IOTA/IOTA-ES occultation update for (209) Dido / TYC 6343-00075-1 event on 2012 Nov 05, 16:09 UT Visible from India, Africa Summary ------- On 2012 Nov 05 UT, the 179 km diameter asteroid (209) Dido will occult a 11.0 mag star in the constellation Capricornus for observers along a path across India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 14.0 mag (the magnitude of the asteroid) for at most 9.0 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: 97 * date and approx. time of event: 2012 Nov 05, 16:09 - 2012 Nov 05, 16:14 UT * geocentric midpoint of event [JD]: 2456237.17290417 * magnitude of target star: 11.0 * magnitude drop [mag]: 3.1 * estimated maximum duration [s]: 9.0 * Moon: 63 % sunlit, 166° distance * Sun: 85° distance * rough path description: India, Africa The occultation path -------------------- * approximate projected width [km]: 183 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .030", 88° ) * approx speed of asteroid's shadow [km/s]: 19.8339 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6343-00075-1 by 209 Dido on 2012 Nov 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 26 0 0 - 7 16 32 16 9 42 75 186 0 - 8 12 31 - 6 20 18 - 8 56 2 - 5 36 17 27 0 0 - 6 44 59 16 9 49 74 189 -2 - 7 41 10 - 5 48 34 - 8 24 51 - 5 4 23 28 0 0 - 6 12 53 16 9 55 74 192 -3 - 7 9 17 - 5 16 16 - 7 53 6 - 4 31 56 29 0 0 - 5 40 15 16 10 2 73 195 -4 - 6 36 50 - 4 43 26 - 7 20 49 - 3 58 56 30 0 0 - 5 7 6 16 10 8 72 197 -5 - 6 3 52 - 4 10 4 - 6 48 0 - 3 25 25 31 0 0 - 4 33 24 16 10 14 71 200 -6 - 5 30 23 - 3 36 12 - 6 14 40 - 2 51 23 32 0 0 - 3 59 13 16 10 21 70 202 -7 - 4 56 23 - 3 1 49 - 5 40 48 - 2 16 51 33 0 0 - 3 24 32 16 10 27 69 204 -8 - 4 21 53 - 2 26 56 - 5 6 27 - 1 41 49 34 0 0 - 2 49 22 16 10 33 69 206 -10 - 3 46 54 - 1 51 34 - 4 31 37 - 1 6 19 35 0 0 - 2 13 43 16 10 40 68 207 -11 - 3 11 27 - 1 15 45 - 3 56 18 - 0 30 21 36 0 0 - 1 37 38 16 10 46 67 209 -12 - 2 35 32 - 0 39 29 - 3 20 32 0 6 4 37 0 0 - 1 1 6 16 10 52 66 210 -13 - 1 59 11 - 0 2 47 - 2 44 19 0 42 54 38 0 0 - 0 24 10 16 10 58 64 211 -14 - 1 22 24 0 34 20 - 2 7 41 1 20 10 39 0 0 0 13 11 16 11 5 63 212 -15 - 0 45 14 1 11 51 - 1 30 37 1 57 49 40 0 0 0 50 55 16 11 11 62 213 -16 - 0 7 39 1 49 45 - 0 53 11 2 35 50 41 0 0 1 29 1 16 11 17 61 214 -18 0 30 17 2 28 1 - 0 15 21 3 14 13 42 0 0 2 7 28 16 11 23 60 215 -19 1 8 35 3 6 36 0 22 49 3 52 56 43 0 0 2 46 14 16 11 29 59 216 -20 1 47 12 3 45 31 1 1 20 4 31 58 44 0 0 3 25 18 16 11 35 58 217 -21 2 26 9 4 24 44 1 40 10 5 11 17 45 0 0 4 4 40 16 11 41 57 217 -22 3 5 22 5 4 14 2 19 17 5 50 53 46 0 0 4 44 17 16 11 46 56 218 -23 3 44 51 5 43 58 2 58 41 6 30 43 47 0 0 5 24 8 16 11 52 54 219 -25 4 24 36 6 23 56 3 38 20 7 10 47 48 0 0 6 4 12 16 11 58 53 219 -26 5 4 33 7 4 7 4 18 12 7 51 3 49 0 0 6 44 27 16 12 3 52 220 -27 5 44 42 7 44 29 4 58 16 8 31 30 50 0 0 7 24 53 16 12 9 51 220 -28 6 25 2 8 24 59 5 38 31 9 12 5 51 0 0 8 5 26 16 12 14 50 221 -29 7 5 30 9 5 38 6 18 56 9 52 48 52 0 0 8 46 7 16 12 20 49 222 -30 7 46 6 9 46 24 6 59 28 10 33 37 53 0 0 9 26 53 16 12 25 47 222 -31 8 26 48 10 27 14 7 40 7 11 14 30 54 0 0 10 7 43 16 12 30 46 223 -33 9 7 34 11 8 7 8 20 50 11 55 26 55 0 0 10 48 35 16 12 35 45 223 -34 9 48 23 11 49 2 9 1 37 12 36 24 56 0 0 11 29 28 16 12 40 44 223 -35 10 29 14 12 29 58 9 42 26 13 17 22 57 0 0 12 10 20 16 12 44 43 224 -36 11 10 4 13 10 52 10 23 14 13 58 17 58 0 0 12 51 10 16 12 49 42 224 -37 11 50 53 13 51 43 11 4 2 14 39 10 59 0 0 13 31 56 16 12 54 40 225 -38 12 31 38 14 32 30 11 44 46 15 19 58 60 0 0 14 12 37 16 12 58 39 225 -39 13 12 19 15 13 12 12 25 27 16 0 39 61 0 0 14 53 11 16 13 2 38 226 -40 13 52 53 15 53 46 13 6 1 16 41 13 62 0 0 15 33 37 16 13 6 37 226 -41 14 33 20 16 34 11 13 46 29 17 21 37 63 0 0 16 13 53 16 13 10 36 226 -42 15 13 37 17 14 25 14 26 47 18 1 51 64 0 0 16 53 58 16 13 14 34 227 -43 15 53 44 17 54 29 15 6 56 18 41 52 65 0 0 17 33 51 16 13 18 33 227 -45 16 33 39 18 34 19 15 46 52 19 21 40 66 0 0 18 13 30 16 13 22 32 228 -46 17 13 21 19 13 54 16 26 36 20 1 14 67 0 0 18 52 53 16 13 25 31 228 -47 17 52 48 19 53 15 17 6 6 20 40 31 68 0 0 19 32 0 16 13 29 30 229 -48 18 31 59 20 32 18 17 45 20 21 19 31 69 0 0 20 10 50 16 13 32 29 229 -48 19 10 53 21 11 3 18 24 18 21 58 13 70 0 0 20 49 21 16 13 35 28 229 -49 19 49 29 21 49 29 19 2 58 22 36 34 71 0 0 21 27 32 16 13 38 26 230 -50 20 27 45 22 27 34 19 41 18 23 14 35 72 0 0 22 5 21 16 13 41 25 230 -51 21 5 41 23 5 18 20 19 18 23 52 14 73 0 0 22 42 49 16 13 43 24 231 -52 21 43 15 23 42 39 20 56 57 24 29 31 74 0 0 23 19 54 16 13 46 23 231 -53 22 20 26 24 19 37 21 34 14 25 6 23 75 0 0 23 56 35 16 13 48 22 232 -54 22 57 14 24 56 10 22 11 7 25 42 51 76 0 0 24 32 50 16 13 51 21 232 -55 23 33 38 25 32 18 22 47 36 26 18 53 77 0 0 25 8 40 16 13 53 20 233 -56 24 9 36 26 8 0 23 23 41 26 54 29 78 0 0 25 44 4 16 13 55 19 233 -56 24 45 7 26 43 16 23 59 19 27 29 37 79 0 0 26 19 0 16 13 57 18 233 -57 25 20 12 27 18 3 24 34 30 28 4 18 80 0 0 26 53 29 16 13 59 17 234 -58 25 54 50 27 52 23 25 9 15 28 38 30 81 0 0 27 27 29 16 14 0 16 234 -59 26 28 59 28 26 13 25 43 31 29 12 13 82 0 0 28 0 59 16 14 2 15 235 -59 27 2 39 28 59 34 26 17 19 29 45 27 83 0 0 28 34 0 16 14 3 13 235 -60 27 35 50 29 32 25 26 50 37 30 18 10 84 0 0 29 6 32 16 14 5 12 236 -61 28 8 31 30 4 46 27 23 26 30 50 23 85 0 0 29 38 32 16 14 6 11 236 -61 28 40 42 30 36 37 27 55 44 31 22 5 86 0 0 30 10 2 16 14 7 10 237 -62 29 12 22 31 7 56 28 27 32 31 53 16 87 0 0 30 41 0 16 14 8 9 237 -63 29 43 31 31 38 43 28 58 49 32 23 55 88 0 0 31 11 26 16 14 9 8 238 -63 30 14 8 32 8 59 29 29 35 32 54 2 89 0 0 31 41 21 16 14 10 7 238 -64 30 44 14 32 38 43 29 59 49 33 23 37 90 0 0 32 10 44 16 14 10 6 239 -64 31 13 48 33 7 54 30 29 32 33 52 40 91 0 0 32 39 35 16 14 11 5 239 -64 31 42 49 33 36 34 30 58 42 34 21 11 92 0 0 33 7 53 16 14 11 4 240 -65 32 11 19 34 4 40 31 27 20 34 49 8 93 0 0 33 35 38 16 14 12 4 241 -65 32 39 16 34 32 15 31 55 26 35 16 34 94 0 0 34 2 51 16 14 12 3 241 -65 33 6 40 34 59 16 32 22 59 35 43 26 95 0 0 34 29 32 16 14 12 2 242 -66 33 33 32 35 25 45 32 49 59 36 9 46 96 0 0 34 55 40 16 14 12 1 242 -66 33 59 51 35 51 41 33 16 27 .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 6343-00075-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 47 47.6752 DE: -22 06 47.335 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .041, .028 ) * V mag [mag]: 11.0 * B mag [mag]: 11.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (209) Dido approx. diameter [km]: 179 approx. diameter ["]: .082 distance from Earth [AU]: 3.01400 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1068 number of rejected observations: 135 time covered by the observations: 1909 Jan 09 - 2012 Oct 05 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.010, 69° remarks: * orbital elements for (209) Dido : Mean anomaly = 69.54015421 deg Arg. of pericenter = 249.90186307 deg Long. of node = 0.74549064 deg Inclination = 7.16941082 deg Eccentricity = 0.06068100 Semimajor axis = 3.14509919 AU Perihelion dist = 2.95425144 AU Mag: H = 8.08, G = 0.15 Epoch of elements : MJD 56236.67300000 TDT (2012 Nov 05.673) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 5 209 Dido 16h 9.0m UT 11.0 20 47 47.675-22 6 47.34TYC 6343-00075-1 11.6 14.0 179 9.0 3.014 2.119 14.15 24.4106 -22.117 -66.34 -15.94 16.1497 -0.09467 0.19726 10.09051 4.84820 0.00569 0.00154 2000 68.36099120121030.00000249.901863 0.745491 7.1694110.06068100 3.1450992 2.9542514 8.2 5.00.15 RATE 1.7670660 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.030 88 1.39 0.032 0 0 2 5 056208.0020121105_0075-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 20:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org