IOTA/IOTA-ES occultation update for (364) Isara / UCAC4 541-045431 event on 2024 Nov 23, 21:25 UT Visible from Summary ------- On 2024 Nov 23 UT, the 28.7084716807946 km diameter asteroid (364) Isara will occult a 11.1 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.98 mag to 12.91 mag (the magnitude of the asteroid) for at most 6.440 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 Nov 23, 21:03 - 2024 Nov 23, 21:46 * geocentric midpoint of event [JD]: 2460638.39248071 * magnitude of target star: 11.12 * magnitude drop [mag]: 1.98 * estimated maximum duration [s]: 6.440 * Moon: 42 % sunlit, 40° distance * Sun: 120° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.006", 92°) * approx speed of asteroid's shadow [km/s]: 4.4688 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 541-045431 by 364 Isara 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 29 0 0 -36 59 6 21 3 59.4 0 67 -32 -37 8 28 -36 49 45 -37 12 53 -36 45 20 .... 30 0 0 -36 38 36 21 3 59.6 1 67 -32 -36 47 59 -36 29 15 -36 52 25 -36 24 49 0.10 31 0 0 -36 17 50 21 4 0.1 2 66 -33 -36 27 14 -36 8 28 -36 31 40 -36 4 2 0.28 32 0 0 -35 56 48 21 4 1.1 3 65 -33 -36 6 12 -35 47 25 -36 10 39 -35 42 59 0.34 33 0 0 -35 35 30 21 4 2.4 4 65 -33 -35 44 54 -35 26 6 -35 49 21 -35 21 40 0.37 34 0 0 -35 13 55 21 4 4.2 5 64 -34 -35 23 21 -35 4 31 -35 27 48 -35 0 5 0.39 35 0 0 -34 52 6 21 4 6.3 5 64 -34 -35 1 32 -34 42 41 -35 5 59 -34 38 14 0.40 36 0 0 -34 30 1 21 4 8.9 6 63 -35 -34 39 27 -34 20 35 -34 43 55 -34 16 8 0.41 37 0 0 -34 7 41 21 4 11.9 7 62 -35 -34 17 8 -33 58 14 -34 21 36 -33 53 47 0.42 38 0 0 -33 45 6 21 4 15.3 8 62 -36 -33 54 33 -33 35 39 -33 59 2 -33 31 11 0.42 39 0 0 -33 22 17 21 4 19.1 9 61 -36 -33 31 45 -33 12 49 -33 36 13 -33 8 21 0.43 40 0 0 -32 59 13 21 4 23.4 10 61 -37 -33 8 42 -32 49 46 -33 13 11 -32 45 18 0.43 41 0 0 -32 35 57 21 4 28.2 11 60 -37 -32 45 26 -32 26 28 -32 49 55 -32 22 0 0.43 42 0 0 -32 12 27 21 4 33.4 12 60 -37 -32 21 56 -32 2 58 -32 26 26 -31 58 29 0.44 43 0 0 -31 48 44 21 4 39.0 13 59 -38 -31 58 14 -31 39 15 -32 2 44 -31 34 46 0.44 44 0 0 -31 24 49 21 4 45.2 14 58 -38 -31 34 19 -31 15 19 -31 38 49 -31 10 50 0.44 45 0 0 -31 0 42 21 4 51.8 15 58 -38 -31 10 13 -30 51 12 -31 14 43 -30 46 43 0.44 46 0 0 -30 36 23 21 4 58.9 16 57 -39 -30 45 55 -30 26 53 -30 50 25 -30 22 24 0.44 47 0 0 -30 11 54 21 5 6.5 17 57 -39 -30 21 26 -30 2 23 -30 25 56 -29 57 54 0.44 48 0 0 -29 47 14 21 5 14.6 18 56 -39 -29 56 46 -29 37 43 -30 1 17 -29 33 14 0.45 49 0 0 -29 22 25 21 5 23.2 19 56 -39 -29 31 57 -29 12 54 -29 36 28 -29 8 24 0.45 50 0 0 -28 57 26 21 5 32.3 20 55 -40 -29 6 59 -28 47 55 -29 11 30 -28 43 25 0.45 51 0 0 -28 32 19 21 5 41.9 21 55 -40 -28 41 52 -28 22 47 -28 46 22 -28 18 