IOTA/IOTA-ES occultation update for (189) Phthia / TYC 1232-01073-1 event on 2024 Oct 25, 09:01 UT Visible from Summary ------- On 2024 Oct 25 UT, the 40.116 km diameter asteroid (189) Phthia will occult a 11.6 mag star in the constellation Aries for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.34 mag to 12.53 mag (the magnitude of the asteroid) for at most 4.300 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 Oct 25, 08:50 - 2024 Oct 25, 09:11 * geocentric midpoint of event [JD]: 2460608.87573183 * magnitude of target star: 11.56 * magnitude drop [mag]: 1.34 * estimated maximum duration [s]: 4.300 * Moon: 40 % sunlit, 83° distance * Sun: 161° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 43 * 1 sigma uncertainty interval [path widths]: +/- 0.26 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.005", 81°) * approx speed of asteroid's shadow [km/s]: 9.3344 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1232-01073-1 by 189 Phthia on 2024 Oct 25 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 150 0 0 - 5 10 21 9 11 38.0 1 75 -20 - 4 58 14 - 5 22 27 - 4 51 50 - 5 28 49 .... 151 0 0 - 4 53 8 9 11 37.7 2 75 -21 - 4 41 0 - 5 5 16 - 4 34 35 - 5 11 39 -0.33 152 0 0 - 4 35 22 9 11 37.1 3 74 -22 - 4 23 12 - 4 47 32 - 4 16 46 - 4 53 56 -0.35 153 0 0 - 4 17 3 9 11 36.3 4 74 -23 - 4 4 51 - 4 29 14 - 3 58 25 - 4 35 40 -0.36 154 0 0 - 3 58 11 9 11 35.3 5 74 -24 - 3 45 58 - 4 10 24 - 3 39 30 - 4 16 50 -0.36 155 0 0 - 3 38 47 9 11 34.0 6 74 -25 - 3 26 31 - 3 51 1 - 3 20 2 - 3 57 29 -0.37 156 0 0 - 3 18 50 9 11 32.5 7 74 -26 - 3 6 32 - 3 31 6 - 3 0 2 - 3 37 34 -0.37 157 0 0 - 2 58 20 9 11 30.7 8 74 -27 - 2 46 1 - 3 10 38 - 2 39 30 - 3 17 8 -0.37 158 0 0 - 2 37 19 9 11 28.7 9 74 -28 - 2 24 57 - 2 49 39 - 2 18 26 - 2 56 9 -0.37 159 0 0 - 2 15 45 9 11 26.4 10 74 -29 - 2 3 22 - 2 28 8 - 1 56 49 - 2 34 39 -0.37 160 0 0 - 1 53 41 9 11 23.9 11 74 -31 - 1 41 15 - 2 6 5 - 1 34 42 - 2 12 37 -0.37 161 0 0 - 1 31 5 9 11 21.2 12 74 -32 - 1 18 38 - 1 43 31 - 1 12 3 - 1 50 5 -0.37 162 0 0 - 1 7 58 9 11 18.1 13 74 -33 - 0 55 29 - 1 20 27 - 0 48 53 - 1 27 1 -0.37 163 0 0 - 0 44 21 9 11 14.9 14 74 -34 - 0 31 50 - 0 56 52 - 0 25 13 - 1 3 27 -0.37 164 0 0 - 0 20 14 9 11 11.4 15 74 -35 - 0 7 40 - 0 32 46 - 0 1 2 - 0 39 23 -0.37 165 0 0 0 4 23 9 11 7.6 17 74 -36 0 16 59 - 0 8 12 0 23 38 - 0 14 49 -0.37 166 0 0 0 29 29 9 11 3.6 18 74 -37 0 42 7 0 16 53 0 48 48 0 10 14 -0.37 167 0 0 0 55 5 9 10 59.3 19 74 -38 1 7 45 0 42 26 1 14 26 0 35 46 -0.38 168 0 0 1 21 9 9 10 54.8 20 74 -39 1 33 51 1 8 28 1 40 33 1 1 47 -0.38 169 0 0 1 47 41 9 10 50.0 21 74 -40 2 0 25 1 34 57 2 7 9 1 28 15 -0.38 170 0 0 2 14 40 9 10 45.0 22 74 -41 2 27 26 2 1 55 2 34 11 1 55 11 -0.38 171 0 0 2 42 7 9 10 39.7 23 75 -42 2 54 55 2 29 19 3 1 41 2 22 35 -0.38 172 0 0 3 10 0 9 10 34.2 24 75 -43 3 22 51 2 57 10 3 29 38 2 50 25 -0.38 173 0 0 3 38 19 9 10 28.5 25 75 -44 3 51 12 3 25 27 3 58 0 3 18 40 -0.38 174 0 0 4 7 3 9 10 22.5 26 75 -45 4 19 59 3 54 10 4 26 48 3 47 22 -0.38 175 0 0 4 36 13 9 10 16.3 27 75 -46 4 49 10 4 23 17 4 56 1 4 16 28 -0.38 176 0 0 5 5 46 9 10 9.8 28 75 -47 5 18 46 4 52 48 