IOTA/IOTA-ES occultation update for (542) Susanna / TYC 5827-00098-1 event on 2008 Oct 12, 14:41 UT Visible from E Russia, China, SE Asia Summary ------- On 2008 Oct 12 UT, the 42 km diameter asteroid (542) Susanna will occult a 9.2 mag star in the constellation Aquarius for observers along a path across E Russia, China, SE Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 13.2 mag (the magnitude of the asteroid) for at most 7.5 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: 74 * date and approx. time of event: 2008 Oct 12, 14:26 - 2008 Oct 12, 14:54 UT * magnitude of target star: 9.2 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 7.5 * Moon: 94 % sunlit, 13° distance * Sun: 144° distance * rough path description: E Russia, China, SE Asia The occultation path -------------------- * approximate projected width [km]: 50 * 1 sigma uncertainty interval [path widths]: +/- 0.77 * 1 sigma uncertainty interval [seconds]: +/- 6.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .024", 83° ) * approx speed of asteroid's shadow [km/s]: 5.5380 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5827-00098-1 by 542 Susanna on 2008 Oct 12 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 150 33 21 72 0 0 14 26 21 1 219 -25 149 36 25 151 30 44 148 9 35 153 0 4 148 4 35 71 0 0 14 26 22 2 216 -27 147 11 33 148 57 59 145 50 31 150 20 57 Latitude Latitude Latitude Latitude 147 0 0 70 31 56 14 26 23 3 215 -27 70 54 57 70 9 5 71 30 44 69 34 12 146 0 0 70 4 41 14 26 23 3 214 -28 70 28 1 69 41 32 71 4 17 69 6 13 145 0 0 69 36 17 14 26 24 4 213 -28 69 59 55 69 12 50 70 36 41 68 37 4 144 0 0 69 6 40 14 26 25 4 212 -29 69 30 37 68 42 55 70 7 51 68 6 42 143 0 0 68 35 48 14 26 26 5 211 -29 69 0 3 68 11 46 69 37 47 67 35 6 142 0 0 68 3 39 14 26 28 6 210 -30 68 28 11 67 39 18 69 6 24 67 2 13 141 0 0 67 30 9 14 26 30 6 210 -30 67 54 59 67 5 31 68 33 40 66 28 0 140 0 0 66 55 16 14 26 31 7 209 -31 67 20 24 66 30 22 67 59 33 65 52 26 139 0 0 66 18 59 14 26 34 8 208 -31 66 44 24 65 53 48 67 23 59 65 15 28 138 0 0 65 41 15 14 26 36 9 207 -32 66 6 55 65 15 48 66 46 57 64 37 4 137 0 0 65 2 1 14 26 39 9 206 -33 65 27 57 64 36 20 66 8 24 63 57 14 136 0 0 64 21 17 14 26 42 10 205 -33 64 47 28 63 55 21 65 28 19 63 15 54 135 0 0 63 39 1 14 26 46 11 204 -34 64 5 26 63 12 51 64 46 39 62 33 5 134 0 0 62 55 11 14 26 50 12 203 -35 63 21 49 62 28 49 64 3 22 61 48 44 133 0 0 62 9 47 14 26 54 13 202 -35 62 36 37 61 43 15 63 18 29 61 2 53 132 0 0 61 22 49 14 26 59 14 201 -36 61 49 49 60 56 6 62 31 58 60 15 30 131 0 0 60 34 16 14 27 5 