IOTA/IOTA-ES occultation update for (42) Isis / UCAC4 294-199657 event on 2024 Sep 19, 23:51 UT Visible from Summary ------- On 2024 Sep 19 UT, the 113.021 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 0.42 mag to 11.13 mag (the magnitude of the asteroid) for at most 7.900 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, 23:43 - 2024 Sep 19, 23:58 * geocentric midpoint of event [JD]: 2460573.49381287 * magnitude of target star: 11.93 * magnitude drop [mag]: 0.42 * estimated maximum duration [s]: 7.900 * Moon: 94 % sunlit, 106° distance * Sun: 101° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 119 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.001", 99°) * approx speed of asteroid's shadow [km/s]: 14.2986 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 294-199657 by 42 Isis 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 -158 0 0 .. .. .... .. .. .. .. .. .. 11 18 41 .. .. .. 11 14 11 .. .. .. .... -157 0 0 11 19 27 23 44 0.2 1 122 67 10 41 51 11 57 13 10 37 22 12 1 44 .... -156 0 0 10 42 42 23 44 0.5 2 122 66 10 5 9 11 20 24 10 0 41 11 24 55 -0.13 -155 0 0 10 6 7 23 44 0.9 3 123 66 9 28 38 10 43 44 9 24 9 10 48 15 -0.19 -154 0 0 9 29 42 23 44 1.5 4 123 65 8 52 17 10 7 15 8 47 49 10 11 45 -0.22 -153 0 0 8 53 28 23 44 2.4 6 123 64 8 16 7 9 30 57 8 11 40 9 35 27 -0.24 -152 0 0 8 17 28 23 44 3.4 7 123 63 7 40 11 8 54 52 7 35 45 8 59 21 -0.25 -151 0 0 7 41 41 23 44 4.6 8 123 63 7 4 30 8 19 1 7 0 4 8 23 29 -0.26 -150 0 0 7 6 10 23 44 6.0 9 123 62 6 29 3 7 43 24 6 24 38 7 47 52 -0.26 -149 0 0 6 30 54 23 44 7.5 10 123 61 5 53 53 7 8 4 5 49 28 7 12 31 -0.27 -148 0 0 5 55 57 23 44 9.3 11 124 60 5 19 1 6 33 1 5 14 36 6 37 27 -0.27 -147 0 0 5 21 17 23 44 11.3 13 124 59 4 44 27 5 58 16 4 40 3 6 2 42 -0.27 -146 0 0 4 46 57 23 44 13.4 14 124 58 4 10 12 5 23 50 4 5 49 5 28 15 -0.28 -145 0 0 4 12 57 23 44 15.7 15 124 57 3 36 18 4 49 45 3 31 56 4 54 9 -0.28 -144 0 0 3 39 19 23 44 18.2 16 124 56 3 2 45 4 16 0 2 58 24 4 20 24 -0.28 -143 0 0 3 6 3 23 44 20.9 17 124 55 2 29 35 3 42 38 2 25 14 3 47 1 -0.28 -142 0 0 2 33 10 23 44 23.8 18 124 54 1 56 48 3 9 39 1 52 28 3 14 1 -0.28 -141 0 0 2 0 41 23 44 26.8 19 124 53 1 24 25 2 37 4 1 20 6 2 41 25 -0.28 -140 0 0 1 28 36 23 44 30.0 21 124 52 0 52 27 2 4 53 0 48 8 2 9 14 -0.29 -139 0 0 0 56 58 23 44 33.3 22 124 51 0 20 55 1 33 8 0 16 37 1 37 28 -0.29 -138 0 0 0 25 45 23 44 36.8 23 124 50 - 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 294-199657 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 39 26.6240 DE: -31 15 33.106 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 39 26.6239 DE: -31 15 33.106 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.2 * 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 ["]: 0.108 distance from Earth [AU]: 1.43770 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): 0.029", 0.001", 98.996° remarks: * orbital elements for (42)Isis : Mean anomaly = 352.9617454651 deg Arg. of pericenter = 237.2545796738 deg Long. of node = 84.1660134246 deg Inclination = 8.5112322100 deg Eccentricity = 0.2219993198 Semimajor axis = 2.4426069435 AU Perihelion dist = 1.9003498634 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 60572.99381279 TDT (2024 Sep 19.9938) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Apr24,7.90,2024,9,19,23.851509,-0.019700,0.300968,8.053180,0.528861,0.004942,0.000496,0.000000,0.000000 -76.8832,-31.2386,-179.41,0.98,False UCAC4 294-199657,18.65739560,-31.2591961,12.20,11.93,11.78,0.0,0,,18.68404540,-31.2385625,0.43,0.34,0,0,0 42,Isis,11.13,113.021,1.4377,0,0,3.841,3.24,,6.0,0 0,352.7052,2024,9,19,237.2546,84.1660,8.5112,0.22200,2.44261,1.90035,7.61,5.0,0.15 1.060,0.0287,0.0014,99,0.0065,Known errors,0.83,0,-1,-1 20240919_199657,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org