IOTA/IOTA-ES occultation update for (61) Danae / TYC 6109-00545-1 event on 2008 Mar 28, 12:59 UT Visible from Japan, China Summary ------- On 2008 Mar 28 UT, the 77 km diameter asteroid (61) Danae will occult a 12.1 mag star in the constellation Corvus for observers along a path across Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 12.7 mag (the magnitude of the asteroid) for at most 4.9 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: 82 * date and approx. time of event: 2008 Mar 28, 12:55 - 2008 Mar 28, 13:03 UT * midpoint of event [JD]: 2454554.0413375 * magnitude of target star: 12.1 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 4.9 * Moon: 64 % sunlit, 67° distance * Sun: 162° distance * rough path description: Japan, China The occultation path -------------------- * approximate projected width [km]: 119 * 1 sigma uncertainty interval [path widths]: +/- 0.65 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .028", 100° ) * approx speed of asteroid's shadow [km/s]: 15.8040 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6109-00545-1 by 61 Danae on 2008 Mar 28 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 104 0 0 51 36 40 13 3 51 0 125 -15 52 16 56 50 57 5 .. .. .. .. .. .. 105 0 0 51 10 20 13 3 50 1 126 -15 51 50 32 50 30 49 52 43 52 .. .. .. 106 0 0 50 43 54 13 3 50 2 127 -16 51 24 2 50 4 27 52 17 15 .. .. .. 107 0 0 50 17 23 13 3 50 3 128 -17 50 57 25 49 38 0 51 50 32 .. .. .. 108 0 0 49 50 47 13 3 49 4 129 -18 50 30 44 49 11 29 51 23 44 48 21 19 109 0 0 49 24 7 13 3 49 4 129 -19 50 3 59 48 44 55 50 56 52 47 54 51 110 0 0 48 57 25 13 3 48 5 130 -19 49 37 11 48 18 18 50 29 56 47 28 21 111 0 0 48 30 41 13 3 47 6 131 -20 49 10 21 47 51 39 50 2 58 47 1 50 112 0 0 48 3 56 13 3 46 7 132 -21 48 43 30 47 25 1 49 35 58 46 35 18 113 0 0 47 37 11 13 3 45 7 132 -22 48 16 39 46 58 22 49 8 58 46 8 48 114 0 0 47 10 28 13 3 44 8 133 -23 47 49 48 46 31 45 48 41 58 45 42 18 115 0 0 46 43 46 13 3 43 9 134 -23 47 23 0 46 5 10 48 15 0 45 15 51 116 0 0 46 17 7 13 3 41 10 135 -24 46 56 14 45 38 37 47 48 4 44 49 28 117 0 0 45 50 32 13 3 40 11 135 -25 46 29 31 45 12 9 47 21 11 44 23 8 118 0 0 45 24 1 13 3 38 11 136 -26 46 2 53 44 45 46 46 54 23 43 56 54 119 0 0 44 57 37 13 3 36 12 137 -27 45 36 21 44 19 29 46 27 40 43 30 46 120 0 0 44 31 18 13 3 34 13 138 -27 45 9 55 43 53 18 46 1 3 43 4 44 121 0 0 44 5 8 13 3 32 14 138 -28 44 43 36 43 27 15 45 34 33 42 38 50 122 0 0 43 39 5 13 3 30 15 139 -29 44 17 25 43 1 20 45 8 11 42 13 5 123 0 0 43 13 12 13 3 28 15 140 -30 43 51 23 42 35 34 44 41 58 41 47 29 124 0 0 42 47 28 13 3 25 16 141 -31 43 25 32 42 9 59 44 15 55 41 22 3 125 0 0 42 21 55 13 3 22 17 141 -32 42 59 51 41 44 34 43 50 3 40 56 48 126 0 0 41 56 34 13 3 20 18 142 -32 42 34 21 41 19 21 43 24 22 40 31 45 127 0 0 41 31 26 13 3 17 19 143 -33 42 9 4 40 54 21 42 58 53 40 6 55 128 0 0 41 6 30 13 3 14 19 144 -34 41 44 0 40 29 33 42 33 38 39 42 18 129 0 0 40 41 49 13 3 11 20 144 -35 41 19 10 40 5 0 42 8 36 39 17 54 130 0 0 40 17 22 13 3 7 21 145 -36 40 54 35 39 40 41 41 43 49 38 53 46 131 0 0 39 53 11 13 3 4 22 146 -37 40 30 15 39 16 38 41 19 18 38 29 53 132 0 0 39 29 16 13 3 0 22 147 -37 40 6 12 38 52 51 40 