IOTA/IOTA-ES occultation update for (2308) Schilt / UCAC4 301-132710 event on 2024 Mar 25, 06:34 UT Visible from Summary ------- On 2024 Mar 25 UT, the 17.625 km diameter asteroid (2308) Schilt will occult a 11.5 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.63 mag to 16.08 mag (the magnitude of the asteroid) for at most 1.110 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: 93 * date and approx. time of event: 2024 Mar 25, 06:27 - 2024 Mar 25, 06:41 * geocentric midpoint of event [JD]: 2460394.77378596 * magnitude of target star: 11.47 * magnitude drop [mag]: 4.63 * estimated maximum duration [s]: 1.110 * Moon: 100 % sunlit, 79° distance * Sun: 102° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.002", 104°) * approx speed of asteroid's shadow [km/s]: 15.8473 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 301-132710 by 2308 Schilt on 2024 Mar 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 - 90 0 0 28 18 18 6 27 33.4 0 124 -59 28 12 31 .. .. .. 28 7 8 .. .. .. .... - 89 0 0 27 41 26 6 27 33.4 1 125 -60 27 35 37 27 47 15 27 30 12 27 52 40 0.13 - 88 0 0 27 3 45 6 27 33.6 2 125 -60 26 57 54 27 9 36 26 52 28 27 15 3 0.05 - 87 0 0 26 25 16 6 27 34.0 3 126 -60 26 19 23 26 31 9 26 13 55 26 36 37 0.02 - 86 0 0 25 45 58 6 27 34.5 4 126 -61 25 40 3 25 51 53 25 34 33 25 57 23 0.01 - 85 0 0 25 5 52 6 27 35.2 6 127 -61 24 59 56 25 11 49 24 54 24 25 17 21 0.00 - 84 0 0 24 24 58 6 27 36.0 7 127 -61 24 19 0 24 30 57 24 13 26 24 36 30 0.00 - 83 0 0 23 43 16 6 27 37.0 8 128 -62 23 37 16 23 49 16 23 31 41 23 54 51 -0.01 - 82 0 0 23 0 47 6 27 38.2 9 128 -62 22 54 44 23 6 49 22 49 8 23 12 25 -0.01 - 81 0 0 22 17 30 6 27 39.6 10 128 -62 22 11 26 22 23 34 22 5 48 22 29 12 -0.01 - 80 0 0 21 33 27 6 27 41.1 11 129 -62 21 27 22 21 39 33 21 21 42 21 45 13 -0.01 - 79 0 0 20 48 38 6 27 42.9 13 129 -62 20 42 31 20 54 46 20 36 50 21 0 27 -0.01 - 78 0 0 20 3 5 6 27 44.8 14 129 -62 19 56 56 20 9 14 19 51 13 20 14 57 -0.02 - 77 0 0 19 16 47 6 27 46.9 15 130 -62 19 10 36 19 22 57 19 4 51 19 28 42 -0.02 - 76 0 0 18 29 46 6 27 49.2 16 130 -62 18 23 33 18 35 58 18 17 47 18 41 44 -0.02 - 75 0 0 17 42 2 6 27 51.8 17 130 -62 17 35 49 17 48 16 17 30 1 17 54 4 -0.02 - 74 0 0 16 53 38 6 27 54.5 19 131 -62 16 47 23 16 59 54 16 41 34 17 5 43 -0.02 - 73 0 0 16 4 35 6 27 57.4 20 131 -61 15 58 18 16 10 51 15 52 28 16 16 42 -0.02 - 72 0 0 15 14 53 6 28 0.6 21 131 -61 15 8 35 15 21 11 15 2 44 15 27 3 -0.02 - 71 0 0 14 24 35 6 28 3.9 23 132 -61 14 18 16 14 30 54 14 12 23 14 36 47 -0.02 - 70 0 0 13 33 42 6 28 7.5 24 132 -60 13 27 21 13 40 3 13 21 28 13 45 56 -0.02 - 69 0 0 12 42 16 6 28 11.3 25 132 -60 12 35 54 12 48 38 12 29 59 12 54 33 -0.02 - 68 0 0 11 50 19 6 28 15.3 26 132 -59 11 43 56 11 56 42 11 38 0 12 2 38 -0.02 - 67 0 0 10 57 53 6 28 