IOTA/IOTA-ES occultation update for (690) Wratislavia / UCAC2 31251826 event on 2009 Jul 07, 08:58 UT Visible from Summary ------- On 2009 Jul 07 UT, the 135 km diameter asteroid (690) Wratislavia will occult a 12.0 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.0 mag to 12.4 mag (the magnitude of the asteroid) for at most 18.0 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: 97 * date and approx. time of event: 2009 Jul 07, 08:48 - 2009 Jul 07, 09:10 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 1.0 * estimated maximum duration [s]: 18.0 * Moon: 100 % sunlit, 37° distance * Sun: 143° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 152 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 7.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .048 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .048", .033", 80° ) * approx speed of asteroid's shadow [km/s]: 7.4735 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 31251826 by 690 Wratislavia on 2009 Jul 7 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 170 0 0 54 39 48 9 10 46 1 95 0 55 21 6 53 58 45 55 54 20 53 26 6 171 0 0 54 37 1 9 10 46 2 96 -1 55 18 21 53 55 56 55 51 36 53 23 14 172 0 0 54 33 54 9 10 46 2 97 -1 55 15 17 53 52 47 55 48 34 53 20 4 173 0 0 54 30 29 9 10 45 3 97 -2 55 11 54 53 49 19 55 45 13 53 16 34 174 0 0 54 26 44 9 10 45 4 98 -2 55 8 12 53 45 32 55 41 34 53 12 44 175 0 0 54 22 41 9 10 44 4 99 -3 55 4 12 53 41 25 55 37 36 53 8 36 176 0 0 54 18 18 9 10 43 5 100 -3 54 59 52 53 37 0 55 33 19 53 4 8 177 0 0 54 13 36 9 10 42 5 101 -4 54 55 14 53 32 15 55 28 43 52 59 20 178 0 0 54 8 35 9 10 42 6 101 -4 54 50 16 53 27 10 55 23 48 52 54 13 179 0 0 54 3 15 9 10 40 7 102 -4 54 44 59 53 21 46 55 18 35 52 48 46 180 0 0 53 57 35 9 10 39 7 103 -5 54 39 24 53 16 3 55 13 2 52 42 59 -179 0 0 53 51 36 9 10 38 8 104 -5 54 33 28 53 10 0 55 7 10 52 36 53 -178 0 0 53 45 17 9 10 37 8 105 -6 54 27 14 53 3 37 55 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57 8 52 15 52 253 -16 11 44 24 10 15 48 12 20 13 9 40 41 - 63 0 0 10 35 48 8 52 2 51 254 -15 11 20 10 9 51 46 11 55 53 9 16 44 - 62 0 0 10 12 2 8 51 49 50 255 -14 10 56 17 9 28 5 11 31 54 8 53 8 - 61 0 0 9 48 36 8 51 36 49 255 -14 10 32 45 9 4 46 11 8 18 8 29 54 - 60 0 0 9 25 33 8 51 23 49 256 -13 10 9 36 8 41 49 10 45 3 8 7 2 - 59 0 0 9 2 52 8 51 10 48 257 -12 9 46 49 8 19 14 10 22 11 7 44 32 - 58 0 0 8 40 35 8 50 58 47 258 -12 9 24 25 7 57 3 9 59 42 7 22 25 - 57 0 0 8 18 40 8 50 46 46 259 -11 9 2 24 7 35 14 9 37 37 7 0 41 - 56 0 0 7 57 10 8 50 34 45 259 -10 8 40 48 7 13 49 9 15 55 6 39 21 - 55 0 0 7 36 3 8 50 22 44 260 -10 8 19 35 6 52 49 8 54 38 6 18 25 - 54 0 0 7 15 21 8 50 10 44 260 -9 7 58 47 6 32 12 8 33 45 5 57 53 - 53 0 0 6 55 3 8 49 59 43 261 -8 7 38 24 6 12 0 8 13 17 5 37 46 - 52 0 0 6 35 11 8 49 47 42 262 -7 7 18 26 5 52 13 7 53 14 5 18 3 - 51 0 0 6 15 44 8 49 36 41 262 -7 6 58 53 5 32 52 7 33 37 4 58 46 - 50 0 0 5 56 43 8 49 25 40 263 -6 6 39 46 5 13 56 7 14 26 4 39 54 - 49 0 0 5 38 7 8 49 15 39 263 -5 6 21 5 4 55 26 6 55 40 4 21 29 - 48 0 0 5 19 58 8 49 4 38 263 -4 6 2 51 4 37 22 6 37 22 4 3 29 - 47 0 0 5 2 16 8 48 54 37 264 -4 5 45 3 4 19 45 6 19 30 3 45 55 - 46 0 0 4 45 0 8 48 44 36 264 -3 5 27 42 4 2 34 6 2 5 3 28 49 - 45 0 0 4 28 11 8 48 34 35 265 -2 5 10 49 3 45 50 5 45 7 3 12 9 - 44 0 0 4 11 50 8 48 25 35 265 -1 4 54 22 3 29 33 5 28 36 2 55 56 - 43 0 0 3 55 56 8 48 15 34 265 -1 4 38 24 3 13 44 5 12 34 2 40 10 Uncertainty in time = +/- 9 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 31251826 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 12 57.7536 DE: -01 53 52.314 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .036, .030 ) * V mag [mag]: 12.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (690) Wratislavia approx. diameter [km]: 135 approx. diameter ["]: .098 distance from Earth [AU]: 1.90100 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 663 number of rejected observations: 90 time covered by the observations: 1902 Jun 03 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.013, 68° remarks: * orbital elements for (690) Wratislavia : Mean anomaly = 317.21786368 deg Arg. of pericenter = 114.90419973 deg Long. of node = 253.29031083 deg Inclination = 11.26730954 deg Eccentricity = 0.18469068 Semimajor axis = 3.14605237 AU Perihelion dist = 2.56500583 AU Mag: H = 7.75, G = 0.15 Epoch of elements : MJD 55019.37400000 TDT (2009 Jul 07.374) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 7 690 Wratislavia 8h 58.2m UT 12.0 21 12 57.754- 1 53 52.31UCAC2 31251826 0.0 12.4 135 18.0 1.901 -1.157 8.96 -101.7641 -1.900 46.70 22.55 8.9693 0.21030 0.40592 -3.74685 1.93771 -0.00267 -0.00197 2000 315.5621702009 628.00000114.904200253.290311 11.2673100.18469068 3.1460524 2.5650058 8.0 5.00.15 RATE 1.7662620 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.048 0.033 80 1.40 0.039 0 54545.5020090707_251826 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org