IOTA/IOTA-ES occultation update for (538) Friederike / TYC 6308-00936-1 event on 2022 Oct 24, 23:34 UT Visible from South America Summary ------- On 2022 Oct 24 UT, the 74.1 km diameter asteroid (538) Friederike will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.59 mag to 15.19 mag (the magnitude of the asteroid) for at most 3.120 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: 2022 Oct 24, 23:29 - 2022 Oct 24, 23:38 * geocentric midpoint of event [JD]: 2459877.48196929 * magnitude of target star: 11.64 * magnitude drop [mag]: 3.59 * estimated maximum duration [s]: 3.120 * Moon: 0 % sunlit, 83° distance * Sun: 77° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 74 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.004", 91°) * approx speed of asteroid's shadow [km/s]: 23.7627 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6308-00936-1 by 538 Friederike on 2022 Oct 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 174 0 0 - 2 46 31 23 29 33.4 1 111 77 - 3 8 1 - 2 25 0 - 3 12 32 - 2 20 29 .... 175 0 0 - 3 9 21 23 29 33.6 2 111 78 - 3 30 51 - 2 47 51 - 3 35 22 - 2 43 20 0.08 176 0 0 - 3 32 9 23 29 33.8 3 111 79 - 3 53 39 - 3 10 39 - 3 58 10 - 3 6 8 0.06 177 0 0 - 3 54 54 23 29 34.1 4 111 80 - 4 16 23 - 3 33 24 - 4 20 54 - 3 28 53 0.05 178 0 0 - 4 17 35 23 29 34.5 5 110 80 - 4 39 4 - 3 56 6 - 4 43 35 - 3 51 35 0.05 179 0 0 - 4 40 13 23 29 35.0 6 110 81 - 5 1 42 - 4 18 44 - 5 6 12 - 4 14 13 0.05 -180 0 0 - 5 2 46 23 29 35.6 7 110 82 - 5 24 14 - 4 41 18 - 5 28 45 - 4 36 47 0.04 -179 0 0 - 5 25 14 23 29 36.3 8 110 83 - 5 46 42 - 5 3 46 - 5 51 13 - 4 59 16 0.04 -178 0 0 - 5 47 37 23 29 37.1 9 110 84 - 6 9 4 - 5 26 10 - 6 13 35 - 5 21 39 0.04 -177 0 0 - 6 9 53 23 29 37.9 11 110 84 - 6 31 20 - 5 48 27 - 6 35 50 - 5 43 57 0.04 -176 0 0 - 6 32 4 23 29 38.9 12 110 84 - 6 53 30 - 6 10 38 - 6 58 0 - 6 6 8 0.04 -175 0 0 - 6 54 7 23 29 40.0 13 110 85 - 7 15 32 - 6 32 42 - 7 20 2 - 6 28 12 0.04 -174 0 0 - 7 16 2 23 29 41.1 14 110 85 - 7 37 27 - 6 54 38 - 7 41 56 - 6 50 8 0.04 -173 0 0 - 7 37 50 23 29 42.3 15 110 84 - 7 59 13 - 7 16 26 - 8 3 43 - 7 11 57 0.03 -172 0 0 - 7 59 29 23 29 43.6 16 109 84 - 8 20 51 - 7 38 6 - 8 25 21 - 7 33 37 0.03 -171 0 0 - 8 20 59 23 29 45.0 17 109 83 - 8 42 20 - 7 59 37 - 8 46 50 - 7 55 8 0.03 -170 0 0 - 8 42 19 23 29 46.5 18 109 83 - 9 3 40 - 8 20 59 - 9 8 9 - 8 16 30 0.03 -169 0 0 - 9 3 30 23 29 48.1 19 109 82 - 9 24 49 - 8 42 10 - 9 29 18 - 8 37 41 0.03 -168 0 0 - 9 24 30 23 29 49.7 20 109 81 - 9 45 49 - 9 3 11 - 9 50 17 - 8 58 43 0.03 -167 0 0 - 9 45 19 23 29 51.5 21 109 80 -10 6 37 - 9 24 2 -10 11 5 - 9 19 34 0.03 -166 0 0 -10 5 57 23 29 53.3 22 108 80 -10 27 14 - 9 44 41 -10 31 42 - 9 40 13 0.03 -165 0 0 -10 26 24 23 29 55.2 23 108 79 -10 47 39 -10 5 9 -10 52 7 -10 0 41 0.03 -164 0 0 -10 46 38 23 29 57.2 24 108 78 -11 7 52 -10 25 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256 -27 -16 15 2 -15 33 23 -16 19 24 -15 29 0 0.03 - 54 0 0 -15 38 16 23 37 0.8 48 256 -28 -15 59 8 -15 17 25 -16 3 30 -15 13 3 0.03 - 53 0 0 -15 22 3 23 37 4.3 47 256 -29 -15 42 56 -15 1 10 -15 47 19 -14 56 47 0.03 - 52 0 0 -15 5 32 23 37 7.7 46 256 -30 -15 26 26 -14 44 38 -15 30 50 -14 40 15 0.03 - 51 0 0 -14 48 44 23 37 11.1 45 255 -31 -15 9 40 -14 27 48 -15 14 3 -14 23 25 0.03 - 50 0 0 -14 31 39 23 37 14.5 44 255 -32 -14 52 36 -14 10 42 -14 57 0 -14 6 18 0.03 - 49 0 0 -14 14 17 23 37 17.8 43 255 -33 -14 35 16 -13 53 18 -14 39 40 -13 48 54 0.03 - 48 0 0 -13 56 39 23 37 21.1 42 254 -34 -14 17 39 -13 35 39 -14 22 4 -13 31 14 0.03 - 47 0 0 -13 38 44 23 37 24.3 41 254 -35 -13 59 46 -13 17 43 -14 4 11 -13 13 18 0.03 - 46 0 0 -13 20 34 23 37 27.4 40 254 -36 -13 41 37 -12 59 31 -13 46 3 -12 55 6 0.03 - 45 0 0 -13 2 8 23 37 30.5 39 254 -37 -13 23 13 -12 41 4 -13 27 39 -12 36 38 0.03 - 44 0 0 -12 43 27 23 37 33.5 38 253 -38 -13 4 34 -12 22 21 -13 8 59 -12 17 55 0.03 - 43 0 0 -12 24 32 23 37 36.4 37 253 -39 -12 45 39 -12 3 24 -12 50 5 -11 58 58 0.03 - 42 0 0 -12 5 21 23 37 39.3 36 253 -40 -12 26 30 -11 44 12 -12 30 57 -11 39 46 0.03 - 41 0 0 -11 45 57 23 37 42.1 35 253 -42 -12 7 7 -11 24 47 -12 11 34 -11 20 20 0.03 - 40 0 0 -11 26 19 23 37 44.9 34 253 -43 -11 47 30 -11 5 7 -11 51 57 -11 0 40 0.03 - 39 0 0 -11 6 27 23 37 47.6 33 252 -44 -11 27 40 -10 45 14 -11 32 7 -10 40 47 0.03 - 38 0 0 -10 46 22 23 37 50.2 32 252 -45 -11 7 37 -10 25 8 -11 12 4 -10 20 41 0.03 - 37 0 0 -10 26 5 23 37 52.7 31 252 -46 -10 47 20 -10 4 50 -10 51 48 -10 0 22 0.03 - 36 0 0 -10 5 35 23 37 55.2 30 252 -47 -10 26 52 - 9 44 19 -10 31 20 - 9 39 51 0.03 - 35 0 0 - 9 44 54 23 37 57.6 28 252 -48 -10 6 12 - 9 23 37 -10 10 41 - 9 19 8 0.03 - 34 0 0 - 9 24 2 23 37 59.9 27 251 -49 - 9 45 21 - 9 2 43 - 9 49 49 - 8 58 14 0.03 - 33 0 0 - 9 2 58 23 38 2.1 26 251 -50 - 9 24 18 - 8 41 38 - 9 28 47 - 8 37 9 0.03 - 32 0 0 - 8 41 44 23 38 4.3 25 251 -51 - 9 3 5 - 8 20 23 - 9 7 34 - 8 15 54 0.03 - 31 0 0 - 8 20 20 23 38 6.4 24 251 -52 - 8 41 42 - 7 58 58 - 8 46 12 - 7 54 29 0.03 - 30 0 0 - 7 58 47 23 38 8.4 23 251 -53 - 8 20 10 - 7 37 24 - 8 24 39 - 7 32 54 0.03 - 29 0 0 - 7 37 4 23 38 10.3 22 251 -54 - 7 58 28 - 7 15 40 - 8 2 58 - 7 11 11 0.03 - 28 0 0 - 7 15 13 23 38 12.1 21 251 -55 - 7 36 38 - 6 53 48 - 7 41 8 - 6 49 19 0.03 - 27 0 0 - 6 53 14 23 38 13.9 20 250 -56 - 7 14 39 - 6 31 48 - 7 19 10 - 6 27 18 0.03 - 26 0 0 - 6 31 7 23 38 15.5 19 250 -57 - 6 52 33 - 6 9 41 - 6 57 4 - 6 5 11 0.03 - 25 0 0 - 6 8 53 23 38 17.1 18 250 -58 - 6 30 20 - 5 47 26 - 6 34 51 - 5 42 56 0.03 - 24 0 0 - 5 46 33 23 38 18.6 17 250 -59 - 6 8 0 - 5 25 5 - 6 12 31 - 5 20 35 0.04 - 23 0 0 - 5 24 