IOTA/IOTA-ES occultation update for (489) Comacina / 2UCAC 28827215 event on 2008 Aug 22, 13:15 UT Visible from Japan, Taiwan, SE Asia Summary ------- On 2008 Aug 22 UT, the 139 km diameter asteroid (489) Comacina will occult a 13.0 mag star in the constellation Capricornus for observers along a path across Japan, Taiwan, SE Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 13.2 mag (the magnitude of the asteroid) for at most 11.4 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: 71 * date and approx. time of event: 2008 Aug 22, 13:08 - 2008 Aug 22, 13:21 UT * midpoint of event [JD]: 2454701.05250417 * magnitude of target star: 13.0 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 11.4 * Moon: 66 % sunlit, 92° distance * Sun: 156° distance * rough path description: Japan, Taiwan, SE Asia The occultation path -------------------- * approximate projected width [km]: 168 * 1 sigma uncertainty interval [path widths]: +/- 0.81 * 1 sigma uncertainty interval [seconds]: +/- 9.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .070 +/- .067) * 1 sigma uncertainty ellipse (major, minor, PA): ( .070", .067", 90° ) * approx speed of asteroid's shadow [km/s]: 12.2324 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 28827215 by 489 Comacina on 2008 Aug 22 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 ' " Longitude Longitude Longitude Longitude -158 18 31 69 0 0 13 8 27 2 241 -5 -162 35 36 -153 35 49 -168 54 45 ... .. .. -163 4 44 68 0 0 13 8 28 4 236 -7 -166 51 27 -159 1 40 -172 33 11 ... .. .. Latitude Latitude Latitude Latitude -165 0 0 67 32 54 13 8 29 5 235 -8 68 27 13 66 39 16 69 56 44 65 13 43 -166 0 0 67 18 5 13 8 29 5 234 -8 68 12 47 66 24 4 69 42 57 64 57 57 -167 0 0 67 2 45 13 8 30 5 233 -9 67 57 51 66 8 23 69 28 41 64 41 41 -168 0 0 66 46 55 13 8 30 6 232 -9 67 42 24 65 52 10 69 13 55 64 24 53 -169 0 0 66 30 33 13 8 31 6 231 -9 67 26 26 65 35 25 68 58 38 64 7 32 -170 0 0 66 13 39 13 8 32 7 230 -10 67 9 56 65 18 7 68 42 50 63 49 38 -171 0 0 65 56 11 13 8 32 7 229 -10 66 52 53 65 0 15 68 26 29 63 31 10 -172 0 0 65 38 9 13 8 33 8 228 -11 66 35 16 64 41 49 68 9 35 63 12 7 -173 0 0 65 19 32 13 8 34 8 227 -11 66 17 4 64 22 48 67 52 7 62 52 29 -174 0 0 65 0 19 13 8 35 9 226 -12 65 58 17 64 3 10 67 34 4 62 32 14 -175 0 0 64 40 29 13 8 36 9 225 -12 65 38 53 63 42 56 67 15 25 62 11 22 -176 0 0 64 20 2 13 8 37 10 224 -13 65 18 52 63 22 5 66 56 8 61 49 53 -177 0 0 63 58 57 13 8 38 11 224 -13 64 58 12 63 0 34 66 36 14 61 27 44 -178 0 0 63 37 12 13 8 39 11 223 -14 64 36 54 62 38 25 66 15 40 61 4 57 -179 0 0 63 14 48 13 8 40 12 222 -14 64 14 55 62 15 35 65 54 27 60 41 29 -180 0 0 62 51 42 13 8 41 12 221 -15 63 52 16 61 52 5 65 32 33 60 17 21 179 0 0 62 27 55 13 8 43 13 220 -15 63 28 55 61 27 53 65 9 57 59 52 31 178 0 0 62 3 25 13 8 44 14 219 -16 63 4 51 61 2 58 64 46 39 59 26 59 177 0 0 61 38 12 13 8 46 14 218 -16 62 40 4 60 37 20 64 22 36 59 0 44 176 0 0 61 12 15 13 8 48 15 217 -17 62 14 32 60 10 59 63 57 49 58 33 45 175 0 0 60 45 33 13 8 50 15 216 -17 61 48 15 59 43 53 63 32 17 58 6 3 174 0 0 60 