19.6 28 132 -59 10 51 29 11 4 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40 -31 25 18 -0.03 69 0 0 -31 10 52 6 40 43.7 15 244 55 -31 16 10 -31 5 34 -31 21 6 -31 0 38 -0.03 70 0 0 -30 45 31 6 40 45.4 14 243 56 -30 50 51 -30 40 11 -30 55 48 -30 35 14 -0.03 71 0 0 -30 19 26 6 40 46.9 13 243 56 -30 24 47 -30 14 5 -30 29 46 -30 9 6 -0.03 72 0 0 -29 52 37 6 40 48.4 12 242 57 -29 58 0 -29 47 14 -30 3 0 -29 42 14 -0.02 73 0 0 -29 25 3 6 40 49.8 11 242 58 -29 30 27 -29 19 38 -29 35 29 -29 14 37 -0.02 74 0 0 -28 56 44 6 40 51.0 10 241 58 -29 2 10 -28 51 18 -29 7 13 -28 46 15 -0.02 75 0 0 -28 27 39 6 40 52.2 9 241 59 -28 33 7 -28 22 12 -28 38 12 -28 17 7 -0.02 76 0 0 -27 57 49 6 40 53.2 8 240 60 -28 3 19 -27 52 20 -28 8 25 -27 47 14 -0.02 77 0 0 -27 27 14 6 40 54.1 7 240 60 -27 32 45 -27 21 43 -27 37 52 -27 16 35 -0.01 78 0 0 -26 55 52 6 40 54.9 6 239 61 -27 1 25 -26 50 19 -27 6 34 -26 45 10 -0.01 79 0 0 -26 23 45 6 40 55.6 5 239 62 -26 29 19 -26 18 10 -26 34 30 -26 12 59 0.00 80 0 0 -25 50 51 6 40 56.1 4 238 62 -25 56 27 -25 45 15 -26 1 39 -25 40 2 0.01 81 0 0 -25 17 11 6 40 56.5 3 238 63 -25 22 48 -25 11 33 -25 28 3 -25 6 19 0.02 82 0 0 -24 42 45 6 40 56.8 1 238 63 -24 48 24 -24 37 5 -24 53 40 -24 31 49 0.06 83 0 0 -24 7 32 6 40 56.9 0 237 64 -24 13 13 -24 1 51 -24 18 31 -23 56 34 0.35 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 301-132710 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 26 52.3609 DE: -29 53 40.314 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 26 52.3610 DE: -29 53 40.314 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2308) Schilt asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.014 distance from Earth [AU]: 1.71720 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 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): 0.022", 0.002", 103.9° remarks: * orbital elements for (2308)Schilt : Mean anomaly = 338.0205219967 deg Arg. of pericenter = 233.2959641032 deg Long. of node = 34.2039455674 deg Inclination = 14.1746511242 deg Eccentricity = 0.1719761769 Semimajor axis = 2.5492935556 AU Perihelion dist = 2.1108757960 AU Mag: H = 12.03, G = 0.15 Epoch of elements : MJD 60394.27378583 TDT (2024 Mar 25.2738) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,1.11,2024,3,25,6.570863,0.023318,0.039693,7.717582,-4.521660,-0.005294,0.000423,0.000000,0.000000 -19.6736,-29.9154,82.91,2.03,False UCAC4 301-132710,17.44787799,-29.8945317,11.61,11.47,11.39,0.0,0,,17.47366371,-29.9154368,4.63,4.26,0,0,0 2308,Schilt,16.08,17.625,1.7172,0,0,3.040,-23.16,,1.2,0 0,337.9542,2024,3,25,233.2960,34.2039,14.1747,0.17198,2.54929,2.11088,12.03,5.0,0.15 1.465,0.0220,0.0022,104,0.0066,Known errors,0.82,0,-1,-1 20240325_132710,60139.25 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org