5 25 38 4 45 58 -0.38 177 0 0 5 35 44 9 10 3.1 29 76 -49 5 48 45 5 22 43 5 55 38 5 15 52 -0.38 178 0 0 6 6 4 9 9 56.1 30 76 -50 6 19 8 5 53 1 6 26 2 5 46 9 -0.38 179 0 0 6 36 46 9 9 48.9 31 76 -51 6 49 52 6 23 42 6 56 47 6 16 48 -0.38 -180 0 0 7 7 50 9 9 41.5 32 76 -52 7 20 58 6 54 43 7 27 54 6 47 49 -0.38 -179 0 0 7 39 15 9 9 33.9 33 77 -53 7 52 25 7 26 6 7 59 22 7 19 10 -0.38 -178 0 0 8 10 59 9 9 26.0 35 77 -54 8 24 11 7 57 48 8 31 10 7 50 52 -0.38 -177 0 0 8 43 3 9 9 18.0 36 77 -55 8 56 17 8 29 50 9 3 17 8 22 52 -0.38 -176 0 0 9 15 26 9 9 9.7 37 78 -56 9 28 42 9 2 11 9 35 42 8 55 12 -0.38 -175 0 0 9 48 5 9 9 1.2 38 78 -57 10 1 24 9 34 49 10 8 25 9 27 49 -0.38 -174 0 0 10 21 2 9 8 52.5 39 79 -58 10 34 22 10 7 43 10 41 25 10 0 42 -0.38 -173 0 0 10 54 15 9 8 43.6 40 79 -59 11 7 37 10 40 54 11 14 41 10 33 52 -0.38 -172 0 0 11 27 42 9 8 34.5 41 80 -60 11 41 6 11 14 20 11 48 11 11 7 17 -0.38 -171 0 0 12 1 24 9 8 25.2 42 80 -61 12 14 50 11 48 0 12 21 56 11 40 56 -0.38 -170 0 0 12 35 19 9 8 15.8 43 81 -62 12 48 47 12 21 53 12 55 53 12 14 48 -0.38 -169 0 0 13 9 26 9 8 6.2 44 81 -63 13 22 56 12 55 59 13 30 3 12 48 53 -0.38 -168 0 0 13 43 45 9 7 56.3 45 82 -64 13 57 16 13 30 16 14 4 24 13 23 9 -0.38 -167 0 0 14 18 14 9 7 46.4 46 83 -65 14 31 46 14 4 43 14 38 56 13 57 36 -0.38 -166 0 0 14 52 52 9 7 36.2 47 83 -65 15 6 26 14 39 20 15 13 36 14 32 12 -0.38 -165 0 0 15 27 39 9 7 25.9 48 84 -66 15 41 14 15 14 5 15 48 25 15 6 56 -0.38 -164 0 0 16 2 33 9 7 15.5 49 85 -67 16 16 10 15 48 58 16 23 22 15 41 48 -0.38 -163 0 0 16 37 34 9 7 5.0 50 86 -68 16 51 12 16 23 57 16 58 24 16 16 47 -0.38 -162 0 0 17 12 40 9 6 54.3 51 87 -69 17 26 19 16 59 2 17 33 32 16 51 50 -0.38 -161 0 0 17 47 50 9 6 43.4 52 88 -70 18 1 31 17 34 11 18 8 44 17 26 59 -0.38 -160 0 0 18 23 4 9 6 32.5 53 89 -70 18 36 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52 29 57 52 59 30 52 23 47 -0.40 - 45 0 0 52 38 34 8 51 28.0 23 265 -9 52 50 16 52 26 53 52 56 27 52 20 43 -0.40 - 44 0 0 52 35 9 8 51 25.0 22 266 -8 52 46 52 52 23 28 52 53 3 52 17 18 -0.40 - 43 0 0 52 31 24 8 51 22.1 22 267 -7 52 43 7 52 19 42 52 49 19 52 13 31 -0.40 - 42 0 0 52 27 17 8 51 19.3 21 268 -7 52 39 1 52 15 34 52 45 13 52 9 24 -0.40 - 41 0 0 52 22 49 8 51 16.5 20 269 -6 52 34 34 52 11 6 52 40 46 52 4 55 -0.40 - 40 0 0 52 18 0 8 51 13.8 20 270 -6 52 29 46 52 6 16 52 35 58 52 0 4 -0.40 - 39 0 0 52 12 49 8 51 11.2 19 270 -5 52 24 36 52 1 4 52 30 49 51 54 52 -0.40 - 38 0 0 52 7 17 8 51 8.6 19 271 -4 52 19 4 51 55 31 52 25 18 51 49 18 -0.40 - 37 0 0 52 1 23 8 51 6.1 18 272 -4 52 13 11 51 49 36 52 19 25 51 43 23 -0.40 - 36 0 0 51 55 7 8 51 3.7 17 273 -3 52 6 56 51 43 19 52 13 11 51 37 5 -0.40 - 35 0 0 51 48 29 8 51 1.3 17 274 -3 52 0 19 51 36 40 52 6 35 51 30 26 -0.40 - 34 0 0 51 41 29 8 50 59.0 16 274 -2 51 53 20 51 29 38 51 59 36 51 23 24 -0.40 - 33 0 0 51 34 6 8 50 56.8 16 275 -1 51 45 59 51 22 14 51 52 16 51 15 59 -0.40 - 32 0 0 51 26 21 8 50 54.7 15 276 -1 51 38 15 51 14 28 51 44 32 51 8 12 -0.41 - 31 0 0 51 18 13 8 50 52.6 14 277 0 51 30 9 51 6 19 51 36 27 51 0 2 -0.41 - 30 0 0 51 9 42 8 50 50.6 14 278 1 51 21 39 50 57 47 51 27 58 