IOTA/IOTA-ES occultation update for (141) Lumen / TYC 0835-00221-1 event on 2009 Oct 11, 00:09 UT Visible from Summary ------- On 2009 Oct 11 UT, the 120 km diameter asteroid (141) Lumen will occult a 10.4 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 3.5 mag to 13.9 mag (the magnitude of the asteroid) for at most 3.6 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: 92 * date and approx. time of event: 2009 Oct 11, 00:07 - 2009 Oct 11, 00:07 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 3.6 * Moon: 54 % sunlit, 44° distance * Sun: 51° distance * rough path description: Additional comments ------------------- 7.5" double star The occultation path -------------------- * approximate projected width [km]: 137 * 1 sigma uncertainty interval [path widths]: +/- 0.49 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .024", .023", 3° ) * approx speed of asteroid's shadow [km/s]: 33.5285 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0835-00221-1 by 141 Lumen on 2009 Oct 11 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 20 0 0 52 6 28 0 7 0 0 67 -40 .. .. .. 52 46 52 .. .. .. 53 26 44 21 0 0 52 21 49 0 7 0 1 68 -40 51 41 50 53 2 5 51 2 54 53 41 49 22 0 0 52 36 45 0 7 0 2 69 -39 51 56 54 53 16 54 51 18 5 53 56 31 23 0 0 52 51 18 0 7 0 2 70 -39 52 11 33 53 31 19 51 32 52 54 10 49 24 0 0 53 5 27 0 7 0 3 71 -38 52 25 49 53 45 21 51 47 15 54 24 43 25 0 0 53 19 12 0 7 1 4 71 -38 52 39 42 53 58 58 52 1 14 54 38 13 26 0 0 53 32 34 0 7 1 4 72 -37 52 53 11 54 12 13 52 14 49 54 51 21 27 0 0 53 45 32 0 7 1 5 73 -37 53 6 16 54 25 4 52 28 1 55 4 5 28 0 0 53 58 8 0 7 1 5 74 -36 53 18 58 54 37 33 52 40 50 55 16 27 29 0 0 54 10 20 0 7 1 6 75 -36 53 31 17 54 49 39 52 53 16 55 28 26 30 0 0 54 22 10 0 7 2 7 75 -35 53 43 14 55 1 22 53 5 19 55 40 2 31 0 0 54 33 38 0 7 2 7 76 -34 53 54 48 55 12 43 53 16 59 55 51 17 32 0 0 54 44 43 0 7 2 8 77 -34 54 5 59 55 23 42 53 28 16 56 2 9 33 0 0 54 55 26 0 7 3 8 78 -33 54 16 49 55 34 19 53 39 11 56 12 40 34 0 0 55 5 47 0 7 3 9 79 -33 54 27 16 55 44 34 53 49 44 56 22 49 35 0 0 55 15 47 0 7 3 10 80 -32 54 37 21 55 54 27 53 59 55 56 32 36 36 0 0 55 25 25 0 7 4 10 80 -32 54 47 5 56 4 0 54 9 45 56 42 3 37 0 0 55 34 42 0 7 4 11 81 -31 54 56 27 56 13 11 54 19 12 56 51 8 38 0 0 55 43 37 0 7 5 11 82 -31 55 5 28 56 22 1 54 28 18 56 59 53 39 0 0 55 52 12 0 7 5 12 83 -30 55 14 8 56 30 30 54 37 3 57 8 17 40 0 0 56 0 25 0 7 5 13 84 -30 55 22 26 56 38 38 54 45 27 57 16 20 41 0 0 56 8 18 0 7 6 13 85 -29 55 30 24 56 46 27 54 53 29 57 24 3 42 0 0 56 15 51 0 7 