IOTA/IOTA-ES occultation update for (21088) Chelyabinsk / TYC 1660-01428-1 event on 2024 Jul 28, 00:11 UT Visible from Summary ------- On 2024 Jul 28 UT, the 4.51851825230545 km diameter asteroid (21088) Chelyabinsk will occult a 9.5 mag star in the constellation Vulpecula for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.47 mag to 13.96 mag (the magnitude of the asteroid) for at most 0.250 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: 20 * date and approx. time of event: 2024 Jul 28, 00:06 - 2024 Jul 28, 00:17 * geocentric midpoint of event [JD]: 2460519.50827995 * magnitude of target star: 9.51 * magnitude drop [mag]: 4.47 * estimated maximum duration [s]: 0.250 * Moon: 50 % sunlit, 72° distance * Sun: 140° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 5 * 1 sigma uncertainty interval [path widths]: +/- 3.37 * 1 sigma uncertainty interval [seconds]: +/- 0.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.042, +/- 0.048) * 1 sigma uncertainty ellipse (major, minor, PA): (0.063", 0.007", 41°) * approx speed of asteroid's shadow [km/s]: 18.9020 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1660-01428-1 by 21088 Chelyabinsk on 2024 Jul 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 -132 0 0 63 19 22 0 17 18.5 0 39 34 63 21 26 63 17 19 63 35 15 63 3 32 .... -131 0 0 63 51 40 0 17 18.5 1 40 33 63 53 41 63 49 39 64 7 19 63 36 3 -0.33 -130 0 0 64 22 35 0 17 18.4 2 41 33 64 24 35 64 20 35 64 38 0 64 7 12 -0.31 -129 0 0 64 52 11 0 17 18.2 2 42 32 64 54 9 64 50 13 65 7 23 64 37 1 -0.30 -128 0 0 65 20 31 0 17 18.0 3 43 31 65 22 28 65 18 35 65 35 30 65 5 34 -0.30 -127 0 0 65 47 40 0 17 17.8 4 44 31 65 49 35 65 45 45 66 2 26 65 32 55 -0.30 -126 0 0 66 13 40 0 17 17.5 4 45 30 66 15 33 66 11 47 66 28 14 65 59 7 -0.30 -125 0 0 66 38 34 0 17 17.3 5 46 30 66 40 26 66 36 43 66 52 57 66 24 13 -0.30 -124 0 0 67 2 26 0 17 16.9 5 47 29 67 4 16 67 0 36 67 16 37 66 48 16 -0.30 -123 0 0 67 25 18 0 17 16.6 6 48 29 67 27 7 67 23 29 67 39 18 67 11 19 -0.29 -122 0 0 67 47 13 0 17 16.2 6 49 28 67 49 0 67 45 25 68 1 2 67 33 25 -0.29 -121 0 0 68 8 13 0 17 15.9 7 50 28 68 9 59 68 6 27 68 21 52 67 54 35 -0.29 -120 0 0 68 28 21 0 17 15.5 7 50 27 68 30 6 68 26 36 68 41 50 68 14 54 -0.29 -119 0 0 68 47 39 0 17 15.1 8 51 27 68 49 23 68 45 56 69 0 58 68 34 22 -0.29 -118 0 0 69 6 10 0 17 14.7 8 52 27 69 7 52 69 4 28 69 19 19 68 53 1 -0.29 -117 0 0 69 23 55 0 17 14.2 9 53 26 69 25 36 69 22 14 69 36 55 69 10 55 -0.29 -116 0 0 69 40 55 0 17 13.8 9 54 26 69 42 35 69 39 16 69 53 47 69 28 5 -0.29 -115 0 0 69 57 14 0 17 13.3 10 55 25 69 58 53 69 55 36 70 9 57 69 44 32 -0.29 -114 0 0 70 12 53 0 17 12.9 10 56 25 70 14 31 70 11 15 70 25 28 70 0 19 -0.29 -113 0 0 70 27 53 0 17 12.4 11 57 24 70 29 30 70 26 16 70 40 20 70 15 27 -0.29 -112 0 0 70 42 16 0 17 11.9 11 58 24 70 43 52 70 40 40 70 54 35 70 29 58 -0.29 -111 0 0 70 56 3 0 17 11.4 11 59 24 70 57 38 70 54 29 71 8 15 70 43 53 -0.29 -110 0 0 71 9 16 0 17 10.9 12 