IOTA/IOTA-ES occultation update for (747) Winchester / TYC 0055-00850-1 event on 2021 Feb 17, 23:09 UT Visible from South America Summary ------- On 2021 Feb 17 UT, the 168.6 km diameter asteroid (747) Winchester will occult a 8.8 mag star in the constellation Cetus 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 3.43 mag to 12.13 mag (the magnitude of the asteroid) for at most 5.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, astrometry for the asteroid kindly provided by Bill Owen, 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: 2021 Feb 17, 23:06 - 2021 Feb 17, 23:12 * geocentric midpoint of event [JD]: 2459263.46489167 * magnitude of target star: 8.75 * magnitude drop [mag]: 3.43 * estimated maximum duration [s]: 5.5 * Moon: 33 % sunlit, 14° distance * Sun: 76° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 196 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.007", 72°) * approx speed of asteroid's shadow [km/s]: 30.6667 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0055-00850-1 by 747 Winchester on 2021 Feb 17 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 -173 0 0 -63 58 9 23 6 28.7 0 85 37 -64 51 32 -63 5 14 -64 59 41 -62 57 15 .... -172 0 0 -63 55 48 23 6 28.7 1 84 37 -64 49 14 -63 2 50 -64 57 24 -62 54 51 0.37 -171 0 0 -63 53 9 23 6 28.7 1 83 37 -64 46 39 -63 0 8 -64 54 49 -62 52 8 0.46 -170 0 0 -63 50 12 23 6 28.8 2 82 38 -64 43 46 -62 57 7 -64 51 56 -62 49 6 0.49 -169 0 0 -63 46 57 23 6 28.8 2 81 38 -64 40 35 -62 53 48 -64 48 46 -62 45 47 0.51 -168 0 0 -63 43 23 23 6 28.9 3 81 38 -64 37 7 -62 50 10 -64 45 18 -62 42 8 0.53 -167 0 0 -63 39 32 23 6 29.0 3 80 38 -64 33 20 -62 46 14 -64 41 33 -62 38 11 0.54 -166 0 0 -63 35 22 23 6 29.1 3 79 38 -64 29 16 -62 41 59 -64 37 29 -62 33 55 0.54 -165 0 0 -63 30 53 23 6 29.2 4 78 38 -64 24 53 -62 37 24 -64 33 7 -62 29 20 0.55 -164 0 0 -63 26 6 23 6 29.4 4 77 38 -64 20 12 -62 32 31 -64 28 27 -62 24 25 0.55 -163 0 0 -63 21 0 23 6 29.5 5 76 38 -64 15 12 -62 27 18 -64 23 29 -62 19 12 0.56 -162 0 0 -63 15 34 23 6 29.7 5 75 38 -64 9 54 -62 21 46 -64 18 11 -62 13 38 0.56 -161 0 0 -63 9 49 23 6 29.9 6 74 38 -64 4 16 -62 15 54 -64 12 35 -62 7 45 0.56 -160 0 0 -63 3 45 23 6 30.1 6 73 39 -63 58 20 -62 9 42 -64 6 40 -62 1 32 0.56 -159 0 0 -62 57 21 23 6 30.3 7 73 39 -63 52 4 -62 3 10 -64 0 25 -61 54 59 0.57 -158 0 0 -62 50 37 23 6 30.5 7 72 39 -63 45 29 -61 56 17 -63 53 51 -61 48 6 0.57 -157 0 0 -62 43 33 23 6 30.8 8 71 39 -63 38 34 -61 49 5 -63 46 57 -61 40 51 0.57 -156 0 0 -62 36 8 23 6 31.1 8 70 39 -63 31 18 -61 41 31 -63 39 44 -61 33 16 0.57 -155 0 0 -62 28 23 23 6 31.3 9 69 39 -63 23 43 -61 33 36 -63 32 10 -61 25 20 0.57 -154 0 0 -62 20 17 23 6 31.7 9 68 39 -63 15 47 -61 25 20 -63 24 15 -61 17 2 0.57 -153 0 0 -62 11 49 23 6 32.0 9 67 39 -63 7 30 -61 16 42 -63 15 59 -61 8 23 0.57 -152 0 0 -62 3 0 23 6 32.3 10 66 39 -62 58 51 -61 7 42 -63 7 23 -60 59 22 0.57 -151 0 0 -61 53 49 23 6 32.7 10 65 39 -62 49 52 -60 58 20 -62 58 25 -60 49 58 0.57 -150 0 0 -61 44 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28 - 0 50 53 0.61 - 28 0 0 - 1 36 43 23 11 54.0 29 273 -45 - 2 32 38 - 0 41 22 - 2 41 10 - 0 33 0 0.61 - 27 0 0 - 1 19 20 23 11 56.1 28 273 -46 - 2 15 4 - 0 24 9 - 2 23 35 - 0 15 49 0.61 - 26 0 0 - 1 2 38 23 11 58.2 27 273 -47 - 1 58 12 - 0 7 37 - 2 6 41 0 0 41 0.61 - 25 0 0 - 0 46 38 23 12 0.1 26 273 -48 - 1 42 2 0 8 14 - 1 50 30 0 16 30 0.61 - 24 0 0 - 0 31 19 23 12 2.0 25 272 -49 - 1 26 34 0 23 23 - 1 35 0 0 31 38 0.62 - 23 0 0 - 0 16 42 23 12 3.8 24 272 -50 - 1 11 48 0 37 51 - 1 20 13 0 46 5 0.62 - 22 0 0 - 0 2 47 23 12 5.6 