IOTA/IOTA-ES occultation update for (658) Asteria / TYC 1881-00601-1 event on 2008 Oct 14, 15:54 UT Visible from New Guinea Summary ------- On 2008 Oct 14 UT, the 23 km diameter asteroid (658) Asteria will occult a 9.5 mag star in the constellation Gemini for observers along a path across New Guinea. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.9 mag to 15.4 mag (the magnitude of the asteroid) for at most 3.1 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: 41 * date and approx. time of event: 2008 Oct 14, 15:39 - 2008 Oct 14, 15:58 UT * midpoint of event [JD]: 2454754.16260833 * magnitude of target star: 9.5 * magnitude drop [mag]: 5.9 * estimated maximum duration [s]: 3.1 * Moon: 100 % sunlit, 74° distance * Sun: 109° distance * rough path description: New Guinea The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 1.58 * 1 sigma uncertainty interval [seconds]: +/- 6.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .022", 92° ) * approx speed of asteroid's shadow [km/s]: 7.3468 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1881-00601-1 by 658 Asteria on 2008 Oct 14 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 112 0 0 -12 52 8 15 39 54 1 64 -67 -12 59 9 -12 45 7 -13 21 21 -12 22 57 113 0 0 -12 23 18 15 39 55 2 64 -68 -12 30 20 -12 16 17 -12 52 32 -11 54 7 114 0 0 -11 54 22 15 39 56 3 63 -68 -12 1 23 -11 47 20 -12 23 36 -11 25 9 115 0 0 -11 25 18 15 39 57 4 63 -69 -11 32 20 -11 18 16 -11 54 33 -10 56 5 116 0 0 -10 56 9 15 39 58 5 63 -70 -11 3 11 -10 49 7 -11 25 25 -10 26 55 117 0 0 -10 26 55 15 40 0 7 63 -71 -10 33 57 -10 19 53 -10 56 11 - 9 57 41 118 0 0 - 9 57 36 15 40 2 8 63 -71 -10 4 38 - 9 50 34 -10 26 53 - 9 28 22 119 0 0 - 9 28 14 15 40 4 9 62 -72 - 9 35 16 - 9 21 12 - 9 57 31 - 8 59 0 120 0 0 - 8 58 49 15 40 7 10 62 -73 - 9 5 51 - 8 51 47 - 9 28 6 - 8 29 35 121 0 0 - 8 29 23 15 40 10 11 62 -73 - 8 36 25 - 8 22 21 - 8 58 39 - 8 0 9 122 0 0 - 7 59 55 15 40 14 12 62 -74 - 8 6 57 - 7 52 53 - 8 29 12 - 7 30 41 123 0 0 - 7 30 28 15 40 18 13 62 -74 - 7 37 29 - 7 23 26 - 7 59 43 - 7 1 14 124 0 0 - 7 1 0 15 40 22 14 62 -74 - 7 8 2 - 6 53 59 - 7 30 16 - 6 31 47 125 0 0 - 6 31 35 15 40 26 15 62 -75 - 6 38 36 - 6 24 33 - 7 0 49 - 6 2 22 126 0 0 - 6 2 11 15 40 31 17 61 -75 - 6 9 13 - 5 55 10 - 6 31 25 - 5 33 0 127 0 0 - 5 32 51 15 40 36 18 61 -75 - 5 39 52 - 5 25 50 - 6 2 4 - 5 3 41 128 0 0 - 5 3 35 15 40 41 19 61 -75 - 5 10 36 - 4 56 34 - 5 32 47 - 4 34 25 129 0 0 - 4 34 24 15 40 47 20 61 -75 - 4 41 24 - 4 27 23 - 5 3 35 - 4 5 15 130 0 0 - 4 5 18 15 40 53 21 61 -75 - 4 12 18 - 3 58 18 - 4 34 28 - 3 36 11 131 0 0 - 3 36 19 15 41 0 22 61 -75 - 3 43 19 - 3 29 19 - 4 5 27 - 3 7 13 132 0 0 - 3 7 28 15 41 6 23 61 -74 - 3 14 27 - 3 0 28 - 3 36 34 - 2 38 23 133 0 0 - 2 38 44 15 41 13 24 61 -74 - 2 45 43 - 2 31 45 - 3 7 49 - 2 9 42 134 0 0 - 2 10 10 15 41 21 26 61 -73 - 2 17 9 - 2 3 11 - 2 39 13 - 1 41 9 135 0 0 - 1 41 46 15 41 28 27 61 -73 - 1 48 44 - 1 34 47 - 2 10 47 - 1 12 47 136 0 0 - 1 13 32 15 41 36 28 60 -72 - 1 20 30 - 1 6 34 - 1 42 31 - 0 44 35 137 0 0 - 0 45 30 15 41 45 29 60 -72 - 0 52 27 - 0 38 33 - 1 14 27 - 0 16 35 138 0 0 - 0 17 40 15 41 53 30 60 -71 - 0 24 37 - 0 10 44 - 0 46 35 0 11 12 139 0 0 0 9 56 15 42 2 31 60 -70 0 3 0 0 16 52 - 0 18 56 0 38 46 140 0 0 0 37 19 15 42 11 32 60 -69 0 30 23 0 44 14 0 8 29 1 6 6 141 0 0 1 4 27 15 42 21 33 60 -69 0 57 32 1 11 22 0 35 39 1 33 12 142 0 0 1 31 19 15 42 31 35 60 -68 1 24 25 1 38 14 1 2 35 2 0 2 143 0 0 1 57 56 15 42 41 36 60 -67 1 51 2 2 4 49 1 29 14 2 26 35 144 0 0 2 24 15 15 42 51 37 60 -66 2 17 22 2 31 8 1 55 36 2 52 52 145 0 0 2 50 17 15 43 1 38 60 -65 2 43 25 2 57 9 2 21 41 3 18 51 146 0 0 3 16 1 15 43 12 39 60 -64 3 9 9 3 22 52 2 47 28 3 44 32 147 0 0 3 41 26 15 43 23 40 60 -63 3 34 35 3 48 17 3 12 55 4 9 54 148 0 0 4 6 31 15 43 35 41 60 -62 3 59 41 4 13 21 3 38 4 4 34 56 149 0 0 4 31 16 15 43 46 42 60 -61 4 24 27 4 38 6 4 2 52 4 59 38 150 0 0 4 55 41 15 43 58 44 59 -60 4 48 52 5 2 29 4 27 20 5 23 59 151 0 0 5 19 44 15 44 10 45 59 -59 5 12 56 5 26 32 4 51 26 5 47 59 152 0 0 5 43 25 15 44 22 46 59 -59 5 36 38 5 50 12 5 15 11 6 11 37 153 0 0 6 6 44 15 44 34 47 59 -58 5 59 58 6 13 30 5 38 33 6 34 53 154 0 0 6 29 40 15 44 47 48 59 -57 6 22 54 6 36 25 6 1 32 6 57 45 155 0 0 6 52 12 15 45 0 49 59 -56 6 45 28 6 58 57 6 24 8 7 20 14 156 0 0 7 14 21 15 45 13 50 59 -54 7 7 37 7 21 5 6 46 20 7 42 20 157 0 0 7 36 5 15 45 26 51 59 -53 7 29 22 7 42 48 7 8 8 8 4 1 158 0 0 7 57 25 15 45 39 52 58 -52 7 50 43 8 4 7 7 29 31 8 25 17 159 0 0 8 18 19 15 45 53 53 58 -51 8 11 38 8 25 1 7 50 29 8 46 8 160 0 0 8 38 48 15 46 6 54 58 -50 8 32 8 8 45 29 8 11 1 9 6 33 161 0 0 8 58 51 15 46 20 55 58 -49 8 52 11 9 5 31 8 31 7 9 26 33 162 0 0 9 18 28 15 46 34 56 58 -48 9 11 49 9 25 6 8 50 47 9 46 6 163 0 0 9 37 38 15 46 48 58 57 -47 9 30 59 9 44 16 9 10 0 10 5 12 164 0 0 9 56 21 15 47 2 59 57 -46 9 49 43 10 2 58 9 28 47 10 23 52 165 0 0 10 14 36 15 47 17 60 57 -45 10 8 0 10 21 13 9 47 6 10 42 5 166 0 0 10 32 25 15 47 31 61 56 -44 10 25 49 10 39 0 10 4 58 10 59 50 167 0 0 10 49 45 15 47 46 62 56 -43 10 43 10 10 56 20 10 22 22 11 17 7 168 0 0 11 6 38 15 48 0 63 55 -42 11 0 4 11 13 12 10 39 17 11 33 57 169 0 0 11 23 3 15 48 15 64 55 -41 11 16 29 11 29 36 10 55 45 11 50 18 170 0 0 11 38 59 15 48 30 65 54 -40 11 32 26 11 45 31 11 11 44 12 6 11 171 0 0 11 54 26 15 48 45 66 54 -39 11 47 54 12 0 58 11 27 15 12 21 35 172 0 0 12 9 25 15 49 0 67 53 -38 12 2 53 12 15 56 11 42 16 12 36 31 173 0 0 12 23 54 15 49 15 68 52 -37 12 17 24 12 30 25 11 56 49 12 50 57 174 0 0 12 37 55 15 49 30 69 51 -36 12 31 25 12 44 24 12 10 52 13 4 55 175 0 0 12 51 26 15 49 46 70 50 -35 12 44 57 12 57 55 12 24 26 13 18 24 176 0 0 13 4 28 15 50 1 70 49 -34 12 57 59 13 10 56 12 37 31 13 31 23 177 0 0 13 17 0 15 50 