IOTA/IOTA-ES occultation update for (1763) Williams / HIP 2648 event on 2008 Oct 12, 23:39 UT Visible from Arabia, Africa, Brazil, Argentina Summary ------- On 2008 Oct 12 UT, the 10 km diameter asteroid (1763) Williams will occult a 8.7 mag star in the constellation Pisces for observers along a path across Arabia, Africa, Brazil, Argentina. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 14.0 mag (the magnitude of the asteroid) for at most 1.7 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: . The event at a glimpse ---------------------- * Rank: 25 * date and approx. time of event: 2008 Oct 12, 23:21 - 2008 Oct 12, 23:57 UT * magnitude of target star: 8.7 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 1.7 * Moon: 96 % sunlit, 17° distance * Sun: 169° distance * rough path description: Arabia, Africa, Brazil, Argentina The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 2.66 * 1 sigma uncertainty interval [seconds]: +/- 6.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .042", 70° ) * approx speed of asteroid's shadow [km/s]: 5.8290 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 2648 by 1763 Williams on 2008 Oct 12 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 - 87 0 0 -31 51 41 23 57 21 6 70 -1 -31 48 46 -31 54 35 -31 33 18 -32 10 5 - 86 0 0 -31 34 24 23 57 19 7 70 -2 -31 31 29 -31 37 19 -31 15 59 -31 52 51 - 85 0 0 -31 16 45 23 57 17 8 69 -3 -31 13 50 -31 19 40 -30 58 17 -31 35 14 - 84 0 0 -30 58 42 23 57 14 9 69 -3 -30 55 46 -31 1 38 -30 40 12 -31 17 13 - 83 0 0 -30 40 16 23 57 11 10 68 -4 -30 37 20 -30 43 12 -30 21 44 -30 58 50 - 82 0 0 -30 21 27 23 57 8 10 68 -5 -30 18 31 -30 24 24 -30 2 53 -30 40 3 - 81 0 0 -30 2 16 23 57 5 11 67 -6 -29 59 19 -30 5 13 -29 43 39 -30 20 54 - 80 0 0 -29 42 42 23 57 1 12 67 -7 -29 39 44 -29 45 39 -29 24 2 -30 1 22 - 79 0 0 -29 22 45 23 56 57 13 66 -8 -29 19 48 -29 25 43 -29 4 4 -29 41 28 - 78 0 0 -29 2 26 23 56 53 14 66 -9 -28 59 28 -29 5 24 -28 43 43 -29 21 11 - 77 0 0 -28 41 46 23 56 49 15 65 -10 -28 38 47 -28 44 44 -28 23 0 -29 0 33 - 76 0 0 -28 20 43 23 56 44 16 65 -11 -28 17 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16 17 50 16 38 13 16 3 0 78 0 0 16 12 8 23 21 55 11 281 -19 16 14 56 16 9 21 16 29 45 15 54 30 79 0 0 16 3 12 23 21 52 10 281 -19 16 5 59 16 0 24 16 20 50 15 45 32 80 0 0 15 53 46 23 21 48 9 281 -18 15 56 34 15 50 59 16 11 26 15 36 5 81 0 0 15 43 53 23 21 46 8 282 -17 15 46 41 15 41 5 16 1 35 15 26 10 82 0 0 15 33 31 23 21 43 7 282 -16 15 36 19 15 30 43 15 51 14 15 15 47 83 0 0 15 22 40 23 21 41 6 282 -15 15 25 29 15 19 52 15 40 25 15 4 54 84 0 0 15 11 21 23 21 39 6 282 -14 15 14 10 15 8 32 15 29 8 14 53 34 85 0 0 14 59 33 23 21 37 5 283 -13 15 2 22 14 56 44 15 17 22 14 41 44 86 0 0 14 47 16 23 21 36 4 283 -12 14 50 6 14 44 27 15 5 7 14 29 25 87 0 0 14 34 31 23 21 35 3 283 -11 14 37 20 14 31 41 14 52 23 14 16 37 88 0 0 14 21 16 23 21 34 2 283 -10 14 24 6 14 18 26 14 39 10 14 3 20 89 0 0 14 7 32 23 21 34 1 284 -9 14 10 22 14 4 41 14 25 28 13 49 34 Uncertainty in time = +/- 6 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: HIP 2648 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 33 34.7458 DE: +13 13 14.213 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .025, .017 ) * V mag [mag]: 8.7 * B mag [mag]: 9.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1763) Williams approx. diameter [km]: 10 approx. diameter ["]: .016 distance from Earth [AU]: 0.83900 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 831 number of rejected observations: 19 time covered by the observations: 1953 Oct 13 - 2008 Sep 30 1 sigma uncertainty ellipse (major, minor, PA): 0.055, 0.039, 66° remarks: * orbital elements for (1763) Williams : Mean anomaly = 29.18372607 deg Arg. of pericenter = 28.52985861 deg Long. of node = 304.63528754 deg Inclination = 4.23834955 deg Eccentricity = 0.20380297 Semimajor axis = 2.18853349 AU Perihelion dist = 1.74250387 AU Mag: H = 12.75, G = 0.15 Epoch of elements : MJD 54751.98600000 TDT (2008 Oct 12.986) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 12 1763 Williams 23h 39.5m UT 8.7 0 33 34.746 13 13 14.21HIP 2648 9.9 14.0 10 1.7 0.839 -2.150 -14.25 -8.3954 13.224 -178.31 -7.83 23.6585 0.07231 -0.15978 -2.99625 -1.35896 0.00088 -0.00046 2000 28.57914620081011.00000 28.529859304.635288 4.2383500.20380297 2.1885335 1.742503912.6 5.00.15 RATE 3.0442080 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.042 70 3.66 0.044 0 54740.5020081012___2648 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org