IOTA/IOTA-ES occultation update for (2681) Ostrovskij / TYC 6896-01119-1 event on 2024 Jul 20, 21:16 UT Visible from Summary ------- On 2024 Jul 20 UT, the 13.369 km diameter asteroid (2681) Ostrovskij will occult a 10.8 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.21 mag to 16.98 mag (the magnitude of the asteroid) for at most 0.920 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 Jul 20, 21:09 - 2024 Jul 20, 21:24 * geocentric midpoint of event [JD]: 2460512.38656846 * magnitude of target star: 10.77 * magnitude drop [mag]: 6.21 * estimated maximum duration [s]: 0.920 * Moon: 99 % sunlit, 6° distance * Sun: 175° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 81°) * approx speed of asteroid's shadow [km/s]: 14.4757 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6896-01119-1 by 2681 Ostrovskij on 2024 Jul 20 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 - 58 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -17 25 42 .. .. .. -17 27 40 .... - 57 0 0 -17 49 59 21 23 58.2 1 116 1 -17 45 56 -17 54 2 -17 43 58 -17 55 59 .... - 56 0 0 -18 17 58 21 23 57.9 2 116 0 -18 13 56 -18 22 0 -18 11 58 -18 23 58 0.13 - 55 0 0 -18 45 36 21 23 57.6 3 115 -1 -18 41 34 -18 49 38 -18 39 36 -18 51 35 0.11 - 54 0 0 -19 12 51 21 23 57.0 4 115 -2 -19 8 50 -19 16 53 -19 6 53 -19 18 50 0.10 - 53 0 0 -19 39 44 21 23 56.4 5 115 -3 -19 35 43 -19 43 45 -19 33 46 -19 45 42 0.10 - 52 0 0 -20 6 14 21 23 55.5 6 114 -5 -20 2 14 -20 10 15 -20 0 17 -20 12 11 0.09 - 51 0 0 -20 32 21 21 23 54.6 7 114 -6 -20 28 21 -20 36 21 -20 26 25 -20 38 18 0.09 - 50 0 0 -20 58 5 21 23 53.5 8 114 -7 -20 54 5 -21 2 4 -20 52 9 -21 4 0 0.09 - 49 0 0 -21 23 24 21 23 52.3 9 113 -8 -21 19 25 -21 27 23 -21 17 30 -21 29 19 0.09 - 48 0 0 -21 48 20 21 23 50.9 10 113 -9 -21 44 21 -21 52 18 -21 42 26 -21 54 14 0.09 - 47 0 0 -22 12 51 21 23 49.5 11 113 -10 -22 8 53 -22 16 48 -22 6 58 -22 18 44 0.09 - 46 0 0 -22 36 57 21 23 47.9 12 112 -11 -22 33 0 -22 40 54 -22 31 5 -22 42 49 0.09 - 45 0 0 -23 0 38 21 23 46.1 13 112 -12 -22 56 42 -23 4 35 -22 54 47 -23 6 30 0.09 - 44 0 0 -23 23 55 21 23 44.3 14 111 -13 -23 19 59 -23 27 51 -23 18 4 -23 29 46 0.08 - 43 0 0 -23 46 46 21 23 42.3 15 111 -14 -23 42 50 -23 50 42 -23 40 56 -23 52 36 0.08 - 42 0 0 -24 9 12 21 23 40.3 16 111 -15 -24 5 17 -24 13 7 -24 3 23 -24 15 1 0.08 - 41 0 0 -24 31 12 21 23 38.1 17 110 -15 -24 27 17 -24 35 6 -24 25 24 -24 37 0 0.08 - 40 0 0 -24 52 46 21 23 35.8 18 110 -16 -24 48 52 -24 56 40 -24 46 59 -24 58 34 0.08 - 39 0 0 -25 13 55 21 23 33.4 19 109 -17 -25 10 2 -25 17 49 -25 8 8 -25 19 42 0.08 - 38 0 0 -25 34 38 21 23 30.9 20 109 -18 -25 30 45 -25 38 31 -25 28 52 -25 40 24 0.08 - 37 0 0 -25 54 55 21 23 28.3 21 108 -19 -25 51 2 -25 58 47 -25 49 10 -26 0 40 0.08 - 36 0 0 -26 14 46 21 23 25.6 22 108 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33 102 -31 -29 35 12 -29 42 44 -29 33 23 -29 44 34 0.08 - 23 0 0 -29 53 10 21 22 42.5 34 102 -32 -29 49 24 -29 56 55 -29 47 35 -29 58 45 0.08 - 22 0 0 -30 6 56 21 22 38.6 35 101 -33 -30 3 11 -30 10 41 -30 1 21 -30 12 30 0.09 - 21 0 0 -30 20 16 21 22 34.7 36 101 -34 -30 16 31 -30 24 0 -30 14 42 -30 25 49 0.09 - 20 0 0 -30 33 10 21 22 30.7 37 100 -35 -30 29 26 -30 36 54 -30 27 37 -30 38 43 0.09 - 19 0 0 -30 45 39 21 22 26.6 37 100 -35 -30 41 55 -30 49 23 -30 40 6 -30 51 11 0.09 - 18 0 0 -30 57 42 21 22 22.5 38 99 -36 -30 53 58 -31 1 25 -30 52 10 -31 3 14 0.09 - 17 0 0 -31 9 19 21 22 18.3 39 98 -37 -31 5 36 -31 13 2 -31 3 48 -31 14 51 0.09 - 16 0 0 -31 20 31 21 22 14.1 40 98 -38 -31 16 48 -31 24 14 -31 15 0 -31 26 2 0.09 - 15 0 0 -31 31 18 21 22 9.8 41 97 -39 -31 27 35 -31 35 0 -31 25 48 -31 36 48 0.09 - 14 0 0 -31 41 39 21 22 5.4 42 97 -40 -31 37 57 -31 45 21 -31 36 9 -31 47 9 0.09 - 13 0 0 -31 51 35 21 22 1.0 43 96 -41 -31 47 54 -31 55 17 -31 46 6 -31 57 5 0.09 - 12 0 0 -32 1 6 21 21 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21 10 44.6 36 245 -37 - 8 37 32 - 8 45 46 - 8 35 32 - 8 47 46 0.08 99 0 0 - 8 9 53 21 10 39.7 35 245 -36 - 8 5 46 - 8 14 1 - 8 3 46 - 8 16 1 0.08 100 0 0 - 7 38 1 21 10 34.9 34 245 -34 - 7 33 53 - 7 42 8 - 7 31 53 - 7 44 8 0.08 101 0 0 - 7 6 2 21 10 30.2 33 245 -33 - 7 1 55 - 7 10 10 - 6 59 55 - 7 12 10 0.08 102 0 0 - 6 33 59 21 10 25.7 31 245 -32 - 6 29 51 - 6 38 6 - 6 27 51 - 6 40 6 0.08 103 0 0 - 6 1 51 21 10 21.3 30 244 -31 - 5 57 44 - 6 5 59 - 5 55 44 - 6 7 59 0.08 104 0 0 - 5 29 40 21 10 17.0 29 244 -30 - 5 25 33 - 5 33 48 - 5 23 33 - 5 35 48 0.08 105 0 0 - 4 57 27 21 10 12.9 28 244 -29 - 4 53 19 - 5 1 34 - 4 51 19 - 5 3 35 0.08 106 0 0 - 4 25 12 21 10 8.9 27 244 -28 - 4 21 5 - 4 29 20 - 4 19 4 - 4 31 20 0.08 107 0 0 - 3 52 57 21 10 5.1 26 244 -27 - 3 48 49 - 3 57 4 - 3 46 49 - 3 59 4 0.08 108 0 0 - 3 20 42 21 10 1.4 25 244 -26 - 3 16 34 - 3 24 49 - 3 14 34 - 3 26 49 0.08 109 0 0 - 2 48 28 21 9 57.8 24 244 -24 - 2 44 20 - 2 52 35 - 2 42 20 - 2 54 35 0.08 110 0 0 - 2 16 16 21 9 54.4 23 244 -23 - 2 12 8 - 2 20 23 - 2 10 9 - 2 22 23 0.08 111 0 0 - 1 44 7 21 9 51.2 21 244 -22 - 1 40 0 - 1 48 14 - 1 38 0 - 1 50 14 0.08 112 0 0 - 1 12 2 21 9 48.1 20 244 -21 - 1 7 55 - 1 16 9 - 1 5 55 - 1 18 9 0.09 113 0 0 - 0 40 2 21 9 45.2 19 244 -20 - 0 35 55 - 0 44 9 - 0 33 55 - 0 46 8 0.09 114 0 0 - 0 8 7 21 9 42.4 18 244 -19 - 0 4 0 - 0 12 14 - 0 2 1 - 0 14 14 0.09 115 0 0 