IOTA/IOTA-ES occultation update for (962) Aslog / UCAC2 23940468 event on 2009 Jun 08, 04:12 UT Visible from Summary ------- On 2009 Jun 08 UT, the 39 km diameter asteroid (962) Aslog will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 15.7 mag (the magnitude of the asteroid) for at most 3.5 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: 36 * date and approx. time of event: 2009 Jun 08, 04:06 - 2009 Jun 08, 04:19 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 4.3 * estimated maximum duration [s]: 3.5 * Moon: 100 % sunlit, 11° distance * Sun: 166° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 1.85 * 1 sigma uncertainty interval [seconds]: +/- 8.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .068 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .068", .052", 91° ) * approx speed of asteroid's shadow [km/s]: 11.2056 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 23940468 by 962 Aslog on 2009 Jun 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 -122 0 0 39 44 35 4 19 37 0 117 -8 40 1 4 39 28 11 .. .. .. .. .. .. -121 0 0 39 21 33 4 19 37 1 117 -9 39 38 1 39 5 11 40 39 39 .. .. .. -120 0 0 38 58 36 4 19 36 2 118 -10 39 15 2 38 42 15 40 16 33 .. .. .. -119 0 0 38 35 44 4 19 36 3 119 -11 38 52 8 38 19 26 39 53 32 .. .. .. -118 0 0 38 12 59 4 19 35 4 119 -11 38 29 21 37 56 42 39 30 38 .. .. .. -117 0 0 37 50 21 4 19 34 5 120 -12 38 6 40 37 34 6 39 7 50 .. .. .. -116 0 0 37 27 50 4 19 33 6 120 -13 37 44 8 37 11 37 38 45 9 36 12 17 -115 0 0 37 5 27 4 19 32 6 121 -14 37 21 43 36 49 16 38 22 37 35 50 4 -114 0 0 36 43 13 4 19 31 7 122 -15 36 59 27 36 27 4 38 0 13 35 27 59 -113 0 0 36 21 9 4 19 29 8 122 -16 36 37 20 36 5 2 37 37 59 35 6 4 -112 0 0 35 59 14 4 19 27 9 123 -16 36 15 24 35 43 10 37 15 54 34 44 20 -111 0 0 35 37 31 4 19 25 10 124 -17 35 53 38 35 21 28 36 54 0 34 22 46 -110 0 0 35 15 59 4 19 23 11 124 -18 35 32 4 34 59 58 36 32 17 34 1 23 -109 0 0 34 54 38 4 19 21 12 125 -19 35 10 41 34 38 40 36 10 46 33 40 13 -108 0 0 34 33 30 4 19 18 13 125 -20 34 49 31 34 17 34 35 49 27 33 19 15 -107 0 0 34 12 35 4 19 15 13 126 -21 34 28 33 33 56 41 35 28 21 32 58 30 -106 0 0 33 51 53 4 19 13 14 127 -21 34 7 50 33 36 2 35 7 29 32 37 58 -105 0 0 33 31 26 4 19 9 15 127 -22 33 47 20 33 15 36 34 46 51 32 17 41 -104 0 0 33 11 13 4 19 6 16 128 -23 33 27 5 32 55 25 34 26 27 31 57 38 -103 0 0 32 51 15 4 19 3 17 128 -24 33 7 4 32 35 30 34 6 18 31 37 50 -102 0 0 32 31 32 4 18 59 18 129 -24 32 47 20 32 15 50 33 46 24 31 18 18 -101 0 0 32 12 6 4 18 55 19 130 -25 32 27 51 31 56 25 33 26 47 30 59 2 -100 0 0 31 52 56 4 18 51 19 130 -26 32 8 39 31 37 18 33 7 26 30 40 2 - 99 0 0 31 34 3 4 18 47 20 131 -27 31 49 43 31 18 27 32 48 22 30 21 19 - 98 0 0 31 15 27 4 18 43 21 131 -27 31 31 6 30 59 53 32 29 36 30 2 54 - 97 0 0 30 57 9 4 18 38 22 132 -28 31 12 45 30 41 37 32 11 7 29 44 46 - 96 0 0 30 39 9 4 18 34 23 133 -29 30 54 43 30 23 40 31 52 57 29 26 56 - 95 0 0 30 21 28 4 18 29 24 133 -30 30 37 0 30 6 1 31 35 5 