6 14 85 -28 55 38 2 56 53 54 55 1 11 57 31 26 43 0 0 56 23 3 0 7 7 14 86 -28 55 45 18 57 1 2 55 8 32 57 38 29 44 0 0 56 29 55 0 7 8 15 87 -27 55 52 15 57 7 50 55 15 33 57 45 12 45 0 0 56 36 27 0 7 8 15 88 -27 55 58 51 57 14 17 55 22 13 57 51 36 46 0 0 56 42 39 0 7 9 16 89 -26 56 5 7 57 20 25 55 28 33 57 57 40 47 0 0 56 48 32 0 7 9 16 90 -26 56 11 3 57 26 14 55 34 32 58 3 25 48 0 0 56 54 4 0 7 10 17 91 -25 56 16 39 57 31 43 55 40 12 58 8 50 49 0 0 56 59 17 0 7 11 18 91 -25 56 21 56 57 36 52 55 45 32 58 13 56 50 0 0 57 4 11 0 7 11 18 92 -24 56 26 53 57 41 43 55 50 32 58 18 43 51 0 0 57 8 45 0 7 12 19 93 -24 56 31 30 57 46 14 55 55 12 58 23 11 52 0 0 57 13 0 0 7 13 19 94 -23 56 35 48 57 50 26 55 59 33 58 27 21 53 0 0 57 16 56 0 7 13 20 95 -23 56 39 47 57 54 20 56 3 34 58 31 11 54 0 0 57 20 33 0 7 14 20 96 -22 56 43 26 57 57 54 56 7 16 58 34 44 55 0 0 57 23 51 0 7 15 21 97 -22 56 46 46 58 1 10 56 10 38 58 37 57 56 0 0 57 26 51 0 7 15 21 98 -21 56 49 47 58 4 7 56 13 41 58 40 52 57 0 0 57 29 31 0 7 16 22 98 -21 56 52 30 58 6 45 56 16 25 58 43 29 58 0 0 57 31 53 0 7 17 22 99 -20 56 54 53 58 9 5 56 18 50 58 45 47 59 0 0 57 33 55 0 7 18 23 100 -20 56 56 57 58 11 7 56 20 55 58 47 47 60 0 0 57 35 40 0 7 19 23 101 -19 56 58 42 58 12 50 56 22 42 58 49 29 61 0 0 57 37 5 0 7 19 24 102 -19 57 0 9 58 14 14 56 24 10 58 50 52 62 0 0 57 38 12 0 7 20 24 103 -18 57 1 17 58 15 20 56 25 18 58 51 58 63 0 0 57 39 1 0 7 21 25 104 -18 57 2 6 58 16 8 56 26 8 58 52 45 64 0 0 57 39 30 0 7 22 26 105 -17 57 2 36 58 16 38 56 26 38 58 53 14 65 0 0 57 39 42 0 7 23 26 106 -16 57 2 48 58 16 49 56 26 50 58 53 25 66 0 0 57 39 34 0 7 24 27 107 -16 57 2 40 58 16 42 56 26 43 58 53 17 67 0 0 57 39 9 0 7 25 27 107 -15 57 2 14 58 16 16 56 26 17 58 52 52 68 0 0 57 38 24 0 7 26 28 108 -15 57 1 30 58 15 32 56 25 31 58 52 9 69 0 0 57 37 21 0 7 27 28 109 -14 57 0 26 58 14 30 56 24 27 58 51 7 70 0 0 57 36 0 0 7 28 29 110 -14 56 59 3 58 13 9 56 23 4 58 49 47 71 0 0 57 34 19 0 7 29 29 111 -13 56 57 22 58 11 30 56 21 22 58 48 9 72 0 0 57 32 20 0 7 30 30 112 -13 56 55 22 58 9 32 56 19 20 58 46 12 73 0 0 57 30 3 0 7 31 30 113 -12 56 53 3 58 7 16 56 17 0 58 43 58 74 0 0 57 27 26 0 7 32 31 114 -12 56 50 25 58 4 41 56 14 20 58 41 25 75 0 0 57 24 31 0 7 33 31 115 -11 56 47 27 58 1 48 56 11 21 58 38 33 76 0 0 57 21 17 0 7 34 32 116 -11 56 44 11 57 58 35 56 8 2 58 35 23 77 0 0 57 17 43 0 7 35 32 117 -10 56 40 35 57 55 4 56 4 25 58 31 54 78 0 0 57 13 51 0 7 36 33 118 -10 56 36 40 57 51 14 56 0 27 58 28 7 79 0 0 57 9 39 0 7 37 33 119 -9 56 32 26 57 