IOTA/IOTA-ES occultation update for (771) Libera / TYC 0600-00518-1 event on 2012 Oct 06, 06:26 UT Visible from W Canada Summary ------- On 2012 Oct 06 UT, the 29 km diameter asteroid (771) Libera will occult a 11.5 mag star in the constellation Pegasus for observers along a path across W Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.5 mag (the magnitude of the asteroid) for at most 2.6 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: 46 * date and approx. time of event: 2012 Oct 06, 06:18 - 2012 Oct 06, 06:34 UT * geocentric midpoint of event [JD]: 2456206.76839167 * magnitude of target star: 11.5 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 2.6 * Moon: 69 % sunlit, 75° distance * Sun: 166° distance * rough path description: W Canada The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 1.42 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .050 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .050", .031", 85° ) * approx speed of asteroid's shadow [km/s]: 11.3268 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0600-00518-1 by 771 Libera on 2012 Oct 6 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude 170 0 0 -14 37 8 6 34 27 8 73 0 -14 27 21 -14 46 53 -13 59 29 -15 14 31 171 0 0 -14 13 32 6 34 25 9 73 -1 -14 3 42 -14 23 21 -13 35 40 -14 51 8 172 0 0 -13 48 53 6 34 23 10 72 -2 -13 39 0 -13 58 46 -13 10 48 -14 26 43 173 0 0 -13 23 11 6 34 21 11 72 -3 -13 13 13 -13 33 7 -12 44 51 -14 1 15 174 0 0 -12 56 24 6 34 18 12 72 -4 -12 46 23 -13 6 24 -12 17 49 -13 34 42 175 0 0 -12 28 32 6 34 16 13 72 -5 -12 18 27 -12 38 36 -11 49 41 -13 7 6 176 0 0 -11 59 34 6 34 13 14 72 -6 -11 49 24 -12 9 42 -11 20 27 -12 38 24 177 0 0 -11 29 29 6 34 10 15 71 -7 -11 19 15 -11 39 42 -10 50 5 -12 8 35 178 0 0 -10 58 17 6 34 7 16 71 -8 -10 47 58 -11 8 34 -10 18 35 -11 37 40 179 0 0 -10 25 56 6 34 3 17 71 -9 -10 15 33 -10 36 18 - 9 45 56 -11 5 37 180 0 0 - 9 52 26 6 33 59 18 71 -10 - 9 41 58 -10 2 53 - 9 12 7 -10 32 26 -179 0 0 - 9 17 46 6 33 55 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295 -3 79 26 20 79 5 6 79 56 39 78 35 7 6 0 0 79 8 46 6 18 38 10 296 -3 79 19 30 78 58 4 79 50 5 78 27 49 7 0 0 79 1 32 6 18 37 10 297 -2 79 12 21 78 50 44 79 43 14 78 20 11 8 0 0 78 53 58 6 18 37 9 298 -2 79 4 54 78 43 4 79 36 5 78 12 14 9 0 0 78 46 4 6 18 36 9 299 -2 78 57 7 78 35 4 79 28 37 78 3 56 10 0 0 78 37 50 6 18 36 9 300 -2 78 48 59 78 26 42 79 20 48 77 55 16 11 0 0 78 29 14 6 18 35 9 301 -2 78 40 30 78 17 59 79 12 39 77 46 13 12 0 0 78 20 15 6 18 35 8 302 -1 78 31 38 78 8 53 79 4 9 77 36 46 13 0 0 78 10 52 6 18 35 8 303 -1 78 22 23 77 59 23 78 55 15 77 26 55 14 0 0 78 1 5 6 18 34 8 304 -1 78 12 44 77 49 28 78 45 59 77 16 39 15 0 0 77 50 52 6 18 34 8 305 -1 78 2 39 77 39 7 78 36 17 77 5 55 16 0 0 77 40 12 6 18 33 7 306 0 77 52 7 77 28 19 78 26 10 76 54 44 Uncertainty in time = +/- 4 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 0600-00518-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 07 09.0684 DE: +14 22 45.785 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .039, .026 ) * V mag [mag]: 11.5 * B mag [mag]: 13.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (771) Libera approx. diameter [km]: 29 approx. diameter ["]: .029 distance from Earth [AU]: 1.36800 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 927 number of rejected observations: 48 time covered by the observations: 1913 Nov 27 - 2012 Sep 19 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.017, 77° remarks: * orbital elements for (771) Libera : Mean anomaly = 309.71893956 deg Arg. of pericenter = 227.45941954 deg Long. of node = 218.23202418 deg Inclination = 14.94342283 deg Eccentricity = 0.24876510 Semimajor axis = 2.65026296 AU Perihelion dist = 1.99097003 AU Mag: H = 10.26, G = 0.15 Epoch of elements : MJD 56206.26800000 TDT (2012 Oct 06.268) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 6 771 Libera 6h 26.5m UT 11.5 0 7 9.068 14 22 45.79TYC 0600-00518-1 13.0 13.5 29 2.6 1.368 -1.879 -30.74 -110.1566 14.389 80.40 -5.29 6.4414 -0.38361 0.34094 -4.24622 -4.77936 0.00097 -0.00087 2000 308.2870832012 930.00000227.459420218.232024 14.9434230.24876510 2.6502630 1.990970010.5 5.00.15 RATE 2.2843920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.050 0.031 85 2.42 0.041 0 0 4-5 056197.0020121006_0518-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 22:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org