IOTA/IOTA-ES occultation update for (10944) 1999 FJ26 / TYC 5778-01524-1 event on 2024 Oct 28, 00:41 UT Visible from Summary ------- On 2024 Oct 28 UT, the 15.071 km diameter asteroid (10944) 1999 FJ26 will occult a 10.7 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.01 mag to 17.74 mag (the magnitude of the asteroid) for at most 1.040 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: 98 * date and approx. time of event: 2024 Oct 28, 00:36 - 2024 Oct 28, 00:46 * geocentric midpoint of event [JD]: 2460611.52900562 * magnitude of target star: 10.73 * magnitude drop [mag]: 7.01 * estimated maximum duration [s]: 1.040 * Moon: 17 % sunlit, 146° distance * Sun: 99° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.003", 70°) * approx speed of asteroid's shadow [km/s]: 14.4359 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5778-01524-1 by 10944 1999 FJ26 on 2024 Oct 28 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 161 0 0 -55 38 40 0 36 45.5 0 111 47 -55 45 8 .. .. .. -55 49 51 .. .. .. .... 162 0 0 -55 52 1 0 36 45.5 1 111 47 -55 58 29 -55 45 34 -56 3 11 -55 40 54 0.80 163 0 0 -56 5 10 0 36 45.6 1 110 47 -56 11 37 -55 58 44 -56 16 19 -55 54 4 0.94 164 0 0 -56 18 8 0 36 45.8 2 109 47 -56 24 34 -56 11 42 -56 29 16 -56 7 2 0.99 165 0 0 -56 30 53 0 36 46.1 2 108 47 -56 37 19 -56 24 28 -56 42 0 -56 19 49 1.01 166 0 0 -56 43 27 0 36 46.4 3 107 47 -56 49 53 -56 37 2 -56 54 33 -56 32 23 1.03 167 0 0 -56 55 49 0 36 46.8 4 107 46 -57 2 14 -56 49 25 -57 6 54 -56 44 46 1.04 168 0 0 -57 7 59 0 36 47.2 4 106 46 -57 14 23 -57 1 35 -57 19 3 -56 56 57 1.04 169 0 0 -57 19 56 0 36 47.8 5 105 46 -57 26 20 -57 13 33 -57 31 0 -57 8 56 1.05 170 0 0 -57 31 42 0 36 48.3 5 104 46 -57 38 5 -57 25 20 -57 42 44 -57 20 42 1.05 171 0 0 -57 43 15 0 36 49.0 6 103 45 -57 49 38 -57 36 53 -57 54 16 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29 0 0 -45 8 57 0 45 32.7 27 280 -30 -45 15 30 -45 2 26 -45 20 16 -44 57 42 1.10 - 28 0 0 -44 50 54 0 45 36.6 26 279 -31 -44 57 26 -44 44 23 -45 2 12 -44 39 39 1.10 - 27 0 0 -44 32 52 0 45 40.5 25 278 -31 -44 39 24 -44 26 21 -44 44 9 -44 21 38 1.10 - 26 0 0 -44 14 52 0 45 44.2 25 277 -32 -44 21 24 -44 8 21 -44 26 9 -44 3 38 1.10 - 25 0 0 -43 56 54 0 45 47.9 24 276 -32 -44 3 25 -43 50 24 -44 8 10 -43 45 41 1.10 - 24 0 0 -43 38 59 0 45 51.5 23 275 -33 -43 45 30 -43 32 30 -43 50 15 -43 27 47 1.10 - 23 0 0 -43 21 8 0 45 55.0 22 275 -33 -43 27 38 -43 14 38 -43 32 22 -43 9 56 1.11 - 22 0 0 -43 3 20 0 45 58.4 22 274 -34 -43 9 50 -42 56 51 -43 14 34 -42 52 9 1.11 - 21 0 0 -42 45 37 0 46 1.7 21 273 -34 -42 52 6 -42 39 8 -42 56 50 -42 34 26 1.11 - 20 0 0 -42 27 58 0 46 4.9 20 272 -34 -42 34 27 -42 21 30 -42 39 10 -42 16 49 1.11 - 19 0 0 -42 10 25 0 46 8.1 20 271 -35 -42 16 53 -42 3 57 -42 21 36 -41 59 16 1.11 - 18 0 0 -41 52 57 0 46 11.1 19 271 -35 -41 59 25 -41 46 30 -42 4 8 -41 41 50 1.11 - 17 0 0 -41 35 36 0 46 14.0 18 270 -35 -41 42 4 -41 29 10 -41 46 46 -41 24 29 1.11 - 16 0 0 -41 18 22 0 46 16.8 17 269 -36 -41 24 49 -41 11 56 -41 29 31 -41 7 16 1.12 - 15 0 0 -41 1 15 0 46 19.5 17 268 -36 -41 7 41 -40 54 50 -41 12 23 -40 50 10 1.12 - 14 0 0 -40 44 16 