IOTA/IOTA-ES occultation update for (873) Mechthild / HIP 48836 event on 2009 Dec 08, 00:08 UT Visible from Summary ------- On 2009 Dec 08 UT, the 29 km diameter asteroid (873) Mechthild will occult a 9.8 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 6.8 mag to 16.6 mag (the magnitude of the asteroid) for at most 4.1 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: 33 * date and approx. time of event: 2009 Dec 08, 23:57 - 2009 Dec 09, 00:11 UT * magnitude of target star: 9.8 * magnitude drop [mag]: 6.8 * estimated maximum duration [s]: 4.1 * Moon: 62 % sunlit, 4° distance * Sun: 108° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 43 * 1 sigma uncertainty interval [path widths]: +/- 2.01 * 1 sigma uncertainty interval [seconds]: +/- 9.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .034", 99° ) * approx speed of asteroid's shadow [km/s]: 7.0421 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 48836 by 873 Mechthild on 2009 Dec 7 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 - 36 0 0 62 28 58 23 57 45 0 68 -44 62 16 19 62 41 41 .. .. .. 63 33 22 - 35 0 0 62 39 55 23 57 45 1 69 -44 62 27 18 62 52 36 .. .. .. 63 44 9 - 34 0 0 62 50 37 23 57 45 1 70 -44 62 38 2 63 3 17 .. .. .. 63 54 42 - 33 0 0 63 1 5 23 57 46 2 71 -44 62 48 31 63 13 42 .. .. .. 64 4 59 - 32 0 0 63 11 17 23 57 46 2 72 -45 62 58 45 63 23 52 .. .. .. 64 15 2 - 31 0 0 63 21 15 23 57 47 3 73 -45 63 8 44 63 33 48 .. .. .. 64 24 50 - 30 0 0 63 30 57 23 57 47 3 74 -45 63 18 29 63 43 29 .. .. .. 64 34 23 - 29 0 0 63 40 25 23 57 48 4 75 -45 63 27 59 63 52 55 .. .. .. 64 43 42 - 28 0 0 63 49 39 23 57 49 4 76 -45 63 37 14 64 2 7 .. .. .. 64 52 45 - 27 0 0 63 58 38 23 57 49 4 77 -45 63 46 15 64 11 4 .. .. .. 65 1 35 - 26 0 0 64 7 22 23 57 50 5 77 -46 63 55 1 64 19 46 .. .. .. 65 10 10 - 25 0 0 64 15 52 23 57 51 5 78 -46 64 3 33 64 28 14 63 14 30 65 18 31 - 24 0 0 64 24 8 23 57 52 6 79 -46 64 11 50 64 36 28 63 22 54 65 26 37 - 23 0 0 64 32 9 23 57 53 6 80 -46 64 19 53 64 44 28 63 31 4 65 34 30 - 22 0 0 64 39 56 23 57 55 7 81 -46 64 27 42 64 52 13 63 39 0 65 42 8 - 21 0 0 64 47 29 23 57 56 7 82 -46 64 35 17 64 59 45 63 46 41 65 49 33 - 20 0 0 64 54 49 23 57 57 8 83 -46 64 42 38 65 7 2 63 54 8 65 56 43 - 19 0 0 65 1 54 23 57 59 8 84 -46 64 49 45 65 14 6 64 1 22 66 3 40 - 18 0 0 65 8 45 23 58 0 8 85 -46 64 56 38 65 20 56 64 8 21 66 10 23 - 17 0 0 65 15 23 23 58 2 9 86 -46 65 3 17 65 27 32 64 15 6 66 16 53 - 16 0 0 65 21 47 23 58 3 9 87 -46 65 9 43 65 33 55 64 21 38 66 23 9 - 15 0 0 65 27 58 23 58 5 10 87 -46 65 15 55 65 40 4 64 27 56 66 29 12 - 14 0 0 65 33 55 23 58 7 10 88 -46 