IOTA/IOTA-ES occultation update for (683) Lanzia / UCAC2 29373639 event on 2008 May 17, 20:59 UT Visible from W Australia Summary ------- On 2008 May 17 UT, the 83 km diameter asteroid (683) Lanzia will occult a 11.7 mag star in the constellation Aquila for observers along a path across W Australia. 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 7.7 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: 72 * date and approx. time of event: 2008 May 17, 20:49 - 2008 May 17, 21:02 UT * midpoint of event [JD]: 2454604.37437917 * magnitude of target star: 11.7 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 7.7 * Moon: 95 % sunlit, 96° distance * Sun: 109° distance * rough path description: W Australia The occultation path -------------------- * approximate projected width [km]: 84 * 1 sigma uncertainty interval [path widths]: +/- 0.81 * 1 sigma uncertainty interval [seconds]: +/- 6.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .032", 80° ) * approx speed of asteroid's shadow [km/s]: 10.7172 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 29373639 by 683 Lanzia on 2008 May 17 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 Latitude Latitude Latitude Latitude 130 0 0 7 30 27 21 2 14 70 224 -1 6 14 12 8 45 44 4 8 28 10 45 48 129 0 0 4 16 3 21 1 40 73 228 -3 2 56 45 5 34 19 0 45 52 7 39 3 128 0 0 0 52 25 21 1 4 76 235 -5 - 0 29 55 2 13 39 - 2 45 53 4 23 2 127 0 0 - 2 39 36 21 0 26 78 245 -7 - 4 4 51 - 1 15 32 - 6 25 41 0 58 21 126 0 0 - 6 18 44 20 59 47 81 263 -10 - 7 46 40 - 4 52 1 -10 11 57 - 2 33 56 125 0 0 -10 3 13 20 59 6 81 287 -12 -11 33 30 - 8 34 11 -14 2 39 - 6 12 23 124 0 0 -13 50 54 20 58 25 80 312 -14 -15 23 5 -12 19 58 -17 55 17 - 9 55 7 123 0 0 -17 39 18 20 57 45 78 330 -16 -19 12 49 -16 7 1 -21 47 8 -13 39 54 122 0 0 -21 25 45 20 57 5 75 341 -18 -22 59 59 -19 52 42 -25 35 21 -17 24 16 121 0 0 -25 7 40 20 56 26 72 348 -20 -26 41 58 -23 34 29 -29 17 19 -21 5 41 120 0 0 -28 42 40 20 55 49 69 353 -22 -30 16 25 -27 9 57 -32 50 44 -24 41 46 119 0 0 -32 8 48 20 55 15 65 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Uncertainty in time = +/- 6 secs [Prediction of 2008 Apr 13.0] Data for the target star ------------------------ * name: UCAC2 29373639 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 29 19.6198 DE: -07 24 33.535 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .029 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 307.4484198050 DE(deg): -7.3825398291 * Equation of equinoxes (radians) : 0.000039516326509 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (683) Lanzia approx. diameter [km]: 83 approx. diameter ["]: .043 distance from Earth [AU]: 2.68200 * orbital information: orbit source: Preston date of fit: 2008 Feb 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 716 number of rejected observations: 51 time covered by the observations: 1913 Apr 03 - 2007 Sep 09 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 62° remarks: * orbital elements for (683) Lanzia : Mean anomaly = 100.74098300 deg Arg. of pericenter = 284.96203185 deg Long. of node = 259.85195023 deg Inclination = 18.51829594 deg Eccentricity = 0.05196981 Semimajor axis = 3.12086723 AU Perihelion dist = 2.95867634 AU Mag: H = 8.60, G = 0.15 Epoch of elements : MJD 54603.87400000 TDT (2008 May 17.874) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 17 683 Lanzia 20h 59.1m UT 11.7 20 29 19.620- 7 24 33.54UCAC2 29373639 0.0 13.7 83 7.7 2.682 0.419 18.83 116.6279 -7.415 -135.67 19.56 20.9851 0.14140 -0.04675 1.90324 5.74190 -0.00509 -0.00167 2000 100.0484342008 514.00000284.962032259.851950 18.5182960.05196981 3.1208672 2.9586764 8.1 5.00.15 RATE 1.7876850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.032 80 1.81 0.035 0 54569.5020080517_373639 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 13, 03:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org