IOTA/IOTA-ES occultation update for (205) Martha / UCAC2 38385660 event on 2009 Sep 05, 07:31 UT Visible from Summary ------- On 2009 Sep 05 UT, the 78 km diameter asteroid (205) Martha will occult a 11.8 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 14.5 mag (the magnitude of the asteroid) for at most 4.4 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: 71 * date and approx. time of event: 2009 Sep 05, 07:25 - 2009 Sep 05, 07:31 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 4.4 * Moon: 99 % sunlit, 85° distance * Sun: 88° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 79 * 1 sigma uncertainty interval [path widths]: +/- 0.81 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .034", 0° ) * approx speed of asteroid's shadow [km/s]: 17.8685 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 38385660 by 205 Martha on 2009 Sep 5 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 -118 0 0 19 1 6 7 25 41 1 71 -64 18 38 14 19 23 59 18 1 17 20 1 7 -117 0 0 19 21 15 7 25 41 2 71 -63 18 58 25 19 44 7 18 21 29 20 21 14 -116 0 0 19 41 13 7 25 41 3 71 -63 19 18 24 20 4 4 18 41 31 20 41 8 -115 0 0 20 0 59 7 25 42 4 72 -63 19 38 12 20 23 49 19 1 20 21 0 51 -114 0 0 20 20 33 7 25 42 5 72 -63 19 57 47 20 43 21 19 20 57 21 20 22 -113 0 0 20 39 55 7 25 43 6 72 -63 20 17 10 21 2 42 19 40 22 21 39 40 -112 0 0 20 59 3 7 25 44 7 73 -62 20 36 20 21 21 49 19 59 34 21 58 45 -111 0 0 21 17 59 7 25 44 8 73 -62 20 55 17 21 40 43 20 18 33 22 17 36 -110 0 0 21 36 41 7 25 45 9 73 -62 21 14 0 21 59 23 20 37 19 22 36 14 -109 0 0 21 55 8 7 25 46 10 74 -61 21 32 29 22 17 50 20 55 51 22 54 38 -108 0 0 22 13 22 7 25 47 11 74 -61 21 50 44 22 36 2 21 14 8 23 12 48 -107 0 0 22 31 21 7 25 49 12 75 -60 22 8 45 22 53 59 21 32 12 23 30 43 -106 0 0 22 49 6 7 25 50 13 75 -60 22 26 31 23 11 42 21 50 0 23 48 24 -105 0 0 23 6 35 7 25 51 14 75 -60 22 44 2 23 29 10 22 7 33 24 5 49 -104 0 0 23 23 49 7 25 53 15 76 -59 23 1 17 23 46 22 22 24 52 24 22 59 -103 0 0 23 40 47 7 25 54 16 76 -58 23 18 17 24 3 19 22 41 54 24 39 53 -102 0 0 23 57 30 7 25 56 16 77 -58 23 35 2 24 20 0 22 58 41 24 56 31 -101 0 0 24 13 56 7 25 58 17 77 -57 23 51 30 24 36 25 23 15 12 25 12 53 -100 0 0 24 30 7 7 26 0 18 77 -57 24 7 42 24 52 33 23 31 26 25 28 59 - 99 0 0 24 46 0 7 26 2 19 78 -56 24 23 37 25 8 25 23 47 24 25 44 48 - 98 0 0 25 1 37 7 26 4 20 78 -56 24 39 15 25 24 0 24 3 5 26 0 20 - 97 0 0 25 16 57 7 26 6 21 79 -55 24 54 37 25 39 19 24 18 30 26 15 36 - 96 0 0 25 32 0 7 26 8 22 79 -54 25 9 41 25 54 20 24 33 37 26 30 34 - 95 0 0 25 46 45 7 26 10 23 80 -54 25 24 28 26 9 3 24 48 27 26 45 15 - 94 0 0 26 1 13 7 26 13 24 80 -53 25 38 58 26 23 30 25 2 59 26 59 39 - 93 0 0 26 15 23 7 26 15 25 81 -52 25 53 10 26 37 38 25 17 14 27 13 44 - 92 0 0 26 29 16 7 26 18 26 81 -52 26 7 4 26 51 29 25 31 10 27 27 32 - 91 0 0 26 42 50 7 26 20 27 82 -51 26 20 40 27 5 2 25 44 49 27 41 2 - 90 0 0 26 56 6 7 26 23 28 82 -50 26 33 58 27 18 16 25 58 10 27 54 14 - 89 0 0 27 