IOTA/IOTA-ES occultation update for (42) Isis / UCAC4 323-219411 event on 2024 Nov 23, 17:16 UT Visible from Summary ------- On 2024 Nov 23 UT, the 113.048 km diameter asteroid (42) Isis will occult a 11.6 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.89 mag to 11.85 mag (the magnitude of the asteroid) for at most 3.370 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 Nov 23, 17:13 - 2024 Nov 23, 17:19 * geocentric midpoint of event [JD]: 2460638.21975562 * magnitude of target star: 11.59 * magnitude drop [mag]: 0.89 * estimated maximum duration [s]: 3.370 * Moon: 44 % sunlit, 149° distance * Sun: 67° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 127 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.023", 0.001", 81°) * approx speed of asteroid's shadow [km/s]: 33.5801 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 323-219411 by 42 Isis on 2024 Nov 23 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 -122 0 0 .. .. .... .. .. .. .. .. .. -40 29 15 .. .. .. -40 33 29 .. .. .. .... -121 0 0 -40 18 24 17 13 38.5 1 123 51 -41 0 8 -39 37 0 -41 4 21 -39 32 50 .... -120 0 0 -40 48 57 17 13 38.6 2 123 52 -41 30 35 -40 7 37 -41 34 48 -40 3 28 0.50 -119 0 0 -41 19 3 17 13 38.7 2 122 52 -42 0 35 -40 37 49 -42 4 48 -40 33 40 0.51 -118 0 0 -41 48 43 17 13 38.9 3 121 53 -42 30 10 -41 7 35 -42 34 22 -41 3 26 0.51 -117 0 0 -42 17 56 17 13 39.1 4 121 53 -42 59 17 -41 36 54 -43 3 28 -41 32 46 0.51 -116 0 0 -42 46 42 17 13 39.4 5 120 54 -43 27 56 -42 5 46 -43 32 7 -42 1 39 0.52 -115 0 0 -43 15 0 17 13 39.7 6 119 54 -43 56 8 -42 34 10 -44 0 18 -42 30 4 0.52 -114 0 0 -43 42 51 17 13 40.1 7 119 55 -44 23 52 -43 2 7 -44 28 1 -42 58 2 0.52 -113 0 0 -44 10 13 17 13 40.5 8 118 55 -44 51 7 -43 29 36 -44 55 16 -43 25 31 0.52 -112 0 0 -44 37 7 17 13 40.9 9 117 55 -45 17 54 -43 56 37 -45 22 2 -43 52 33 0.52 -111 0 0 -45 3 32 17 13 41.4 9 117 56 -45 44 12 -44 23 10 -45 48 19 -44 19 6 0.52 -110 0 0 -45 29 28 17 13 42.0 10 116 56 -46 10 0 -44 49 14 -46 14 7 -44 45 11 0.52 -109 0 0 -45 54 56 17 13 42.5 11 115 56 -46 35 20 -45 14 49 -46 39 26 -45 10 47 0.52 -108 0 0 -46 19 55 17 13 43.1 12 114 56 -47 0 11 -45 39 55 -47 4 16 -45 35 54 0.52 -107 0 0 -46 44 24 17 13 43.8 13 114 57 -47 24 33 -46 4 32 -47 28 37 -46 0 32 0.52 -106 0 0 -47 8 25 17 13 44.4 13 113 57 -47 48 25 -46 28 41 -47 52 29 -46 24 41 0.52 -105 0 0 -47 31 56 17 13 45.2 14 112 57 -48 11 49 -46 52 20 -48 15 51 -46 48 21 0.52 -104 0 0 -47 54 59 17 13 45.9 15 111 57 -48 34 43 -47 15 31 -48 38 45 -47 11 33 0.52 -103 0 0 -48 17 32 17 13 46.7 16 111 57 -48 57 8 -47 38 12 -49 1 9 -47 34 15 0.52 -102 0 0 -48 39 37 17 13 47.4 16 110 58 -49 19 4 -48 0 25 -49 23 4 -47 56 28 0.52 -101 0 0 -49 1 12 17 13 48.3 17 109 58 -49 40 31 -48 22 9 -49 44 30 -48 18 13 0.52 -100 0 0 -49 22 19 17 13 49.1 18 108 58 -50 1 30 -48 43 24 -50 5 28 -48 39 29 0.52 - 99 0 0 -49 42 57 17 13 50.0 19 107 58 -50 22 0 -49 4 11 -50 25 57 -49 0 17 0.52 - 98 0 0 -50 3 7 17 13 50.9 19 107 58 -50 42 1 -49 24 29 -50 45 57 -49 20 35 0.52 - 97 0 0 -50 22 49 17 13 51.8 20 106 58 -51 1 34 -49 44 19 -51 5 30 -49 40 26 0.52 - 96 0 0 -50 42 2 17 13 52.7 21 105 58 -51 20 39 -50 3 40 -51 24 34 -49 59 49 0.52 - 95 0 0 -51 0 48 17 13 53.7 22 104 58 -51 39 16 -50 22 34 -51 43 10 -50 18 43 0.52 - 94 0 0 -51 19 6 17 13 54.7 22 103 58 -51 57 26 -50 41 0 -52 1 19 -50 37 10 0.52 - 93 0 0 -51 36 56 17 13 55.7 23 102 58 -52 15 8 -50 58 59 -52 19 0 -50 55 10 0.52 - 92 0 0 -51 54 19 17 13 56.7 24 102 58 -52 32 22 -51 16 30 -52 36 14 -51 12 42 0.52 - 91 0 0 -52 11 15 17 13 57.7 24 101 58 -52 49 10 -51 33 34 -52 53 1 -51 29 46 0.52 - 90 0 0 -52 27 44 17 13 58.8 25 100 57 -53 5 31 -51 50 11 -53 9 21 -51 46 24 0.52 - 89 0 0 -52 43 47 17 13 59.8 26 99 57 -53 21 26 -52 6 22 -53 25 15 -52 2 36 0.52 - 88 0 0 -52 59 23 17 14 0.9 26 98 57 -53 36 54 -52 22 6 -53 40 42 -52 18 20 0.52 - 87 0 0 -53 14 33 17 14 2.0 27 97 57 -53 51 56 -52 37 24 -53 55 44 -52 33 39 0.52 - 86 0 0 -53 29 18 17 14 3.1 27 96 57 -54 6 33 -52 52 16 -54 10 20 -52 48 32 0.52 - 85 0 0 -53 43 36 17 14 4.2 28 95 57 -54 20 44 -53 6 42 -54 24 30 -53 2 59 0.52 - 84 0 0 -53 57 30 17 14 5.4 29 95 57 -54 34 30 -53 20 43 -54 38 15 -53 17 1 0.52 - 83 0 0 -54 10 58 17 14 6.5 29 94 56 -54 47 51 -53 34 18 -54 51 35 -53 30 37 0.52 - 82 0 0 -54 24 2 17 14 7.7 30 93 56 -55 0 48 -53 47 29 -55 4 31 -53 43 48 0.52 - 81 0 0 -54 36 41 17 14 8.8 30 92 56 -55 13 20 -54 0 15 -55 17 2 -53 56 35 0.52 - 80 0 0 -54 48 56 17 14 10.0 31 91 56 -55 25 27 -54 12 37 -55 29 9 -54 8 57 0.52 - 79 0 0 -55 0 47 17 14 11.2 32 90 55 -55 37 11 -54 24 34 -55 40 53 -54 20 55 0.52 - 78 0 0 -55 12 13 17 14 12.4 32 89 55 -55 48 32 -54 36 8 -55 52 12 -54 32 30 0.52 - 77 0 0 -55 23 17 17 14 13.6 33 88 55 -55 59 29 -54 47 17 -56 3 9 -54 43 40 0.52 - 76 0 0 -55 33 57 17 14 14.9 33 87 55 -56 10 2 -54 58 4 -56 13 42 -54 54 27 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8 10 -16 32 48 -15 4 8 0.56 72 0 0 -15 14 2 17 19 9.6 14 247 -47 -15 54 18 -14 34 3 -15 58 23 -14 30 1 0.56 73 0 0 -14 40 8 17 19 10.5 12 247 -48 -15 20 16 -14 0 16 -15 24 20 -13 56 16 0.56 74 0 0 -14 6 35 17 19 11.4 11 246 -49 -14 46 35 -13 26 52 -14 50 38 -13 22 52 0.57 75 0 0 -13 33 26 17 19 12.2 10 246 -50 -14 13 18 -12 53 51 -14 17 20 -12 49 52 0.57 76 0 0 -13 0 41 17 19 12.9 9 246 -51 -13 40 24 -12 21 14 -13 44 26 -12 17 16 0.58 77 0 0 -12 28 21 17 19 13.5 8 246 -52 -13 7 56 -11 49 2 -13 11 56 -11 45 5 0.58 78 0 0 -11 56 26 17 19 14.1 7 245 -53 -12 35 53 -11 17 16 -12 39 52 -11 13 20 0.59 79 0 0 -11 24 58 17 19 14.5 6 245 -54 -12 4 16 -10 45 56 -12 8 15 -10 42 0 0.60 80 0 0 -10 53 57 17 19 14.9 5 245 -55 -11 33 6 -10 15 3 -11 37 4 -10 11 8 0.62 81 0 0 -10 23 24 17 19 15.2 4 245 -55 -11 2 24 - 9 44 38 -11 6 22 - 9 40 44 0.65 82 0 0 - 9 53 19 17 19 15.4 2 245 -56 -10 32 11 - 9 14 42 -10 36 7 - 9 10 49 0.71 83 0 0 - 9 23 43 17 19 15.6 1 245 -57 -10 2 27 - 8 45 14 -10 6 22 - 8 41 22 0.85 84 0 0 - 8 54 37 17 19 15.6 0 244 -58 - 9 33 12 - 8 16 16 - 9 37 7 .. .. .. 2.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 323-219411 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 50 53.5977 DE: -25 27 04.684 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 50 53.5975 DE: -25 27 04.684 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.1 * 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 ["]: 0.075 distance from Earth [AU]: 2.07290 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): 0.023", 0.001", 81.345° remarks: * orbital elements for (42)Isis : Mean anomaly = 9.6709973560 deg Arg. of pericenter = 237.2585381499 deg Long. of node = 84.1662048757 deg Inclination = 8.5112489589 deg Eccentricity = 0.2219556650 Semimajor axis = 2.4424719393 AU Perihelion dist = 1.9003514557 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 60637.71975537 TDT (2024 Nov 23.7198) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Apr24,3.37,2024,11,23,17.274135,0.139237,-0.437514,18.058941,5.754320,0.004795,0.001081,-0.000001,0.000000 -9.1918,-25.3602,-82.46,-20.54,False UCAC4 323-219411,20.84822162,-25.4513010,12.05,11.59,11.34,0.0,0,,20.87256280,-25.3601934,0.89,0.78,0,0,0 42,Isis,11.85,113.048,2.0729,0,0,5.652,24.42,,6.0,0 0,9.4852,2024,11,23,237.2585,84.1662,8.5112,0.22196,2.44247,1.90035,7.61,5.0,0.15 1.050,0.0233,0.0010,81,0.0038,Known errors,1.14,0,-1,-1 20241123_219411,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org