IOTA/IOTA-ES occultation update for (538) Friederike / UCAC4 517-005644 event on 2024 Mar 16, 16:14 UT Visible from Summary ------- On 2024 Mar 16 UT, the 74.165 km diameter asteroid (538) Friederike will occult a 11.9 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.55 mag to 15.38 mag (the magnitude of the asteroid) for at most 2.140 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 Mar 16, 16:11 - 2024 Mar 16, 16:17 * geocentric midpoint of event [JD]: 2460386.17658200 * magnitude of target star: 11.87 * magnitude drop [mag]: 3.55 * estimated maximum duration [s]: 2.140 * Moon: 45 % sunlit, 30° distance * Sun: 56° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 74 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.024", 0.001", 75°) * approx speed of asteroid's shadow [km/s]: 34.6803 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 517-005644 by 538 Friederike on 2024 Mar 16 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 - 91 0 0 -17 48 47 16 11 12.8 0 76 56 -18 9 30 -17 28 3 -18 12 12 -17 25 22 .... - 90 0 0 -17 34 12 16 11 12.9 1 76 57 -17 54 57 -17 13 27 -17 57 39 -17 10 45 -0.07 - 89 0 0 -17 19 16 16 11 13.0 2 75 58 -17 40 3 -16 58 29 -17 42 45 -16 55 47 -0.04 - 88 0 0 -17 4 0 16 11 13.1 3 75 59 -17 24 49 -16 43 11 -17 27 31 -16 40 29 -0.03 - 87 0 0 -16 48 23 16 11 13.3 4 75 60 -17 9 13 -16 27 32 -17 11 56 -16 24 50 -0.03 - 86 0 0 -16 32 26 16 11 13.6 5 74 61 -16 53 18 -16 11 33 -16 56 1 -16 8 51 -0.02 - 85 0 0 -16 16 8 16 11 13.9 6 74 62 -16 37 2 -15 55 14 -16 39 45 -15 52 31 -0.02 - 84 0 0 -15 59 31 16 11 14.3 7 74 63 -16 20 27 -15 38 35 -16 23 10 -15 35 52 -0.02 - 83 0 0 -15 42 34 16 11 14.7 8 74 64 -16 3 31 -15 21 36 -16 6 15 -15 18 52 -0.02 - 82 0 0 -15 25 17 16 11 15.2 9 73 65 -15 46 16 -15 4 17 -15 49 0 -15 1 33 -0.02 - 81 0 0 -15 7 40 16 11 15.8 10 73 66 -15 28 42 -14 46 39 -15 31 25 -14 43 55 -0.01 - 80 0 0 -14 49 45 16 11 16.4 11 73 67 -15 10 48 -14 28 41 -15 13 32 -14 25 57 -0.01 - 79 0 0 -14 31 30 16 11 17.1 12 73 68 -14 52 35 -14 10 25 -14 55 19 -14 7 41 -0.01 - 78 0 0 -14 12 57 16 11 17.8 13 72 69 -14 34 3 -13 51 50 -14 36 48 -13 49 5 -0.01 - 77 0 0 -13 54 5 16 11 18.6 14 72 70 -14 15 13 -13 32 56 -14 17 58 -13 30 11 -0.01 - 76 0 0 -13 34 55 16 11 19.4 15 72 71 -13 56 5 -13 13 44 -13 58 50 -13 10 59 -0.01 - 75 0 0 -13 15 26 16 11 20.3 16 72 72 -13 36 38 -12 54 14 -13 39 24 -12 51 29 -0.01 - 74 0 0 -12 55 41 16 11 21.3 17 71 73 -13 16 54 -12 34 27 -13 19 40 -12 31 41 -0.01 - 73 0 0 -12 35 37 16 11 22.3 18 71 73 -12 56 53 -12 14 22 -12 59 39 -12 11 36 -0.01 - 72 0 0 -12 15 17 16 11 23.4 20 71 74 -12 36 34 -11 54 0 -12 39 20 -11 51 14 -0.01 - 71 0 0 -11 54 40 16 11 24.5 21 71 75 -12 15 59 -11 33 21 -12 18 45 -11 30 35 -0.01 - 70 0 0 -11 33 47 16 11 25.7 22 71 76 -11 55 7 -11 12 26 -11 57 54 -11 9 39 -0.01 - 69 0 0 -11 12 37 16 11 27.0 23 