IOTA/IOTA-ES occultation update for (4) Vesta / TYC 0043-00896-1 event on 2008 Jul 04, 22:25 UT Visible from S Indian Ocean Summary ------- On 2008 Jul 04 UT, the 547 km diameter asteroid (4) Vesta will occult a 11.8 mag star in the constellation Cetus for observers along a path across S Indian Ocean. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.0 mag to 8.0 mag (the magnitude of the asteroid) for at most 21.1 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: 100 * date and approx. time of event: 2008 Jul 04, 22:24 - 2008 Jul 04, 22:25 UT * midpoint of event [JD]: 2454652.43464583 * magnitude of target star: 11.8 * magnitude drop [mag]: 0.0 * estimated maximum duration [s]: 21.1 * Moon: 4 % sunlit, 96° distance * Sun: 72° distance * rough path description: S Indian Ocean The occultation path -------------------- * approximate projected width [km]: 1294 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .021", 87° ) * approx speed of asteroid's shadow [km/s]: 25.9143 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0043-00896-1 by 4 Vesta on 2008 Jul 4 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 71 2 40 -78 0 0 22 24 11 0 61 -31 119 14 40 ... .. .. 125 41 6 ... .. .. 78 52 24 -77 0 0 22 24 11 2 53 -30 122 12 0 ... .. .. 128 13 3 ... .. .. Latitude Latitude Latitude Latitude 79 0 0 -76 58 55 22 24 11 2 53 -30 .. .. .. -70 51 37 .. .. .. -70 6 12 80 0 0 -76 50 17 22 24 11 2 52 -30 .. .. .. -70 41 44 .. .. .. -69 56 12 81 0 0 -76 41 26 22 24 12 3 51 -30 .. .. .. -70 31 39 .. .. .. -69 46 0 82 0 0 -76 32 21 22 24 12 3 50 -30 .. .. .. -70 21 21 .. .. .. -69 35 35 83 0 0 -76 23 2 22 24 12 3 49 -29 .. .. .. -70 10 50 .. .. .. -69 24 57 84 0 0 -76 13 29 22 24 12 4 48 -29 .. .. .. -70 0 6 .. .. .. -69 14 6 85 0 0 -76 3 42 22 24 12 4 47 -29 .. .. .. -69 49 9 .. .. .. -69 3 3 86 0 0 -75 53 40 22 24 12 4 46 -29 .. .. .. -69 37 58 .. .. .. -68 51 46 87 0 0 -75 43 25 22 24 13 4 45 -29 .. .. .. -69 26 35 .. .. .. -68 40 16 88 0 0 -75 32 54 22 24 13 5 44 -29 .. .. .. -69 14 58 .. .. .. -68 28 33 89 0 0 -75 22 9 22 24 13 5 43 -28 .. .. .. -69 3 8 .. .. .. -68 16 37 90 0 0 -75 11 9 22 24 13 5 43 -28 .. .. .. -68 51 5 .. .. .. -68 4 28 91 0 0 -74 59 53 22 24 14 6 42 -28 .. .. .. -68 38 49 .. .. .. -67 52 6 92 0 0 -74 48 23 22 24 14 6 41 -28 .. .. .. -68 26 20 .. .. .. -67 39 31 93 0 0 -74 36 38 22 24 14 6 40 -28 .. .. .. -68 13 37 .. .. .. -67 26 43 94 0 0 -74 24 37 22 24 15 7 39 -27 .. .. .. -68 0 41 .. .. .. -67 13 43 95 0 0 -74 12 21 22 24 15 7 38 -27 .. .. .. -67 47 33 .. .. .. -67 0 29 96 0 0 -73 59 49 22 24 16 7 37 -27 .. .. .. -67 34 11 .. .. .. -66 47 3 97 0 0 -73 47 2 22 24 16 8 36 -27 .. .. .. -67 20 37 .. .. .. -66 33 24 98 0 0 -73 34 0 22 24 17 8 35 -27 .. .. .. -67 6 50 .. .. .. -66 19 33 99 0 0 -73 20 42 22 24 17 8 34 -26 -83 12 19 -66 52 50 .. .. .. -66 5 29 100 0 0 -73 7 9 22 24 18 9 33 -26 -83 1 15 -66 38 38 .. .. .. -65 51 13 101 0 0 -72 53 