IOTA/IOTA-ES occultation update for (2065) Spicer / TYC 6336-01987-1 event on 2012 Oct 23, 14:12 UT Visible from China, India Summary ------- On 2012 Oct 23 UT, the 22 km diameter asteroid (2065) Spicer will occult a 9.7 mag star in the constellation Capricornus for observers along a path across China, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.1 mag to 16.8 mag (the magnitude of the asteroid) for at most 1.3 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: UCAC. The event at a glimpse ---------------------- * Rank: 23 * date and approx. time of event: 2012 Oct 23, 14:12 - 2012 Oct 23, 14:18 UT * geocentric midpoint of event [JD]: 2456224.09188333 * magnitude of target star: 9.7 * magnitude drop [mag]: 7.1 * estimated maximum duration [s]: 1.3 * Moon: 66 % sunlit, 18° distance * Sun: 92° distance * rough path description: China, India The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 2.89 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .058 +/- .042) * 1 sigma uncertainty ellipse (major, minor, PA): ( .059", .040", 75° ) * approx speed of asteroid's shadow [km/s]: 16.2988 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6336-01987-1 by 2065 Spicer on 2012 Oct 23 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 52 0 0 7 41 45 14 12 39 62 166 -1 7 34 28 7 49 3 6 52 32 8 31 22 53 0 0 8 6 1 14 12 46 62 168 -2 7 58 43 8 13 20 7 16 39 8 55 48 54 0 0 8 30 48 14 12 54 61 170 -3 8 23 29 8 38 9 7 41 17 9 20 45 55 0 0 8 56 7 14 13 1 61 172 -4 8 48 46 9 3 29 8 6 26 9 46 13 56 0 0 9 21 56 14 13 9 61 174 -5 9 14 34 9 29 19 8 32 6 10 12 12 57 0 0 9 48 16 14 13 16 60 176 -6 9 40 52 9 55 40 8 58 16 10 38 41 58 0 0 10 15 5 14 13 24 60 178 -7 10 7 39 10 22 31 9 24 56 11 5 39 59 0 0 10 42 23 14 13 31 60 180 -8 10 34 56 10 49 50 9 52 4 11 33 7 60 0 0 11 10 9 14 13 38 59 182 -9 11 2 41 11 17 38 10 19 41 12 1 3 61 0 0 11 38 23 14 13 46 59 184 -10 11 30 54 11 45 53 10 47 46 12 29 27 62 0 0 12 7 4 14 13 53 58 186 -11 11 59 33 12 14 36 11 16 17 12 58 18 63 0 0 12 36 12 14 14 0 57 187 -13 12 28 39 12 43 45 11 45 15 13 27 35 64 0 0 13 5 45 14 14 8 57 189 -14 12 58 11 13 13 20 12 14 39 13 57 18 65 0 0 13 35 43 14 14 15 56 191 -15 13 28 8 13 43 19 12 44 28 14 27 26 66 0 0 14 6 5 14 14 22 55 192 -16 13 58 28 14 13 42 13 14 40 14 57 57 67 0 0 14 36 50 14 14 29 55 194 -17 14 29 12 14 44 29 13 45 16 15 28 52 68 0 0 15 7 58 14 14 36 54 195 -18 15 0 18 15 15 37 14 16 15 16 0 8 69 0 0 15 39 26 14 14 43 53 197 -19 15 31 46 15 47 8 14 47 34 16 31 46 70 0 0 16 11 15 14 14 50 52 198 -20 16 3 33 16 18 58 15 19 15 17 3 45 71 0 0 16 43 24 14 14 57 52 199 -21 16 35 41 16 51 8 15 51 15 17 36 2 72 0 0 17 15 51 14 15 4 51 200 -22 17 8 7 17 23 37 16 23 33 18 8 38 73 0 0 17 48 36 14 15 10 50 202 -23 17 40 50 17 56 22 16 