IOTA/IOTA-ES occultation update for (6959) Mikkelkocha / TYC 6385-00069-1 event on 2012 Sep 05, 03:48 UT Visible from Africa, S USA, N Mexico Summary ------- On 2012 Sep 05 UT, the 13 km diameter asteroid (6959) Mikkelkocha will occult a 9.0 mag star in the constellation Aquarius for observers along a path across Africa, S USA, N Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.5 mag to 15.5 mag (the magnitude of the asteroid) for at most 1.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 9 * date and approx. time of event: 2012 Sep 05, 03:40 - 2012 Sep 05, 03:55 UT * geocentric midpoint of event [JD]: 2456175.6582125 * magnitude of target star: 9.0 * magnitude drop [mag]: 6.5 * estimated maximum duration [s]: 1.2 * Moon: 80 % sunlit, 64° distance * Sun: 168° distance * rough path description: Africa, S USA, N Mexico The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 7.52 * 1 sigma uncertainty interval [seconds]: +/- 9.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .100 +/- .080) * 1 sigma uncertainty ellipse (major, minor, PA): ( .108", .069", 60° ) * approx speed of asteroid's shadow [km/s]: 11.1016 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6385-00069-1 by 6959 Mikkelkocha on 2012 Sep 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 -139 0 0 40 57 54 3 55 13 0 113 -3 41 2 55 40 52 54 .. .. .. .. .. .. -138 0 0 40 38 17 3 55 13 1 114 -4 40 43 18 40 33 17 41 59 23 .. .. .. -137 0 0 40 18 37 3 55 12 2 115 -5 40 23 37 40 13 37 41 39 41 .. .. .. -136 0 0 39 58 54 3 55 12 3 115 -6 40 3 55 39 53 55 41 19 57 .. .. .. -135 0 0 39 39 9 3 55 11 4 116 -6 39 44 9 39 34 10 41 0 10 .. .. .. -134 0 0 39 19 23 3 55 11 4 117 -7 39 24 22 39 14 23 40 40 20 .. .. .. -133 0 0 38 59 35 3 55 10 5 117 -8 39 4 34 38 54 35 40 20 30 .. .. .. -132 0 0 38 39 46 3 55 9 6 118 -9 38 44 45 38 34 47 40 0 38 .. .. .. -131 0 0 38 19 57 3 55 7 7 119 -10 38 24 56 38 14 58 39 40 45 37 0 48 -130 0 0 38 0 8 3 55 6 8 119 -11 38 5 7 37 55 9 39 20 53 36 41 2 -129 0 0 37 40 20 3 55 4 9 120 -12 37 45 19 37 35 21 39 1 1 36 21 18 -128 0 0 37 20 33 3 55 3 9 120 -12 37 25 32 37 15 35 38 41 10 36 1 35 -127 0 0 37 0 48 3 55 1 10 121 -13 37 5 46 36 55 50 38 21 21 35 41 54 -126 0 0 36 41 5 3 54 59 11 122 -14 36 46 3 36 36 7 38 1 33 35 22 16 -125 0 0 36 21 25 3 54 56 12 122 -15 36 26 23 36 16 28 37 41 48 35 2 40 -124 0 0 36 1 48 3 54 54 13 123 -16 36 6 45 35 56 51 37 22 6 34 43 8 -123 0 0 35 42 15 3 54 51 14 123 -17 35 47 12 35 37 18 37 2 28 34 23 40 -122 0 0 35 22 46 3 54 49 15 124 -18 35 27 43 35 17 50 36 42 54 34 4 16 -121 0 0 35 3 22 3 54 46 15 125 -18 35 8 18 34 58 26 36 23 24 33 44 57 -120 0 0 34 44 3 3 54 43 16 125 -19 34 48 59 34 39 7 36 3 59 33 25 44 -119 0 0 34 24 50 3 54 39 17 126 -20 34 29 45 34 19 54 35 44 40 33 6 36 -118 0 0 34 5 43 3 54 36 18 127 -21 34 10 38 34 0 48 35 25 26 32 47 