IOTA/IOTA-ES occultation update for (991) McDonalda / TYC 1881-01547-1 event on 2012 Dec 08, 00:24 UT Visible from SW Asia, Europe, E USA Summary ------- On 2012 Dec 08 UT, the 31 km diameter asteroid (991) McDonalda will occult a 9.6 mag star in the constellation Gemini for observers along a path across SW Asia, Europe, E USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 16.2 mag (the magnitude of the asteroid) for at most 2.4 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: 26 * date and approx. time of event: 2012 Dec 08, 00:17 - 2012 Dec 08, 00:31 UT * geocentric midpoint of event [JD]: 2456269.5168125 * magnitude of target star: 9.6 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 2.4 * Moon: 35 % sunlit, 90° distance * Sun: 163° distance * rough path description: SW Asia, Europe, E USA The occultation path -------------------- * approximate projected width [km]: 37 * 1 sigma uncertainty interval [path widths]: +/- 2.55 * 1 sigma uncertainty interval [seconds]: +/- 6.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .059 +/- .046) * 1 sigma uncertainty ellipse (major, minor, PA): ( .059", .046", 90° ) * approx speed of asteroid's shadow [km/s]: 13.8950 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1881-01547-1 by 991 McDonalda on 2012 Dec 8 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 - 95 0 0 28 4 35 0 31 2 0 62 -14 28 15 53 .. .. .. 29 13 53 .. .. .. - 94 0 0 28 33 0 0 31 2 1 62 -15 28 44 19 28 21 43 29 42 19 .. .. .. - 93 0 0 29 1 19 0 31 1 2 63 -16 29 12 38 28 50 2 30 10 38 .. .. .. - 92 0 0 29 29 31 0 31 1 3 63 -17 29 40 49 29 18 13 30 38 50 .. .. .. - 91 0 0 29 57 34 0 31 1 4 64 -18 30 8 52 29 46 16 31 6 52 .. .. .. - 90 0 0 30 25 28 0 31 0 5 64 -19 30 36 46 30 14 11 31 34 46 .. .. .. - 89 0 0 30 53 13 0 30 59 6 65 -20 31 4 31 30 41 56 32 2 29 29 44 42 - 88 0 0 31 20 47 0 30 58 7 65 -21 31 32 5 31 9 30 32 30 3 30 12 18 - 87 0 0 31 48 11 0 30 57 8 66 -22 31 59 28 31 36 54 32 57 24 30 39 43 - 86 0 0 32 15 23 0 30 56 9 66 -23 32 26 40 32 4 7 33 24 34 31 6 57 - 85 0 0 32 42 23 0 30 54 10 67 -24 32 53 40 32 31 7 33 51 32 31 34 0 - 84 0 0 33 9 10 0 30 53 11 68 -25 33 20 26 32 57 55 34 18 16 32 0 50 - 83 0 0 33 35 44 0 30 51 12 68 -26 33 47 0 33 24 29 34 44 47 32 27 26 - 82 0 0 34 2 4 0 30 49 13 69 -27 34 13 19 33 50 50 35 11 4 32 53 50 - 81 0 0 34 28 10 0 30 47 13 69 -28 34 39 24 34 16 56 35 37 6 33 19 59 - 80 0 0 34 54 0 0 30 45 14 70 -28 35 5 15 34 42 47 36 2 53 33 45 54 - 79 0 0 35 19 36 0 30 43 15 70 -29 35 30 49 35 