IOTA/IOTA-ES occultation update for (2802) Weisell / TYC 4684-01612-1 event on 2008 Oct 12, 18:54 UT Visible from New Guinea Summary ------- On 2008 Oct 12 UT, the 21 km diameter asteroid (2802) Weisell will occult a 10.0 mag star in the constellation Cetus for observers along a path across New Guinea. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.1 mag to 16.1 mag (the magnitude of the asteroid) for at most 1.4 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: 17 * date and approx. time of event: 2008 Oct 12, 18:48 - 2008 Oct 12, 19:01 UT * magnitude of target star: 10.0 * magnitude drop [mag]: 6.1 * estimated maximum duration [s]: 1.4 * Moon: 94 % sunlit, 29° distance * Sun: 167° distance * rough path description: New Guinea The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 3.90 * 1 sigma uncertainty interval [seconds]: +/- 8.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .069 +/- .049) * 1 sigma uncertainty ellipse (major, minor, PA): ( .071", .046", 72° ) * approx speed of asteroid's shadow [km/s]: 14.8917 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4684-01612-1 by 2802 Weisell 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 - 8 0 0 -52 57 32 19 1 3 9 86 0 -52 51 8 -53 3 57 -52 1 24 -53 54 9 - 7 0 0 -52 57 59 19 1 2 9 85 -1 -52 51 35 -53 4 24 -52 1 51 -53 54 36 - 6 0 0 -52 58 8 19 1 1 10 85 -1 -52 51 44 -53 4 33 -52 2 0 -53 54 45 - 5 0 0 -52 57 59 19 1 0 11 84 -2 -52 51 35 -53 4 24 -52 1 51 -53 54 37 - 4 0 0 -52 57 32 19 0 59 11 83 -3 -52 51 8 -53 3 57 -52 1 24 -53 54 10 - 3 0 0 -52 56 47 19 0 58 12 82 -3 -52 50 23 -53 3 12 -52 0 38 -53 53 26 - 2 0 0 -52 55 44 19 0 57 12 81 -4 -52 49 20 -53 2 9 -51 59 34 -53 52 24 - 1 0 0 -52 54 23 19 0 56 13 81 -4 -52 47 59 -53 0 48 -51 58 11 -53 51 4 0 0 0 -52 52 44 19 0 55 14 80 -5 -52 46 19 -52 59 9 -51 56 30 -53 49 27 1 0 0 -52 50 47 19 0 54 14 79 -5 -52 44 22 -52 57 12 -51 54 32 -53 47 31 2 0 0 -52 48 32 19 0 52 15 78 -6 -52 42 6 -52 54 57 -51 52 14 -53 45 18 3 0 0 -52 45 58 19 0 51 15 77 -7 -52 39 33 -52 52 24 -51 49 39 -53 42 47 4 0 0 -52 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3 12 22 - 3 25 17 .. .. .. - 4 15 56 Uncertainty in time = +/- 9 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 4684-01612-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 22 13.8700 DE: -04 49 59.449 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 10.0 * B mag [mag]: 10.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2802) Weisell approx. diameter [km]: 21 approx. diameter ["]: .012 distance from Earth [AU]: 2.51000 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 666 number of rejected observations: 21 time covered by the observations: 1939 Jan 18 - 2008 Sep 29 1 sigma uncertainty ellipse (major, minor, PA): 0.068, 0.042, 71° remarks: * orbital elements for (2802) Weisell : Mean anomaly = 189.56872869 deg Arg. of pericenter = 61.17992167 deg Long. of node = 129.43662300 deg Inclination = 9.61948083 deg Eccentricity = 0.12326047 Semimajor axis = 3.11078114 AU Perihelion dist = 2.72734480 AU Mag: H = 10.82, G = 0.15 Epoch of elements : MJD 54751.78800000 TDT (2008 Oct 12.788) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 12 2802 Weisell 18h 54.8m UT 10.0 1 22 13.870- 4 49 59.45TYC 4684-01612-1 10.2 16.1 21 1.4 2.510 -1.791 -12.27 75.1310 -4.830 -107.13 -7.75 18.9139 0.19351 -0.42175 -7.63981 -3.50454 -0.00023 0.00128 2000 189.24753520081011.00000 61.179922129.436623 9.6194810.12326047 3.1107811 2.727344811.0 5.00.15 RATE 1.7963870 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.071 0.046 72 4.90 0.045 0 54740.5020081012_1612-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org