IOTA/IOTA-ES occultation update for (363) Padua / TYC 0028-00036-1 event on 2009 Oct 01, 08:42 UT Visible from Summary ------- On 2009 Oct 01 UT, the 72 km diameter asteroid (363) Padua will occult a 10.5 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 12.5 mag (the magnitude of the asteroid) for at most 7.3 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: 96 * date and approx. time of event: 2009 Oct 01, 08:33 - 2009 Oct 01, 08:52 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 7.3 * Moon: 92 % sunlit, 49° distance * Sun: 164° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 78 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .026", 72° ) * approx speed of asteroid's shadow [km/s]: 9.8970 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0028-00036-1 by 363 Padua on 2009 Oct 1 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 153 0 0 -39 44 31 8 52 30 1 87 -12 -39 23 27 -40 5 38 -39 6 12 -40 23 0 154 0 0 -39 41 51 8 52 30 1 86 -13 -39 20 46 -40 2 59 -39 3 32 -40 20 21 155 0 0 -39 38 56 8 52 30 2 85 -14 -39 17 51 -40 0 5 -39 0 35 -40 17 27 156 0 0 -39 35 45 8 52 29 3 85 -14 -39 14 39 -39 56 55 -38 57 24 -40 14 18 157 0 0 -39 32 19 8 52 29 4 84 -15 -39 11 13 -39 53 29 -38 53 56 -40 10 52 158 0 0 -39 28 37 8 52 28 4 83 -16 -39 7 30 -39 49 48 -38 50 13 -40 7 12 159 0 0 -39 24 40 8 52 27 5 83 -17 -39 3 32 -39 45 51 -38 46 15 -40 3 16 160 0 0 -39 20 27 8 52 26 6 82 -17 -38 59 19 -39 41 39 -38 42 1 -39 59 5 161 0 0 -39 15 59 8 52 25 7 82 -18 -38 54 50 -39 37 12 -38 37 31 -39 54 38 162 0 0 -39 11 16 8 52 24 8 81 -19 -38 50 6 -39 32 29 -38 32 46 -39 49 56 163 0 0 -39 6 17 8 52 23 8 80 -20 -38 45 6 -39 27 31 -38 27 46 -39 44 59 164 0 0 -39 1 3 8 52 22 9 80 -20 -38 39 51 -39 22 18 -38 22 30 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27 - 6 20 32 - 49 0 0 - 5 36 6 8 33 38 24 275 -8 - 5 14 58 - 5 57 18 - 4 57 40 - 6 14 43 - 48 0 0 - 5 30 37 8 33 33 23 275 -7 - 5 9 29 - 5 51 48 - 4 52 11 - 6 9 13 - 47 0 0 - 5 25 27 8 33 28 22 275 -6 - 5 4 19 - 5 46 37 - 4 47 2 - 6 4 2 - 46 0 0 - 5 20 35 8 33 24 21 274 -5 - 4 59 28 - 5 41 45 - 4 42 11 - 5 59 9 - 45 0 0 - 5 16 3 8 33 20 20 274 -4 - 4 54 56 - 5 37 13 - 4 37 40 - 5 54 36 - 44 0 0 - 5 11 49 8 33 16 19 274 -3 - 4 50 43 - 5 32 59 - 4 33 27 - 5 50 22 - 43 0 0 - 5 7 56 8 33 12 18 274 -2 - 4 46 49 - 5 29 5 - 4 29 34 - 5 46 28 - 42 0 0 - 5 4 21 8 33 9 17 274 -1 - 4 43 15 - 5 25 30 - 4 26 0 - 5 42 53 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0028-00036-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 34 20.7601 DE: +02 09 13.523 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 10.5 * B mag [mag]: 10.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (363) Padua approx. diameter [km]: 72 approx. diameter ["]: .063 distance from Earth [AU]: 1.58200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 723 number of rejected observations: 118 time covered by the observations: 1916 Mar 10 - 2008 Feb 03 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.017, 64° remarks: * orbital elements for (363) Padua : Mean anomaly = 16.16507273 deg Arg. of pericenter = 293.28923909 deg Long. of node = 64.91018260 deg Inclination = 5.94445454 deg Eccentricity = 0.07155824 Semimajor axis = 2.74675661 AU Perihelion dist = 2.55020353 AU Mag: H = 8.93, G = 0.15 Epoch of elements : MJD 55105.36300000 TDT (2009 Oct 01.363) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 1 363 Padua 8h 42.6m UT 10.5 1 34 20.760 2 9 13.52TYC 0028-00036-1 10.9 12.5 72 7.3 1.582 -1.978 -9.26 -117.2771 2.156 46.78 -3.30 8.7096 0.11316 -0.36110 -5.33188 -1.66620 -0.00154 0.00012 2000 15.0039412009 926.00000293.289239 64.910183 5.9444550.07155824 2.7467566 2.5502035 9.0 5.00.15 RATE 2.1650790 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.026 72 1.41 0.026 0 54545.5020091001_0036-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 14:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org