IOTA/IOTA-ES occultation update for (1604) Tombaugh / TYC 1180-01189-1 event on 2012 Nov 03, 18:27 UT Visible from Russia, SW Asia, Africa Summary ------- On 2012 Nov 03 UT, the 29 km diameter asteroid (1604) Tombaugh will occult a 11.2 mag star in the constellation Pisces for observers along a path across Russia, SW Asia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.6 mag to 14.7 mag (the magnitude of the asteroid) for at most 3.7 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: 38 * date and approx. time of event: 2012 Nov 03, 18:14 - 2012 Nov 03, 18:37 UT * geocentric midpoint of event [JD]: 2456235.26896667 * magnitude of target star: 11.2 * magnitude drop [mag]: 3.6 * estimated maximum duration [s]: 3.7 * Moon: 80 % sunlit, 84° distance * Sun: 148° distance * rough path description: Russia, SW Asia, Africa The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 1.75 * 1 sigma uncertainty interval [seconds]: +/- 7.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .044 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .035", 74° ) * approx speed of asteroid's shadow [km/s]: 7.7206 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1180-01189-1 by 1604 Tombaugh on 2012 Nov 3 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 - 13 0 0 2 26 34 18 37 18 33 71 -1 2 37 3 2 16 7 3 13 51 1 39 38 - 12 0 0 3 9 17 18 37 7 34 72 -2 3 19 49 2 58 46 3 56 50 2 22 5 - 11 0 0 3 52 41 18 36 57 35 72 -3 4 3 17 3 42 6 4 40 31 3 5 13 - 10 0 0 4 36 45 18 36 45 37 72 -4 4 47 25 4 26 7 5 24 51 3 49 1 - 9 0 0 5 21 29 18 36 34 38 73 -5 5 32 12 5 10 47 6 9 51 4 33 28 - 8 0 0 6 6 50 18 36 22 39 73 -7 6 17 37 5 56 4 6 55 29 5 18 33 - 7 0 0 6 52 48 18 36 10 40 74 -8 7 3 39 6 41 59 7 41 44 6 4 16 - 6 0 0 7 39 23 18 35 57 41 74 -9 7 50 17 7 28 30 8 28 35 6 50 34 - 5 0 0 8 26 31 18 35 44 42 75 -10 8 37 29 8 15 35 9 16 0 7 37 26 - 4 0 0 9 14 13 18 35 31 43 75 -11 9 25 14 9 3 13 10 3 58 8 24 52 - 3 0 0 10 2 27 18 35 18 44 76 -12 10 13 31 9 51 23 10 52 28 9 12 50 - 2 0 0 10 51 10 18 35 4 45 77 -13 11 2 19 10 40 3 11 41 28 10 1 18 - 1 0 0 11 40 23 18 34 50 47 78 -14 11 51 35 11 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Uncertainty in time = +/- 8 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 1180-01189-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 22 03.5617 DE: +16 51 10.640 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .028 ) * V mag [mag]: 11.2 * B mag [mag]: 11.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1604) Tombaugh approx. diameter [km]: 29 approx. diameter ["]: .021 distance from Earth [AU]: 1.88900 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1073 number of rejected observations: 50 time covered by the observations: 1920 Mar 10 - 2012 Oct 22 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.022, 60° remarks: * orbital elements for (1604) Tombaugh : Mean anomaly = 29.84991015 deg Arg. of pericenter = 37.16029129 deg Long. of node = 309.21519899 deg Inclination = 9.37932810 deg Eccentricity = 0.09680871 Semimajor axis = 3.02449875 AU Perihelion dist = 2.73170092 AU Mag: H = 10.36, G = 0.15 Epoch of elements : MJD 56234.76900000 TDT (2012 Nov 03.769) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 3 1604 Tombaugh 18h 27.3m UT 11.2 0 22 3.562 16 51 10.64TYC 1180-01189-1 11.8 14.7 29 3.7 1.889 -1.106 -12.61 45.2711 16.857 -100.93 -15.36 18.4552 -0.25971 0.32845 -3.41341 -2.70898 0.00309 0.00010 2000 28.95629320121030.00000 37.160291309.215199 9.3793280.09680871 3.0244988 2.731700910.4 5.00.15 RATE 1.8738030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.035 74 2.75 0.037 0 0-3 0 056226.0020121103_1189-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org