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0.00 35 0 0 22 11 35 16 16 16.8 49 265 -7 21 51 24 22 31 45 21 48 47 22 34 22 0.00 36 0 0 22 16 24 16 16 19.1 48 265 -8 21 56 14 22 36 33 21 53 37 22 39 11 0.00 37 0 0 22 20 50 16 16 21.3 47 266 -9 22 0 41 22 40 59 21 58 4 22 43 36 0.00 38 0 0 22 24 54 16 16 23.5 46 266 -10 22 4 45 22 45 2 22 2 8 22 47 39 0.00 39 0 0 22 28 35 16 16 25.6 45 266 -11 22 8 27 22 48 43 22 5 50 22 51 20 0.00 40 0 0 22 31 53 16 16 27.8 44 267 -12 22 11 46 22 52 1 22 9 9 22 54 38 0.00 41 0 0 22 34 49 16 16 29.8 44 267 -13 22 14 42 22 54 56 22 12 5 22 57 33 0.00 42 0 0 22 37 22 16 16 31.9 43 268 -13 22 17 15 22 57 28 22 14 38 23 0 5 0.00 43 0 0 22 39 32 16 16 33.9 42 268 -14 22 19 25 22 59 38 22 16 48 23 2 15 0.00 44 0 0 22 41 19 16 16 35.9 41 268 -15 22 21 13 23 1 25 22 18 36 23 4 2 0.00 45 0 0 22 42 44 16 16 37.8 40 269 -16 22 22 38 23 2 49 22 20 1 23 5 26 0.00 46 0 0 22 43 46 16 16 39.7 39 269 -17 22 23 40 23 3 51 22 21 3 23 6 28 0.00 47 0 0 22 44 25 16 16 41.6 38 269 -18 22 24 19 23 4 30 22 21 43 23 7 7 0.00 48 0 0 22 44 41 16 16 43.4 37 270 -19 22 24 36 23 4 47 22 21 59 23 7 24 0.00 49 0 0 22 44 35 16 16 45.1 36 270 -20 22 24 30 23 4 41 22 21 53 23 7 18 0.00 50 0 0 22 44 7 16 16 46.9 35 271 -21 22 24 1 23 4 12 22 21 24 23 6 49 0.00 51 0 0 22 43 15 16 16 48.6 34 271 -22 22 23 10 23 3 21 22 20 33 23 5 58 0.00 52 0 0 22 42 1 16 16 50.2 33 271 -23 22 21 55 23 2 7 22 19 19 23 4 44 0.00 53 0 0 22 40 25 16 16 51.9 32 272 -24 22 20 19 23 0 31 22 17 42 23 3 8 0.00 54 0 0 22 38 25 16 16 53.4 31 272 -25 22 18 19 22 58 32 22 15 42 23 1 9 0.00 55 0 0 22 36 4 16 16 55.0 31 273 -25 22 15 57 22 56 10 22 13 20 22 58 47 0.00 56 0 0 22 33 19 16 16 56.5 30 273 -26 22 13 12 22 53 26 22 10 35 22 56 3 0.00 57 0 0 22 30 12 16 16 57.9 29 273 -27 22 10 5 22 50 20 22 7 28 22 52 57 0.00 58 0 0 22 26 43 16 16 59.4 28 274 -28 22 6 35 22 46 51 22 3 58 22 49 28 0.00 59 0 0 22 22 51 16 17 0.7 27 274 -29 22 2 42 22 43 0 22 0 5 22 45 37 0.00 60 0 0 22 18 36 16 17 2.1 26 274 -30 21 58 27 22 38 46 21 55 50 22 41 23 0.00 61 0 0 22 13 59 16 17 3.3 25 275 -31 21 53 49 22 34 9 21 51 12 22 36 47 0.00 62 0 0 22 9 0 16 17 4.6 24 275 -32 21 48 49 22 29 11 21 46 12 22 31 48 0.00 63 0 0 22 3 38 16 17 5.8 23 276 -33 21 43 27 22 23 50 21 40 49 22 26 27 0.00 64 0 0 21 57 54 16 17 7.0 22 276 -34 21 37 41 22 18 6 21 35 4 22 20 44 0.00 65 0 0 21 51 47 16 17 8.1 21 276 -35 21 31 34 22 12 1 21 28 56 22 14 38 0.00 66 0 0 21 45 18 16 17 9.1 20 277 -36 21 25 4 22 5 33 21 22 26 22 8 10 0.00 67 0 0 21 38 27 16 17 10.2 19 277 -37 21 18 12 21 58 42 21 15 34 22 1 20 0.00 68 0 0 21 31 14 16 17 11.1 18 277 -38 21 10 58 21 51 30 21 8 20 21 54 8 -0.01 69 0 0 21 23 38 16 17 12.1 17 278 -38 21 3 21 21 43 55 21 0 43 21 46 34 -0.01 70 0 0 21 15 40 16 17 13.0 16 278 -39 20 55 22 21 35 59 20 52 44 21 38 37 -0.01 71 0 0 21 7 