IOTA/IOTA-ES occultation update for (2241) Alcathous / TYC 1175-00763-1 event on 2024 Jun 12, 17:46 UT Visible from Summary ------- On 2024 Jun 12 UT, the 115.602 km diameter asteroid (2241) Alcathous will occult a 11.7 mag star in the constellation Pegasus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.01 mag to 16.67 mag (the magnitude of the asteroid) for at most 6.470 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 Jun 12, 17:40 - 2024 Jun 12, 17:52 * geocentric midpoint of event [JD]: 2460474.24037808 * magnitude of target star: 11.67 * magnitude drop [mag]: 5.01 * estimated maximum duration [s]: 6.470 * Moon: 36 % sunlit, 150° distance * Sun: 83° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 116 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.004", 62°) * approx speed of asteroid's shadow [km/s]: 17.8638 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1175-00763-1 by 2241 Alcathous on 2024 Jun 12 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 116 0 0 -52 22 13 17 40 13.6 0 66 -57 .. .. .. -51 47 56 .. .. .. -51 26 50 .... 117 0 0 -52 5 10 17 40 13.6 1 65 -57 -52 39 41 -51 30 40 -53 0 57 -51 9 26 -0.13 118 0 0 -51 47 25 17 40 13.7 1 64 -56 -52 22 9 -51 12 42 -52 43 33 -50 51 20 -0.04 119 0 0 -51 28 56 17 40 13.8 2 63 -56 -52 3 54 -50 54 0 -52 25 26 -50 32 30 -0.01 120 0 0 -51 9 43 17 40 14.0 3 62 -56 -51 44 55 -50 34 33 -52 6 36 -50 12 54 0.01 121 0 0 -50 49 45 17 40 14.3 3 62 -56 -51 25 11 -50 14 20 -51 47 1 -49 52 32 0.01 122 0 0 -50 29 0 17 40 14.6 4 61 -56 -51 4 41 -49 53 20 -51 26 40 -49 31 23 0.02 123 0 0 -50 7 27 17 40 14.9 5 60 -55 -50 43 23 -49 31 31 -51 5 32 -49 9 25 0.02 124 0 0 -49 45 5 17 40 15.3 6 59 -55 -50 21 17 -49 8 53 -50 43 35 -48 46 37 0.03 125 0 0 -49 21 52 17 40 15.8 6 59 -55 -49 58 21 -48 45 24 -50 20 49 -48 22 58 0.03 126 0 0 -48 57 48 17 40 16.4 7 58 -54 -49 34 34 -48 21 3 -49 57 13 -47 58 26 0.03 127 0 0 -48 32 50 17 40 17.0 8 57 -54 -49 9 54 -47 55 48 -49 32 43 -47 33 1 0.03 128 0 0 -48 6 58 17 40 17.8 9 56 -54 -48 44 20 -47 29 38 -49 7 21 -47 6 40 0.03 129 0 0 -47 40 10 17 40 18.5 10 56 -53 -48 17 50 -47 2 32 -48 41 2 -46 39 22 0.04 130 0 0 -47 12 25 17 40 19.4 10 55 -53 -47 50 24 -46 34 27 -48 13 48 -46 11 5 0.04 131 0 0 -46 43 40 17 40 20.4 11 54 -53 -47 21 59 -46 5 23 -47 45 34 -45 41 49 0.04 132 0 0 -46 13 55 17 40 21.5 12 53 -52 -46 52 33 -45 35 18 -47 16 21 -45 11 32 0.04 133 0 0 -45 43 7 17 40 22.6 13 53 -52 -46 22 6 -45 4 10 -46 46 7 -44 40 11 0.04 134 0 0 -45 11 15 17 40 23.9 14 52 -51 -45 50 35 -44 31 57 -46 14 49 -44 7 45 0.04 135 0 0 -44 38 18 17 40 25.3 15 51 -51 -45 17 59 -43 58 38 -45 42 27 -43 34 13 0.04 136 0 0 -44 4 13 17 40 26.8 16 51 -50 -44 44 17 -43 24 11 -45 8 57 -42 59 32 0.04 137 0 0 -43 28 59 17 40 28.4 17 50 -50 -44 9 25 -42 48 34 -44 34 20 -42 23 42 0.04 138 0 0 -42 52 34 17 40 30.1 18 49 -49 -43 33 23 -42 11 46 -43 58 32 