IOTA/IOTA-ES occultation update for (42) Isis / UCAC4 305-275764 event on 2024 Oct 27, 12:24 UT Visible from Summary ------- On 2024 Oct 27 UT, the 113.058 km diameter asteroid (42) Isis will occult a 11.9 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 0.62 mag to 11.61 mag (the magnitude of the asteroid) for at most 4.330 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 Oct 27, 12:21 - 2024 Oct 27, 12:28 * geocentric midpoint of event [JD]: 2460611.01708950 * magnitude of target star: 11.89 * magnitude drop [mag]: 0.62 * estimated maximum duration [s]: 4.330 * Moon: 21 % sunlit, 135° distance * Sun: 80° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 132 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.001", 89°) * approx speed of asteroid's shadow [km/s]: 26.1078 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 305-275764 by 42 Isis on 2024 Oct 27 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 - 38 0 0 -36 53 40 12 21 7.0 0 127 55 -37 38 52 .. .. .. -37 44 13 .. .. .. .... - 37 0 0 -37 30 10 12 21 7.1 1 127 55 -38 15 21 -36 45 25 -38 20 42 -36 40 10 0.52 - 36 0 0 -38 6 22 12 21 7.2 2 126 56 -38 51 32 -37 21 37 -38 56 53 -37 16 23 0.57 - 35 0 0 -38 42 14 12 21 7.4 3 125 56 -39 27 24 -37 57 31 -39 32 45 -37 52 17 0.58 - 34 0 0 -39 17 47 12 21 7.7 4 125 56 -40 2 55 -38 33 5 -40 8 16 -38 27 51 0.59 - 33 0 0 -39 52 59 12 21 8.1 5 124 56 -40 38 5 -39 8 19 -40 43 25 -39 3 5 0.59 - 32 0 0 -40 27 48 12 21 8.6 6 123 56 -41 12 51 -39 43 10 -41 18 11 -39 37 57 0.59 - 31 0 0 -41 2 14 12 21 9.1 7 123 56 -41 47 15 -40 17 40 -41 52 34 -40 12 27 0.60 - 30 0 0 -41 36 16 12 21 9.7 8 122 56 -42 21 13 -40 51 45 -42 26 32 -40 46 33 0.60 - 29 0 0 -42 9 54 12 21 10.4 9 121 56 -42 54 47 -41 25 26 -43 0 5 -41 20 14 0.60 - 28 0 0 -42 43 5 12 21 11.1 10 121 56 -43 27 54 -41 58 43 -43 33 12 -41 53 31 0.60 - 27 0 0 -43 15 51 12 21 11.9 11 120 56 -44 0 34 -42 31 33 -44 5 52 -42 26 21 0.60 - 26 0 0 -43 48 9 12 21 12.8 11 119 56 -44 32 47 -43 3 56 -44 38 4 -42 58 45 0.60 - 25 0 0 -44 19 59 12 21 13.7 12 119 56 -45 4 32 -43 35 52 -45 9 48 -43 30 42 0.60 - 24 0 0 -44 51 21 12 21 14.7 13 118 56 -45 35 48 -44 7 20 -45 41 3 -44 2 11 0.60 - 23 0 0 -45 22 15 12 21 15.8 14 117 56 -46 6 35 -44 38 20 -46 11 49 -44 33 11 0.60 - 22 0 0 -45 52 39 12 21 16.8 15 116 56 -46 36 52 -45 8 51 -46 42 6 -45 3 43 0.60 - 21 0 0 -46 22 33 12 21 18.0 16 116 55 -47 6 39 -45 38 52 -47 11 52 -45 33 45 0.60 - 20 0 0 -46 51 58 12 21 19.2 17 115 55 -47 35 56 -46 8 24 -47 41 8 -46 3 18 0.60 - 19 0 0 -47 20 51 12 21 20.4 17 114 55 -48 4 42 -46 37 25 -48 9 53 -46 32 20 0.60 - 18 0 0 -47 49 15 12 21 21.7 18 113 55 -48 32 57 -47 5 56 -48 38 7 -47 0 52 0.60 - 17 0 0 -48 17 7 12 21 23.0 19 112 54 -49 0 41 -47 33 57 -49 5 50 -47 28 54 0.60 - 16 0 0 -48 44 28 12 21 24.3 20 112 54 -49 27 53 -48 1 27 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5.1 5 241 -58 -19 43 43 -18 19 0 -19 48 45 -18 14 3 0.71 170 0 0 -18 25 30 12 28 5.6 4 241 -59 -19 7 53 -17 43 30 -19 12 54 -17 38 35 0.73 171 0 0 -17 50 14 12 28 6.0 3 241 -59 -18 32 26 -17 8 23 -18 37 26 -17 3 29 0.78 172 0 0 -17 15 21 12 28 6.2 2 240 -60 -17 57 23 -16 33 40 -18 2 21 -16 28 47 0.87 173 0 0 -16 40 53 12 28 6.4 1 240 -60 -17 22 45 -15 59 22 -17 27 42 -15 54 31 1.19 174 0 0 .. .. .... .. .. .. .. .. .. -16 48 33 .. .. .. -16 53 28 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 305-275764 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 50 27.9911 DE: -29 02 19.042 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 50 27.9910 DE: -29 02 19.043 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (42) Isis asteroid class: Barbarian approx. diameter [km]: 113 approx. diameter ["]: 0.086 distance from Earth [AU]: 1.80240 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): 0.025", 0.001", 89.217° remarks: * orbital elements for (42)Isis : Mean anomaly = 2.6481521774 deg Arg. of pericenter = 237.2568575179 deg Long. of node = 84.1661186520 deg Inclination = 8.5112435586 deg Eccentricity = 0.2219761794 Semimajor axis = 2.4425334641 AU Perihelion dist = 1.9003492176 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 60610.51708921 TDT (2024 Oct 27.5171) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Apr24,4.33,2024,10,27,12.410148,0.108621,-0.499916,14.398711,3.134744,0.005102,0.000853,0.000000,0.000000 75.4932,-28.9775,-10.20,-13.05,False UCAC4 305-275764,19.84110868,-29.0386228,12.63,11.89,11.49,0.0,0,,19.86674929,-28.9775499,0.62,0.60,0,0,0 42,Isis,11.61,113.058,1.8024,0,0,5.354,15.30,,6.0,0 0,2.5146,2024,10,27,237.2569,84.1661,8.5112,0.22198,2.44253,1.90035,7.61,5.0,0.15 1.059,0.0250,0.0010,89,0.0051,Known errors,1.50,0,-1,-1 20241027_275764,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org