18 5 13 8 52 16 215 -18 61 21 13 59 16 2 63 5 58 57 37 36 173 0 0 59 49 51 13 8 54 17 215 -18 60 53 24 58 47 25 62 38 51 57 8 24 172 0 0 59 20 51 13 8 56 17 214 -19 60 24 47 58 18 2 62 10 57 56 38 26 171 0 0 58 51 4 13 8 59 18 213 -19 59 55 23 57 47 52 61 42 14 56 7 43 170 0 0 58 20 28 13 9 1 19 212 -20 59 25 11 57 16 55 61 12 42 55 36 14 169 0 0 57 49 5 13 9 4 20 211 -21 58 54 9 56 45 11 60 42 20 55 3 58 168 0 0 57 16 53 13 9 7 20 210 -21 58 22 19 56 12 39 60 11 7 54 30 55 167 0 0 56 43 52 13 9 10 21 209 -22 57 49 39 55 39 19 59 39 3 53 57 6 166 0 0 56 10 3 13 9 13 22 208 -22 57 16 9 55 5 11 59 6 8 53 22 30 165 0 0 55 35 24 13 9 16 23 207 -23 56 41 49 54 30 14 58 32 21 52 47 8 164 0 0 54 59 56 13 9 20 23 206 -24 56 6 39 53 54 30 57 57 42 52 10 59 163 0 0 54 23 40 13 9 23 24 205 -24 55 30 39 53 17 59 57 22 11 51 34 4 162 0 0 53 46 35 13 9 27 25 205 -25 54 53 50 52 40 40 56 45 49 50 56 23 161 0 0 53 8 42 13 9 31 26 204 -25 54 16 11 52 2 34 56 8 35 50 17 58 160 0 0 52 30 2 13 9 35 27 203 -26 53 37 43 51 23 41 55 30 30 49 38 47 159 0 0 51 50 34 13 9 40 27 202 -27 52 58 27 50 44 3 54 51 34 48 58 53 158 0 0 51 10 20 13 9 44 28 201 -27 52 18 23 50 3 39 54 11 47 48 18 16 157 0 0 50 29 21 13 9 49 29 200 -28 51 37 32 49 22 32 53 31 12 47 36 57 156 0 0 49 47 37 13 9 54 30 199 -28 50 55 55 48 40 42 52 49 48 46 54 57 155 0 0 49 5 10 13 10 0 31 198 -29 50 13 34 47 58 10 52 7 36 46 12 17 154 0 0 48 22 1 13 10 5 32 197 -30 49 30 29 47 14 57 51 24 38 45 28 59 153 0 0 47 38 11 13 10 11 33 196 -30 48 46 41 46 31 5 50 40 56 44 45 3 152 0 0 46 53 43 13 10 17 34 195 -31 48 2 14 45 46 35 49 56 29 44 0 33 151 0 0 46 8 36 13 10 23 34 194 -31 47 17 7 45 1 30 49 11 22 43 15 28 150 0 0 45 22 54 13 10 30 35 193 -32 46 31 23 44 15 50 48 25 34 42 29 51 149 0 0 44 36 39 13 10 36 36 192 -33 45 45 3 43 29 38 47 39 8 41 43 44 148 0 0 43 49 51 13 10 43 37 191 -33 44 58 10 42 42 55 46 52 6 40 57 9 147 0 0 43 2 33 13 10 50 38 190 -34 44 10 46 41 55 44 46 4 30 40 10 7 146 0 0 42 14 48 13 10 57 39 189 -34 43 22 53 41 8 6 45 16 23 39 22 41 145 0 0 41 26 38 13 11 5 40 187 -35 42 34 33 40 20 4 44 27 46 38 34 53 144 0 0 40 38 4 13 11 13 41 186 -35 41 45 48 39 31 41 43 38 42 37 46 45 143 0 0 39 49 9 13 11 21 42 185 -36 40 56 41 38 42 58 42 49 14 36 58 19 142 0 0 38 59 56 13 11 29 42 184 -36 40 7 15 37 53 57 41 59 24 36 9 37 141 0 0 38 10 27 13 11 37 43 183 -36 39 17 31 37 4 42 41 9 15 35 20 42 140 0 0 37 20 45 13 11 46 44 181 -37 38 27 33 36 15 14 40 18 49 34 31 37 139 0 0 36 30 51 13 11 55 45 180 -37 37 37 23 35 25 36 39 28 9 33 42 23 138 0 0 35 40 49 13 12 3 46 179 -37 36 47 3 34 35 50 38 37 18 32 53 2 137 0 0 34 50 40 13 12 13 47 177 -38 35 56 36 33 46 0 37 46 18 32 3 38 136 0 0 34 0 28 13 12 22 47 176 -38 35 6 4 32 56 6 36 55 12 31 14 12 135 0 0 33 10 15 13 12 31 48 174 -38 34 15 31 32 6 12 36 4 3 30 24 47 134 0 0 32 20 3 13 12 41 49 173 -38 33 24 58 31 16 20 35 12 54 29 35 24 133 0 0 31 29 55 13 12 51 50 171 -39 32 34 28 30 26 32 34 21 46 28 46 7 132 0 0 30 39 53 13 13 0 50 169 -39 31 44 4 29 36 51 33 30 42 27 56 58 131 0 0 29 49 59 13 13 10 51 