IOTA/IOTA-ES occultation update for (593) Titania / TYC 1990-00524-1 event on 2008 Mar 03, 20:32 UT Visible from Japan, Russia Summary ------- On 2008 Mar 03 UT, the 75 km diameter asteroid (593) Titania will occult a 12.5 mag star in the constellation Coma Berenices for observers along a path across Japan, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 12.8 mag (the magnitude of the asteroid) for at most 8.2 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: 97 * date and approx. time of event: 2008 Mar 03, 20:25 - 2008 Mar 03, 20:41 UT * magnitude of target star: 12.5 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 8.2 * Moon: 16 % sunlit, 115° distance * Sun: 148° distance * rough path description: Japan, Russia The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 4.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .028", 115° ) * approx speed of asteroid's shadow [km/s]: 9.2138 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1990-00524-1 by 593 Titania on 2008 Mar 3 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 148 0 0 17 52 6 20 25 7 30 290 -1 18 26 23 17 18 9 18 54 3 16 51 13 147 0 0 18 46 54 20 25 17 31 289 -2 19 21 32 18 12 37 19 49 30 17 45 25 146 0 0 19 42 33 20 25 27 32 288 -3 20 17 32 19 7 54 20 45 47 18 40 26 145 0 0 20 38 59 20 25 37 34 288 -4 21 14 20 20 3 59 21 42 53 19 36 15 144 0 0 21 36 11 20 25 48 35 287 -5 22 11 54 21 0 50 22 40 46 20 32 49 143 0 0 22 34 7 20 26 0 36 286 -6 23 10 13 21 58 25 23 39 23 21 30 7 142 0 0 23 32 46 20 26 11 37 285 -7 24 9 14 22 56 41 24 38 44 22 28 6 141 0 0 24 32 4 20 26 23 38 284 -8 25 8 56 23 55 38 25 38 44 23 26 46 140 0 0 25 32 1 20 26 35 39 283 -8 26 9 16 24 55 12 26 39 23 24 26 2 139 0 0 26 32 32 20 26 48 40 282 -9 27 10 11 25 55 20 27 40 38 25 25 53 138 0 0 27 33 36 20 27 1 41 281 -10 28 11 39 26 56 2 28 42 26 26 26 17 137 0 0 28 35 11 20 27 14 42 280 -11 29 13 37 27 57 13 29 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- 49 0 0 68 53 17 20 41 27 11 46 -2 69 33 58 68 13 11 70 6 58 67 41 30 - 50 0 0 68 24 55 20 41 28 11 45 -1 69 6 3 67 44 23 69 39 25 67 12 21 - 51 0 0 67 55 25 20 41 30 10 44 -1 68 37 1 67 14 27 69 10 45 66 42 5 - 52 0 0 67 24 46 20 41 32 9 43 0 68 6 48 66 43 21 68 40 55 66 10 40 Uncertainty in time = +/- 5 secs [Prediction of 2008 Feb 27.0] Data for the target star ------------------------ * name: TYC 1990-00524-1 * constellation : Coma Berenices * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 46 53.9679 DE: +25 28 15.764 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .020 ) * V mag [mag]: 12.5 * B mag [mag]: 13.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (593) Titania approx. diameter [km]: 75 approx. diameter ["]: .071 distance from Earth [AU]: 1.45500 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 600 number of rejected observations: 50 time covered by the observations: 1906 Mar 20 - 2008 Feb 11 1 sigma uncertainty ellipse (major, minor, PA): 0.039, 0.020, 124° remarks: * orbital elements for (593) Titania : Mean anomaly = 44.31321457 deg Arg. of pericenter = 30.85853901 deg Long. of node = 76.18424211 deg Inclination = 16.89201780 deg Eccentricity = 0.21780644 Semimajor axis = 2.69726911 AU Perihelion dist = 2.10978653 AU Mag: H = 9.18, G = 0.06 Epoch of elements : MJD 54528.85600000 TDT (2008 Mar 03.856) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 3 593 Titania 20h 32.4m UT 12.5 12 46 53.968 25 28 15.76TYC 1990-00524-1 13.0 12.8 75 8.2 1.455 -1.873 18.57 81.6324 25.467 -125.16 -6.43 20.5404 0.34769 0.47369 -4.19406 3.07491 -0.00258 -0.00158 2000 42.3428112008 224.00000 30.858539 76.184242 16.8920180.21780644 2.6972691 2.1097865 9.3 5.00.06 RATE 2.2249370 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.045 0.028 115 1.40 0.028 0 54523.5020080303_0524-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 19:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org