IOTA/IOTA-ES occultation update for (823) Sisigambis / G084525.0+162312 event on 2024 Oct 16, 20:04 UT Visible from Summary ------- On 2024 Oct 16 UT, the 15.941 km diameter asteroid (823) Sisigambis will occult a 11.7 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 3.84 mag to 15.54 mag (the magnitude of the asteroid) for at most 0.590 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: 96 * date and approx. time of event: 2024 Oct 16, 20:00 - 2024 Oct 16, 20:08 * geocentric midpoint of event [JD]: 2460600.33662596 * magnitude of target star: 11.73 * magnitude drop [mag]: 3.84 * estimated maximum duration [s]: 0.590 * Moon: 99 % sunlit, 114° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.004", 117°) * approx speed of asteroid's shadow [km/s]: 27.0882 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G084525.0+162312 by 823 Sisigambis on 2024 Oct 16 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 75 0 0 4 59 22 20 0 56.4 1 74 -71 4 54 44 5 4 0 4 50 59 5 7 44 .... 76 0 0 5 16 32 20 0 56.5 2 74 -70 5 11 54 5 21 9 5 8 10 5 24 53 0.12 77 0 0 5 33 18 20 0 56.7 3 74 -69 5 28 40 5 37 55 5 24 56 5 41 39 0.17 78 0 0 5 49 39 20 0 57.0 4 74 -68 5 45 2 5 54 16 5 41 19 5 57 59 0.19 79 0 0 6 5 36 20 0 57.3 5 74 -67 6 1 0 6 10 12 5 57 17 6 13 55 0.20 80 0 0 6 21 9 20 0 57.7 6 74 -66 6 16 33 6 25 44 6 12 50 6 29 27 0.21 81 0 0 6 36 16 20 0 58.2 7 74 -65 6 31 41 6 40 51 6 27 58 6 44 34 0.22 82 0 0 6 50 58 20 0 58.8 8 74 -64 6 46 23 6 55 33 6 42 41 6 59 15 0.22 83 0 0 7 5 15 20 0 59.4 9 75 -63 7 0 41 7 9 50 6 56 59 7 13 31 0.22 84 0 0 7 19 7 20 1 0.1 10 75 -62 7 14 33 7 23 41 7 10 51 7 27 22 0.23 85 0 0 7 32 33 20 1 0.9 11 75 -61 7 27 59 7 37 7 7 24 18 7 40 48 0.23 86 0 0 7 45 34 20 1 1.8 12 75 -60 7 41 0 7 50 7 7 37 19 7 53 47 0.23 87 0 0 7 58 8 20 1 2.7 13 75 -59 7 53 35 8 2 41 7 49 55 8 6 21 0.23 88 0 0 8 10 17 20 1 3.7 14 75 -58 8 5 44 8 14 49 8 2 4 8 18 29 0.23 89 0 0 8 21 59 20 1 4.8 15 75 -57 8 17 27 8 26 31 8 13 47 8 30 11 0.24 90 0 0 8 33 16 20 1 6.0 16 75 -56 8 28 44 8 37 47 8 25 4 8 41 27 0.24 91 0 0 8 44 6 20 1 7.2 17 76 -55 8 39 34 8 48 37 8 35 55 8 52 16 0.24 92 0 0 8 54 29 20 1 8.5 18 76 -55 8 49 58 8 59 0 8 46 19 9 2 39 0.24 93 0 0 9 4 26 20 1 9.9 19 76 -54 8 59 55 9 8 57 8 56 16 9 12 35 0.24 94 0 0 9 13 57 20 1 11.3 20 76 -53 9 9 26 9 18 27 9 5 47 9 22 5 0.24 95 0 0 9 23 0 20 1 12.8 21 76 -52 9 18 30 9 27 31 9 14 52 9 31 9 0.24 96 0 0 9 31 37 20 1 14.4 22 76 -51 9 27 7 9 36 7 9 23 29 9 39 45 0.24 97 0 0 9 39 48 20 1 16.0 