168 -39 30 53 47 28 47 18 32 39 46 27 7 58 130 0 0 29 0 16 13 13 21 52 166 -39 30 3 41 27 57 57 31 48 59 26 19 9 129 0 0 28 10 45 13 13 31 52 164 -39 29 13 46 27 8 48 30 58 23 25 30 34 128 0 0 27 21 29 13 13 41 53 163 -39 28 24 7 26 19 55 30 8 2 24 42 15 127 0 0 26 32 30 13 13 51 53 161 -39 27 34 44 25 31 19 29 17 57 23 54 14 126 0 0 25 43 50 13 14 2 54 159 -39 26 45 39 24 43 2 28 28 10 23 6 32 125 0 0 24 55 30 13 14 12 54 157 -39 25 56 55 23 55 6 27 38 43 22 19 11 124 0 0 24 7 34 13 14 23 54 155 -39 25 8 34 23 7 32 26 49 39 21 32 13 123 0 0 23 20 1 13 14 33 55 153 -38 24 20 37 22 20 23 26 0 59 20 45 39 122 0 0 22 32 55 13 14 44 55 151 -38 23 33 6 21 33 40 25 12 45 19 59 32 121 0 0 21 46 16 13 14 55 55 149 -38 22 46 2 20 47 25 24 24 59 19 13 53 120 0 0 21 0 7 13 15 5 55 147 -38 21 59 28 20 1 39 23 37 42 18 28 42 119 0 0 20 14 28 13 15 16 56 145 -37 21 13 25 19 16 23 22 50 57 17 44 2 118 0 0 19 29 20 13 15 27 56 143 -37 20 27 53 18 31 39 22 4 43 16 59 54 117 0 0 18 44 47 13 15 37 56 141 -37 19 42 55 17 47 28 21 19 3 16 16 18 116 0 0 18 0 47 13 15 48 56 139 -36 18 58 32 17 3 52 20 33 59 15 33 17 115 0 0 17 17 24 13 15 58 56 137 -36 18 14 45 16 20 51 19 49 30 14 50 51 114 0 0 16 34 36 13 16 9 55 135 -35 17 31 34 15 38 26 19 5 39 14 9 0 113 0 0 15 52 27 13 16 19 55 133 -35 16 49 1 14 56 39 18 22 26 13 27 47 112 0 0 15 10 56 13 16 30 55 131 -34 16 7 7 14 15 30 17 39 53 12 47 12 111 0 0 14 30 5 13 16 40 55 129 -34 15 25 53 13 35 0 16 58 0 12 7 16 110 0 0 13 49 53 13 16 50 54 127 -33 14 45 20 12 55 11 16 16 48 11 27 59 109 0 0 13 10 23 13 17 0 54 126 -32 14 5 27 12 16 1 15 36 18 10 49 22 108 0 0 12 31 34 13 17 11 54 124 -32 13 26 17 11 37 34 14 56 30 10 11 26 107 0 0 11 53 28 13 17 21 53 122 -31 12 47 49 10 59 48 14 17 26 9 34 12 106 0 0 11 16 4 13 17 30 53 121 -31 12 10 5 10 22 44 13 39 6 8 57 39 105 0 0 10 39 24 13 17 40 52 119 -30 11 33 4 9 46 24 13 1 30 8 21 49 104 0 0 10 3 28 13 17 50 52 118 -29 10 56 48 9 10 47 12 24 39 7 46 42 103 0 0 9 28 16 13 18 0 51 117 -28 10 21 16 8 35 53 11 48 34 7 12 18 102 0 0 8 53 48 13 18 9 51 115 -28 9 46 29 8 1 44 11 13 14 6 38 38 101 0 0 8 20 5 13 18 18 50 114 -27 9 12 27 7 28 20 10 38 40 6 5 42 100 0 0 7 47 8 13 18 28 49 113 -26 8 39 11 6 55 40 10 4 53 5 33 30 99 0 0 7 14 56 13 18 37 49 112 -26 8 6 41 6 23 45 9 31 52 5 2 2 98 0 0 6 43 29 13 18 46 48 111 -25 7 34 57 5 52 36 8 59 38 4 31 19 97 0 0 6 12 49 13 18 54 47 110 -24 7 4 0 5 22 12 8 28 11 4 1 21 96 0 0 5 42 54 13 19 3 46 109 -23 6 33 48 4 52 34 7 57 32 3 32 8 95 0 0 5 13 46 13 19 12 46 108 -22 6 4 24 4 23 41 7 27 39 3 3 40 94 0 0 4 45 24 13 19 20 45 107 -22 5 35 46 3 55 35 6 58 35 2 35 57 93 0 0 4 17 49 13 19 28 44 106 -21 5 7 55 3 28 14 6 30 18 2 8 59 92 0 0 3 50 59 13 19 36 43 106 -20 4 40 51 3 1 39 6 2 48 1 42 47 91 0 0 3 24 57 13 19 44 43 105 -19 4 14 34 2 35 51 5 36 6 1 17 20 90 0 0 2 59 41 13 19 52 42 104 -18 3 49 3 2 10 48 5 10 12 0 52 39 89 0 0 2 35 11 13 20 0 41 104 -17 3 24 20 1 46 32 4 45 6 0 28 43 88 0 0 2 11 28 13 20 7 40 103 -17 3 0 24 1 23 2 4 20 47 0 5 33 87 0 0 1 48 31 13 20 14 39 103 -16 2 37 14 1 0 17 