IOTA/IOTA-ES occultation update for (1988) Delores / TYC 5564-00127-1 event on 2008 Mar 02, 07:50 UT Visible from Argentina, Chile Summary ------- On 2008 Mar 02 UT, the 23 km diameter asteroid (1988) Delores will occult a 9.7 mag star in the constellation Libra for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.8 mag to 17.5 mag (the magnitude of the asteroid) for at most 8.2 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: UCAC. The event at a glimpse ---------------------- * Rank: 23 * date and approx. time of event: 2008 Mar 02, 07:17 - 2008 Mar 02, 08:04 UT * magnitude of target star: 9.7 * magnitude drop [mag]: 7.8 * estimated maximum duration [s]: 8.2 * Moon: 29 % sunlit, 58° distance * Sun: 123° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 2.91 * 1 sigma uncertainty interval [seconds]: +/- 22.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .055 +/- .055) * 1 sigma uncertainty ellipse (major, minor, PA): ( .055", .054", 141° ) * approx speed of asteroid's shadow [km/s]: 2.8082 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5564-00127-1 by 1988 Delores on 2008 Mar 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 -151 0 0 -50 39 38 7 17 23 1 103 -21 -50 46 46 -50 32 30 -51 28 26 .. .. .. -150 0 0 -50 48 43 7 17 24 1 103 -21 -50 55 50 -50 41 36 -51 37 24 .. .. .. -149 0 0 -50 57 27 7 17 24 2 102 -21 -51 4 33 -50 50 21 -51 46 1 .. .. .. -148 0 0 -51 5 50 7 17 26 2 101 -22 -51 12 55 -50 58 45 -51 54 18 .. .. .. -147 0 0 -51 13 53 7 17 27 3 100 -22 -51 20 57 -51 6 49 -52 2 14 .. .. .. -146 0 0 -51 21 34 7 17 29 4 99 -23 -51 28 38 -51 14 32 -52 9 50 -50 33 38 -145 0 0 -51 28 56 7 17 31 4 99 -23 -51 35 58 -51 21 54 -52 17 5 -50 41 5 -144 0 0 -51 35 56 7 17 33 5 98 -23 -51 42 58 -51 28 55 -52 24 0 -50 48 11 -143 0 0 -51 42 36 7 17 36 6 97 -24 -51 49 37 -51 35 36 -52 30 34 -50 54 57 -142 0 0 -51 48 56 7 17 38 6 96 -24 -51 55 56 -51 41 56 -52 36 48 -51 1 21 -141 0 0 -51 54 54 7 17 42 7 95 -24 -52 1 54 -51 47 56 -52 42 42 -51 7 25 -140 0 0 -52 0 33 7 17 45 8 95 -24 -52 7 31 -51 53 35 -52 48 15 -51 13 9 -139 0 0 -52 5 51 7 17 49 8 94 -25 -52 12 49 -51 58 53 -52 53 28 -51 18 31 -138 0 0 -52 10 48 7 17 53 9 93 -25 -52 17 45 -52 3 51 -52 58 21 -51 23 33 -137 0 0 -52 15 25 7 17 57 9 92 -25 -52 22 22 -52 8 29 -53 2 54 -51 28 14 -136 0 0 -52 19 42 7 18 2 10 91 -26 -52 26 38 -52 12 46 -53 7 6 -51 32 35 -135 0 0 -52 23 38 7 18 7 11 91 -26 -52 30 33 -52 16 43 -53 10 58 -51 36 35 -134 0 0 -52 27 13 7 18 12 11 90 -26 -52 34 8 -52 20 19 -53 14 30 -51 40 14 -133 0 0 -52 30 28 7 18 18 12 89 -26 -52 37 23 -52 23 34 -53 17 42 -51 43 33 -132 0 0 -52 33 23 7 18 24 13 88 -27 -52 40 17 -52 26 30 -53 20 33 -51 46 31 -131 0 0 -52 35 57 7 18 30 13 87 -27 -52 42 51 -52 29 4 -53 23 4 -51 49 8 -130 0 0 -52 38 11 7 18 36 14 87 -27 -52 45 4 -52 31 18 -53 25 15 -51 51 24 -129 0 0 -52 40 4 7 18 43 14 86 -27 -52 46 57 -52 33 12 -53 27 6 -51 53 20 -128 0 0 -52 41 37 7 18 50 15 85 -28 -52 48 29 -52 34 45 -53 28 36 -51 54 54 -127 0 0 -52 42 48 7 18 57 16 84 -28 -52 49 41 -52 35 57 -53 29 46 -51 56 8 -126 0 0 -52 43 40 7 19 5 16 83 -28 -52 50 32 -52 36 48 -53 30 36 -51 57 1 -125 0 0 -52 44 10 7 19 13 17 82 -28 -52 51 2 -52 37 19 -53 31 5 -51 57 33 -124 0 0 -52 44 20 7 19 21 18 81 -29 -52 51 11 -52 37 29 -53 31 13 -51 57 44 -123 0 0 -52 44 9 7 19 29 18 81 -29 -52 51 0 -52 37 18 -53 31 1 -51 57 34 -122 0 0 -52 43 37 7 19 38 19 80 -29 -52 50 28 -52 36 46 -53 30 28 -51 57 3 -121 0 0 -52 42 44 7 19 47 19 79 -29 -52 49 35 -52 35 53 -53 29 35 -51 56 10 -120 0 0 -52 41 29 7 19 56 20 78 -29 -52 48 21 -52 34 39 -53 28 21 -51 54 56 -119 0 0 -52 39 54 7 20 6 21 77 -30 -52 46 45 -52 33 3 -53 26 45 -51 53 20 -118 0 0 -52 37 57 7 20 16 21 76 -30 -52 44 48 -52 31 6 -53 24 49 -51 51 23 -117 0 0 -52 35 39 7 20 26 22 75 -30 -52 42 30 -52 28 48 -53 22 31 -51 49 4 -116 0 0 -52 32 59 7 20 36 23 75 -30 -52 39 51 -52 26 8 -53 19 52 -51 46 23 -115 0 0 -52 29 58 7 20 47 23 74 -30 -52 36 49 -52 23 6 -53 16 52 -51 43 21 -114 0 0 -52 26 34 7 20 58 24 73 -30 -52 33 26 -52 19 43 -53 13 30 -51 39 56 -113 0 0 -52 22 49 7 21 10 24 72 -31 -52 29 41 -52 15 57 -53 9 47 -51 36 8 -112 0 0 -52 18 41 7 21 22 25 71 -31 -52 25 34 -52 11 49 -53 5 41 -51 31 59 -111 0 0 -52 14 11 7 21 34 26 70 -31 -52 21 4 -52 7 19 -53 1 14 -51 27 26 -110 0 0 -52 9 19 7 21 46 26 69 -31 -52 16 12 -52 2 26 -52 56 24 -51 22 31 -109 0 0 -52 4 4 7 21 59 27 68 -31 -52 10 57 -51 57 10 -52 51 12 -51 17 13 -108 0 0 -51 58 25 7 22 12 28 67 -31 -52 5 19 -51 51 32 -52 45 37 -51 11 32 -107 0 0 -51 52 24 7 22 26 28 67 -31 -51 59 19 -51 45 30 -52 39 40 -51 5 27 -106 0 0 -51 46 0 7 22 40 29 66 -31 -51 52 55 -51 39 5 -52 33 19 -50 58 58 -105 0 0 -51 39 11 7 22 54 30 65 -31 -51 46 7 -51 32 16 -52 26 35 -50 52 6 -104 0 0 -51 31 59 7 23 9 30 64 -31 -51 