IOTA/IOTA-ES occultation update for (8226) 1996 TF7 / TYC 0045-01252-1 event on 2012 Nov 14, 08:20 UT Visible from Canada Summary ------- On 2012 Nov 14 UT, the 15 km diameter asteroid (8226) 1996 TF7 will occult a 10.2 mag star in the constellation Cetus for observers along a path across Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 15.7 mag (the magnitude of the asteroid) for at most 1.4 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 12 * date and approx. time of event: 2012 Nov 14, 08:12 - 2012 Nov 14, 08:29 UT * geocentric midpoint of event [JD]: 2456245.84780833 * magnitude of target star: 10.2 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.4 * Moon: 0 % sunlit, 156° distance * Sun: 162° distance * rough path description: Canada The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 5.41 * 1 sigma uncertainty interval [seconds]: +/- 12.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .105 +/- .059) * 1 sigma uncertainty ellipse (major, minor, PA): ( .106", .057", 82° ) * approx speed of asteroid's shadow [km/s]: 10.3023 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0045-01252-1 by 8226 1996 TF7 on 2012 Nov 14 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 138 0 0 4 9 18 8 29 26 12 85 -1 4 14 8 4 4 29 5 6 40 3 12 31 139 0 0 4 22 40 8 29 23 13 85 -2 4 27 31 4 17 50 5 20 8 3 25 47 140 0 0 4 36 36 8 29 20 14 85 -3 4 41 27 4 31 45 5 34 10 3 39 36 141 0 0 4 51 5 8 29 17 15 85 -4 4 55 56 4 46 13 5 48 46 3 53 58 142 0 0 5 6 7 8 29 13 16 86 -5 5 10 59 5 1 15 6 3 55 4 8 53 143 0 0 5 21 42 8 29 9 17 86 -6 5 26 35 5 16 50 6 19 38 4 24 21 144 0 0 5 37 50 8 29 6 18 86 -7 5 42 44 5 32 57 6 35 54 4 40 22 145 0 0 5 54 31 8 29 1 19 86 -8 5 59 25 5 49 38 6 52 43 4 56 55 146 0 0 6 11 45 8 28 57 20 86 -9 6 16 39 6 6 50 7 10 4 5 14 1 147 0 0 6 29 30 8 28 53 21 86 -10 6 34 26 6 24 35 7 27 58 5 31 38 148 0 0 6 47 48 8 28 48 22 87 -11 6 52 44 6 42 52 7 46 24 5 49 47 149 0 0 7 6 37 8 28 43 23 87 -12 7 11 34 7 1 40 8 5 23 6 8 28 150 0 0 7 25 58 8 28 38 24 87 -13 7 30 55 7 21 0 8 24 52 6 27 40 151 0 0 7 45 50 8 28 32 25 87 -14 7 50 48 7 40 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Uncertainty in time = +/- 13 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 0045-01252-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 28 08.8909 DE: +05 35 47.534 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .031 ) * V mag [mag]: 10.2 * B mag [mag]: 10.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (8226) 1996 TF7 approx. diameter [km]: 15 approx. diameter ["]: .012 distance from Earth [AU]: 1.74300 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 974 number of rejected observations: 9 time covered by the observations: 1978 Mar 05 - 2012 Sep 27 1 sigma uncertainty ellipse (major, minor, PA): 0.101, 0.048, 81° remarks: * orbital elements for (8226) 1996 TF7 : Mean anomaly = 12.23394329 deg Arg. of pericenter = 198.15626902 deg Long. of node = 189.29281997 deg Inclination = 10.06768340 deg Eccentricity = 0.10633816 Semimajor axis = 3.01347768 AU Perihelion dist = 2.69302999 AU Mag: H = 11.86, G = 0.15 Epoch of elements : MJD 56245.34700000 TDT (2012 Nov 14.347) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 14 8226 1996 TF7 8h 20.8m UT 10.2 2 28 8.891 5 35 47.53TYC 0045-01252-1 10.6 15.7 15 1.4 1.743 -1.724 -14.05 -142.0165 5.601 50.91 -18.36 8.3474 -0.24544 0.44990 -5.10364 -2.78678 0.00124 0.00131 2000 11.226519201211 9.00000198.156269189.292820 10.0676830.10633816 3.0134777 2.693030011.8 5.00.15 RATE 1.8840920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.106 0.057 82 6.41 0.064 0 0-1 4 056208.0020121114_1252-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 20:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org