IOTA/IOTA-ES occultation update for (1366) Piccolo / TYC 6950-00844-1 event on 2009 Sep 05, 00:11 UT Visible from Summary ------- On 2009 Sep 05 UT, the 28 km diameter asteroid (1366) Piccolo will occult a 11.8 mag star in the constellation Microscopium for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 14.1 mag (the magnitude of the asteroid) for at most 3.8 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: 38 * date and approx. time of event: 2009 Sep 05, 23:58 - 2009 Sep 06, 00:27 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 3.8 * Moon: 100 % sunlit, 35° distance * Sun: 149° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 28 * 1 sigma uncertainty interval [path widths]: +/- 1.75 * 1 sigma uncertainty interval [seconds]: +/- 8.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .064 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .035", 76° ) * approx speed of asteroid's shadow [km/s]: 7.2197 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6950-00844-1 by 1366 Piccolo on 2009 Sep 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 - 96 0 0 4 2 31 24 27 30 19 122 -1 4 11 28 3 53 34 4 42 46 3 22 16 - 95 0 0 3 25 3 24 27 24 20 122 -2 3 34 0 3 16 6 4 5 19 2 44 47 - 94 0 0 2 47 31 24 27 18 21 122 -3 2 56 28 2 38 34 3 27 48 2 7 14 - 93 0 0 2 9 56 24 27 11 22 122 -4 2 18 53 2 0 59 2 50 13 1 29 39 - 92 0 0 1 32 19 24 27 4 23 122 -5 1 41 16 1 23 22 2 12 37 0 52 2 - 91 0 0 0 54 41 24 26 57 24 122 -6 1 3 39 0 45 44 1 34 59 0 14 25 - 90 0 0 0 17 4 24 26 49 26 123 -7 0 26 2 0 8 7 0 57 22 - 0 23 12 - 89 0 0 - 0 20 31 24 26 42 27 123 -8 - 0 11 34 - 0 29 28 0 19 46 - 1 0 47 - 88 0 0 - 0 58 4 24 26 33 28 122 -9 - 0 49 7 - 1 7 0 - 0 17 48 - 1 38 18 - 87 0 0 - 1 35 32 24 26 25 29 122 -10 - 1 26 36 - 1 44 29 - 0 55 18 - 2 15 46 - 86 0 0 - 2 12 56 24 26 16 30 122 -11 - 2 4 0 - 2 21 52 - 1 32 43 - 2 53 8 - 85 0 0 - 2 50 14 24 26 7 31 122 -12 - 2 41 18 - 2 59 9 - 2 10 2 - 3 30 24 - 84 0 0 - 3 27 24 24 25 58 32 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-14 59 3 23 58 50 1 240 -16 -14 50 18 -15 7 48 -14 19 41 -15 38 24 Uncertainty in time = +/- 10 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6950-00844-1 * constellation : Microscopium * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 24 19.0209 DE: -28 53 34.015 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .038, .023 ) * V mag [mag]: 11.8 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1366) Piccolo approx. diameter [km]: 28 approx. diameter ["]: .025 distance from Earth [AU]: 1.55600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 882 number of rejected observations: 60 time covered by the observations: 1932 Nov 29 - 2008 Feb 12 1 sigma uncertainty ellipse (major, minor, PA): 0.053, 0.027, 69° remarks: * orbital elements for (1366) Piccolo : Mean anomaly = 12.67580519 deg Arg. of pericenter = 283.97213395 deg Long. of node = 24.17563104 deg Inclination = 9.47127764 deg Eccentricity = 0.14301649 Semimajor axis = 2.87515089 AU Perihelion dist = 2.46395691 AU Mag: H = 10.26, G = 0.15 Epoch of elements : MJD 55079.00800000 TDT (2009 Sep 05.008) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 5 1366 Piccolo 0h 13.5m UT 11.8 21 24 19.021-28 53 34.01TYC 6950-00844-1 11.8 14.1 28 3.8 1.556 -1.682 6.44 -26.5526 -28.895 176.32 6.84 0.2258 -0.00272 -0.00836 -3.91279 1.13822 0.00211 0.00185 2000 10.8546732009 827.00000283.972134 24.175631 9.4712780.14301649 2.8751509 2.463956910.5 5.00.15 RATE 2.0216830 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.035 76 2.75 0.043 0 54545.5020090905_0844-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 12:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org