56 9 18 41 31 74 0 0 18 21 37 14 15 17 49 203 -24 18 13 50 18 29 24 17 29 2 19 14 41 75 0 0 18 54 53 14 15 23 48 204 -25 18 47 5 19 2 42 18 2 10 19 48 5 76 0 0 19 28 23 14 15 30 47 205 -26 19 20 34 19 36 13 18 35 33 20 21 43 77 0 0 20 2 7 14 15 36 46 206 -27 19 54 16 20 9 58 19 9 9 20 55 34 78 0 0 20 36 2 14 15 42 45 207 -28 20 28 10 20 43 54 19 42 57 21 29 37 79 0 0 21 10 8 14 15 48 44 208 -29 21 2 16 21 18 1 20 16 56 22 3 50 80 0 0 21 44 24 14 15 54 43 209 -30 21 36 30 21 52 18 20 51 5 22 38 13 81 0 0 22 18 48 14 16 0 43 210 -31 22 10 53 22 26 43 21 25 23 23 12 43 82 0 0 22 53 19 14 16 6 42 211 -32 22 45 23 23 1 15 21 59 48 23 47 21 83 0 0 23 27 56 14 16 12 41 211 -33 23 20 0 23 35 53 22 34 20 24 22 3 84 0 0 24 2 38 14 16 17 40 212 -34 23 54 41 24 10 36 23 8 56 24 56 51 85 0 0 24 37 23 14 16 22 39 213 -35 24 29 25 24 45 22 23 43 36 25 31 41 86 0 0 25 12 10 14 16 28 38 214 -36 25 4 12 25 20 10 24 18 19 26 6 33 87 0 0 25 46 59 14 16 33 37 215 -36 25 39 0 25 54 59 24 53 3 26 41 26 88 0 0 26 21 47 14 16 38 36 215 -37 26 13 47 26 29 48 25 27 48 27 16 18 89 0 0 26 56 34 14 16 42 35 216 -38 26 48 34 27 4 35 26 2 31 27 51 9 90 0 0 27 31 18 14 16 47 34 217 -39 27 23 18 27 39 20 26 37 12 28 25 56 91 0 0 28 5 59 14 16 52 33 217 -40 27 57 57 28 14 0 27 11 50 29 0 39 92 0 0 28 40 34 14 16 56 32 218 -41 28 32 32 28 48 36 27 46 23 29 35 17 93 0 0 29 15 3 14 17 0 31 219 -41 29 7 1 29 23 5 28 20 50 30 9 48 94 0 0 29 49 25 14 17 4 30 220 -42 29 41 23 29 57 27 28 55 10 30 44 11 95 0 0 30 23 38 14 17 8 29 220 -43 30 15 36 30 31 41 29 29 23 31 18 26 96 0 0 30 57 42 14 17 12 28 221 -44 30 49 40 31 5 45 30 3 26 31 52 30 97 0 0 31 31 35 14 17 16 27 222 -44 31 23 33 31 39 38 30 37 19 32 26 23 98 0 0 32 5 16 14 17 19 26 222 -45 31 57 14 32 13 19 31 11 0 33 0 4 99 0 0 32 38 45 14 17 22 25 223 -46 32 30 43 32 46 48 31 44 30 33 33 32 100 0 0 33 12 0 14 17 26 24 224 -46 33 3 58 33 20 2 32 17 46 34 6 46 101 0 0 33 45 0 14 17 29 23 224 -47 33 36 58 33 53 2 32 50 47 34 39 45 102 0 0 34 17 45 14 17 32 22 225 -47 34 9 43 34 25 47 33 23 34 35 12 28 103 0 0 34 50 13 14 17 34 21 226 -48 34 42 12 34 58 15 33 56 4 35 44 53 104 0 0 35 22 24 14 17 37 20 226 -49 35 14 23 35 30 25 34 28 18 36 17 1 105 0 0 35 54 16 14 17 40 19 227 -49 35 46 16 36 2 17 35 0 13 36 48 51 106 0 0 36 25 50 14 17 42 18 228 -50 36 17 50 36 33 50 35 31 51 37 20 21 107 0 0 36 57 4 14 17 44 17 228 -50 36 49 5 37 5 4 36 3 9 37 51 31 108 0 0 37 27 58 14 17 46 16 229 -50 37 19 59 37 35 57 36 34 6 38 22 21 109 0 0 37 58 30 14 17 48 15 229 -51 37 50 33 38 6 29 37 4 44 38 52 49 110 0 0 38 28 42 14 17 50 14 230 -51 38 20 44 38 36 39 37 35 0 39 22 55 111 0 0 38 58 30 14 17 52 13 231 -52 38 50 34 39 6 27 38 4 54 39 52 38 112 0 0 39 27 56 14 17 53 12 231 -52 39 20 1 39 35 53 38 34 25 40 