IOTA/IOTA-ES occultation update for (159) Aemilia / TYC 1305-01517-1 event on 2007 Jul 03, 21:47 UT Visible from Australia in twilight Summary ------- On 2007 Jul 03 UT, the 125 km diameter asteroid (159) Aemilia will occult a 11.7 mag star in the constellation Taurus for observers along a path across Australia in twilight. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.7 mag (the magnitude of the asteroid) for at most 2.7 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: 91 * date and approx. time of event: 2007 Jul 03, 21:45 - 2007 Jul 03, 21:49 UT * midpoint of event [JD]: 2454285.40795833 * magnitude of target star: 11.7 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 2.7 * Moon: 88 % sunlit, 121° distance * Sun: 18° distance * rough path description: Australia in twilight The occultation path -------------------- * approximate projected width [km]: 163 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .023", 89° ) * approx speed of asteroid's shadow [km/s]: 46.4387 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1305-01517-1 by 159 Aemilia on 2007 Jul 03 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 123 0 0 -40 35 55 21 45 42 0 64 -16 .. .. .. -39 47 10 .. .. .. .. .. .. 124 0 0 -40 13 34 21 45 43 1 63 -15 -41 2 56 -39 24 51 -41 54 0 .. .. .. 125 0 0 -39 51 10 21 45 43 2 63 -14 -40 40 30 -39 2 28 -41 31 32 .. .. .. 126 0 0 -39 28 43 21 45 43 3 62 -13 -40 18 1 -38 40 3 -41 9 1 .. .. .. 127 0 0 -39 6 14 21 45 43 4 61 -12 -39 55 30 -38 17 36 -40 46 28 .. .. .. 128 0 0 -38 43 43 21 45 43 4 61 -12 -39 32 57 -37 55 7 -40 23 52 .. .. .. 129 0 0 -38 21 11 21 45 43 5 60 -11 -39 10 22 -37 32 38 -40 1 15 .. .. .. 130 0 0 -37 58 38 21 45 43 6 60 -10 -38 47 47 -37 10 8 -39 38 37 -36 21 16 131 0 0 -37 36 6 21 45 44 7 59 -9 -38 25 12 -36 47 38 -39 15 59 -35 58 50 132 0 0 -37 13 34 21 45 44 8 58 -8 -38 2 38 -36 25 10 -38 53 21 -35 36 24 133 0 0 -36 51 4 21 45 45 9 58 -7 -37 40 4 -36 2 43 -38 30 44 -35 14 0 134 0 0 -36 28 36 21 45 45 10 57 -6 -37 17 33 -35 40 18 -38 8 9 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9 59 -27 0 32 -105 0 0 -28 53 4 21 49 7 14 302 25 -29 40 18 -28 6 23 -30 29 7 -27 19 20 -104 0 0 -29 12 16 21 49 8 13 302 24 -29 59 36 -28 25 31 -30 48 30 -27 38 22 -103 0 0 -29 31 44 21 49 8 12 301 23 -30 19 9 -28 44 53 -31 8 8 -27 57 39 -102 0 0 -29 51 25 21 49 9 12 301 22 -30 38 56 -29 4 29 -31 28 1 -28 17 11 -101 0 0 -30 11 20 21 49 10 11 300 21 -30 58 56 -29 24 19 -31 48 7 -28 36 56 -100 0 0 -30 31 28 21 49 10 10 299 21 -31 19 9 -29 44 23 -32 8 25 -28 56 55 - 99 0 0 -30 51 49 21 49 11 9 299 20 -31 39 35 -30 4 39 -32 28 57 -29 17 6 - 98 0 0 -31 12 22 21 49 11 8 298 19 -32 0 13 -30 25 7 -32 49 40 -29 37 29 - 97 0 0 -31 33 6 21 49 11 7 298 18 -32 21 2 -30 45 46 -33 10 35 -29 58 4 - 96 0 0 -31 54 2 21 49 12 6 297 17 -32 42 3 -31 6 36 -33 31 40 -30 18 49 - 95 0 0 -32 15 7 21 49 12 5 297 16 -33 3 13 -31 27 37 -33 52 56 .. .. .. - 94 0 0 -32 36 22 21 49 12 4 296 15 -33 24 33 -31 48 48 -34 14 21 .. .. .. - 93 0 0 -32 57 47 21 49 12 3 296 15 -33 46 2 -32 10 8 -34 35 55 .. .. .. - 92 0 0 -33 19 20 21 49 13 2 295 14 -34 7 40 -32 31 36 -34 57 37 .. .. .. - 91 0 0 -33 41 1 21 49 13 1 295 13 -34 29 25 -32 53 13 -35 19 28 .. .. .. - 90 0 0 -34 2 49 21 49 13 1 294 12 -34 51 18 .. .. .. .. .. .. .. .. .. Data for the target star ------------------------ * name: TYC 1305-01517-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 32 52.7529 DE: +19 26 21.839 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .022 ) * V mag [mag]: 11.7 * B mag [mag]: 13.9 * Apparent position with proper motion RA(deg): 83.3267371251 DE(deg): 19.4464767181 * Equation of equinoxes (radians) : 0.000028801613882 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (159) Aemilia approx. diameter [km]: 125 approx. diameter ["]: .046 distance from Earth [AU]: 3.74900 * orbital information: orbit source: Preston date of fit: 2007 Jun 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 788 number of rejected observations: 117 time covered by the observations: 1904 Jan 11 - 2007 Feb 17 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.007, 83° remarks: * orbital elements for (159) Aemilia : Mean anomaly = 333.69104842 deg Arg. of pericenter = 335.42077648 deg Long. of node = 134.32129860 deg Inclination = 6.12745277 deg Eccentricity = 0.11088823 Semimajor axis = 3.10125676 AU Perihelion dist = 2.75736388 AU Mag: H = 8.18, G = 0.15 Epoch of elements : MJD 54284.90800000 TDT (2007 Jul 03.908) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 03 159 Aemilia 21h 47.5m UT 11.7 5 32 52.753 19 26 21.84TYC 1305-01517-1 13.9 13.7 125 2.7 3.749 4.339 3.73 -165.182 19.438 -145.80 22.93 21.7910 .03929 -.64055 26.16279 1.59370 -0.00166 -0.00043 2000 332.8053162007 629.00000335.420776134.321299 6.1274530.110888233.101256762.757363888.125 0.15 RATE 1.8046690 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.031 0.023 88.8 1.510 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 05, 17:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org