IOTA/IOTA-ES occultation update for (657) Gunlod / TYC 1176-00871-1 event on 2024 Oct 07, 14:02 UT Visible from Summary ------- On 2024 Oct 07 UT, the 37.861 km diameter asteroid (657) Gunlod will occult a 11.1 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 4.38 mag to 15.42 mag (the magnitude of the asteroid) for at most 2.970 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: 100 * date and approx. time of event: 2024 Oct 07, 13:58 - 2024 Oct 07, 14:06 * geocentric midpoint of event [JD]: 2460591.08532775 * magnitude of target star: 11.06 * magnitude drop [mag]: 4.38 * estimated maximum duration [s]: 2.970 * Moon: 20 % sunlit, 116° distance * Sun: 162° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 89 * 1 sigma uncertainty interval [path widths]: +/- 0.09 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 63°) * approx speed of asteroid's shadow [km/s]: 12.7314 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1176-00871-1 by 657 Gunlod on 2024 Oct 7 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 ' " Longitude Longitude Longitude Longitude 131 32 6 -75 0 0 14 6 21.8 1 357 -9 129 58 18 133 7 25 129 41 12 133 25 8 .... 131 30 0 -74 0 0 14 6 21.4 2 357 -10 130 1 52 132 59 28 129 45 47 133 16 4 -1.37 131 35 58 -73 0 0 14 6 20.7 3 357 -11 130 12 43 133 0 25 129 57 32 133 16 5 1.69 131 48 46 -72 0 0 14 6 19.6 4 357 -12 130 29 46 133 8 51 130 15 21 133 23 42 1.83 132 7 24 -71 0 0 14 6 18.1 5 357 -13 130 52 7 133 23 41 130 38 22 133 37 50 1.91 132 31 6 -70 0 0 14 6 16.3 6 356 -14 131 19 5 133 44 2 131 5 56 133 57 33 1.96 132 59 15 -69 0 0 14 6 14.1 7 356 -15 131 50 8 134 9 14 131 37 31 134 22 13 1.99 133 31 23 -68 0 0 14 6 11.5 8 355 -16 132 24 51 134 38 45 132 12 41 134 51 15 2.02 134 7 8 -67 0 0 14 6 8.6 9 355 -17 133 2 52 135 12 11 132 51 8 135 24 14 2.04 134 46 11 -66 0 0 14 6 5.2 10 354 -18 133 43 57 135 49 9 133 32 35 136 0 49 2.06 135 28 16 -65 0 0 14 6 1.5 10 353 -19 134 27 52 136 29 24 134 16 49 136 40 44 2.07 136 13 13 -64 0 0 14 5 57.4 11 353 -20 135 14 26 137 12 42 135 3 42 137 23 44 2.08 137 0 53 -63 0 0 14 5 52.9 12 352 -21 136 3 33 137 58 55 135 53 4 138 9 41 2.09 137 51 10 -62 0 0 14 5 48.0 13 351 -22 136 55 6 138 47 54 136 44 51 138 58 25 2.10 138 43 57 -61 0 0 14 5 42.7 14 350 -23 137 49 1 139 39 33 137 38 59 139 49 52 2.11 139 39 14 -60 0 0 14 5 36.9 15 349 -24 138 45 17 140 33 50 138 35 26 140 43 58 2.11 140 36 57 -59 0 0 14 5 30.8 16 348 -25 139 43 52 141 30 42 139 34 11 141 40 40 2.12 141 37 8 -58 0 0 14 5 24.2 17 347 -26 140 44 47 142 30 10 140 35 14 142 40 0 2.12 142 39 48 -57 0 0 14 5 17.2 18 346 -27 141 48 4 143 32 13 141 38 37 143 41 56 2.12 143 44 59 -56 0 0 14 5 9.7 19 345 -28 142 53 44 144 36 55 142 44 23 144 46 34 2.13 144 52 46 -55 0 0 14 5 1.8 19 344 -29 144 1 54 145 44 21 143 52 37 145 53 55 2.13 146 3 15 -54 0 0 14 4 53.4 20 342 -30 145 12 38 146 54 36 145 3 24 147 4 8 2.13 147 16 34 -53 0 0 14 4 44.5 21 341 -31 146 26 5 148 7 49 146 16 52 148 17 20 2.13 148 32 52 -52 0 0 14 4 35.1 22 340 -32 147 42 23 149 24 8 147 33 10 149 33 40 2.14 149 52 20 -51 0 0 