IOTA/IOTA-ES occultation update for (88) Thisbe / UCAC4 566-028782 event on 2024 Dec 25, 02:11 UT Visible from Summary ------- On 2024 Dec 25 UT, the 208.340148274691 km diameter asteroid (88) Thisbe will occult a 10.5 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.41 mag to 11.58 mag (the magnitude of the asteroid) for at most 14.260 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 Dec 25, 02:04 - 2024 Dec 25, 02:17 * geocentric midpoint of event [JD]: 2460669.59100321 * magnitude of target star: 10.51 * magnitude drop [mag]: 1.41 * estimated maximum duration [s]: 14.260 * Moon: 30 % sunlit, 110° distance * Sun: 176° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 262 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 96°) * approx speed of asteroid's shadow [km/s]: 14.6212 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 566-028782 by 88 Thisbe on 2024 Dec 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 -135 0 0 .. .. .... .. .. .. .. .. .. 33 19 22 .. .. .. 33 21 50 .. .. .. .... -134 0 0 32 25 55 2 16 49.9 1 63 -5 33 46 19 31 7 5 33 48 46 31 4 43 .... -133 0 0 32 52 47 2 16 49.6 2 63 -6 34 13 19 31 33 50 34 15 47 31 31 28 -0.65 -132 0 0 33 19 43 2 16 49.3 3 64 -6 34 40 22 32 0 38 34 42 50 31 58 16 -0.68 -131 0 0 33 46 41 2 16 48.8 4 64 -7 35 7 27 32 27 30 35 9 55 32 25 7 -0.70 -130 0 0 34 13 40 2 16 48.1 5 65 -8 35 34 33 32 54 23 35 37 1 32 52 0 -0.71 -129 0 0 34 40 41 2 16 47.3 5 66 -9 36 1 39 33 21 17 36 4 8 33 18 55 -0.72 -128 0 0 35 7 41 2 16 46.4 6 66 -10 36 28 45 33 48 12 36 31 14 33 45 49 -0.72 -127 0 0 35 34 40 2 16 45.3 7 67 -11 36 55 51 34 15 6 36 58 20 34 12 43 -0.72 -126 0 0 36 1 38 2 16 44.1 8 67 -12 37 22 54 34 42 0 37 25 23 34 39 36 -0.73 -125 0 0 36 28 34 2 16 42.8 9 68 -13 37 49 54 35 8 51 37 52 23 35 6 27 -0.73 -124 0 0 36 55 26 2 16 41.3 10 69 -14 38 16 51 35 35 39 38 19 20 35 33 15 -0.73 -123 0 0 37 22 14 2 16 39.7 11 69 -15 38 43 43 36 2 24 38 46 13 36 0 0 -0.73 -122 0 0 37 48 58 2 16 38.0 12 70 -16 39 10 30 36 29 4 39 13 0 36 26 40 -0.73 -121 0 0 38 15 37 2 16 36.1 13 70 -16 39 37 12 36 55 40 39 39 42 36 53 16 -0.73 -120 0 0 38 42 9 2 16 34.2 14 71 -17 40 3 47 37 22 10 40 6 17 37 19 46 -0.73 -119 0 0 39 8 35 2 16 32.1 14 72 -18 40 30 15 37 48 33 40 32 45 37 46 9 -0.74 -118 0 0 39 34 53 2 16 29.9 15 72 -19 40 56 35 38 14 50 40 59 5 38 12 26 -0.74 -117 0 0 40 1 3 2 16 27.6 16 73 -20 41 22 46 38 40 58 41 25 17 38 38 34 -0.74 -116 0 0 40 27 4 2 16 25.2 17 74 -21 41 48 49 39 6 59 41 51 19 39 4 35 -0.74 -115 0 0 40 52 56 2 16 22.7 18 75 -22 42 14 41 39 32 50 42 17 11 39 30 26 -0.74 -114 0 0 41 18 38 2 16 20.1 19 75 -22 42 40 23 39 58 32 42 42 53 39 56 8 -0.74 -113 0 0 41 44 9 2 16 17.4 20 76 -23 43 5 53 40 24 4 43 8 24 40 21 39 -0.74 -112 0 0 42 9 29 2 16 14.6 20 77 -24 43 31 12 40 49 24 43 33 43 40 47 0 -0.74 -111 0 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5 26.0 11 291 -8 42 37 31 39 55 33 42 40 1 39 53 9 -0.79 70 0 0 40 49 52 2 5 24.4 10 292 -7 42 11 41 39 29 43 42 14 11 39 27 19 -0.80 71 0 0 40 23 52 2 5 23.0 9 292 -6 41 45 40 39 3 43 41 48 11 39 1 19 -0.80 72 0 0 39 57 43 2 5 21.7 8 293 -5 41 19 30 38 37 34 41 22 0 38 35 10 -0.81 73 0 0 39 31 24 2 5 20.5 8 294 -4 40 53 10 38 11 17 40 55 41 38 8 53 -0.81 74 0 0 39 4 58 2 5 19.4 7 294 -3 40 26 42 37 44 52 40 29 12 37 42 28 -0.82 75 0 0 38 38 24 2 5 18.5 6 295 -3 40 0 5 37 18 20 40 2 36 37 15 56 -0.84 76 0 0 38 11 43 2 5 17.7 5 296 -2 39 33 22 36 51 42 39 35 52 36 49 18 -0.85 77 0 0 37 44 56 2 5 17.0 4 296 -1 39 6 32 36 24 57 39 9 2 36 22 33 -0.88 78 0 0 37 18 3 2 5 16.4 3 297 0 38 39 36 35 58 8 38 42 6 35 55 44 -0.92 79 0 0 36 51 6 2 5 16.0 2 297 1 38 12 35 35 31 15 38 15 5 35 28 51 -0.99 80 0 0 36 24 5 2 5 15.7 1 298 2 37 45 30 35 4 18 37 48 0 35 1 54 -1.17 81 0 0 35 57 1 2 5 15.6 0 299 3 37 18 21 .. .. .. 37 20 51 .. .. .. -2.24 82 0 0 .. .. .... .. .. .. .. .. .. 36 51 10 .. .. .. 36 53 39 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: UCAC4 566-028782 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 34 18.4498 DE: +23 11 09.769 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 34 18.4498 DE: +23 11 09.769 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.5 * B mag [mag]: 11.1 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (88) Thisbe asteroid class: approx. diameter [km]: 208 approx. diameter ["]: 0.135 distance from Earth [AU]: 2.12130 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#171 date of fit: 2023 Feb 07 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): 0.009", 0.002", 95.977° remarks: * orbital elements for (88)Thisbe : Mean anomaly = 130.6810232562 deg Arg. of pericenter = 37.0149051574 deg Long. of node = 276.3221354630 deg Inclination = 5.2245546775 deg Eccentricity = 0.1637837039 Semimajor axis = 2.7705329807 AU Perihelion dist = 2.3167648274 AU Mag: H = 7.30, G = 0.14 Epoch of elements : MJD 60669.09100401 TDT (2024 Dec 25.0910) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1712023Feb07,14.26,2024,12,25,2.184077,-0.021993,0.603321,-8.247159,-0.300510,-0.000496,0.000034,0.000002,0.000000 -27.8887,23.1669,147.26,-23.38,False UCAC4 566-028782,6.57179160,23.1860468,11.06,10.51,10.21,0.1,0,,6.59746925,23.1668635,1.42,1.31,0,0,0 88,Thisbe,11.58,208.494,2.1213,0,0,-2.479,-1.25,,11.6,0 0,130.6616,2024,12,25,37.0149,276.3221,5.2246,0.16378,2.77053,2.31676,7.30,5.0,0.15 1.015,0.0087,0.0017,96,0.0021,Known errors,1.24,0,-1,-1 20241225_028782,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org