IOTA/IOTA-ES occultation update for (823) Sisigambis / UCAC4 504-050658 event on 2024 Nov 24, 23:17 UT Visible from Summary ------- On 2024 Nov 24 UT, the 15.932 km diameter asteroid (823) Sisigambis will occult a 11.9 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.21 mag to 15.04 mag (the magnitude of the asteroid) for at most 1.110 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 24, 23:10 - 2024 Nov 24, 23:23 * geocentric midpoint of event [JD]: 2460639.47029317 * magnitude of target star: 11.89 * magnitude drop [mag]: 3.21 * estimated maximum duration [s]: 1.110 * Moon: 32 % sunlit, 31° distance * Sun: 99° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.004", 117°) * approx speed of asteroid's shadow [km/s]: 14.3084 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 504-050658 by 823 Sisigambis on 2024 Nov 24 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 5 0 0 - 3 4 59 23 10 50.4 1 79 -66 - 3 10 5 - 2 59 53 - 3 13 20 - 2 56 39 .... 6 0 0 - 2 54 26 23 10 50.6 2 79 -66 - 2 59 31 - 2 49 21 - 3 2 46 - 2 46 7 0.40 7 0 0 - 2 44 28 23 10 51.0 3 79 -66 - 2 49 33 - 2 39 24 - 2 52 48 - 2 36 10 0.46 8 0 0 - 2 35 7 23 10 51.5 4 79 -67 - 2 40 11 - 2 30 2 - 2 43 25 - 2 26 49 0.50 9 0 0 - 2 26 20 23 10 52.2 5 79 -67 - 2 31 24 - 2 21 16 - 2 34 38 - 2 18 3 0.52 10 0 0 - 2 18 10 23 10 53.1 6 79 -67 - 2 23 13 - 2 13 6 - 2 26 27 - 2 9 53 0.53 11 0 0 - 2 10 35 23 10 54.2 7 79 -67 - 2 15 38 - 2 5 32 - 2 18 52 - 2 2 19 0.54 12 0 0 - 2 3 36 23 10 55.3 8 79 -67 - 2 8 39 - 1 58 33 - 2 11 52 - 1 55 20 0.55 13 0 0 - 1 57 13 23 10 56.7 9 79 -67 - 2 2 16 - 1 52 11 - 2 5 29 - 1 48 58 0.55 14 0 0 - 1 51 26 23 10 58.2 10 79 -67 - 1 56 29 - 1 46 24 - 1 59 42 - 1 43 11 0.56 15 0 0 - 1 46 16 23 10 59.9 11 79 -67 - 1 51 18 - 1 41 14 - 1 54 31 - 1 38 1 0.56 16 0 0 - 1 41 42 23 11 1.7 12 79 -66 - 1 46 44 - 1 36 40 - 1 49 57 - 1 33 27 0.56 17 0 0 - 1 37 44 23 11 3.7 13 79 -66 - 1 42 46 - 1 32 42 - 1 45 59 - 1 29 30 0.57 18 0 0 - 1 34 22 23 11 5.8 14 79 -66 - 1 39 24 - 1 29 21 - 1 42 37 - 1 26 8 0.57 19 0 0 - 1 31 37 23 11 8.1 15 79 -66 - 1 36 39 - 1 26 36 - 1 39 52 - 1 23 23 0.57 20 0 0 - 1 29 29 23 11 10.5 16 78 -65 - 1 34 31 - 1 24 27 - 1 37 43 - 1 21 15 0.57 21 0 0 - 1 27 57 23 11 13.1 17 78 -65 - 1 32 59 - 1 22 55 - 1 36 11 - 1 19 43 0.58 22 0 0 - 1 27 2 23 