IOTA/IOTA-ES occultation update for (458) Hercynia / TYC 0057-01291-1 event on 2009 Sep 02, 12:11 UT Visible from Summary ------- On 2009 Sep 02 UT, the 39 km diameter asteroid (458) Hercynia will occult a 11.8 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.8 mag (the magnitude of the asteroid) for at most 3.4 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: 57 * date and approx. time of event: 2009 Sep 02, 12:04 - 2009 Sep 02, 12:10 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 3.4 * Moon: 96 % sunlit, 93° distance * Sun: 110° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 1.09 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .030", 80° ) * approx speed of asteroid's shadow [km/s]: 11.4670 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0057-01291-1 by 458 Hercynia on 2009 Sep 2 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 154 0 0 63 41 39 12 4 19 0 86 -16 63 27 12 63 56 9 .. .. .. 64 27 57 155 0 0 63 43 47 12 4 19 1 86 -16 63 29 21 63 58 16 .. .. .. 64 30 3 156 0 0 63 45 41 12 4 19 1 87 -17 63 31 16 64 0 9 .. .. .. 64 31 55 157 0 0 63 47 21 12 4 20 2 88 -17 63 32 57 64 1 49 .. .. .. 64 33 34 158 0 0 63 48 49 12 4 20 2 89 -17 63 34 24 64 3 16 .. .. .. 64 34 59 159 0 0 63 50 2 12 4 20 3 90 -17 63 35 38 64 4 29 63 4 27 64 36 12 160 0 0 63 51 2 12 4 20 3 91 -17 63 36 39 64 5 29 63 5 28 64 37 11 161 0 0 63 51 49 12 4 21 3 92 -17 63 37 26 64 6 16 63 6 16 64 37 56 162 0 0 63 52 22 12 4 21 4 93 -17 63 38 0 64 6 49 63 6 50 64 38 29 163 0 0 63 52 42 12 4 21 4 94 -17 63 38 19 64 7 8 63 7 10 64 38 48 164 0 0 63 52 48 12 4 22 5 94 -18 63 38 26 64 7 14 63 7 17 64 38 54 165 0 0 63 52 41 12 4 22 5 95 -18 63 38 19 64 7 7 63 7 10 64 38 47 166 0 0 63 52 21 12 4 23 6 96 -18 63 37 58 64 6 46 63 6 49 64 38 26 167 0 0 63 51 47 12 4 24 6 97 -18 63 37 24 64 6 12 63 6 15 64 37 52 168 0 0 63 50 59 12 4 24 7 98 -18 63 36 36 64 5 25 63 5 27 64 37 5 169 0 0 63 49 58 12 4 25 7 99 -18 63 35 35 64 4 24 63 4 25 64 36 4 170 0 0 63 48 43 12 4 26 7 100 -18 63 34 20 64 3 10 63 3 10 64 34 51 171 0 0 63 47 15 12 4 26 8 101 -18 63 32 51 64 1 42 63 1 41 64 33 23 172 0 0 63 45 33 12 4 27 8 102 -18 63 31 9 64 0 0 62 59 57 64 31 43 173 0 0 63 43 37 12 4 28 9 103 -18 63 29 13 63 58 5 62 58 0 64 29 48 174 0 0 63 41 28 12 4 29 9 104 -19 63 27 3 63 55 56 62 55 50 64 27 41 175 0 0 63 39 5 12 4 30 10 104 -19 63 24 40 63 53 34 62 53 25 64 25 20 176 0 0 63 36 28 12 4 31 10 105 -19 63 22 2 63 50 57 62 50 46 64 22 45 177 0 0 63 33 37 12 4 32 11 106 -19 63 19 11 63 48 7 62 47 53 64 19 56 178 0 0 63 30 33 12 4 33 11 107 -19 63 16 5 63 45 4 62 44 46 64 16 54 179 0 0 63 27 14 12 4 34 11 108 -19 63 12 46 63 41 46 62 41 25 64 13 38 180 0 0 63 23 42 12 4 36 12 109 -19 63 9 12 63 38 14 62 37 50 64 10 9 -179 0 0 63 19 55 12 4 37 12 110 -19 63 5 25 63 34 28 62 34 0 64 6 25 -178 0 0 63 15 54 12 4 38 13 111 -19 63 1 23 63 30 28 62 29 56 64 2 27 -177 0 0 63 11 38 12 4 40 13 112 -19 62 57 6 63 26 14 62 25 37 63 58 15 -176 0 0 63 7 9 12 4 41 14 113 -19 62 52 36 63 21 46 62 21 4 63 53 49 -175 0 0 63 2 25 12 4 42 14 114 -19 62 47 50 63 17 3 62 16 16 63 49 9 -174 0 0 62 57 26 12 4 44 15 115 -19 62 42 51 63 12 5 62 11 14 63 44 14 -173 0 0 62 52 13 12 4 46 15 115 -19 62 37 36 63 6 53 62 5 57 63 39 5 -172 0 0 62 46 45 12 4 47 15 116 -19 62 32 7 63 1 27 62 0 