8 24 36 28 24 34 11 33 - 78 0 0 35 44 56 0 30 41 16 71 -30 35 56 8 35 33 44 36 53 39 34 36 57 - 77 0 0 36 9 59 0 30 39 17 72 -31 36 21 11 35 58 48 37 18 38 35 2 5 - 76 0 0 36 34 46 0 30 36 18 72 -32 36 45 57 36 23 36 37 43 20 35 26 57 - 75 0 0 36 59 15 0 30 34 19 73 -33 37 10 26 36 48 6 38 7 44 35 51 32 - 74 0 0 37 23 28 0 30 31 20 74 -33 37 34 37 37 12 19 38 31 51 36 15 49 - 73 0 0 37 47 22 0 30 28 21 74 -34 37 58 31 37 36 15 38 55 40 36 39 49 - 72 0 0 38 10 59 0 30 25 21 75 -35 38 22 6 37 59 52 39 19 10 37 3 32 - 71 0 0 38 34 16 0 30 23 22 76 -36 38 45 23 38 23 11 39 42 22 37 26 56 - 70 0 0 38 57 16 0 30 20 23 76 -37 39 8 21 38 46 11 40 5 15 37 50 1 - 69 0 0 39 19 56 0 30 16 24 77 -37 39 31 1 39 8 53 40 27 48 38 12 48 - 68 0 0 39 42 17 0 30 13 25 78 -38 39 53 20 39 31 15 40 50 3 38 35 15 - 67 0 0 40 4 19 0 30 10 26 78 -39 40 15 21 39 53 18 41 11 57 38 57 24 - 66 0 0 40 26 1 0 30 7 26 79 -40 40 37 2 40 15 1 41 33 32 39 19 13 - 65 0 0 40 47 23 0 30 3 27 80 -40 40 58 23 40 36 24 41 54 47 39 40 42 - 64 0 0 41 8 25 0 30 0 28 81 -41 41 19 24 40 57 27 42 15 42 40 1 51 - 63 0 0 41 29 7 0 29 56 29 81 -42 41 40 4 41 18 10 42 36 16 40 22 40 - 62 0 0 41 49 28 0 29 53 30 82 -42 42 0 25 41 38 33 42 56 30 40 43 9 - 61 0 0 42 9 30 0 29 49 30 83 -43 42 20 25 41 58 36 43 16 24 41 3 18 - 60 0 0 42 29 10 0 29 46 31 84 -44 42 40 4 42 18 18 43 35 56 41 23 7 - 59 0 0 42 48 30 0 29 42 32 85 -45 42 59 23 42 37 39 43 55 9 41 42 34 - 58 0 0 43 7 30 0 29 38 33 85 -45 43 18 21 42 56 40 44 14 0 42 1 41 - 57 0 0 43 26 8 0 29 34 33 86 -46 43 36 58 43 15 20 44 32 30 42 20 28 - 56 0 0 43 44 26 0 29 30 34 87 -46 43 55 15 43 33 39 44 50 40 42 38 53 - 55 0 0 44 2 23 0 29 26 35 88 -47 44 13 10 43 51 37 45 8 29 42 56 58 - 54 0 0 44 19 59 0 29 22 36 89 -48 44 30 45 44 9 14 45 25 56 43 14 42 - 53 0 0 44 37 14 0 29 18 36 90 -48 44 47 59 44 26 31 45 43 3 43 32 5 - 52 0 0 44 54 8 0 29 14 37 91 -49 45 4 52 44 43 26 45 59 49 43 49 8 - 51 0 0 45 10 42 0 29 10 38 92 -49 45 21 23 45 0 1 46 16 14 44 5 49 - 50 0 0 45 26 54 0 29 6 38 93 -50 45 37 35 45 16 15 46 32 18 44 22 9 - 49 0 0 45 42 46 0 29 2 39 93 -50 45 53 25 45 32 7 46 48 2 44 38 9 - 48 0 0 45 58 16 0 28 58 40 94 -51 46 8 54 45 47 39 47 3 24 44 53 48 - 47 0 0 46 13 26 0 28 54 40 95 -52 46 24 3 46 2 51 47 18 26 45 9 5 - 46 0 0 46 28 15 0 28 49 41 96 -52 46 38 51 46 17 41 47 33 7 45 24 3 - 45 0 0 46 42 44 0 28 45 42 97 -53 46 53 18 46 32 11 47 47 28 45 38 39 - 44 0 0 46 56 52 0 28 41 42 98 -53 47 7 24 46 46 20 48 1 27 45 52 55 - 43 0 0 47 10 39 0 28 