IOTA/IOTA-ES occultation update for (165) Loreley / TYC 6773-00770-1 event on 2008 Feb 03, 07:45 UT Visible from SE USA Summary ------- On 2008 Feb 03 UT, the 155 km diameter asteroid (165) Loreley will occult a 10.3 mag star in the constellation Libra for observers along a path across SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.3 mag to 13.5 mag (the magnitude of the asteroid) for at most 7.0 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: 98 * date and approx. time of event: 2008 Feb 03, 07:41 - 2008 Feb 03, 07:50 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 3.3 * estimated maximum duration [s]: 7.0 * Moon: 14 % sunlit, 37° distance * Sun: 81° distance * rough path description: SE USA Additional comments ------------------- low altitude The occultation path -------------------- * approximate projected width [km]: 164 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .025", 93° ) * approx speed of asteroid's shadow [km/s]: 22.0373 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6773-00770-1 by 165 Loreley on 2008 Feb 03 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 - 83 0 0 .. .. .. .. .. .. .. .. .. 39 25 31 .. .. .. 38 45 32 .. .. .. - 82 0 0 39 44 17 7 41 20 1 130 -55 38 46 33 40 42 26 38 6 23 .. .. .. - 81 0 0 39 4 47 7 41 20 2 131 -55 38 6 49 40 3 12 37 26 29 40 44 22 - 80 0 0 38 24 31 7 41 21 3 132 -55 37 26 18 39 23 11 36 45 48 40 4 31 - 79 0 0 37 43 29 7 41 21 4 132 -54 36 45 2 38 42 23 36 4 23 39 23 53 - 78 0 0 37 1 41 7 41 21 5 133 -54 36 3 1 38 0 48 35 22 12 38 42 29 - 77 0 0 36 19 8 7 41 22 6 134 -53 35 20 15 37 18 29 34 39 18 38 0 18 - 76 0 0 35 35 51 7 41 23 7 134 -53 34 36 46 36 35 24 33 55 40 37 17 22 - 75 0 0 34 51 50 7 41 23 8 135 -52 33 52 34 35 51 35 33 11 20 36 33 42 - 74 0 0 34 7 7 7 41 24 9 135 -52 33 7 40 35 7 3 32 26 19 35 49 17 - 73 0 0 33 21 42 7 41 25 11 136 -51 32 22 5 34 21 48 31 40 37 35 4 10 - 72 0 0 32 35 37 7 41 27 12 136 -51 31 35 51 33 35 53 30 54 16 34 18 21 - 71 0 0 31 48 53 7 41 28 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Data for the target star ------------------------ * name: TYC 6773-00770-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 07 18.9387 DE: -29 16 39.499 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .023 ) * V mag [mag]: 10.3 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (165) Loreley approx. diameter [km]: 155 approx. diameter ["]: .070 distance from Earth [AU]: 3.04800 * orbital information: orbit source: Preston date of fit: 2008 Jan 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 751 number of rejected observations: 99 time covered by the observations: 1906 Dec 17 - 2007 Jun 08 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.009, 102° remarks: * orbital elements for (165) Loreley : Mean anomaly = 289.28575563 deg Arg. of pericenter = 350.90651298 deg Long. of node = 302.65265825 deg Inclination = 11.23921309 deg Eccentricity = 0.08326269 Semimajor axis = 3.12525002 AU Perihelion dist = 2.86503330 AU Mag: H = 7.73, G = 0.15 Epoch of elements : MJD 54499.32400000 TDT (2008 Feb 03.324) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 03 165 Loreley 7h 45.9m UT 10.3 15 7 18.939-29 16 39.50TYC 6773-00770-1 11.9 13.5 155 7.0 3.048 2.413 -17.05 -22.518 -29.273 66.97 -16.67 7.7648 .15799 .29052 10.94430 -5.91085 -0.00576 0.00147 2000 287.6224232008 125.00000350.906513302.652658 11.2392130.083262693.125250022.865033307.655 0.15 RATE 1.7839260 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.026 0.025 93.4 1.350 0.025 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 30, 22:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org