IOTA/IOTA-ES occultation update for (877) Walkure / TYC 6377-00353-1 event on 2009 Sep 10, 19:58 UT Visible from Summary ------- On 2009 Sep 10 UT, the 38 km diameter asteroid (877) Walkure will occult a 11.0 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 13.5 mag (the magnitude of the asteroid) for at most 5.1 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: 61 * date and approx. time of event: 2009 Sep 10, 19:44 - 2009 Sep 10, 20:10 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 5.1 * Moon: 65 % sunlit, 93° distance * Sun: 159° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 1.01 * 1 sigma uncertainty interval [seconds]: +/- 7.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .061", .040", 83° ) * approx speed of asteroid's shadow [km/s]: 7.4615 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6377-00353-1 by 877 Walkure on 2009 Sep 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 - 34 0 0 -10 46 48 20 10 41 19 104 0 -10 35 48 -10 57 47 -10 13 33 -11 19 55 - 33 0 0 -10 54 19 20 10 36 20 104 -1 -10 43 20 -11 5 17 -10 21 7 -11 27 24 - 32 0 0 -11 1 18 20 10 31 21 104 -2 -10 50 20 -11 12 16 -10 28 9 -11 34 21 - 31 0 0 -11 7 46 20 10 25 22 104 -3 -10 56 49 -11 18 42 -10 34 39 -11 40 46 - 30 0 0 -11 13 41 20 10 20 23 104 -4 -11 2 45 -11 24 37 -10 40 37 -11 46 40 - 29 0 0 -11 19 5 20 10 14 24 104 -5 -11 8 9 -11 30 0 -10 46 2 -11 52 2 - 28 0 0 -11 23 58 20 10 8 24 103 -6 -11 13 2 -11 34 52 -10 50 57 -11 56 52 - 27 0 0 -11 28 18 20 10 1 25 103 -7 -11 17 24 -11 39 12 -10 55 19 -12 1 11 - 26 0 0 -11 32 8 20 9 55 26 103 -8 -11 21 14 -11 43 1 -10 59 10 -12 4 59 - 25 0 0 -11 35 26 20 9 48 27 103 -9 -11 24 32 -11 46 19 -11 2 29 -12 8 16 - 24 0 0 -11 38 13 20 9 41 28 103 -10 -11 27 20 -11 49 6 -11 5 18 -12 11 2 - 23 0 0 -11 40 29 20 9 34 29 103 -11 -11 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-35 35 41 14 35 16 26 36 6 22 34 51 27 104 0 0 35 54 54 19 44 57 14 237 -34 36 7 16 35 42 32 36 32 20 35 17 36 105 0 0 36 20 33 19 44 53 13 238 -33 36 32 54 36 8 13 36 57 54 35 43 21 106 0 0 36 45 47 19 44 50 12 238 -32 36 58 7 36 33 29 37 23 3 36 8 41 107 0 0 37 10 37 19 44 47 11 239 -32 37 22 54 36 58 21 37 47 47 36 33 36 108 0 0 37 35 1 19 44 45 10 239 -31 37 47 16 37 22 47 38 12 5 36 58 6 109 0 0 37 59 0 19 44 42 10 240 -30 38 11 13 37 46 47 38 35 58 37 22 11 110 0 0 38 22 33 19 44 40 9 241 -29 38 34 44 38 10 22 38 59 25 37 45 50 111 0 0 38 45 40 19 44 38 8 241 -28 38 57 49 38 33 31 39 22 26 38 9 3 112 0 0 39 8 21 19 44 37 7 242 -27 39 20 28 38 56 14 39 45 0 38 31 50 113 0 0 39 30 35 19 44 35 6 242 -26 39 42 41 39 18 31 40 7 9 38 54 10 114 0 0 39 52 24 19 44 34 5 243 -26 40 4 27 39 40 21 40 28 51 39 16 5 115 0 0 40 13 46 19 44 33 4 244 -25 40 25 47 40 1 46 40 50 7 39 37 33 116 0 0 40 34 42 19 44 32 4 244 -24 40 46 41 40 22 43 41 10 56 39 58 35 117 0 0 40 55 11 19 44 31 3 245 -23 41 7 8 40 43 15 41 31 19 40 19 11 118 0 0 41 15 13 19 44 31 2 246 -22 41 27 8 41 3 19 41 51 15 40 39 20 119 0 0 41 34 49 19 44 30 1 246 -21 41 46 42 41 22 58 42 10 45 40 59 2 120 0 0 41 53 59 19 44 30 0 247 -21 42 5 50 41 42 9 42 29 48 41 18 18 Uncertainty in time = +/- 7 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6377-00353-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 07 50.4018 DE: -16 46 48.713 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .045, .034 ) * V mag [mag]: 11.0 * B mag [mag]: 12.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (877) Walkure approx. diameter [km]: 38 approx. diameter ["]: .042 distance from Earth [AU]: 1.25000 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 987 number of rejected observations: 62 time covered by the observations: 1921 Feb 25 - 2008 Feb 12 1 sigma uncertainty ellipse (major, minor, PA): 0.042, 0.022, 74° remarks: * orbital elements for (877) Walkure : Mean anomaly = 318.93961616 deg Arg. of pericenter = 275.67932789 deg Long. of node = 116.43126772 deg Inclination = 4.25629496 deg Eccentricity = 0.15968825 Semimajor axis = 2.48766395 AU Perihelion dist = 2.09041323 AU Mag: H = 10.75, G = 0.15 Epoch of elements : MJD 55084.83200000 TDT (2009 Sep 10.832) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 10 877 Walkure 19h 58.0m UT 11.0 22 7 50.402-16 46 48.71TYC 6377-00353-1 12.1 13.5 38 5.1 1.250 -1.860 -12.77 42.4810 -16.776 -120.29 4.65 19.9664 -0.13734 0.28718 -3.79965 -1.81638 0.00155 0.00104 2000 317.7258262009 9 6.00000275.679328116.431268 4.2562950.15968825 2.4876640 2.090413210.7 5.00.15 RATE 2.5119820 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.061 0.040 83 2.01 0.042 0 54545.5020090910_0353-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 13:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org