29 9 25 - 94 0 0 30 4 6 4 18 24 24 134 -30 30 19 35 29 48 41 31 17 32 28 52 12 - 93 0 0 29 47 3 4 18 19 25 135 -31 30 2 30 29 31 40 31 0 19 28 35 19 - 92 0 0 29 30 19 4 18 14 26 135 -32 29 45 45 29 14 58 30 43 25 28 18 45 - 91 0 0 29 13 56 4 18 8 27 136 -32 29 29 19 28 58 37 30 26 52 28 2 31 - 90 0 0 28 57 53 4 18 3 28 137 -33 29 13 14 28 42 35 30 10 39 27 46 37 - 89 0 0 28 42 10 4 17 57 28 137 -34 28 57 29 28 26 55 29 54 46 27 31 3 - 88 0 0 28 26 48 4 17 51 29 138 -34 28 42 5 28 11 35 29 39 15 27 15 50 - 87 0 0 28 11 48 4 17 45 30 139 -35 28 27 3 27 56 36 29 24 5 27 0 59 - 86 0 0 27 57 8 4 17 39 31 140 -35 28 12 22 27 41 59 29 9 16 26 46 28 - 85 0 0 27 42 51 4 17 32 31 140 -36 27 58 2 27 27 43 28 54 50 26 32 19 - 84 0 0 27 28 55 4 17 26 32 141 -36 27 44 5 27 13 50 28 40 46 26 18 32 - 83 0 0 27 15 22 4 17 20 33 142 -37 27 30 30 27 0 18 28 27 4 26 5 7 - 82 0 0 27 2 11 4 17 13 33 143 -37 27 17 17 26 47 9 28 13 44 25 52 4 - 81 0 0 26 49 23 4 17 6 34 144 -38 27 4 27 26 34 22 28 0 48 25 39 23 - 80 0 0 26 36 57 4 16 59 35 144 -38 26 52 0 26 21 59 27 48 14 25 27 5 - 79 0 0 26 24 55 4 16 52 35 145 -39 26 39 56 26 9 58 27 36 4 25 15 10 - 78 0 0 26 13 16 4 16 45 36 146 -39 26 28 15 25 58 20 27 24 17 25 3 38 - 77 0 0 26 2 0 4 16 38 37 147 -40 26 16 58 25 47 6 27 12 54 24 52 29 - 76 0 0 25 51 8 4 16 30 37 148 -40 26 6 4 25 36 15 27 1 55 24 41 44 - 75 0 0 25 40 39 4 16 23 38 149 -41 25 55 34 25 25 48 26 51 19 24 31 22 - 74 0 0 25 30 34 4 16 15 39 150 -41 25 45 28 25 15 45 26 41 8 24 21 23 - 73 0 0 25 20 54 4 16 8 39 151 -41 25 35 46 25 6 5 26 31 21 24 11 48 - 72 0 0 25 11 37 4 16 0 40 152 -41 25 26 28 24 56 50 26 21 58 24 2 38 - 71 0 0 25 2 45 4 15 52 40 153 -42 25 17 35 24 47 59 26 13 0 23 53 51 - 70 0 0 24 54 17 4 15 44 41 154 -42 25 9 6 24 39 32 26 4 27 23 45 29 - 69 0 0 24 46 14 4 15 36 41 155 -42 25 1 1 24 31 30 25 56 18 23 37 30 - 68 0 0 24 38 35 4 15 28 42 156 -42 24 53 22 24 23 52 25 48 34 23 29 56 - 67 0 0 24 31 21 4 15 20 42 157 -43 24 46 7 24 16 39 25 41 15 23 22 47 - 66 0 0 24 24 32 4 15 12 43 158 -43 24 39 16 24 9 51 25 34 22 23 16 2 - 65 0 0 24 18 8 4 15 4 43 159 -43 24 32 51 24 3 28 25 27 53 23 9 42 - 64 0 0 24 12 8 4 14 55 43 160 -43 24 26 51 23 57 29 25 21 50 23 3 46 - 63 0 0 24 6 34 4 14 47 44 162 -43 24 21 16 23 51 55 25 16 12 22 58 15 - 62 0 0 24 1 25 4 14 38 44 163 -43 24 16 6 23 46 47 25 10 59 22 53 9 - 61 0 0 23 56 41 4 14 30 45 164 -43 24 11 21 23 42 4 25 6 12 22 48 28 - 60 0 0 23 52 22 4 14 21 45 165 -43 24 7 2 23 37 45 25 1 50 22 44 12 - 59 0 0 23 48 28 4 14 13 45 166 -43 24 3 8 23 33 52 24 57 54 22 40 21 - 58 0 0 23 45 0 4 14 4 45 168 -43 23 59 39 23 30 24 24 54 23 22 36 55 - 57 0 0 23 41 57 4 13 56 46 169 -43 23 56 36 23 27 22 24 51 18 22 33 54 - 56 0 0 23 39 19 4 13 47 46 170 -43 23 53 58 23 24 45 24 48 39 22 31 18 - 55 0 0 23 37 7 4 13 38 46 171 -43 23 51 45 23 22 33 24 46 25 22 29 7 - 54 0 0 23 35 21 4 13 30 46 173 -43 23 49 58 23 20 47 24 44 37 22 27 22 - 53 0 0 23 33 59 4 13 21 46 174 -43 23 48 37 23 19 25 