IOTA/IOTA-ES occultation update for (141) Lumen / TYC 5220-00923-1 event on 2012 Nov 06, 21:00 UT Visible from Africa Summary ------- On 2012 Nov 06 UT, the 145 km diameter asteroid (141) Lumen will occult a 10.7 mag star in the constellation Aquarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.8 mag to 12.3 mag (the magnitude of the asteroid) for at most 10.1 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: 99 * date and approx. time of event: 2012 Nov 06, 21:00 - 2012 Nov 06, 21:08 UT * geocentric midpoint of event [JD]: 2456238.3758375 * magnitude of target star: 10.7 * magnitude drop [mag]: 1.8 * estimated maximum duration [s]: 10.1 * Moon: 51 % sunlit, 170° distance * Sun: 99° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 150 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .026", 74° ) * approx speed of asteroid's shadow [km/s]: 14.3178 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5220-00923-1 by 141 Lumen on 2012 Nov 6 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 - 50 0 0 4 31 33 21 0 21 74 132 0 3 47 25 5 15 51 3 27 10 5 36 16 - 49 0 0 4 57 29 21 0 30 75 136 -2 4 13 17 5 41 51 3 53 0 6 2 18 - 48 0 0 5 23 39 21 0 39 75 140 -3 4 39 23 6 8 5 4 19 4 6 28 34 - 47 0 0 5 50 3 21 0 47 75 144 -4 5 5 43 6 34 33 4 45 23 6 55 4 - 46 0 0 6 16 40 21 0 56 75 148 -5 5 32 17 7 1 13 5 11 55 7 21 47 - 45 0 0 6 43 30 21 1 5 76 153 -6 5 59 3 7 28 6 5 38 39 7 48 41 - 44 0 0 7 10 31 21 1 14 76 157 -7 6 26 0 7 55 11 6 5 35 8 15 47 - 43 0 0 7 37 42 21 1 22 76 162 -8 6 53 9 8 22 25 6 32 42 8 43 3 - 42 0 0 8 5 4 21 1 31 75 166 -9 7 20 27 8 49 50 6 59 59 9 10 29 - 41 0 0 8 32 35 21 1 40 75 170 -10 7 47 56 9 17 24 7 27 26 9 38 4 - 40 0 0 9 0 14 21 1 48 75 174 -12 8 15 32 9 45 6 7 55 2 10 5 48 - 39 0 0 9 28 1 21 1 57 74 178 -13 8 43 17 10 12 56 8 22 45 10 33 39 - 38 0 0 9 55 55 21 2 6 74 182 -14 9 11 8 10 40 52 8 50 36 11 1 36 - 37 0 0 10 23 55 21 2 14 73 186 -15 9 39 6 11 8 54 9 18 33 11 29 39 - 36 0 0 10 52 1 21 2 23 73 189 -16 10 7 10 11 37 1 9 46 35 11 57 47 - 35 0 0 11 20 10 21 2 32 72 192 -17 10 35 17 12 5 13 10 14 42 12 25 59 - 34 0 0 11 48 23 21 2 40 71 195 -18 11 3 29 12 33 27 10 42 53 12 54 15 - 33 0 0 12 16 39 21 2 49 71 198 -19 11 31 44 13 1 45 11 11 7 13 22 32 - 32 0 0 12 44 57 21 2 57 70 200 -20 12 0 0 13 30 3 11 39 23 13 50 52 - 31 0 0 13 13 16 21 3 5 69 202 -21 12 28 18 13 58 23 12 7 40 14 19 12 - 30 0 0 13 41 35 21 3 14 68 205 -23 12 56 36 14 26 43 12 35 58 14 47 32 - 29 0 0 14 9 53 21 3 22 67 207 -24 13 24 54 14 55 2 13 4 16 15 15 51 - 28 0 0 14 38 10 21 3 30 67 208 -25 13 53 11 15 23 19 13 32 33 15 44 9 - 27 0 0 15 6 25 21 3 38 66 210 -26 14 21 26 15 51 34 14 0 47 16 12 24 - 26 0 0 15 34 37 21 3 46 65 212 -27 14 49 38 16 19 46 14 28 59 16 40 35 - 25 0 0 16 2 44 21 3 54 64 213 -28 15 17 46 16 47 53 14 57 7 17 8 42 - 24 0 0 16 30 48 21 4 2 63 215 -29 15 45 49 17 15 55 15 25 11 17 36 45 - 23 0 0 16 58 45 21 4 10 62 216 -30 16 13 48 17 43 52 15 53 10 18 4 41 - 22 0 0 17 26 37 21 4 17 61 217 -31 16 41 40 18 11 43 16 21 3 18 32 31 - 21 0 0 17 54 21 21 4 25 60 218 -32 17 9 26 18 39 26 16 48 49 