IOTA/IOTA-ES occultation update for (611) Valeria / TYC 5178-00198-1 event on 2008 Jul 05, 11:42 UT Visible from SE Australia Summary ------- On 2008 Jul 05 UT, the 57 km diameter asteroid (611) Valeria will occult a 12.5 mag star in the constellation Aquarius for observers along a path across SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 14.3 mag (the magnitude of the asteroid) for at most 5.8 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: 72 * date and approx. time of event: 2008 Jul 05, 11:33 - 2008 Jul 05, 11:52 UT * magnitude of target star: 12.5 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 5.8 * Moon: 8 % sunlit, 163° distance * Sun: 145° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 66 * 1 sigma uncertainty interval [path widths]: +/- 0.81 * 1 sigma uncertainty interval [seconds]: +/- 6.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .027", 85° ) * approx speed of asteroid's shadow [km/s]: 9.7538 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5178-00198-1 by 611 Valeria on 2008 Jul 5 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 121 0 0 -33 59 2 11 52 16 1 90 -35 -33 41 12 -34 16 57 .. .. .. -34 46 4 122 0 0 -33 59 14 11 52 15 2 89 -36 -33 41 23 -34 17 8 -33 12 35 -34 46 15 123 0 0 -33 59 21 11 52 15 2 89 -37 -33 41 30 -34 17 16 -33 12 42 -34 46 23 124 0 0 -33 59 25 11 52 15 3 88 -37 -33 41 34 -34 17 19 -33 12 46 -34 46 26 125 0 0 -33 59 25 11 52 14 4 88 -38 -33 41 34 -34 17 19 -33 12 46 -34 46 27 126 0 0 -33 59 21 11 52 13 5 87 -39 -33 41 30 -34 17 16 -33 12 42 -34 46 23 127 0 0 -33 59 14 11 52 12 6 87 -40 -33 41 23 -34 17 8 -33 12 35 -34 46 15 128 0 0 -33 59 3 11 52 11 6 86 -41 -33 41 12 -34 16 57 -33 12 23 -34 46 4 129 0 0 -33 58 48 11 52 10 7 85 -42 -33 40 57 -34 16 42 -33 12 8 -34 45 49 130 0 0 -33 58 29 11 52 8 8 85 -42 -33 40 38 -34 16 23 -33 11 49 -34 45 31 131 0 0 -33 58 7 11 52 7 9 84 -43 -33 40 15 -34 16 1 -33 11 27 -34 45 8 132 0 0 -33 57 40 11 52 5 10 84 -44 -33 39 49 -34 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0 0 -27 21 59 11 34 37 25 283 -11 -27 4 7 -27 39 54 -26 35 18 -28 9 2 - 82 0 0 -27 20 0 11 34 32 24 283 -10 -27 2 9 -27 37 55 -26 33 19 -28 7 3 - 81 0 0 -27 18 5 11 34 27 23 282 -9 -27 0 13 -27 36 0 -26 31 24 -28 5 8 - 80 0 0 -27 16 13 11 34 23 22 282 -8 -26 58 21 -27 34 7 -26 29 32 -28 3 16 - 79 0 0 -27 14 24 11 34 19 21 281 -7 -26 56 32 -27 32 19 -26 27 43 -28 1 27 - 78 0 0 -27 12 38 11 34 15 20 281 -6 -26 54 47 -27 30 33 -26 25 57 -27 59 41 - 77 0 0 -27 10 56 11 34 11 20 280 -6 -26 53 5 -27 28 51 -26 24 15 -27 57 59 - 76 0 0 -27 9 18 11 34 7 19 280 -5 -26 51 26 -27 27 12 -26 22 37 -27 56 20 - 75 0 0 -27 7 42 11 34 3 18 279 -4 -26 49 51 -27 25 37 -26 21 2 -27 54 45 - 74 0 0 -27 6 11 11 34 0 17 279 -3 -26 48 19 -27 24 5 -26 19 30 -27 53 13 - 73 0 0 -27 4 43 11 33 57 16 278 -2 -26 46 51 -27 22 37 -26 18 2 -27 51 45 - 72 0 0 -27 3 18 11 33 53 15 278 -2 -26 45 27 -27 21 13 -26 16 37 -27 50 21 - 71 0 0 -27 1 57 11 33 50 14 277 -1 -26 44 6 -27 19 52 -26 15 16 -27 49 0 Uncertainty in time = +/- 6 secs [Prediction of 2008 Jun 19.0] Data for the target star ------------------------ * name: TYC 5178-00198-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 48 39.1061 DE: -00 17 25.294 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .021 ) * V mag [mag]: 12.5 * B mag [mag]: 13.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (611) Valeria approx. diameter [km]: 57 approx. diameter ["]: .033 distance from Earth [AU]: 2.34900 * orbital information: orbit source: Preston date of fit: 2008 Jun 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 789 number of rejected observations: 63 time covered by the observations: 1901 Nov 02 - 2008 Jun 10 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.016, 81° remarks: * orbital elements for (611) Valeria : Mean anomaly = 228.77588395 deg Arg. of pericenter = 255.35867527 deg Long. of node = 189.53932642 deg Inclination = 13.42540771 deg Eccentricity = 0.11798587 Semimajor axis = 2.98320615 AU Perihelion dist = 2.63122997 AU Mag: H = 9.23, G = 0.15 Epoch of elements : MJD 54652.48800000 TDT (2008 Jul 05.488) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 5 611 Valeria 11h 42.9m UT 12.5 20 48 39.106- 0 17 25.29TYC 5178-00198-1 13.5 14.3 57 5.8 2.349 -1.373 -1.29 -147.3936 -0.291 5.46 22.72 11.7142 0.03169 -0.50202 -5.49468 -0.34232 -0.00238 -0.00217 2000 228.2999692008 7 3.00000255.358675189.539326 13.4254080.11798587 2.9832062 2.6312300 9.2 5.00.15 RATE 1.9128420 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.027 85 1.81 0.027 0 54636.5020080705_0198-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 19, 01:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org