IOTA/IOTA-ES occultation update for (1643) Brown / TYC 4934-01218-1 event on 2024 Feb 24, 03:56 UT Visible from Summary ------- On 2024 Feb 24 UT, the 9.656 km diameter asteroid (1643) Brown will occult a 11.5 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.38 mag to 16.88 mag (the magnitude of the asteroid) for at most 0.810 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: 91 * date and approx. time of event: 2024 Feb 24, 03:48 - 2024 Feb 24, 04:04 * geocentric midpoint of event [JD]: 2460364.66423841 * magnitude of target star: 11.51 * magnitude drop [mag]: 5.38 * estimated maximum duration [s]: 0.810 * Moon: 100 % sunlit, 30° distance * Sun: 155° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.003", 113°) * approx speed of asteroid's shadow [km/s]: 11.8915 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4934-01218-1 by 1643 Brown on 2024 Feb 24 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 -127 0 0 -16 22 56 4 3 55.6 1 94 -17 -16 19 46 -16 26 5 -16 16 34 -16 29 18 .... -126 0 0 -16 27 44 4 3 55.4 2 94 -18 -16 24 34 -16 30 53 -16 21 21 -16 34 6 0.51 -125 0 0 -16 32 53 4 3 54.9 3 93 -18 -16 29 44 -16 36 3 -16 26 31 -16 39 16 0.57 -124 0 0 -16 38 24 4 3 54.3 4 93 -19 -16 35 15 -16 41 34 -16 32 2 -16 44 47 0.59 -123 0 0 -16 44 17 4 3 53.5 5 93 -20 -16 41 7 -16 47 27 -16 37 54 -16 50 40 0.61 -122 0 0 -16 50 31 4 3 52.5 6 93 -21 -16 47 21 -16 53 40 -16 44 8 -16 56 54 0.62 -121 0 0 -16 57 5 4 3 51.3 7 92 -22 -16 53 56 -17 0 15 -16 50 42 -17 3 29 0.62 -120 0 0 -17 4 1 4 3 50.0 8 92 -23 -17 0 51 -17 7 11 -16 57 38 -17 10 25 0.63 -119 0 0 -17 11 18 4 3 48.4 9 92 -24 -17 8 8 -17 14 28 -17 4 54 -17 17 42 0.63 -118 0 0 -17 18 55 4 3 46.7 10 91 -25 -17 15 45 -17 22 5 -17 12 31 -17 25 19 0.64 -117 0 0 -17 26 53 4 3 44.9 10 91 -25 -17 23 42 -17 30 3 -17 20 29 -17 33 17 0.64 -116 0 0 -17 35 11 4 3 42.8 11 91 -26 -17 32 0 -17 38 21 -17 28 46 -17 41 36 0.64 -115 0 0 -17 43 49 4 3 40.6 12 90 -27 -17 40 38 -17 46 59 -17 37 24 -17 50 14 0.64 -114 0 0 -17 52 47 4 3 38.2 13 90 -28 -17 49 36 -17 55 57 -17 46 22 -17 59 12 0.64 -113 0 0 -18 2 4 4 3 35.6 14 90 -29 -17 58 53 -18 5 15 -17 55 39 -18 8 30 0.64 -112 0 0 -18 11 41 4 3 32.9 15 89 -30 -18 8 30 -18 14 52 -18 5 15 -18 18 7 0.65 -111 0 0 -18 21 37 4 3 30.0 16 89 -30 -18 18 26 -18 24 49 -18 15 11 -18 28 4 0.65 -110 0 0 -18 31 52 4 3 26.9 17 89 -31 -18 28 41 -18 35 4 -18 25 26 -18 38 19 0.65 -109 0 0 -18 42 26 4 3 23.7 18 88 -32 -18 39 15 -18 45 38 -18 36 0 -18 48 54 0.65 -108 0 0 -18 53 19 4 3 20.3 19 88 -33 -18 50 7 -18 56 31 -18 46 52 -18 59 47 0.65 -107 0 0 -19 4 30 4 3 16.7 20 87 -33 -19 1 18 -19 7 42 -18 58 3 -19 10 58 0.65 -106 0 0 -19 15 59 4 3 13.0 21 87 -34 -19 12 47 -19 19 11 -19 9 31 -19 22 27 0.65 -105 0 0 -19 27 46 4 3 9.1 22 87 -35 -19 24 33 -19 30 58 -19 21 17 -19 34 14 0.65 -104 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80 -43 -22 22 32 -22 29 3 -22 19 14 -22 32 22 0.65 - 91 0 0 -22 41 14 4 1 59.6 34 79 -44 -22 37 58 -22 44 29 -22 34 39 -22 47 49 0.66 - 90 0 0 -22 56 53 4 1 53.6 35 