IOTA/IOTA-ES occultation update for (146) Lucina / UCAC2 39290583 event on 2007 Oct 02, 18:44 UT Visible from Australia Summary ------- On 2007 Oct 02 UT, the 132 km diameter asteroid (146) Lucina will occult a 11.9 mag star in the constellation Gemini for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 13.7 mag (the magnitude of the asteroid) for at most 9.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2007 Oct 02, 18:38 - 2007 Oct 02, 18:50 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 9.0 * Moon: 56 % sunlit, 9° distance * Sun: 92° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 161 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .019) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .019", 88° ) * approx speed of asteroid's shadow [km/s]: 14.6610 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 39290583 by 146 Lucina on 2007 Oct 02 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 97 0 0 -40 20 36 18 38 15 0 61 -43 .. .. .. -39 31 29 .. .. .. .. .. .. 98 0 0 -39 55 24 18 38 16 1 61 -43 -40 45 6 -39 6 15 -41 13 11 .. .. .. 99 0 0 -39 29 59 18 38 16 2 60 -43 -40 19 42 -38 40 50 -40 47 48 .. .. .. 100 0 0 -39 4 24 18 38 16 3 59 -43 -39 54 7 -38 15 14 -40 22 14 .. .. .. 101 0 0 -38 38 38 18 38 17 4 59 -43 -39 28 22 -37 49 27 -39 56 28 -37 22 9 102 0 0 -38 12 41 18 38 17 5 58 -43 -39 2 26 -37 23 31 -39 30 32 -36 56 12 103 0 0 -37 46 36 18 38 18 6 57 -43 -38 36 20 -36 57 25 -39 4 27 -36 30 7 104 0 0 -37 20 21 18 38 19 6 57 -42 -38 10 5 -36 31 11 -38 38 12 -36 3 53 105 0 0 -36 53 59 18 38 20 7 56 -42 -37 43 42 -36 4 49 -38 11 48 -35 37 31 106 0 0 -36 27 29 18 38 21 8 56 -42 -37 17 12 -35 38 20 -37 45 17 -35 11 2 107 0 0 -36 0 52 18 38 22 9 55 -42 -36 50 34 -35 11 44 -37 18 39 -34 44 27 108 0 0 -35 34 10 18 38 24 10 54 -42 -36 23 50 -34 45 3 -36 51 54 -34 17 47 109 0 0 -35 7 22 18 38 25 11 54 -41 -35 57 1 -34 18 17 -36 25 4 -33 51 1 110 0 0 -34 40 30 18 38 27 12 53 -41 -35 30 7 -33 51 26 -35 58 9 -33 24 12 111 0 0 -34 13 34 18 38 29 13 53 -41 -35 3 9 -33 24 32 -35 31 10 -32 57 19 112 0 0 -33 46 35 18 38 31 14 52 -41 -34 36 7 -32 57 36 -35 4 7 -32 30 24 113 0 0 -33 19 34 18 38 33 15 51 -40 -34 9 4 -32 30 37 -34 37 2 -32 3 26 114 0 0 -32 52 31 18 38 35 16 51 -40 -33 41 58 -32 3 37 -34 9 55 -31 36 28 115 0 0 -32 25 28 18 38 38 17 50 -40 -33 14 52 -31 36 37 -33 42 47 -31 9 29 116 0 0 -31 58 26 18 38 41 18 50 -39 -32 47 46 -31 9 37 -33 15 39 -30 42 31 117 0 0 -31 31 24 18 38 43 19 49 -39 -32 20 41 -30 42 39 -32 48 32 -30 15 35 118 0 0 -31 4 24 18 38 46 20 48 -38 -31 53 37 -30 15 43 -32 21 26 -29 48 40 119 0 0 -30 37 27 18 38 49 20 48 -38 -31 26 36 -29 48 49 -31 54 23 -29 21 49 120 0 0 -30 10 33 18 38 53 21 47 -37 -30 59 38 -29 21 59 -31 27 22 -28 55 1 121 0 0 -29 43 43 18 38 56 22 47 -37 -30 32 45 -28 55 14 -31 0 26 -28 28 18 122 0 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67 -23 44 5 -22 9 56 -24 10 47 .. .. .. -118 0 0 -23 20 8 18 50 7 2 294 67 -24 7 33 -22 33 12 -24 34 19 .. .. .. -117 0 0 -23 43 46 18 50 8 1 294 67 -24 31 16 -22 56 44 -24 58 6 .. .. .. -116 0 0 -24 7 39 18 50 8 0 294 67 .. .. .. .. .. .. .. .. .. .. .. .. Data for the target star ------------------------ * name: UCAC2 39290583 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 31 19.2213 DE: +21 25 12.929 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .017 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (146) Lucina approx. diameter [km]: 132 approx. diameter ["]: .068 distance from Earth [AU]: 2.66000 * orbital information: orbit source: Preston date of fit: 2007 Sep 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 703 number of rejected observations: 82 time covered by the observations: 1906 Apr 28 - 2007 Sep 19 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.008, 78° remarks: * orbital elements for (146) Lucina : Mean anomaly = 212.65332032 deg Arg. of pericenter = 143.61135512 deg Long. of node = 84.17535614 deg Inclination = 13.07467760 deg Eccentricity = 0.06470075 Semimajor axis = 2.71950026 AU Perihelion dist = 2.54354656 AU Mag: H = 8.18, G = 0.11 Epoch of elements : MJD 54375.78100000 TDT (2007 Oct 02.781) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 02 146 Lucina 18h 44.2m UT 11.9 6 31 19.221 21 25 12.93UCAC2 39290583 0.0 13.7 132 9.0 2.660 1.935 4.27 -194.323 21.419 -103.70 -3.65 18.7366 .09043 -.56562 8.17355 1.29218 -0.00574 0.00031 2000 211.3828232007 927.00000143.611355 84.175356 13.0746780.064700752.719500262.543546568.205 0.11 RATE 2.1977100 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.029 0.019 87.9 1.280 0.019 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 25, 22:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org