IOTA/IOTA-ES occultation update for (811) Nauheima / TYC 0019-00419-1 event on 2009 Oct 10, 03:12 UT Visible from Summary ------- On 2009 Oct 10 UT, the 24 km diameter asteroid (811) Nauheima will occult a 10.4 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 4.1 mag to 14.5 mag (the magnitude of the asteroid) for at most 2.0 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 Oct 10, 03:05 - 2009 Oct 10, 03:19 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 4.1 * estimated maximum duration [s]: 2.0 * Moon: 63 % sunlit, 77° distance * Sun: 175° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 1.76 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .046 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .031", 73° ) * approx speed of asteroid's shadow [km/s]: 11.7046 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0019-00419-1 by 811 Nauheima on 2009 Oct 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 -143 0 0 15 41 33 3 19 53 1 88 -2 15 50 1 15 33 6 16 19 58 .. .. .. -142 0 0 15 44 11 3 19 53 1 88 -3 15 52 40 15 35 44 16 22 37 .. .. .. -141 0 0 15 47 21 3 19 52 2 89 -4 15 55 50 15 38 54 16 25 48 .. .. .. -140 0 0 15 51 4 3 19 52 3 89 -5 15 59 32 15 42 36 16 29 30 .. .. .. -139 0 0 15 55 17 3 19 51 4 89 -6 16 3 46 15 46 50 16 33 45 .. .. .. -138 0 0 16 0 3 3 19 50 5 89 -7 16 8 32 15 51 35 16 38 32 15 21 55 -137 0 0 16 5 20 3 19 49 6 90 -8 16 13 49 15 56 52 16 43 51 15 27 11 -136 0 0 16 11 9 3 19 47 7 90 -9 16 19 38 16 2 40 16 49 41 15 32 58 -135 0 0 16 17 29 3 19 46 8 90 -10 16 25 59 16 8 59 16 56 2 15 39 16 -134 0 0 16 24 19 3 19 44 9 91 -11 16 32 50 16 15 50 17 2 55 15 46 5 -133 0 0 16 31 41 3 19 42 10 91 -12 16 40 12 16 23 11 17 10 20 15 53 25 -132 0 0 16 39 34 3 19 40 11 91 -13 16 48 6 16 31 4 17 18 15 16 1 15 -131 0 0 16 47 58 3 19 37 12 92 -13 16 56 30 16 39 27 17 26 41 16 9 36 -130 0 0 16 56 51 3 19 35 13 92 -14 17 5 24 16 48 20 17 35 37 16 18 27 -129 0 0 17 6 16 3 19 32 14 92 -15 17 14 49 16 57 43 17 45 4 16 27 49 -128 0 0 17 16 10 3 19 29 15 93 -16 17 24 44 17 7 37 17 55 2 16 37 40 -127 0 0 17 26 34 3 19 26 16 93 -17 17 35 9 17 18 1 18 5 29 16 48 1 -126 0 0 17 37 28 3 19 23 17 93 -18 17 46 3 17 28 54 18 16 26 16 58 52 -125 0 0 17 48 51 3 19 19 18 94 -19 17 57 28 17 40 16 18 27 53 17 10 11 -124 0 0 18 0 44 3 19 15 19 94 -20 18 9 21 17 52 8 18 39 50 17 22 0 -123 0 0 18 13 6 3 19 12 19 94 -21 18 21 44 18 4 29 18 52 16 17 34 18 -122 0 0 18 25 56 3 19 8 20 95 -22 18 34 35 18 17 19 19 5 10 17 47 5 -121 0 0 18 39 16 3 19 3 21 95 -23 18 47 55 18 30 37 19 18 34 18 0 20 -120 0 0 18 53 3 3 18 59 22 96 -24 19 1 44 18 44 23 19 32 25 18 14 3 -119 0 0 19 7 18 3 18 54 23 96 -25 19 16 0 18 58 38 19 46 45 18 28 14 -118 0 0 19 22 2 3 18 50 24 97 -26 19 30 44 19 13 20 20 1 33 18 42 53 -117 0 0 19 37 12 3 18 45 25 97 -27 19 