0.89 -114 0 0 -26 37 29 4 22 51.3 31 43 -28 -25 24 22 -27 52 4 -25 6 47 -28 10 27 0.89 -113 0 0 -26 23 15 4 22 46.7 32 42 -29 -25 10 16 -27 37 41 -24 52 43 -27 56 2 0.89 -112 0 0 -26 9 22 4 22 41.9 32 41 -30 -24 56 31 -27 23 40 -24 39 0 -27 41 59 0.89 -111 0 0 -25 55 50 4 22 37.1 33 40 -31 -24 43 7 -27 10 0 -24 25 38 -27 28 17 0.89 -110 0 0 -25 42 40 4 22 32.2 34 39 -32 -24 30 5 -26 56 42 -24 12 37 -27 14 57 0.89 -109 0 0 -25 29 53 4 22 27.2 35 39 -33 -24 17 24 -26 43 47 -23 59 59 -27 1 59 0.89 -108 0 0 -25 17 27 4 22 22.0 35 38 -34 -24 5 6 -26 31 13 -23 47 42 -26 49 24 0.89 -107 0 0 -25 5 24 4 22 16.8 36 37 -34 -23 53 10 -26 19 3 -23 35 48 -26 37 11 0.89 -106 0 0 -24 53 43 4 22 11.6 37 36 -35 -23 41 36 -26 7 15 -23 24 15 -26 25 22 0.89 -105 0 0 -24 42 25 4 22 6.2 37 35 -36 -23 30 25 -25 55 50 -23 13 6 -26 13 55 0.89 -104 0 0 -24 31 31 4 22 0.8 38 34 -37 -23 19 37 -25 44 48 -23 2 19 -26 2 52 0.89 -103 0 0 -24 20 59 4 21 55.2 39 34 -38 -23 9 11 -25 34 10 -22 51 55 -25 52 12 0.89 -102 0 0 -24 10 51 4 21 49.6 39 33 -39 -22 59 9 -25 23 55 -22 41 54 -25 41 55 0.89 -101 0 0 -24 1 6 4 21 44.0 40 32 -39 -22 49 30 -25 14 4 -22 32 17 -25 32 3 0.89 -100 0 0 -23 51 44 4 21 38.2 40 31 -40 -22 40 14 -25 4 37 -22 23 2 -25 22 34 0.89 - 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Uncertainty in time = +/- 3 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: TYC 1406-00791-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 32 52.7155 DE: +19 50 29.802 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 32 52.7155 DE: +19 50 29.802 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (375) Ursula asteroid class: approx. diameter [km]: 195 approx. diameter ["]: 0.108 distance from Earth [AU]: 2.48740 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#88 date of fit: 2023 Feb 07 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): 0.023", 0.003", 125.098° remarks: * orbital elements for (375)Ursula : Mean anomaly = 186.3130721820 deg Arg. of pericenter = 341.5743595859 deg Long. of node = 336.4098512979 deg Inclination = 15.9445846587 deg Eccentricity = 0.1031466815 Semimajor axis = 3.1264778368 AU Perihelion dist = 2.8039920233 AU Mag: H = 7.51, G = 0.27 Epoch of elements : MJD 59999.17986111 TDT (2023 Feb 24.1799) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#882023Feb07,12.85,2023,2,24,4.317846,-0.010444,-0.665809,-8.574982,0.136337,0.001420,-0.001016,0.000001,0.000000 -75.0114,19.7386,118.55,-9.57,False TYC 1406-00791-1,9.54797654,19.8416115,0.00,10.26,0.00,0.0,0,,9.56983832,19.7386223,2.47,0.00,0,0,0 375,Ursula,12.61,195.3,2.4874,0,0,-2.147,0.48,,22.6,0 0,186.2810,2023,2,24,341.5744,336.4099,15.9446,0.10315,3.12648,2.80399,7.54,5.0,0.15 1.122,0.0230,0.0030,125,0.0132,Known errors,-1.00,-1,-1,-1 20230224_0791-1,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org