37 43 99 -53 47 21 10 47 0 9 48 15 7 46 6 50 - 42 0 0 47 24 6 0 28 32 43 100 -54 47 34 36 47 13 37 48 28 26 46 20 24 - 41 0 0 47 37 12 0 28 28 44 101 -54 47 47 41 47 26 44 48 41 24 46 33 38 - 40 0 0 47 49 58 0 28 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8 36 51 48 37 52 59 49 50 57 56 3 0 0 51 58 2 0 25 5 62 165 -59 52 8 2 51 48 3 52 59 15 50 57 20 4 0 0 51 57 9 0 25 0 62 167 -59 52 7 10 51 47 10 52 58 24 50 56 28 5 0 0 51 56 0 0 24 55 62 169 -59 52 6 0 51 46 0 52 57 15 50 55 17 6 0 0 51 54 32 0 24 50 62 171 -59 52 4 32 51 44 32 52 55 49 50 53 48 7 0 0 51 52 47 0 24 45 63 173 -59 52 2 47 51 42 47 52 54 5 50 52 2 8 0 0 51 50 44 0 24 41 63 175 -58 52 0 45 51 40 44 52 52 3 50 49 57 9 0 0 51 48 23 0 24 36 63 177 -58 51 58 24 51 38 23 52 49 45 50 47 34 10 0 0 51 45 45 0 24 31 63 179 -58 51 55 46 51 35 44 52 47 8 50 44 54 11 0 0 51 42 49 0 24 26 63 181 -57 51 52 50 51 32 47 52 44 14 50 41 56 12 0 0 51 39 34 0 24 21 63 183 -57 51 49 37 51 29 33 52 41 3 50 38 39 13 0 0 51 36 2 0 24 16 63 185 -57 51 46 5 51 26 1 52 37 34 50 35 4 14 0 0 51 32 13 0 24 11 63 187 -56 51 42 16 51 22 10 52 33 47 50 31 12 15 0 0 51 28 5 0 24 6 63 189 -56 51 38 8 51 18 2 52 29 42 50 27 1 16 0 0 51 23 39 0 24 1 63 191 -56 51 33 43 51 13 35 52 25 19 50 22 31 17 0 0 51 18 55 0 23 56 63 193 -55 51 29 0 51 8 51 52 20 39 50 17 44 18 0 0 51 13 53 0 23 51 63 195 -55 51 23 58 51 3 48 52 15 41 50 12 38 19 0 0 51 8 32 0 23 46 63 197 -55 51 18 39 50 58 27 52 10 25 50 7 14 20 0 0 51 2 54 0 23 41 63 198 -54 51 13 1 50 52 48 52 4 50 50 1 31 21 0 0 50 56 57 0 23 36 62 200 -54 51 7 5 50 46 50 51 58 58 49 55 30 22 0 0 50 50 42 0 23 31 62 202 -54 51 0 50 50 40 34 51 52 47 49 49 10 23 0 0 50 44 8 0 23 26 62 204 -53 50 54 17 50 34 0 51 46 18 49 42 32 24 0 0 50 37 16 0 23 21 62 206 -53 50 47 26 50 27 7 51 39 31 49 35 35 25 0 0 50 30 5 0 23 16 62 208 -52 50 40 16 50 19 55 51 32 25 49 28 19 26 0 0 50 22 35 0 23 11 62 210 -52 50 32 47 50 12 24 51 25 1 49 20 44 27 0 0 50 14 47 0 23 6 61 212 -51 50 24 59 50 4 35 51 17 18 49 12 50 28 0 0 50 6 39 0 23 1 61 214 -51 50 16 53 49 56 27 51 9 16 49 4 37 29 0 0 49 58 13 0 22 56 61 216 -50 50 8 28 49 48 0 51 0 56 48 56 5 30 0 0 49 49 28 0 22 51 61 217 -50 49 59 43 49 39 14 50 52 17 48 47 14 31 0 0 49 40 24 0 22 46 60 219 -49 49 50 40 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46 45 6 0 21 28 55 244 -41 46 55 40 46 34 33 47 49 50 45 41 1 47 0 0 46 30 45 0 21 23 54 245 -40 46 41 20 46 20 10 47 35 37 45 26 31 48 0 0 46 16 3 0 21 18 54 246 -40 46 26 39 46 5 27 