55 3 38 6 16 133 0 0 39 5 37 13 2 57 23 148 -38 39 42 25 38 29 21 40 31 4 37 42 55 134 0 0 38 42 16 13 2 53 24 148 -39 39 18 56 38 6 8 40 7 24 37 19 53 135 0 0 38 19 14 13 2 49 25 149 -40 38 55 45 37 43 13 39 44 1 36 57 8 136 0 0 37 56 30 13 2 45 25 150 -41 38 32 52 37 20 37 39 20 57 36 34 42 137 0 0 37 34 5 13 2 41 26 151 -41 38 10 19 36 58 20 38 58 13 36 12 35 138 0 0 37 12 0 13 2 37 27 152 -42 37 48 7 36 36 23 38 35 49 35 50 47 139 0 0 36 50 16 13 2 33 27 153 -43 37 26 14 36 14 47 38 13 46 35 29 20 140 0 0 36 28 53 13 2 28 28 153 -44 37 4 43 35 53 31 37 52 4 35 8 14 141 0 0 36 7 51 13 2 24 29 154 -44 36 43 34 35 32 37 37 30 44 34 47 30 142 0 0 35 47 12 13 2 19 29 155 -45 36 22 46 35 12 5 37 9 46 34 27 7 143 0 0 35 26 55 13 2 14 30 156 -46 36 2 22 34 51 56 36 49 11 34 7 6 144 0 0 35 7 1 13 2 9 31 157 -47 35 42 20 34 32 9 36 28 59 33 47 29 145 0 0 34 47 30 13 2 5 31 158 -47 35 22 42 34 12 45 36 9 11 33 28 14 146 0 0 34 28 24 13 2 0 32 159 -48 35 3 29 33 53 46 35 49 48 33 9 23 147 0 0 34 9 41 13 1 55 32 160 -49 34 44 39 33 35 10 35 30 49 32 50 56 148 0 0 33 51 24 13 1 49 33 161 -49 34 26 15 33 17 0 35 12 15 32 32 54 149 0 0 33 33 31 13 1 44 34 162 -50 34 8 15 32 59 14 34 54 6 32 15 16 150 0 0 33 16 4 13 1 39 34 163 -51 33 50 42 32 41 53 34 36 23 31 58 3 151 0 0 32 59 3 13 1 34 35 164 -51 33 33 34 32 24 58 34 19 7 31 41 16 152 0 0 32 42 28 13 1 28 35 165 -52 33 16 52 32 8 29 34 2 17 31 24 55 153 0 0 32 26 19 13 1 23 36 166 -52 33 0 38 31 52 26 33 45 53 31 8 59 154 0 0 32 10 37 13 1 17 36 167 -53 32 44 50 31 36 50 33 29 57 30 53 30 155 0 0 31 55 22 13 1 12 36 168 -53 32 29 29 31 21 41 33 14 28 30 38 28 156 0 0 31 40 35 13 1 6 37 169 -54 32 14 35 31 6 59 32 59 27 30 23 53 157 0 0 31 26 15 13 1 0 37 170 -54 32 0 10 30 52 44 32 44 54 30 9 45 158 0 0 31 12 22 13 0 54 38 171 -55 31 46 12 30 38 57 32 30 49 29 56 4 159 0 0 30 58 58 13 0 49 38 172 -55 31 32 43 30 25 37 32 17 13 29 42 51 160 0 0 30 46 2 13 0 43 38 174 -56 31 19 42 30 12 46 32 4 5 29 30 5 161 0 0 30 33 34 13 0 37 39 175 -56 31 7 10 30 0 23 31 51 26 29 17 48 162 0 0 30 21 35 13 0 31 39 176 -56 30 55 6 29 48 29 31 39 17 29 5 59 163 0 0 30 10 5 13 0 25 39 177 -57 30 43 32 29 37 3 31 27 36 28 54 39 164 0 0 29 59 4 13 0 19 39 178 -57 30 32 26 29 26 6 31 16 25 28 43 47 165 0 0 29 48 33 13 0 13 39 179 -57 30 21 50 29 15 38 31 5 44 28 33 24 166 0 0 29 38 30 13 0 7 40 181 -57 30 11 44 29 5 39 30 55 33 28 23 30 167 0 0 29 28 57 13 0 1 40 182 -57 30 2 8 28 56 10 30 45 51 28 14 4 168 0 0 29 19 54 12 59 55 40 183 -57 29 53 1 28 47 10 30 36 40 28 5 9 169 0 0 29 11 20 12 59 49 40 184 -58 29 44 24 28 38 39 30 27 58 27 56 42 170 0 0 29 3 17 12 59 43 40 185 -58 29 36 17 28 30 38 30 19 47 27 48 45 171 0 0 28 55 43 12 59 37 40 187 -58 29 28 41 28 23 7 30 12 7 27 41 18 172 0 0 28 48 39 12 59 31 40 188 -58 29 21 35 28 16 7 30 4 57 27 34 20 173 0 0 28 42 6 12 59 25 40 189 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31 48 29 12 55 51 20 228 -33 32 22 40 31 14 44 33 7 46 30 31 26 -144 0 0 32 3 41 12 55 48 19 229 -32 32 37 58 31 29 50 33 23 12 30 46 25 -143 0 0 32 19 21 12 55 45 18 229 -31 32 53 44 31 45 24 33 39 6 31 1 51 -142 0 0 32 35 29 12 55 42 18 230 -30 33 9 58 32 1 25 33 55 29 