IOTA/IOTA-ES occultation update for (282) Clorinde / UCAC2 24242005 event on 2012 Sep 29, 16:38 UT Visible from SE Asia, India, Arabia, SW Asia Summary ------- On 2012 Sep 29 UT, the 38 km diameter asteroid (282) Clorinde will occult a 11.7 mag star in the constellation Capricornus for observers along a path across SE Asia, India, Arabia, SW Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 15.2 mag (the magnitude of the asteroid) for at most 7.1 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 18 * date and approx. time of event: 2012 Sep 29, 16:25 - 2012 Sep 29, 16:52 UT * geocentric midpoint of event [JD]: 2456200.19340417 * magnitude of target star: 11.7 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 7.1 * Moon: 100 % sunlit, 60° distance * Sun: 115° distance * rough path description: SE Asia, India, Arabia, SW Asia The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 3.70 * 1 sigma uncertainty interval [seconds]: +/- 25.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .110 +/- .107) * 1 sigma uncertainty ellipse (major, minor, PA): ( .110", .107", 90° ) * approx speed of asteroid's shadow [km/s]: 5.3718 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 24242005 by 282 Clorinde on 2012 Sep 29 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 18 0 0 49 22 59 16 25 46 16 149 0 49 3 18 49 42 50 46 42 5 52 14 56 19 0 0 48 45 44 16 25 54 17 150 -1 48 26 5 49 5 32 46 5 5 51 37 20 20 0 0 48 8 10 16 26 2 18 151 -1 47 48 34 48 27 56 45 27 48 50 59 24 21 0 0 47 30 19 16 26 11 19 152 -2 47 10 45 47 50 2 44 50 17 50 21 8 22 0 0 46 52 12 16 26 20 19 153 -3 46 32 41 47 11 53 44 12 31 49 42 34 23 0 0 46 13 52 16 26 30 20 154 -3 45 54 23 46 33 29 43 34 34 49 3 44 24 0 0 45 35 19 16 26 40 21 155 -4 45 15 54 45 54 52 42 56 26 48 24 39 25 0 0 44 56 35 16 26 51 22 156 -5 44 37 14 45 16 5 42 18 9 47 45 22 26 0 0 44 17 43 16 27 2 23 156 -6 43 58 25 44 37 9 41 39 46 47 5 54 27 0 0 43 38 44 16 27 14 24 157 -6 43 19 30 43 58 6 41 1 17 46 26 17 28 0 0 42 59 39 16 27 26 25 158 -7 42 40 30 43 18 58 40 22 44 45 46 34 29 0 0 42 20 32 16 27 39 26 159 -8 42 1 27 42 39 46 39 44 10 45 6 45 30 0 0 41 41 23 16 27 52 27 160 -9 41 22 23 42 0 32 39 5 37 44 26 54 31 0 0 41 2 15 16 28 6 27 161 -10 40 43 19 41 21 20 38 27 5 43 47 2 32 0 0 40 23 10 16 28 20 28 162 -11 40 4 19 40 42 9 37 48 37 43 7 11 33 0 0 39 44 9 16 28 35 29 163 -11 39 25 23 40 3 4 37 10 15 42 27 24 34 0 0 39 5 15 16 28 50 30 164 -12 38 46 34 39 24 4 36 32 0 41 47 42 35 0 0 38 26 29 16 29 6 31 165 -13 38 7 53 38 45 13 35 53 55 41 8 7 36 0 0 37 47 54 16 29 22 32 166 -14 37 29 23 38 6 32 35 16 1 40 28 42 37 0 0 37 9 31 16 29 39 33 167 -15 36 51 5 37 28 3 34 38 21 39 49 28 38 0 0 36 31 22 16 29 56 33 169 -16 36 13 2 36 49 49 34 0 55 39 10 27 39 0 0 35 53 29 16 30 14 34 170 -17 35 35 14 36 11 50 33 23 46 38 31 42 40 0 0 35 15 54 16 30 32 35 171 -18 34 57 45 35 34 9 32 46 56 37 53 15 41 0 0 34 38 38 16 30 51 36 172 -19 34 20 35 34 56 48 32 10 25 37 15 6 42 0 0 34 1 44 16 31 9 36 173 -20 33 43 47 34 19 48 31 34 17 36 37 19 43 0 0 33 25 14 16 31 29 37 174 -21 33 7 22 33 43 11 30 58 32 35 59 55 44 0 0 32 49 8 16 31 48 38 176 -22 32 31 22 33 7 0 30 23 12 35 22 55 45 0 0 32 13 28 16 32 8 38 177 -23 31 55 49 32 31 14 29 48 18 34 46 22 46 0 0 31 38 17 16 32 28 39 178 -24 31 20 43 31 55 57 29 13 53 34 10 17 47 0 0 31 3 35 16 32 49 40 179 -25 30 46 7 31 21 9 28 39 57 33 34 41 48 0 0 30 29 24 16 33 10 40 181 -26 30 12 2 30 46 52 28 6 32 32 59 37 49 0 0 29 55 45 16 33 31 41 182 -27 29 38 29 30 13 8 27 33 40 32 25 6 50 0 0 29 22 41 16 33 52 41 184 -28 29 5 30 29 39 57 27 1 21 31 51 8 51 0 0 28 50 11 16 34 13 42 185 -29 28 33 6 29 7 21 26 29 36 31 17 46 52 0 0 28 18 17 16 34 35 42 186 -30 28 1 18 28 35 22 25 58 28 30 45 1 53 0 0 27 47 1 16 34 57 42 188 -31 27 30 7 28 4 0 25 27 56 30 12 53 54 0 0 27 16 23 16 35 19 43 189 -32 26 59 35 27 33 16 24 58 2 29 41 25 55 0 0 26 46 24 16 35 41 43 191 -33 26 29 42 27 3 12 24 28 47 29 10 36 56 0 0 26 17 6 16 36 3 43 192 -35 26 0 29 26 33 49 24 0 12 28 40 29 57 0 0 25 48 30 16 36 26 44 194 -36 25 31 58 26 5 7 23 32 18 28 11 4 58 0 0 25 20 35 16 36 48 44 195 -37 25 4 9 25 37 7 23 5 5 27 42 22 59 0 0 24 53 23 16 37 11 44 197 -38 24 37 2 25 9 50 22 38 34 27 14 24 60 0 0 24 26 55 16 37 33 44 198 -39 24 10 39 24 43 17 22 12 46 26 47 11 61 0 0 24 1 11 16 37 55 44 200 -40 23 45 0 24 17 28 21 47 42 26 20 42 62 0 0 23 36 13 16 38 18 44 201 -41 23 20 6 23 52 24 21 23 21 25 55 0 63 0 0 23 11 59 16 38 40 44 203 -42 22 55 57 23 28 6 20 59 45 25 30 4 64 0 0 22 48 31 16 39 3 44 204 -43 22 32 34 23 4 34 20 36 54 25 5 55 65 0 0 22 25 50 16 39 25 44 206 -44 22 9 58 22 41 48 20 14 49 24 42 34 66 0 0 22 3 56 16 39 47 44 207 -45 21 48 8 22 19 49 19 53 29 24 20 0 67 0 0 21 42 49 16 40 9 44 209 -46 21 27 5 21 58 38 19 32 56 23 58 15 68 0 0 21 22 29 16 40 31 44 210 -47 21 6 49 21 38 14 19 13 9 23 37 19 69 0 0 21 2 57 16 40 53 43 211 -49 20 47 21 21 18 38 18 54 8 23 17 11 70 0 0 20 44 13 16 41 15 43 213 -50 20 28 41 20 59 50 18 35 55 22 57 53 71 0 0 20 26 17 16 41 36 43 214 -51 20 10 48 20 41 50 18 18 28 22 39 24 72 0 0 20 9 10 16 41 58 43 215 -52 19 53 44 20 24 39 18 1 49 22 21 45 73 0 0 19 52 