6 23 38 20.0 16 250 -60 - 5 45 35 - 5 2 38 - 5 50 5 - 4 58 8 0.04 - 22 0 0 - 5 1 34 23 38 21.3 15 250 -61 - 5 23 3 - 4 40 5 - 5 27 34 - 4 35 35 0.04 - 21 0 0 - 4 38 57 23 38 22.6 14 250 -62 - 5 0 27 - 4 17 28 - 5 4 57 - 4 12 57 0.04 - 20 0 0 - 4 16 16 23 38 23.7 13 250 -63 - 4 37 45 - 3 54 46 - 4 42 16 - 3 50 15 0.04 - 19 0 0 - 3 53 30 23 38 24.7 11 250 -64 - 4 15 0 - 3 32 0 - 4 19 31 - 3 27 29 0.04 - 18 0 0 - 3 30 41 23 38 25.7 10 250 -65 - 3 52 12 - 3 9 11 - 3 56 43 - 3 4 40 0.04 - 17 0 0 - 3 7 50 23 38 26.6 9 249 -66 - 3 29 20 - 2 46 19 - 3 33 52 - 2 41 48 0.04 - 16 0 0 - 2 44 56 23 38 27.3 8 249 -67 - 3 6 27 - 2 23 25 - 3 10 58 - 2 18 54 0.04 - 15 0 0 - 2 22 0 23 38 28.0 7 249 -68 - 2 43 31 - 2 0 29 - 2 48 2 - 1 55 58 0.05 - 14 0 0 - 1 59 3 23 38 28.6 6 249 -69 - 2 20 34 - 1 37 32 - 2 25 5 - 1 33 1 0.05 - 13 0 0 - 1 36 5 23 38 29.1 5 249 -70 - 1 57 37 - 1 14 35 - 2 2 8 - 1 10 3 0.06 - 12 0 0 - 1 13 8 23 38 29.5 4 249 -71 - 1 34 39 - 0 51 37 - 1 39 10 - 0 47 6 0.06 - 11 0 0 - 0 50 10 23 38 29.8 3 249 -72 - 1 11 41 - 0 28 40 - 1 16 13 - 0 24 8 0.08 - 10 0 0 - 0 27 14 23 38 30.0 2 249 -73 - 0 48 45 - 0 5 43 - 0 53 16 - 0 1 12 0.11 - 9 0 0 - 0 4 19 23 38 30.1 1 249 -74 - 0 25 50 0 17 11 - 0 30 21 0 21 42 0.22 Uncertainty in time = +/- 1 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: TYC 6308-00936-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 17 42.0090 DE: -20 46 47.497 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 17 42.0090 DE: -20 46 47.497 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (538) Friederike asteroid class: approx. diameter [km]: 74 approx. diameter ["]: 0.035 distance from Earth [AU]: 2.88080 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#64 date of fit: 2022 Sep 23 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", 0.004", 91.492° remarks: * orbital elements for (538)Friederike : Mean anomaly = 315.3780856438 deg Arg. of pericenter = 227.5454701925 deg Long. of node = 141.1648756368 deg Inclination = 6.5222302985 deg Eccentricity = 0.1709934534 Semimajor axis = 3.1562561315 AU Perihelion dist = 2.6165569958 AU Mag: H = 9.63, G = 0.15 Epoch of elements : MJD 59876.98194445 TDT (2022 Oct 24.9819) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#642022Sep23,3.12,2022,10,24,23.567263,0.001955,-0.020699,13.408318,0.327391,0.005652,0.000799,0.000000,0.000000 -97.0976,-20.7396,-177.47,-12.01,False TYC 6308-00936-1,19.29500253,-20.7798603,0.00,11.64,0.00,0.0,0,,19.31716856,-20.7396356,3.59,0.00,0,0,0 538,Friederike,15.19,74.1,2.8808,0,0,2.918,1.00,,3.8,0 0,315.2055,2022,10,24,227.5455,141.1649,6.5222,0.17099,3.15626,2.61656,9.63,5.0,0.15 1.105,0.0133,0.0037,91,0.0037,Known errors,-1.00,-1,-1,-1 20221024_0936-1,59868.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org