65 21 53 65 45 59 64 34 0 66 35 1 - 13 0 0 65 39 38 23 58 9 11 89 -46 65 27 38 65 51 42 64 39 51 66 40 38 - 12 0 0 65 45 9 23 58 11 11 90 -46 65 33 10 65 57 10 64 45 28 66 46 1 - 11 0 0 65 50 26 23 58 13 11 91 -46 65 38 28 66 2 26 64 50 51 66 51 11 - 10 0 0 65 55 30 23 58 15 12 92 -46 65 43 34 66 7 29 64 56 2 66 56 8 - 9 0 0 66 0 21 23 58 17 12 93 -46 65 48 26 66 12 18 65 0 59 67 0 53 - 8 0 0 66 4 58 23 58 19 13 94 -46 65 53 5 66 16 55 65 5 42 67 5 24 - 7 0 0 66 9 23 23 58 21 13 95 -46 65 57 31 66 21 19 65 10 13 67 9 43 - 6 0 0 66 13 35 23 58 23 13 96 -46 66 1 44 66 25 29 65 14 31 67 13 49 - 5 0 0 66 17 34 23 58 26 14 97 -46 66 5 44 66 29 28 65 18 35 67 17 43 - 4 0 0 66 21 21 23 58 28 14 98 -46 66 9 31 66 33 13 65 22 26 67 21 24 - 3 0 0 66 24 54 23 58 30 15 99 -46 66 13 6 66 36 46 65 26 5 67 24 52 - 2 0 0 66 28 15 23 58 33 15 100 -46 66 16 28 66 40 6 65 29 31 67 28 8 - 1 0 0 66 31 24 23 58 35 15 101 -46 66 19 37 66 43 13 65 32 43 67 31 12 0 0 0 66 34 20 23 58 38 16 102 -46 66 22 34 66 46 8 65 35 43 67 34 4 1 0 0 66 37 3 23 58 41 16 103 -46 66 25 18 66 48 51 65 38 31 67 36 43 2 0 0 66 39 34 23 58 43 17 104 -46 66 27 50 66 51 21 65 41 5 67 39 10 3 0 0 66 41 53 23 58 46 17 105 -46 66 30 9 66 53 39 65 43 27 67 41 25 4 0 0 66 43 59 23 58 49 17 106 -46 66 32 16 66 55 44 65 45 36 67 43 28 5 0 0 66 45 52 23 58 52 18 106 -46 66 34 10 66 57 37 65 47 33 67 45 19 6 0 0 66 47 34 23 58 55 18 107 -46 66 35 52 66 59 18 65 49 17 67 46 57 7 0 0 66 49 3 23 58 58 18 108 -46 66 37 22 67 0 47 65 50 49 67 48 24 8 0 0 66 50 20 23 59 1 19 109 -45 66 38 39 67 2 3 65 52 8 67 49 38 9 0 0 66 51 24 23 59 4 19 110 -45 66 39 44 67 3 7 65 53 14 67 50 41 10 0 0 66 52 16 23 59 7 20 111 -45 66 40 36 67 3 59 65 54 8 67 51 32 11 0 0 66 52 57 23 59 10 20 112 -45 66 41 17 67 4 39 65 54 49 67 52 10 12 0 0 66 53 24 23 59 13 20 113 -45 66 41 45 67 5 7 65 55 18 67 52 37 13 0 0 66 53 40 23 59 17 21 114 -45 66 42 0 67 5 22 65 55 35 67 52 52 14 0 0 66 53 43 23 59 20 21 115 -45 66 42 4 67 5 25 65 55 38 67 52 54 15 0 0 66 53 34 23 59 23 21 116 -45 66 41 55 67 5 16 65 55 30 67 52 45 16 0 0 66 53 13 23 59 27 22 117 -44 66 41 34 67 4 55 65 55 9 67 52 24 17 0 0 66 52 39 23 59 30 22 118 -44 66 41 0 67 4 21 65 54 35 67 51 51 18 0 0 66 51 54 23 59 34 22 119 -44 66 40 14 67 3 36 65 53 49 67 51 5 19 0 0 66 50 56 23 59 38 23 120 -44 66 39 16 67 2 38 65 52 50 67 50 8 20 0 0 66 49 45 23 59 41 23 121 -44 66 38 5 67 1 27 65 51 38 67 48 59 21 0 0 66 48 22 23 59 45 24 122 -44 66 36 42 67 0 5 65 50 14 67 47 37 22 0 0 66 46 47 23 59 49 24 123 -43 66 35 7 66 58 30 65 48 37 67 46 4 23 0 0 66 44 59 23 59 53 24 124 -43 66 33 18 