14 201 -37 61 1 25 60 7 25 61 43 50 59 26 36 130 0 0 59 44 10 14 27 11 15 200 -37 60 11 27 59 17 11 60 54 4 58 36 11 129 0 0 58 52 30 14 27 17 16 199 -38 59 19 53 58 25 25 60 2 40 57 44 16 128 0 0 57 59 19 14 27 24 17 198 -39 58 26 47 57 32 9 59 9 42 56 50 54 127 0 0 57 4 38 14 27 32 18 197 -40 57 32 9 56 37 25 58 15 9 55 56 5 126 0 0 56 8 29 14 27 41 19 196 -40 56 36 2 55 41 15 57 19 5 54 59 54 125 0 0 55 10 57 14 27 50 21 195 -41 55 38 29 54 43 43 56 21 32 54 2 21 124 0 0 54 12 3 14 27 59 22 194 -42 54 39 34 53 44 50 55 22 34 53 3 31 123 0 0 53 11 52 14 28 10 23 193 -43 53 39 20 52 44 43 54 22 15 52 3 28 122 0 0 52 10 28 14 28 21 24 192 -43 52 37 51 51 43 23 53 20 39 51 2 16 121 0 0 51 7 55 14 28 33 25 192 -44 51 35 12 50 40 57 52 17 50 49 59 59 120 0 0 50 4 20 14 28 46 26 191 -45 50 31 29 49 37 29 51 13 55 48 56 41 119 0 0 48 59 45 14 28 59 27 190 -45 49 26 46 48 33 3 50 8 57 47 52 29 118 0 0 47 54 18 14 29 13 29 189 -46 48 21 8 47 27 46 49 3 4 46 47 27 117 0 0 46 48 4 14 29 28 30 188 -47 47 14 43 46 21 43 47 56 20 45 41 40 116 0 0 45 41 8 14 29 44 31 187 -47 46 7 34 45 14 59 46 48 51 44 35 14 115 0 0 44 33 36 14 30 0 32 186 -48 44 59 49 44 7 40 45 40 45 43 28 14 114 0 0 43 25 34 14 30 17 33 185 -48 43 51 33 42 59 52 44 32 6 42 20 46 113 0 0 42 17 8 14 30 35 34 184 -49 42 42 52 41 51 40 43 23 1 41 12 56 112 0 0 41 8 23 14 30 54 36 183 -49 41 33 51 40 43 10 42 13 36 40 4 48 111 0 0 39 59 24 14 31 13 37 182 -49 40 24 37 39 34 27 41 3 55 38 56 28 110 0 0 38 50 18 14 31 32 38 181 -50 39 15 14 38 25 36 39 54 6 37 48 1 109 0 0 37 41 9 14 31 53 39 179 -50 38 5 48 37 16 43 38 44 14 36 39 32 108 0 0 36 32 2 14 32 14 40 178 -50 36 56 24 36 7 53 37 34 22 35 31 6 107 0 0 35 23 2 14 32 35 41 177 -50 35 47 7 34 59 9 36 24 38 34 22 48 106 0 0 34 14 13 14 32 57 42 176 -50 34 38 1 33 50 37 35 15 4 33 14 41 105 0 0 33 5 40 14 33 20 44 174 -50 33 29 11 32 42 21 34 5 47 32 6 50 104 0 0 31 57 27 14 33 43 45 173 -50 32 20 40 31 34 25 32 56 49 30 59 18 103 0 0 30 49 38 14 34 6 46 172 -50 31 12 34 30 26 52 31 48 15 29 52 11 102 0 0 29 42 15 14 34 30 47 170 -50 30 4 54 29 19 47 30 40 9 28 45 30 101 0 0 28 35 24 14 34 54 48 169 -49 28 57 46 28 13 11 29 32 34 27 39 19 100 0 0 27 29 5 14 35 18 48 167 -49 27 51 11 27 7 9 28 25 32 26 33 41 99 0 0 26 23 24 14 35 43 49 166 -49 26 45 13 26 1 44 27 19 8 25 28 39 98 0 0 25 18 21 14 36 7 50 164 -48 25 39 54 24 56 57 26 13 24 24 24 16 97 0 0 24 14 0 14 36 32 51 162 -48 24 35 17 23 52 51 25 8 22 23 20 33 96 0 0 23 10 22 14 36 58 52 161 -47 23 31 24 22 49 29 24 4 4 22 17 34 95 0 0 22 7 30 14 