21 22 24 18 9 32 -26 -82 49 45 -66 24 13 .. .. .. -65 36 45 102 0 0 -72 39 17 22 24 19 9 31 -26 -82 37 48 -66 9 36 .. .. .. -65 22 5 103 0 0 -72 24 59 22 24 20 10 30 -25 -82 25 25 -65 54 47 .. .. .. -65 7 14 104 0 0 -72 10 25 22 24 20 10 29 -25 -82 12 34 -65 39 47 .. .. .. -64 52 11 105 0 0 -71 55 36 22 24 21 10 28 -25 -81 59 16 -65 24 35 .. .. .. -64 36 56 106 0 0 -71 40 33 22 24 22 11 27 -24 -81 45 30 -65 9 11 .. .. .. -64 21 31 107 0 0 -71 25 15 22 24 23 11 26 -24 -81 31 16 -64 53 36 .. .. .. -64 5 54 108 0 0 -71 9 43 22 24 23 12 25 -24 -81 16 33 -64 37 51 -83 45 20 -63 50 8 109 0 0 -70 53 57 22 24 24 12 24 -23 -81 1 22 -64 21 55 -83 30 32 -63 34 10 110 0 0 -70 37 58 22 24 25 12 23 -23 -80 45 43 -64 5 48 -83 15 5 -63 18 3 111 0 0 -70 21 45 22 24 26 13 22 -23 -80 29 36 -63 49 32 -82 59 1 -63 1 47 112 0 0 -70 5 18 22 24 27 13 21 -22 -80 13 1 -63 33 6 -82 42 19 -62 45 21 113 0 0 -69 48 39 22 24 28 13 20 -22 -79 55 59 -63 16 31 -82 24 59 -62 28 46 114 0 0 -69 31 48 22 24 29 14 19 -22 -79 38 31 -62 59 47 -82 7 4 -62 12 2 115 0 0 -69 14 44 22 24 30 14 18 -21 -79 20 36 -62 42 54 -81 48 32 -61 55 11 116 0 0 -68 57 29 22 24 32 15 17 -21 -79 2 15 -62 25 54 -81 29 26 -61 38 11 117 0 0 -68 40 3 22 24 33 15 16 -20 -78 43 30 -62 8 45 -81 9 47 -61 21 4 118 0 0 -68 22 26 22 24 34 15 15 -20 -78 24 21 -61 51 29 -80 49 37 -61 3 50 119 0 0 -68 4 40 22 24 35 16 14 -19 -78 4 50 -61 34 7 -80 28 56 -60 46 30 120 0 0 -67 46 43 22 24 37 16 13 -19 -77 44 56 -61 16 38 -80 7 47 -60 29 4 121 0 0 -67 28 38 22 24 38 16 12 -19 -77 24 42 -60 59 3 -79 46 11 -60 11 31 122 0 0 -67 10 23 22 24 40 17 11 -18 -77 4 9 -60 41 23 -79 24 10 -59 53 54 123 0 0 -66 52 1 22 24 41 17 10 -18 -76 43 17 -60 23 38 -79 1 46 -59 36 12 124 0 0 -66 33 32 22 24 43 18 9 -17 -76 22 8 -60 5 48 -78 39 1 -59 18 26 125 0 0 -66 14 56 22 24 44 18 8 -17 -76 0 44 -59 47 55 -78 15 58 -59 0 37 126 0 0 -65 56 14 22 24 46 18 7 -16 -75 39 5 -59 29 58 -77 52 37 -58 42 44 127 0 0 -65 37 26 22 24 48 19 6 -16 -75 17 13 -59 11 58 -77 29 1 -58 24 49 128 0 0 -65 18 34 22 24 49 19 5 -15 -74 55 9 -58 53 57 -77 5 12 -58 6 51 129 0 0 -64 59 37 22 24 51 19 3 -15 -74 32 55 -58 35 53 -76 41 12 -57 48 53 130 0 0 -64 40 37 22 24 53 20 2 -14 -74 10 32 -58 17 48 -76 17 2 -57 30 53 131 0 0 -64 21 35 22 24 55 20 1 -14 -73 48 1 -57 59 43 -75 52 45 -57 12 53 132 0 0 -64 2 30 22 24 57 20 0 -13 -73 25 24 -57 41 38 -75 28 21 -56 54 53 133 0 0 -63 43 24 22 24 59 21 359 -13 -73 2 42 -57 23 33 -75 3 53 -56 36 54 134 0 0 -63 24 17 22 25 1 21 358 -12 -72 39 56 -57 5 29 -74 39 22 -56 18 56 135 0 0 -63 5 11 22 25 3 21 357 -12 -72 17 8 -56 47 27 -74 14 50 -56 1 0 136 0 0 -62 46 5 22 25 5 22 356 -11 -71 54 19 -56 29 28 -73 50 18 -55 43 7 137 0 0 -62 27 1 22 25 7 22 355 -10 -71 31 29 -56 11 31 -73 25 48 -55 25 17 138 0 0 -62 7 59 22 25 9 22 354 -10 -71 8 42 -55 53 38 -73 1 21 -55 7 30 139 0 0 -61 49 0 22 25 12 22 353 -9 -70 45 56 -55 35 49 -72 36 59 -54 49 48 140 0 0 -61 30 5 22 25 14 23 352 -9 -70 23 15 -55 18 5 -72 12 42 -54 32 10 141 0 0 -61 11 14 22 25 16 23 350 -8 -70 0 38 -55 0 26 -71 48 32 -54 14 38 142 0 0 -60 52 28 22 25 18 23 349 -8 -69 38 7 -54 42 53 -71 24 29 -53 57 12 143 0 0 -60 33 48 22 25 21 23 348 -7 -69 15 43 -54 25 27 -71 0 36 -53 39 52 144 0 0 -60 15 14 22 25 23 24 347 -6 -68 53 26 -54 8 7 -70 36 54 -53 22 40 145 0 0 -59 56 48 22 25 26 24 346 -6 -68 31 19 -53 50 55 -70 13 22 -53 5 35 146 0 0 -59 38 30 22 25 28 24 345 -5 -68 9 22 -53 33 52 -69 50 3 -52 48 38 147 0 0 -59 20 20 22 25 31 24 344 -5 -67 47 36 -53 16 57 -69 26 57 -52 31 51 148 0 0 -59 2 19 22 25 33 24 343 -4 -67 26 1 -53 0 11 -69 4 4 -52 15 12 149 0 0 -58 44 29 22 25 36 24 341 -3 -67 4 39 -52 43 35 -68 41 27 -51 58 44 150 0 0 -58 26 48 22 25 38 24 340 -3 -66 43 30 -52 27 10 -68 19 6 -51 42 26 151 0 0 -58 9 19 22 25 41 24 339 -2 -66 22 36 -52 10 56 -67 57 0 -51 26 19 152 0 0 -57 52 2 22 25 43 25 338 -2 -66 1 57 -51 54 53 -67 35 12 -51 10 23 153 0 0 -57 34 57 22 25 46 25 337 -1 -65 41 33 -51 39 2 -67 13 43 -50 54 39 154 0 0 -57 18 5 22 25 49 25 336 0 -65 21 26 -51 23 24 -66 52 31 -50 39 8 Uncertainty in time = +/- 2 secs [Prediction of 2008 May 22.0] Data for the target star ------------------------ * name: TYC 0043-00896-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 06 48.9707 DE: +05 38 28.920 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 11.8 * B mag [mag]: 12.1 * Apparent position with proper motion RA(deg): 31.8165274480 DE(deg): 5.6836842264 * Equation of equinoxes (radians) : 0.000051829449668 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4) Vesta approx. diameter [km]: 547 approx. diameter ["]: .296 distance from Earth [AU]: 2.54900 * orbital information: orbit source: Preston date of fit: 2008 May 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 5669 number of rejected observations: 781 time covered by the observations: 1903 Oct 31 - 2007 Aug 08 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.006, 68° remarks: * orbital elements for (4) Vesta : Mean anomaly = 104.65859471 deg Arg. of pericenter = 149.83247611 deg Long. of node = 103.91453190 deg Inclination = 7.13520372 deg Eccentricity = 0.08915429 Semimajor axis = 2.36107113 AU Perihelion dist = 2.15057151 AU Mag: H = 3.15, G = 0.32 Epoch of elements : MJD 54651.93500000 TDT (2008 Jul 04.935) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 4 4 Vesta 22h 25.9m UT 11.8 2 6 48.971 5 38 28.92TYC 0043-00896-1 12.1 8.0 547 21.1 2.549 3.280 12.23 131.9325 5.637 -155.33 22.78 22.4315 0.22088 -0.87886 14.19056 3.54545 -0.00479 -0.00195 2000 104.1329152008 7 3.00000149.832476103.914532 7.1352040.08915429 2.3610711 2.1505715 3.2 5.00.32 RATE 2.7166920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.022 0.021 87 1.07 0.021 0 54608.5020080704_0896-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 26, 16:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org