60 23 71 10 50 71 7 43 71 21 21 70 57 13 -0.29 -109 0 0 71 21 56 0 17 10.5 12 61 23 71 23 29 71 20 24 71 33 54 71 10 0 -0.29 -108 0 0 71 34 5 0 17 10.0 13 62 23 71 35 37 71 32 33 71 45 56 71 22 15 -0.29 -107 0 0 71 45 43 0 17 9.4 13 63 22 71 47 14 71 44 11 71 57 27 71 33 59 -0.29 -106 0 0 71 56 51 0 17 8.9 13 64 22 71 58 21 71 55 20 72 8 29 71 45 13 -0.29 -105 0 0 72 7 31 0 17 8.4 14 65 22 72 9 0 72 6 1 72 19 3 71 55 59 -0.29 -104 0 0 72 17 43 0 17 7.9 14 66 21 72 19 12 72 16 14 72 29 10 72 6 17 -0.29 -103 0 0 72 27 29 0 17 7.4 14 66 21 72 28 57 72 26 1 72 38 50 72 16 8 -0.29 -102 0 0 72 36 49 0 17 6.9 15 67 21 72 38 17 72 35 21 72 48 5 72 25 33 -0.29 -101 0 0 72 45 44 0 17 6.3 15 68 20 72 47 11 72 44 17 72 56 56 72 34 34 -0.29 -100 0 0 72 54 16 0 17 5.8 15 69 20 72 55 42 72 52 49 73 5 22 72 43 10 -0.29 - 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0 7 59 0 8 49.5 52 305 -46 - 0 5 38 - 0 10 19 0 10 6 - 0 26 1 -0.28 41 0 0 - 1 36 37 0 8 41.1 50 306 -46 - 1 34 18 - 1 38 55 - 1 18 46 - 1 54 25 -0.28 42 0 0 - 3 3 31 0 8 33.0 49 307 -46 - 3 1 14 - 3 5 48 - 2 45 54 - 3 21 5 -0.28 43 0 0 - 4 28 38 0 8 25.3 47 307 -45 - 4 26 23 - 4 30 53 - 4 11 16 - 4 45 59 -0.28 44 0 0 - 5 51 56 0 8 17.8 45 308 -45 - 5 49 43 - 5 54 9 - 5 34 47 - 6 9 2 -0.28 45 0 0 - 7 13 21 0 8 10.7 44 308 -44 - 7 11 9 - 7 15 32 - 6 56 25 - 7 30 13 -0.28 46 0 0 - 8 32 51 0 8 3.9 42 308 -44 - 8 30 41 - 8 35 1 - 8 16 10 - 8 49 30 -0.28 47 0 0 - 9 50 26 0 7 57.4 41 308 -43 - 9 48 18 - 9 52 34 - 9 33 58 -10 6 52 -0.28 48 0 0 -11 6 4 0 7 51.2 39 309 -43 -11 3 58 -11 8 10 -10 49 49 -11 22 17 -0.28 49 0 0 -12 19 45 0 7 45.3 38 309 -42 -12 17 41 -12 21 50 -12 3 44 -12 35 45 -0.28 50 0 0 -13 31 29 0 7 39.7 36 309 -42 -13 29 27 -13 33 32 -13 15 41 -13 47 16 -0.28 51 0 0 -14 41 17 0 7 34.4 35 309 -41 -14 39 15 -14 43 18 -14 25 41 -14 56 51 -0.28 52 0 0 -15 49 8 0 7 29.4 33 309 -40 -15 47 8 -15 51 7 -15 33 44 -16 4 29 -0.28 53 0 0 -16 55 3 0 7 24.6 32 309 -39 -16 53 5 -16 57 1 -16 39 52 -17 10 13 -0.28 54 0 0 -17 59 5 0 7 20.1 30 308 -39 -17 57 8 -18 1 1 -17 44 5 -18 14 3 -0.28 55 0 0 -19 1 13 0 7 15.9 29 308 -38 -18 59 19 -19 3 8 -18 46 26 -19 16 0 -0.29 56 0 0 -20 1 31 0 7 12.0 28 308 -37 -19 59 37 -20 3 24 -19 46 55 -20 16 6 -0.29 57 0 0 -20 59 59 0 7 8.2 26 308 -36 -20 58 7 -21 1 50 -20 45 33 -21 14 22 -0.29 58 0 0 -21 56 39 0 7 4.7 25 308 -36 -21 54 48 -21 58 29 -21 42 24 -22 10 51 -0.29 59 0 0 -22 51 33 0 7 1.5 24 307 -35 -22 49 43 -22 53 22 -22 37 29 -23 5 35 -0.29 60 0 0 -23 44 43 0 6 58.4 23 307 -34 -23 42 55 -23 46 31 -23 30 50 -23 58 35 -0.29 61 0 0 -24 36 11 0 6 55.6 21 307 -33 -24 34 25 -24 37 58 -24 22 28 -24 49 53 -0.29 62 0 0 -25 26 0 0 6 53.0 20 306 -33 -25 24 15 -25 27 46 -25 12 27 -25 39 32 -0.29 63 0 0 -26 14 12 0 6 50.5 19 306 -32 -26 12 28 -26 15 56 -26 0 48 -26 27 34 -0.29 64 0 0 -27 0 48 0 6 48.3 18 305 -31 -26 59 5 -27 2 31 -26 47 33 -27 14 1 -0.29 65 0 0 -27 45 51 0 6 46.2 17 305 -30 -27 44 9 -27 47 32 -27 32 45 -27 58 55 -0.29 66 0 0 -28 29 23 0 6 44.3 15 305 -29 -28 27 42 -28 31 3 -28 16 26 -28 42 19 -0.29 67 0 0 -29 11 26 0 6 42.5 14 304 -29 -29 9 47 -29 13 6 -28 58 38 -29 24 14 -0.30 68 0 0 -29 52 3 0 6 40.9 13 304 -28 -29 50 24 -29 53 41 -29 39 22 -30 4 42 -0.30 69 0 0 -30 31 15 0 6 39.5 12 303 -27 -30 29 38 -30 32 52 -30 18 43 -30 43 47 -0.30 70 0 0 -31 9 5 0 6 38.2 11 303 -26 -31 7 28 -31 10 41 -30 56 40 -31 21 29 -0.30 71 0 0 -31 45 34 0 6 37.0 10 302 -26 -31 43 59 -31 47 10 -31 33 17 -31 57 51 -0.30 72 0 0 -32 20 45 0 6 36.0 9 302 -25 -32 19 11 -32 22 20 -32 8 35 -32 32 55 -0.31 73 0 0 -32 54 40 0 6 35.1 8 301 -24 -32 53 6 -32 56 13 -32 42 36 -33 6 42 -0.31 74 0 0 -33 27 20 0 6 34.3 7 301 -23 -33 25 47 -33 28 53 -33 15 23 -33 39 16 -0.32 75 0 0 -33 58 47 0 6 33.6 6 300 -23 -33 57 15 -34 0 19 -33 46 57 -34 10 37 -0.32 76 0 0 -34 29 4 0 6 33.0 5 299 -22 -34 27 32 -34 30 35 -34 17 19 -34 40 47 -0.33 77 0 0 -34 58 11 0 6 32.6 4 299 -21 -34 56 40 -34 59 41 -34 46 33 -35 9 48 -0.34 78 0 0 -35 26 10 0 6 32.2 3 298 -20 -35 24 41 -35 27 40 -35 14 38 -35 37 42 -0.36 79 0 0 -35 53 4 0 6 32.0 2 298 -20 -35 51 35 -35 54 33 -35 41 38 -36 4 30 -0.39 80 0 0 -36 18 54 0 6 31.8 1 297 -19 -36 17 26 -36 20 22 -36 7 32 -36 30 14 -0.45 81 0 0 -36 43 40 0 6 31.7 0 297 -18 -36 42 13 -36 45 8 -36 32 24 -36 54 56 -0.78 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 1660-01428-1 * constellation : Vulpecula * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 01 51.3716 DE: +20 40 06.943 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 01 51.3717 DE: +20 40 06.944 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.5 * B mag [mag]: 11.1 * Diameter [mas]: 0.50 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (21088) Chelyabinsk asteroid class: approx. diameter [km]: 5 approx. diameter ["]: 0.018 distance from Earth [AU]: 0.35430 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#652 date of fit: 2023 May 20 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): 0.063", 0.007", 41.031° remarks: * orbital elements for (21088)Chelyabinsk : Mean anomaly = 352.5923972818 deg Arg. of pericenter = 27.1566693875 deg Long. of node = 297.8303819081 deg Inclination = 38.4543919747 deg Eccentricity = 0.2384339431 Semimajor axis = 1.7065221900 AU Perihelion dist = 1.2996293753 AU Mag: H = 14.33, G = 0.15 Epoch of elements : MJD 60519.00827984 TDT (2024 Jul 28.0083) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#6522023May20,0.25,2024,7,28,0.198719,0.230576,0.155797,-5.972388,8.840492,-0.000438,-0.001971,0.000001,0.000000 6.6059,20.7653,178.65,18.91,False TYC 1660-01428-1,21.03093656,20.6685951,11.08,9.51,8.66,0.5,4,,21.04981790,20.7652699,4.47,4.86,0,0,0 21088,Chelyabinsk,13.96,4.647,0.3543,0,0,-10.572,219.34,,0.2,0 0,352.1466,2024,7,27,27.1567,297.8304,38.4544,0.23843,1.70652,1.29963,14.33,5.0,0.15 4.361,0.0630,0.0070,41,0.0609,Known errors,0.91,0,-1,-1 20240728_1428-1,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org