IOTA/IOTA-ES occultation update for (4105) Tsia / UCAC4 379-066424 event on 2024 Dec 22, 19:41 UT Visible from Summary ------- On 2024 Dec 22 UT, the 13.049 km diameter asteroid (4105) Tsia will occult a 11.9 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.16 mag to 18.09 mag (the magnitude of the asteroid) for at most 0.350 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: 95 * date and approx. time of event: 2024 Dec 22, 19:39 - 2024 Dec 22, 19:44 * geocentric midpoint of event [JD]: 2460667.32060683 * magnitude of target star: 11.93 * magnitude drop [mag]: 6.16 * estimated maximum duration [s]: 0.350 * Moon: 51 % sunlit, 36° distance * Sun: 55° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.003", 103°) * approx speed of asteroid's shadow [km/s]: 36.9356 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 379-066424 by 4105 Tsia on 2024 Dec 22 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 94 0 0 -14 55 41 19 39 13.1 0 105 -42 -14 59 59 -14 51 23 -15 3 40 -14 47 42 .... 95 0 0 -15 11 32 19 39 13.2 1 104 -42 -15 15 50 -15 7 13 -15 19 32 -15 3 32 0.48 96 0 0 -15 27 45 19 39 13.3 2 104 -41 -15 32 4 -15 23 26 -15 35 46 -15 19 44 0.54 97 0 0 -15 44 20 19 39 13.5 4 104 -40 -15 48 39 -15 40 0 -15 52 22 -15 36 18 0.56 98 0 0 -16 1 16 19 39 13.7 5 104 -39 -16 5 36 -15 56 56 -16 9 19 -15 53 14 0.57 99 0 0 -16 18 33 19 39 14.0 6 103 -38 -16 22 54 -16 14 13 -16 26 37 -16 10 30 0.58 100 0 0 -16 36 12 19 39 14.4 7 103 -37 -16 40 33 -16 31 51 -16 44 17 -16 28 8 0.59 101 0 0 -16 54 11 19 39 14.8 8 103 -37 -16 58 32 -16 49 50 -17 2 16 -16 46 6 0.59 102 0 0 -17 12 30 19 39 15.3 9 102 -36 -17 16 52 -17 8 8 -17 20 36 -17 4 24 0.59 103 0 0 -17 31 9 19 39 15.9 10 102 -35 -17 35 31 -17 26 46 -17 39 16 -17 23 2 0.60 104 0 0 -17 50 7 19 39 16.5 11 102 -34 -17 54 30 -17 45 44 -17 58 15 -17 41 59 0.60 105 0 0 -18 9 24 19 39 17.2 12 102 -33 -18 13 48 -18 5 1 -18 17 33 -18 1 16 0.60 106 0 0 -18 29 0 19 39 17.9 13 101 -32 -18 33 24 -18 24 36 -18 37 10 -18 20 51 0.60 107 0 0 -18 48 54 19 39 18.7 14 101 -31 -18 53 18 -18 44 29 -18 57 5 -18 40 44 0.60 108 0 0 -19 9 5 19 39 19.6 14 100 -30 -19 13 30 -19 4 41 -19 17 17 -19 0 54 0.60 109 0 0 -19 29 34 19 39 20.5 15 100 -29 -19 33 59 -19 25 9 -19 37 47 -19 21 22 0.60 110 0 0 -19 50 20 19 39 21.5 16 100 -28 -19 54 45 -19 45 54 -19 58 33 -19 42 7 0.61 111 0 0 -20 11 21 19 39 22.6 17 99 -27 -20 15 48 -20 6 55 -20 19 36 -20 3 8 0.61 112 0 0 -20 