11 15.9 18 78 -64 - 1 32 4 - 1 22 0 - 1 35 16 - 1 18 48 0.58 23 0 0 - 1 26 43 23 11 18.8 19 78 -64 - 1 31 45 - 1 21 42 - 1 34 58 - 1 18 30 0.58 24 0 0 - 1 27 2 23 11 21.8 20 78 -63 - 1 32 4 - 1 22 0 - 1 35 16 - 1 18 48 0.58 25 0 0 - 1 27 57 23 11 25.0 21 78 -63 - 1 32 59 - 1 22 56 - 1 36 12 - 1 19 43 0.58 26 0 0 - 1 29 30 23 11 28.4 22 78 -62 - 1 34 32 - 1 24 28 - 1 37 45 - 1 21 16 0.58 27 0 0 - 1 31 39 23 11 31.9 23 78 -61 - 1 36 41 - 1 26 37 - 1 39 54 - 1 23 25 0.58 28 0 0 - 1 34 26 23 11 35.6 24 78 -61 - 1 39 28 - 1 29 24 - 1 42 41 - 1 26 11 0.58 29 0 0 - 1 37 49 23 11 39.4 25 77 -60 - 1 42 52 - 1 32 47 - 1 46 5 - 1 29 34 0.59 30 0 0 - 1 41 50 23 11 43.3 26 77 -59 - 1 46 53 - 1 36 48 - 1 50 7 - 1 33 35 0.59 31 0 0 - 1 46 29 23 11 47.4 27 77 -59 - 1 51 32 - 1 41 26 - 1 54 45 - 1 38 13 0.59 32 0 0 - 1 51 45 23 11 51.6 28 77 -58 - 1 56 48 - 1 46 41 - 2 0 2 - 1 43 28 0.59 33 0 0 - 1 57 38 23 11 56.0 29 77 -57 - 2 2 42 - 1 52 34 - 2 5 55 - 1 49 21 0.59 34 0 0 - 2 4 8 23 12 0.6 30 76 -56 - 2 9 13 - 1 59 4 - 2 12 27 - 1 55 51 0.59 35 0 0 - 2 11 16 23 12 5.2 31 76 -56 - 2 16 21 - 2 6 12 - 2 19 35 - 2 2 58 0.59 36 0 0 - 2 19 2 23 12 10.1 32 76 -55 - 2 24 7 - 2 13 57 - 2 27 22 - 2 10 43 0.59 37 0 0 - 2 27 25 23 12 15.0 33 76 -54 - 2 32 31 - 2 22 20 - 2 35 46 - 2 19 6 0.59 38 0 0 - 2 36 26 23 12 20.1 34 75 -53 - 2 41 32 - 2 31 21 - 2 44 48 - 2 28 6 0.59 39 0 0 - 2 46 5 23 12 25.3 35 75 -52 - 2 51 12 - 2 40 59 - 2 54 27 - 2 37 44 0.59 40 0 0 - 2 56 22 23 12 30.7 35 75 -51 - 3 1 29 - 2 51 15 - 3 4 45 - 2 47 59 0.59 41 0 0 - 3 7 16 23 12 36.2 36 74 -50 - 3 12 23 - 3 2 8 - 3 15 40 - 2 58 52 0.59 42 0 0 - 3 18 48 23 12 41.9 37 74 -49 - 3 23 56 - 3 13 40 - 3 27 13 - 3 10 23 0.59 43 0 0 - 3 30 57 23 12 47.6 38 73 -48 - 3 36 6 - 3 25 49 - 3 39 23 - 3 22 32 0.59 44 0 0 - 3 43 45 23 12 53.5 39 73 -47 - 3 48 54 - 3 38 35 - 3 52 12 - 3 35 18 0.59 45 0 0 - 3 57 10 23 12 59.6 40 73 -47 - 4 2 20 - 3 52 0 - 4 5 38 - 3 48 42 0.60 46 0 0 - 4 11 12 23 13 5.8 41 72 -46 - 4 16 24 - 4 6 2 - 4 19 42 - 4 2 44 0.60 47 0 0 - 4 25 53 23 13 12.1 42 71 -45 - 4 31 5 - 4 20 41 - 4 34 24 - 4 17 23 0.60 48 0 0 - 4 41 11 23 13 18.5 43 71 -44 - 4 46 24 - 4 35 59 - 4 49 43 - 4 32 40 0.60 49 0 0 - 4 57 7 23 13 25.0 44 70 -43 - 5 2 20 - 4 51 54 - 5 5 40 - 4 48 34 0.60 50 0 0 - 5 13 40 23 13 31.7 45 