IOTA/IOTA-ES occultation update for (344) Desiderata / TYC 0892-00249-1 event on 2008 Apr 02, 11:32 UT Visible from New Guinea Summary ------- On 2008 Apr 02 UT, the 127 km diameter asteroid (344) Desiderata will occult a 11.3 mag star in the constellation Virgo for observers along a path across New Guinea. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.7 mag to 11.2 mag (the magnitude of the asteroid) for at most 10.9 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: 99 * date and approx. time of event: 2008 Apr 02, 11:23 - 2008 Apr 02, 11:41 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 0.7 * estimated maximum duration [s]: 10.9 * Moon: 16 % sunlit, 126° distance * Sun: 162° distance * rough path description: New Guinea The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .029", 110° ) * approx speed of asteroid's shadow [km/s]: 11.5619 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0892-00249-1 by 344 Desiderata on 2008 Apr 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 ' " Latitude Latitude Latitude Latitude 108 0 0 - 7 14 21 11 41 2 1 80 -13 - 6 38 39 - 7 50 8 - 6 21 32 - 8 7 21 109 0 0 - 7 4 10 11 41 2 2 80 -14 - 6 28 28 - 7 39 56 - 6 11 22 - 7 57 8 110 0 0 - 6 54 4 11 41 1 3 80 -15 - 6 18 23 - 7 29 50 - 6 1 17 - 7 47 2 111 0 0 - 6 44 4 11 41 1 4 80 -16 - 6 8 24 - 7 19 50 - 5 51 18 - 7 37 1 112 0 0 - 6 34 11 11 41 0 5 80 -17 - 5 58 31 - 7 9 55 - 5 41 25 - 7 27 7 113 0 0 - 6 24 23 11 40 59 6 80 -18 - 5 48 44 - 7 0 7 - 5 31 39 - 7 17 18 114 0 0 - 6 14 43 11 40 58 7 79 -19 - 5 39 4 - 6 50 26 - 5 21 59 - 7 7 36 115 0 0 - 6 5 8 11 40 57 8 79 -20 - 5 29 30 - 6 40 51 - 5 12 26 - 6 58 1 116 0 0 - 5 55 41 11 40 55 9 79 -21 - 5 20 4 - 6 31 23 - 5 2 59 - 6 48 33 117 0 0 - 5 46 20 11 40 54 10 79 -22 - 5 10 44 - 6 22 2 - 4 53 40 - 6 39 11 118 0 0 - 5 37 7 11 40 52 11 79 -23 - 5 1 31 - 6 12 47 - 4 44 27 - 6 29 57 119 0 0 - 5 28 1 11 40 50 12 79 -24 - 4 52 26 - 6 3 41 - 4 35 22 - 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4 11 34 - 5 56 49 -133 0 0 - 5 12 39 11 27 37 59 298 -52 - 4 37 8 - 5 48 16 - 4 20 6 - 6 5 23 -132 0 0 - 5 21 20 11 27 29 58 298 -51 - 4 45 47 - 5 56 56 - 4 28 45 - 6 14 4 -131 0 0 - 5 30 7 11 27 20 57 297 -50 - 4 54 34 - 6 5 44 - 4 37 31 - 6 22 52 -130 0 0 - 5 39 0 11 27 13 56 296 -49 - 5 3 27 - 6 14 39 - 4 46 24 - 6 31 47 -129 0 0 - 5 48 1 11 27 5 55 296 -48 - 5 12 27 - 6 23 40 - 4 55 24 - 6 40 48 -128 0 0 - 5 57 8 11 26 57 54 295 -47 - 5 21 33 - 6 32 48 - 5 4 30 - 6 49 57 -127 0 0 - 6 6 22 11 26 49 53 295 -46 - 5 30 46 - 6 42 2 - 5 13 43 - 6 59 11 -126 0 0 - 6 15 42 11 26 42 52 