23 272 -51 - 0 57 44 0 51 39 - 1 6 8 0 59 51 0.62 - 21 0 0 0 10 27 23 12 7.3 22 272 -52 - 0 44 22 1 4 45 - 0 52 44 1 12 56 0.62 - 20 0 0 0 23 0 23 12 8.9 21 272 -53 - 0 31 42 1 17 10 - 0 40 2 1 25 20 0.62 - 19 0 0 0 34 52 23 12 10.4 20 272 -54 - 0 19 43 1 28 54 - 0 28 2 1 37 4 0.62 - 18 0 0 0 46 2 23 12 11.8 19 272 -55 - 0 8 25 1 39 58 - 0 16 44 1 48 6 0.62 - 17 0 0 0 56 31 23 12 13.2 18 272 -56 0 2 10 1 50 21 - 0 6 7 1 58 28 0.62 - 16 0 0 1 6 19 23 12 14.5 17 272 -57 0 12 4 2 0 3 0 3 48 2 8 9 0.62 - 15 0 0 1 15 26 23 12 15.7 16 272 -58 0 21 17 2 9 4 0 13 1 2 17 10 0.62 - 14 0 0 1 23 52 23 12 16.9 15 272 -59 0 29 49 2 17 25 0 21 34 2 25 30 0.62 - 13 0 0 1 31 37 23 12 17.9 14 272 -60 0 37 39 2 25 5 0 29 25 2 33 10 0.62 - 12 0 0 1 38 42 23 12 18.9 13 272 -61 0 44 48 2 32 5 0 36 34 2 40 9 0.62 - 11 0 0 1 45 5 23 12 19.8 12 272 -62 0 51 16 2 38 25 0 43 3 2 46 28 0.63 - 10 0 0 1 50 49 23 12 20.7 11 272 -63 0 57 2 2 44 5 0 48 50 2 52 7 0.63 - 9 0 0 1 55 51 23 12 21.5 10 272 -64 1 2 8 2 49 4 0 53 56 2 57 6 0.63 - 8 0 0 2 0 13 23 12 22.2 9 272 -65 1 6 33 2 53 23 0 58 22 3 1 24 0.63 - 7 0 0 2 3 54 23 12 22.8 8 272 -66 1 10 17 2 57 2 1 2 6 3 5 3 0.64 - 6 0 0 2 6 55 23 12 23.4 7 272 -67 1 13 20 3 0 1 1 5 10 3 8 2 0.64 - 5 0 0 2 9 16 23 12 23.8 6 272 -68 1 15 42 3 2 20 1 7 32 3 10 21 0.65 - 4 0 0 2 10 56 23 12 24.3 5 272 -69 1 17 24 3 3 59 1 9 14 3 11 59 0.66 - 3 0 0 2 11 56 23 12 24.6 4 272 -69 1 18 25 3 4 58 1 10 15 3 12 59 0.67 - 2 0 0 2 12 16 23 12 24.8 3 272 -70 1 18 45 3 5 18 1 10 35 3 13 18 0.70 - 1 0 0 2 11 56 23 12 25.0 2 272 -71 1 18 25 3 4 57 1 10 15 3 12 57 0.74 0 0 0 2 10 55 23 12 25.1 1 272 -72 1 17 24 3 3 57 1 9 14 3 11 57 0.88 1 0 0 2 9 15 23 12 25.2 0 272 -73 1 15 43 3 2 17 1 7 33 3 10 18 10.76 Uncertainty in time = +/- 1 secs Prediction of 2020 Dec 31.0 Data for the target star ------------------------ * name: TYC 0055-00850-1 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 07 44.6356 DE: +01 50 50.967 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 07 44.6352 DE: +01 50 50.965 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 8.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (747) Winchester asteroid class: approx. diameter [km]: 169 approx. diameter ["]: 0.115 distance from Earth [AU]: 2.02950 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: Preston date of fit: 2020 Dec 31 source of used astrometry: MPC, FASTT, TMO number of used observations: 2798 number of rejected observations: 38 time covered by the observations: 1960 Apr 19 - 2020 Oct 21 1 sigma uncertainty ellipse (major, minor, PA): 0.021", 0.007", 72.1° remarks: * orbital elements for (747)Winchester : Mean anomaly = 12.41797934 deg Arg. of pericenter = 277.43167646 deg Long. of node = 129.10323182 deg Inclination = 18.21790119 deg Eccentricity = 0.33911192 Semimajor axis = 3.00019351 AU Perihelion dist = 1.98279213 AU Mag: H = 7.80, G = 0.15 Epoch of elements : MJD 59262.96500000 TDT (2021 Feb 17.9650) ------ occelmnt file for Occult BEGIN ----------------------------------- Preston2020Dec31,5.5,2021,2,17,23.1574,0.27876,-0.43015,14.52056,9.42122,0.00519,0.00114,0.00000,0.00000 -88.2973,1.9252,-163.87,-11.64,False TYC 0055-00850-1,3.12906538,1.8474905,0.00,8.75,0.00,0.0,0,,3.14697712,1.9251865 747,Winchester,12.13,168.6,2.0295,0,0,4.197,40.82,,10.2 0,12.2350,2021,2,17,277.4317,129.1032,18.2179,0.33911,3.00019,1.98279,7.80,5.0,0.15 1.076,0.0210,0.0070,72,0.0087,Known errors 20210217_0850-1,59214.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2020 Dec 31, 01:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org