IOTA/IOTA-ES occultation update for (488) Kreusa / 2UCAC 20711590 event on 2009 Jul 04, 09:26 UT Visible from Mexico, SW USA Summary ------- On 2009 Jul 04 UT, the 150 km diameter asteroid (488) Kreusa will occult a 12.5 mag star in the constellation Sagittarius for observers along a path across Mexico, SW USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.8 mag to 12.6 mag (the magnitude of the asteroid) for at most 10.5 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: 85 * date and approx. time of event: 2009 Jul 04, 09:20 - 2009 Jul 04, 09:32 UT * magnitude of target star: 12.5 * magnitude drop [mag]: 0.8 * estimated maximum duration [s]: 10.5 * Moon: 92 % sunlit, 28° distance * Sun: 174° distance * rough path description: Mexico, SW USA The occultation path -------------------- * approximate projected width [km]: 181 * 1 sigma uncertainty interval [path widths]: +/- 0.60 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .052", 91° ) * approx speed of asteroid's shadow [km/s]: 14.3147 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 20711590 by 488 Kreusa on 2009 Jul 4 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 135 0 0 16 2 4 9 32 29 3 119 0 16 58 13 15 6 38 18 6 34 14 0 59 136 0 0 15 32 24 9 32 29 4 120 -1 16 28 18 14 37 13 17 36 21 13 31 50 137 0 0 15 3 17 9 32 28 5 120 -2 15 58 56 14 8 20 17 6 40 13 3 14 138 0 0 14 34 44 9 32 27 6 120 -3 15 30 8 13 40 0 16 37 33 12 35 10 139 0 0 14 6 43 9 32 26 7 121 -4 15 1 53 13 12 14 16 9 1 12 7 40 140 0 0 13 39 17 9 32 24 9 121 -5 14 34 13 12 45 1 15 41 3 11 40 43 141 0 0 13 12 26 9 32 23 10 121 -7 14 7 7 12 18 23 15 13 39 11 14 21 142 0 0 12 46 9 9 32 21 11 121 -8 13 40 37 11 52 20 14 46 52 10 48 32 143 0 0 12 20 27 9 32 19 12 122 -9 13 14 41 11 26 51 14 20 40 10 23 19 144 0 0 11 55 21 9 32 17 13 122 -10 12 49 22 11 1 58 13 55 4 9 58 41 145 0 0 11 30 51 9 32 15 14 122 -11 12 24 39 10 37 40 13 30 4 9 34 37 146 0 0 11 6 56 9 32 12 15 122 -12 12 0 31 10 13 58 13 5 41 9 11 9 147 0 0 10 43 38 9 32 10 16 122 -13 11 37 1 9 50 52 12 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Uncertainty in time = +/- 7 secs Prediction of 2009 Jun 30.0 Data for the target star ------------------------ * name: 2UCAC 20711590 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 32 59.7670 DE: -27 12 47.593 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .051, .051 ) * V mag [mag]: 12.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (488) Kreusa approx. diameter [km]: 150 approx. diameter ["]: .087 distance from Earth [AU]: 2.38400 * orbital information: orbit source: Preston date of fit: 2009 Jun 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 838 number of rejected observations: 105 time covered by the observations: 1901 Feb 15 - 2009 Jun 25 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.012, 97° remarks: * orbital elements for (488) Kreusa : Mean anomaly = 108.03963348 deg Arg. of pericenter = 69.15271037 deg Long. of node = 84.97780253 deg Inclination = 11.49728931 deg Eccentricity = 0.16835238 Semimajor axis = 3.15793622 AU Perihelion dist = 2.62629013 AU Mag: H = 7.89, G = 0.15 Epoch of elements : MJD 55016.39300000 TDT (2009 Jul 04.393) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 4 488 Kreusa 9h 26.4m UT 12.5 18 32 59.767-27 12 47.592UCAC 20711590 0.0 12.6 150 10.5 2.384 -2.163 -7.43 -145.8671 -27.211 39.52 22.85 9.4393 -0.13968 0.54320 -7.82448 -2.01445 0.00049 0.00042 2000 106.9168302009 628.00000 69.152710 84.977803 11.4972890.16835238 3.1579362 2.6262901 7.8 5.00.15 RATE 1.7563010 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.052 91 1.60 0.052 0 55012.0020090704_711590 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Jun 30, 15:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org