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0.04 151 0 0 -32 57 59 17 41 7.3 32 41 -40 -33 44 21 -32 11 39 -34 12 55 -31 43 9 0.04 152 0 0 -32 2 1 17 41 11.5 33 40 -39 -32 48 49 -31 15 14 -33 17 40 -30 46 27 0.04 153 0 0 -31 4 28 17 41 16.0 34 40 -38 -31 51 44 -30 17 15 -32 20 51 -29 48 11 0.04 154 0 0 -30 5 22 17 41 20.7 36 39 -37 -30 53 4 -29 17 42 -31 22 28 -28 48 22 0.04 155 0 0 -29 4 41 17 41 25.7 37 39 -36 -29 52 50 -28 16 35 -30 22 30 -27 46 58 0.04 156 0 0 -28 2 26 17 41 30.9 38 38 -35 -28 51 1 -27 13 53 -29 20 57 -26 44 1 0.04 157 0 0 -26 58 37 17 41 36.4 40 38 -34 -27 47 38 -26 9 39 -28 17 49 -25 39 30 0.04 158 0 0 -25 53 15 17 41 42.1 41 37 -33 -26 42 40 -25 3 51 -27 13 8 -24 33 28 0.04 159 0 0 -24 46 20 17 41 48.2 43 37 -32 -25 36 10 -23 56 32 -26 6 53 -23 25 53 0.04 160 0 0 -23 37 55 17 41 54.5 44 36 -30 -24 28 9 -22 47 43 -24 59 7 -22 16 50 0.04 161 0 0 -22 28 1 17 42 1.1 46 36 -29 -23 18 38 -21 37 26 -23 49 50 -21 6 19 0.04 162 0 0 -21 16 41 17 42 7.9 47 35 -28 -22 7 40 -20 25 44 -22 39 5 -19 54 23 0.04 163 0 0 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36 17 44 0.7 69 28 -10 - 5 4 6 - 3 17 11 - 5 37 5 - 2 44 19 0.05 176 0 0 - 2 47 36 17 44 10.7 70 27 -8 - 3 41 4 - 1 54 13 - 4 14 1 - 1 21 22 0.05 177 0 0 - 1 24 37 17 44 20.9 72 26 -7 - 2 18 1 - 0 31 18 - 2 50 56 0 1 30 0.05 178 0 0 - 0 1 48 17 44 31.2 74 25 -5 - 0 55 6 0 51 25 - 1 27 57 1 24 9 0.05 179 0 0 1 20 44 17 44 41.5 75 24 -4 0 27 34 2 13 48 - 0 5 12 2 46 27 0.05 -180 0 0 2 42 50 17 44 51.9 77 22 -2 1 49 51 3 35 45 1 17 11 4 8 17 0.06 -179 0 0 4 4 25 17 45 2.3 79 20 -1 3 11 38 4 57 7 2 39 5 5 29 32 0.06 -178 0 0 5 25 20 17 45 12.7 80 17 1 4 32 47 6 17 49 4 0 23 6 50 5 0.06 -177 0 0 6 45 29 17 45 23.1 82 13 2 5 53 12 7 37 42 5 20 57 8 9 49 0.06 -176 0 0 8 4 46 17 45 33.5 83 7 3 7 12 46 8 56 41 6 40 42 9 28 37 0.06 -175 0 0 9 23 4 17 45 43.8 85 358 5 8 31 22 10 14 40 7 59 30 10 46 25 0.06 -174 0 0 10 40 18 17 45 54.0 86 344 6 9 48 56 11 31 34 9 17 16 12 3 6 0.06 -173 0 0 11 56 22 17 46 4.1 86 323 8 11 5 23 12 47 17 10 33 56 13 18 36 0.06 -172 0 0 13 11 13 17 46 14.1 86 297 9 12 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51 50.3 16 274 63 48 55 36 49 58 8 48 36 20 50 17 22 0.06 - 94 0 0 49 24 52 17 51 51.5 16 274 63 48 53 34 49 56 9 48 34 18 50 15 24 0.06 - 93 0 0 49 22 19 17 51 52.5 15 275 64 48 50 59 49 53 37 48 31 41 50 12 53 0.06 - 92 0 0 49 19 12 17 51 53.6 14 276 64 48 47 50 49 50 32 48 28 31 50 9 49 0.06 - 91 0 0 49 15 31 17 51 54.6 14 277 64 48 44 7 49 46 54 48 24 47 50 6 13 0.06 - 90 0 0 49 11 17 17 51 55.6 13 277 64 48 39 50 49 42 43 48 20 28 50 2 3 0.06 - 89 0 0 49 6 29 17 51 56.5 12 278 64 48 34 59 49 37 58 48 15 35 49 57 21 0.06 - 88 0 0 49 1 8 17 51 57.4 12 279 64 48 29 34 49 32 40 48 10 8 49 52 5 0.06 - 87 0 0 48 55 12 17 51 58.2 11 280 64 48 23 34 49 26 48 48 4 5 49 46 15 0.06 - 86 0 0 48 48 41 17 51 59.0 10 280 64 48 16 59 49 20 22 