25 63 33 42 -171 0 0 62 41 2 12 4 49 16 117 -19 62 26 23 62 55 45 61 54 37 63 28 3 -170 0 0 62 35 4 12 4 51 16 118 -19 62 20 23 62 49 49 61 48 35 63 22 10 -169 0 0 62 28 52 12 4 53 17 119 -19 62 14 9 62 43 38 61 42 18 63 16 2 -168 0 0 62 22 24 12 4 54 17 120 -19 62 7 40 62 37 11 61 35 45 63 9 39 -167 0 0 62 15 40 12 4 56 18 121 -19 62 0 55 62 30 30 61 28 57 63 3 1 -166 0 0 62 8 42 12 4 58 18 122 -19 61 53 55 62 23 33 61 21 53 62 56 8 -165 0 0 62 1 28 12 5 0 19 123 -19 61 46 39 62 16 20 61 14 34 62 48 59 -164 0 0 61 53 58 12 5 2 19 124 -19 61 39 7 62 8 52 61 6 59 62 41 35 -163 0 0 61 46 13 12 5 5 20 125 -19 61 31 20 62 1 9 60 59 8 62 33 56 -162 0 0 61 38 11 12 5 7 20 126 -19 61 23 17 61 53 9 60 51 1 62 26 1 -161 0 0 61 29 54 12 5 9 21 127 -19 61 14 58 61 44 54 60 42 37 62 17 49 -160 0 0 61 21 21 12 5 12 21 128 -19 61 6 23 61 36 23 60 33 58 62 9 22 -159 0 0 61 12 31 12 5 14 21 129 -19 60 57 31 61 27 35 60 25 2 62 0 39 -158 0 0 61 3 25 12 5 17 22 130 -19 60 48 23 61 18 31 60 15 50 61 51 39 -157 0 0 60 54 3 12 5 19 22 131 -19 60 38 59 61 9 11 60 6 21 61 42 24 -156 0 0 60 44 24 12 5 22 23 131 -19 60 29 18 60 59 34 59 56 36 61 32 51 -155 0 0 60 34 28 12 5 25 23 132 -19 60 19 20 60 49 40 59 46 34 61 23 2 -154 0 0 60 24 15 12 5 27 24 133 -19 60 9 5 60 39 30 59 36 14 61 12 57 -153 0 0 60 13 46 12 5 30 24 134 -18 59 58 33 60 29 2 59 25 38 61 2 34 -152 0 0 60 2 59 12 5 33 25 135 -18 59 47 44 60 18 18 59 14 45 60 51 54 -151 0 0 59 51 55 12 5 36 25 136 -18 59 36 38 60 7 16 59 3 34 60 40 58 -150 0 0 59 40 34 12 5 39 26 137 -18 59 25 15 59 55 57 58 52 5 60 29 43 -149 0 0 59 28 55 12 5 43 26 138 -18 59 13 34 59 44 20 58 40 20 60 18 12 -148 0 0 59 16 59 12 5 46 27 139 -18 59 1 35 59 32 26 58 28 16 60 6 23 -147 0 0 59 4 45 12 5 49 27 140 -18 58 49 19 59 20 15 58 15 55 59 54 16 -146 0 0 58 52 13 12 5 53 28 141 -18 58 36 45 59 7 45 58 3 16 59 41 52 -145 0 0 58 39 23 12 5 56 28 142 -17 58 23 53 58 54 58 57 50 20 59 29 10 -144 0 0 58 26 16 12 6 0 29 143 -17 58 10 43 58 41 52 57 37 5 59 16 10 -143 0 0 58 12 50 12 6 4 29 144 -17 57 57 15 58 28 29 57 23 32 59 2 52 -142 0 0 57 59 6 12 6 8 30 145 -17 57 43 29 58 14 48 57 9 41 58 49 15 -141 0 0 57 45 4 12 6 12 30 147 -17 57 29 25 58 0 48 56 55 32 58 35 21 -140 0 0 57 30 44 12 6 16 31 148 -17 57 15 2 57 46 30 56 41 4 58 21 8 -139 0 0 57 16 5 12 6 20 31 149 -16 57 0 21 57 31 54 56 26 19 58 6 37 -138 0 0 57 1 8 12 6 24 32 150 -16 56 45 22 57 16 59 56 11 15 57 51 47 -137 0 0 56 45 53 12 6 28 32 151 -16 56 30 5 57 1 46 55 55 52 57 36 39 -136 0 0 56 30 19 12 6 33 33 152 -16 56 14 29 56 46 14 55 40 11 57 21 13 -135 0 0 56 14 27 12 6 37 33 153 -15 55 58 34 56 30 25 55 24 12 57 5 28 -134 0 0 55 58 17 12 6 42 34 154 -15 55 42 21 56 14 16 55 7 55 56 49 24 -133 0 0 55 41 47 12 6 46 34 155 -15 55 25 50 55 57 49 54 51 19 56 33 2 -132 0 0 55 25 0 12 6 51 35 156 -15 55 9 1 55 41 4 54 34 25 56 16 22 -131 0 0 55 7 54 12 6 56 35 157 -14 54 51 53 55 24 0 54 17 13 55 59 23 -130 0 0 54 50 30 12 7 1 36 159 -14 54 34 27 55 6 38 53 59 42 55 42 5 -129 0 0 54 32 48 12 7 6 36 160 -14 54 16 43 54 48 58 53 41 54 55 24 30 -128 0 0 54 14 48 12 7 12 37 161 -13 53 58 40 54 31 0 53 23 47 55 6 36 -127 0 0 53 56 29 12 7 17 37 162 -13 53 40 20 54 12 43 53 5 23 54 48 24 -126 0 0 53 37 53 12 7 23 38 163 -13 53 21 42 53 54 9 52 46 41 54 29 53 -125 