31 17 45 -141 0 0 32 52 4 12 55 39 17 231 -29 33 26 40 32 17 54 34 12 19 31 34 6 -140 0 0 33 9 6 12 55 37 16 231 -28 33 43 49 32 34 49 34 29 37 31 50 53 -139 0 0 33 26 35 12 55 34 15 232 -28 34 1 24 32 52 12 34 47 22 32 8 7 -138 0 0 33 44 30 12 55 32 14 232 -27 34 19 27 33 10 0 35 5 34 32 25 47 -137 0 0 34 2 52 12 55 29 13 233 -26 34 37 55 33 28 15 35 24 13 32 43 53 -136 0 0 34 21 39 12 55 27 13 234 -25 34 56 50 33 46 55 35 43 17 33 2 25 -135 0 0 34 40 51 12 55 25 12 234 -24 35 16 10 34 6 0 36 2 48 33 21 21 -134 0 0 35 0 29 12 55 23 11 235 -23 35 35 55 34 25 31 36 22 43 33 40 42 -133 0 0 35 20 31 12 55 22 10 236 -22 35 56 5 34 45 25 36 43 3 34 0 27 -132 0 0 35 40 57 12 55 20 9 236 -21 36 16 39 35 5 43 37 3 48 34 20 36 -131 0 0 36 1 46 12 55 19 8 237 -21 36 37 36 35 26 25 37 24 56 34 41 9 -130 0 0 36 22 59 12 55 17 7 237 -20 36 58 57 35 47 30 37 46 28 35 2 4 -129 0 0 36 44 34 12 55 16 7 238 -19 37 20 40 36 8 58 38 8 22 35 23 21 -128 0 0 37 6 31 12 55 15 6 239 -18 37 42 46 36 30 47 38 30 39 35 45 1 -127 0 0 37 28 50 12 55 14 5 239 -17 38 5 13 36 52 57 38 53 18 36 7 1 -126 0 0 37 51 29 12 55 14 4 240 -16 38 28 1 37 15 29 39 16 17 .. .. .. -125 0 0 38 14 29 12 55 13 3 240 -15 38 51 9 37 38 20 39 39 37 .. .. .. -124 0 0 38 37 48 12 55 13 2 241 -14 39 14 37 38 1 31 40 3 16 .. .. .. -123 0 0 39 1 27 12 55 12 1 242 -14 39 38 23 38 25 1 40 27 15 .. .. .. -122 0 0 39 25 23 12 55 12 0 242 -13 40 2 29 38 48 50 .. .. .. .. .. .. Uncertainty in time = +/- 4 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 6109-00545-1 * constellation : Corvus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 26 58.3345 DE: -20 49 14.783 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .024 ) * V mag [mag]: 12.1 * B mag [mag]: 13.0 * Apparent position with proper motion RA(deg): 186.8578362645 DE(deg): -20.8697283156 * Equation of equinoxes (radians) : 0.000040934986841 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (61) Danae approx. diameter [km]: 77 approx. diameter ["]: .043 distance from Earth [AU]: 2.44400 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 641 number of rejected observations: 66 time covered by the observations: 1900 Mar 29 - 2008 Jan 26 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.015, 127° remarks: * orbital elements for (61) Danae : Mean anomaly = 216.31140917 deg Arg. of pericenter = 13.75735098 deg Long. of node = 333.77050488 deg Inclination = 18.22499019 deg Eccentricity = 0.16832356 Semimajor axis = 2.98058246 AU Perihelion dist = 2.47888020 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 54553.54100000 TDT (2008 Mar 28.541) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 28 61 Danae 12h 59.5m UT 12.1 12 26 58.335-20 49 14.78TYC 6109-00545-1 13.0 12.7 77 4.9 2.444 -2.271 3.98 165.5454 -20.821 -13.64 3.26 12.9921 0.09484 0.75836 -8.85149 1.10519 0.00005 0.00179 2000 215.6331772008 325.00000 13.757351333.770505 18.2249900.16832356 2.9805825 2.4788802 7.7 5.00.15 RATE 1.9153690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.028 100 1.65 0.028 0 54510.5020080328_0545-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 20:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org