IOTA/IOTA-ES occultation update for (164) Eva / UCAC2 20766410 event on 2009 Nov 08, 09:42 UT Visible from Summary ------- On 2009 Nov 08 UT, the 105 km diameter asteroid (164) Eva will occult a 11.9 mag star in the constellation Fornax for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.4 mag to 11.1 mag (the magnitude of the asteroid) for at most 8.1 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: 91 * date and approx. time of event: 2009 Nov 08, 09:37 - 2009 Nov 08, 09:50 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 0.4 * estimated maximum duration [s]: 8.1 * Moon: 64 % sunlit, 102° distance * Sun: 134° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 109 * 1 sigma uncertainty interval [path widths]: +/- 0.50 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .070 +/- .047) * 1 sigma uncertainty ellipse (major, minor, PA): ( .077", .033", 62° ) * approx speed of asteroid's shadow [km/s]: 12.9512 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 20766410 by 164 Eva on 2009 Nov 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 ' " Longitude Longitude Longitude Longitude 128 42 44 40 0 0 9 50 41 1 127 -18 129 45 39 127 38 24 130 47 17 ... .. .. 130 23 34 39 0 0 9 50 41 3 128 -20 131 23 36 129 22 20 132 22 30 128 19 49 131 58 0 38 0 0 9 50 40 4 129 -21 132 55 30 130 59 27 133 52 2 129 59 47 133 26 50 37 0 0 9 50 39 6 129 -22 134 22 7 132 30 37 135 16 33 131 33 26 134 50 43 36 0 0 9 50 37 7 130 -23 135 44 3 133 56 34 136 36 37 133 1 35 136 10 13 35 0 0 9 50 36 9 131 -24 137 1 48 135 17 54 137 52 42 134 24 51 137 25 46 34 0 0 9 50 34 10 132 -25 138 15 47 136 35 7 139 5 11 135 43 47 138 37 47 33 0 0 9 50 31 11 132 -26 139 26 22 137 48 37 140 14 25 136 58 50 139 46 35 32 0 0 9 50 29 13 133 -27 140 33 53 138 58 46 141 20 41 138 10 23 140 52 28 31 0 0 9 50 26 14 134 -28 141 38 35 140 5 52 142 24 15 139 18 45 141 55 40 30 0 0 9 50 23 16 134 -28 142 40 43 141 10 11 143 25 20 140 24 14 142 56 25 29 0 0 9 50 20 17 134 -29 143 40 28 142 11 58 144 24 8 141 27 5 143 54 55 28 0 0 9 50 16 18 135 -30 144 38 4 143 11 24 145 20 50 142 27 30 144 51 20 27 0 0 9 50 12 19 135 -31 145 33 38 144 8 41 146 15 36 143 25 41 145 45 49 26 0 0 9 50 9 21 136 -31 146 27 20 145 3 59 147 8 33 144 21 48 146 38 31 25 0 0 9 50 4 22 136 -32 147 19 19 145 57 25 147 59 49 145 16 1 147 29 33 24 0 0 9 50 0 23 136 -33 148 9 41 146 49 9 148 49 32 146 8 27 148 19 2 23 0 0 9 49 56 24 136 -33 148 58 32 147 39 17 149 37 47 146 59 14 149 7 5 22 0 0 9 49 51 26 137 -34 149 46 0 148 27 55 150 24 41 147 48 29 149 53 46 21 0 0 9 49 46 27 137 -35 150 32 9 149 15 9 151 10 18 148 36 18 150 39 11 20 0 0 9 49 41 28 137 -35 151 17 4 150 1 6 151 54 44 149 22 46 151 23 26 19 0 0 9 49 36 29 137 -36 152 0 50 150 45 49 152 38 2 150 7 59 152 6 33 18 0 0 9 49 31 30 137 -36 152 43 31 151 29 23 153 20 18 150 52 1 152 48 37 17 0 0 9 49 26 32 137 -37 153 25 11 152 11 53 154 1 34 151 34 56 153 29 43 16 0 0 9 49 20 33 137 -37 154 5 53 152 53 21 154 41 54 152 16 49 154 9 52 15 0 0 9 49 14 34 137 -38 154 45 42 153 33 53 155 21 21 152 57 43 154 49 10 14 0 0 9 49 8 35 138 -38 155 24 39 154 13 30 155 59 59 153 37 41 155 27 37 13 0 0 9 49 2 36 137 -39 156 2 49 154 52 17 156 37 51 154 16 47 156 