50 51 29 -0.41 - 29 0 0 51 0 49 8 50 48.7 13 278 1 51 12 47 50 48 51 51 19 6 50 42 33 -0.41 - 28 0 0 50 51 31 8 50 46.9 12 279 2 51 3 31 50 39 33 51 9 51 50 33 14 -0.41 - 27 0 0 50 41 51 8 50 45.2 12 280 3 50 53 52 50 29 50 51 0 13 50 23 31 -0.41 - 26 0 0 50 31 46 8 50 43.5 11 281 3 50 43 49 50 19 44 50 50 11 50 13 24 -0.41 - 25 0 0 50 21 18 8 50 41.9 10 281 4 50 33 22 50 9 14 50 39 45 50 2 53 -0.41 - 24 0 0 50 10 25 8 50 40.4 10 282 4 50 22 31 49 58 20 50 28 55 49 51 57 -0.41 - 23 0 0 49 59 8 8 50 39.0 9 283 5 50 11 16 49 47 1 50 17 41 49 40 38 -0.41 - 22 0 0 49 47 26 8 50 37.7 8 284 6 49 59 36 49 35 18 50 6 2 49 28 53 -0.42 - 21 0 0 49 35 20 8 50 36.5 8 284 6 49 47 32 49 23 9 49 53 58 49 16 44 -0.42 - 20 0 0 49 22 48 8 50 35.3 7 285 7 49 35 2 49 10 36 49 41 30 49 4 9 -0.42 - 19 0 0 49 9 51 8 50 34.3 6 286 8 49 22 7 48 57 37 49 28 36 48 51 9 -0.43 - 18 0 0 48 56 29 8 50 33.4 6 287 9 49 8 47 48 44 12 49 15 16 48 37 44 -0.43 - 17 0 0 48 42 40 8 50 32.5 5 287 9 48 55 0 48 30 21 49 1 31 48 23 52 -0.44 - 16 0 0 48 28 26 8 50 31.8 4 288 10 48 40 48 48 16 5 48 47 20 48 9 34 -0.45 - 15 0 0 48 13 45 8 50 31.1 4 289 11 48 26 9 48 1 22 48 32 42 47 54 50 -0.46 - 14 0 0 47 58 37 8 50 30.6 3 290 11 48 11 3 47 46 12 48 17 38 47 39 39 -0.48 - 13 0 0 47 43 3 8 50 30.2 2 290 12 47 55 31 47 30 35 48 2 7 47 24 1 -0.51 - 12 0 0 47 27 1 8 50 29.9 1 291 13 47 39 32 47 14 31 47 46 9 47 7 56 -0.57 - 11 0 0 47 10 32 8 50 29.7 1 292 13 47 23 5 46 58 0 47 29 43 46 51 23 -0.78 - 10 0 0 .. .. .... .. .. .. .. .. .. 47 6 11 .. .. .. 47 12 50 .. .. .. .... Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 1232-01073-1 * constellation : Aries * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 18 14.2797 DE: +15 10 47.054 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 18 14.2797 DE: +15 10 47.054 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.6 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (189) Phthia asteroid class: approx. diameter [km]: 40 approx. diameter ["]: 0.039 distance from Earth [AU]: 1.41170 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#102 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): 0.028", 0.005", 81.326° remarks: * orbital elements for (189)Phthia : Mean anomaly = 28.1671085693 deg Arg. of pericenter = 169.8237868806 deg Long. of node = 203.3404710466 deg Inclination = 5.1750857263 deg Eccentricity = 0.0363782995 Semimajor axis = 2.4508356861 AU Perihelion dist = 2.3616784516 AU Mag: H = 9.35, G = 0.15 Epoch of elements : MJD 60608.37572921 TDT (2024 Oct 25.3757) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1022023Apr24,4.30,2024,10,25,9.017564,-0.169354,0.328761,-4.683542,-2.412970,-0.001885,-0.000216,0.000001,0.000000 -119.5983,15.2723,40.74,-12.32,False TYC 1232-01073-1,3.30396658,15.1797371,11.60,11.56,11.54,0.0,0,,3.32736107,15.2723126,1.34,1.05,0,0,0 189,Phthia,12.53,40.116,1.4117,0,0,-2.017,-15.03,,2.2,0 0,28.0706,2024,10,25,169.8238,203.3405,5.1751,0.03638,2.45084,2.36168,9.34,5.0,0.15 1.264,0.0283,0.0053,81,0.0103,Known errors,1.24,0,-1,-1 20241025_1073-1,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org