24 43 15 22 26 2 - 52 0 0 23 33 4 4 13 12 46 175 -42 23 47 41 23 18 30 24 42 19 22 25 6 - 51 0 0 23 32 33 4 13 3 46 177 -42 23 47 11 23 18 0 24 41 48 22 24 36 - 50 0 0 23 32 28 4 12 55 46 178 -42 23 47 6 23 17 55 24 41 43 22 24 32 - 49 0 0 23 32 49 4 12 46 46 179 -42 23 47 26 23 18 15 24 42 4 22 24 52 - 48 0 0 23 33 35 4 12 37 46 181 -41 23 48 13 23 19 1 24 42 50 22 25 38 - 47 0 0 23 34 47 4 12 28 46 182 -41 23 49 24 23 20 13 24 44 3 22 26 49 - 46 0 0 23 36 24 4 12 19 46 183 -41 23 51 2 23 21 50 24 45 41 22 28 25 - 45 0 0 23 38 26 4 12 11 46 184 -40 23 53 4 23 23 52 24 47 45 22 30 26 - 44 0 0 23 40 54 4 12 2 46 186 -40 23 55 33 23 26 19 24 50 14 22 32 52 - 43 0 0 23 43 47 4 11 53 46 187 -40 23 58 26 23 29 12 24 53 9 22 35 44 - 42 0 0 23 47 6 4 11 45 46 188 -39 24 1 45 23 32 30 24 56 30 22 39 0 - 41 0 0 23 50 50 4 11 36 46 190 -39 24 5 30 23 36 14 25 0 16 22 42 42 - 40 0 0 23 54 59 4 11 27 45 191 -38 24 9 39 23 40 22 25 4 28 22 46 48 - 39 0 0 23 59 33 4 11 19 45 192 -38 24 14 14 23 44 56 25 9 5 22 51 20 - 38 0 0 24 4 33 4 11 10 45 193 -37 24 19 14 23 49 55 25 14 8 22 56 16 - 37 0 0 24 9 57 4 11 1 45 195 -37 24 24 40 23 55 18 25 19 36 23 1 37 - 36 0 0 24 15 47 4 10 53 44 196 -36 24 30 30 24 1 7 25 25 30 23 7 23 - 35 0 0 24 22 1 4 10 45 44 197 -36 24 36 45 24 7 21 25 31 48 23 13 34 - 34 0 0 24 28 41 4 10 36 44 198 -35 24 43 25 24 13 59 25 38 32 23 20 9 - 33 0 0 24 35 45 4 10 28 43 199 -35 24 50 31 24 21 2 25 45 41 23 27 8 - 32 0 0 24 43 13 4 10 20 43 200 -34 24 58 0 24 28 30 25 53 15 23 34 33 - 31 0 0 24 51 7 4 10 11 42 202 -33 25 5 55 24 36 22 26 1 13 23 42 21 - 30 0 0 24 59 25 4 10 3 42 203 -33 25 14 14 24 44 39 26 9 37 23 50 34 - 29 0 0 25 8 7 4 9 55 41 204 -32 25 22 57 24 53 20 26 18 24 23 59 11 - 28 0 0 25 17 13 4 9 47 41 205 -31 25 32 5 25 2 26 26 27 37 24 8 12 - 27 0 0 25 26 44 4 9 39 40 206 -31 25 41 37 25 11 55 26 37 14 24 17 36 - 26 0 0 25 36 39 4 9 31 40 207 -30 25 51 33 25 21 48 26 47 15 24 27 25 - 25 0 0 25 46 57 4 9 24 39 208 -29 26 1 53 25 32 5 26 57 40 24 37 37 - 24 0 0 25 57 39 4 9 16 39 209 -29 26 12 36 25 42 46 27 8 29 24 48 13 - 23 0 0 26 8 45 4 9 8 38 210 -28 26 23 44 25 53 50 27 19 42 24 59 11 - 22 0 0 26 20 14 4 9 1 38 211 -27 26 35 14 26 5 18 27 31 19 25 10 34 - 21 0 0 26 32 6 4 8 54 37 212 -26 26 47 8 26 17 9 27 43 19 25 22 19 - 20 0 0 26 44 22 4 8 46 36 212 -26 26 59 25 26 29 22 27 55 42 25 34 27 - 19 0 0 26 57 0 4 8 39 36 213 -25 27 12 5 26 41 59 28 8 28 25 46 57 - 18 0 0 27 10 1 4 8 32 35 214 -24 27 25 7 26 54 58 28 21 37 25 59 50 - 17 0 0 27 23 24 4 8 25 34 215 -23 27 38 32 27 8 19 28 35 9 26 13 5 - 16 0 0 27 37 9 4 8 18 34 216 -23 27 52 19 27 22 3 28 49 3 26 26 42 - 15 0 0 27 51 16 4 8 12 33 217 -22 28 6 28 27 36 8 29 3 19 26 40 41 - 14 0 0 28 5 45 4 8 5 32 218 -21 28 20 59 27 50 35 29 17 57 26 55 2 - 13 0 0 28 20 36 4 7 59 31 218 -20 28 35 52 28 5 24 29 32 57 27 9 43 - 12 0 0 28 35 47 4 7 52 31 219 -19 28 51 5 28 20 33 29 48 18 27 24 46 - 11 0 0 28 51 20 4 7 46 30 220 -19 29 6 40 28 36 4 30 4 0 27 