5 19 12 0 0 9 48 56 37 137 -39 156 40 13 155 30 16 157 14 58 154 55 4 156 42 16 11 0 0 9 48 50 38 137 -39 157 16 54 156 7 29 157 51 24 155 32 34 157 18 31 10 0 0 9 48 43 40 137 -40 157 52 54 156 44 0 158 27 10 156 9 20 157 54 7 9 0 0 9 48 37 41 137 -40 158 28 17 157 19 50 159 2 19 156 45 24 158 29 6 8 0 0 9 48 30 42 137 -40 159 3 3 157 55 2 159 36 54 157 20 49 159 3 30 7 0 0 9 48 23 43 137 -40 159 37 16 158 29 37 160 10 55 157 55 37 159 37 20 6 0 0 9 48 16 44 137 -41 160 10 56 159 3 38 160 44 25 158 29 49 160 10 40 5 0 0 9 48 9 45 136 -41 160 44 5 159 37 7 161 17 25 159 3 28 160 43 29 4 0 0 9 48 2 46 136 -41 161 16 46 160 10 6 161 49 58 159 36 35 161 15 50 3 0 0 9 47 55 47 136 -41 161 49 0 160 42 35 162 22 4 160 9 13 161 47 45 2 0 0 9 47 48 48 135 -41 162 20 48 161 14 37 162 53 45 160 41 22 162 19 15 1 0 0 9 47 40 49 135 -41 162 52 12 161 46 13 163 25 4 161 13 4 162 50 21 0 0 0 9 47 33 50 135 -42 163 23 13 162 17 24 163 56 0 161 44 21 163 21 5 - 1 0 0 9 47 25 51 134 -42 163 53 53 162 48 13 164 26 36 162 15 14 Latitude Latitude Latitude Latitude 164 0 0 - 2 16 58 9 47 15 53 133 -42 - 1 12 3 - 3 22 35 - 0 7 49 - 4 28 58 165 0 0 - 4 17 43 9 46 59 55 132 -42 - 3 11 38 - 5 24 34 - 2 6 15 - 6 32 14 166 0 0 - 6 20 52 9 46 43 57 131 -41 - 5 13 35 - 7 28 56 - 4 7 5 - 8 37 54 167 0 0 - 8 26 11 9 46 26 59 129 -41 - 7 17 44 - 9 35 30 - 6 10 6 -10 45 45 168 0 0 -10 33 29 9 46 8 61 127 -41 - 9 23 52 -11 44 1 - 8 15 6 -12 55 33 169 0 0 -12 42 29 9 45 50 63 125 -40 -11 31 42 -13 54 14 -10 21 50 -15 7 3 170 0 0 -14 52 55 9 45 31 65 122 -40 -13 41 0 -16 5 52 -12 30 4 -17 19 57 171 0 0 -17 4 29 9 45 12 67 118 -39 -15 51 28 -18 18 36 -14 39 28 -19 33 56 172 0 0 -19 16 50 9 44 52 68 114 -38 -18 2 45 -20 32 6 -16 49 44 -21 48 39 173 0 0 -21 29 38 9 44 33 70 109 -38 -20 14 32 -22 46 0 -19 0 33 -24 3 42 174 0 0 -23 42 31 9 44 13 71 104 -37 -22 26 26 -24 59 54 -21 11 32 -26 18 44 175 0 0 -25 55 4 9 43 53 73 97 -36 -24 38 4 -27 13 26 -23 22 20 -28 33 18 176 0 0 -28 6 54 9 43 33 73 89 -34 -26 49 4 -29 26 9 -25 32 34 -30 46 58 177 0 0 -30 17 36 9 43 13 74 81 -33 -28 59 2 -31 37 39 -27 41 51 -32 59 20 178 0 0 -32 26 46 9 42 53 74 73 -32 -31 7 34 -33 47 30 -29 49 47 -35 9 57 179 0 0 -34 33 59 9 42 34 74 64 -31 -33 14 16 -35 55 19 -31 55 59 -37 18 24 180 0 0 -36 38 54 9 42 15 74 56 -30 -35 18 46 -38 0 41 -34 0 7 -39 24 15 -179 0 0 -38 41 8 9 41 57 73 48 -28 -37 20 43 -40 3 13 -36 1 49 -41 27 8 -178 0 0 -40 40 20 9 41 39 72 41 -27 -39 19 46 -42 2 35 -38 0 45 -43 26 42 -177 0 0 -42 36 12 9 41 21 71 35 -26 -41 15 38 -43 58 28 -39 56 37 -45 22 37 -176 0 0 -44 28 29 9 41 5 70 30 -24 -43 8 3 -45 50 37 -41 49 11 -47 14 37 -175 0 0 -46 16 57 9 40 49 69 26 -23 -44 56 48 -47 38 47 -43 38 12 -49 2 28 -174 0 0 -48 1 24 9 40 33 67 22 -22 -46 41 41 -49 22 48 -45 23 29 -50 46 1 -173 0 0 -49 41 44 9 40 19 66 18 -20 -48 22 35 -51 2 32 -47 4 55 -52 25 8 -172 0 0 -51 17 51 9 40 5 65 15 -19 -49 59 23 -52 37 56 -48 42 22 -53 59 45 -171 0 0 -52 49 43 9 39 52 63 13 -18 -51 32 2 -54 8 56 -50 15 48 -55 29 51 -170 0 0 -54 17 18 9 39 39 62 10 -17 -53 0 33 -55 35 34 -51 45 10 -56 55 27 -169 0 0 -55 40 41 9 39 28 61 8 -16 -54 24 56 -56 57 52 -53 10 30 -58 16 37 -168 0 0 -56 59 53 9 39 17 59 6 -15 -55 45 14 -58 15 56 -54 31 50 -59 33 28 -167 0 0 -58 15 3 9 39 6 58 4 -14 -57 1 33 -59 29 52 -55 49 15 -60 46 6 -166 0 0 -59 26 16 9 38 57 57 3 -13 -58 13 59 -60 39 48 -57 2 50 -61 54 40 -165 0 0 -60 33 41 9 38 47 56 1 -12 -59 22 39 -61 45 53 -58 12 43 -62 59 22 -164 0 0 -61 37 26 9 38 39 55 359 -11 -60 27 42 -62 48 17 -59 19 0 -64 0 20 -163 0 0 -62 37 43 9 38 31 54 358 -10 -61 29 17 -63 47 11 -60 21 50 -64 57 47 -162 0 0 -63 34 40 9 38 23 53 357 -9 -62 27 34 -64 42 45 -61 21 23 -65 51 54 -161 0 0 -64 28 27 9 38 16 52 355 -8 -63 22 41 -65 35 9 -62 17 46 -66 42 51 -160 0 0 -65 19 15 9 38 10 51 354 -8 -64 14 48 -66 24 35 -63 11 9 -67 30 50 -159 0 0 -66 7 14 9 38 4 50 353 -7 -65 4 5 -67 11 12 -64 1 42 -68 16 1 -158 0 0 -66 52 33 9 37 58 49 351 -6 -65 50 42 -67 55 10 -64 49 34 -68 58 35 -157 0 0 -67 35 22 9 37 52 49 350 -6 -66 34 47 -68 36 39 -65 34 52 -69 38 42 -156 0 0 -68 15 49 9 37 47 48 349 -5 -67 16 28 -69 15 49 -66 17 46 -70 16 31 -155 0 0 -68 54 3 9 37 42 47 348 -4 -67 55 56 -69 52 47 -66 58 24 -70 52 11 -154 0 0 -69 30 12 9 37 38 47 347 -4 -68 33 16 -70 27 43 -67 36 53 -71 25 51 -153 0 0 -70 4 24 9 37 34 46 346 -3 -69 8 38 -71 0 44 -68 13 22 -71 57 38 -152 0 0 -70 36 47 9 37 29 45 344 -3 -69 42 7 -71 31 57 -68 47 57 -72 27 39 -151 0 0 -71 7 26 9 37 26 45 343 -2 -70 13 52 -72 1 29 -69 20 45 -72 56 2 -150 0 0 -71 36 28 9 37 22 44 342 -2 -70 43 58 -72 29 26 -69 51 52 -73 22 53 -149 0 0 -72 4 0 9 37 19 44 341 -1 -71 12 30 -72 55 55 -70 21 25 -73 48 17 -148 0 0 -72 30 7 9 37 15 43 340 -1 -71 39 36 -73 21 1 -70 49 28 -74 12 21 -147 0 0 -72 54 53 9 37 12 43 339 -1 -72 5 20 -73 44 50 -71 16 7 -74 35 9 -146 0 0 -73 18 25 9 37 9 42 338 0 -72 29 46 -74 7 25 -71 41 28 -74 56 47 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 20766410 * constellation : Fornax * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 51 27.4142 DE: -26 37 35.023 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .026 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (164) Eva approx. diameter [km]: 105 approx. diameter ["]: .154 distance from Earth [AU]: 0.94200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 673 number of rejected observations: 49 time covered by the observations: 1900 Mar 06 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.071, 0.021, 56° remarks: * orbital elements for (164) Eva : Mean anomaly = 13.55603503 deg Arg. of pericenter = 283.42129561 deg Long. of node = 77.13630475 deg Inclination = 24.47146582 deg Eccentricity = 0.34543949 Semimajor axis = 2.63243365 AU Perihelion dist = 1.72308711 AU Mag: H = 8.81, G = 0.15 Epoch of elements : MJD 55143.40500000 TDT (2009 Nov 08.405) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 8 164 Eva 9h 42.8m UT 11.9 1 51 27.414-26 37 35.02UCAC2 20766410 0.0 11.1 105 8.1 0.942 -2.398 60.17 -165.5477 -26.643 30.25 -16.66 9.7131 -0.23457 -0.12609 -3.44869 6.44540 0.00128 0.00339 2000 12.770284200911 5.00000283.421296 77.136305 24.4714660.34543949 2.6324337 1.7230871 8.9 5.00.15 RATE 2.3076390 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.077 0.033 62 1.50 0.077 0 54545.5020091108_766410 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 16:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org