14 4 25.3 22 338 -33 149 1 43 150 43 47 148 52 29 150 53 21 2.14 151 15 13 -50 0 0 14 4 14.8 23 337 -34 150 24 19 152 7 1 150 15 3 152 16 38 2.14 152 41 50 -49 0 0 14 4 3.9 23 335 -35 151 50 28 153 34 8 151 41 7 153 43 51 2.14 154 12 30 -48 0 0 14 3 52.3 24 334 -36 153 20 30 155 5 31 153 11 3 155 15 24 2.14 155 47 42 -47 0 0 14 3 40.1 24 332 -37 154 54 50 156 41 40 154 45 14 156 51 44 2.14 157 27 59 -46 0 0 14 3 27.3 25 330 -37 156 33 59 158 23 12 156 24 11 158 33 30 2.14 159 14 2 -45 0 0 14 3 13.8 25 328 -38 158 18 36 160 10 52 158 8 33 160 21 29 2.15 161 6 49 -44 0 0 14 2 59.5 25 326 -38 160 9 31 162 5 43 159 59 8 162 16 44 2.15 163 7 31 -43 0 0 14 2 44.4 25 324 -39 162 7 49 164 9 7 161 57 1 164 20 40 2.15 Latitude Latitude Latitude Latitude 164 0 0 -42 35 15 14 2 37.8 25 323 -39 -42 6 50 -43 4 17 -42 1 40 -43 9 41 2.15 165 0 0 -42 7 56 14 2 30.4 25 322 -39 -41 39 52 -42 36 35 -41 34 46 -42 41 55 2.15 166 0 0 -41 41 39 14 2 23.1 25 321 -39 -41 13 55 -42 9 56 -41 8 52 -42 15 13 2.15 167 0 0 -41 16 23 14 2 15.9 25 320 -39 -40 48 58 -41 44 21 -40 43 58 -41 49 33 2.15 168 0 0 -40 52 8 14 2 8.7 24 319 -39 -40 25 0 -41 19 47 -40 20 4 -41 24 56 2.15 169 0 0 -40 28 53 14 2 1.6 24 318 -39 -40 2 2 -40 56 15 -39 57 9 -41 1 21 2.15 170 0 0 -40 6 39 14 1 54.6 24 317 -39 -39 40 3 -40 33 44 -39 35 13 -40 38 47 2.15 171 0 0 -39 45 24 14 1 47.7 24 316 -39 -39 19 3 -40 12 14 -39 14 15 -40 17 14 2.15 172 0 0 -39 25 8 14 1 40.8 23 315 -39 -38 59 1 -39 51 44 -38 54 15 -39 56 41 2.15 173 0 0 -39 5 51 14 1 34.1 23 314 -39 -38 39 56 -39 32 14 -38 35 13 -39 37 8 2.15 174 0 0 -38 47 33 14 1 27.5 23 313 -39 -38 21 50 -39 13 43 -38 17 9 -39 18 35 2.15 175 0 0 -38 30 13 14 1 21.1 22 312 -39 -38 4 41 -38 56 12 -38 0 1 -39 1 2 2.16 176 0 0 -38 13 51 14 1 14.7 22 311 -38 -37 48 29 -38 39 39 -37 43 51 -38 44 27 2.16 177 0 0 -37 58 27 14 1 8.5 22 310 -38 -37 33 14 -38 24 5 -37 28 39 -38 28 51 2.16 178 0 0 -37 44 1 14 1 2.4 21 309 -38 -37 18 57 -38 9 30 -37 14 23 -38 14 14 2.16 179 0 0 -37 30 32 14 0 56.4 21 309 -37 -37 5 36 -37 55 52 -37 1 3 -38 0 35 2.16 180 0 0 -37 18 0 14 0 50.6 20 308 -37 -36 53 11 -37 43 13 -36 48 40 -37 47 54 2.16 -179 0 0 -37 6 25 14 0 44.9 20 307 -37 -36 41 43 -37 31 31 -36 37 13 -37 36 11 2.16 -178 0 0 -36 55 47 14 0 39.4 19 306 -36 -36 31 11 -37 20 47 -36 26 42 -37 25 26 2.17 -177 0 0 -36 46 7 14 0 34.0 19 305 -36 -36 21 36 -37 11 1 -36 17 8 -37 15 38 2.17 -176 0 0 -36 37 23 14 0 28.8 18 305 -35 -36 12 57 -37 2 12 -36 8 30 -37 6 49 2.17 -175 0 0 -36 29 36 14 0 23.7 18 304 -35 -36 5 14 -36 54 21 -36 0 47 -36 58 56 2.17 -174 0 0 -36 22 46 14 0 18.9 17 303 -34 -35 58 27 -36 47 27 -35 54 1 -36 52 2 2.18 -173 0 0 -36 16 52 14 0 14.1 16 302 -34 -35 52 37 -36 41 30 -35 48 12 -36 46 5 2.18 -172 0 0 -36 11 56 14 0 9.6 16 302 -33 -35 47 43 -36 36 31 -35 43 18 -36 41 5 2.18 -171 0 0 -36 7 56 14 0 5.2 15 301 -32 -35 43 45 -36 32 30 -35 39 20 -36 37 4 2.18 -170 0 0 -36 4 53 14 0 1.0 14 300 -32 -35 40 43 -36 29 26 -35 36 19 -36 33 59 2.19 -169 0 0 -36 2 48 13 59 57.0 14 300 -31 -35 38 38 -36 27 19 -35 34 14 -36 31 53 2.19 -168 0 0 -36 1 39 13 59 53.2 13 299 -31 -35 37 30 -36 26 11 -35 33 5 -36 30 44 2.20 -167 0 0 -36 1 28 13 59 49.6 12 298 -30 -35 37 18 -36 26 0 -35 32 53 -36 30 33 2.20 -166 0 0 -36 2 14 13 59 46.2 12 298 -29 -35 38 2 -36 26 47 -35 33 38 -36 31 20 2.21 -165 0 0 -36 3 57 13 59 42.9 11 297 -29 -35 39 44 -36 28 32 -35 35 19 -36 33 6 2.21 -164 0 0 -36 6 38 13 59 39.9 10 296 -28 -35 42 23 -36 31 16 -35 37 58 -36 35 50 2.22 -163 0 0 -36 10 17 13 59 37.1 9 296 -27 -35 45 59 -36 34 57 -35 41 33 -36 39 32 2.22 -162 0 0 -36 14 54 13 59 34.5 9 295 -26 -35 50 33 -36 39 38 -35 46 6 -36 44 14 2.23 -161 0 0 -36 20 29 13 59 32.1 8 294 -26 -35 56 4 -36 45 18 -35 51 37 -36 49 54 2.24 -160 0 0 -36 27 3 13 59 29.9 7 294 -25 -36 2 33 -36 51 57 -35 58 5 -36 56 34 2.25 -159 0 0 -36 34 36 13 59 27.9 6 293 -24 -36 10 1 -36 59 35 -36 5 32 -37 4 14 2.27 -158 0 0 -36 43 8 13 59 26.2 6 293 -23 -36 18 27 -37 8 13 -36 13 57 -37 12 53 2.28 -157 0 0 -36 52 40 13 59 24.7 5 292 -23 -36 27 52 -37 17 52 -36 23 21 -37 22 33 2.31 -156 0 0 -37 3 11 13 59 23.4 4 291 -22 -36 38 16 -37 28 31 -36 33 44 -37 33 13 2.34 -155 0 0 -37 14 43 13 59 22.4 3 291 -21 -36 49 40 -37 40 11 -36 45 6 -37 44 55 2.38 -154 0 0 -37 27 15 13 59 21.6 2 290 -20 -37 2 3 -37 52 53 -36 57 28 -37 57 38 2.46 -153 0 0 -37 40 49 13 59 21.0 2 290 -19 -37 15 27 -38 6 36 -37 10 50 -38 11 24 2.62 -152 0 0 -37 55 24 13 59 20.7 1 289 -19 -37 29 52 -38 21 22 -37 25 13 -38 26 11 3.15 -151 0 0 .. .. .... .. .. .. .. .. .. -37 45 18 .. .. .. -37 40 37 .. .. .. .... Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 1176-00871-1 * constellation : Pegasus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 23 46 45.4388 DE: +14 20 37.947 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 23 46 45.4387 DE: +14 20 37.947 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.1 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (657) Gunlod asteroid class: approx. diameter [km]: 38 approx. diameter ["]: 0.027 distance from Earth [AU]: 1.93940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#108 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): 0.014", 0.002", 63.241° remarks: * orbital elements for (657)Gunlod : Mean anomaly = 186.4904678260 deg Arg. of pericenter = 244.4144897840 deg Long. of node = 297.5241718456 deg Inclination = 10.2383666797 deg Eccentricity = 0.1132980810 Semimajor axis = 2.6102602422 AU Perihelion dist = 2.3145227658 AU Mag: H = 11.18, G = 0.15 Epoch of elements : MJD 60590.58532737 TDT (2024 Oct 07.5853) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1082023Apr24,2.97,2024,10,7,14.047866,0.390090,-0.816517,-6.484214,-3.097253,0.001673,-0.000799,0.000001,0.000001 129.5803,14.4837,-33.80,-5.83,False TYC 1176-00871-1,23.77928855,14.3438742,11.55,11.06,10.80,0.0,0,,23.80056107,14.4836546,4.38,4.20,0,0,0 657,Gunlod,15.42,37.861,1.9394,0,0,-2.024,-14.04,,1.8,0 0,186.3537,2024,10,7,244.4145,297.5242,10.2384,0.11330,2.61026,2.31452,11.18,5.0,0.15 1.092,0.0137,0.0025,63,0.0025,Known errors,1.16,0,-1,-1 20241007_0871-1,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org