51 16 42 19 42 217 -53 19 37 29 20 8 17 17 45 57 22 4 55 74 0 0 19 37 20 16 42 40 42 218 -54 19 22 2 19 52 43 17 30 53 21 48 55 75 0 0 19 22 38 16 43 0 41 219 -55 19 7 23 19 37 58 17 16 36 21 33 46 76 0 0 19 8 45 16 43 21 41 220 -56 18 53 33 19 24 2 17 3 7 21 19 26 77 0 0 18 55 41 16 43 41 40 221 -57 18 40 31 19 10 55 16 50 25 21 5 56 78 0 0 18 43 25 16 44 1 40 222 -58 18 28 18 18 58 36 16 38 31 20 53 16 79 0 0 18 31 58 16 44 21 39 224 -59 18 16 54 18 47 6 16 27 24 20 41 26 80 0 0 18 21 20 16 44 40 39 225 -60 18 6 18 18 36 26 16 17 5 20 30 27 81 0 0 18 11 30 16 44 59 38 226 -61 17 56 30 18 26 34 16 7 33 20 20 17 82 0 0 18 2 28 16 45 18 37 227 -62 17 47 31 18 17 30 15 58 49 20 10 56 83 0 0 17 54 15 16 45 36 37 227 -63 17 39 20 18 9 15 15 50 52 20 2 26 84 0 0 17 46 51 16 45 54 36 228 -64 17 31 57 18 1 49 15 43 42 19 54 45 85 0 0 17 40 14 16 46 12 35 229 -65 17 25 22 17 55 10 15 37 19 19 47 53 86 0 0 17 34 26 16 46 30 35 230 -66 17 19 35 17 49 20 15 31 42 19 41 51 87 0 0 17 29 25 16 46 47 34 231 -66 17 14 36 17 44 18 15 26 53 19 36 38 88 0 0 17 25 12 16 47 4 33 232 -67 17 10 24 17 40 4 15 22 50 19 32 13 89 0 0 17 21 46 16 47 20 32 232 -68 17 7 0 17 36 37 15 19 33 19 28 38 90 0 0 17 19 8 16 47 36 32 233 -69 17 4 22 17 33 58 15 17 3 19 25 51 91 0 0 17 17 17 16 47 52 31 234 -70 17 2 32 17 32 6 15 15 18 19 23 52 92 0 0 17 16 13 16 48 7 30 234 -70 17 1 29 17 31 1 15 14 20 19 22 42 93 0 0 17 15 55 16 48 22 29 235 -71 17 1 12 17 30 43 15 14 7 19 22 19 94 0 0 17 16 24 16 48 36 28 236 -72 17 1 41 17 31 12 15 14 39 19 22 44 95 0 0 17 17 40 16 48 50 27 236 -72 17 2 57 17 32 27 15 15 56 19 23 57 96 0 0 17 19 41 16 49 4 27 237 -73 17 4 58 17 34 28 15 17 59 19 25 57 97 0 0 17 22 28 16 49 17 26 238 -73 17 7 45 17 37 15 15 20 46 19 28 44 98 0 0 17 26 0 16 49 30 25 238 -74 17 11 17 17 40 47 15 24 18 19 32 17 99 0 0 17 30 18 16 49 42 24 239 -74 17 15 35 17 45 5 15 28 33 19 36 37 100 0 0 17 35 21 16 49 54 23 239 -74 17 20 37 17 50 9 15 33 33 19 41 44 101 0 0 17 41 9 16 50 5 22 240 -75 17 26 24 17 55 57 15 39 16 19 47 36 102 0 0 17 47 41 16 50 16 21 240 -75 17 32 56 18 2 29 15 45 43 19 54 13 103 0 0 17 54 57 16 50 27 20 241 -75 17 40 11 18 9 46 15 52 53 20 1 36 104 0 0 18 2 57 16 50 37 19 241 -75 17 48 10 18 17 47 16 0 46 20 9 44 105 0 0 18 11 40 16 50 46 18 241 -75 17 56 53 18 26 32 16 9 21 20 18 37 106 0 0 18 21 7 16 50 55 17 242 -74 18 6 18 18 36 0 16 18 39 20 28 14 107 0 0 18 31 17 16 51 4 17 242 -74 18 16 27 18 46 11 16 28 39 20 38 35 108 0 0 18 42 9 16 51 12 16 243 -74 18 27 18 18 57 4 16 39 20 20 49 40 109 0 0 18 53 44 16 51 20 15 243 -73 18 