35 -117 0 0 33 46 42 3 54 32 19 127 -22 33 51 37 33 41 48 35 6 20 32 28 41 -116 0 0 33 27 49 3 54 29 20 128 -23 33 32 43 33 22 55 34 47 20 32 9 53 -115 0 0 33 9 3 3 54 25 20 128 -24 33 13 57 33 4 9 34 28 27 31 51 14 -114 0 0 32 50 25 3 54 21 21 129 -25 32 55 19 32 45 32 34 9 43 31 32 43 -113 0 0 32 31 56 3 54 17 22 130 -25 32 36 50 32 27 3 33 51 7 31 14 20 -112 0 0 32 13 36 3 54 12 23 130 -26 32 18 29 32 8 43 33 32 40 30 56 6 -111 0 0 31 55 25 3 54 8 24 131 -27 32 0 17 31 50 33 33 14 22 30 38 2 -110 0 0 31 37 24 3 54 3 25 132 -28 31 42 16 31 32 32 32 56 13 30 20 8 -109 0 0 31 19 33 3 53 58 25 132 -29 31 24 25 31 14 42 32 38 15 30 2 23 -108 0 0 31 1 53 3 53 53 26 133 -30 31 6 44 30 57 2 32 20 28 29 44 50 -107 0 0 30 44 24 3 53 48 27 134 -31 30 49 14 30 39 33 32 2 51 29 27 28 -106 0 0 30 27 6 3 53 42 28 134 -32 30 31 56 30 22 16 31 45 26 29 10 17 -105 0 0 30 10 0 3 53 37 29 135 -32 30 14 50 30 5 10 31 28 13 28 53 18 -104 0 0 29 53 6 3 53 31 29 136 -33 29 57 55 29 48 17 31 11 11 28 36 31 -103 0 0 29 36 25 3 53 26 30 137 -34 29 41 14 29 31 36 30 54 23 28 19 57 -102 0 0 29 19 57 3 53 20 31 137 -35 29 24 45 29 15 9 30 37 47 28 3 36 -101 0 0 29 3 42 3 53 14 32 138 -36 29 8 30 28 58 54 30 21 25 27 47 28 -100 0 0 28 47 41 3 53 7 33 139 -37 28 52 28 28 42 53 30 5 16 27 31 34 - 99 0 0 28 31 53 3 53 1 33 140 -38 28 36 41 28 27 7 29 49 21 27 15 54 - 98 0 0 28 16 21 3 52 55 34 140 -38 28 21 7 28 11 34 29 33 41 27 0 28 - 97 0 0 28 1 2 3 52 48 35 141 -39 28 5 49 27 56 16 29 18 15 26 45 17 - 96 0 0 27 45 59 3 52 41 36 142 -40 27 50 45 27 41 14 29 3 5 26 30 20 - 95 0 0 27 31 11 3 52 35 36 143 -41 27 35 56 27 26 26 28 48 9 26 15 39 - 94 0 0 27 16 39 3 52 28 37 144 -42 27 21 23 27 11 54 28 33 30 26 1 14 - 93 0 0 27 2 22 3 52 21 38 145 -43 27 7 6 26 57 38 28 19 6 25 47 4 - 92 0 0 26 48 21 3 52 13 38 145 -43 26 53 5 26 43 38 28 4 58 25 33 10 - 91 0 0 26 34 37 3 52 6 39 146 -44 26 39 21 26 29 54 27 51 7 25 19 33 - 90 0 0 26 21 10 3 51 59 40 147 -45 26 25 53 26 16 27 27 37 33 25 6 12 - 89 0 0 26 7 59 3 51 51 40 148 -46 26 12 42 26 3 17 27 24 16 24 53 8 - 88 0 0 25 55 6 3 51 44 41 149 -47 25 59 48 25 50 24 27 11 16 24 40 20 - 87 0 0 25 42 30 3 51 36 42 150 -47 25 47 12 25 37 48 26 58 33 24 27 51 - 86 0 0 25 30 12 3 51 28 42 151 -48 25 34 53 25 25 30 26 46 8 24 15 38 - 85 0 0 25 18 11 3 51 20 43 152 -49 25 22 52 25 13 30 26 34 1 24 3 44 - 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69 0 0 22 49 1 3 49 5 50 172 -59 22 53 37 22 44 25 24 3 29 21 35 51 - 68 0 0 22 42 30 3 48 56 50 173 -59 22 47 6 22 37 54 23 56 55 21 29 24 - 67 0 0 22 36 20 3 48 48 50 175 -59 22 40 56 22 31 45 23 50 42 21 23 17 - 66 0 0 22 30 31 3 48 39 50 176 -60 22 35 7 22 25 56 23 44 49 21 17 31 - 65 0 0 22 25 3 3 48 30 50 178 -60 22 29 38 22 20 28 23 39 18 21 12 5 - 64 0 0 22 19 55 3 48 21 50 179 -60 22 24 31 22 15 20 23 34 8 21 7 1 - 63 0 0 22 15 9 3 48 12 50 180 -61 22 19 44 22 10 34 23 29 18 21 2 17 - 62 0 0 22 10 43 3 48 3 51 182 -61 22 15 18 22 6 9 23 24 51 20 57 53 - 61 0 0 22 6 39 3 47 54 51 183 -61 22 11 14 22 2 4 23 20 44 20 53 51 - 60 0 0 22 2 56 3 47 45 51 185 -61 22 7 30 21 58 21 23 16 59 20 50 10 - 59 0 0 21 59 34 3 47 36 51 186 -61 22 4 8 21 54 59 23 13 35 20 46 50 - 58 0 0 21 56 33 3 47 27 50 188 -61 22 1 7 21 51 59 23 10 32 20 43 50 - 57 0 0 21 53 54 3 47 18 50 189 -62 21 58 28 21 49 20 23 7 52 20 41 12 - 56 0 0 21 51 36 3 47 9 50 190 -62 21 56 10 21 47 2 23 5 32 20 38 56 - 55 0 0 21 49 39 3 47 0 50 192 -62 21 54 13 21 45 5 23 3 35 20 37 0 - 54 0 0 21 48 4 3 46 51 50 193 -61 21 52 38 21 43 30 23 1 59 20 35 26 - 53 0 0 21 46 50 3 46 42 50 195 -61 21 51 24 21 42 16 23 0 45 20 34 12 - 52 0 0 21 45 58 3 46 33 50 196 -61 21 50 32 21 41 24 22 59 52 20 33 21 - 51 0 0 21 45 27 3 46 25 49 197 -61 21 50 2 21 40 54 22 59 21 20 32 50 - 50 0 0 21 45 18 3 46 16 49 199 -61 21 49 53 21 40 45 22 59 12 20 32 41 - 49 0 0 21 45 31 3 46 7 49 200 -61 21 50 5 21 40 57 22 59 25 20 32 53 - 48 0 0 21 46 5 3 45 58 48 201 -60 21 50 39 21 41 31 23 0 0 20 33 27 - 47 0 0 21 47 1 3 45 50 48 203 -60 21 51 35 21 42 27 23 0 56 20 34 22 - 46 0 0 21 48 18 3 45 41 48 204 -60 21 52 52 21 43 44 23 2 14 20 35 38 - 45 0 0 21 49 57 3 45 33 47 205 -59 21 54 31 21 45 22 23 3 54 20 37 16 - 44 0 0 21 51 57 3 45 24 47 206 -59 21 56 31 21 47 23 23 5 56 20 39 15 - 43 0 0 21 54 19 3 45 16 46 208 -59 21 58 53 21 49 44 23 8 19 20 41 35 - 42 0 0 21 57 2 3 45 7 46 209 -58 22 1 37 21 52 28 23 11 4 20 44 17 - 41 0 0 22 0 7 3 44 59 45 210 -58 22 4 42 21 55 32 23 14 11 20 47 20 - 40 0 0 22 3 33 3 44 51 45 211 -57 22 8 8 21 58 59 23 17 39 20 50 44 - 39 0 0 22 7 21 3 44 42 44 212 -57 22 11 56 22 2 46 23 21 30 20 54 30 - 38 0 0 22 11 30 3 44 34 44 213 -56 22 16 5 22 6 55 23 25 41 20 58 36 - 37 0 0 22 16 0 3 44 26 43 214 -55 22 20 36 22 11 25 23 30 14 21 3 4 - 36 0 0 22 20 52 3 44 18 43 215 -55 22 25 28 22 16 17 23 35 9 21 7 53 - 35 0 0 22 26 5 3 44 10 42 216 -54 22 30 41 22 21 30 23 40 25 21 13 3 - 34 0 0 22 31 39 3 44 3 42 217 -54 22 36 15 22 27 3 23 46 3 21 18 34 - 33 0 0 22 37 34 3 43 55 41 218 -53 22 42 10 22 32 58 23 52 2 21 24 25 - 32 0 0 22 43 50 3 43 47 40 219 -52 22 48 27 22 39 14 23 58 22 21 30 38 - 31 0 0 22 50 28 3 43 40 40 220 -52 22 55 4 22 45 51 24 5 3 21 37 11 - 30 0 0 22 57 26 3 43 32 39 221 -51 23 2 3 22 52 49 24 12 5 21 44 6 - 29 0 0 23 4 44 3 43 25 38 222 -50 23 9 22 23 0 8 24 19 28 21 51 20 - 28 0 0 23 12 24 3 43 18 38 222 -49 23 17 1 23 7 47 24 27 12 21 58 55 - 27 0 0 23 20 24 3 43 11 37 223 -49 23 25 2 23 15 46 24 35 17 22 6 51 - 26 0 0 23 28 44 3 43 4 36 224 -48 23 33 22 23 24 7 24 43 42 22 15 7 - 25 0 0 23 37 25 3 42 57 35 225 -47 23 42 3 23 32 47 24 52 28 22 23 43 - 24 0 0 23 46 26 3 42 50 35 226 -46 23 51 5 23 41 48 25 1 34 22 