IOTA/IOTA-ES occultation update for (42) Isis / UCAC4 329-172794 event on 2024 Jun 06, 13:19 UT Visible from Summary ------- On 2024 Jun 06 UT, the 112.967627221813 km diameter asteroid (42) Isis will occult a 11.5 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 0.26 mag to 10.06 mag (the magnitude of the asteroid) for at most 20.360 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 Jun 06, 12:59 - 2024 Jun 06, 13:38 * geocentric midpoint of event [JD]: 2460468.05493609 * magnitude of target star: 11.50 * magnitude drop [mag]: 0.26 * estimated maximum duration [s]: 20.360 * Moon: 0 % sunlit, 155° distance * Sun: 155° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 115 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.039, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.039", 0.003", 93°) * approx speed of asteroid's shadow [km/s]: 5.5533 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 329-172794 by 42 Isis on 2024 Jun 6 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 77 0 0 -31 3 0 13 37 57.3 0 119 -21 .. .. .. -31 38 29 .. .. .. -31 52 22 .... 78 0 0 -31 30 37 13 37 57.0 1 118 -22 -30 55 17 -32 5 52 -30 41 25 -32 19 39 0.00 79 0 0 -31 57 17 13 37 56.5 2 118 -23 -31 22 11 -32 32 18 -31 8 25 -32 45 59 -0.10 80 0 0 -32 23 1 13 37 55.6 3 117 -24 -31 48 9 -32 57 48 -31 34 28 -33 11 24 -0.13 81 0 0 -32 47 51 13 37 54.5 4 116 -25 -32 13 12 -33 22 24 -31 59 36 -33 35 55 -0.15 82 0 0 -33 11 46 13 37 53.0 5 116 -26 -32 37 20 -33 46 7 -32 23 50 -33 59 33 -0.16 83 0 0 -33 34 49 13 37 51.3 6 115 -27 -33 0 35 -34 8 57 -32 47 10 -34 22 18 -0.17 84 0 0 -33 57 0 13 37 49.3 7 115 -27 -33 22 58 -34 30 56 -33 9 37 -34 44 13 -0.17 85 0 0 -34 18 20 13 37 47.0 8 114 -28 -33 44 30 -34 52 5 -33 31 14 -35 5 17 -0.17 86 0 0 -34 38 51 13 37 44.5 8 114 -29 -34 5 12 -35 12 25 -33 52 0 -35 25 33 -0.18 87 0 0 -34 58 32 13 37 41.7 9 113 -30 -34 25 4 -35 31 56 -34 11 57 -35 45 0 -0.18 88 0 0 -35 17 26 13 37 38.7 10 113 -31 -34 44 9 -35 50 40 -34 31 5 -36 3 39 -0.18 89 0 0 -35 35 33 13 37 35.5 11 112 -32 -35 2 25 -36 8 37 -34 49 25 -36 21 33 -0.18 90 0 0 -35 52 54 13 37 32.0 12 111 -33 -35 19 55 -36 25 48 -35 6 59 -36 38 41 -0.18 91 0 0 -36 9 29 13 37 28.4 13 111 -33 -35 36 40 -36 42 15 -35 23 47 -36 55 3 -0.18 92 0 0 -36 25 20 13 37 24.5 14 110 -34 -35 52 39 -36 57 57 -35 39 50 -37 10 42 -0.18 93 0 0 -36 40 27 13 37 20.4 14 110 -35 -36 7 54 -37 12 55 -35 55 8 -37 25 38 -0.18 94 0 0 -36 54 50 13 37 16.1 15 109 -36 -36 22 26 -37 27 11 -36 9 43 -37 39 51 -0.18 95 0 0 -37 8 31 13 37 11.6 16 109 -37 -36 36 14 -37 40 45 -36 23 34 -37 53 21 -0.18 96 0 0 -37 21 31 13 37 6.9 17 108 -37 -36 49 20 -37 53 37 -36 36 43 -38 6 11 -0.18 97 0 0 -37 33 49 13 37 2.1 18 107 -38 -37 1 45 -38 5 48 -36 49 11 -38 18 20 -0.18 98 0 0 -37 45 26 13 36 57.0 18 107 -39 -37 13 29 -38 17 19 -37 0 57 -38 29 48 -0.18 99 0 0 -37 56 23 13 36 51.8 19 106 -40 -37 24 32 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Uncertainty in time = +/- 5 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: UCAC4 329-172794 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 48 27.8528 DE: -24 19 16.251 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 48 27.8528 DE: -24 19 16.251 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.5 * B mag [mag]: 12.3 * 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 ["]: 0.144 distance from Earth [AU]: 1.08060 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): 0.039", 0.003", 92.8° remarks: * orbital elements for (42)Isis : Mean anomaly = 325.7472796281 deg Arg. of pericenter = 237.2496127637 deg Long. of node = 84.1658662240 deg Inclination = 8.5111716179 deg Eccentricity = 0.2220597836 Semimajor axis = 2.4427994833 AU Perihelion dist = 1.9003519586 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 60467.55493713 TDT (2024 Jun 06.5549) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Apr24,20.36,2024,6,6,13.318466,-0.117309,0.121613,-2.255896,-2.176159,-0.002190,-0.000081,0.000001,0.000000 -172.7286,-24.2941,-20.07,22.74,False UCAC4 329-172794,18.80773688,-24.3211808,12.29,11.50,11.07,0.1,0,,18.83290310,-24.2940601,0.26,0.25,0,0,0 42,Isis,10.06,113.046,1.0806,0,0,-1.343,-17.71,,6.0,0 0,325.6040,2024,6,6,237.2496,84.1659,8.5112,0.22206,2.44280,1.90035,7.61,5.0,0.15 1.196,0.0387,0.0029,93,0.0282,Known errors,0.95,0,-1,-1 20240606_172794,60139.37 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 08:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org