38 56 -51 25 3 -52 19 27 -50 44 49 -103 0 0 -51 24 23 7 23 24 31 63 -32 -51 31 20 -51 17 26 -52 11 56 -50 37 8 -102 0 0 -51 16 23 7 23 39 31 62 -32 -51 23 21 -51 9 25 -52 4 1 -50 29 3 -101 0 0 -51 7 58 7 23 55 32 61 -32 -51 14 56 -51 0 59 -51 55 41 -50 20 32 -100 0 0 -50 59 8 7 24 11 33 60 -32 -51 6 7 -50 52 9 -51 46 57 -50 11 37 - 99 0 0 -50 49 53 7 24 27 33 59 -32 -50 56 53 -50 42 53 -51 37 48 -50 2 16 - 98 0 0 -50 40 12 7 24 44 34 58 -32 -50 47 14 -50 33 11 -51 28 14 -49 52 29 - 97 0 0 -50 30 6 7 25 2 35 57 -32 -50 37 8 -50 23 4 -51 18 15 -49 42 16 - 96 0 0 -50 19 34 7 25 19 35 56 -32 -50 26 37 -50 12 31 -51 7 49 -49 31 37 - 95 0 0 -50 8 35 7 25 38 36 55 -32 -50 15 39 -50 1 31 -50 56 58 -49 20 31 - 94 0 0 -49 57 9 7 25 56 37 54 -32 -50 4 15 -49 50 4 -50 45 40 -49 8 58 - 93 0 0 -49 45 17 7 26 15 37 53 -32 -49 52 24 -49 38 11 -50 33 56 -48 56 57 - 92 0 0 -49 32 57 7 26 35 38 52 -32 -49 40 5 -49 25 50 -50 21 44 -48 44 29 - 91 0 0 -49 20 9 7 26 55 39 51 -32 -49 27 19 -49 13 1 -50 9 5 -48 31 33 - 90 0 0 -49 6 54 7 27 15 40 50 -32 -49 14 4 -48 59 44 -49 55 58 -48 18 9 - 89 0 0 -48 53 9 7 27 36 40 49 -32 -49 0 21 -48 45 58 -49 42 23 -48 4 15 - 88 0 0 -48 38 56 7 27 58 41 48 -31 -48 46 9 -48 31 43 -49 28 19 -47 49 53 - 87 0 0 -48 24 14 7 28 20 42 47 -31 -48 31 29 -48 17 0 -49 13 47 -47 35 1 - 86 0 0 -48 9 2 7 28 43 42 46 -31 -48 16 18 -48 1 46 -48 58 45 -47 19 39 - 85 0 0 -47 53 20 7 29 6 43 44 -31 -48 0 38 -47 46 3 -48 43 13 -47 3 47 - 84 0 0 -47 37 8 7 29 29 44 43 -31 -47 44 27 -47 29 49 -48 27 12 -46 47 24 - 83 0 0 -47 20 25 7 29 53 44 42 -31 -47 27 45 -47 13 4 -48 10 39 -46 30 30 - 82 0 0 -47 3 10 7 30 18 45 41 -31 -47 10 33 -46 55 48 -47 53 36 -46 13 5 - 81 0 0 -46 45 25 7 30 43 46 40 -31 -46 52 49 -46 38 1 -47 36 2 -45 55 8 - 80 0 0 -46 27 7 7 31 9 47 39 -30 -46 34 33 -46 19 42 -47 17 56 -45 36 38 - 79 0 0 -46 8 17 7 31 36 47 37 -30 -46 15 44 -46 0 50 -46 59 18 -45 17 36 - 78 0 0 -45 48 54 7 32 3 48 36 -30 -45 56 23 -45 41 25 -46 40 8 -44 58 2 - 77 0 0 -45 28 58 7 32 31 49 35 -30 -45 36 30 -45 21 28 -46 20 24 -44 37 54 - 76 0 0 -45 8 29 7 32 59 49 33 -30 -45 16 2 -45 0 57 -46 0 8 -44 17 12 - 75 0 0 -44 47 27 7 33 28 50 32 -29 -44 55 1 -44 39 52 -45 39 18 -43 55 56 - 74 0 0 -44 25 50 7 33 58 51 31 -29 -44 33 26 -44 18 13 -45 17 54 -43 34 7 - 73 0 0 -44 3 38 7 34 28 52 29 -29 -44 11 17 -43 56 0 -44 55 56 -43 11 42 - 72 0 0 -43 40 52 7 