IOTA/IOTA-ES occultation update for (1264) Letaba / TYC 1746-00863-1 event on 2007 Jul 02, 04:23 UT Visible from S Africa Summary ------- On 2007 Jul 02 UT, the 75 km diameter asteroid (1264) Letaba will occult a 10.9 mag star in the constellation Pisces for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.9 mag to 14.7 mag (the magnitude of the asteroid) for at most 3.4 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: 83 * date and approx. time of event: 2007 Jul 02, 04:20 - 2007 Jul 02, 04:27 UT * midpoint of event [JD]: 2454283.68314167 * magnitude of target star: 10.9 * magnitude drop [mag]: 3.9 * estimated maximum duration [s]: 3.4 * Moon: 97 % sunlit, 88° distance * Sun: 75° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 107 * 1 sigma uncertainty interval [path widths]: +/- 0.63 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .024", .021", 92° ) * approx speed of asteroid's shadow [km/s]: 22.3833 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1746-00863-1 by 1264 Letaba on 2007 Jul 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 ' " Longitude Longitude Longitude Longitude 4 46 48 -59 0 0 4 20 25 1 23 -30 5 47 47 3 46 2 7 4 58 ... .. .. 5 37 20 -58 0 0 4 20 25 2 22 -30 6 36 47 4 38 6 7 52 2 ... .. .. 6 27 23 -57 0 0 4 20 25 3 22 -30 7 25 25 5 29 35 8 38 52 ... .. .. 7 17 4 -56 0 0 4 20 26 4 21 -29 8 13 46 6 20 35 9 25 34 ... .. .. 8 6 26 -55 0 0 4 20 26 5 20 -29 9 1 54 7 11 11 10 12 10 ... .. .. 8 55 33 -54 0 0 4 20 27 6 20 -28 9 49 53 8 1 27 10 58 43 6 53 35 9 44 30 -53 0 0 4 20 28 7 19 -28 10 37 47 8 51 27 11 45 17 7 44 56 10 33 19 -52 0 0 4 20 29 8 18 -27 11 25 38 9 41 16 12 31 54 8 36 0 11 22 5 -51 0 0 4 20 30 9 18 -27 12 13 29 10 30 57 13 18 37 9 26 50 12 10 51 -50 0 0 4 20 31 11 17 -26 13 1 24 11 20 33 14 5 29 10 17 31 12 59 39 -49 0 0 4 20 33 12 16 -25 13 49 25 12 10 9 14 52 31 11 8 6 13 48 33 -48 0 0 4 20 35 13 16 -25 14 37 36 12 59 46 15 39 47 11 58 39 14 37 36 -47 0 0 4 20 37 14 15 -24 15 25 58 13 49 29 16 27 20 12 49 12 15 26 49 -46 0 0 4 20 39 15 14 -23 16 14 35 14 39 19 17 15 11 13 39 50 16 16 17 -45 0 0 4 20 41 16 14 -23 17 3 29 15 29 21 18 3 23 14 30 35 17 6 2 -44 0 0 4 20 43 17 13 -22 17 52 43 16 19 37 18 51 58 15 21 31 17 56 6 -43 0 0 4 20 46 18 12 -21 18 42 20 17 10 10 19 41 0 16 12 40 18 46 33 -42 0 0 4 20 48 19 12 -20 19 32 21 18 1 2 20 30 30 17 4 5 19 37 25 -41 0 0 4 20 51 20 11 -19 20 22 51 18 52 17 21 20 32 17 55 49 20 28 45 -40 0 0 4 20 54 22 10 -18 21 13 51 19 43 57 22 11 8 18 47 56 21 20 36 -39 0 0 4 20 57 23 9 -17 22 5 25 20 36 6 23 2 20 19 40 28 22 13 2 -38 0 0 4 21 1 24 9 -17 22 57 35 21 