37 23 52 159 -47 22 28 17 21 46 52 23 0 33 21 15 19 94 0 0 21 5 26 14 37 48 53 157 -46 21 25 58 20 45 2 21 57 50 20 13 52 93 0 0 20 4 11 14 38 14 54 155 -46 20 24 28 19 44 1 20 55 57 19 13 13 92 0 0 19 3 47 14 38 39 54 153 -45 19 23 50 18 43 51 19 54 57 18 13 23 91 0 0 18 4 15 14 39 5 55 151 -44 18 24 4 17 44 33 18 54 49 17 14 26 90 0 0 17 5 36 14 39 30 55 149 -44 17 25 12 16 46 8 17 55 35 16 16 20 89 0 0 16 7 52 14 39 56 55 147 -43 16 27 14 15 48 37 16 57 17 15 19 9 88 0 0 15 11 4 14 40 21 56 145 -42 15 30 13 14 52 1 15 59 55 14 22 52 87 0 0 14 15 11 14 40 47 56 143 -41 14 34 8 13 56 20 15 3 30 13 27 31 86 0 0 13 20 16 14 41 12 56 141 -40 13 39 0 13 1 37 14 8 3 12 33 5 85 0 0 12 26 18 14 41 37 56 139 -39 12 44 50 12 7 51 13 13 34 11 39 37 84 0 0 11 33 18 14 42 2 56 137 -39 11 51 39 11 15 3 12 20 4 10 47 6 83 0 0 10 41 17 14 42 26 56 135 -38 10 59 26 10 23 13 11 27 34 9 55 33 82 0 0 9 50 15 14 42 51 56 133 -37 10 8 13 9 32 21 10 36 4 9 4 58 81 0 0 9 0 12 14 43 15 56 131 -36 9 17 59 8 42 29 9 45 33 8 15 21 80 0 0 8 11 8 14 43 40 56 129 -35 8 28 46 7 53 36 8 56 3 7 26 43 79 0 0 7 23 4 14 44 3 56 127 -34 7 40 32 7 5 42 8 7 33 6 39 5 78 0 0 6 36 0 14 44 27 56 125 -33 6 53 18 6 18 47 7 20 4 5 52 25 77 0 0 5 49 56 14 44 51 55 124 -32 6 7 4 5 32 53 6 33 35 5 6 44 76 0 0 5 4 52 14 45 14 55 122 -31 5 21 50 4 47 57 5 48 7 4 22 3 75 0 0 4 20 47 14 45 37 55 120 -30 4 37 37 4 4 2 5 3 39 3 38 21 74 0 0 3 37 42 14 45 59 54 119 -29 3 54 23 3 21 5 4 20 12 2 55 37 73 0 0 2 55 37 14 46 21 54 117 -28 3 12 9 2 39 8 3 37 45 2 13 53 72 0 0 2 14 30 14 46 43 53 116 -27 2 30 54 1 58 10 2 56 17 1 33 7 71 0 0 1 34 23 14 47 5 53 114 -26 1 50 40 1 18 11 2 15 50 0 53 20 70 0 0 0 55 15 14 47 26 52 113 -25 1 11 24 0 39 11 1 36 22 0 14 31 69 0 0 0 17 6 14 47 47 51 112 -24 0 33 7 0 1 9 0 57 54 - 0 23 19 68 0 0 - 0 20 5 14 48 8 51 111 -23 - 0 4 11 - 0 35 55 0 20 24 - 1 0 12 67 0 0 - 0 56 17 14 48 28 50 110 -22 - 0 40 31 - 1 12 1 - 0 16 7 - 1 36 7 66 0 0 - 1 31 32 14 48 48 49 109 -21 - 1 15 52 - 1 47 9 - 0 51 39 - 2 11 5 65 0 0 - 2 5 49 14 49 8 49 108 -20 - 1 50 16 - 2 21 19 - 1 26 13 - 2 45 6 64 0 0 - 2 39 9 14 49 27 48 107 -19 - 2 23 42 - 2 54 33 - 1 59 49 - 3 18 10 63 0 0 - 3 11 32 14 49 46 47 106 -18 - 2 56 12 - 3 26 50 - 2 32 28 - 3 50 17 62 0 0 - 3 42 59 14 50 5 47 106 -17 - 3 27 44 - 3 58 10 - 3 4 10 - 4 21 29 61 0 0 - 4 13 29 14 50 23 46 105 -16 - 3 58 20 - 4 28 35 - 3 34 55 - 4 51 44 60 0 0 - 4 43 3 14 50 41 45 104 -15 - 4 28 0 - 4 58 3 - 4 4 43 - 5 21 5 59 0 0 - 5 11 42 14 50 59 44 104 -14 - 4 56 44 - 5 26 37 - 4 33 35 - 5 49 30 58 