IOTA/IOTA-ES occultation update for (852) Wladilena / TYC 7817-00653-1 event on 2007 Aug 01, 04:05 UT Visible from Chile Summary ------- On 2007 Aug 01 UT, the 23 km diameter asteroid (852) Wladilena will occult a 11.4 mag star in the constellation Lupus for observers along a path across Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.3 mag (the magnitude of the asteroid) for at most 2.1 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: 38 * date and approx. time of event: 2007 Aug 01, 03:55 - 2007 Aug 01, 04:14 UT * midpoint of event [JD]: 2454313.67024167 * magnitude of target star: 11.4 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 2.1 * Moon: 94 % sunlit, 105° distance * Sun: 100° distance * rough path description: Chile The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 1.72 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .034", 155° ) * approx speed of asteroid's shadow [km/s]: 11.0783 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7817-00653-1 by 852 Wladilena on 2007 Aug 01 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 131 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 12 23 52 .. .. .. 132 0 0 12 4 36 3 55 37 1 135 79 11 55 48 12 13 25 11 25 32 12 43 43 133 0 0 11 5 56 3 55 37 3 135 78 10 57 7 11 14 45 10 26 48 11 45 6 134 0 0 10 6 52 3 55 38 4 135 76 9 58 2 10 15 42 9 27 41 10 46 6 135 0 0 9 7 29 3 55 39 5 135 75 8 58 38 9 16 19 8 28 15 9 46 46 136 0 0 8 7 49 3 55 41 7 136 74 7 58 58 8 16 40 7 28 33 8 47 7 137 0 0 7 7 55 3 55 42 8 136 72 6 59 4 7 16 46 6 28 38 7 47 15 138 0 0 6 7 51 3 55 45 10 136 71 5 59 0 6 16 42 5 28 33 6 47 11 139 0 0 5 7 40 3 55 47 11 136 69 4 58 49 5 16 31 4 28 22 5 47 0 140 0 0 4 7 25 3 55 50 12 136 68 3 58 34 4 16 16 3 28 9 4 46 44 141 0 0 3 7 10 3 55 53 14 136 67 2 58 20 3 16 1 2 27 55 3 46 28 142 0 0 2 6 58 3 55 57 15 136 65 1 58 8 2 15 48 1 27 46 2 46 13 143 0 0 1 6 53 3 56 1 17 136 64 0 58 4 1 15 42 0 27 44 1 46 5 144 0 0 0 6 58 3 56 5 18 136 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Data for the target star ------------------------ * name: TYC 7817-00653-1 * constellation : Lupus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 27 40.9750 DE: -43 10 45.564 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .021 ) * V mag [mag]: 11.4 * B mag [mag]: 11.9 * Apparent position with proper motion RA(deg): 217.0423735318 DE(deg): -43.2178077493 * Equation of equinoxes (radians) : 0.000033444601165 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (852) Wladilena approx. diameter [km]: 23 approx. diameter ["]: .023 distance from Earth [AU]: 1.35200 * orbital information: orbit source: Preston date of fit: 2007 Jul 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 676 number of rejected observations: 44 time covered by the observations: 1913 Sep 28 - 2007 Jun 22 1 sigma uncertainty ellipse (major, minor, PA): 0.037, 0.020, 148° remarks: * orbital elements for (852) Wladilena : Mean anomaly = 335.57575396 deg Arg. of pericenter = 282.28782319 deg Long. of node = 27.38888832 deg Inclination = 23.02785587 deg Eccentricity = 0.27399100 Semimajor axis = 2.36309442 AU Perihelion dist = 1.71562782 AU Mag: H = 9.95, G = 0.15 Epoch of elements : MJD 54313.17000000 TDT (2007 Aug 01.170) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 01 852 Wladilena 4h 5.1m UT 11.4 14 27 40.975-43 10 45.56TYC 7817-00653-1 11.9 13.3 23 2.1 1.352 3.641 -8.33 206.240 -43.177 120.31 18.12 4.0858 .02079 .10159 6.12057 -1.27953 0.00455 -0.00130 2000 334.7156682007 729.00000282.287823 27.388888 23.0278560.273991002.363094421.715627829.9 5 0.15 RATE 2.7132040 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.042 0.034 155.4 2.720 0.040 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 08, 16:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org