47 57 28 49 39 52 0.06 - 85 0 0 48 41 36 17 51 59.7 10 281 64 48 9 49 49 13 21 47 50 15 49 32 54 0.05 - 84 0 0 48 33 55 17 52 0.4 9 282 64 48 2 3 49 5 46 47 42 26 49 25 22 0.05 - 83 0 0 48 25 39 17 52 1.1 8 283 64 47 53 42 48 57 35 47 34 1 49 17 14 0.05 - 82 0 0 48 16 47 17 52 1.7 8 283 64 47 44 44 48 48 49 47 24 59 49 8 32 0.05 - 81 0 0 48 7 19 17 52 2.3 7 284 64 47 35 9 48 39 27 47 15 21 48 59 13 0.05 - 80 0 0 47 57 13 17 52 2.8 6 285 64 47 24 57 48 29 28 47 5 4 48 49 19 0.05 - 79 0 0 47 46 31 17 52 3.2 6 286 64 47 14 7 48 18 52 46 54 10 48 38 48 0.05 - 78 0 0 47 35 10 17 52 3.6 5 286 64 47 2 39 48 7 39 46 42 38 48 27 39 0.05 - 77 0 0 47 23 11 17 52 4.0 4 287 64 46 50 33 47 55 48 46 30 26 48 15 53 0.04 - 76 0 0 47 10 33 17 52 4.3 4 288 64 46 37 47 47 43 19 46 17 35 48 3 28 0.04 - 75 0 0 46 57 16 17 52 4.6 3 288 64 46 24 20 47 30 10 46 4 3 47 50 25 0.03 - 74 0 0 46 43 18 17 52 4.8 2 289 64 46 10 14 47 16 21 45 49 51 47 36 42 0.02 - 73 0 0 46 28 39 17 52 4.9 1 290 64 45 55 25 47 1 52 45 34 57 47 22 18 0.01 - 72 0 0 46 13 19 17 52 5.0 1 291 64 45 39 55 46 46 41 45 19 21 47 7 14 -0.05 - 71 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 46 30 49 .. .. .. 46 51 28 .... Uncertainty in time = +/- 5 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: TYC 1175-00763-1 * constellation : Pegasus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 23 30 04.5446 DE: +14 33 16.830 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 23 30 04.5448 DE: +14 33 16.832 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.7 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2241) Alcathous asteroid class: approx. diameter [km]: 116 approx. diameter ["]: 0.029 distance from Earth [AU]: 5.48450 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#83 date of fit: 2023 Apr 27 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", 0.004", 62.4° remarks: * orbital elements for (2241)Alcathous : Mean anomaly = 143.8302509368 deg Arg. of pericenter = 292.3884625231 deg Long. of node = 267.9898077398 deg Inclination = 16.6267726584 deg Eccentricity = 0.0658785895 Semimajor axis = 5.1745742219 AU Perihelion dist = 4.8336805711 AU Mag: H = 8.62, G = 0.15 Epoch of elements : MJD 60473.74037784 TDT (2024 Jun 12.7404) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#832023Apr27,6.47,2024,6,12,17.769074,0.046165,-0.039063,6.305724,7.867769,-0.005340,-0.002197,0.000000,0.000000 -175.2520,14.6872,-86.52,23.21,False TYC 1175-00763-1,23.50126237,14.5546750,12.02,11.67,11.48,0.0,0,,23.52173923,14.6872446,5.01,4.76,0,0,0 2241,Alcathous,16.67,115.602,5.4845,0,0,0.697,12.62,,7.0,0 0,143.7683,2024,6,12,292.3885,267.9898,16.6268,0.06588,5.17457,4.83368,8.62,5.0,0.15 1.308,0.0207,0.0037,62,0.0090,Known errors,1.39,0,-1,-1 20240612_0763-1,60139.38 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 09:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org