IOTA/IOTA-ES occultation update for (1285) Julietta / TYC 1385-00734-1 event on 2008 Mar 30, 03:42 UT Visible from Argentina, Chile Summary ------- On 2008 Mar 30 UT, the 41 km diameter asteroid (1285) Julietta will occult a 11.4 mag star in the constellation Cancer 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 4.5 mag to 15.9 mag (the magnitude of the asteroid) for at most 7.3 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: 32 * date and approx. time of event: 2008 Mar 30, 03:36 - 2008 Mar 30, 04:02 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 7.3 * Moon: 47 % sunlit, 162° distance * Sun: 111° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 2.08 * 1 sigma uncertainty interval [seconds]: +/- 12.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .047) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .040", 4° ) * approx speed of asteroid's shadow [km/s]: 5.5877 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1385-00734-1 by 1285 Julietta on 2008 Mar 30 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 -141 0 0 24 49 12 3 36 49 69 99 0 24 37 9 25 1 14 23 46 59 25 51 17 -140 0 0 24 26 24 3 37 9 70 99 -1 24 14 18 24 38 29 23 23 55 25 28 45 -139 0 0 24 2 52 3 37 29 71 98 -2 23 50 43 24 15 1 23 0 7 25 5 29 -138 0 0 23 38 36 3 37 50 72 98 -3 23 26 24 23 50 48 22 35 35 24 41 30 -137 0 0 23 13 37 3 38 10 73 98 -4 23 1 21 23 25 52 22 10 18 24 16 48 -136 0 0 22 47 53 3 38 31 75 97 -5 22 35 34 23 0 11 21 44 16 23 51 21 -135 0 0 22 21 24 3 38 52 76 96 -6 22 9 2 22 33 46 21 17 30 23 25 10 -134 0 0 21 54 11 3 39 14 77 95 -8 21 41 45 22 6 36 20 49 59 22 58 14 -133 0 0 21 26 12 3 39 36 78 94 -9 21 13 43 21 38 41 20 21 43 22 30 34 -132 0 0 20 57 29 3 39 58 79 92 -10 20 44 56 21 10 2 19 52 41 22 2 9 -131 0 0 20 28 1 3 40 20 80 90 -11 20 15 25 20 40 37 19 22 54 21 32 59 -130 0 0 19 57 48 3 40 42 81 87 -12 19 45 8 20 10 28 18 52 23 21 3 5 -129 0 0 19 26 50 3 41 5 82 84 -13 19 14 6 19 39 33 18 21 6 20 32 26 -128 0 0 18 55 7 3 41 28 83 79 -14 18 42 20 19 7 54 17 49 4 20 1 2 -127 0 0 18 22 40 3 41 51 84 73 -15 18 9 49 18 35 30 17 16 17 19 28 53 -126 0 0 17 49 28 3 42 15 84 65 -16 17 36 33 18 2 22 16 42 46 18 56 1 -125 0 0 17 15 32 3 42 38 85 54 -17 17 2 33 17 28 30 16 8 31 18 22 24 -124 0 0 16 40 52 3 43 2 85 40 -19 16 27 50 16 53 54 15 33 33 17 48 3 -123 0 0 16 5 29 3 43 26 85 25 -20 15 52 23 16 18 34 14 57 51 17 12 59 -122 0 0 15 29 23 3 43 51 85 11 -21 15 16 14 15 42 32 14 21 26 16 37 11 -121 0 0 14 52 35 3 44 15 85 358 -22 14 39 22 15 5 48 13 44 19 16 0 42 -120 0 0 14 15 5 3 44 40 84 348 -23 14 1 49 14 28 21 13 6 31 15 23 31 -119 0 0 13 36 55 3 45 4 83 341 -24 13 23 34 13 50 14 12 28 2 14 45 38 -118 0 0 12 58 4 3 45 29 82 335 -25 12 44 41 13 11 27 11 48 54 14 7 6 -117 0 0 12 18 35 3 45 54 81 331 -27 12 5 8 12 32 1 11 9 7 13 27 54 -116 0 0 11 38 27 3 46 19 80 328 -28 11 24 57 11 51 57 10 28 43 12 48 3 -115 0 0 10 57 43 3 46 44 79 325 -29 10 44 10 11 11 16 9 47 42 12 7 36 -114 0 0 10 16 23 3 47 9 78 323 -30 10 2 47 10 30 0 9 6 6 11 26 32 -113 0 0 9 34 30 3 47 34 76 321 -31 9 20 50 9 48 9 8 23 57 10 44 54 -112 0 0 8 52 3 3 47 