66 56 43 65 46 48 67 44 18 24 0 0 66 42 59 23 59 57 25 125 -43 66 31 18 66 54 43 65 44 45 67 42 20 25 0 0 66 40 46 24 0 1 25 126 -43 66 29 5 66 52 30 65 42 30 67 40 9 26 0 0 66 38 21 24 0 5 25 127 -43 66 26 39 66 50 6 65 40 2 67 37 47 27 0 0 66 35 43 24 0 9 26 129 -42 66 24 0 66 47 28 65 37 21 67 35 12 28 0 0 66 32 52 24 0 13 26 130 -42 66 21 8 66 44 38 65 34 27 67 32 24 29 0 0 66 29 48 24 0 17 26 131 -42 66 18 4 66 41 35 65 31 20 67 29 24 30 0 0 66 26 32 24 0 22 27 132 -42 66 14 47 66 38 19 65 28 0 67 26 12 31 0 0 66 23 2 24 0 26 27 133 -41 66 11 17 66 34 51 65 24 27 67 22 47 32 0 0 66 19 20 24 0 31 27 134 -41 66 7 34 66 31 9 65 20 41 67 19 9 33 0 0 66 15 25 24 0 35 28 135 -41 66 3 37 66 27 15 65 16 41 67 15 18 34 0 0 66 11 16 24 0 40 28 136 -41 65 59 28 66 23 7 65 12 27 67 11 14 35 0 0 66 6 54 24 0 44 28 137 -41 65 55 5 66 18 46 65 8 1 67 6 57 36 0 0 66 2 19 24 0 49 29 138 -40 65 50 29 66 14 12 65 3 20 67 2 28 37 0 0 65 57 30 24 0 54 29 139 -40 65 45 39 66 9 25 64 58 26 66 57 45 38 0 0 65 52 28 24 0 59 29 140 -40 65 40 36 66 4 24 64 53 19 66 52 48 39 0 0 65 47 12 24 1 4 30 141 -39 65 35 19 65 59 9 64 47 57 66 47 39 40 0 0 65 41 43 24 1 9 30 142 -39 65 29 48 65 53 41 64 42 21 66 42 16 41 0 0 65 35 59 24 1 14 30 143 -39 65 24 3 65 47 58 64 36 32 66 36 39 42 0 0 65 30 2 24 1 19 31 145 -39 65 18 4 65 42 2 64 30 28 66 30 48 43 0 0 65 23 51 24 1 25 31 146 -38 65 11 52 65 35 52 64 24 10 66 24 44 44 0 0 65 17 25 24 1 30 31 147 -38 65 5 25 65 29 28 64 17 37 66 18 26 45 0 0 65 10 45 24 1 35 32 148 -38 64 58 43 65 22 50 64 10 50 66 11 54 46 0 0 65 3 51 24 1 41 32 149 -37 64 51 47 65 15 57 64 3 48 66 5 7 47 0 0 64 56 42 24 1 47 32 150 -37 64 44 37 65 8 50 63 56 32 65 58 6 48 0 0 64 49 18 24 1 52 33 151 -37 64 37 12 65 1 28 63 49 1 65 50 51 49 0 0 64 41 40 24 1 58 33 152 -36 64 29 32 64 53 51 63 41 14 65 43 21 50 0 0 64 33 47 24 2 4 33 154 -36 64 21 37 64 45 59 63 33 13 65 35 36 51 0 0 64 25 38 24 2 10 34 155 -36 64 13 27 64 37 53 63 24 56 65 27 37 52 0 0 64 17 15 24 2 16 34 156 -35 64 5 2 64 29 31 63 16 25 65 19 22 53 0 0 64 8 36 24 2 23 34 157 -35 63 56 21 64 20 54 63 7 37 65 10 52 54 0 0 63 59 42 24 2 29 34 158 -35 63 47 25 64 12 2 62 58 34 65 2 8 55 0 0 63 50 32 24 2 35 35 159 -34 63 38 14 64 2 54 62 49 16 64 53 7 56 0 0 63 41 7 24 2 42 35 161 -34 63 28 47 63 53 30 62 39 41 64 43 51 57 0 0 63 31 26 24 2 48 35 162 -33 63 19 4 63 43 51 62 29 51 64 34 20 58 0 0 63 21 29 24 2 55 36 163 -33 63 9 5 63 33 56 62 19 45 64 24 32 59 0 0 63 11 15 24 3 2 36 164 -33 62 58 50 63 23 45 62 9 22 64 14 29 60 0 0 63 0 46 24 3 9 36 165 -32 62 48 18 63 13 17 61 58 43 64 4 10 61 0 0 62 50 0 