IOTA/IOTA-ES occultation update for (1819) Laputa / TYC 2512-00545-1 event on 2008 May 02, 09:49 UT Visible from Australia Summary ------- On 2008 May 02 UT, the 49 km diameter asteroid (1819) Laputa will occult a 10.9 mag star in the constellation Leo Minor 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 5.1 mag to 16.0 mag (the magnitude of the asteroid) for at most 10.1 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: 53 * date and approx. time of event: 2008 May 02, 09:53 - 2008 May 02, 10:07 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 5.1 * estimated maximum duration [s]: 10.1 * Moon: 14 % sunlit, 143° distance * Sun: 107° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 1.20 * 1 sigma uncertainty interval [seconds]: +/- 11.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .026", 87° ) * approx speed of asteroid's shadow [km/s]: 4.8527 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2512-00545-1 by 1819 Laputa on 2008 May 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 116 22 23 -55 0 0 10 7 24 1 27 -12 115 51 59 116 52 34 114 38 2 ... .. .. 117 12 28 -54 0 0 10 7 23 2 26 -12 116 43 10 117 41 33 115 31 59 118 50 34 117 58 30 -53 0 0 10 7 22 3 26 -13 117 30 13 118 26 36 116 21 32 119 33 19 118 40 54 -52 0 0 10 7 20 4 25 -13 118 13 32 119 8 6 117 7 7 120 12 43 119 20 0 -51 0 0 10 7 18 5 25 -13 118 53 28 119 46 23 117 49 8 120 49 5 119 56 8 -50 0 0 10 7 15 6 24 -13 119 30 22 120 21 45 118 27 56 121 22 40 120 29 32 -49 0 0 10 7 12 7 24 -14 120 4 29 120 54 27 119 3 47 121 53 44 121 0 27 -48 0 0 10 7 8 8 23 -14 120 36 3 121 24 43 119 36 58 122 22 30 121 29 5 -47 0 0 10 7 4 9 23 -14 121 5 17 121 52 45 120 7 42 122 49 7 121 55 36 -46 0 0 10 6 59 10 23 -14 121 32 23 122 18 43 120 36 10 123 13 47 122 20 11 -45 0 0 10 6 53 11 23 -14 121 57 29 122 42 47 121 2 34 123 36 38 122 42 58 -44 0 0 10 6 47 12 22 -14 122 20 45 123 5 5 121 27 2 123 57 47 123 4 4 -43 0 0 10 6 41 13 22 -14 122 42 18 123 25 44 121 49 42 124 17 22 123 23 36 -42 0 0 10 6 34 14 22 -15 123 2 16 123 44 51 122 10 43 124 35 29 123 41 41 -41 0 0 10 6 27 15 22 -15 123 20 45 124 2 32 122 30 10 124 52 14 123 58 23 -40 0 0 10 6 19 16 22 -15 123 37 50 124 18 52 122 48 10 125 7 42 124 13 49 -39 0 0 10 6 11 17 22 -15 123 53 36 124 33 56 123 4 48 125 21 57 124 28 1 -38 0 0 10 6 3 18 22 -15 124 8 9 124 47 50 123 20 9 125 35 4 124 41 5 -37 0 0 10 5 54 19 22 -15 124 21 32 125 0 35 123 34 17 125 47 6 124 53 5 -36 0 0 10 5 44 20 22 -15 124 33 48 125 12 17 123 47 16 125 58 7 125 4 2 -35 0 0 10 5 34 21 22 -15 124 45 2 125 22 58 123 59 10 126 8 10 125 14 1 -34 0 0 10 5 24 22 22 -15 124 55 17 125 32 42 124 10 2 126 17 17 125 23 5 -33 0 0 10 5 13 23 22 -14 125 4 35 125 41 31 124 19 55 126 25 32 125 31 14 -32 0 0 10 5 2 24 22 -14 125 12 58 125 49 27 124 28 52 126 32 56 125 38 33 -31 0 0 10 4 51 25 22 -14 125 20 30 125 56 33 124 36 55 126 39 32 125 45 3 -30 0 0 10 4 39 26 22 -14 125 27 11 126 2 51 124 44 6 126 45 21 125 50 45 -29 0 0 10 4 26 27 22 -14 125 33 5 126 8 22 124 50 27 126 50 26 125 55 42 -28 0 0 10 4 14 28 22 -14 125 38 13 126 13 9 124 56 1 126 54 47 125 59 55 -27 0 0 10 4 1 29 23 -14 125 42 36 126 17 12 125 0 48 126 58 26 126 3 25 -26 0 0 10 3 47 30 23 -14 125 46 15 126 20 32 125 4 50 127 1 25 126 6 14 -25 0 0 10 3 33 31 23 -13 125 49 12 126 23 12 125 8 8 127 3 45 126 8 22 -24 0 0 10 3 19 32 23 -13 125 51 29 126 25 13 125 10 44 127 5 26 126 9 51 -23 0 0 10 3 4 33 24 -13 125 53 5 126 26 34 125 12 39 127 6 29 126 10 41 -22 0 0 10 2 49 33 24 -13 125 54 2 126 27 17 125 13 53 127 6 56 126 10 53 -21 0 0 10 2 34 34 24 -12 125 54 21 126 27 23 125 14 27 127 6 46 126 10 28 -20 0 0 10 2 18 35 25 -12 125 54 2 126 26 52 125 14 22 127 6 1 126 9 26 -19 0 0 10 2 2 36 25 -12 125 53 5 126 25 45 125 13 39 127 4 41 126 7 48 -18 0 0 10 1 45 37 25 -12 125 51 32 126 24 1 125 12 17 127 2 46 126 5 33 -17 0 0 10 1 29 38 26 -11 125 49 22 126 21 42 125 10 18 127 0 17 126 2 43 -16 0 0 10 1 11 39 26 -11 125 46 36 126 18 48 125 7 41 126 57 13 125 59 17 -15 0 0 10 0 54 40 27 -10 125 43 13 126 15 19 125 4 27 126 53 35 125 55 16 -14 0 0 10 0 36 40 27 -10 125 39 15 126 11 14 125 0 36 126 49 23 125 50 39 -13 0 0 10 0 18 41 28 -10 125 34 40 126 6 34 124 56 8 126 44 37 125 45 26 -12 0 0 9 59 59 42 28 -9 125 29 29 126 1 19 124 51 2 126 39 17 125 39 37 -11 0 0 9 59 40 43 29 -9 125 23 42 125 55 29 124 45 19 126 33 22 125 33 12 -10 0 0 9 59 21 44 30 -9 125 17 18 125 49 2 124 38 58 126 26 53 125 26 10 - 9 0 0 9 59 2 44 30 -8 125 10 17 125 42 0 124 31 59 126 19 48 125 18 31 - 8 0 0 9 58 42 45 31 -8 125 2 39 125 34 21 124 24 22 126 12 8 125 10 15 - 7 0 0 9 58 22 46 32 -7 124 54 23 125 26 5 124 16 5 126 3 52 125 1 21 - 6 0 0 9 58 1 46 33 -7 124 45 28 125 17 11 124 7 9 125 54 59 124 51 48 - 5 0 0 9 57 41 47 33 -6 124 35 54 125 7 39 123 57 33 125 45 29 124 41 35 - 4 0 0 9 57 20 48 34 -6 124 25 40 124 57 28 123 47 15 125 35 21 124 30 42 - 3 0 0 9 56 58 49 35 -5 124 14 45 124 46 36 123 36 15 125 24 34 124 19 8 - 2 0 0 9 56 37 49 36 -5 124 3 8 124 35 4 123 24 32 125 13 7 124 6 51 - 1 0 0 9 56 15 50 37 -4 123 50 48 124 22 50 123 12 5 125 1 0 123 53 50 0 0 0 9 55 53 50 38 -3 123 37 44 124 9 52 122 58 53 124 48 10 123 40 4 1 0 0 9 55 30 51 39 -3 123 23 54 123 56 11 122 44 53 124 34 37 123 25 32 2 0 0 9 55 8 52 40 -2 123 9 18 123 41 43 122 30 5 124 20 20 123 10 12 3 0 0 9 54 45 52 41 -2 122 53 52 123 26 28 122 14 28 124 5 16 122 54 2 4 0 0 9 54 21 53 43 -1 122 37 37 123 10 23 121 57 58 123 49 24 122 37 0 5 0 0 9 53 58 53 44 0 122 20 29 122 53 28 121 40 36 123 32 43 Uncertainty in time = +/- 12 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: TYC 2512-00545-1 * constellation : Leo Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 41 47.1274 DE: +30 10 59.507 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .018 ) * V mag [mag]: 10.9 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1819) Laputa approx. diameter [km]: 49 approx. diameter ["]: .023 distance from Earth [AU]: 2.90900 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 709 number of rejected observations: 31 time covered by the observations: 1948 Aug 09 - 2008 Apr 12 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.019, 86° remarks: * orbital elements for (1819) Laputa : Mean anomaly = 265.47698237 deg Arg. of pericenter = 166.88013407 deg Long. of node = 122.26649009 deg Inclination = 23.89334598 deg Eccentricity = 0.22417868 Semimajor axis = 3.14047693 AU Perihelion dist = 2.43644895 AU Mag: H = 10.31, G = 0.15 Epoch of elements : MJD 54588.41000000 TDT (2008 May 02.410) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 2 1819 Laputa 9h 49.4m UT 10.9 10 41 47.127 30 10 59.51TYC 2512-00545-1 11.3 16.0 49 10.1 2.909 0.186 -7.93 152.4234 30.185 31.90 15.55 9.8226 -0.54042 -0.16224 0.79254 -2.62184 0.00479 -0.00278 2000 263.9875982008 424.00000166.880134122.266490 23.8933460.22417868 3.1404769 2.436449010.2 5.00.15 RATE 1.7709680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.026 87 2.20 0.028 0 54579.5020080502_0545-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 03:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org