IOTA/IOTA-ES occultation update for (2976) Lautaro / TYC 0812-00635-1 event on 2009 Oct 02, 19:13 UT Visible from Summary ------- On 2009 Oct 02 UT, the 40 km diameter asteroid (2976) Lautaro will occult a 9.2 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.0 mag to 17.2 mag (the magnitude of the asteroid) for at most 1.2 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: 24 * date and approx. time of event: 2009 Oct 02, 19:10 - 2009 Oct 02, 19:11 UT * magnitude of target star: 9.2 * magnitude drop [mag]: 8.0 * estimated maximum duration [s]: 1.2 * Moon: 98 % sunlit, 144° distance * Sun: 54° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 2.75 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .069 +/- .042) * 1 sigma uncertainty ellipse (major, minor, PA): ( .070", .040", 102° ) * approx speed of asteroid's shadow [km/s]: 32.7870 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0812-00635-1 by 2976 Lautaro on 2009 Oct 2 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 102 0 0 35 3 46 19 10 15 0 81 -47 34 52 29 35 15 4 .. .. .. 36 17 20 103 0 0 35 11 46 19 10 15 1 81 -46 35 0 30 35 23 3 .. .. .. 36 25 15 104 0 0 35 19 26 19 10 15 2 82 -45 35 8 10 35 30 42 34 6 24 36 32 50 105 0 0 35 26 45 19 10 15 3 82 -45 35 15 30 35 38 0 34 13 47 36 40 4 106 0 0 35 33 43 19 10 15 4 83 -44 35 22 29 35 44 57 34 20 50 36 46 58 107 0 0 35 40 21 19 10 15 4 84 -43 35 29 7 35 51 35 34 27 32 36 53 31 108 0 0 35 46 38 19 10 16 5 84 -42 35 35 25 35 57 51 34 33 53 36 59 45 109 0 0 35 52 34 19 10 16 6 85 -42 35 41 22 36 3 47 34 39 53 37 5 38 110 0 0 35 58 10 19 10 16 7 85 -41 35 46 59 36 9 23 34 45 33 37 11 10 111 0 0 36 3 26 19 10 17 8 86 -40 35 52 15 36 14 38 34 50 51 37 16 22 112 0 0 36 8 21 19 10 17 8 86 -40 35 57 10 36 19 32 34 55 50 37 21 14 113 0 0 36 12 55 19 10 17 9 87 -39 36 1 45 36 24 6 35 0 27 37 25 46 114 0 0 36 17 9 19 10 18 10 88 -38 36 6 0 36 28 20 35 4 44 37 29 57 115 0 0 36 21 3 19 10 18 11 88 -37 36 9 53 36 32 13 35 8 40 37 33 48 116 0 0 36 24 36 19 10 19 12 89 -37 36 13 27 36 35 46 35 12 15 37 37 18 117 0 0 36 27 48 19 10 20 13 89 -36 36 16 39 36 38 58 35 15 30 37 40 29 118 0 0 36 30 40 19 10 20 13 90 -35 36 19 32 36 41 49 35 18 23 37 43 19 119 0 0 36 33 12 19 10 21 14 91 -34 36 22 3 36 44 20 35 20 56 37 45 48 120 0 0 36 35 23 19 10 22 15 91 -34 36 24 14 36 46 31 35 23 9 37 47 58 121 0 0 36 37 13 19 10 22 16 92 -33 36 26 5 36 48 21 35 25 0 37 49 47 122 0 0 36 38 43 19 10 23 17 93 -32 36 27 35 36 49 51 35 26 31 37 51 16 123 0 0 36 39 52 19 10 24 17 93 -31 36 28 45 36 51 0 35 27 41 37 52 24 124 0 0 36 40 41 19 10 25 18 94 -31 36 29 33 36 51 49 35 28 31 37 53 12 125 0 0 36 41 9 19 10 26 19 94 -30 36 30 2 36 52 17 35 29 0 37 53 40 126 0 0 36 41 17 19 10 27 20 95 -29 36 30 10 36 52 25 35 29 7 37 53 48 127 0 0 36 41 4 19 10 28 21 96 -28 36 29 57 36 52 12 35 28 55 37 53 35 128 0 0 36 40 31 19 10 29 21 96 -27 36 29 23 36 51 39 35 28 21 37 53 2 129 0 0 36 39 37 19 10 30 22 97 -27 36 28 29 36 50 45 35 27 27 37 52 9 130 0 0 36 38 22 19 10 31 23 97 -26 36 27 15 36 49 31 35 26 11 37 50 55 131 0 0 36 36 47 19 10 32 24 98 -25 36 25 40 36 47 56 35 24 35 37 49 21 132 0 0 36 34 52 19 10 33 25 99 -24 36 23 44 36 46 0 35 22 38 37 47 26 133 0 0 36 32 35 19 10 34 25 99 -24 36 21 27 36 43 44 35 20 21 37 45 11 134 0 0 36 29 58 19 10 35 26 100 -23 36 18 50 36 41 7 35 17 42 37 42 36 135 0 0 36 27 1 19 10 37 27 101 -22 36 15 52 36 