23 76 -50 9 35 18 9 44 17 9 31 40 9 47 55 0.24 98 0 0 9 47 31 20 1 17.7 24 76 -49 9 43 2 9 52 0 9 39 24 9 55 38 0.24 99 0 0 9 54 47 20 1 19.5 25 77 -48 9 50 18 9 59 17 9 46 41 10 2 54 0.24 100 0 0 10 1 37 20 1 21.3 26 77 -47 9 57 8 10 6 6 9 53 30 10 9 43 0.24 101 0 0 10 7 59 20 1 23.2 27 77 -46 10 3 30 10 12 28 9 59 53 10 16 5 0.24 102 0 0 10 13 54 20 1 25.1 28 77 -45 10 9 26 10 18 23 10 5 49 10 22 0 0.25 103 0 0 10 19 22 20 1 27.2 29 77 -44 10 14 54 10 23 51 10 11 17 10 27 27 0.25 104 0 0 10 24 23 20 1 29.2 30 77 -43 10 19 55 10 28 51 10 16 18 10 32 28 0.25 105 0 0 10 28 57 20 1 31.4 31 77 -42 10 24 28 10 33 25 10 20 52 10 37 1 0.25 106 0 0 10 33 3 20 1 33.6 32 77 -41 10 28 35 10 37 31 10 24 58 10 41 7 0.25 107 0 0 10 36 42 20 1 35.9 33 77 -40 10 32 14 10 41 9 10 28 37 10 44 46 0.25 108 0 0 10 39 53 20 1 38.2 34 77 -39 10 35 25 10 44 21 10 31 49 10 47 57 0.25 109 0 0 10 42 37 20 1 40.6 35 77 -38 10 38 10 10 47 5 10 34 33 10 50 41 0.25 110 0 0 10 44 54 20 1 43.0 36 78 -37 10 40 27 10 49 22 10 36 50 10 52 58 0.25 111 0 0 10 46 43 20 1 45.5 37 78 -36 10 42 16 10 51 11 10 38 40 10 54 47 0.25 112 0 0 10 48 5 20 1 48.1 38 78 -35 10 43 38 10 52 33 10 40 2 10 56 8 0.25 113 0 0 10 48 59 20 1 50.7 39 78 -34 10 44 32 10 53 27 10 40 56 10 57 3 0.25 114 0 0 10 49 26 20 1 53.3 40 78 -33 10 44 59 10 53 54 10 41 23 10 57 29 0.25 115 0 0 10 49 25 20 1 56.1 41 78 -32 10 44 58 10 53 53 10 41 22 10 57 29 0.25 116 0 0 10 48 57 20 1 58.8 42 78 -31 10 44 29 10 53 24 10 40 53 10 57 0 0.25 117 0 0 10 48 1 20 2 1.7 43 78 -30 10 43 33 10 52 28 10 39 57 10 56 4 0.25 118 0 0 10 46 37 20 2 4.6 44 78 -29 10 42 10 10 51 5 10 38 34 10 54 41 0.25 119 0 0 10 44 46 20 2 7.5 45 78 -28 10 40 19 10 49 14 10 36 42 10 52 50 0.25 120 0 0 10 42 27 20 2 10.5 46 78 -27 10 38 0 10 46 55 10 34 23 10 50 31 0.25 121 0 0 10 39 41 20 2 13.5 47 77 -26 10 35 13 10 44 9 10 31 37 10 47 45 0.25 122 0 0 10 36 27 20 2 16.6 48 77 -25 10 31 59 10 40 55 10 28 22 10 44 31 0.25 123 0 0 10 32 45 20 2 19.8 49 77 -24 10 28 17 10 37 13 10 24 40 10 40 49 0.25 124 0 0 10 28 36 20 2 23.0 49 77 -23 10 24 7 10 33 4 10 20 31 10 36 40 0.25 125 0 0 10 23 58 20 2 26.2 50 77 -22 10 19 30 10 28 27 10 15 53 10 32 3 0.25 126 0 0 10 18 54 20 2 29.5 51 77 -21 10 14 25 10 23 22 10 10 48 10 26 59 0.25 127 0 0 10 13 21 20 2 32.9 52 76 -20 10 8 52 10 17 50 10 5 15 10 21 27 0.25 128 0 0 10 7 21 20 2 36.2 53 76 -19 10 2 52 10 11 50 9 59 15 10 15 27 0.25 129 0 0 10 0 54 20 2 39.7 54 76 -18 9 56 24 10 5 23 9 52 47 10 9 0 0.25 130 