IOTA/IOTA-ES occultation update for (599) Luisa / 2UCAC 12083345 event on 2008 Jul 07, 12:56 UT Visible from New Zealand Summary ------- On 2008 Jul 07 UT, the 65 km diameter asteroid (599) Luisa will occult a 13.4 mag star in the constellation Ara for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.2 mag to 11.7 mag (the magnitude of the asteroid) for at most 8.1 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: 68 * date and approx. time of event: 2008 Jul 07, 12:43 - 2008 Jul 07, 13:08 UT * magnitude of target star: 13.4 * magnitude drop [mag]: 0.2 * estimated maximum duration [s]: 8.1 * Moon: 24 % sunlit, 99° distance * Sun: 150° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 65 * 1 sigma uncertainty interval [path widths]: +/- 0.86 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .067 +/- .060) * 1 sigma uncertainty ellipse (major, minor, PA): ( .068", .060", 97° ) * approx speed of asteroid's shadow [km/s]: 7.9853 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 12083345 by 599 Luisa on 2008 Jul 7 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 62 0 0 -28 53 28 13 8 50 27 130 -1 -28 30 31 -29 16 24 -27 51 2 -29 55 53 63 0 0 -29 37 9 13 8 43 28 130 -2 -29 14 22 -29 59 56 -28 35 9 -30 39 9 64 0 0 -30 19 49 13 8 35 29 129 -3 -29 57 11 -30 42 27 -29 18 15 -31 21 23 65 0 0 -31 1 27 13 8 28 31 129 -4 -30 38 58 -31 23 56 -30 0 18 -32 2 36 66 0 0 -31 42 5 13 8 20 32 128 -5 -31 19 45 -32 4 24 -30 41 21 -32 42 49 67 0 0 -32 21 42 13 8 12 33 128 -6 -31 59 32 -32 43 53 -31 21 23 -33 22 2 68 0 0 -33 0 20 13 8 4 34 127 -7 -32 38 18 -33 22 22 -32 0 25 -34 0 15 69 0 0 -33 37 59 13 7 56 35 127 -8 -33 16 6 -33 59 52 -32 38 29 -34 37 30 70 0 0 -34 14 40 13 7 48 36 126 -9 -33 52 56 -34 36 24 -33 15 34 -35 13 47 71 0 0 -34 50 24 13 7 40 37 125 -10 -34 28 49 -35 11 59 -33 51 41 -35 49 7 72 0 0 -35 25 11 13 7 31 38 125 -11 -35 3 44 -35 46 37 -34 26 51 -36 23 30 73 0 0 -35 59 2 13 7 23 39 124 -12 -35 37 44 -36 20 20 -35 1 6 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223 -39 - 3 3 49 - 3 55 29 - 2 19 22 - 4 39 54 -140 0 0 - 2 25 2 12 44 6 14 223 -38 - 1 59 10 - 2 50 54 - 1 14 39 - 3 35 22 -139 0 0 - 1 20 12 12 44 1 12 223 -36 - 0 54 19 - 1 46 6 - 0 9 45 - 2 30 38 -138 0 0 - 0 15 14 12 43 57 11 223 -35 0 10 41 - 0 41 9 0 55 16 - 1 25 43 -137 0 0 0 49 48 12 43 53 10 223 -34 1 15 44 0 23 53 2 0 21 - 0 20 42 -136 0 0 1 54 52 12 43 50 8 223 -32 2 20 48 1 28 56 3 5 25 0 44 21 -135 0 0 2 59 52 12 43 48 7 223 -31 3 25 48 2 33 57 4 10 24 1 49 23 -134 0 0 4 4 46 12 43 45 5 223 -30 4 30 40 3 38 52 5 15 15 2 54 19 -133 0 0 5 9 29 12 43 44 4 223 -28 5 35 22 4 43 36 6 19 54 3 59 6 -132 0 0 6 13 57 12 43 43 2 223 -27 6 39 47 5 48 6 7 24 16 5 3 39 -131 0 0 7 18 6 12 43 42 1 223 -25 7 43 54 6 52 18 .. .. .. 6 7 56 Uncertainty in time = +/- 8 secs [Prediction of 2008 Jul 3.0] Data for the target star ------------------------ * name: 2UCAC 12083345 * constellation : Ara * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 37 29.6335 DE: -46 15 24.467 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .056, .056 ) * V mag [mag]: 13.4 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (599) Luisa approx. diameter [km]: 65 approx. diameter ["]: .070 distance from Earth [AU]: 1.28000 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 876 number of rejected observations: 57 time covered by the observations: 1906 Apr 29 - 2008 Jun 16 1 sigma uncertainty ellipse (major, minor, PA): 0.039, 0.021, 110° remarks: * orbital elements for (599) Luisa : Mean anomaly = 325.07529127 deg Arg. of pericenter = 292.81022983 deg Long. of node = 44.67776244 deg Inclination = 16.66393180 deg Eccentricity = 0.29379504 Semimajor axis = 2.77254316 AU Perihelion dist = 1.95798374 AU Mag: H = 8.79, G = 0.15 Epoch of elements : MJD 54654.53900000 TDT (2008 Jul 07.539) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 7 599 Luisa 12h 57.0m UT 13.4 17 37 29.634-46 15 24.472UCAC 12083345 0.0 11.7 65 8.1 1.280 -2.911 -6.75 144.2544 -46.255 -13.00 22.51 12.9502 0.00491 -0.02219 -4.39808 -0.98540 0.00190 0.00185 2000 324.1062402008 7 3.00000292.810230 44.677762 16.6639320.29379504 2.7725432 1.9579837 8.7 5.00.15 RATE 2.1349440 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.068 0.060 97 1.86 0.060 0 54650.5020080707_083345 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 03, 00:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org