32 39 - 23 0 0 23 55 47 3 42 44 34 226 -46 24 0 26 23 51 8 25 11 1 22 41 54 - 22 0 0 24 5 28 3 42 37 33 227 -45 24 10 7 24 0 49 25 20 47 22 51 30 - 21 0 0 24 15 29 3 42 31 32 228 -44 24 20 8 24 10 49 25 30 54 23 1 25 - 20 0 0 24 25 49 3 42 24 32 228 -43 24 30 29 24 21 9 25 41 20 23 11 40 - 19 0 0 24 36 29 3 42 18 31 229 -42 24 41 9 24 31 49 25 52 6 23 22 14 - 18 0 0 24 47 28 3 42 12 30 230 -42 24 52 9 24 42 48 26 3 11 23 33 8 - 17 0 0 24 58 46 3 42 7 29 230 -41 25 3 28 24 54 6 26 14 36 23 44 20 - 16 0 0 25 10 24 3 42 1 29 231 -40 25 15 5 25 5 42 26 26 19 23 55 51 - 15 0 0 25 22 20 3 41 55 28 232 -39 25 27 1 25 17 38 26 38 22 24 7 41 - 14 0 0 25 34 34 3 41 50 27 232 -38 25 39 16 25 29 52 26 50 43 24 19 49 - 13 0 0 25 47 7 3 41 45 26 233 -37 25 51 50 25 42 24 27 3 23 24 32 15 - 12 0 0 25 59 58 3 41 40 25 234 -36 26 4 41 25 55 15 27 16 21 24 45 0 - 11 0 0 26 13 7 3 41 35 24 234 -36 26 17 50 26 8 23 27 29 36 24 58 2 - 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Uncertainty in time = +/- 11 secs Prediction of 2012 Jul 20.0 Data for the target star ------------------------ * name: TYC 6385-00069-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 33 05.9306 DE: -17 25 59.755 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .039, .041 ) * V mag [mag]: 9.0 * B mag [mag]: 10.6 * Apparent position with proper motion RA(deg): 338.4545710633 DE(deg): -17.3636990165 * Equation of equinoxes (radians) : 0.000068834166513 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6959) Mikkelkocha approx. diameter [km]: 13 approx. diameter ["]: .011 distance from Earth [AU]: 1.58300 * orbital information: orbit source: Preston date of fit: 2012 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 745 number of rejected observations: 9 time covered by the observations: 1953 Aug 14 - 2011 May 10 1 sigma uncertainty ellipse (major, minor, PA): 0.102, 0.057, 56° remarks: * orbital elements for (6959) Mikkelkocha : Mean anomaly = 7.94162830 deg Arg. of pericenter = 329.28640579 deg Long. of node = 357.32599838 deg Inclination = 13.47302115 deg Eccentricity = 0.11057318 Semimajor axis = 2.89373405 AU Perihelion dist = 2.57376469 AU Mag: H = 11.96, G = 0.15 Epoch of elements : MJD 56175.15800000 TDT (2012 Sep 05.158) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 5 6959 Mikkelkocha 3h 47.8m UT 9.0 22 33 5.931-17 25 59.76TYC 6385-00069-1 10.6 15.5 13 1.2 1.583 -2.426 2.34 -63.3429 -17.433 122.71 6.68 3.7971 0.04271 0.63293 -6.25195 0.42037 0.00054 0.00101 2000 6.9088732012 831.00000329.286406357.325998 13.4730210.11057318 2.8937341 2.573764712.0 5.00.15 RATE 2.0022400 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.108 0.069 60 8.52 0.083 0 0-4 5 056128.0020120905_0069-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 20, 04:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org