78 -44 -22 53 37 -23 0 9 -22 50 18 -23 3 28 0.66 - 89 0 0 -23 12 45 4 1 47.6 36 78 -45 -23 9 29 -23 16 1 -23 6 10 -23 19 21 0.66 - 88 0 0 -23 28 50 4 1 41.4 36 77 -45 -23 25 34 -23 32 6 -23 22 14 -23 35 26 0.66 - 87 0 0 -23 45 7 4 1 35.1 37 76 -46 -23 41 51 -23 48 24 -23 38 31 -23 51 44 0.66 - 86 0 0 -24 1 36 4 1 28.6 38 76 -46 -23 58 19 -24 4 53 -23 54 59 -24 8 13 0.66 - 85 0 0 -24 18 16 4 1 22.1 39 75 -46 -24 15 0 -24 21 33 -24 11 39 -24 24 54 0.66 - 84 0 0 -24 35 8 4 1 15.5 40 74 -47 -24 31 51 -24 38 25 -24 28 30 -24 41 46 0.66 - 83 0 0 -24 52 10 4 1 8.8 40 73 -47 -24 48 53 -24 55 27 -24 45 32 -24 58 48 0.66 - 82 0 0 -25 9 22 4 1 2.0 41 72 -48 -25 6 5 -25 12 40 -25 2 44 -25 16 1 0.66 - 81 0 0 -25 26 45 4 0 55.0 42 71 -48 -25 23 27 -25 30 3 -25 20 6 -25 33 24 0.66 - 80 0 0 -25 44 17 4 0 48.0 43 70 -48 -25 40 59 -25 47 35 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8 0.68 17 59 59 -50 34 2 3 50 16.4 27 299 -4 -50 30 51 -50 37 13 -50 27 36 -50 40 28 0.68 18 59 59 -50 40 9 3 50 13.2 26 298 -3 -50 36 58 -50 43 20 -50 33 43 -50 46 35 0.68 19 59 59 -50 46 1 3 50 10.1 26 297 -2 -50 42 50 -50 49 12 -50 39 36 -50 52 27 0.68 20 59 59 -50 51 39 3 50 7.0 25 297 -2 -50 48 29 -50 54 50 -50 45 15 -50 58 4 0.68 21 59 59 -50 57 3 3 50 4.0 24 296 -1 -50 53 53 -51 0 14 -50 50 39 -51 3 28 0.68 22 59 59 -51 2 13 3 50 1.1 24 295 0 -50 59 3 -51 5 23 -50 55 49 -51 8 38 0.68 23 59 59 -51 7 9 3 49 58.3 23 294 0 -51 3 58 -51 10 19 -51 0 45 -51 13 33 0.68 24 59 59 -51 11 50 3 49 55.6 23 293 1 -51 8 40 -51 15 0 -51 5 26 -51 18 14 0.68 25 59 59 -51 16 17 3 49 52.9 22 292 1 -51 13 7 -51 19 27 -51 9 54 -51 22 40 0.68 26 59 59 -51 20 30 3 49 50.3 21 291 2 -51 17 20 -51 23 40 -51 14 7 -51 26 53 0.68 27 59 59 -51 24 28 3 49 47.8 21 291 3 -51 21 19 -51 27 38 -51 18 6 -51 30 51 0.68 28 59 59 -51 28 13 3 49 45.3 20 290 3 -51 25 4 -51 31 23 -51 21 51 -51 34 36 0.68 29 59 59 -51 31 43 3 49 43.0 20 289 4 -51 28 34 -51 34 53 -51 25 21 -51 38 6 0.68 30 59 59 -51 34 59 3 49 40.7 19 288 4 -51 31 50 -51 38 9 -51 28 37 -51 41 21 0.68 31 59 59 -51 38 1 3 49 38.4 18 287 5 -51 34 52 -51 41 10 -51 31 40 -51 44 23 0.68 32 59 59 -51 40 49 3 49 36.3 18 287 6 -51 37 40 -51 43 58 -51 34 27 -51 47 11 0.68 33 59 59 -51 43 22 3 49 34.2 17 286 6 -51 40 13 -51 46 31 -51 37 1 -51 49 44 0.68 34 59 59 -51 45 41 3 49 32.1 17 285 7 -51 42 33 -51 48 50 -51 39 20 -51 52 3 0.68 35 59 59 -51 47 46 3 49 30.2 16 284 8 -51 44 38 -51 50 55 -51 41 26 -51 54 8 0.68 36 59 59 -51 49 37 3 49 28.3 15 283 8 -51 46 29 -51 52 46 -51 43 17 -51 55 58 0.68 37 59 59 -51 51 14 3 49 26.5 15 282 9 -51 48 5 -51 54 23 -51 44 53 -51 57 35 0.68 38 59 59 -51 52 36 3 49 24.8 14 282 9 -51 49 28 -51 55 45 -51 46 16 -51 58 57 0.68 39 59 59 -51 53 45 3 49 23.1 14 281 10 -51 50 36 -51 56 53 -51 47 24 -52 0 5 0.68 40 59 59 -51 54 38 3 49 21.6 13 280 11 -51 51 30 -51 57 47 -51 48 18 -52 0 59 0.69 41 59 59 -51 55 18 3 49 20.0 12 279 11 -51 52 10 -51 58 27 -51 48 58 -52 1 39 0.69 42 59 59 -51 55 44 3 49 18.6 12 278 12 -51 52 35 -51 58 52 -51 49 24 -52 2 4 0.69 44 