40 9 - 10 0 0 29 7 13 4 7 40 29 221 -18 29 22 35 28 51 55 30 20 3 27 55 53 - 9 0 0 29 23 26 4 7 34 29 221 -17 29 38 50 29 8 6 30 36 26 28 11 57 - 8 0 0 29 40 0 4 7 28 28 222 -16 29 55 26 29 24 38 30 53 10 28 28 21 - 7 0 0 29 56 53 4 7 23 27 223 -15 30 12 21 29 41 29 31 10 13 28 45 5 - 6 0 0 30 14 5 4 7 17 26 223 -15 30 29 35 29 58 39 31 27 36 29 2 8 - 5 0 0 30 31 37 4 7 12 25 224 -14 30 47 9 30 16 8 31 45 17 29 19 29 - 4 0 0 30 49 26 4 7 7 25 225 -13 31 5 1 30 33 56 32 3 18 29 37 9 - 3 0 0 31 7 35 4 7 2 24 225 -12 31 23 12 30 52 2 32 21 37 29 55 8 - 2 0 0 31 26 1 4 6 57 23 226 -11 31 41 40 31 10 26 32 40 13 30 13 24 - 1 0 0 31 44 44 4 6 52 22 227 -10 32 0 25 31 29 7 32 59 7 30 31 57 0 0 0 32 3 45 4 6 48 21 227 -9 32 19 28 31 48 5 33 18 19 30 50 47 1 0 0 32 23 2 4 6 43 20 228 -9 32 38 47 32 7 20 33 37 46 31 9 54 2 0 0 32 42 35 4 6 39 20 229 -8 32 58 23 32 26 51 33 57 30 31 29 17 3 0 0 33 2 23 4 6 35 19 229 -7 33 18 14 32 46 38 34 17 30 31 48 56 4 0 0 33 22 27 4 6 31 18 230 -6 33 38 20 33 6 39 34 37 45 32 8 49 5 0 0 33 42 46 4 6 28 17 231 -5 33 58 41 33 26 56 34 58 14 32 28 58 6 0 0 34 3 19 4 6 24 16 231 -4 34 19 16 33 47 26 35 18 58 32 49 20 7 0 0 34 24 5 4 6 21 15 232 -3 34 40 5 34 8 11 35 39 55 33 9 57 8 0 0 34 45 5 4 6 18 15 232 -2 35 1 6 34 29 8 36 1 6 33 30 46 9 0 0 35 6 17 4 6 15 14 233 -1 35 22 21 34 50 18 36 22 29 33 51 49 10 0 0 35 27 41 4 6 12 13 234 -1 35 43 47 35 11 40 36 44 3 34 13 3 Uncertainty in time = +/- 9 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 23940468 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 05 15.8871 DE: -20 03 36.608 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .040, .041 ) * V mag [mag]: 11.4 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (962) Aslog approx. diameter [km]: 39 approx. diameter ["]: .028 distance from Earth [AU]: 1.95200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1021 number of rejected observations: 32 time covered by the observations: 1921 Oct 25 - 2008 Jan 30 1 sigma uncertainty ellipse (major, minor, PA): 0.055, 0.031, 91° remarks: * orbital elements for (962) Aslog : Mean anomaly = 267.68312694 deg Arg. of pericenter = 224.70922228 deg Long. of node = 145.66384280 deg Inclination = 2.60268519 deg Eccentricity = 0.10231918 Semimajor axis = 2.90388464 AU Perihelion dist = 2.60676155 AU Mag: H = 11.28, G = 0.15 Epoch of elements : MJD 54990.17500000 TDT (2009 Jun 08.175) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 8 962 Aslog 4h 12.7m UT 11.4 18 5 15.887-20 3 36.61UCAC2 23940468 0.0 15.7 39 3.5 1.952 -2.023 -0.32 -48.5555 -20.059 116.57 22.85 4.2124 -0.00741 0.68757 -6.32435 -0.07014 -0.00134 -0.00033 2000 267.6482712009 6 8.00000224.709222145.663843 2.6026850.10231918 2.9038846 2.606761511.5 5.00.15 RATE 1.9917510 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.068 0.052 91 2.85 0.051 0 54545.5020090608_940468 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 09:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org