3 57 17 - 0 16 52 86 0 0 1 26 21 13 20 22 38 102 -15 2 14 52 0 38 19 3 34 33 - 0 38 32 85 0 0 1 4 57 13 20 29 37 102 -14 1 53 17 0 17 7 3 12 38 - 0 59 26 84 0 0 0 44 20 13 20 35 37 101 -13 1 32 28 - 0 3 19 2 51 30 - 1 19 35 83 0 0 0 24 29 13 20 42 36 101 -12 1 12 26 - 0 23 0 2 31 10 - 1 38 59 82 0 0 0 5 24 13 20 48 35 101 -11 0 53 11 - 0 41 54 2 11 37 - 1 57 37 81 0 0 - 0 12 54 13 20 55 34 100 -10 0 34 42 - 1 0 3 1 52 51 - 2 15 31 80 0 0 - 0 30 26 13 21 1 33 100 -9 0 17 1 - 1 17 26 1 34 53 - 2 32 39 79 0 0 - 0 47 12 13 21 7 32 100 -9 0 0 5 - 1 34 3 1 17 43 - 2 49 2 78 0 0 - 1 3 12 13 21 13 31 99 -8 - 0 16 4 - 1 49 55 1 1 19 - 3 4 41 77 0 0 - 1 18 26 13 21 18 30 99 -7 - 0 31 26 - 2 5 1 0 45 43 - 3 19 34 76 0 0 - 1 32 55 13 21 24 29 99 -6 - 0 46 2 - 2 19 21 0 30 54 - 3 33 43 75 0 0 - 1 46 37 13 21 29 28 99 -5 - 0 59 51 - 2 32 56 0 16 52 - 3 47 7 74 0 0 - 1 59 33 13 21 34 27 99 -4 - 1 12 55 - 2 45 46 0 3 37 - 3 59 46 73 0 0 - 2 11 44 13 21 39 26 99 -3 - 1 25 12 - 2 57 50 - 0 8 51 - 4 11 40 72 0 0 - 2 23 9 13 21 44 25 98 -2 - 1 36 43 - 3 9 9 - 0 20 32 - 4 22 50 71 0 0 - 2 33 48 13 21 49 25 98 -1 - 1 47 28 - 3 19 43 - 0 31 26 - 4 33 15 70 0 0 - 2 43 42 13 21 53 24 98 0 - 1 57 26 - 3 29 32 - 0 41 34 - 4 42 56 Uncertainty in time = +/- 10 secs [Prediction of 2008 Jul 25.0] Data for the target star ------------------------ * name: 2UCAC 28827215 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 32 23.1474 DE: -08 36 43.729 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .067, .066 ) * V mag [mag]: 13.0 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 308.2212995410 DE(deg): -8.5814985106 * Equation of equinoxes (radians) : 0.000053504899148 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (489) Comacina approx. diameter [km]: 139 approx. diameter ["]: .084 distance from Earth [AU]: 2.29100 * orbital information: orbit source: Preston date of fit: 2008 Jul 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 785 number of rejected observations: 90 time covered by the observations: 1911 Mar 01 - 2008 Jul 17 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.014, 85° remarks: * orbital elements for (489) Comacina : Mean anomaly = 130.68280736 deg Arg. of pericenter = 13.08326587 deg Long. of node = 166.93296443 deg Inclination = 12.98713169 deg Eccentricity = 0.04146503 Semimajor axis = 3.15532060 AU Perihelion dist = 3.02448515 AU Mag: H = 8.40, G = 0.15 Epoch of elements : MJD 54700.55200000 TDT (2008 Aug 22.552) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Aug 22 489 Comacina 13h 15.6m UT 13.0 20 32 23.147- 8 36 43.732UCAC 28827215 0.0 13.2 139 11.4 2.291 -1.425 -15.98 137.9758 -8.607 -18.21 11.54 13.2601 -0.33970 0.44860 -5.50702 -4.16443 0.00222 -0.00038 2000 130.5857392008 822.00000 13.083266166.932964 12.9871320.04146503 3.1553206 3.0244851 8.3 5.00.15 RATE 1.7584850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.070 0.067 90 1.81 0.068 0 54672.5020080822_827215 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 25, 04:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org