0 23 41 21 9 39.8 17 244 -18 0 27 47 0 19 34 0 29 47 0 17 35 0.09 116 0 0 0 55 21 21 9 37.4 16 244 -17 0 59 28 0 51 15 1 1 27 0 49 16 0.09 117 0 0 1 26 54 21 9 35.1 15 244 -16 1 31 0 1 22 48 1 32 59 1 20 48 0.09 118 0 0 1 58 17 21 9 33.0 14 244 -14 2 2 23 1 54 11 2 4 22 1 52 12 0.09 119 0 0 2 29 30 21 9 31.1 12 244 -13 2 33 36 2 25 24 2 35 35 2 23 25 0.09 120 0 0 3 0 32 21 9 29.3 11 244 -12 3 4 38 2 56 27 3 6 37 2 54 28 0.09 121 0 0 3 31 23 21 9 27.7 10 244 -11 3 35 28 3 27 18 3 37 27 3 25 19 0.09 122 0 0 4 2 1 21 9 26.2 9 244 -10 4 6 6 3 57 57 4 8 4 3 55 58 0.10 123 0 0 4 32 26 21 9 25.0 8 244 -9 4 36 30 4 28 22 4 38 29 4 26 23 0.10 124 0 0 5 2 37 21 9 23.9 7 244 -8 5 6 41 4 58 33 5 8 39 4 56 35 0.10 125 0 0 5 32 33 21 9 22.9 6 244 -7 5 36 37 5 28 29 5 38 35 5 26 31 0.11 126 0 0 6 2 14 21 9 22.2 5 244 -6 6 6 17 5 58 10 6 8 15 5 56 12 0.12 127 0 0 6 31 38 21 9 21.5 4 244 -5 6 35 41 6 27 35 6 37 38 6 25 37 0.13 128 0 0 7 0 45 21 9 21.1 2 244 -3 7 4 47 6 56 43 7 6 45 6 54 45 0.15 129 0 0 7 29 35 21 9 20.8 1 245 -2 7 33 37 7 25 33 7 35 34 7 23 36 0.22 130 0 0 7 58 6 21 9 20.7 0 245 -1 8 2 8 7 54 5 8 4 5 7 52 8 0.80 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 6896-01119-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 00 27.0319 DE: -25 07 28.619 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 00 27.0319 DE: -25 07 28.619 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.8 * B mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2681) Ostrovskij asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.24950 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 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): 0.013", 0.002", 81.439° remarks: * orbital elements for (2681)Ostrovskij : Mean anomaly = 164.3059460371 deg Arg. of pericenter = 61.6714618631 deg Long. of node = 66.7022367282 deg Inclination = 3.9759698125 deg Eccentricity = 0.1940635897 Semimajor axis = 2.7446339977 AU Perihelion dist = 2.2120004718 AU Mag: H = 12.46, G = 0.15 Epoch of elements : MJD 60511.88656867 TDT (2024 Jul 20.8866) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr24,0.92,2024,7,20,21.277643,0.021601,-0.086611,-7.928203,-1.974949,0.000029,0.000457,0.000001,0.000000 42.1828,-25.0567,-137.55,20.43,False TYC 6896-01119-1,20.00750887,-25.1246163,11.17,10.77,10.55,0.0,0,,20.03256867,-25.0566950,6.22,5.98,0,0,0 2681,Ostrovskij,16.98,13.369,2.2495,0,0,-2.280,-7.72,,1.4,0 0,164.1138,2024,7,20,61.6715,66.7022,3.9760,0.19406,2.74463,2.21200,12.46,5.0,0.15 1.242,0.0127,0.0016,81,0.0020,Known errors,1.03,0,-1,-1 20240720_1119-1,60140.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org