38 10 35 14 43 37 39 40 136 0 0 36 23 42 19 10 38 28 101 -21 36 12 33 36 34 52 35 11 22 37 36 24 137 0 0 36 20 3 19 10 39 29 102 -20 36 8 54 36 31 13 35 7 41 37 32 47 138 0 0 36 16 3 19 10 41 29 103 -20 36 4 54 36 27 14 35 3 39 37 28 50 139 0 0 36 11 43 19 10 42 30 103 -19 36 0 33 36 22 53 34 59 15 37 24 32 140 0 0 36 7 1 19 10 44 31 104 -18 35 55 51 36 18 13 34 54 31 37 19 53 141 0 0 36 1 59 19 10 45 32 105 -17 35 50 48 36 13 11 34 49 26 37 14 54 142 0 0 35 56 36 19 10 47 33 105 -17 35 45 25 36 7 48 34 44 0 37 9 35 143 0 0 35 50 53 19 10 48 33 106 -16 35 39 40 36 2 5 34 38 12 37 3 54 144 0 0 35 44 48 19 10 50 34 107 -15 35 33 35 35 56 1 34 32 4 36 57 54 145 0 0 35 38 22 19 10 51 35 107 -14 35 27 9 35 49 36 34 25 34 36 51 32 146 0 0 35 31 36 19 10 53 36 108 -13 35 20 22 35 42 50 34 18 44 36 44 50 147 0 0 35 24 28 19 10 55 37 109 -12 35 13 14 35 35 43 34 11 32 36 37 46 148 0 0 35 17 0 19 10 56 38 109 -12 35 5 44 35 28 16 34 3 59 36 30 23 149 0 0 35 9 10 19 10 58 38 110 -11 34 57 54 35 20 27 33 56 5 36 22 38 150 0 0 35 1 0 19 11 0 39 111 -10 34 49 43 35 12 17 33 47 50 36 14 32 151 0 0 34 52 28 19 11 2 40 111 -9 34 41 11 35 3 47 33 39 13 36 6 6 152 0 0 34 43 36 19 11 4 41 112 -8 34 32 17 34 54 55 33 30 15 35 57 19 153 0 0 34 34 22 19 11 6 42 113 -8 34 23 3 34 45 42 33 20 56 35 48 11 154 0 0 34 24 48 19 11 8 42 114 -7 34 13 27 34 36 8 33 11 16 35 38 41 155 0 0 34 14 52 19 11 10 43 114 -6 34 3 31 34 26 13 33 1 15 35 28 51 156 0 0 34 4 35 19 11 12 44 115 -5 33 53 13 34 15 57 32 50 52 35 18 40 157 0 0 33 53 57 19 11 14 45 116 -4 33 42 34 34 5 20 32 40 8 35 8 9 158 0 0 33 42 58 19 11 16 46 117 -3 33 31 34 33 54 22 32 29 3 34 57 16 159 0 0 33 31 37 19 11 18 47 117 -3 33 20 13 33 43 3 32 17 36 34 46 2 160 0 0 33 19 56 19 11 20 47 118 -2 33 8 30 33 31 22 32 5 48 34 34 27 161 0 0 33 7 54 19 11 23 48 119 -1 32 56 27 33 19 21 31 53 39 34 22 31 Uncertainty in time = +/- 6 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 0812-00635-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 04 57.8156 DE: +07 49 29.944 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .022 ) * V mag [mag]: 9.2 * B mag [mag]: 9.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2976) Lautaro approx. diameter [km]: 40 approx. diameter ["]: .015 distance from Earth [AU]: 3.78500 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 642 number of rejected observations: 30 time covered by the observations: 1903 Oct 27 - 2007 Dec 19 1 sigma uncertainty ellipse (major, minor, PA): 0.066, 0.034, 104° remarks: * orbital elements for (2976) Lautaro : Mean anomaly = 75.89050173 deg Arg. of pericenter = 182.55447038 deg Long. of node = 207.02008983 deg Inclination = 9.80660722 deg Eccentricity = 0.14397209 Semimajor axis = 3.34233510 AU Perihelion dist = 2.86113212 AU Mag: H = 10.63, G = 0.15 Epoch of elements : MJD 55106.80100000 TDT (2009 Oct 02.801) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 2 2976 Lautaro 19h 13.4m UT 9.2 9 4 57.816 7 49 29.94TYC 0812-00635-1 9.4 17.2 40 1.2 3.785 2.687 -15.94 -163.7451 7.830 -111.04 -3.86 19.2233 0.08695 0.21556 17.18727 -6.86040 -0.00462 0.00086 2000 74.7935142009 926.00000182.554470207.020090 9.8066070.14397209 3.3423351 2.861132110.9 5.00.15 RATE 1.6129800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.070 0.040 102 3.75 0.040 0 54581.5020091002_0635-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org