32 39 19 39 23.6 18 99 -27 -20 37 6 -20 28 12 -20 40 54 -20 24 24 0.61 113 0 0 -20 54 12 19 39 24.8 19 98 -26 -20 58 39 -20 49 45 -21 2 28 -20 45 56 0.61 114 0 0 -21 15 59 19 39 26.0 20 98 -25 -21 20 27 -21 11 32 -21 24 16 -21 7 43 0.61 115 0 0 -21 38 1 19 39 27.3 21 98 -24 -21 42 29 -21 33 33 -21 46 19 -21 29 44 0.61 116 0 0 -22 0 16 19 39 28.6 22 97 -23 -22 4 45 -21 55 48 -22 8 35 -21 51 58 0.61 117 0 0 -22 22 45 19 39 30.0 23 97 -22 -22 27 14 -22 18 16 -22 31 5 -22 14 26 0.61 118 0 0 -22 45 26 19 39 31.4 24 96 -21 -22 49 56 -22 40 57 -22 53 46 -22 37 6 0.61 119 0 0 -23 8 19 19 39 32.9 25 96 -20 -23 12 49 -23 3 49 -23 16 40 -22 59 58 0.61 120 0 0 -23 31 23 19 39 34.5 26 95 -19 -23 35 54 -23 26 53 -23 39 45 -23 23 2 0.61 121 0 0 -23 54 38 19 39 36.0 27 94 -18 -23 59 9 -23 50 7 -24 3 1 -23 46 16 0.61 122 0 0 -24 18 3 19 39 37.7 28 94 -17 -24 22 34 -24 13 32 -24 26 27 -24 9 40 0.61 123 0 0 -24 41 38 19 39 39.4 29 93 -16 -24 46 9 -24 37 6 -24 50 2 -24 33 14 0.61 124 0 0 -25 5 21 19 39 41.1 30 93 -15 -25 9 53 -25 0 49 -25 13 46 -24 56 57 0.61 125 0 0 -25 29 12 19 39 42.9 31 92 -14 -25 33 45 -25 24 40 -25 37 38 -25 20 47 0.61 126 0 0 -25 53 11 19 39 44.7 32 91 -13 -25 57 44 -25 48 39 -26 1 38 -25 44 46 0.61 127 0 0 -26 17 17 19 39 46.6 33 91 -12 -26 21 50 -26 12 44 -26 25 44 -26 8 51 0.61 128 0 0 -26 41 29 19 39 48.5 34 90 -11 -26 46 3 -26 36 56 -26 49 57 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14 14 -53 5 58 -53 17 46 -53 2 26 0.62 -121 0 0 -53 9 23 19 43 32.6 33 292 60 -53 13 31 -53 5 15 -53 17 3 -53 1 43 0.62 -120 0 0 -53 8 23 19 43 33.8 33 291 60 -53 12 31 -53 4 15 -53 16 4 -53 0 43 0.62 -119 0 0 -53 7 7 19 43 34.9 32 291 60 -53 11 15 -53 2 59 -53 14 48 -52 59 27 0.62 -118 0 0 -53 5 34 19 43 36.1 32 290 60 -53 9 43 -53 1 26 -53 13 15 -52 57 54 0.62 -117 0 0 -53 3 45 19 43 37.2 31 289 60 -53 7 54 -52 59 37 -53 11 26 -52 56 5 0.62 -116 0 0 -53 1 40 19 43 38.3 31 288 60 -53 5 48 -52 57 31 -53 9 21 -52 53 59 0.62 -115 0 0 -52 59 18 19 43 39.4 30 287 60 -53 3 26 -52 55 9 -53 6 59 -52 51 37 0.62 -114 0 0 -52 56 39 19 43 40.4 29 286 60 -53 0 48 -52 52 30 -53 4 21 -52 48 58 0.62 -113 0 0 -52 53 44 19 43 41.5 29 285 60 -52 57 53 -52 49 35 -53 1 26 -52 46 2 0.62 -112 0 0 -52 50 32 19 43 42.5 28 284 60 -52 54 41 -52 46 23 -52 58 15 -52 42 50 0.62 -111 0 0 -52 47 4 19 43 43.5 28 283 60 -52 51 13 -52 42 55 -52 54 47 -52 39 22 0.62 -110 0 0 -52 43 19 19 43 44.5 27 282 60 -52 47 29 -52 