IOTA/IOTA-ES occultation update for (84) Klio / TYC 0263-00457-1 event on 2009 Feb 10, 17:28 UT Visible from Summary ------- On 2009 Feb 10 UT, the 79 km diameter asteroid (84) Klio will occult a 10.7 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 13.7 mag (the magnitude of the asteroid) for at most 6.4 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: 94 * date and approx. time of event: 2009 Feb 10, 17:21 - 2009 Feb 10, 17:35 UT * magnitude of target star: 10.7 * magnitude drop [mag]: 3.1 * estimated maximum duration [s]: 6.4 * Moon: 98 % sunlit, 12° distance * Sun: 154° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 94 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .025", 106° ) * approx speed of asteroid's shadow [km/s]: 12.4535 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0263-00457-1 by 84 Klio on 2009 Feb 10 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 32 0 0 42 34 32 17 35 14 0 88 -26 43 0 11 42 9 0 43 23 54 41 45 37 33 0 0 42 36 31 17 35 14 1 88 -27 43 2 10 42 10 59 43 25 53 41 47 37 34 0 0 42 38 21 17 35 14 2 89 -27 43 4 0 42 12 50 43 27 43 41 49 27 35 0 0 42 40 3 17 35 14 3 90 -28 43 5 42 42 14 32 43 29 24 41 51 9 36 0 0 42 41 36 17 35 13 3 90 -29 43 7 14 42 16 4 43 30 57 41 52 42 37 0 0 42 42 59 17 35 13 4 91 -29 43 8 38 42 17 28 43 32 20 41 54 6 38 0 0 42 44 14 17 35 12 5 92 -30 43 9 53 42 18 43 43 33 35 41 55 21 39 0 0 42 45 20 17 35 11 6 92 -31 43 10 58 42 19 49 43 34 41 41 56 27 40 0 0 42 46 17 17 35 11 6 93 -32 43 11 55 42 20 46 43 35 37 41 57 24 41 0 0 42 47 5 17 35 10 7 94 -32 43 12 43 42 21 34 43 36 25 41 58 12 42 0 0 42 47 44 17 35 9 8 94 -33 43 13 22 42 22 13 43 37 4 41 58 51 43 0 0 42 48 14 17 35 8 8 95 -34 43 13 53 42 22 43 43 37 35 41 59 21 44 0 0 42 48 35 17 35 6 9 96 -34 43 14 14 42 23 4 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26 18 1 24 39 18 -160 0 0 25 23 12 17 21 23 16 265 0 25 48 58 24 57 34 26 12 47 24 34 5 Uncertainty in time = +/- 3 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 0263-00457-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 11 51.6602 DE: +02 05 14.452 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 10.7 * B mag [mag]: 10.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (84) Klio approx. diameter [km]: 79 approx. diameter ["]: .054 distance from Earth [AU]: 2.00300 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 750 number of rejected observations: 68 time covered by the observations: 1900 Mar 06 - 2008 Mar 30 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.015, 122° remarks: * orbital elements for (84) Klio : Mean anomaly = 175.75788403 deg Arg. of pericenter = 14.76638693 deg Long. of node = 327.64064291 deg Inclination = 9.33492736 deg Eccentricity = 0.23664238 Semimajor axis = 2.36229842 AU Perihelion dist = 1.80327851 AU Mag: H = 9.21, G = 0.15 Epoch of elements : MJD 54872.72800000 TDT (2009 Feb 10.728) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 10 84 Klio 17h 28.1m UT 10.7 11 11 51.660 2 5 14.45TYC 0263-00457-1 10.9 13.7 79 6.4 2.003 -2.034 4.89 125.0144 2.087 -78.47 -14.14 17.4685 0.08731 0.54116 -6.94064 1.11172 -0.00230 0.00126 2000 175.0173482009 2 8.00000 14.766387327.640643 9.3349270.23664238 2.3622984 1.8032785 9.3 5.00.15 RATE 2.7145750 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.025 106 1.46 0.025 0 54776.5020090210_0457-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org