47 5 55 56 10 58 24 0 80 0 0 57 5 8 0 7 38 34 120 -8 56 27 52 57 42 37 55 51 34 58 19 35 81 0 0 57 0 18 0 7 39 34 121 -8 56 22 59 57 37 50 55 46 37 58 14 51 82 0 0 56 55 8 0 7 41 35 122 -7 56 17 46 57 32 43 55 41 21 58 9 48 83 0 0 56 49 38 0 7 42 35 123 -7 56 12 13 57 27 17 55 35 45 58 4 25 84 0 0 56 43 49 0 7 43 36 124 -6 56 6 19 57 21 32 55 29 48 57 58 43 85 0 0 56 37 39 0 7 44 36 125 -6 56 0 6 57 15 26 55 23 31 57 52 42 86 0 0 56 31 10 0 7 46 37 126 -5 55 53 33 57 9 1 55 16 54 57 46 21 87 0 0 56 24 20 0 7 47 37 127 -5 55 46 39 57 2 16 55 9 56 57 39 40 88 0 0 56 17 10 0 7 48 38 128 -4 55 39 25 56 55 10 55 2 37 57 32 39 89 0 0 56 9 40 0 7 50 38 129 -3 55 31 50 56 47 44 54 54 58 57 25 17 90 0 0 56 1 49 0 7 51 39 130 -3 55 23 54 56 39 58 54 46 57 57 17 36 91 0 0 55 53 37 0 7 52 39 131 -2 55 15 37 56 31 51 54 38 36 57 9 34 92 0 0 55 45 4 0 7 54 40 132 -2 55 6 58 56 23 23 54 29 52 57 1 11 93 0 0 55 36 9 0 7 55 40 133 -1 54 57 59 56 14 34 54 20 48 56 52 28 94 0 0 55 26 54 0 7 57 41 134 -1 54 48 38 56 5 24 54 11 21 56 43 23 Uncertainty in time = +/- 2 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 0835-00221-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 57 32.6494 DE: +13 58 42.756 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .023 ) * V mag [mag]: 10.4 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (141) Lumen approx. diameter [km]: 120 approx. diameter ["]: .050 distance from Earth [AU]: 3.30100 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 595 number of rejected observations: 85 time covered by the observations: 1918 Jan 15 - 2007 Aug 04 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.008, 123° remarks: * orbital elements for (141) Lumen : Mean anomaly = 89.93735793 deg Arg. of pericenter = 58.08444687 deg Long. of node = 318.57898628 deg Inclination = 11.88739309 deg Eccentricity = 0.21269248 Semimajor axis = 2.66725153 AU Perihelion dist = 2.09994718 AU Mag: H = 8.33, G = 0.15 Epoch of elements : MJD 55115.00700000 TDT (2009 Oct 11.007) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 11 141 Lumen 0h 9.8m UT 10.4 9 57 32.649 13 58 42.76TYC 0835-00221-1 11.5 13.9 120 3.6 3.301 3.135 -21.42 127.2181 13.985 174.27 -6.99 0.1629 0.20586 0.43706 17.13150 -8.04026 -0.00416 0.00161 2000 88.804473200910 6.00000 58.084447318.578986 11.8873930.21269248 2.6672515 2.0999472 8.2 5.00.15 RATE 2.2626020 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.024 0.023 3 1.49 0.024 0 54581.5020091011_0221-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org