17 0.45 52 0 0 -28 7 3 21 5 52.0 22 54 -40 -28 16 36 -27 57 31 -28 21 7 -27 53 2 0.45 53 0 0 -27 41 41 21 6 2.6 23 53 -40 -27 51 14 -27 32 8 -27 55 45 -27 27 38 0.45 54 0 0 -27 16 11 21 6 13.8 24 53 -40 -27 25 44 -27 6 39 -27 30 15 -27 2 9 0.45 55 0 0 -26 50 35 21 6 25.4 25 52 -41 -27 0 8 -26 41 3 -27 4 39 -26 36 33 0.45 56 0 0 -26 24 54 21 6 37.6 26 52 -41 -26 34 27 -26 15 22 -26 38 58 -26 10 52 0.45 57 0 0 -25 59 8 21 6 50.3 27 51 -41 -26 8 41 -25 49 36 -26 13 12 -25 45 6 0.45 58 0 0 -25 33 18 21 7 3.6 28 50 -41 -25 42 51 -25 23 46 -25 47 23 -25 19 16 0.46 59 0 0 -25 7 25 21 7 17.3 29 50 -41 -25 16 58 -24 57 53 -25 21 29 -24 53 23 0.46 60 0 0 -24 41 30 21 7 31.6 30 49 -41 -24 51 3 -24 31 58 -24 55 34 -24 27 28 0.46 61 0 0 -24 15 32 21 7 46.4 31 49 -41 -24 25 5 -24 6 0 -24 29 36 -24 1 30 0.46 62 0 0 -23 49 34 21 8 1.8 32 48 -41 -23 59 7 -23 40 2 -24 3 38 -23 35 33 0.46 63 0 0 -23 23 36 21 8 17.6 33 47 -41 -23 33 8 -23 14 4 -23 37 39 -23 9 35 0.46 64 0 0 -22 57 39 21 8 34.0 34 47 -40 -23 7 11 -22 48 7 -23 11 41 -22 43 38 0.46 65 0 0 -22 31 43 21 8 50.8 35 46 -40 -22 41 14 -22 22 12 -22 45 45 -22 17 42 0.46 66 0 0 -22 5 49 21 9 8.2 36 45 -40 -22 15 20 -21 56 18 -22 19 51 -21 51 49 0.46 67 0 0 -21 39 59 21 9 26.1 37 45 -40 -21 49 30 -21 30 28 -21 54 0 -21 25 59 0.46 68 0 0 -21 14 12 21 9 44.5 38 44 -40 -21 23 43 -21 4 42 -21 28 13 -21 0 14 0.47 69 0 0 -20 48 31 21 10 3.3 39 43 -39 -20 58 1 -20 39 2 -21 2 31 -20 34 33 0.47 70 0 0 -20 22 56 21 10 22.7 40 42 -39 -20 32 25 -20 13 27 -20 36 55 -20 8 58 0.47 71 0 0 -19 57 27 21 10 42.5 41 42 -39 -20 6 56 -19 47 58 -20 11 25 -19 43 30 0.47 72 0 0 -19 32 6 21 11 2.8 42 41 -39 -19 41 34 -19 22 38 -19 46 3 -19 18 10 0.47 73 0 0 -19 6 53 21 11 23.6 43 40 -38 -19 16 21 -18 57 26 -19 20 50 -18 52 58 0.47 74 0 0 -18 41 49 21 11 44.8 44 39 -38 -18 51 17 -18 32 23 -18 55 45 -18 27 55 0.47 75 0 0 -18 16 56 21 12 6.4 45 38 -37 -18 26 23 -18 7 30 -18 30 51 -18 3 3 0.47 76 0 0 -17 52 14 21 12 28.5 46 37 -37 -18 1 40 -17 42 49 -18 6 8 -17 38 22 0.47 77 0 0 -17 27 44 21 12 50.9 47 37 -36 -17 37 9 -17 18 19 -17 41 37 -17 13 52 0.48 78 0 0 -17 3 26 21 13 13.8 47 36 -36 -17 12 51 -16 54 2 -17 17 18 -16 49 36 0.48 79 0 0 -16 39 22 21 13 37.1 48 35 -35 -16 48 46 -16 29 59 -16 53 13 -16 25 33 0.48 80 0 0 -16 15 33 21 14 0.8 49 33 -35 -16 24 56 -16 6 10 -16 29 22 -16 1 45 0.48 81 0 0 -15 51 58 21 14 24.8 50 32 -34 -16 1 21 -15 42 37 -16 5 47 -15 38 12 0.48 82 0 0 -15 28 40 21 14 49.2 51 31 -34 -15 38 2 -15 19 19 -15 42 27 -15 14 55 0.48 83 0 0 -15 5 39 21 15 13.9 52 30 -33 -15 14 59 -14 56 19 -15 19 25 -14 51 55 0.48 84 0 0 -14 42 55 21 15 38.9 53 29 -33 -14 52 15 -14 33 36 -14 56 40 -14 29 12 0.48 85 0 0 -14 20 30 21 16 4.3 54 27 -32 -14 29 49 -14 11 12 -14 34 13 -14 6 48 0.49 86 0 0 -13 58 24 21 16 29.9 54 26 -31 -14 7 42 -13 49 7 -14 12 6 -13 44 44 0.49 87 0 0 -13 36 38 21 16 55.8 55 25 -31 -13 45 55 -13 27 21 -13 50 18 -13 22 59 0.49 88 0 0 -13 15 12 21 17 22.0 56 23 -30 -13 24 28 -13 5 57 -13 28 51 -13 1 35 0.49 89 0 0 -12 54 8 21 17 48.4 57 22 -29 -13 3 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59 26 0.50 102 0 0 - 8 57 12 21 23 47.0 63 355 -19 - 9 6 15 - 8 48 10 - 9 10 31 - 8 43 54 0.50 103 0 0 - 8 42 7 21 24 15.2 63 353 -18 - 8 51 9 - 8 33 6 - 8 55 25 - 8 28 51 0.50 104 0 0 - 8 27 31 21 24 43.4 63 351 -17 - 8 36 32 - 8 18 31 - 8 40 48 - 8 14 16 0.51 105 0 0 - 8 13 25 21 25 11.5 63 348 -16 - 8 22 25 - 8 4 26 - 8 26 41 - 8 0 12 0.51 106 0 0 - 7 59 49 21 25 39.6 63 346 -15 - 8 8 48 - 7 50 50 - 8 13 3 - 7 46 36 0.51 107 0 0 - 7 46 42 21 26 7.7 63 343 -14 - 7 55 40 - 7 37 45 - 7 59 55 - 7 33 31 0.51 108 0 0 - 7 34 6 21 26 35.7 63 341 -13 - 7 43 3 - 7 25 9 - 7 47 17 - 7 20 56 0.51 109 0 0 - 7 22 0 21 27 3.7 63 339 -12 - 7 30 57 - 7 13 4 - 7 35 11 - 7 8 51 0.51 110 0 0 - 7 10 25 21 27 31.6 62 337 -11 - 7 19 21 - 7 1 30 - 7 23 34 - 6 57 18 0.51 111 0 0 - 6 59 21 21 27 59.3 62 334 -10 - 7 8 16 - 6 50 27 - 7 12 29 - 6 46 15 0.51 112 0 0 - 6 48 48 21 28 27.0 62 332 -9 - 6 57 43 - 6 39 55 - 7 1 56 - 6 35 43 0.51 113 0 0 - 6 38 47 21 28 54.5 61 330 -8 - 6 47 41 - 6 29 54 - 6 51 53 - 6 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45 2 - 6 27 24 - 6 49 12 - 6 23 15 0.50 151 0 0 - 6 45 37 21 42 53.9 29 295 30 - 6 54 27 - 6 36 48 - 6 58 37 - 6 32 39 0.50 152 0 0 - 6 55 29 21 43 8.3 28 295 32 - 7 4 19 - 6 46 40 - 7 8 30 - 6 42 30 0.50 153 0 0 - 7 5 48 21 43 22.2 27 295 33 - 7 14 38 - 6 56 58 - 7 18 49 - 6 52 48 0.50 154 0 0 - 7 16 33 21 43 35.6 26 294 34 - 7 25 24 - 7 7 43 - 7 29 35 - 7 3 32 0.50 155 0 0 - 7 27 44 21 43 48.6 25 294 35 - 7 36 35 - 7 18 53 - 7 40 47 - 7 14 43 0.49 156 0 0 - 7 39 21 21 44 1.0 24 294 36 - 7 48 13 - 7 30 30 - 7 52 24 - 7 26 19 0.49 157 0 0 - 7 51 23 21 44 12.9 23 294 37 - 8 0 16 - 7 42 31 - 8 4 28 - 7 38 20 0.49 158 0 0 - 8 3 51 21 44 24.3 22 293 38 - 8 12 44 - 7 54 58 - 8 16 56 - 7 50 47 0.49 159 0 0 - 8 16 43 21 44 35.2 21 293 39 - 8 25 36 - 8 7 50 - 8 29 49 - 8 3 38 0.49 160 0 0 - 8 29 59 21 44 45.6 20 293 40 - 8 38 53 - 8 21 6 - 8 43 6 - 8 16 54 0.49 161 0 0 - 8 43 39 21 44 55.5 19 293 41 - 8 52 34 - 8 34 45 - 8 56 47 - 8 30 33 0.49 162 0 0 - 8 57 43 21 45 4.9 18 292 42 - 9 6 39 - 8 48 49 - 9 10 52 - 8 44 36 0.49 163 0 0 - 9 12 10 21 45 13.7 17 292 43 - 9 21 6 - 9 3 15 - 9 25 20 - 8 59 2 0.49 164 0 0 - 9 27 0 21 45 22.0 16 292 44 - 9 35 57 - 9 18 4 - 9 40 11 - 9 13 51 0.49 165 0 0 - 9 42 12 21 45 29.9 15 292 45 - 9 51 9 - 9 33 15 - 9 55 23 - 9 29 2 0.49 166 0 0 - 