24 3 16 37 167 -32 62 37 31 63 2 33 61 47 48 63 53 34 62 0 0 62 38 58 24 3 23 37 168 -31 62 26 27 62 51 33 61 36 36 63 42 42 63 0 0 62 27 40 24 3 30 37 169 -31 62 15 6 62 40 17 61 25 8 63 31 34 64 0 0 62 16 5 24 3 38 37 170 -31 62 3 29 62 28 44 61 13 23 63 20 9 65 0 0 62 4 13 24 3 45 38 172 -30 61 51 35 62 16 54 61 1 22 63 8 28 66 0 0 61 52 4 24 3 53 38 173 -30 61 39 24 62 4 47 60 49 3 62 56 29 67 0 0 61 39 38 24 4 1 38 174 -29 61 26 57 61 52 23 60 36 28 62 44 14 68 0 0 61 26 56 24 4 9 38 175 -29 61 14 12 61 39 43 60 23 35 62 31 42 69 0 0 61 13 56 24 4 17 39 177 -28 61 1 10 61 26 45 60 10 26 62 18 52 70 0 0 61 0 39 24 4 25 39 178 -28 60 47 52 61 13 30 59 56 59 62 5 46 71 0 0 60 47 5 24 4 33 39 179 -27 60 34 16 60 59 58 59 43 16 61 52 22 72 0 0 60 33 14 24 4 41 39 181 -27 60 20 22 60 46 9 59 29 15 61 38 41 73 0 0 60 19 6 24 4 50 40 182 -26 60 6 12 60 32 3 59 14 57 61 24 43 74 0 0 60 4 40 24 4 58 40 183 -26 59 51 44 60 17 39 59 0 21 61 10 27 75 0 0 59 49 57 24 5 7 40 185 -25 59 36 59 60 2 58 58 45 29 60 55 54 76 0 0 59 34 56 24 5 16 40 186 -25 59 21 57 59 47 59 58 30 19 60 41 4 77 0 0 59 19 39 24 5 25 40 187 -24 59 6 37 59 32 43 58 14 52 60 25 56 78 0 0 59 4 4 24 5 34 41 189 -24 58 51 1 59 17 10 57 59 8 60 10 31 79 0 0 58 48 11 24 5 43 41 190 -23 58 35 7 59 1 20 57 43 7 59 54 48 80 0 0 58 32 2 24 5 53 41 192 -22 58 18 56 58 45 12 57 26 49 59 38 48 81 0 0 58 15 36 24 6 2 41 193 -22 58 2 27 58 28 48 57 10 14 59 22 30 82 0 0 57 58 52 24 6 12 41 194 -21 57 45 42 58 12 6 56 53 23 59 5 56 83 0 0 57 41 52 24 6 21 41 196 -21 57 28 40 57 55 7 56 36 14 58 49 4 84 0 0 57 24 35 24 6 31 42 197 -20 57 11 21 57 37 52 56 18 49 58 31 55 85 0 0 57 7 1 24 6 41 42 199 -20 56 53 46 57 20 20 56 1 8 58 14 30 86 0 0 56 49 11 24 6 51 42 200 -19 56 35 55 57 2 31 55 43 10 57 56 47 87 0 0 56 31 4 24 7 2 42 202 -18 56 17 47 56 44 26 55 24 57 57 38 48 88 0 0 56 12 42 24 7 12 42 203 -18 55 59 23 56 26 5 55 6 28 57 20 33 89 0 0 55 54 4 24 7 22 42 204 -17 55 40 43 56 7 28 54 47 43 57 2 2 90 0 0 55 35 10 24 7 33 42 206 -16 55 21 48 55 48 35 54 28 43 56 43 14 91 0 0 55 16 1 24 7 44 42 207 -16 55 2 38 55 29 27 54 9 28 56 24 12 92 0 0 54 56 37 24 7 54 42 209 -15 54 43 12 55 10 4 53 49 58 56 4 53 93 0 0 54 36 58 24 8 5 42 210 -14 54 23 33 54 50 27 53 30 14 55 45 20 94 0 0 54 17 5 24 8 16 42 212 -14 54 3 39 54 30 35 53 10 17 55 25 32 95 0 0 53 56 58 24 8 27 42 213 -13 53 43 31 54 10 29 52 50 5 55 5 30 96 0 0 53 36 37 24 8 38 42 215 -12 53 23 9 53 50 9 52 29 41 54 45 13 97 0 0 53 16 3 24 8 50 42 216 -12 53 2 35 53 29 36 52 9 3 54 24 43 98 0 0 52 55 17 24 9 1 42 218 -11 52 41 48 53 8 50 51 48 14 54 4 0 