0 0 53 18 59 12 7 28 38 165 -12 53 2 46 53 35 17 52 27 41 54 11 5 -124 0 0 52 59 48 12 7 34 39 166 -12 52 43 33 53 16 7 52 8 24 53 52 0 -123 0 0 52 40 19 12 7 40 39 167 -12 52 24 2 52 56 40 51 48 50 53 32 36 -122 0 0 52 20 33 12 7 46 39 168 -11 52 4 15 52 36 55 51 28 59 53 12 55 -121 0 0 52 0 30 12 7 52 40 170 -11 51 44 10 52 16 54 51 8 51 52 52 57 -120 0 0 51 40 10 12 7 58 40 171 -11 51 23 49 51 56 36 50 48 27 52 32 43 -119 0 0 51 19 34 12 8 4 41 172 -10 51 3 12 51 36 1 50 27 47 52 12 11 -118 0 0 50 58 42 12 8 11 41 173 -10 50 42 18 51 15 10 50 6 50 51 51 23 -117 0 0 50 37 34 12 8 17 42 175 -9 50 21 9 50 54 4 49 45 39 51 30 19 -116 0 0 50 16 10 12 8 24 42 176 -9 49 59 44 50 32 41 49 24 12 51 9 0 -115 0 0 49 54 32 12 8 30 42 178 -8 49 38 5 50 11 4 49 2 30 50 47 25 -114 0 0 49 32 39 12 8 37 43 179 -8 49 16 11 49 49 12 48 40 34 50 25 35 -113 0 0 49 10 31 12 8 44 43 180 -7 48 54 2 49 27 5 48 18 23 50 3 30 -112 0 0 48 48 10 12 8 51 44 182 -7 48 31 40 49 4 45 47 56 0 49 41 12 -111 0 0 48 25 36 12 8 58 44 183 -6 48 9 5 48 42 11 47 33 23 49 18 39 -110 0 0 48 2 48 12 9 6 44 185 -6 47 46 17 48 19 24 47 10 34 48 55 54 -109 0 0 47 39 49 12 9 13 45 186 -5 47 23 17 47 56 25 46 47 32 48 32 56 -108 0 0 47 16 37 12 9 21 45 188 -5 47 0 5 47 33 14 46 24 19 48 9 46 -107 0 0 46 53 14 12 9 28 45 189 -4 46 36 42 47 9 52 46 0 56 47 46 24 -106 0 0 46 29 41 12 9 36 45 191 -4 46 13 8 46 46 18 45 37 21 47 22 51 -105 0 0 46 5 57 12 9 44 46 192 -3 45 49 24 46 22 35 45 13 38 46 59 8 -104 0 0 45 42 4 12 9 51 46 194 -2 45 25 31 45 58 42 44 49 44 46 35 15 -103 0 0 45 18 2 12 9 59 46 195 -2 45 1 30 45 34 40 44 25 43 46 11 13 -102 0 0 44 53 53 12 10 7 46 197 -1 44 37 20 45 10 30 44 1 34 45 47 2 -101 0 0 44 29 35 12 10 15 46 199 0 44 13 3 44 46 12 43 37 17 45 22 44 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0057-01291-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 22 18.2717 DE: +02 15 58.948 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .024 ) * V mag [mag]: 11.8 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (458) Hercynia approx. diameter [km]: 39 approx. diameter ["]: .030 distance from Earth [AU]: 1.77700 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 689 number of rejected observations: 69 time covered by the observations: 1900 Sep 21 - 2007 Sep 21 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.018, 74° remarks: * orbital elements for (458) Hercynia : Mean anomaly = 344.57596252 deg Arg. of pericenter = 275.69872376 deg Long. of node = 134.58397979 deg Inclination = 12.67194100 deg Eccentricity = 0.23714645 Semimajor axis = 2.99662911 AU Perihelion dist = 2.28598917 AU Mag: H = 9.54, G = 0.15 Epoch of elements : MJD 55076.50800000 TDT (2009 Sep 02.508) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 2 458 Hercynia 12h 11.1m UT 11.8 3 22 18.272 2 15 58.95TYC 0057-01291-1 12.3 13.8 39 3.4 1.777 2.001 -11.25 -113.9735 2.270 -2.86 7.76 12.1847 0.23975 0.63741 6.06085 -2.27089 -0.00500 -0.00081 2000 343.3394402009 827.00000275.698724134.583980 12.6719410.23714645 2.9966291 2.2859892 9.6 5.00.15 RATE 1.9000050 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.030 80 2.09 0.033 0 54545.5020090902_1291-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 12:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org