0 0 -51 55 55 3 49 17.2 11 278 12 -51 52 47 -51 59 4 -51 49 35 -52 2 16 0.69 45 0 0 -51 55 52 3 49 15.9 10 277 13 -51 52 44 -51 59 1 -51 49 32 -52 2 13 0.69 46 0 0 -51 55 35 3 49 14.7 10 276 14 -51 52 26 -51 58 43 -51 49 15 -52 1 55 0.69 47 0 0 -51 55 3 3 49 13.5 9 275 14 -51 51 55 -51 58 12 -51 48 43 -52 1 24 0.69 48 0 0 -51 54 17 3 49 12.5 9 274 15 -51 51 9 -51 57 26 -51 47 57 -52 0 38 0.69 49 0 0 -51 53 17 3 49 11.4 8 274 16 -51 50 9 -51 56 26 -51 46 57 -51 59 38 0.70 50 0 0 -51 52 3 3 49 10.5 7 273 16 -51 48 54 -51 55 11 -51 45 43 -51 58 23 0.70 51 0 0 -51 50 34 3 49 9.6 7 272 17 -51 47 25 -51 53 42 -51 44 14 -51 56 54 0.70 52 0 0 -51 48 50 3 49 8.8 6 271 17 -51 45 42 -51 51 59 -51 42 30 -51 55 11 0.70 53 0 0 -51 46 53 3 49 8.1 6 271 18 -51 43 44 -51 50 1 -51 40 32 -51 53 14 0.71 54 0 0 -51 44 41 3 49 7.5 5 270 19 -51 41 32 -51 47 49 -51 38 20 -51 51 2 0.71 55 0 0 -51 42 14 3 49 6.9 4 269 19 -51 39 5 -51 45 23 -51 35 53 -51 48 35 0.72 56 0 0 -51 39 33 3 49 6.4 4 268 20 -51 36 24 -51 42 42 -51 33 12 -51 45 54 0.73 57 0 0 -51 36 37 3 49 6.0 3 267 21 -51 33 29 -51 39 46 -51 30 17 -51 42 59 0.74 58 0 0 -51 33 27 3 49 5.7 2 267 21 -51 30 18 -51 36 36 -51 27 6 -51 39 49 0.77 59 0 0 -51 30 3 3 49 5.4 2 266 22 -51 26 54 -51 33 12 -51 23 41 -51 36 24 0.80 60 0 0 -51 26 23 3 49 5.2 1 265 22 -51 23 14 -51 29 33 -51 20 2 -51 32 45 0.87 61 0 0 -51 22 29 3 49 5.1 1 264 23 -51 19 20 -51 25 39 -51 16 8 -51 28 52 1.09 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: TYC 4934-01218-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 11 49 41.7355 DE: -03 54 03.469 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 11 49 41.7357 DE: -03 54 03.471 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.5 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1643) Brown asteroid class: approx. diameter [km]: 10 approx. diameter ["]: 0.007 distance from Earth [AU]: 1.98550 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 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): 0.010", 0.003", 113.254° remarks: * orbital elements for (1643)Brown : Mean anomaly = 141.1439873693 deg Arg. of pericenter = 90.0712262351 deg Long. of node = 287.8600494579 deg Inclination = 3.5125928710 deg Eccentricity = 0.2022810760 Semimajor axis = 2.4888377877 AU Perihelion dist = 1.9853930020 AU Mag: H = 12.50, G = 0.15 Epoch of elements : MJD 60364.16423825 TDT (2024 Feb 24.1642) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr24,0.81,2024,2,24,3.941722,-0.167563,-0.529399,-6.401580,2.017282,-0.002065,0.001364,0.000001,0.000000 -34.9277,-4.0366,124.20,-9.67,False TYC 4934-01218-1,11.82825987,-3.9009634,12.06,11.51,11.21,0.0,0,,11.84910631,-4.0366383,5.38,5.23,0,0,0 1643,Brown,16.88,9.656,1.9855,0,0,-1.895,8.94,,0.8,0 0,141.1028,2024,2,24,90.0712,287.8600,3.5126,0.20228,2.48884,1.98539,12.50,5.0,0.15 1.509,0.0103,0.0033,113,0.0034,Known errors,1.60,0,-1,-1 20240224_1218-1,60138.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 04:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org