47 21 3 45 11 42 49 0 0 46 1 0 0 21 13 53 248 -39 46 11 38 45 50 24 47 6 9 44 56 32 50 0 0 45 45 38 0 21 7 53 249 -39 45 56 17 45 34 59 46 50 54 44 41 1 51 0 0 45 29 54 0 21 2 52 250 -38 45 40 35 45 19 15 46 35 19 44 25 10 52 0 0 45 13 50 0 20 57 51 252 -37 45 24 32 45 3 9 46 19 23 44 8 58 53 0 0 44 57 26 0 20 52 51 253 -37 45 8 9 44 46 44 46 3 6 43 52 25 54 0 0 44 40 41 0 20 46 50 254 -36 44 51 25 44 29 57 45 46 29 43 35 33 55 0 0 44 23 35 0 20 41 50 255 -35 44 34 21 44 12 50 45 29 32 43 18 19 56 0 0 44 6 9 0 20 36 49 257 -35 44 16 56 43 55 23 45 12 14 43 0 45 57 0 0 43 48 22 0 20 31 48 258 -34 43 59 10 43 37 35 44 54 35 42 42 51 58 0 0 43 30 15 0 20 26 48 259 -33 43 41 5 43 19 26 44 36 36 42 24 36 59 0 0 43 11 47 0 20 21 47 260 -32 43 22 38 43 0 57 44 18 16 42 6 0 60 0 0 42 52 59 0 20 15 47 261 -32 43 3 51 42 42 8 43 59 36 41 47 4 61 0 0 42 33 51 0 20 10 46 262 -31 42 44 44 42 22 58 43 40 35 41 27 49 62 0 0 42 14 22 0 20 5 45 263 -30 42 25 17 42 3 28 43 21 14 41 8 12 63 0 0 41 54 33 0 20 0 45 265 -29 42 5 29 41 43 38 43 1 33 40 48 16 64 0 0 41 34 24 0 19 55 44 266 -29 41 45 21 41 23 28 42 41 31 40 28 0 65 0 0 41 13 55 0 19 50 43 267 -28 41 24 54 41 2 58 42 21 10 40 7 24 66 0 0 40 53 7 0 19 45 42 268 -27 41 4 6 40 42 9 42 0 29 39 46 29 67 0 0 40 31 59 0 19 40 42 269 -26 40 42 59 40 20 59 41 39 27 39 25 14 68 0 0 40 10 31 0 19 35 41 269 -26 40 21 33 39 59 30 41 18 7 39 3 39 69 0 0 39 48 44 0 19 30 40 270 -25 39 59 47 39 37 42 40 56 27 38 41 46 70 0 0 39 26 38 0 19 25 39 271 -24 39 37 42 39 15 35 40 34 27 38 19 33 71 0 0 39 4 13 0 19 21 39 272 -23 39 15 18 38 53 10 40 12 9 37 57 2 72 0 0 38 41 30 0 19 16 38 273 -22 38 52 36 38 30 25 39 49 32 37 34 13 73 0 0 38 18 28 0 19 11 37 274 -21 38 29 35 38 7 23 39 26 36 37 11 6 74 0 0 37 55 9 0 19 7 36 275 -21 38 6 16 37 44 2 39 3 22 36 47 40 75 0 0 37 31 31 0 19 2 35 276 -20 37 42 40 37 20 24 38 39 50 36 23 57 76 0 0 37 7 36 0 18 57 35 276 -19 37 18 46 36 56 28 38 16 0 35 59 57 77 0 0 36 43 24 0 18 53 34 277 -18 36 54 35 36 32 15 37 51 53 35 35 40 78 0 0 36 18 56 0 18 49 33 278 -17 36 30 7 36 7 46 37 27 30 35 11 7 79 0 0 35 54 10 0 18 44 32 279 -16 36 5 22 35 43 0 37 2 49 34 46 18 80 0 0 35 29 10 0 18 40 31 280 -15 35 40 22 35 17 58 36 37 52 34 21 12 81 0 0 35 3 53 0 18 36 30 280 -15 35 15 6 34 52 41 36 12 40 33 55 52 82 0 0 34 38 21 0 18 32 30 281 -14 34 49 35 34 27 9 35 47 12 33 30 17 83 0 0 34 12 35 0 18 28 29 282 -13 34 23 50 34 1 22 35 21 29 33 4 27 84 0 0 33 46 35 0 18 24 28 282 -12 33 57 50 33 35 21 34 55 32 32 