IOTA/IOTA-ES occultation update for (585) Bilkis / 2UCAC 27871843 event on 2009 Jul 08, 09:03 UT Visible from E Australia Summary ------- On 2009 Jul 08 UT, the 58 km diameter asteroid (585) Bilkis will occult a 12.7 mag star in the constellation Serpens for observers along a path across E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 14.1 mag (the magnitude of the asteroid) for at most 6.3 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 43 * date and approx. time of event: 2009 Jul 08, 08:52 - 2009 Jul 08, 09:14 UT * magnitude of target star: 12.7 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 6.3 * Moon: 99 % sunlit, 35° distance * Sun: 154° distance * rough path description: E Australia The occultation path -------------------- * approximate projected width [km]: 60 * 1 sigma uncertainty interval [path widths]: +/- 1.52 * 1 sigma uncertainty interval [seconds]: +/- 9.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .076 +/- .074) * 1 sigma uncertainty ellipse (major, minor, PA): ( .076", .074", 90° ) * approx speed of asteroid's shadow [km/s]: 9.1958 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 27871843 by 585 Bilkis on 2009 Jul 8 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 -26 54 33 9 14 27 16 95 0 -26 38 12 -27 10 56 -25 48 34 -28 0 51 122 0 0 -27 2 42 9 14 24 17 94 -1 -26 46 21 -27 19 4 -25 56 45 -28 8 57 123 0 0 -27 10 36 9 14 21 18 94 -2 -26 54 16 -27 26 58 -26 4 42 -28 16 50 124 0 0 -27 18 18 9 14 17 19 93 -3 -27 1 58 -27 34 39 -26 12 25 -28 24 29 125 0 0 -27 25 45 9 14 14 20 93 -4 -27 9 26 -27 42 6 -26 19 55 -28 31 54 126 0 0 -27 32 59 9 14 10 21 92 -5 -27 16 40 -27 49 19 -26 27 11 -28 39 6 127 0 0 -27 39 59 9 14 6 22 92 -5 -27 23 41 -27 56 19 -26 34 13 -28 46 4 128 0 0 -27 46 46 9 14 2 22 91 -6 -27 30 28 -28 3 5 -26 41 2 -28 52 49 129 0 0 -27 53 19 9 13 58 23 91 -7 -27 37 1 -28 9 38 -26 47 36 -28 59 20 130 0 0 -27 59 38 9 13 53 24 90 -8 -27 43 21 -28 15 56 -26 53 57 -29 5 38 131 0 0 -28 5 43 9 13 49 25 90 -9 -27 49 27 -28 22 1 -27 0 4 -29 11 41 132 0 0 -28 11 35 9 13 44 26 89 -10 -27 55 19 -28 27 52 -27 5 57 -29 17 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- 3 26 11 - 5 39 47 - 67 0 0 - 4 20 26 8 52 32 2 259 -25 - 4 3 55 - 4 36 58 - 3 13 49 - 5 27 21 - 66 0 0 - 4 8 13 8 52 31 1 259 -24 - 3 51 42 - 4 24 44 - 3 1 39 - 5 15 6 Uncertainty in time = +/- 10 secs Prediction of 2009 Jun 30.0 Data for the target star ------------------------ * name: 2UCAC 27871843 * constellation : Serpens * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 33 02.1836 DE: -11 13 56.862 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .073, .073 ) * V mag [mag]: 12.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (585) Bilkis approx. diameter [km]: 58 approx. diameter ["]: .049 distance from Earth [AU]: 1.62100 * orbital information: orbit source: Preston date of fit: 2009 Jun 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1041 number of rejected observations: 80 time covered by the observations: 1906 Feb 16 - 2009 Jun 25 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.014, 91° remarks: * orbital elements for (585) Bilkis : Mean anomaly = 110.90909552 deg Arg. of pericenter = 327.94148508 deg Long. of node = 180.36140251 deg Inclination = 7.55701651 deg Eccentricity = 0.12909874 Semimajor axis = 2.43051495 AU Perihelion dist = 2.11673854 AU Mag: H = 10.31, G = 0.15 Epoch of elements : MJD 55020.37800000 TDT (2009 Jul 08.378) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 8 585 Bilkis 9h 3.7m UT 12.7 17 33 2.184-11 13 56.862UCAC 27871843 0.0 14.1 58 6.3 1.621 -1.883 -4.93 -159.1283 -11.231 45.34 22.44 9.0622 0.04279 -0.24059 -5.11020 -0.90875 0.00207 -0.00115 2000 110.8107752009 7 8.00000327.941485180.361403 7.5570170.12909874 2.4305150 2.116738510.4 5.00.15 RATE 2.6010970 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.076 0.074 90 2.52 0.075 0 55012.0020090708_871843 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Jun 30, 15:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org