IOTA/IOTA-ES occultation update for (55) Pandora / TYC 6375-00618-1 event on 2009 Sep 03, 13:49 UT Visible from Summary ------- On 2009 Sep 03 UT, the 67 km diameter asteroid (55) Pandora will occult a 12.1 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.4 mag to 11.2 mag (the magnitude of the asteroid) for at most 7.7 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: 93 * date and approx. time of event: 2009 Sep 03, 13:36 - 2009 Sep 03, 14:00 UT * magnitude of target star: 12.1 * magnitude drop [mag]: 0.4 * estimated maximum duration [s]: 7.7 * Moon: 99 % sunlit, 13° distance * Sun: 159° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 67 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 6.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .028", 82° ) * approx speed of asteroid's shadow [km/s]: 8.6785 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6375-00618-1 by 55 Pandora on 2009 Sep 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 ' " Latitude Latitude Latitude Latitude 60 0 0 - 4 18 31 14 0 39 17 111 -1 - 3 59 6 - 4 37 56 - 3 40 50 - 4 56 11 61 0 0 - 4 40 44 14 0 35 18 111 -2 - 4 21 19 - 5 0 7 - 4 3 4 - 5 18 21 62 0 0 - 5 2 45 14 0 31 19 111 -3 - 4 43 22 - 5 22 8 - 4 25 8 - 5 40 20 63 0 0 - 5 24 35 14 0 27 20 111 -4 - 5 5 13 - 5 43 57 - 4 47 0 - 6 2 8 64 0 0 - 5 46 13 14 0 22 21 111 -5 - 5 26 52 - 6 5 34 - 5 8 41 - 6 23 44 65 0 0 - 6 7 39 14 0 17 22 111 -6 - 5 48 20 - 6 26 59 - 5 30 9 - 6 45 8 66 0 0 - 6 28 53 14 0 12 23 111 -7 - 6 9 34 - 6 48 11 - 5 51 25 - 7 6 19 67 0 0 - 6 49 54 14 0 7 24 111 -8 - 6 30 36 - 7 9 10 - 6 12 28 - 7 27 17 68 0 0 - 7 10 41 14 0 1 25 111 -9 - 6 51 25 - 7 29 57 - 6 33 18 - 7 48 3 69 0 0 - 7 31 15 13 59 56 26 111 -10 - 7 12 1 - 7 50 29 - 6 53 55 - 8 8 34 70 0 0 - 7 51 35 13 59 50 27 110 -11 - 7 32 22 - 8 10 48 - 7 14 17 - 8 28 51 71 0 0 - 8 11 41 13 59 44 28 110 -12 - 7 52 29 - 8 30 53 - 7 34 26 - 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-30 - 1 35 9 - 2 14 10 - 1 16 48 - 2 32 30 -143 0 0 - 1 31 26 13 36 59 12 248 -29 - 1 11 54 - 1 50 57 - 0 53 32 - 2 9 18 -142 0 0 - 1 8 5 13 36 56 11 248 -28 - 0 48 32 - 1 27 37 - 0 30 10 - 1 45 58 -141 0 0 - 0 44 37 13 36 54 10 248 -26 - 0 25 4 - 1 4 10 - 0 6 41 - 1 22 31 -140 0 0 - 0 21 3 13 36 51 9 248 -25 - 0 1 30 - 0 40 37 0 16 54 - 0 58 59 -139 0 0 0 2 36 13 36 49 8 248 -24 0 22 10 - 0 16 58 0 40 34 - 0 35 21 -138 0 0 0 26 20 13 36 48 7 248 -23 0 45 55 0 6 45 1 4 19 - 0 11 38 -137 0 0 0 50 8 13 36 46 6 248 -22 1 9 44 0 30 33 1 28 9 0 12 10 -136 0 0 1 14 1 13 36 45 5 248 -21 1 33 36 0 54 25 1 52 2 0 36 1 -135 0 0 1 37 56 13 36 44 4 248 -20 1 57 32 1 18 20 2 15 58 0 59 56 -134 0 0 2 1 54 13 36 43 3 248 -19 2 21 31 1 42 18 2 39 57 1 23 53 -133 0 0 2 25 55 13 36 43 2 248 -18 2 45 31 2 6 19 3 3 58 1 47 53 -132 0 0 2 49 57 13 36 42 1 248 -17 3 9 34 2 30 21 3 28 0 2 11 55 Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6375-00618-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 46 08.2309 DE: -21 45 14.541 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .043, .025 ) * V mag [mag]: 12.1 * B mag [mag]: 13.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (55) Pandora approx. diameter [km]: 67 approx. diameter ["]: .062 distance from Earth [AU]: 1.48500 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1173 number of rejected observations: 98 time covered by the observations: 1913 Oct 24 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.030, 0.014, 66° remarks: * orbital elements for (55) Pandora : Mean anomaly = 325.90569229 deg Arg. of pericenter = 3.64219527 deg Long. of node = 10.45846574 deg Inclination = 7.18601908 deg Eccentricity = 0.14427283 Semimajor axis = 2.76105673 AU Perihelion dist = 2.36271127 AU Mag: H = 7.67, G = 0.15 Epoch of elements : MJD 55077.57600000 TDT (2009 Sep 03.576) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 3 55 Pandora 13h 48.9m UT 12.1 21 46 8.231-21 45 14.54TYC 6375-00618-1 13.0 11.2 67 7.7 1.485 -2.081 -0.32 136.4680 -21.754 -27.41 7.36 13.8157 -0.00073 0.04509 -4.89809 -0.05542 0.00150 0.00128 2000 324.2781542009 827.00000 3.642195 10.458466 7.1860190.14427283 2.7610567 2.3627113 7.8 5.00.15 RATE 2.1482810 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.028 82 1.47 0.029 0 54545.5020090903_0618-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 12:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org