39 10 -52 51 2 -52 35 36 0.62 -109 0 0 -52 39 17 19 43 45.5 27 281 60 -52 43 27 -52 35 8 -52 47 1 -52 31 34 0.62 -108 0 0 -52 34 59 19 43 46.5 26 280 60 -52 39 9 -52 30 49 -52 42 43 -52 27 16 0.62 -107 0 0 -52 30 24 19 43 47.4 25 280 60 -52 34 34 -52 26 14 -52 38 9 -52 22 40 0.62 -106 0 0 -52 25 32 19 43 48.4 25 279 60 -52 29 43 -52 21 22 -52 33 17 -52 17 48 0.62 -105 0 0 -52 20 24 19 43 49.3 24 278 60 -52 24 34 -52 16 13 -52 28 9 -52 12 39 0.62 -104 0 0 -52 14 58 19 43 50.2 24 277 60 -52 19 9 -52 10 47 -52 22 44 -52 7 13 0.62 -103 0 0 -52 9 15 19 43 51.0 23 276 60 -52 13 27 -52 5 4 -52 17 2 -52 1 30 0.62 -102 0 0 -52 3 16 19 43 51.9 22 275 59 -52 7 28 -51 59 5 -52 11 3 -51 55 30 0.62 -101 0 0 -51 56 59 19 43 52.7 22 274 59 -52 1 11 -51 52 48 -52 4 47 -51 49 12 0.62 -100 0 0 -51 50 26 19 43 53.5 21 274 59 -51 54 38 -51 46 14 -51 58 14 -51 42 38 0.63 - 99 0 0 -51 43 35 19 43 54.3 21 273 59 -51 47 48 -51 39 23 -51 51 24 -51 35 47 0.63 - 98 0 0 -51 36 27 19 43 55.1 20 272 58 -51 40 40 -51 32 15 -51 44 17 -51 28 39 0.63 - 97 0 0 -51 29 2 19 43 55.9 19 271 58 -51 33 16 -51 24 49 -51 36 53 -51 21 13 0.63 - 96 0 0 -51 21 20 19 43 56.6 19 270 58 -51 25 34 -51 17 6 -51 29 11 -51 13 30 0.63 - 95 0 0 -51 13 20 19 43 57.3 18 269 58 -51 17 34 -51 9 6 -51 21 12 -51 5 29 0.63 - 94 0 0 -51 5 3 19 43 58.0 17 269 57 -51 9 18 -51 0 49 -51 12 56 -50 57 12 0.63 - 93 0 0 -50 56 29 19 43 58.7 17 268 57 -51 0 44 -50 52 14 -51 4 22 -50 48 36 0.63 - 92 0 0 -50 47 37 19 43 59.4 16 267 57 -50 51 52 -50 43 22 -50 55 31 -50 39 44 0.63 - 91 0 0 -50 38 27 19 44 0.0 16 266 56 -50 42 43 -50 34 12 -50 46 22 -50 30 33 0.63 - 90 0 0 -50 29 0 19 44 0.6 15 265 56 -50 33 16 -50 24 44 -50 36 56 -50 21 6 0.63 - 89 0 0 -50 19 16 19 44 1.2 14 265 56 -50 23 32 -50 14 59 -50 27 12 -50 11 20 0.63 - 88 0 0 -50 9 13 19 44 1.8 14 264 55 -50 13 30 -50 4 57 -50 17 10 -50 1 17 0.64 - 87 0 0 -49 58 53 19 44 2.3 13 263 55 -50 3 11 -49 54 36 -50 6 51 -49 50 56 0.64 - 86 0 0 -49 48 15 19 44 2.8 12 262 55 -49 52 33 -49 43 58 -49 56 14 -49 40 18 0.64 - 85 0 0 -49 37 20 19 44 3.3 12 261 54 -49 41 38 -49 33 2 -49 45 19 -49 29 21 0.64 - 84 0 0 -49 26 7 19 44 3.8 11 261 54 -49 30 25 -49 21 48 -49 34 7 -49 18 7 0.64 - 83 0 0 -49 14 35 19 44 4.2 10 260 53 -49 18 55 -49 10 16 -49 22 37 -49 6 35 0.65 - 82 0 0 -49 2 46 19 44 4.7 10 259 53 -49 7 6 -48 58 27 -49 10 48 -48 54 45 0.65 - 81 0 0 -48 50 39 19 44 5.0 9 258 52 -48 54 59 -48 46 19 -48 58 42 -48 42 37 0.65 - 80 0 0 -48 38 14 19 44 5.4 8 258 52 -48 42 35 -48 33 54 -48 46 18 -48 30 11 0.65 - 79 0 0 -48 25 32 19 44 5.7 7 257 51 -48 29 53 -48 21 11 -48 33 36 -48 17 28 0.66 - 78 0 0 -48 12 31 19 44 6.1 7 256 51 -48 16 53 -48 8 10 -48 20 37 -48 4 26 0.66 - 77 0 0 -47 59 12 19 44 6.3 6 255 50 -48 3 35 -47 54 51 -48 7 19 -47 51 7 0.67 - 76 0 0 -47 45 36 19 44 6.6 5 255 50 -47 49 58 -47 41 14 -47 53 43 -47 37 29 0.68 - 75 0 0 -47 31 41 19 44 6.8 5 254 49 -47 36 5 -47 27 19 -47 39 50 -47 23 34 0.69 - 74 0 0 -47 17 29 19 44 7.0 4 253 49 -47 21 53 -47 13 6 -47 25 38 -47 9 21 0.70 - 73 0 0 -47 2 59 19 44 7.2 3 252 48 -47 7 23 -46 58 35 -47 11 9 -46 54 50 0.73 - 72 0 0 -46 48 11 19 44 7.3 2 252 48 -46 52 36 -46 43 47 -46 56 22 -46 40 1 0.76 - 71 0 0 -46 33 6 19 44 7.4 2 251 47 -46 37 31 -46 28 41 -46 41 18 -46 24 54 0.82 - 70 0 0 -46 17 42 19 44 7.5 1 250 46 -46 22 8 -46 13 17 -46 25 55 -46 9 30 0.98 - 69 0 0 -46 2 1 19 44 7.5 0 249 46 -46 6 27 -45 57 36 -46 10 15 -45 53 48 2.08 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: UCAC4 379-066424 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 14 40.7963 DE: -14 13 24.142 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 14 40.7965 DE: -14 13 24.143 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.9 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4105) Tsia asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.87240 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.012", 0.003", 103.124° remarks: * orbital elements for (4105)Tsia : Mean anomaly = 309.3953601814 deg Arg. of pericenter = 63.2108435497 deg Long. of node = 204.0553067887 deg Inclination = 6.3671786082 deg Eccentricity = 0.1927277635 Semimajor axis = 2.7020573872 AU Perihelion dist = 2.1812959100 AU Mag: H = 12.88, G = 0.15 Epoch of elements : MJD 60666.82060696 TDT (2024 Dec 22.8206) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,0.35,2024,12,22,19.694564,-0.145580,-0.500243,20.017851,-5.822621,-0.004491,0.001527,-0.000001,0.000000 -173.2644,-14.3390,-115.68,-23.43,False UCAC4 379-066424,14.24466560,-14.2233727,12.30,11.93,11.73,0.0,0,,14.26705626,-14.3390087,6.16,5.91,0,0,0 4105,Tsia,18.09,13.049,2.8724,0,0,4.218,-17.83,,0.8,0 0,309.2133,2024,12,22,63.2108,204.0553,6.3672,0.19273,2.70206,2.18130,12.88,5.0,0.15 1.428,0.0120,0.0026,103,0.0027,Known errors,2.14,0,-1,-1 20241222_066424,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org