38 24 85 0 0 33 20 21 0 18 20 27 283 -11 33 31 37 33 9 7 34 29 21 32 12 7 86 0 0 32 53 54 0 18 16 26 284 -10 33 5 10 32 42 40 34 2 57 31 45 38 87 0 0 32 27 15 0 18 12 25 284 -9 32 38 31 32 16 0 33 36 20 31 18 56 88 0 0 32 0 23 0 18 9 24 285 -8 32 11 40 31 49 8 33 9 30 30 52 3 89 0 0 31 33 20 0 18 5 23 286 -7 31 44 37 31 22 5 32 42 29 30 24 58 90 0 0 31 6 7 0 18 2 22 286 -6 31 17 24 30 54 51 32 15 16 29 57 43 91 0 0 30 38 43 0 17 59 21 287 -5 30 50 0 30 27 27 31 47 53 29 30 18 92 0 0 30 11 9 0 17 56 20 287 -4 30 22 27 29 59 53 31 20 21 29 2 44 93 0 0 29 43 27 0 17 53 19 288 -3 29 54 44 29 32 11 30 52 39 28 35 2 94 0 0 29 15 37 0 17 50 18 288 -2 29 26 54 29 4 21 30 24 48 28 7 11 95 0 0 28 47 39 0 17 47 18 289 -1 28 58 56 28 36 23 29 56 50 27 39 14 96 0 0 28 19 34 0 17 45 17 289 0 28 30 51 28 8 18 29 28 45 27 11 10 Uncertainty in time = +/- 8 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 1881-01547-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 14 58.4402 DE: +24 36 58.107 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .047, .040 ) * V mag [mag]: 9.6 * B mag [mag]: 11.6 * Diameter [mas]: 1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (991) McDonalda approx. diameter [km]: 31 approx. diameter ["]: .017 distance from Earth [AU]: 2.46300 * orbital information: orbit source: Preston date of fit: 2012 Oct 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1517 number of rejected observations: 27 time covered by the observations: 1936 Mar 18 - 2012 Feb 02 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.022, 90° remarks: * orbital elements for (991) McDonalda : Mean anomaly = 115.72258699 deg Arg. of pericenter = 254.90953933 deg Long. of node = 63.36796384 deg Inclination = 2.07239346 deg Eccentricity = 0.15394321 Semimajor axis = 3.15116872 AU Perihelion dist = 2.66606768 AU Mag: H = 11.08, G = 0.15 Epoch of elements : MJD 56269.01700000 TDT (2012 Dec 08.017) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 8 991 McDonalda 0h 24.2m UT 9.6 6 14 58.440 24 36 58.11TYC 1881-01547-1 11.6 16.2 33 2.4 2.463 -2.049 2.03 10.5190 24.616 171.92 -22.73 0.4035 0.03248 0.44966 -7.82202 0.56968 -0.00184 -0.00007 2000 114.13382620121129.00000254.909539 63.367964 2.0723930.15394321 3.1511687 2.666067711.1 5.00.15 RATE 1.7619620 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.059 0.046 90 3.55 0.047 0 1 2-3 056264.0020121208_1547-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 23:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org