28 47 23 54 13 20 33 28 23 6 4 -37 0 0 4 21 4 25 8 -16 23 50 26 22 22 2 24 46 49 21 27 1 23 59 47 -36 0 0 4 21 8 26 7 -15 24 43 59 23 15 56 25 40 11 22 21 8 24 54 15 -35 0 0 4 21 12 27 6 -14 25 38 19 24 10 31 26 34 23 23 15 54 25 49 30 -34 0 0 4 21 16 28 5 -12 26 33 30 25 5 51 27 29 29 24 11 21 26 45 37 -33 0 0 4 21 21 29 4 -11 27 29 35 26 2 1 28 25 33 25 7 35 27 42 39 -32 0 0 4 21 25 30 3 -10 28 26 38 26 59 3 29 22 39 26 4 39 28 40 42 -31 0 0 4 21 30 31 2 -9 29 24 45 27 57 3 30 20 52 27 2 36 29 39 50 -30 0 0 4 21 35 32 1 -8 30 24 0 28 56 5 31 20 17 28 1 33 30 40 8 -29 0 0 4 21 40 33 0 -7 31 24 28 29 56 15 32 21 0 29 1 33 31 41 43 -28 0 0 4 21 45 34 359 -5 32 26 16 30 57 38 33 23 6 30 2 42 32 44 40 -27 0 0 4 21 51 35 358 -4 33 29 30 32 0 19 34 26 44 31 5 6 33 49 6 -26 0 0 4 21 57 36 357 -3 34 34 17 33 4 26 35 31 59 32 8 50 34 55 9 -25 0 0 4 22 3 37 355 -2 35 40 45 34 10 5 36 39 2 33 14 3 36 2 57 -24 0 0 4 22 9 38 354 0 36 49 3 35 17 26 37 48 0 34 20 52 37 12 40 -23 0 0 4 22 16 39 353 1 37 59 21 36 26 36 38 59 6 35 29 25 38 24 29 -22 0 0 4 22 22 40 351 3 39 11 50 37 37 47 40 12 31 36 39 51 39 38 36 -21 0 0 4 22 29 40 350 4 40 26 45 38 51 10 41 28 31 37 52 23 40 55 16 -20 0 0 4 22 37 41 348 6 41 44 19 40 6 59 42 47 20 39 7 11 42 14 44 -19 0 0 4 22 44 42 346 7 43 4 52 41 25 28 44 9 20 40 24 31 43 37 21 -18 0 0 4 22 52 43 344 9 44 28 43 42 46 56 45 34 53 41 44 39 45 3 29 -17 0 0 4 23 1 43 342 11 45 56 18 44 11 44 47 4 28 43 7 54 46 33 37 -16 0 0 4 23 9 44 340 12 47 28 8 45 40 18 48 38 39 44 34 40 48 8 19 -15 0 0 4 23 18 44 338 14 49 4 50 47 13 8 50 18 10 46 5 23 49 48 17 -14 0 0 4 23 28 44 336 16 50 47 13 48 50 54 52 3 56 47 40 38 51 34 26 -13 0 0 4 23 38 44 333 18 52 36 18 50 34 25 53 57 12 49 21 8 53 27 59 -12 0 0 4 23 49 44 331 20 54 33 30 52 24 42 55 59 40 51 7 46 55 30 36 -11 0 0 4 24 0 44 328 23 56 40 45 54 23 12 58 13 45 53 1 44 Latitude Latitude Latitude Latitude 56 0 0 -10 46 20 4 24 3 44 328 23 -11 18 38 -10 14 22 -11 59 51 - 9 34 34 57 0 0 -10 19 20 4 24 8 44 326 24 -10 51 23 - 9 47 36 -11 32 16 - 9 8 4 58 0 0 - 9 53 28 4 24 14 44 325 25 -10 25 18 - 9 21 58 -11 5 53 - 8 42 43 59 0 0 - 9 28 46 4 24 19 43 324 26 -10 0 22 - 8 57 29 -10 40 40 - 8 18 29 60 0 0 - 9 5 12 4 24 24 43 323 27 - 9 36 36 - 8 34 7 -10 16 37 - 7 55 22 61 0 0 - 8 42 45 4 24 29 43 322 29 - 9 13 57 - 8 11 51 - 9 53 43 - 7 33 21 62 0 0 - 8 21 26 4 24 35 43 321 30 - 8 52 26 - 7 50 43 - 9 31 58 - 7 12 26 63 0 0 - 8 1 13 4 24 40 42 320 31 - 8 32 3 - 7 30 40 - 9 11 20 - 6 52 36 64 0 0 - 7 42 6 4 24 45 42 319 32 - 8 12 46 - 7 11 43 - 8 51 50 - 6 33 50 65 0 0 - 7 24 5 4 24 50 41 318 33 - 7 