19 0 14 - 20 0 0 18 21 58 21 4 32 59 220 -33 17 37 4 19 7 1 17 16 27 19 27 48 - 19 0 0 18 49 26 21 4 40 58 221 -34 18 4 33 19 34 28 17 43 58 19 55 14 - 18 0 0 19 16 45 21 4 47 57 222 -35 18 31 54 20 1 45 18 11 19 20 22 30 - 17 0 0 19 43 54 21 4 54 56 223 -36 18 59 5 20 28 52 18 38 31 20 49 36 - 16 0 0 20 10 52 21 5 1 55 224 -37 19 26 5 20 55 48 19 5 33 21 16 32 - 15 0 0 20 37 39 21 5 8 54 224 -38 19 52 55 21 22 33 19 32 23 21 43 15 - 14 0 0 21 4 14 21 5 15 53 225 -39 20 19 33 21 49 6 19 59 2 22 9 47 - 13 0 0 21 30 37 21 5 22 52 226 -40 20 45 58 22 15 26 20 25 29 22 36 6 - 12 0 0 21 56 47 21 5 28 51 227 -41 21 12 10 22 41 32 20 51 42 23 2 11 - 11 0 0 22 22 43 21 5 35 50 228 -42 21 38 9 23 7 25 21 17 42 23 28 3 - 10 0 0 22 48 24 21 5 41 49 229 -43 22 3 54 23 33 4 21 43 29 23 53 39 - 9 0 0 23 13 51 21 5 48 48 229 -44 22 29 24 23 58 27 22 9 0 24 19 1 - 8 0 0 23 39 2 21 5 54 47 230 -45 22 54 39 24 23 35 22 34 16 24 44 8 - 7 0 0 24 3 58 21 6 0 46 231 -46 23 19 38 24 48 27 22 59 17 25 8 58 - 6 0 0 24 28 37 21 6 6 45 231 -47 23 44 21 25 13 2 23 24 2 25 33 32 - 5 0 0 24 52 59 21 6 11 44 232 -48 24 8 47 25 37 21 23 48 30 25 57 48 - 4 0 0 25 17 4 21 6 17 43 233 -49 24 32 56 26 1 22 24 12 40 26 21 48 - 3 0 0 25 40 52 21 6 22 42 233 -50 24 56 47 26 25 5 24 36 34 26 45 29 - 2 0 0 26 4 21 21 6 28 41 234 -50 25 20 21 26 48 31 25 0 9 27 8 53 - 1 0 0 26 27 32 21 6 33 40 235 -51 25 43 36 27 11 37 25 23 26 27 31 57 0 0 0 26 50 25 21 6 38 39 235 -52 26 6 33 27 34 25 25 46 25 27 54 43 1 0 0 27 12 58 21 6 43 38 236 -53 26 29 10 27 56 54 26 9 5 28 17 10 2 0 0 27 35 12 21 6 48 37 237 -54 26 51 29 28 19 3 26 31 25 28 39 17 3 0 0 27 57 6 21 6 52 36 237 -55 27 13 27 28 40 53 26 53 25 29 1 4 4 0 0 28 18 40 21 6 57 36 238 -55 27 35 6 29 2 22 27 15 6 29 22 32 5 0 0 28 39 54 21 7 1 35 238 -56 27 56 24 29 23 31 27 36 27 29 43 39 6 0 0 29 0 47 21 7 6 34 239 -57 28 17 22 29 44 20 27 57 27 30 4 25 7 0 0 29 21 20 21 7 10 33 240 -58 28 38 0 30 4 48 28 18 7 30 24 51 8 0 0 29 41 31 21 7 14 32 240 -58 28 58 16 30 24 55 28 38 25 30 44 56 9 0 0 30 1 22 21 7 18 31 241 -59 29 18 12 30 44 41 28 58 23 31 4 39 10 0 0 30 20 52 21 7 22 30 241 -60 29 37 46 31 4 6 29 18 0 31 24 2 11 0 0 30 40 0 21 7 25 29 242 -61 29 56 59 31 23 9 29 37 15 31 43 3 12 0 0 30 58 46 21 7 29 28 243 -61 30 15 51 31 41 51 29 56 8 32 1 42 13 0 0 31 17 11 21 7 32 27 243 -62 30 34 20 32 0 11 30 14 40 32 20 0 14 0 0 31 35 15 21 7 36 26 244 -63 30 52 28 32 18 9 30 32 50 32 37 56 15 0 0 31 52 56 21 7 39 25 244 -63 31 10 14 32 35 46 30 50 39 32 55 31 16 0 0 32 10 15 21 7 42 24 245 -64 31 27 39 32 53 0 31 8 5 33 12 43 17 0 0 32 27 13 21 7 45 24 246 -64 31 44 41 33 9 53 31 25 9 33 29 33 18 0 0 32 43 48 21 7 48 23 246 -65 32 1 21 33 26 24 31 41 52 33 46 2 19 0 0 33 0 1 21 7 50 22 247 -65 32 17 39 33 42 32 31 58 12 34 2 8 20 0 0 33 15 52 21 7 53 21 247 -66 32 33 34 33 58 18 32 14 10 34 17 52 21 0 0 33 31 21 21 7 55 20 248 -66 32 49 8 34 13 43 32 29 45 34 33 15 22 0 0 33 46 28 21 7 58 19 248 -67 33 4 19 34 28 45 32 44 58 34 48 15 23 0 0 34 1 12 21 8 0 18 249 -67 33 19 8 34 43 25 32 59 49 35 2 52 24 0 0 34 