20 16 17 13.8 16 279 -40 20 47 1 21 27 40 20 44 22 21 30 18 -0.01 72 0 0 20 58 38 16 17 14.6 15 279 -41 20 38 18 21 18 59 20 35 39 21 21 38 -0.01 73 0 0 20 49 34 16 17 15.3 14 279 -42 20 29 12 21 9 56 20 26 34 21 12 35 -0.01 74 0 0 20 40 8 16 17 16.0 13 280 -43 20 19 45 21 0 32 20 17 6 21 3 11 -0.01 75 0 0 20 30 21 16 17 16.7 12 280 -44 20 9 56 20 50 45 20 7 17 20 53 24 -0.01 76 0 0 20 20 11 16 17 17.3 11 280 -45 19 59 45 20 40 37 19 57 6 20 43 16 -0.01 77 0 0 20 9 39 16 17 17.8 10 281 -46 19 49 12 20 30 7 19 46 33 20 32 46 -0.01 78 0 0 19 58 46 16 17 18.3 9 281 -47 19 38 18 20 19 15 19 35 38 20 21 55 -0.01 79 0 0 19 47 32 16 17 18.8 8 281 -48 19 27 2 20 8 2 19 24 22 20 10 42 -0.01 80 0 0 19 35 55 16 17 19.2 7 282 -49 19 15 24 19 56 27 19 12 44 19 59 7 -0.01 81 0 0 19 23 58 16 17 19.5 6 282 -50 19 3 25 19 44 31 19 0 44 19 47 11 -0.02 82 0 0 19 11 39 16 17 19.8 5 282 -51 18 51 4 19 32 14 18 48 24 19 34 54 -0.02 83 0 0 18 58 59 16 17 20.1 4 283 -52 18 38 22 19 19 35 18 35 42 19 22 16 -0.02 84 0 0 18 45 57 16 17 20.3 3 283 -53 18 25 20 19 6 35 18 22 39 19 9 16 -0.03 85 0 0 18 32 35 16 17 20.4 2 283 -54 18 11 56 18 53 15 18 9 15 18 55 56 -0.04 86 0 0 18 18 52 16 17 20.5 1 284 -55 17 58 11 18 39 33 17 55 30 18 42 15 -0.08 87 0 0 18 4 48 16 17 20.5 0 284 -56 17 44 6 18 25 31 17 41 24 18 28 13 -0.58 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: UCAC4 517-005644 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 26 05.4746 DE: +13 12 10.971 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 26 05.4744 DE: +13 12 10.970 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (538) Friederike asteroid class: approx. diameter [km]: 74 approx. diameter ["]: 0.031 distance from Earth [AU]: 3.25680 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#67 date of fit: 2023 Apr 27 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): 0.024", 0.001", 75.2° remarks: * orbital elements for (538)Friederike : Mean anomaly = 45.0077752673 deg Arg. of pericenter = 227.2252208334 deg Long. of node = 141.0643011961 deg Inclination = 6.5183795277 deg Eccentricity = 0.1722303406 Semimajor axis = 3.1596384153 AU Perihelion dist = 2.6154528148 AU Mag: H = 9.65, G = 0.15 Epoch of elements : MJD 60385.67658112 TDT (2024 Mar 16.6766) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#672023Apr27,2.14,2024,3,16,16.237968,-0.000489,0.001227,18.577524,6.167427,0.004754,0.000893,-0.000001,0.000000 -6.4582,13.2871,-61.46,-1.36,False UCAC4 517-005644,3.43485408,13.2030475,12.32,11.87,11.63,0.0,0,,3.45688175,13.2870742,3.55,3.35,0,0,0 538,Friederike,15.38,74.165,3.2568,0,0,3.437,16.65,,3.8,0 0,44.8890,2024,3,16,227.2252,141.0643,6.5184,0.17223,3.15964,2.61545,9.65,5.0,0.15 1.065,0.0237,0.0014,75,0.0020,Known errors,0.94,0,-1,-1 20240316_005644,60139.24 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org