99 0 0 52 34 19 24 9 12 42 219 -10 52 20 49 52 47 52 51 27 13 53 43 5 100 0 0 52 13 8 24 9 24 41 221 -9 51 59 38 52 26 43 51 6 0 53 21 57 101 0 0 51 51 47 24 9 35 41 222 -9 51 38 16 52 5 22 50 44 37 53 0 38 102 0 0 51 30 15 24 9 47 41 224 -8 51 16 44 51 43 50 50 23 3 52 39 7 103 0 0 51 8 33 24 9 58 41 225 -7 50 55 2 51 22 8 50 1 20 52 17 26 104 0 0 50 46 41 24 10 10 41 226 -6 50 33 10 51 0 17 49 39 28 51 55 35 105 0 0 50 24 41 24 10 22 40 228 -6 50 11 10 50 38 16 49 17 27 51 33 35 106 0 0 50 2 32 24 10 33 40 229 -5 49 49 1 50 16 7 48 55 19 51 11 26 107 0 0 49 40 16 24 10 45 40 231 -4 49 26 45 49 53 51 48 33 3 50 49 9 108 0 0 49 17 53 24 10 57 40 232 -3 49 4 22 49 31 27 48 10 41 50 26 44 109 0 0 48 55 23 24 11 9 39 233 -3 48 41 53 49 8 57 47 48 13 50 4 13 110 0 0 48 32 48 24 11 20 39 235 -2 48 19 18 48 46 22 47 25 40 49 41 36 111 0 0 48 10 8 24 11 32 39 236 -1 47 56 39 48 23 42 47 3 3 49 18 53 112 0 0 47 47 24 24 11 44 38 238 0 47 33 55 48 0 57 46 40 22 48 56 6 Uncertainty in time = +/- 9 secs [Prediction of 2008 Nov 16.0] Data for the target star ------------------------ * name: HIP 48836 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 57 42.7251 DE: +09 58 42.062 * position source: mpos:UCAC2 pm:UCAC2 plx:HIP2 * standard error: RA,DE ["]: ( .021, .024 ) * V mag [mag]: 9.8 * B mag [mag]: 10.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (873) Mechthild approx. diameter [km]: 29 approx. diameter ["]: .017 distance from Earth [AU]: 2.38200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 938 number of rejected observations: 57 time covered by the observations: 1917 May 21 - 2008 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.024, 103° remarks: * orbital elements for (873) Mechthild : Mean anomaly = 244.06162794 deg Arg. of pericenter = 108.50045345 deg Long. of node = 150.28836897 deg Inclination = 5.26429206 deg Eccentricity = 0.15003380 Semimajor axis = 2.62678464 AU Perihelion dist = 2.23267817 AU Mag: H = 11.35, G = 0.15 Epoch of elements : MJD 55173.00600000 TDT (2009 Dec 08.006) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 8 873 Mechthild 0h 7.9m UT 9.8 9 57 42.725 9 58 42.06HIP 48836 10.4 16.6 29 4.1 2.382 0.954 -4.05 70.5740 9.980 175.98 -22.71 0.1308 0.20544 0.71131 3.81965 -1.09952 -0.00530 0.00201 2000 243.365713200912 5.00000108.500453150.288369 5.2642920.15003380 2.6267846 2.232678211.5 5.00.15 RATE 2.3150870 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.034 99 3.01 0.034 0 54786.5020091208__48836 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 16, 18:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org