IOTA/IOTA-ES occultation update for (1434) Margot / TYC 0080-00381-1 event on 2012 Dec 05, 13:15 UT Visible from Taiwan, S China, India Summary ------- On 2012 Dec 05 UT, the 31 km diameter asteroid (1434) Margot will occult a 9.9 mag star in the constellation Taurus for observers along a path across Taiwan, S China, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 15.1 mag (the magnitude of the asteroid) for at most 2.3 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: 41 * date and approx. time of event: 2012 Dec 05, 13:07 - 2012 Dec 05, 13:22 UT * geocentric midpoint of event [JD]: 2456267.05223333 * magnitude of target star: 9.9 * magnitude drop [mag]: 5.2 * estimated maximum duration [s]: 2.3 * Moon: 62 % sunlit, 84° distance * Sun: 162° distance * rough path description: Taiwan, S China, India The occultation path -------------------- * approximate projected width [km]: 33 * 1 sigma uncertainty interval [path widths]: +/- 1.61 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .032", 84° ) * approx speed of asteroid's shadow [km/s]: 13.3122 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0080-00381-1 by 1434 Margot on 2012 Dec 5 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 61 0 0 16 2 18 13 22 44 3 85 -1 16 11 16 15 53 21 16 40 10 15 24 35 62 0 0 16 8 31 13 22 44 4 85 -2 16 17 28 15 59 34 16 46 22 15 30 47 63 0 0 16 14 46 13 22 43 5 85 -3 16 23 44 16 5 49 16 52 39 15 37 3 64 0 0 16 21 6 13 22 42 6 86 -3 16 30 3 16 12 8 16 58 58 15 43 22 65 0 0 16 27 28 13 22 41 7 86 -4 16 36 26 16 18 31 17 5 20 15 49 44 66 0 0 16 33 53 13 22 40 8 86 -5 16 42 51 16 24 56 17 11 46 15 56 9 67 0 0 16 40 22 13 22 39 9 87 -6 16 49 20 16 31 25 17 18 15 16 2 38 68 0 0 16 46 53 13 22 38 10 87 -7 16 55 51 16 37 56 17 24 46 16 9 9 69 0 0 16 53 27 13 22 36 11 87 -8 17 2 25 16 44 30 17 31 20 16 15 43 70 0 0 17 0 4 13 22 35 11 88 -9 17 9 2 16 51 6 17 37 57 16 22 19 71 0 0 17 6 43 13 22 33 12 88 -10 17 15 41 16 57 45 17 44 36 16 28 58 72 0 0 17 13 24 13 22 31 13 88 -11 17 22 22 17 4 27 17 51 18 16 35 39 73 0 0 17 20 8 13 22 29 14 88 -12 17 29 6 17 11 10 17 58 2 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48 55 -117 0 0 23 20 52 13 7 42 3 275 -15 23 29 49 23 11 55 23 58 42 22 43 10 -116 0 0 23 15 2 13 7 41 2 275 -14 23 23 59 23 6 6 23 52 53 22 37 21 -115 0 0 23 9 9 13 7 41 1 276 -14 23 18 6 23 0 12 23 46 59 .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 0080-00381-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 19 36.4914 DE: +05 37 59.013 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .026 ) * V mag [mag]: 9.9 * B mag [mag]: 10.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1434) Margot approx. diameter [km]: 31 approx. diameter ["]: .020 distance from Earth [AU]: 2.18000 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1147 number of rejected observations: 63 time covered by the observations: 1906 Aug 28 - 2012 Oct 02 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.019, 80° remarks: * orbital elements for (1434) Margot : Mean anomaly = 122.31157360 deg Arg. of pericenter = 146.33071084 deg Long. of node = 152.62836694 deg Inclination = 10.80403996 deg Eccentricity = 0.06174606 Semimajor axis = 3.02388981 AU Perihelion dist = 2.83717654 AU Mag: H = 10.23, G = 0.15 Epoch of elements : MJD 56266.55200000 TDT (2012 Dec 05.552) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 5 1434 Margot 13h 15.2m UT 9.9 4 19 36.491 5 37 59.01TYC 0080-00381-1 10.3 15.1 31 2.3 2.180 -2.026 -1.93 151.3560 5.634 -21.10 -22.46 13.2536 -0.02116 0.33108 -7.49845 -0.48008 0.00068 0.00174 2000 121.08348720121129.00000146.330711152.628367 10.8040400.06174606 3.0238898 2.837176510.4 5.00.15 RATE 1.8743690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.032 84 2.61 0.031 0 0 4 3 056264.0020121205_0381-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 21:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org