15 35 21 8 2 17 250 -68 33 33 35 34 57 42 33 14 18 35 17 8 25 0 0 34 29 35 21 8 4 17 250 -68 33 47 39 35 11 38 33 28 24 35 31 2 26 0 0 34 43 12 21 8 6 16 251 -68 34 1 21 35 25 11 33 42 8 35 44 33 27 0 0 34 56 28 21 8 8 15 251 -69 34 14 41 35 38 23 33 55 30 35 57 42 28 0 0 35 9 21 21 8 10 14 252 -69 34 27 38 35 51 12 34 8 30 36 10 30 29 0 0 35 21 53 21 8 11 13 253 -69 34 40 14 36 3 39 34 21 7 36 22 55 30 0 0 35 34 2 21 8 13 12 253 -69 34 52 27 36 15 44 34 33 22 36 34 58 31 0 0 35 45 49 21 8 14 11 254 -69 35 4 18 36 27 27 34 45 14 36 46 39 32 0 0 35 57 14 21 8 15 11 254 -69 35 15 46 36 38 48 34 56 45 36 57 59 33 0 0 36 8 16 21 8 17 10 255 -69 35 26 53 36 49 48 35 7 53 37 8 56 34 0 0 36 18 57 21 8 18 9 256 -70 35 37 38 37 0 25 35 18 39 37 19 32 35 0 0 36 29 16 21 8 19 8 256 -70 35 48 0 37 10 40 35 29 3 37 29 46 36 0 0 36 39 14 21 8 19 7 257 -69 35 58 1 37 20 34 35 39 5 37 39 38 37 0 0 36 48 49 21 8 20 6 257 -69 36 7 39 37 30 6 35 48 46 37 49 8 38 0 0 36 58 2 21 8 21 6 258 -69 36 16 56 37 39 16 35 58 4 37 58 17 39 0 0 37 6 54 21 8 22 5 259 -69 36 25 51 37 48 5 36 7 0 38 7 4 40 0 0 37 15 24 21 8 22 4 259 -69 36 34 24 37 56 32 36 15 34 38 15 30 41 0 0 37 23 33 21 8 22 3 260 -69 36 42 35 38 4 38 36 23 47 38 23 34 42 0 0 37 31 20 21 8 23 2 260 -69 36 50 25 38 12 22 36 31 38 38 31 17 43 0 0 37 38 45 21 8 23 2 261 -68 36 57 53 38 19 45 36 39 7 38 38 39 44 0 0 37 45 49 21 8 23 1 262 -68 37 5 0 38 26 46 36 46 15 38 45 39 45 0 0 37 52 32 21 8 23 0 262 -68 37 11 45 .. .. .. 36 53 1 .. .. .. Uncertainty in time = +/- 3 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 5220-00923-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 32 51.7362 DE: -06 13 53.859 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .024 ) * V mag [mag]: 10.7 * B mag [mag]: 11.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (141) Lumen approx. diameter [km]: 145 approx. diameter ["]: .115 distance from Earth [AU]: 1.74500 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 801 number of rejected observations: 85 time covered by the observations: 1918 Jan 15 - 2012 Oct 01 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.010, 54° remarks: * orbital elements for (141) Lumen : Mean anomaly = 343.74701409 deg Arg. of pericenter = 58.36087845 deg Long. of node = 318.54321624 deg Inclination = 11.88628826 deg Eccentricity = 0.21294279 Semimajor axis = 2.66587272 AU Perihelion dist = 2.09819434 AU Mag: H = 8.35, G = 0.15 Epoch of elements : MJD 56237.87600000 TDT (2012 Nov 06.876) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 6 141 Lumen 21h 1.2m UT 10.7 21 32 51.736- 6 13 53.86TYC 5220-00923-1 11.1 12.3 145 10.1 1.745 2.504 16.24 -38.5629 -6.236 -139.38 -16.29 21.0201 -0.09935 0.22845 7.41073 3.22324 0.00520 0.00164 2000 341.96360620121030.00000 58.360878318.543216 11.8862880.21294279 2.6658727 2.0981943 8.2 5.00.15 RATE 2.2643570 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.026 74 1.23 0.026 0 0 2 1 056208.0020121106_0923-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 20:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org