59 75 320 -33 8 38 20 9 5 45 7 41 15 10 2 42 -111 0 0 8 9 5 3 48 25 74 319 -34 7 55 20 8 22 50 6 58 3 9 19 58 -110 0 0 7 25 37 3 48 50 73 318 -35 7 11 49 7 39 25 6 14 22 8 36 44 -109 0 0 6 41 42 3 49 15 71 317 -36 6 27 51 6 55 32 5 30 14 7 53 2 -108 0 0 5 57 20 3 49 40 70 316 -37 5 43 28 6 11 12 4 45 40 7 8 52 -107 0 0 5 12 34 3 50 4 69 316 -39 4 58 39 5 26 29 4 0 44 6 24 18 -106 0 0 4 27 26 3 50 29 67 315 -40 4 13 29 4 41 23 3 15 25 5 39 20 -105 0 0 3 41 58 3 50 53 66 315 -41 3 27 59 3 55 56 2 29 48 4 54 1 -104 0 0 2 56 11 3 51 18 65 314 -42 2 42 11 3 10 11 1 43 53 4 8 23 -103 0 0 2 10 9 3 51 42 64 314 -43 1 56 7 2 24 10 0 57 43 3 22 28 -102 0 0 1 23 52 3 52 6 62 313 -45 1 9 49 1 37 55 0 11 20 2 36 18 -101 0 0 0 37 24 3 52 29 61 313 -46 0 23 20 0 51 28 - 0 35 13 1 49 55 -100 0 0 - 0 9 13 3 52 52 60 313 -47 - 0 23 18 0 4 51 - 1 21 55 1 3 23 - 99 0 0 - 0 55 57 3 53 15 58 312 -48 - 1 10 3 - 0 41 52 - 2 8 43 0 16 42 - 98 0 0 - 1 42 46 3 53 38 57 312 -49 - 1 56 52 - 1 28 41 - 2 55 34 - 0 30 5 - 97 0 0 - 2 29 38 3 54 0 56 312 -50 - 2 43 44 - 2 15 32 - 3 42 26 - 1 16 54 - 96 0 0 - 3 16 29 3 54 22 54 312 -52 - 3 30 35 - 3 2 23 - 4 29 18 - 2 3 45 - 95 0 0 - 4 3 18 3 54 43 53 311 -53 - 4 17 24 - 3 49 12 - 5 16 6 - 2 50 35 - 94 0 0 - 4 50 3 3 55 4 52 311 -54 - 5 4 9 - 4 35 57 - 6 2 49 - 3 37 22 - 93 0 0 - 5 36 41 3 55 25 50 311 -55 - 5 50 46 - 5 22 36 - 6 49 24 - 4 24 2 - 92 0 0 - 6 23 10 3 55 45 49 311 -56 - 6 37 14 - 6 9 6 - 7 35 49 - 5 10 35 - 91 0 0 - 7 9 28 3 56 5 48 310 -57 - 7 23 31 - 6 55 25 - 8 22 2 - 5 56 58 - 90 0 0 - 7 55 33 3 56 24 46 310 -58 - 8 9 35 - 7 41 31 - 9 8 1 - 6 43 8 - 89 0 0 - 8 41 22 3 56 43 45 310 -59 - 8 55 24 - 8 27 21 - 9 53 44 - 7 29 4 - 88 0 0 - 9 26 55 3 57 1 44 310 -60 - 9 40 55 - 9 12 55 -10 39 9 - 8 14 44 - 87 0 0 -10 12 8 3 57 18 42 309 -61 -10 26 6 - 9 58 10 -11 24 15 - 9 0 6 - 86 0 0 -10 57 1 3 57 36 41 309 -62 -11 10 57 -10 43 5 -12 8 58 - 9 45 7 - 85 0 0 -11 41 31 3 57 52 40 309 -63 -11 55 25 -11 27 37 -12 53 18 -10 29 47 - 84 0 0 -12 25 37 3 58 8 39 308 -63 -12 39 29 -12 11 45 -13 37 13 -11 14 4 - 83 0 0 -13 9 17 3 58 24 37 308 -64 -13 23 7 -12 55 27 -14 20 42 -11 57 55 - 82 0 0 -13 52 30 3 58 39 36 308 -65 -14 6 18 -13 38 42 -15 3 43 -12 41 19 - 81 0 0 -14 35 14 3 58 53 35 308 -65 -14 48 59 -14 21 29 -15 46 15 -13 24 16 - 80 0 0 -15 17 28 3 59 7 34 307 -66 -15 31 11 -15 3 46 -16 28 16 -14 6 44 - 79 0 0 -15 59 12 3 59 20 32 307 -67 -16 12 52 -15 45 31 -17 9 46 -14 48 40 - 78 0 0 -16 40 23 3 59 33 31 307 -67 -16 54 0 -16 26 45 -17 50 43 -15 30 6 - 77 0 0 -17 21 1 3 59 45 30 306 -68 -17 34 36 -17 7 26 -18 31 7 -16 10 58 - 76 0 0 -18 1 5 3 59 57 29 306 -68 -18 14 37 -17 47 33 -19 10 56 -16 51 17 - 75 0 0 -18 40 34 4 0 8 27 306 -68 -18 54 3 -18 27 5 -19 50 9 -17 31 1 - 74 0 0 -19 19 27 4 0 19 26 305 -69 -19 32 53 -19 6 1 -20 28 47 -18 10 10 - 73 0 0 -19 57 44 4 0 29 25 305 -69 -20 11 7 -19 44 21 -21 6 49 -18 48 42 - 72 0 0 -20 35 24 4 0 39 24 304 -69 -20 48 44 -20 22 4 -21 44 13 -19 26 38 - 71 0 0 -21 12 27 4 0 48 23 304 -69 -21 25 43 -20 59 10 -22 20 59 -20 3 57 - 70 0 0 -21 48 51 4 0 56 22 304 -69 -22 2 5 -21 35 38 -22 57 7 -20 40 38 - 69 0 0 -22 24 37 4 1 4 21 303 -69 -22 37 48 -22 11 27 -23 32 37 -21 16 41 - 68 0 0 -22 59 45 4 1 12 19 303 -69 -23 12 52 -22 46 38 -24 7 28 -21 52 5 - 67 0 0 -23 34 14 4 1 19 18 302 -69 -23 47 18 -23 21 10 -24 41 40 -22 26 50 - 66 0 0 -24 8 3 4 1 26 17 302 -69 -24 21 4 -23 55 3 -25 15 13 -23 0 57 - 65 0 0 -24 41 14 4 1 32 16 302 -69 -24 54 11 -24 28 17 -25 48 7 -23 34 24 - 64 0 0 -25 13 45 4 1 38 15 301 -68 -25 26 39 -25 0 51 -26 20 22 -24 7 11 - 63 0 0 -25 45 37 4 1 43 14 301 -68 -25 58 28 -25 32 46 -26 51 57 -24 39 20 - 62 0 0 -26 16 49 4 1 48 13 300 -68 -26 29 37 -26 4 1 -27 22 52 -25 10 49 - 61 0 0 -26 47 22 4 1 52 12 300 -67 -27 0 7 -26 34 38 -27 53 9 -25 41 38 - 60 0 0 -27 17 16 4 1 56 11 299 -67 -27 29 57 -27 4 34 -28 22 46 -26 11 48 - 59 0 0 -27 46 30 4 2 0 10 299 -66 -27 59 9 -27 33 52 -28 51 45 -26 41 19 - 58 0 0 -28 15 6 4 2 3 9 298 -66 -28 27 41 -28 2 31 -29 20 4 -27 10 11 - 57 0 0 -28 43 2 4 2 6 8 298 -65 -28 55 34 -28 30 30 -29 47 45 -27 38 23 - 56 0 0 -29 10 20 4 2 9 7 297 -65 -29 22 49 -28 57 51 -30 14 47 -28 5 57 - 55 0 0 -29 37 0 4 2 11 6 297 -64 -29 49 26 -29 24 34 -30 41 11 -28 32 52 - 54 0 0 -30 3 1 4 2 13 5 296 -63 -30 15 24 -29 50 38 -31 6 56 -28 59 8 - 53 0 0 -30 28 24 4 2 14 4 296 -63 -30 40 44 -30 16 4 -31 32 4 -29 24 47 - 52 0 0 -30 53 9 4 2 15 3 295 -62 -31 5 27 -30 40 52 -31 56 35 -29 49 47 - 51 0 0 -31 17 17 4 2 16 2 295 -62 -31 29 32 -31 5 3 -32 20 28 -30 14 10 - 50 0 0 -31 40 48 4 2 17 1 294 -61 -31 53 0 -31 28 37 -32 43 44 -30 37 55 - 49 0 0 -32 3 42 4 2 17 0 294 -60 -32 15 51 -31 51 34 .. .. .. -31 1 4 Uncertainty in time = +/- 15 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 1385-00734-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 10 38.4949 DE: +20 01 11.986 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .042 ) * V mag [mag]: 11.4 * B mag [mag]: 12.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1285) Julietta approx. diameter [km]: 41 approx. diameter ["]: .022 distance from Earth [AU]: 2.52100 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 852 number of rejected observations: 47 time covered by the observations: 1933 Aug 21 - 2008 Mar 05 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.021, 109° remarks: * orbital elements for (1285) Julietta : Mean anomaly = 98.37565773 deg Arg. of pericenter = 76.03723153 deg Long. of node = 318.19932126 deg Inclination = 5.69500268 deg Eccentricity = 0.05220798 Semimajor axis = 2.99266015 AU Perihelion dist = 2.83641940 AU Mag: H = 10.83, G = 0.15 Epoch of elements : MJD 54555.15500000 TDT (2008 Mar 30.155) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 30 1285 Julietta 3h 43.3m UT 11.4 8 10 38.495 20 1 11.99TYC 1385-00734-1 12.2 15.9 41 7.3 2.521 0.678 -5.48 -121.0767 20.021 125.29 3.89 3.7220 -0.03934 -0.06650 2.73539 -1.56985 0.00531 -0.00116 2000 97.3942572008 325.00000 76.037232318.199321 5.6950030.05220798 2.9926602 2.836419410.6 5.00.15 RATE 1.9037850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.040 4 3.08 0.047 0 54553.5020080330_0734-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org