70 -42 - 5 18 54 - 5 8 26 - 5 22 15 - 5 5 6 0.60 51 0 0 - 5 30 51 23 13 38.5 45 69 -41 - 5 36 6 - 5 25 36 - 5 39 27 - 5 22 15 0.60 52 0 0 - 5 48 39 23 13 45.4 46 68 -40 - 5 53 55 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23 17 7.6 59 30 -12 -16 29 9 -16 17 40 -16 32 49 -16 14 1 0.59 78 0 0 -16 55 29 23 17 16.3 59 28 -11 -17 1 15 -16 49 44 -17 4 55 -16 46 4 0.59 79 0 0 -17 27 58 23 17 25.1 59 25 -10 -17 33 45 -17 22 11 -17 37 26 -17 18 31 0.59 80 0 0 -18 0 50 23 17 33.9 59 23 -9 -18 6 39 -17 55 3 -18 10 21 -17 51 21 0.59 81 0 0 -18 34 5 23 17 42.6 59 21 -8 -18 39 55 -18 28 16 -18 43 38 -18 24 34 0.59 82 0 0 -19 7 42 23 17 51.4 59 19 -7 -19 13 32 -19 1 51 -19 17 16 -18 58 8 0.59 83 0 0 -19 41 38 23 18 0.1 59 17 -6 -19 47 30 -19 35 47 -19 51 14 -19 32 3 0.59 84 0 0 -20 15 54 23 18 8.8 58 14 -4 -20 21 47 -20 10 1 -20 25 32 -20 6 17 0.59 85 0 0 -20 50 27 23 18 17.4 58 12 -3 -20 56 21 -20 44 34 -21 0 7 -20 40 49 0.59 86 0 0 -21 25 18 23 18 26.1 58 10 -2 -21 31 13 -21 19 23 -21 34 59 -21 15 37 0.59 87 0 0 -22 0 24 23 18 34.6 57 8 -1 -22 6 20 -21 54 28 -22 10 7 -21 50 42 0.59 88 0 0 -22 35 44 23 18 43.1 57 6 0 -22 41 41 -22 29 47 -22 45 29 -22 26 0 0.59 89 0 0 -23 11 17 23 18 51.6 56 4 1 -23 17 15 -23 5 19 -23 21 3 -23 1 32 0.59 90 0 0 -23 47 2 23 19 0.0 56 3 2 -23 53 1 -23 41 3 -23 56 50 -23 37 15 0.59 91 0 0 -24 22 57 23 19 8.3 55 1 3 -24 28 57 -24 16 58 -24 32 46 -24 13 9 0.59 92 0 0 -24 59 1 23 19 16.5 54 359 4 -25 5 2 -24 53 1 -25 8 52 -24 49 11 0.59 93 0 0 -25 35 13 23 19 24.7 54 357 5 -25 41 14 -25 29 12 -25 45 5 -25 25 22 0.59 94 0 0 -26 11 31 23 19 32.8 53 356 7 -26 17 33 -26 5 29 -26 21 24 -26 1 38 0.59 95 0 0 -26 47 53 23 19 40.7 52 354 8 -26 53 56 -26 41 51 -26 57 48 -26 38 0 0.59 96 0 0 -27 24 19 23 19 48.6 52 352 9 -27 30 23 -27 18 16 -27 34 15 -27 14 25 0.59 97 0 0 -28 0 47 23 19 56.3 51 351 10 -28 6 52 -27 54 44 -28 10 44 -27 50 52 0.59 98 0 0 -28 37 16 23 20 4.0 50 349 11 -28 43 21 -28 31 12 -28 47 14 -28 27 19 0.59 99 0 0 -29 13 44 23 20 11.5 50 348 12 -29 19 49 -29 7 39 -29 23 43 -29 3 46 0.59 100 0 0 -29 50 10 23 20 18.9 49 347 13 -29 56 16 -29 44 4 -30 0 9 -29 40 11 0.59 101 0 0 -30 26 32 23 20 26.2 48 345 14 -30 32 38 -30 20 26 -30 36 32 -30 16 33 0.59 102 0 0 -31 2 49 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26 -38 10 