IOTA/IOTA-ES occultation update for (165) Loreley / UCAC2 17735159 event on 2008 May 20, 02:09 UT Visible from Brazil, Colombia, Central America, Mexico Summary ------- On 2008 May 20 UT, the 155 km diameter asteroid (165) Loreley will occult a 11.8 mag star in the constellation Centaurus for observers along a path across Brazil, Colombia, Central America, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 12.0 mag (the magnitude of the asteroid) for at most 13.1 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: 99 * date and approx. time of event: 2008 May 20, 02:01 - 2008 May 20, 02:18 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 13.1 * Moon: 100 % sunlit, 14° distance * Sun: 163° distance * rough path description: Brazil, Colombia, Central America, Mexico The occultation path -------------------- * approximate projected width [km]: 161 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .026", 94° ) * approx speed of asteroid's shadow [km/s]: 11.8414 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 17735159 by 165 Loreley on 2008 May 20 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 -111 0 0 33 0 30 2 18 32 1 132 -1 33 59 13 32 2 11 34 28 43 31 33 9 -110 0 0 32 15 13 2 18 32 2 132 -2 33 14 8 31 16 42 33 43 44 30 47 35 -109 0 0 31 29 14 2 18 31 4 133 -3 32 28 20 30 30 32 32 58 2 30 1 20 -108 0 0 30 42 35 2 18 30 5 134 -4 31 41 50 29 43 43 32 11 38 29 14 25 -107 0 0 29 55 16 2 18 29 6 134 -5 30 54 41 28 56 15 31 24 33 28 26 53 -106 0 0 29 7 20 2 18 28 7 135 -6 30 6 53 28 8 10 30 36 50 27 38 44 -105 0 0 28 18 48 2 18 26 8 135 -7 29 18 29 27 19 31 29 48 29 26 50 1 -104 0 0 27 29 41 2 18 25 9 135 -9 28 29 29 26 30 18 28 59 32 26 0 45 -103 0 0 26 40 2 2 18 23 11 136 -10 27 39 55 25 40 33 28 10 2 25 10 58 -102 0 0 25 49 52 2 18 20 12 136 -11 26 49 51 24 50 19 27 19 59 24 20 41 -101 0 0 24 59 15 2 18 18 13 137 -12 25 59 16 23 59 38 26 29 27 23 29 58 -100 0 0 24 8 10 2 18 15 14 137 -13 25 8 15 23 8 31 25 38 27 22 38 50 - 99 0 0 23 16 42 2 18 12 16 138 -14 24 16 48 22 17 1 24 47 1 21 47 19 - 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9 39 0 -12 14 58 51 0 0 -10 18 57 2 1 13 2 236 -11 - 9 26 31 -11 11 7 - 9 0 11 -11 37 6 52 0 0 - 9 39 46 2 1 13 0 236 -10 .. .. .. -10 32 15 .. .. .. -10 58 23 Uncertainty in time = +/- 5 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: UCAC2 17735159 * constellation : Centaurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 57 34.8335 DE: -33 16 58.310 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .022 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (165) Loreley approx. diameter [km]: 155 approx. diameter ["]: .107 distance from Earth [AU]: 1.99700 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 764 number of rejected observations: 99 time covered by the observations: 1906 Dec 17 - 2008 Apr 19 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.013, 104° remarks: * orbital elements for (165) Loreley : Mean anomaly = 308.40359981 deg Arg. of pericenter = 350.84339436 deg Long. of node = 302.65073599 deg Inclination = 11.23930341 deg Eccentricity = 0.08338865 Semimajor axis = 3.12571556 AU Perihelion dist = 2.86506636 AU Mag: H = 7.74, G = 0.15 Epoch of elements : MJD 54606.09000000 TDT (2008 May 20.090) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 20 165 Loreley 2h 9.9m UT 11.8 14 57 34.834-33 16 58.31UCAC2 17735159 0.0 12.0 155 13.1 1.997 -2.101 13.10 -46.1866 -33.286 146.66 20.03 2.1647 0.11655 0.23461 -5.98530 2.97433 0.00116 0.00122 2000 307.3174322008 514.00000350.843394302.650736 11.2393030.08338865 3.1257156 2.8650664 7.7 5.00.15 RATE 1.7835270 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.026 94 1.25 0.027 0 54594.5020080520_735159 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org