34 59 52 28 -28 -43 48 33 -43 33 12 -44 33 24 -42 48 43 - 71 0 0 -43 17 32 7 35 30 53 26 -28 -43 25 14 -43 9 49 -44 10 16 -42 25 9 - 70 0 0 -42 53 36 7 36 3 54 25 -28 -43 1 20 -42 45 52 -43 46 34 -42 0 59 - 69 0 0 -42 29 4 7 36 36 54 23 -27 -42 36 51 -42 21 18 -43 22 16 -41 36 15 - 68 0 0 -42 3 57 7 37 9 55 21 -27 -42 11 46 -41 56 9 -42 57 23 -41 10 54 - 67 0 0 -41 38 15 7 37 44 56 20 -27 -41 46 5 -41 30 25 -42 31 55 -40 44 58 - 66 0 0 -41 11 56 7 38 19 57 18 -26 -41 19 49 -41 4 4 -42 5 50 -40 18 25 - 65 0 0 -40 45 2 7 38 55 57 16 -26 -40 52 57 -40 37 8 -41 39 10 -39 51 17 - 64 0 0 -40 17 32 7 39 31 58 14 -25 -40 25 29 -40 9 36 -41 11 54 -39 23 34 - 63 0 0 -39 49 26 7 40 8 59 12 -25 -39 57 25 -39 41 28 -40 44 2 -38 55 14 - 62 0 0 -39 20 45 7 40 46 59 10 -25 -39 28 46 -39 12 44 -40 15 34 -38 26 19 - 61 0 0 -38 51 28 7 41 25 60 8 -24 -38 59 31 -38 43 25 -39 46 31 -37 56 48 - 60 0 0 -38 21 35 7 42 4 60 6 -24 -38 29 40 -38 13 31 -39 16 52 -37 26 43 - 59 0 0 -37 51 8 7 42 44 61 4 -23 -37 59 15 -37 43 2 -38 46 38 -36 56 2 - 58 0 0 -37 20 6 7 43 25 62 1 -22 -37 28 15 -37 11 58 -38 15 50 -36 24 47 - 57 0 0 -36 48 30 7 44 7 62 359 -22 -36 56 41 -36 40 20 -37 44 27 -35 52 59 - 56 0 0 -36 16 21 7 44 49 63 356 -21 -36 24 33 -36 8 9 -37 12 29 -35 20 37 - 55 0 0 -35 43 38 7 45 31 63 353 -21 -35 51 52 -35 35 24 -36 39 59 -34 47 42 - 54 0 0 -35 10 23 7 46 15 63 351 -20 -35 18 39 -35 2 8 -36 6 56 -34 14 16 - 53 0 0 -34 36 37 7 46 59 64 348 -19 -34 44 54 -34 28 20 -35 33 21 -33 40 18 - 52 0 0 -34 2 20 7 47 43 64 345 -19 -34 10 39 -33 54 2 -34 59 16 -33 5 51 - 51 0 0 -33 27 34 7 48 28 64 342 -18 -33 35 55 -33 19 14 -34 24 40 -32 30 55 - 50 0 0 -32 52 19 7 49 14 65 339 -17 -33 0 41 -32 43 58 -33 49 35 -31 55 30 - 49 0 0 -32 16 38 7 50 0 65 336 -16 -32 25 1 -32 8 15 -33 14 3 -31 19 40 - 48 0 0 -31 40 30 7 50 47 65 333 -16 -31 48 55 -31 32 6 -32 38 4 -30 43 24 - 47 0 0 -31 3 58 7 51 34 65 329 -15 -31 12 24 -30 55 33 -32 1 40 -30 6 44 - 46 0 0 -30 27 3 7 52 22 65 326 -14 -30 35 30 -30 18 37 -31 24 52 -29 29 42 - 45 0 0 -29 49 47 7 53 10 65 323 -13 -29 58 15 -29 41 20 -30 47 43 -28 52 20 - 44 0 0 -29 12 11 7 53 58 65 320 -12 -29 20 40 -29 3 43 -30 10 13 -28 14 39 - 43 0 0 -28 34 18 7 54 46 64 317 -12 -28 42 47 -28 25 49 -29 32 24 -27 36 41 - 42 0 0 -27 56 8 7 55 35 64 314 -11 -28 4 38 -27 47 39 -28 54 19 -26 58 27 - 41 0 0 -27 17 45 7 56 24 64 311 -10 -27 26 