295 -45 - 5 40 6 - 6 51 22 - 5 23 2 - 7 8 32 -125 0 0 - 6 25 8 11 26 34 51 294 -44 - 5 49 31 - 7 0 49 - 5 32 27 - 7 17 59 -124 0 0 - 6 34 39 11 26 27 50 294 -44 - 5 59 2 - 7 10 21 - 5 41 58 - 7 27 31 -123 0 0 - 6 44 17 11 26 19 49 293 -43 - 6 8 39 - 7 20 0 - 5 51 35 - 7 37 10 -122 0 0 - 6 54 0 11 26 12 48 293 -42 - 6 18 22 - 7 29 44 - 6 1 17 - 7 46 54 -121 0 0 - 7 3 49 11 26 5 47 293 -41 - 6 28 10 - 7 39 33 - 6 11 5 - 7 56 44 -120 0 0 - 7 13 43 11 25 58 46 292 -40 - 6 38 3 - 7 49 27 - 6 20 58 - 8 6 38 -119 0 0 - 7 23 42 11 25 51 45 292 -39 - 6 48 2 - 7 59 27 - 6 30 56 - 8 16 38 -118 0 0 - 7 33 46 11 25 44 44 292 -38 - 6 58 6 - 8 9 32 - 6 41 0 - 8 26 43 -117 0 0 - 7 43 55 11 25 38 44 291 -37 - 7 8 14 - 8 19 41 - 6 51 8 - 8 36 53 -116 0 0 - 7 54 8 11 25 31 43 291 -36 - 7 18 27 - 8 29 55 - 7 1 20 - 8 47 7 -115 0 0 - 8 4 26 11 25 25 42 291 -35 - 7 28 44 - 8 40 13 - 7 11 37 - 8 57 26 -114 0 0 - 8 14 48 11 25 18 41 290 -34 - 7 39 6 - 8 50 36 - 7 21 59 - 9 7 48 -113 0 0 - 8 25 14 11 25 12 40 290 -33 - 7 49 31 - 9 1 2 - 7 32 24 - 9 18 15 -112 0 0 - 8 35 44 11 25 6 39 290 -32 - 8 0 1 - 9 11 33 - 7 42 53 - 9 28 46 -111 0 0 - 8 46 18 11 25 0 38 290 -31 - 8 10 34 - 9 22 7 - 7 53 26 - 9 39 20 -110 0 0 - 8 56 55 11 24 54 37 289 -30 - 8 21 11 - 9 32 44 - 8 4 3 - 9 49 58 -109 0 0 - 9 7 36 11 24 48 36 289 -29 - 8 31 51 - 9 43 25 - 8 14 43 -10 0 39 -108 0 0 - 9 18 19 11 24 43 35 289 -28 - 8 42 34 - 9 54 9 - 8 25 26 -10 11 23 -107 0 0 - 9 29 6 11 24 37 34 288 -27 - 8 53 20 -10 4 56 - 8 36 12 -10 22 10 -106 0 0 - 9 39 55 11 24 32 33 288 -26 - 9 4 9 -10 15 46 - 8 47 0 -10 33 0 -105 0 0 - 9 50 47 11 24 27 32 288 -25 - 9 15 0 -10 26 38 - 8 57 52 -10 43 52 -104 0 0 -10 1 41 11 24 22 31 288 -24 - 9 25 54 -10 37 32 - 9 8 45 -10 54 46 -103 0 0 -10 12 37 11 24 17 30 287 -23 - 9 36 50 -10 48 28 - 9 19 41 -11 5 43 -102 0 0 -10 23 35 11 24 12 29 287 -22 - 9 47 48 -10 59 27 - 9 30 39 -11 16 41 -101 0 0 -10 34 35 11 24 8 28 287 -21 - 9 58 47 -11 10 27 - 9 41 38 -11 27 42 -100 0 0 -10 45 36 11 24 3 27 287 -20 -10 9 48 -11 21 28 - 9 52 39 -11 38 43 - 99 0 0 -10 56 39 11 23 59 26 287 -19 -10 20 51 -11 32 31 -10 3 42 -11 49 46 - 98 0 0 -11 7 42 11 23 55 25 286 -19 -10 31 55 -11 43 35 -10 14 45 -12 0 50 - 97 0 0 -11 18 47 11 23 51 24 286 -18 -10 42 59 -11 54 40 -10 25 50 -12 11 55 - 96 0 0 -11 29 53 11 23 47 23 286 -17 -10 54 4 -12 5 46 -10 36 55 -12 23 1 - 95 0 0 -11 40 58 11 23 43 22 286 -16 -11 5 10 -12 16 52 -10 48 1 -12 34 7 - 94 0 0 -11 52 5 11 23 40 21 285 -15 -11 16 16 -12 27 58 -10 59 7 -12 45 13 - 93 0 0 -12 3 11 11 23 36 20 285 -14 -11 27 22 -12 39 4 -11 10 13 -12 56 19 - 92 0 0 -12 14 17 11 23 33 19 285 -13 -11 38 29 -12 50 10 -11 21 19 -13 7 26 - 91 0 0 -12 25 23 11 23 30 18 285 -12 -11 49 34 -13 1 16 -11 32 25 -13 18 31 - 90 0 0 -12 36 28 11 23 27 17 284 -11 -12 0 40 -13 12 21 -11 43 30 -13 29 37 - 89 0 0 -12 47 33 11 23 24 16 284 -10 -12 11 44 -13 23 26 -11 54 35 -13 40 41 - 88 0 0 -12 58 36 11 23 22 15 284 -9 -12 22 48 -13 34 29 -12 5 38 -13 51 44 - 87 0 0 -13 9 38 11 23 19 14 284 -8 -12 33 50 -13 45 31 -12 16 41 -14 2 47 - 86 0 0 -13 20 39 11 23 17 13 284 -7 -12 44 51 -13 56 32 -12 27 42 -14 13 47 - 85 0 0 -13 31 39 11 23 15 12 283 -6 -12 55 51 -14 7 31 -12 38 41 -14 24 47 - 84 0 0 -13 42 36 11 23 13 11 283 -5 -13 6 48 -14 18 29 -12 49 39 -14 35 44 - 83 0 0 -13 53 32 11 23 11 10 283 -4 -13 17 44 -14 29 24 -13 0 35 -14 46 39 - 82 0 0 -14 4 25 11 23 9 9 283 -3 -13 28 38 -14 40 17 -13 11 29 -14 57 32 - 81 0 0 -14 15 16 11 23 8 8 282 -2 -13 39 29 -14 51 8 -13 22 20 -15 8 23 - 80 0 0 -14 26 4 11 23 6 7 282 -1 -13 50 17 -15 1 56 -13 33 8 -15 19 10 - 79 0 0 -14 36 50 11 23 5 6 282 0 -14 1 3 -15 12 41 -13 43 54 -15 29 55 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 0892-00249-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 28 41.8926 DE: +09 44 20.037 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .024 ) * V mag [mag]: 11.3 * B mag [mag]: 12.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (344) Desiderata approx. diameter [km]: 127 approx. diameter ["]: .126 distance from Earth [AU]: 1.38900 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 747 number of rejected observations: 67 time covered by the observations: 1909 Dec 16 - 2008 Feb 06 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.019, 131° remarks: * orbital elements for (344) Desiderata : Mean anomaly = 303.94146141 deg Arg. of pericenter = 237.45033651 deg Long. of node = 48.23630540 deg Inclination = 18.35614718 deg Eccentricity = 0.31630331 Semimajor axis = 2.59393037 AU Perihelion dist = 1.77346160 AU Mag: H = 8.20, G = 0.15 Epoch of elements : MJD 54558.48100000 TDT (2008 Apr 02.481) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 2 344 Desiderata 11h 32.0m UT 11.3 13 28 41.893 9 44 20.04TYC 0892-00249-1 12.1 11.2 127 10.9 1.389 -2.788 3.04 -162.0179 9.738 7.87 5.18 11.5338 -0.01469 -0.20183 -6.50809 0.48088 -0.00101 -0.00141 2000 301.9406152008 325.00000237.450337 48.236305 18.3561470.31630331 2.5939304 1.7734616 8.1 5.00.15 RATE 2.3592100 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.029 110 1.24 0.030 0 54553.5020080402_0249-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org