IOTA/IOTA-ES occultation update for (42) Isis / UCAC4 298-157570 event on 2024 Aug 03, 05:15 UT Visible from Summary ------- On 2024 Aug 03 UT, the 112.983758644485 km diameter asteroid (42) Isis will occult a 11.8 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 0.22 mag to 10.19 mag (the magnitude of the asteroid) for at most 49.950 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 Aug 03, 04:30 - 2024 Aug 03, 06:00 * geocentric midpoint of event [JD]: 2460525.71908704 * magnitude of target star: 11.80 * magnitude drop [mag]: 0.22 * estimated maximum duration [s]: 49.950 * Moon: 2 % sunlit, 153° distance * Sun: 139° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 120 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.038, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.038", 0.002", 102°) * approx speed of asteroid's shadow [km/s]: 2.2633 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 298-157570 by 42 Isis on 2024 Aug 3 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 120 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -29 30 5 .. .. .. -29 49 40 .... 121 0 0 -29 25 38 5 59 44.6 1 125 35 -28 44 32 -30 6 26 -28 24 51 -30 25 46 .... 122 0 0 -30 0 59 5 59 43.3 2 124 34 -29 20 25 -30 41 16 -29 0 59 -31 0 22 -0.27 123 0 0 -30 34 52 5 59 41.0 3 124 33 -29 54 48 -31 14 40 -29 35 37 -31 33 32 -0.34 124 0 0 -31 7 21 5 59 37.8 4 123 32 -30 27 45 -31 46 41 -30 8 47 -32 5 19 -0.37 125 0 0 -31 38 27 5 59 33.8 5 123 32 -30 59 18 -32 17 21 -30 40 34 -32 35 47 -0.39 126 0 0 -32 8 16 5 59 29.0 6 122 31 -31 29 32 -32 46 44 -31 11 0 -33 4 59 -0.40 127 0 0 -32 36 48 5 59 23.5 7 122 30 -31 58 29 -33 14 53 -31 40 9 -33 32 57 -0.40 128 0 0 -33 4 8 5 59 17.2 8 121 29 -32 26 12 -33 41 51 -32 8 3 -33 59 44 -0.41 129 0 0 -33 30 18 5 59 10.3 9 121 28 -32 52 43 -34 7 39 -32 34 45 -34 25 22 -0.41 130 0 0 -33 55 19 5 59 2.7 10 120 27 -33 18 6 -34 32 20 -33 0 17 -34 49 54 -0.41 131 0 0 -34 19 15 5 58 54.5 10 120 26 -33 42 21 -34 55 57 -33 24 42 -35 13 22 -0.41 132 0 0 -34 42 7 5 58 45.8 11 119 26 -34 5 32 -35 18 31 -33 48 2 -35 35 47 -0.41 133 0 0 -35 3 58 5 58 36.4 12 119 25 -34 27 40 -35 40 4 -34 10 19 -35 57 12 -0.41 134 0 0 -35 24 49 5 58 26.6 13 118 24 -34 48 48 -36 0 39 -34 31 35 -36 17 39 -0.41 135 0 0 -35 44 41 5 58 16.2 14 118 23 -35 8 56 -36 20 16 -34 51 51 -36 37 9 -0.41 136 0 0 -36 3 38 5 58 5.4 15 117 22 -35 28 8 -36 38 57 -35 11 9 -36 55 43 -0.41 137 0 0 -36 21 39 5 57 54.0 16 117 22 -35 46 23 -36 56 45 -35 29 32 -37 13 24 -0.40 138 0 0 -36 38 47 5 57 42.2 16 116 21 -36 3 44 -37 13 39 -35 47 0 -37 30 12 -0.40 139 0 0 -36 55 2 5 57 30.0 17 115 20 -36 20 13 -37 29 42 -36 3 34 -37 46 9 -0.40 140 0 0 -37 10 27 5 57 17.4 18 115 19 -36 35 49 -37 44 55 -36 19 17 -38 1 16 -0.40 141 0 0 -37 25 2 5 57 4.3 19 114 19 -36 50 36 -37 59 18 -36 34 8 -38 15 35 -0.40 142 0 0 -37 38 48 5 56 50.8 19 114 18 -37 4 33 -38 12 54 -36 48 11 -38 29 5 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Uncertainty in time = +/- 13 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 298-157570 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 03 45.3769 DE: -30 24 12.844 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 03 45.3769 DE: -30 24 12.844 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.8 * B mag [mag]: 12.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (42) Isis asteroid class: Barbarian approx. diameter [km]: 113 approx. diameter ["]: 0.146 distance from Earth [AU]: 1.06500 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#120 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): 0.038", 0.002", 101.61° remarks: * orbital elements for (42)Isis : Mean anomaly = 340.6299763578 deg Arg. of pericenter = 237.2521558362 deg Long. of node = 84.1659305223 deg Inclination = 8.5112163757 deg Eccentricity = 0.2220261078 Semimajor axis = 2.4426949718 AU Perihelion dist = 1.9003529146 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 60525.21908792 TDT (2024 Aug 03.2191) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Apr24,49.95,2024,8,3,5.258089,-0.271027,0.199848,-0.758285,-1.028092,0.003255,0.000497,0.000001,0.000000 -119.8148,-30.4037,102.68,17.37,False UCAC4 298-157570,18.06260470,-30.4035678,12.85,11.80,11.23,0.1,0,,18.08926400,-30.4037145,0.22,0.25,0,0,2 42,Isis,10.19,113.061,1.0650,0,0,-0.482,-8.49,,6.0,0 0,340.5734,2024,8,3,237.2522,84.1659,8.5112,0.22203,2.44269,1.90035,7.61,5.0,0.15 1.238,0.0383,0.0024,102,0.0348,Known errors,0.72,0,-1,-1 20240803_157570,60140.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org