0 0 9 53 58 20 2 43.1 55 76 -17 9 49 29 9 58 28 9 45 51 10 2 5 0.25 131 0 0 9 46 36 20 2 46.7 56 75 -16 9 42 6 9 51 5 9 38 28 9 54 43 0.25 132 0 0 9 38 45 20 2 50.2 57 75 -15 9 34 15 9 43 15 9 30 37 9 46 53 0.25 133 0 0 9 30 27 20 2 53.8 58 74 -14 9 25 57 9 34 58 9 22 19 9 38 36 0.25 134 0 0 9 21 42 20 2 57.5 59 74 -13 9 17 11 9 26 12 9 13 33 9 29 51 0.25 135 0 0 9 12 29 20 3 1.2 60 73 -12 9 7 58 9 17 0 9 4 19 9 20 39 0.25 136 0 0 9 2 49 20 3 4.9 61 73 -11 8 58 18 9 7 20 8 54 38 9 10 59 0.25 137 0 0 8 52 41 20 3 8.7 62 72 -10 8 48 10 8 57 13 8 44 30 9 0 52 0.25 138 0 0 8 42 6 20 3 12.5 63 71 -9 8 37 34 8 46 38 8 33 54 8 50 17 0.25 139 0 0 8 31 4 20 3 16.4 63 70 -8 8 26 32 8 35 36 8 22 52 8 39 16 0.25 140 0 0 8 19 34 20 3 20.3 64 69 -7 8 15 2 8 24 7 8 11 21 8 27 47 0.25 141 0 0 8 7 38 20 3 24.2 65 68 -6 8 3 5 8 12 11 7 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32.8 0 289 66 -31 52 15 -31 42 49 -31 56 3 -31 39 1 0.23 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: G084525.0+162312 * constellation : Cancer * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 08 45 25.0100 DE: +16 23 12.078 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 08 45 25.0104 DE: +16 23 12.076 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.7 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (823) Sisigambis asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.05330 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#62 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): 0.013", 0.004", 116.915° remarks: * orbital elements for (823)Sisigambis : Mean anomaly = 349.6563004350 deg Arg. of pericenter = 218.5817124842 deg Long. of node = 254.9641430856 deg Inclination = 3.6472351312 deg Eccentricity = 0.0903749251 Semimajor axis = 2.2214692551 AU Perihelion dist = 2.0207041375 AU Mag: H = 11.21, G = 0.15 Epoch of elements : MJD 60599.83662558 TDT (2024 Oct 16.8366) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#622023Apr24,0.59,2024,10,16,20.079023,-0.080770,-0.230369,14.450429,-4.994847,-0.004935,0.001313,0.000000,0.000000 164.6864,16.2979,-124.84,-9.29,False G084525.0+162312,8.75694718,16.3866884,12.14,11.73,11.51,0.0,0,,8.78002932,16.2979123,0.21,0.17,1,1,1 823,Sisigambis,15.54,15.941,2.0533,0,0,4.299,-21.40,,0.8,0 0,349.4073,2024,10,16,218.5817,254.9641,3.6472,0.09037,2.22147,2.02070,11.20,5.0,0.15 1.404,0.0127,0.0040,117,0.0043,Known errors,1.75,0,-1,-1 20241016_162312,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org