38 51 19 8 40 16 50 42 21 1 28 110 0 0 19 6 0 16 51 27 14 243 -73 18 51 6 19 20 59 17 2 46 21 13 59 111 0 0 19 18 58 16 51 34 13 244 -72 19 4 2 19 33 59 17 15 30 21 27 12 112 0 0 19 32 38 16 51 40 12 244 -72 19 17 40 19 47 40 17 28 55 21 41 8 113 0 0 19 46 58 16 51 46 11 245 -71 19 31 58 20 2 2 17 42 59 21 55 46 114 0 0 20 1 59 16 51 51 10 245 -70 19 46 57 20 17 5 17 57 43 22 11 6 115 0 0 20 17 39 16 51 56 9 245 -70 20 2 35 20 32 48 .. .. .. 22 27 6 116 0 0 20 34 0 16 52 0 8 246 -69 20 18 53 20 49 10 .. .. .. 22 43 47 117 0 0 20 50 59 16 52 4 7 246 -68 20 35 50 21 6 12 .. .. .. 23 1 8 118 0 0 21 8 37 16 52 7 6 247 -67 20 53 26 21 23 53 .. .. .. 23 19 10 119 0 0 21 26 54 16 52 10 5 247 -67 21 11 40 21 42 13 .. .. .. 23 37 50 120 0 0 21 45 49 16 52 12 4 247 -66 21 30 32 22 1 10 .. .. .. 23 57 9 121 0 0 22 5 21 16 52 14 3 248 -65 21 50 1 22 20 45 .. .. .. 24 17 7 122 0 0 22 25 30 16 52 15 2 248 -64 22 10 7 22 40 57 .. .. .. 24 37 43 123 0 0 22 46 15 16 52 15 1 248 -63 22 30 49 23 1 45 .. .. .. 24 58 55 Uncertainty in time = +/- 27 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: UCAC2 24242005 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 17 07.2371 DE: -19 30 54.787 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .109, .106 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (282) Clorinde approx. diameter [km]: 38 approx. diameter ["]: .029 distance from Earth [AU]: 1.80900 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1074 number of rejected observations: 83 time covered by the observations: 1904 May 18 - 2012 Sep 17 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.012, 88° remarks: * orbital elements for (282) Clorinde : Mean anomaly = 250.97124567 deg Arg. of pericenter = 296.54660895 deg Long. of node = 144.99592792 deg Inclination = 9.02947116 deg Eccentricity = 0.08060199 Semimajor axis = 2.33893548 AU Perihelion dist = 2.15041262 AU Mag: H = 10.89, G = 0.15 Epoch of elements : MJD 56199.69300000 TDT (2012 Sep 29.693) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 29 282 Clorinde 16h 38.5m UT 11.7 20 17 7.237-19 30 54.79UCAC2 24242005 0.0 15.2 38 7.1 1.809 0.973 -5.33 45.8109 -19.513 -72.10 -2.76 16.6417 0.26150 0.66532 2.82627 -1.09782 0.00489 0.00111 2000 248.3004862012 920.00000296.546609144.995928 9.0294710.08060199 2.3389355 2.150412610.9 5.00.15 RATE 2.7553490 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.110 0.107 90 4.70 0.107 0 0 1 3 056197.0020120929_242005 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 21:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org