IOTA/IOTA-ES occultation update for (3419) Guth / TYC 0644-00139-1 event on 2012 Nov 19, 11:39 UT Visible from Mexico, Japan, China Summary ------- On 2012 Nov 19 UT, the 35 km diameter asteroid (3419) Guth will occult a 10.7 mag star in the constellation Aries for observers along a path across Mexico, Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.0 mag to 15.7 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: 24 * date and approx. time of event: 2012 Nov 19, 11:33 - 2012 Nov 19, 11:46 UT * geocentric midpoint of event [JD]: 2456250.98603333 * magnitude of target star: 10.7 * magnitude drop [mag]: 5.0 * estimated maximum duration [s]: 2.3 * Moon: 39 % sunlit, 91° distance * Sun: 167° distance * rough path description: Mexico, Japan, China The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 2.76 * 1 sigma uncertainty interval [seconds]: +/- 6.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .054) * 1 sigma uncertainty ellipse (major, minor, PA): ( .064", .051", 61° ) * approx speed of asteroid's shadow [km/s]: 15.0437 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0644-00139-1 by 3419 Guth on 2012 Nov 19 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 80 0 0 27 10 55 11 46 22 7 79 -1 27 21 26 27 0 23 28 19 49 26 2 34 81 0 0 27 23 27 11 46 21 7 80 -1 27 33 58 27 12 56 28 32 20 26 15 7 82 0 0 27 35 52 11 46 20 8 80 -2 27 46 24 27 25 22 28 44 45 26 27 35 83 0 0 27 48 12 11 46 19 9 81 -3 27 58 43 27 37 41 28 57 2 26 39 55 84 0 0 28 0 24 11 46 18 10 81 -4 28 10 55 27 49 54 29 9 13 26 52 9 85 0 0 28 12 29 11 46 16 11 82 -5 28 23 0 28 1 59 29 21 17 27 4 16 86 0 0 28 24 28 11 46 15 12 82 -6 28 34 58 28 13 58 29 33 14 27 16 16 87 0 0 28 36 18 11 46 13 13 83 -7 28 46 49 28 25 49 29 45 3 27 28 8 88 0 0 28 48 2 11 46 12 14 83 -8 28 58 32 28 37 33 29 56 44 27 39 53 89 0 0 28 59 38 11 46 10 15 84 -9 29 10 7 28 49 9 30 8 18 27 51 31 90 0 0 29 11 5 11 46 8 15 84 -9 29 21 35 29 0 37 30 19 44 28 3 0 91 0 0 29 22 25 11 46 6 16 85 -10 29 32 54 29 11 57 30 31 2 28 14 22 92 0 0 29 33 37 11 46 4 17 85 -11 29 44 6 29 23 9 30 42 12 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Uncertainty in time = +/- 7 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 0644-00139-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 56 51.5938 DE: +12 14 58.644 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .024, .039 ) * V mag [mag]: 10.7 * B mag [mag]: 11.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3419) Guth approx. diameter [km]: 35 approx. diameter ["]: .020 distance from Earth [AU]: 2.36500 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 923 number of rejected observations: 8 time covered by the observations: 1932 Dec 23 - 2012 Nov 13 1 sigma uncertainty ellipse (major, minor, PA): 0.060, 0.034, 56° remarks: * orbital elements for (3419) Guth : Mean anomaly = 123.84972556 deg Arg. of pericenter = 220.04475826 deg Long. of node = 58.78492539 deg Inclination = 17.55741101 deg Eccentricity = 0.06332361 Semimajor axis = 3.21379789 AU Perihelion dist = 3.01028859 AU Mag: H = 10.94, G = 0.15 Epoch of elements : MJD 56250.48600000 TDT (2012 Nov 19.486) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 19 3419 Guth 11h 39.9m UT 10.7 2 56 51.594 12 14 58.64TYC 0644-00139-1 11.3 15.7 35 2.3 2.365 -2.150 1.99 170.3357 12.249 1.41 -19.61 11.6648 0.02454 0.38235 -8.47427 0.53408 0.00110 0.00079 2000 123.76658620121119.00000220.044758 58.784925 17.5574110.06332361 3.2137979 3.010288610.9 5.00.15 RATE 1.7107090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.064 0.051 61 3.76 0.056 0 0-2 4 056247.0020121119_0139-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org