0 46 22.0 16 268 -36 -40 50 42 -40 37 51 -40 55 23 -40 33 12 1.12 - 13 0 0 -40 27 25 0 46 24.5 15 267 -36 -40 33 50 -40 21 1 -40 38 31 -40 16 22 1.12 - 12 0 0 -40 10 43 0 46 26.9 14 266 -37 -40 17 7 -40 4 19 -40 21 47 -39 59 40 1.12 - 11 0 0 -39 54 9 0 46 29.1 13 265 -37 -40 0 33 -39 47 46 -40 5 13 -39 43 8 1.13 - 10 0 0 -39 37 46 0 46 31.2 13 265 -37 -39 44 9 -39 31 23 -39 48 48 -39 26 46 1.13 - 9 0 0 -39 21 32 0 46 33.2 12 264 -37 -39 27 55 -39 15 10 -39 32 34 -39 10 33 1.13 - 8 0 0 -39 5 29 0 46 35.0 11 263 -37 -39 11 51 -38 59 8 -39 16 30 -38 54 31 1.14 - 7 0 0 -38 49 37 0 46 36.8 10 263 -37 -38 55 58 -38 43 16 -39 0 36 -38 38 40 1.14 - 6 0 0 -38 33 56 0 46 38.4 9 262 -38 -38 40 17 -38 27 36 -38 44 54 -38 23 0 1.15 - 5 0 0 -38 18 27 0 46 39.8 9 261 -38 -38 24 47 -38 12 7 -38 29 24 -38 7 32 1.15 - 4 0 0 -38 3 10 0 46 41.2 8 261 -38 -38 9 29 -37 56 51 -38 14 6 -37 52 16 1.16 - 3 0 0 -37 48 5 0 46 42.4 7 260 -38 -37 54 24 -37 41 47 -37 59 0 -37 37 12 1.17 - 2 0 0 -37 33 13 0 46 43.4 6 260 -38 -37 39 32 -37 26 56 -37 44 8 -37 22 22 1.18 - 1 0 0 -37 18 35 0 46 44.4 5 259 -38 -37 24 53 -37 12 18 -37 29 28 -37 7 44 1.20 0 0 0 -37 4 10 0 46 45.2 4 258 -38 -37 10 27 -36 57 54 -37 15 2 -36 53 20 1.22 1 0 0 -36 49 59 0 46 45.9 4 258 -38 -36 56 16 -36 43 43 -37 0 50 -36 39 11 1.25 2 0 0 -36 36 3 0 46 46.4 3 257 -38 -36 42 19 -36 29 47 -36 46 53 -36 25 15 1.30 3 0 0 -36 22 21 0 46 46.8 2 257 -37 -36 28 36 -36 16 6 -36 33 10 -36 11 34 1.39 4 0 0 -36 8 54 0 46 47.0 1 256 -37 -36 15 9 -36 2 40 -36 19 42 -35 58 9 1.63 5 0 0 -35 55 43 0 46 47.2 0 255 -37 -36 1 57 -35 49 29 -36 6 29 -35 44 58 3.59 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 5778-01524-1 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 58 50.7594 DE: -12 06 20.599 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 58 50.7592 DE: -12 06 20.599 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.7 * B mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (10944) 1999 FJ26 asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.12930 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 date of fit: 2023 Apr 25 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): 0.013", 0.003", 70.341° remarks: * orbital elements for (10944)1999 FJ26 : Mean anomaly = 72.5161503592 deg Arg. of pericenter = 343.4402721069 deg Long. of node = 261.7789986613 deg Inclination = 4.2664862192 deg Eccentricity = 0.1685997274 Semimajor axis = 2.5439103289 AU Perihelion dist = 2.1150077408 AU Mag: H = 13.02, G = 0.15 Epoch of elements : MJD 60611.02900571 TDT (2024 Oct 28.0290) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr25,1.04,2024,10,28,0.696135,0.131378,-0.718102,8.015530,1.463341,0.005451,0.001525,0.000000,0.000000 -92.2516,-12.0096,165.50,-13.22,False TYC 5778-01524-1,20.98076652,-12.1057218,11.17,10.73,10.49,0.0,0,,21.00338507,-12.0095731,7.01,6.80,0,0,0 10944,1999 FJ26,17.74,15.071,2.1293,0,0,2.257,6.05,,0.8,0 0,72.2662,2024,10,27,343.4403,261.7790,4.2665,0.16860,2.54391,2.11501,13.02,5.0,0.15 1.363,0.0133,0.0029,70,0.0036,Known errors,0.97,0,-1,-1 20241028_1524-1,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org