54 35 - 6 53 51 - 8 33 28 - 6 16 9 66 0 0 - 7 7 9 4 24 55 41 317 34 - 7 37 30 - 6 37 3 - 8 16 11 - 5 59 32 67 0 0 - 6 51 17 4 24 59 40 316 35 - 7 21 31 - 6 21 20 - 8 0 1 - 5 43 59 68 0 0 - 6 36 30 4 25 4 40 315 36 - 7 6 36 - 6 6 40 - 7 44 56 - 5 29 28 69 0 0 - 6 22 47 4 25 9 39 314 37 - 6 52 46 - 5 53 4 - 7 30 56 - 5 16 0 70 0 0 - 6 10 7 4 25 13 39 313 37 - 6 39 59 - 5 40 30 - 7 18 1 - 5 3 34 71 0 0 - 5 58 30 4 25 18 38 313 38 - 6 28 16 - 5 28 59 - 7 6 11 - 4 52 10 72 0 0 - 5 47 56 4 25 22 37 312 39 - 6 17 37 - 5 18 30 - 6 55 24 - 4 41 48 73 0 0 - 5 38 24 4 25 27 37 311 40 - 6 8 0 - 5 9 4 - 6 45 41 - 4 32 27 74 0 0 - 5 29 54 4 25 31 36 311 41 - 5 59 26 - 5 0 38 - 6 37 1 - 4 24 7 75 0 0 - 5 22 26 4 25 35 35 310 42 - 5 51 54 - 4 53 14 - 6 29 24 - 4 16 48 76 0 0 - 5 16 0 4 25 39 35 309 43 - 5 45 24 - 4 46 51 - 6 22 50 - 4 10 29 77 0 0 - 5 10 35 4 25 44 34 309 44 - 5 39 56 - 4 41 29 - 6 17 18 - 4 5 10 78 0 0 - 5 6 11 4 25 48 33 308 45 - 5 35 30 - 4 37 8 - 6 12 49 - 4 0 52 79 0 0 - 5 2 49 4 25 51 32 308 45 - 5 32 6 - 4 33 47 - 6 9 22 - 3 57 33 80 0 0 - 5 0 27 4 25 55 32 307 46 - 5 29 42 - 4 31 26 - 6 6 56 - 3 55 14 81 0 0 - 4 59 5 4 25 59 31 307 47 - 5 28 20 - 4 30 6 - 6 5 33 - 3 53 55 82 0 0 - 4 58 45 4 26 3 30 306 48 - 5 27 59 - 4 29 46 - 6 5 11 - 3 53 36 83 0 0 - 4 59 25 4 26 6 29 306 48 - 5 28 39 - 4 30 26 - 6 5 51 - 3 54 15 84 0 0 - 5 1 5 4 26 10 28 305 49 - 5 30 19 - 4 32 6 - 6 7 33 - 3 55 55 85 0 0 - 5 3 46 4 26 13 27 305 50 - 5 33 1 - 4 34 45 - 6 10 16 - 3 58 33 86 0 0 - 5 7 27 4 26 16 27 305 50 - 5 36 44 - 4 38 25 - 6 14 0 - 4 2 11 87 0 0 - 5 12 9 4 26 19 26 304 51 - 5 41 28 - 4 43 5 - 6 18 46 - 4 6 49 88 0 0 - 5 17 51 4 26 22 25 304 52 - 5 47 12 - 4 48 45 - 6 24 34 - 4 12 26 89 0 0 - 5 24 34 4 26 25 24 304 52 - 5 53 58 - 4 55 25 - 6 31 23 - 4 19 2 90 0 0 - 5 32 17 4 26 28 23 303 53 - 6 1 45 - 5 3 5 - 6 39 15 - 4 26 38 91 0 0 - 5 41 1 4 26 31 22 303 53 - 6 10 33 - 5 11 45 - 6 48 8 - 4 35 14 92 0 0 - 5 50 46 4 26 34 21 303 54 - 6 20 22 - 5 21 26 - 6 58 3 - 4 44 49 93 0 0 - 6 1 33 4 26 36 20 303 54 - 6 31 13 - 5 32 7 - 7 9 1 - 4 55 25 94 0 0 - 6 13 20 4 26 39 19 302 55 - 6 43 6 - 5 43 50 - 7 21 1 - 5 7 1 95 0 0 - 6 26 9 4 26 41 18 302 55 - 6 56 1 - 5 56 33 - 7 34 3 - 5 19 37 96 0 0 - 6 40 0 4 26 43 17 302 55 - 7 9 58 - 6 10 17 - 7 48 9 - 5 33 14 97 0 0 - 6 54 52 4 26 46 16 302 56 - 7 24 58 - 6 25 3 - 8 3 17 - 5 47 51 98 0 0 - 7 10 47 4 26 48 15 302 56 - 7 41 0 - 6 40 51 - 8 19 29 - 6 3 30 99 0 0 - 7 27 44 4 26 49 14 301 56 - 7 58 6 - 6 57 40 - 8 36 45 - 6 20 10 100 0 0 - 7 45 45 4 26 51 13 301 56 - 8 16 14 - 7 15 32 - 8 55 5 - 6 37 51 101 0 0 - 8 4 48 4 