11 -37 57 58 -38 14 6 -37 54 5 0.59 115 0 0 -38 37 25 23 21 53.1 36 330 27 -38 43 32 -38 31 19 -38 47 26 -38 27 26 0.59 116 0 0 -39 10 25 23 21 58.2 35 329 28 -39 16 31 -39 4 19 -39 20 24 -39 0 26 0.58 117 0 0 -39 43 2 23 22 3.1 34 328 29 -39 49 8 -39 36 57 -39 53 2 -39 33 5 0.58 118 0 0 -40 15 18 23 22 7.9 33 327 30 -40 21 23 -40 9 13 -40 25 16 -40 5 21 0.58 119 0 0 -40 47 10 23 22 12.5 32 326 30 -40 53 14 -40 41 6 -40 57 7 -40 37 14 0.58 120 0 0 -41 18 38 23 22 16.9 32 326 31 -41 24 42 -41 12 34 -41 28 34 -41 8 43 0.58 121 0 0 -41 49 41 23 22 21.2 31 325 32 -41 55 45 -41 43 38 -41 59 37 -41 39 47 0.58 122 0 0 -42 20 20 23 22 25.4 30 324 33 -42 26 22 -42 14 17 -42 30 14 -42 10 27 0.58 123 0 0 -42 50 32 23 22 29.4 29 323 33 -42 56 34 -42 44 31 -43 0 25 -42 40 40 0.58 124 0 0 -43 20 19 23 22 33.2 28 322 34 -43 26 20 -43 14 18 -43 30 10 -43 10 28 0.58 125 0 0 -43 49 38 23 22 36.9 27 321 35 -43 55 39 -43 43 38 -43 59 29 -43 39 49 0.59 126 0 0 -44 18 31 23 22 40.5 26 320 36 -44 24 30 -44 12 32 -44 28 20 -44 8 43 0.59 127 0 0 -44 46 56 23 22 43.9 26 320 36 -44 52 55 -44 40 58 -44 56 44 -44 37 10 0.59 128 0 0 -45 14 54 23 22 47.2 25 319 37 -45 20 51 -45 8 57 -45 24 40 -45 5 9 0.59 129 0 0 -45 42 23 23 22 50.4 24 318 37 -45 48 20 -45 36 27 -45 52 8 -45 32 40 0.59 130 0 0 -46 9 25 23 22 53.4 23 317 38 -46 15 21 -46 3 30 -46 19 8 -45 59 43 0.59 131 0 0 -46 35 58 23 22 56.3 22 316 39 -46 41 53 -46 30 4 -46 45 39 -46 26 18 0.59 132 0 0 -47 2 2 23 22 59.1 22 315 39 -47 7 56 -46 56 9 -47 11 42 -46 52 24 0.59 133 0 0 -47 27 38 23 23 1.7 21 315 40 -47 33 31 -47 21 46 -47 37 16 -47 18 2 0.59 134 0 0 -47 52 45 23 23 4.2 20 314 40 -47 58 37 -47 46 54 -48 2 21 -47 43 11 0.59 135 0 0 -48 17 24 23 23 6.6 19 313 41 -48 23 14 -48 11 34 -48 26 58 -48 7 51 0.59 136 0 0 -48 41 33 23 23 8.9 18 312 42 -48 47 23 -48 35 45 -48 51 6 -48 32 2 0.59 137 0 0 -49 5 14 23 23 11.1 18 311 42 -49 11 2 -48 59 26 -49 14 45 -48 55 45 0.59 138 0 0 -49 28 26 23 23 13.1 17 311 43 -49 34 13 -49 22 40 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8 0.59 151 0 0 -53 47 24 23 23 30.9 8 300 48 -53 52 55 -53 41 52 -53 56 27 -53 38 21 0.59 152 0 0 -54 4 9 23 23 31.6 7 299 48 -54 9 39 -53 58 39 -54 13 10 -53 55 8 0.59 153 0 0 -54 20 28 23 23 32.3 7 298 48 -54 25 57 -54 14 59 -54 29 27 -54 11 29 0.59 