IOTA/IOTA-ES occultation update for (2613) Plzen / HIP 34418 event on 2012 Dec 18, 05:35 UT Visible from Africa, Venezuela, Colombia Summary ------- On 2012 Dec 18 UT, the 27 km diameter asteroid (2613) Plzen will occult a 8.3 mag star in the constellation Gemini for observers along a path across Africa, Venezuela, Colombia. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.2 mag to 15.5 mag (the magnitude of the asteroid) for at most 2.2 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: . The event at a glimpse ---------------------- * Rank: 22 * date and approx. time of event: 2012 Dec 18, 05:27 - 2012 Dec 18, 05:43 UT * geocentric midpoint of event [JD]: 2456279.73274583 * magnitude of target star: 8.3 * magnitude drop [mag]: 7.2 * estimated maximum duration [s]: 2.2 * Moon: 29 % sunlit, 134° distance * Sun: 161° distance * rough path description: Africa, Venezuela, Colombia The occultation path -------------------- * approximate projected width [km]: 28 * 1 sigma uncertainty interval [path widths]: +/- 3.07 * 1 sigma uncertainty interval [seconds]: +/- 8.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .081 +/- .051) * 1 sigma uncertainty ellipse (major, minor, PA): ( .084", .046", 109° ) * approx speed of asteroid's shadow [km/s]: 12.0139 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 34418 by 2613 Plzen on 2012 Dec 18 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 -145 0 0 -23 49 12 5 43 47 1 66 -16 -23 40 57 -23 57 27 .. .. .. -24 48 14 -144 0 0 -23 24 16 5 43 47 2 65 -17 -23 16 0 -23 32 32 .. .. .. -24 23 22 -143 0 0 -22 59 4 5 43 46 3 65 -18 -22 50 48 -23 7 20 -22 0 9 -23 58 15 -142 0 0 -22 33 37 5 43 46 4 64 -19 -22 25 20 -22 41 54 -21 34 38 -23 32 52 -141 0 0 -22 7 56 5 43 45 5 64 -20 -21 59 39 -22 16 13 -21 8 52 -23 7 15 -140 0 0 -21 42 0 5 43 44 6 64 -21 -21 33 43 -21 50 18 -20 42 53 -22 41 23 -139 0 0 -21 15 52 5 43 43 7 63 -22 -21 7 34 -21 24 10 -20 16 41 -22 15 18 -138 0 0 -20 49 30 5 43 42 8 63 -23 -20 41 12 -20 57 49 -19 50 16 -21 49 0 -137 0 0 -20 22 57 5 43 40 9 63 -24 -20 14 38 -20 31 16 -19 23 40 -21 22 30 -136 0 0 -19 56 11 5 43 39 10 62 -25 -19 47 52 -20 4 31 -18 56 52 -20 55 47 -135 0 0 -19 29 15 5 43 37 11 62 -26 -19 20 55 -19 37 35 -18 29 53 -20 28 54 -134 0 0 -19 2 9 5 43 35 12 62 -27 -18 53 48 -19 10 29 -18 2 44 -20 1 50 -133 0 0 -18 34 52 5 43 33 13 61 -28 -18 26 32 -18 43 13 -17 35 26 -19 34 36 -132 0 0 -18 7 27 5 43 31 14 61 -29 -17 59 6 -18 15 48 -17 7 58 -19 7 12 -131 0 0 -17 39 54 5 43 28 15 61 -30 -17 31 33 -17 48 15 -16 40 23 -18 39 40 -130 0 0 -17 12 12 5 43 26 16 60 -31 -17 3 51 -17 20 34 -16 12 41 -18 12 0 -129 0 0 -16 44 24 5 43 23 17 60 -32 -16 36 3 -16 52 46 -15 44 51 -17 44 13 -128 0 0 -16 16 29 5 43 20 18 60 -33 -16 8 8 -16 24 51 -15 16 56 -17 16 19 -127 0 0 -15 48 29 5 43 16 19 59 -34 -15 40 8 -15 56 51 -14 48 55 -16 48 20 -126 0 0 -15 20 24 5 43 13 20 59 -35 -15 12 3 -15 28 46 -14 20 50 -16 20 15 -125 0 0 -14 52 15 5 43 10 21 59 -36 -14 43 53 -15 0 37 -13 52 40 -15 52 6 -124 0 0 -14 24 2 5 43 6 22 59 -37 -14 15 41 -14 32 24 -13 24 28 -15 23 53 -123 0 0 -13 55 47 5 43 2 23 58 -38 -13 47 26 -14 4 9 -12 56 13 -14 55 37 -122 0 0 -13 27 30 5 42 58 25 58 -39 -13 19 8 -13 35 51 -12 27 57 -14 27 19 -121 0 0 -12 59 11 5 42 53 26 58 -40 -12 50 50 -13 7 33 -11 59 39 -13 59 0 -120 0 0 -12 30 52 5 42 49 27 57 -41 -12 22 31 -12 39 13 -11 31 21 -13 30 39 -119 0 0 -12 2 33 5 42 44 28 57 -42 -11 54 12 -12 10 54 -11 3 3 -13 2 19 -118 0 0 -11 34 15 5 42 40 29 57 -43 -11 25 54 -11 42 36 -10 34 47 -12 33 59 -117 0 0 -11 5 59 5 42 35 30 57 -44 -10 57 38 -11 14 19 -10 6 33 -12 5 41 -116 0 0 -10 37 45 5 42 29 31 56 -45 -10 29 25 -10 46 5 - 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12 0 0 11 43 21 5 28 46 41 289 -22 11 50 56 11 35 47 12 37 20 10 49 11 - 11 0 0 11 35 19 5 28 40 40 289 -21 11 42 54 11 27 44 12 29 21 10 41 6 - 10 0 0 11 26 52 5 28 34 39 289 -20 11 34 27 11 19 16 12 20 57 10 32 34 - 9 0 0 11 17 58 5 28 28 38 289 -19 11 25 34 11 10 22 12 12 7 10 23 37 - 8 0 0 11 8 39 5 28 23 37 289 -18 11 16 15 11 1 2 12 2 52 10 14 14 - 7 0 0 10 58 54 5 28 17 36 289 -17 11 6 31 10 51 17 11 53 10 10 4 25 - 6 0 0 10 48 43 5 28 12 35 289 -16 10 56 20 10 41 5 11 43 4 9 54 10 - 5 0 0 10 38 6 5 28 7 34 289 -15 10 45 44 10 30 28 11 32 31 9 43 29 - 4 0 0 10 27 4 5 28 1 33 289 -14 10 34 42 10 19 25 11 21 33 9 32 22 - 3 0 0 10 15 36 5 27 56 32 290 -13 10 23 15 10 7 56 11 10 10 9 20 49 - 2 0 0 10 3 42 5 27 51 31 290 -12 10 11 22 9 56 1 10 58 20 9 8 50 - 1 0 0 9 51 22 5 27 47 30 290 -11 9 59 3 9 43 41 10 46 6 8 56 26 0 0 0 9 38 37 5 27 42 30 290 -10 9 46 18 9 30 55 10 33 25 8 43 35 1 0 0 9 25 26 5 27 37 29 290 -9 9 33 8 9 17 43 10 20 19 8 30 19 2 0 0 9 11 49 5 27 33 28 290 -8 9 19 32 9 4 6 10 6 48 8 16 37 3 0 0 8 57 47 5 27 29 27 290 -7 9 5 31 8 50 3 9 52 51 8 2 30 4 0 0 8 43 20 5 27 24 26 290 -6 8 51 4 8 35 35 9 38 29 7 47 57 5 0 0 8 28 27 5 27 20 25 290 -5 8 36 12 8 20 41 9 23 42 7 32 58 6 0 0 8 13 8 5 27 16 24 290 -4 8 20 54 8 5 22 9 8 30 7 17 34 7 0 0 7 57 25 5 27 13 23 290 -3 8 5 12 7 49 38 8 52 52 7 1 45 8 0 0 7 41 16 5 27 9 22 291 -2 7 49 4 7 33 28 8 36 49 6 45 30 9 0 0 7 24 43 5 27 6 21 291 -1 7 32 31 7 16 54 8 20 22 6 28 50 10 0 0 7 7 44 5 27 2 20 291 0 7 15 33 6 59 54 8 3 29 6 11 45 Uncertainty in time = +/- 10 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: HIP 34418 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 08 08.0453 DE: +21 54 46.249 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .023, .013 ) * V mag [mag]: 8.3 * B mag [mag]: 8.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2613) Plzen approx. diameter [km]: 27 approx. diameter ["]: .019 distance from Earth [AU]: 1.95300 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 930 number of rejected observations: 21 time covered by the observations: 1979 Aug 30 - 2012 Nov 13 1 sigma uncertainty ellipse (major, minor, PA): 0.081, 0.044, 110° remarks: * orbital elements for (2613) Plzen : Mean anomaly = 350.96040950 deg Arg. of pericenter = 191.73731635 deg Long. of node = 277.60234839 deg Inclination = 13.01738539 deg Eccentricity = 0.04716977 Semimajor axis = 3.04159844 AU Perihelion dist = 2.89812693 AU Mag: H = 11.38, G = 0.15 Epoch of elements : MJD 56279.23300000 TDT (2012 Dec 18.233) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 18 2613 Plzen 5h 35.2m UT 8.3 7 8 8.045 21 54 46.25HIP 34418 8.5 15.5 27 2.2 1.953 -2.136 -7.03 -63.9961 21.915 95.39 -23.39 5.5859 0.04994 -0.21273 -6.59858 -1.56221 -0.00193 0.00028 2000 349.244896201212 9.00000191.737316277.602348 13.0173850.04716977 3.0415984 2.898126911.2 5.00.15 RATE 1.8580230 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.084 0.046 109 4.07 0.059 0 0 3-1 056264.0020121218__34418 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 10:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org