9 57 46 21 45 37.1 14 292 46 -10 6 44 - 9 48 48 -10 10 58 - 9 44 35 0.49 167 0 0 -10 13 41 21 45 43.9 13 291 47 -10 22 40 -10 4 43 -10 26 54 -10 0 29 0.49 168 0 0 -10 29 57 21 45 50.1 12 291 48 -10 38 57 -10 20 58 -10 43 12 -10 16 44 0.49 169 0 0 -10 46 34 21 45 55.8 11 291 49 -10 55 34 -10 37 34 -10 59 49 -10 33 20 0.49 170 0 0 -11 3 31 21 46 1.0 10 291 50 -11 12 32 -10 54 31 -11 16 47 -10 50 16 0.49 171 0 0 -11 20 47 21 46 5.7 9 291 51 -11 29 49 -11 11 46 -11 34 5 -11 7 31 0.49 172 0 0 -11 38 23 21 46 9.8 8 290 52 -11 47 25 -11 29 21 -11 51 41 -11 25 6 0.49 173 0 0 -11 56 17 21 46 13.4 7 290 53 -12 5 20 -11 47 15 -12 9 37 -11 42 59 0.49 174 0 0 -12 14 29 21 46 16.5 6 290 54 -12 23 33 -12 5 26 -12 27 50 -12 1 10 0.50 175 0 0 -12 32 59 21 46 19.0 5 290 55 -12 42 4 -12 23 56 -12 46 21 -12 19 39 0.50 176 0 0 -12 51 46 21 46 21.0 4 289 57 -13 0 51 -12 42 42 -13 5 9 -12 38 25 0.51 177 0 0 -13 10 50 21 46 22.6 3 289 58 -13 19 56 -13 1 45 -13 24 14 -12 57 28 0.52 178 0 0 -13 30 10 21 46 23.5 1 289 59 -13 39 17 -13 21 5 -13 43 35 -13 16 47 0.55 179 0 0 -13 49 46 21 46 24.0 0 289 60 -13 58 53 -13 40 40 -14 3 12 -13 36 22 0.73 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 541-045431 * constellation : Cancer * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 08 14 41.9368 DE: +18 11 43.286 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 08 14 41.9369 DE: +18 11 43.286 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.1 * B mag [mag]: 12.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (364) Isara asteroid class: approx. diameter [km]: 29 approx. diameter ["]: 0.032 distance from Earth [AU]: 1.24820 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#94 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): 0.021", 0.006", 92.116° remarks: * orbital elements for (364)Isara : Mean anomaly = 27.5670671130 deg Arg. of pericenter = 313.0657219506 deg Long. of node = 105.5019272975 deg Inclination = 6.0057866163 deg Eccentricity = 0.1494326424 Semimajor axis = 2.2208245091 AU Perihelion dist = 1.8889608343 AU Mag: H = 9.80, G = 0.15 Epoch of elements : MJD 60637.89247946 TDT (2024 Nov 23.8925) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#942023Apr24,6.44,2024,11,23,21.419537,0.095811,-0.441577,2.465080,0.534152,-0.004535,0.001111,0.000001,0.000000 99.4028,18.1198,-144.63,-20.58,False UCAC4 541-045431,8.24498244,18.1953573,12.18,11.12,10.55,0.1,4,,8.26895921,18.1197944,1.98,2.08,0,0,0 364,Isara,12.91,28.799,1.2482,0,0,1.217,3.77,,1.4,0 0,27.3013,2024,11,23,313.0657,105.5019,6.0058,0.14943,2.22082,1.88896,9.80,5.0,0.15 1.236,0.0207,0.0057,92,0.0075,Known errors,1.16,0,-1,-1 20241123_045431,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org