21 59 113 0 0 39 56 59 14 17 55 11 232 -52 39 49 5 40 4 55 39 3 34 40 50 56 114 0 0 40 25 38 14 17 56 10 233 -52 40 17 45 40 33 33 39 32 19 41 19 28 115 0 0 40 53 53 14 17 57 10 233 -53 40 46 1 41 1 47 40 0 41 41 47 37 116 0 0 41 21 44 14 17 58 9 234 -53 41 13 52 41 29 36 40 28 38 42 15 20 117 0 0 41 49 10 14 17 59 8 235 -53 41 41 19 41 57 1 40 56 10 42 42 39 118 0 0 42 16 10 14 18 0 7 235 -53 42 8 20 42 24 0 41 23 18 43 9 32 119 0 0 42 42 45 14 18 1 6 236 -53 42 34 56 42 50 34 41 50 0 43 35 59 120 0 0 43 8 54 14 18 1 5 237 -53 43 1 7 43 16 42 42 16 17 44 2 1 121 0 0 43 34 37 14 18 2 4 238 -54 43 26 51 43 42 24 42 42 8 44 27 36 122 0 0 43 59 55 14 18 2 3 238 -54 43 52 10 44 7 40 43 7 34 44 52 45 123 0 0 44 24 46 14 18 3 3 239 -54 44 17 2 44 32 30 .. .. .. 45 17 28 124 0 0 44 49 10 14 18 3 2 240 -54 44 41 28 44 56 53 .. .. .. 45 41 44 125 0 0 45 13 8 14 18 3 1 240 -54 45 5 27 45 20 50 .. .. .. 46 5 33 126 0 0 45 36 40 14 18 3 0 241 -54 45 29 0 45 44 20 .. .. .. .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2012 Jul 10.0 Data for the target star ------------------------ * name: TYC 6336-01987-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 17 47.5676 DE: -19 47 11.712 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .025 ) * V mag [mag]: 9.7 * B mag [mag]: 11.0 * Apparent position with proper motion RA(deg): 304.6371917160 DE(deg): -19.7442253719 * Equation of equinoxes (radians) : 0.000060574655608 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2065) Spicer approx. diameter [km]: 22 approx. diameter ["]: .014 distance from Earth [AU]: 2.09200 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 806 number of rejected observations: 23 time covered by the observations: 1955 Nov 11 - 2012 May 14 1 sigma uncertainty ellipse (major, minor, PA): 0.052, 0.032, 70° remarks: * orbital elements for (2065) Spicer : Mean anomaly = 315.37630828 deg Arg. of pericenter = 66.70950487 deg Long. of node = 328.13299409 deg Inclination = 6.43099663 deg Eccentricity = 0.23310291 Semimajor axis = 2.69881364 AU Perihelion dist = 2.06971234 AU Mag: H = 12.16, G = 0.15 Epoch of elements : MJD 56223.59200000 TDT (2012 Oct 23.592) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 23 2065 Spicer 14h 12.3m UT 9.7 20 17 47.568-19 47 11.71TYC 6336-01987-1 11.0 16.8 22 1.3 2.092 2.556 13.97 58.9709 -19.790 -37.01 -11.68 14.2052 -0.16974 0.43900 8.57862 3.32241 0.00547 0.00126 2000 314.57779720121020.00000 66.709505328.132994 6.4309970.23310291 2.6988136 2.069712312.2 5.00.15 RATE 2.2230270 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.059 0.040 75 3.89 0.042 0 0-4-2 056118.0020121023_1987-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 26, 05:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org