9 5 7 26 26 29 83 -50 26 46 58 27 31 13 26 11 12 28 7 8 - 88 0 0 27 21 44 7 26 29 30 83 -49 26 59 39 27 43 51 26 23 56 28 19 44 - 87 0 0 27 34 6 7 26 32 31 84 -48 27 12 2 27 56 11 26 36 22 28 32 0 - 86 0 0 27 46 8 7 26 35 31 84 -47 27 24 6 28 8 12 26 48 29 28 43 59 - 85 0 0 27 57 52 7 26 38 32 85 -47 27 35 52 28 19 54 27 0 17 28 55 39 - 84 0 0 28 9 17 7 26 41 33 85 -46 27 47 19 28 31 17 27 11 46 29 7 0 - 83 0 0 28 20 23 7 26 44 34 86 -45 27 58 26 28 42 22 27 22 56 29 18 2 - 82 0 0 28 31 11 7 26 47 35 86 -44 28 9 15 28 53 8 27 33 47 29 28 45 - 81 0 0 28 41 39 7 26 51 36 87 -44 28 19 45 29 3 34 27 44 19 29 39 9 - 80 0 0 28 51 48 7 26 54 37 88 -43 28 29 55 29 13 42 27 54 32 29 49 14 - 79 0 0 29 1 37 7 26 58 38 88 -42 28 39 46 29 23 30 28 4 25 29 59 0 - 78 0 0 29 11 8 7 27 1 39 89 -41 28 49 18 29 32 59 28 13 59 30 8 27 - 77 0 0 29 20 19 7 27 5 40 89 -41 28 58 31 29 42 9 28 23 14 30 17 34 - 76 0 0 29 29 11 7 27 8 40 90 -40 29 7 24 29 50 59 28 32 9 30 26 23 - 75 0 0 29 37 43 7 27 12 41 91 -39 29 15 57 29 59 30 28 40 45 30 34 51 - 74 0 0 29 45 56 7 27 16 42 91 -38 29 24 11 30 7 42 28 49 1 30 43 1 - 73 0 0 29 53 49 7 27 20 43 92 -38 29 32 5 30 15 33 28 56 57 30 50 51 - 72 0 0 30 1 22 7 27 24 44 93 -37 29 39 40 30 23 6 29 4 34 30 58 21 - 71 0 0 30 8 36 7 27 28 45 93 -36 29 46 55 30 30 18 29 11 50 31 5 32 - 70 0 0 30 15 30 7 27 32 46 94 -35 29 53 50 30 37 12 29 18 47 31 12 23 - 69 0 0 30 22 5 7 27 36 47 95 -34 30 0 26 30 43 45 29 25 25 31 18 55 - 68 0 0 30 28 19 7 27 40 47 95 -34 30 6 41 30 49 59 29 31 42 31 25 7 - 67 0 0 30 34 14 7 27 44 48 96 -33 30 12 37 30 55 52 29 37 39 31 30 59 - 66 0 0 30 39 49 7 27 48 49 97 -32 30 18 13 31 1 27 29 43 17 31 36 32 - 65 0 0 30 45 4 7 27 52 50 97 -31 30 23 29 31 6 41 29 48 34 31 41 45 - 64 0 0 30 50 0 7 27 57 51 98 -31 30 28 25 31 11 35 29 53 32 31 46 38 - 63 0 0 30 54 35 7 28 1 52 99 -30 30 33 2 31 16 10 29 58 9 31 51 11 - 62 0 0 30 58 51 7 28 5 53 100 -29 30 37 18 31 20 25 30 2 26 31 55 25 - 61 0 0 31 2 46 7 28 10 53 101 -28 30 41 14 31 24 20 30 6 24 31 59 19 - 60 0 0 31 6 22 7 28 14 54 101 -27 30 44 50 31 27 55 30 10 1 32 2 53 - 59 0 0 31 9 38 7 28 19 55 102 -27 30 48 7 31 31 10 30 13 18 32 6 7 - 58 0 0 31 12 33 7 28 23 56 103 -26 30 51 3 31 34 5 30 16 15 32 9 2 - 57 0 0 31 15 9 7 28 28 57 104 -25 30 53 39 31 36 41 30 18 52 32 11 36 - 56 0 0 31 17 25 7 28 33 58 105 -24 30 55 55 31 38 56 30 21 9 32 13 51 - 55 0 0 31 19 21 7 28 37 58 106 -23 30 57 51 31 40 51 30 23 5 32 15 46 - 54 0 0 31 20 56 7 28 42 59 107 -23 30 59 27 31 42 27 30 24 42 32 17 21 - 53 0 0 31 22 12 7 28 47 60 108 -22 31 0 43 31 43 42 30 25 58 32 18 36 - 52 0 0 31 23 7 7 28 52 61 109 -21 31 1 39 31 44 37 30 26 54 32 19 31 - 51 0 0 31 23 43 7 28 57 62 110 -20 31 2 14 31 45 13 30 27 30 32 20 6 - 50 0 0 31 23 58 7 29 1 63 111 -19 31 2 30 31 45 28 30 27 45 32 20 21 - 49 0 0 31 23 54 7 29 6 63 112 -18 31 2 25 31 45 24 30 27 41 32 20 16 - 48 0 0 31 23 29 7 29 11 64 114 -18 31 2 0 31 44 59 30 27 16 32 19 52 - 47 0 0 31 