45 56 19 28 30 20 16 49 18 57 59 -116 0 0 19 52 50 3 18 40 26 98 -28 20 1 35 19 44 7 20 32 32 19 13 32 -115 0 0 20 8 55 3 18 34 27 98 -28 20 17 41 20 0 10 20 48 42 19 29 32 -114 0 0 20 25 27 3 18 29 27 99 -29 20 34 14 20 16 41 21 5 19 19 45 58 -113 0 0 20 42 24 3 18 24 28 99 -30 20 51 13 20 33 37 21 22 22 20 2 51 -112 0 0 20 59 48 3 18 18 29 100 -31 21 8 38 20 51 0 21 39 51 20 20 9 -111 0 0 21 17 37 3 18 12 30 100 -32 21 26 28 21 8 48 21 57 46 20 37 53 -110 0 0 21 35 52 3 18 6 31 101 -33 21 44 44 21 27 1 22 16 6 20 56 2 -109 0 0 21 54 31 3 18 0 32 102 -34 22 3 24 21 45 39 22 34 51 21 14 35 -108 0 0 22 13 35 3 17 54 32 102 -35 22 22 29 22 4 41 22 54 1 21 33 33 -107 0 0 22 33 3 3 17 47 33 103 -35 22 41 59 22 24 8 23 13 35 21 52 55 -106 0 0 22 52 54 3 17 41 34 104 -36 23 1 51 22 43 58 23 33 32 22 12 41 -105 0 0 23 13 9 3 17 34 35 105 -37 23 22 7 23 4 11 23 53 53 22 32 49 -104 0 0 23 33 46 3 17 27 36 105 -38 23 42 46 23 24 47 24 14 37 22 53 21 -103 0 0 23 54 46 3 17 20 36 106 -39 24 3 47 23 45 46 24 35 43 23 14 14 -102 0 0 24 16 8 3 17 13 37 107 -40 24 25 11 24 7 6 24 57 12 23 35 30 -101 0 0 24 37 51 3 17 6 38 108 -40 24 46 55 24 28 48 25 19 1 23 57 6 -100 0 0 24 59 55 3 16 59 39 109 -41 25 9 0 24 50 50 25 41 12 24 19 4 - 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Uncertainty in time = +/- 5 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 0019-00419-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 02 48.5695 DE: +01 54 23.827 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .024 ) * V mag [mag]: 10.4 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (811) Nauheima approx. diameter [km]: 24 approx. diameter ["]: .018 distance from Earth [AU]: 1.79800 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1029 number of rejected observations: 58 time covered by the observations: 1915 Sep 08 - 2007 Jul 25 1 sigma uncertainty ellipse (major, minor, PA): 0.042, 0.021, 69° remarks: * orbital elements for (811) Nauheima : Mean anomaly = 58.60499156 deg Arg. of pericenter = 178.54016315 deg Long. of node = 130.92860321 deg Inclination = 3.13890124 deg Eccentricity = 0.07549171 Semimajor axis = 2.89530665 AU Perihelion dist = 2.67673499 AU Mag: H = 10.63, G = 0.15 Epoch of elements : MJD 55114.13400000 TDT (2009 Oct 10.134) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 10 811 Nauheima 3h 12.9m UT 10.4 1 2 48.570 1 54 23.83TYC 0019-00419-1 10.8 14.5 24 2.0 1.798 -1.968 -13.17 -51.3848 1.911 128.55 -6.66 3.2148 -0.25992 0.58235 -6.03281 -2.69259 -0.00005 0.00046 2000 57.777940200910 6.00000178.540163130.928603 3.1389010.07549171 2.8953067 2.676735010.8 5.00.15 RATE 2.0006090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.031 73 2.76 0.032 0 54581.5020091010_0419-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org