IOTA/IOTA-ES occultation update for (929) Algunde / HIP 16416 event on 2012 Dec 06, 07:54 UT Visible from Brazil, Peru Summary ------- On 2012 Dec 06 UT, the 11 km diameter asteroid (929) Algunde will occult a 8.2 mag star in the constellation Taurus for observers along a path across Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.9 mag to 15.1 mag (the magnitude of the asteroid) for at most 1.0 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: . The event at a glimpse ---------------------- * Rank: 24 * date and approx. time of event: 2012 Dec 06, 07:46 - 2012 Dec 06, 08:02 UT * geocentric midpoint of event [JD]: 2456267.82997083 * magnitude of target star: 8.2 * magnitude drop [mag]: 6.9 * estimated maximum duration [s]: 1.0 * Moon: 54 % sunlit, 105° distance * Sun: 160° distance * rough path description: Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 2.86 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .028", 85° ) * approx speed of asteroid's shadow [km/s]: 10.7846 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 16416 by 929 Algunde on 2012 Dec 6 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 169 0 0 -41 28 9 8 2 54 16 47 0 -41 23 56 -41 32 23 -40 59 50 -41 56 39 170 0 0 -41 0 29 8 2 51 17 47 -1 -40 56 16 -41 4 43 -40 32 10 -41 29 0 171 0 0 -40 32 35 8 2 48 18 46 -2 -40 28 22 -40 36 49 -40 4 15 -41 1 7 172 0 0 -40 4 28 8 2 44 19 45 -3 -40 0 14 -40 8 42 -39 36 6 -40 33 0 173 0 0 -39 36 7 8 2 40 20 44 -4 -39 31 53 -39 40 21 -39 7 45 -40 4 39 174 0 0 -39 7 33 8 2 37 20 44 -5 -39 3 20 -39 11 48 -38 39 12 -39 36 6 175 0 0 -38 38 49 8 2 33 21 43 -6 -38 34 35 -38 43 3 -38 10 27 -39 7 21 176 0 0 -38 9 53 8 2 29 22 42 -7 -38 5 39 -38 14 7 -37 41 32 -38 38 26 177 0 0 -37 40 47 8 2 24 23 42 -8 -37 36 34 -37 45 1 -37 12 27 -38 9 19 178 0 0 -37 11 32 8 2 20 24 41 -8 -37 7 19 -37 15 46 -36 43 12 -37 40 4 179 0 0 -36 42 9 8 2 15 25 40 -9 -36 37 55 -36 46 23 -36 13 50 -37 10 39 180 0 0 -36 12 38 8 2 10 26 40 -10 -36 8 25 -36 16 52 -35 44 20 -36 41 7 -179 0 0 -35 43 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47 - 60 0 0 -11 46 40 7 47 3 6 290 -23 -11 42 56 -11 50 25 -11 21 35 -12 11 53 - 59 0 0 -12 3 14 7 47 1 5 290 -22 -11 59 29 -12 6 59 -11 38 5 -12 28 30 - 58 0 0 -12 20 18 7 47 0 4 289 -21 -12 16 32 -12 24 3 -11 55 5 -12 45 38 - 57 0 0 -12 37 53 7 46 59 3 289 -20 -12 34 6 -12 41 39 .. .. .. -13 3 17 - 56 0 0 -12 55 58 7 46 59 2 289 -19 -12 52 11 -12 59 45 .. .. .. -13 21 27 - 55 0 0 -13 14 34 7 46 58 1 289 -18 -13 10 47 -13 18 22 .. .. .. -13 40 7 - 54 0 0 -13 33 41 7 46 58 0 288 -17 -13 29 52 -13 37 29 .. .. .. -13 59 18 Uncertainty in time = +/- 4 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: HIP 16416 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 31 24.4707 DE: +17 48 40.566 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .031, .022 ) * V mag [mag]: 8.2 * B mag [mag]: 9.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (929) Algunde approx. diameter [km]: 11 approx. diameter ["]: .010 distance from Earth [AU]: 1.53600 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1190 number of rejected observations: 70 time covered by the observations: 1920 Mar 10 - 2012 Nov 20 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.017, 80° remarks: * orbital elements for (929) Algunde : Mean anomaly = 165.68424653 deg Arg. of pericenter = 22.60099170 deg Long. of node = 231.44219106 deg Inclination = 3.91303683 deg Eccentricity = 0.11277280 Semimajor axis = 2.23989528 AU Perihelion dist = 1.98729602 AU Mag: H = 11.62, G = 0.15 Epoch of elements : MJD 56267.33000000 TDT (2012 Dec 06.330) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 6 929 Algunde 7h 55.2m UT 8.2 3 31 24.471 17 48 40.57HIP 16416 9.5 15.1 11 1.0 1.536 -2.302 -11.53 -141.4467 17.814 59.00 -22.55 7.9193 0.18496 -0.52166 -5.74402 -2.01483 0.00183 0.00058 2000 163.52915220121129.00000 22.600992231.442191 3.9130370.11277280 2.2398953 1.987296011.6 5.00.15 RATE 2.9401020 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.028 85 3.86 0.028 0 0-3-4 056264.0020121206__16416 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 22:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org