22 44 7 29 16 65 115 -17 31 1 15 31 44 14 30 26 31 32 19 7 - 46 0 0 31 21 39 7 29 21 66 116 -16 31 0 10 31 43 9 30 25 25 32 18 3 - 45 0 0 31 20 14 7 29 26 66 117 -15 30 58 45 31 41 44 30 23 59 32 16 38 - 44 0 0 31 18 28 7 29 31 67 119 -14 30 56 59 31 39 59 30 22 13 32 14 54 - 43 0 0 31 16 23 7 29 37 68 120 -14 30 54 53 31 37 54 30 20 7 32 12 49 - 42 0 0 31 13 58 7 29 42 69 122 -13 30 52 28 31 35 29 30 17 41 32 10 25 - 41 0 0 31 11 12 7 29 47 70 124 -12 30 49 41 31 32 44 30 14 54 32 7 40 - 40 0 0 31 8 6 7 29 52 70 125 -11 30 46 35 31 29 39 30 11 47 32 4 36 - 39 0 0 31 4 40 7 29 57 71 127 -10 30 43 9 31 26 13 30 8 19 32 1 11 - 38 0 0 31 0 54 7 30 3 72 129 -9 30 39 22 31 22 28 30 4 31 31 57 27 - 37 0 0 30 56 48 7 30 8 72 132 -9 30 35 15 31 18 22 30 0 23 31 53 22 - 36 0 0 30 52 21 7 30 13 73 134 -8 30 30 48 31 13 56 29 55 55 31 48 58 - 35 0 0 30 47 35 7 30 19 74 136 -7 30 26 0 31 9 11 29 51 7 31 44 13 - 34 0 0 30 42 28 7 30 24 74 139 -6 30 20 53 31 4 5 29 45 58 31 39 9 - 33 0 0 30 37 1 7 30 30 75 142 -5 30 15 25 30 58 39 29 40 29 31 33 44 - 32 0 0 30 31 14 7 30 35 76 145 -4 30 9 37 30 52 53 29 34 39 31 27 59 - 31 0 0 30 25 7 7 30 40 76 148 -3 30 3 29 30 46 46 29 28 29 31 21 55 - 30 0 0 30 18 40 7 30 46 77 152 -3 29 57 1 30 40 20 29 22 0 31 15 30 - 29 0 0 30 11 52 7 30 51 77 155 -2 29 50 12 30 33 34 29 15 9 31 8 46 - 28 0 0 30 4 45 7 30 57 78 159 -1 29 43 4 30 26 28 29 7 59 31 1 41 - 27 0 0 29 57 18 7 31 3 78 164 0 29 35 35 30 19 1 29 0 29 30 54 17 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 38385660 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 54 14.2020 DE: +18 32 18.129 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .033 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (205) Martha approx. diameter [km]: 78 approx. diameter ["]: .043 distance from Earth [AU]: 2.52600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 737 number of rejected observations: 78 time covered by the observations: 1907 Nov 07 - 2007 Sep 21 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.012, 93° remarks: * orbital elements for (205) Martha : Mean anomaly = 26.03493880 deg Arg. of pericenter = 172.93553588 deg Long. of node = 211.94586242 deg Inclination = 10.68337849 deg Eccentricity = 0.03405184 Semimajor axis = 2.77658902 AU Perihelion dist = 2.68204107 AU Mag: H = 9.35, G = 0.15 Epoch of elements : MJD 55079.31400000 TDT (2009 Sep 05.314) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 5 205 Martha 7h 31.5m UT 11.8 4 54 14.202 18 32 18.13UCAC2 38385660 0.0 14.5 78 4.4 2.526 2.438 -5.54 -23.8690 18.540 66.80 6.72 7.5256 0.03041 0.18206 9.95945 -1.58959 -0.00555 -0.00064 2000 24.0507962009 827.00000172.935536211.945862 10.6833780.03405184 2.7765890 2.6820411 9.2 5.00.15 RATE 2.1302800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.034 0 1.81 0.035 0 54545.5020090905_385660 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 12:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org