0 0 - 5 39 25 14 51 16 43 103 -13 - 5 24 33 - 5 54 15 - 5 1 32 - 6 17 1 57 0 0 - 6 6 14 14 51 33 43 103 -12 - 5 51 26 - 6 20 59 - 5 28 34 - 6 43 37 56 0 0 - 6 32 8 14 51 50 42 102 -11 - 6 17 25 - 6 46 49 - 5 54 40 - 7 9 19 55 0 0 - 6 57 8 14 52 6 41 102 -10 - 6 42 30 - 7 11 44 - 6 19 52 - 7 34 8 54 0 0 - 7 21 14 14 52 22 40 101 -9 - 7 6 40 - 7 35 46 - 6 44 9 - 7 58 3 53 0 0 - 7 44 27 14 52 37 39 101 -8 - 7 29 57 - 7 58 54 - 7 7 33 - 8 21 5 52 0 0 - 8 6 47 14 52 52 39 101 -7 - 7 52 21 - 8 21 10 - 7 30 3 - 8 43 15 51 0 0 - 8 28 13 14 53 7 38 100 -6 - 8 13 51 - 8 42 33 - 7 51 39 - 9 4 32 50 0 0 - 8 48 47 14 53 22 37 100 -5 - 8 34 29 - 9 3 3 - 8 12 23 - 9 24 56 49 0 0 - 9 8 29 14 53 36 36 100 -4 - 8 54 15 - 9 22 42 - 8 32 14 - 9 44 30 48 0 0 - 9 27 19 14 53 50 35 100 -4 - 9 13 8 - 9 41 28 - 8 51 12 -10 3 11 47 0 0 - 9 45 17 14 54 3 34 100 -3 - 9 31 9 - 9 59 23 - 9 9 18 -10 21 1 46 0 0 -10 2 24 14 54 16 33 99 -2 - 9 48 19 -10 16 27 - 9 26 32 -10 38 0 45 0 0 -10 18 39 14 54 29 32 99 -1 -10 4 37 -10 32 39 - 9 42 55 -10 54 8 Uncertainty in time = +/- 7 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 5827-00098-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 15 21.6503 DE: -13 21 26.301 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .020 ) * V mag [mag]: 9.2 * B mag [mag]: 10.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (542) Susanna approx. diameter [km]: 42 approx. diameter ["]: .036 distance from Earth [AU]: 1.62800 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 856 number of rejected observations: 61 time covered by the observations: 1904 Aug 17 - 2008 Sep 18 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.014, 80° remarks: * orbital elements for (542) Susanna : Mean anomaly = 352.92003068 deg Arg. of pericenter = 214.63262736 deg Long. of node = 153.06192984 deg Inclination = 12.07575761 deg Eccentricity = 0.13877602 Semimajor axis = 2.90612183 AU Perihelion dist = 2.50282180 AU Mag: H = 9.29, G = 0.15 Epoch of elements : MJD 54751.61200000 TDT (2008 Oct 12.612) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 12 542 Susanna 14h 42.3m UT 9.2 23 15 21.650-13 21 26.30TYC 5827-00098-1 10.7 13.2 42 7.5 1.628 -0.819 -11.88 106.7260 -13.353 -43.98 -7.69 14.7046 -0.39058 0.39233 -2.21764 -2.20292 0.00274 0.00186 2000 352.59933120081011.00000214.632627153.061930 12.0757580.13877602 2.9061218 2.5028218 9.4 5.00.15 RATE 1.9894520 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.024 83 1.77 0.027 0 54740.5020081012_0098-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org