15 -27 9 15 -28 15 59 -26 20 1 - 40 0 0 -26 39 10 7 57 13 63 308 -9 -26 47 40 -26 30 39 -27 37 25 -25 41 23 - 39 0 0 -26 0 24 7 58 2 63 305 -8 -26 8 55 -25 51 54 -26 58 42 -25 2 37 - 38 0 0 -25 21 31 7 58 51 62 302 -7 -25 30 2 -25 13 1 -26 19 49 -24 23 44 - 37 0 0 -24 42 33 7 59 40 62 300 -6 -24 51 3 -24 34 2 -25 40 50 -23 44 46 - 36 0 0 -24 3 31 8 0 29 61 297 -5 -24 12 1 -23 55 1 -25 1 47 -23 5 45 - 35 0 0 -23 24 27 8 1 18 60 295 -4 -23 32 58 -23 15 58 -24 22 41 -22 26 45 - 34 0 0 -22 45 25 8 2 7 60 292 -3 -22 53 55 -22 36 56 -23 43 36 -21 47 46 - 33 0 0 -22 6 26 8 2 55 59 290 -2 -22 14 55 -21 57 58 -23 4 33 -21 8 51 - 32 0 0 -21 27 33 8 3 43 58 288 -1 -21 36 1 -21 19 5 -22 25 34 -20 30 3 - 31 0 0 -20 48 47 8 4 31 57 286 0 -20 57 15 -20 40 20 -21 46 43 -19 51 23 Uncertainty in time = +/- 23 secs [Prediction of 2008 Feb 27.0] Data for the target star ------------------------ * name: TYC 5564-00127-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 35 00.4255 DE: -08 49 02.712 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .018 ) * V mag [mag]: 9.7 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1988) Delores approx. diameter [km]: 23 approx. diameter ["]: .019 distance from Earth [AU]: 1.63300 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 728 number of rejected observations: 29 time covered by the observations: 1952 Sep 28 - 2008 Jan 18 1 sigma uncertainty ellipse (major, minor, PA): 0.053, 0.052, 137° remarks: * orbital elements for (1988) Delores : Mean anomaly = 224.03111277 deg Arg. of pericenter = 235.12048113 deg Long. of node = 106.42636309 deg Inclination = 4.25210414 deg Eccentricity = 0.10271887 Semimajor axis = 2.15342008 AU Perihelion dist = 1.93222320 AU Mag: H = 13.52, G = 0.15 Epoch of elements : MJD 54527.32700000 TDT (2008 Mar 02.327) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 2 1988 Delores 7h 51.6m UT 9.7 14 35 0.426- 8 49 2.71TYC 5564-00127-1 10.8 17.5 23 8.2 1.633 0.515 3.79 -59.6269 -8.819 65.13 -7.02 7.8600 0.18636 -0.37769 1.42100 0.70216 -0.00464 0.00119 2000 221.7458452008 224.00000235.120481106.426363 4.2521040.10271887 2.1534201 1.932223213.6 5.00.15 RATE 3.1189680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.055 0.054 141 3.91 0.056 0 54523.5020080302_0127-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 19:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org