IOTA/IOTA-ES occultation update for (564) Dudu / TYC 2471-01613-1 event on 2012 Dec 02, 20:04 UT Visible from Japan, Russia Summary ------- On 2012 Dec 02 UT, the 50 km diameter asteroid (564) Dudu will occult a 9.2 mag star in the constellation Lynx for observers along a path across Japan, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.8 mag to 16.0 mag (the magnitude of the asteroid) for at most 4.2 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: 58 * date and approx. time of event: 2012 Dec 02, 19:59 - 2012 Dec 02, 20:12 UT * geocentric midpoint of event [JD]: 2456264.33625833 * magnitude of target star: 9.2 * magnitude drop [mag]: 6.8 * estimated maximum duration [s]: 4.2 * Moon: 85 % sunlit, 18° distance * Sun: 135° distance * rough path description: Japan, Russia The occultation path -------------------- * approximate projected width [km]: 55 * 1 sigma uncertainty interval [path widths]: +/- 1.06 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .025", 89° ) * approx speed of asteroid's shadow [km/s]: 11.8702 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2471-01613-1 by 564 Dudu on 2012 Dec 2 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 152 0 0 13 43 32 19 59 0 45 304 -1 14 12 17 13 14 59 15 13 56 12 15 6 151 0 0 15 22 7 19 59 14 46 303 -3 15 51 22 14 53 5 16 54 6 13 52 12 150 0 0 17 2 7 19 59 28 48 302 -4 17 31 52 16 32 35 18 35 43 15 30 43 149 0 0 18 43 25 19 59 43 50 300 -6 19 13 40 18 13 24 20 18 39 17 10 31 148 0 0 20 25 52 19 59 58 51 299 -7 20 56 39 19 55 21 22 2 46 18 51 28 147 0 0 22 9 21 20 0 14 53 297 -8 22 40 39 21 38 20 23 47 54 20 33 26 146 0 0 23 53 42 20 0 30 54 295 -10 24 25 30 23 22 11 25 33 55 22 16 15 145 0 0 25 38 43 20 0 46 56 293 -11 26 11 3 25 6 42 27 20 37 23 59 46 144 0 0 27 24 15 20 1 3 57 290 -13 27 57 5 26 51 44 29 7 48 25 43 47 143 0 0 29 10 5 20 1 20 59 288 -14 29 43 26 28 37 5 30 55 17 27 28 8 142 0 0 30 56 1 20 1 37 60 285 -15 31 29 52 30 22 32 32 42 50 29 12 37 141 0 0 32 41 50 20 1 54 61 282 -16 33 16 10 32 7 52 34 30 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18 6 26 -14 59 51 18 58 36 15 61 13 0 57 18 37 - 46 0 0 57 59 15 20 12 20 5 25 -13 58 37 26 57 21 33 60 0 4 56 3 5 - 47 0 0 56 41 20 20 12 21 3 24 -12 57 19 53 56 3 16 58 43 21 54 44 4 - 48 0 0 55 19 44 20 12 22 2 23 -11 55 58 36 54 41 21 57 22 47 53 21 32 - 49 0 0 53 54 28 20 12 22 0 22 -10 54 33 36 .. .. .. 55 58 22 .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 2471-01613-1 * constellation : Lynx * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 54 50.6654 DE: +33 38 59.109 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .020 ) * V mag [mag]: 9.2 * B mag [mag]: 10.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (564) Dudu approx. diameter [km]: 50 approx. diameter ["]: .025 distance from Earth [AU]: 2.73600 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 926 number of rejected observations: 28 time covered by the observations: 1914 Apr 21 - 2012 Nov 08 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.015, 88° remarks: * orbital elements for (564) Dudu : Mean anomaly = 177.31625677 deg Arg. of pericenter = 215.00866124 deg Long. of node = 70.78678881 deg Inclination = 17.99156685 deg Eccentricity = 0.27540555 Semimajor axis = 2.74864395 AU Perihelion dist = 1.99165214 AU Mag: H = 10.20, G = 0.15 Epoch of elements : MJD 56263.83600000 TDT (2012 Dec 02.836) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 2 564 Dudu 20h 4.2m UT 9.2 7 54 50.665 33 38 59.11TYC 2471-01613-1 10.0 16.0 50 4.2 2.736 -1.106 16.54 105.5928 33.645 -123.62 -22.10 20.0702 0.31331 0.26146 -4.29294 5.14379 -0.00427 -0.00012 2000 176.48658820121129.00000215.008661 70.786789 17.9915670.27540555 2.7486440 1.991652210.4 5.00.15 RATE 2.1628500 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.025 89 2.06 0.027 0 0 4-1 056247.0020121202_1613-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 09:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org