26 53 12 301 56 - 8 35 27 - 7 34 26 - 9 14 29 - 6 56 35 102 0 0 - 8 24 54 4 26 54 11 301 56 - 8 55 43 - 7 54 23 - 9 34 58 - 7 16 20 103 0 0 - 8 46 4 4 26 56 10 301 56 - 9 17 3 - 8 15 23 - 9 56 32 - 7 37 8 104 0 0 - 9 8 19 4 26 57 9 300 56 - 9 39 29 - 8 37 27 -10 19 11 - 7 58 59 105 0 0 - 9 31 38 4 26 58 8 300 56 -10 2 59 - 9 0 35 -10 42 57 - 8 21 53 106 0 0 - 9 56 1 4 26 59 7 300 56 -10 27 35 - 9 24 47 -11 7 48 - 8 45 51 107 0 0 -10 21 30 4 27 0 6 300 56 -10 53 16 - 9 50 3 -11 33 46 - 9 10 52 108 0 0 -10 48 4 4 27 1 5 300 56 -11 20 4 -10 16 25 -12 0 51 .. .. .. 109 0 0 -11 15 45 4 27 1 4 299 55 -11 47 58 -10 43 51 -12 29 4 .. .. .. 110 0 0 -11 44 31 4 27 2 3 299 55 -12 16 59 -11 12 24 -12 58 25 .. .. .. 111 0 0 -12 14 25 4 27 2 2 299 55 -12 47 8 .. .. .. -13 28 54 .. .. .. 112 0 0 -12 45 25 4 27 2 1 299 54 -13 18 25 .. .. .. -14 0 31 .. .. .. Data for the target star ------------------------ * name: TYC 1746-00863-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 04 07.4881 DE: +27 48 37.452 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .016 ) * V mag [mag]: 10.9 * B mag [mag]: 11.3 * Apparent position with proper motion RA(deg): 16.1331966931 DE(deg): 27.8495567459 * Equation of equinoxes (radians) : 0.000028290425312 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1264) Letaba approx. diameter [km]: 75 approx. diameter ["]: .035 distance from Earth [AU]: 2.93000 * orbital information: orbit source: Preston date of fit: 2007 Apr 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 597 number of rejected observations: 53 time covered by the observations: 1933 Apr 20 - 2006 Sep 30 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.014, 93° remarks: * orbital elements for (1264) Letaba : Mean anomaly = 78.43626869 deg Arg. of pericenter = 29.75929941 deg Long. of node = 235.26643098 deg Inclination = 25.02402542 deg Eccentricity = 0.15723984 Semimajor axis = 2.86177323 AU Perihelion dist = 2.41178846 AU Mag: H = 9.46, G = 0.15 Epoch of elements : MJD 54283.18300000 TDT (2007 Jul 02.183) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 02 1264 Letaba 4h 23.7m UT 10.9 1 4 7.488 27 48 37.45TYC 1746-00863-1 11.3 14.7 75 3.4 2.930 2.452 19.49 -329.736 27.804 -244.95 23.07 4.3954 .36837 -.61239 10.83772 6.49278 -0.00507 -0.00169 2000 77.78824972007 629.00000 29.759299235.266431 25.0240250.157239842.861773232.411788469.1 5 0.15 RATE 2.0358757 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.024 0.021 91.7 1.630 0.022 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 May 28, 03:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org