154 0 0 -54 36 21 23 23 33.0 6 298 49 -54 41 49 -54 30 53 -54 45 19 -54 27 24 0.59 155 0 0 -54 51 49 23 23 33.5 5 297 49 -54 57 16 -54 46 22 -55 0 45 -54 42 54 0.60 156 0 0 -55 6 51 23 23 34.0 5 296 49 -55 12 17 -55 1 26 -55 15 45 -54 57 58 0.60 157 0 0 -55 21 29 23 23 34.4 4 295 49 -55 26 54 -55 16 4 -55 30 21 -55 12 38 0.60 158 0 0 -55 35 42 23 23 34.8 3 294 49 -55 41 6 -55 30 18 -55 44 33 -55 26 52 0.60 159 0 0 -55 49 31 23 23 35.1 3 294 50 -55 54 53 -55 44 8 -55 58 19 -55 40 43 0.61 160 0 0 -56 2 55 23 23 35.3 2 293 50 -56 8 17 -55 57 34 -56 11 42 -55 54 9 0.61 161 0 0 -56 15 56 23 23 35.5 2 292 50 -56 21 17 -56 10 35 -56 24 41 -56 7 11 0.62 162 0 0 -56 28 33 23 23 35.6 1 291 50 -56 33 53 -56 23 13 -56 37 17 -56 19 50 0.64 163 0 0 -56 40 47 23 23 35.6 0 290 50 -56 46 6 -56 35 28 -56 49 29 -56 32 5 0.73 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 504-050658 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 41 04.1473 DE: +10 46 10.887 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 41 04.1475 DE: +10 46 10.886 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.9 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (823) Sisigambis asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.014 distance from Earth [AU]: 1.61740 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): 0.015", 0.004", 117° remarks: * orbital elements for (823)Sisigambis : Mean anomaly = 1.3099198724 deg Arg. of pericenter = 218.5763027604 deg Long. of node = 254.9641560981 deg Inclination = 3.6472384916 deg Eccentricity = 0.0903088260 Semimajor axis = 2.2213105986 AU Perihelion dist = 2.0207066462 AU Mag: H = 11.21, G = 0.15 Epoch of elements : MJD 60638.97029308 TDT (2024 Nov 24.9703) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#622023Apr24,1.11,2024,11,24,23.287036,-0.235557,-0.452974,7.168852,-3.718862,-0.005097,0.001817,0.000000,0.000000 91.8956,10.6571,-172.56,-20.79,False UCAC4 504-050658,9.68448532,10.7696912,12.33,11.89,11.65,0.0,0,,9.70680160,10.6570877,3.21,3.01,0,0,0 823,Sisigambis,15.04,15.932,1.6174,0,0,2.644,-20.22,,0.8,0 0,1.0211,2024,11,24,218.5763,254.9642,3.6472,0.09031,2.22131,2.02071,11.20,5.0,0.15 1.319,0.0153,0.0043,117,0.0043,Known errors,1.22,0,-1,-1 20241124_050658,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org