IOTA/IOTA-ES occultation update for (2768) Gorky / TYC 6390-00108-1 event on 2012 Oct 07, 23:52 UT Visible from SE USA, S Africa Summary ------- On 2012 Oct 07 UT, the 13 km diameter asteroid (2768) Gorky will occult a 9.5 mag star in the constellation Aquarius for observers along a path across SE USA, S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 14.4 mag (the magnitude of the asteroid) for at most 3.5 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: 22 * date and approx. time of event: 2012 Oct 07, 23:25 - 2012 Oct 08, 00:19 UT * geocentric midpoint of event [JD]: 2456208.49479167 * magnitude of target star: 9.5 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 3.5 * Moon: 52 % sunlit, 123° distance * Sun: 142° distance * rough path description: SE USA, S Africa The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 3.04 * 1 sigma uncertainty interval [seconds]: +/- 9.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .059 +/- .047) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .046", 72° ) * approx speed of asteroid's shadow [km/s]: 3.7828 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6390-00108-1 by 2768 Gorky on 2012 Oct 7 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 -104 0 0 45 51 58 24 19 19 3 120 0 45 56 12 45 47 44 46 21 59 45 22 3 -103 0 0 45 28 49 24 19 17 4 120 -1 45 33 4 45 24 34 45 58 58 44 58 46 -102 0 0 45 5 5 24 19 15 5 121 -1 45 9 21 45 0 49 45 35 22 44 34 54 -101 0 0 44 40 46 24 19 13 6 122 -2 44 45 4 44 36 29 45 11 11 44 10 27 -100 0 0 44 15 53 24 19 10 6 122 -3 44 20 12 44 11 35 44 46 26 43 45 26 - 99 0 0 43 50 25 24 19 7 7 123 -3 43 54 45 43 46 6 44 21 6 43 19 50 - 98 0 0 43 24 22 24 19 4 8 124 -4 43 28 43 43 20 2 43 55 11 42 53 40 - 97 0 0 42 57 45 24 19 0 9 125 -5 43 2 7 42 53 23 43 28 42 42 26 54 - 96 0 0 42 30 32 24 18 56 10 125 -5 42 34 55 42 26 9 43 1 37 41 59 34 - 95 0 0 42 2 45 24 18 51 11 126 -6 42 7 9 41 58 21 42 33 57 41 31 39 - 94 0 0 41 34 23 24 18 46 12 127 -7 41 38 48 41 29 58 42 5 43 41 3 10 - 93 0 0 41 5 26 24 18 41 12 127 -7 41 9 53 41 1 0 41 36 53 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Uncertainty in time = +/- 12 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 6390-00108-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 53 17.9564 DE: -17 51 57.605 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .026 ) * V mag [mag]: 9.5 * B mag [mag]: 10.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2768) Gorky approx. diameter [km]: 13 approx. diameter ["]: .018 distance from Earth [AU]: 1.00500 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1065 number of rejected observations: 21 time covered by the observations: 1934 Apr 06 - 2012 Sep 15 1 sigma uncertainty ellipse (major, minor, PA): 0.055, 0.038, 68° remarks: * orbital elements for (2768) Gorky : Mean anomaly = 337.33505924 deg Arg. of pericenter = 334.96930709 deg Long. of node = 53.32196365 deg Inclination = 6.27926539 deg Eccentricity = 0.17106768 Semimajor axis = 2.23400209 AU Perihelion dist = 1.85183652 AU Mag: H = 12.10, G = 0.15 Epoch of elements : MJD 56207.99500000 TDT (2012 Oct 07.995) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 7 2768 Gorky 23h 52.5m UT 9.5 22 53 17.956-17 51 57.61TYC 6390-00108-1 10.1 14.4 13 3.5 1.005 -1.089 10.32 -31.8250 -17.868 178.77 -5.95 23.8750 0.15978 0.24114 -1.78068 1.17808 0.00257 0.00185 2000 334.9751402012 930.00000334.969307 53.321964 6.2792650.17106768 2.2340021 1.851836512.0 5.00.15 RATE 2.9517440 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.046 72 4.04 0.054 0 0 4 5 056197.0020121007_0108-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 22:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org