16 71 47 -33 13 10 32 13 23 28 12 50 6 13 43 52 178 0 0 13 29 3 15 50 32 72 46 -32 13 22 36 13 35 30 13 2 11 13 55 53 179 0 0 13 40 36 15 50 47 73 44 -31 13 34 9 13 47 3 13 13 47 14 7 23 180 0 0 13 51 39 15 51 3 74 42 -30 13 45 13 13 58 5 13 24 52 14 18 24 -179 0 0 14 2 13 15 51 18 75 40 -29 13 55 47 14 8 38 13 35 28 14 28 55 -178 0 0 14 12 16 15 51 34 76 38 -28 14 5 51 14 18 41 13 45 34 14 38 57 -177 0 0 14 21 50 15 51 49 76 35 -27 14 15 25 14 28 14 13 55 9 14 48 28 -176 0 0 14 30 53 15 52 5 77 32 -26 14 24 29 14 37 17 14 4 15 14 57 29 -175 0 0 14 39 26 15 52 21 78 29 -25 14 33 3 14 45 50 14 12 50 15 6 1 -174 0 0 14 47 30 15 52 36 78 25 -24 14 41 6 14 53 53 14 20 55 15 14 2 -173 0 0 14 55 3 15 52 52 79 21 -23 14 48 40 15 1 25 14 28 30 15 21 33 -172 0 0 15 2 5 15 53 8 79 16 -22 14 55 43 15 8 28 14 35 34 15 28 35 -171 0 0 15 8 38 15 53 23 80 11 -21 15 2 16 15 15 0 14 42 8 15 35 6 -170 0 0 15 14 40 15 53 39 80 6 -20 15 8 18 15 21 2 14 48 12 15 41 7 -169 0 0 15 20 12 15 53 54 80 1 -19 15 13 51 15 26 33 14 53 45 15 46 37 -168 0 0 15 25 14 15 54 10 80 355 -17 15 18 53 15 31 35 14 58 48 15 51 38 -167 0 0 15 29 45 15 54 26 80 350 -16 15 23 24 15 36 6 15 3 20 15 56 8 -166 0 0 15 33 46 15 54 41 80 344 -15 15 27 26 15 40 7 15 7 22 16 0 8 -165 0 0 15 37 17 15 54 57 79 339 -14 15 30 57 15 43 37 15 10 54 16 3 38 -164 0 0 15 40 17 15 55 12 79 334 -13 15 33 57 15 46 38 15 13 55 16 6 38 -163 0 0 15 42 48 15 55 28 79 330 -12 15 36 28 15 49 8 15 16 26 16 9 7 -162 0 0 15 44 47 15 55 43 78 326 -11 15 38 27 15 51 7 15 18 26 16 11 7 -161 0 0 15 46 17 15 55 59 78 322 -10 15 39 57 15 52 37 15 19 56 16 12 36 -160 0 0 15 47 16 15 56 14 77 319 -9 15 40 56 15 53 36 15 20 55 16 13 35 -159 0 0 15 47 45 15 56 29 76 316 -8 15 41 26 15 54 5 15 21 25 16 14 4 -158 0 0 15 47 44 15 56 45 76 313 -7 15 41 24 15 54 4 15 21 23 16 14 3 -157 0 0 15 47 13 15 57 0 75 311 -6 15 40 53 15 53 32 15 20 52 16 13 31 -156 0 0 15 46 11 15 57 15 74 309 -5 15 39 51 15 52 31 15 19 50 16 12 30 -155 0 0 15 44 39 15 57 30 73 307 -4 15 38 19 15 50 59 15 18 18 16 10 58 -154 0 0 15 42 37 15 57 45 72 306 -3 15 36 17 15 48 57 15 16 15 16 8 57 -153 0 0 15 40 5 15 58 0 71 304 -2 15 33 45 15 46 25 15 13 43 16 6 25 -152 0 0 15 37 3 15 58 15 71 303 -1 15 30 43 15 43 23 15 10 40 16 3 24 -151 0 0 15 33 31 15 58 30 70 302 0 15 27 10 15 39 51 15 7 7 15 59 52 Uncertainty in time = +/- 7 secs [Prediction of 2008 Aug 6.0] Data for the target star ------------------------ * name: TYC 1881-00601-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 12 12.1972 DE: +25 13 56.045 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .013, .017 ) * V mag [mag]: 9.5 * B mag [mag]: 9.9 * Apparent position with proper motion RA(deg): 93.1918505417 DE(deg): 25.2312419594 * Equation of equinoxes (radians) : 0.000047280474692 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (658) Asteria approx. diameter [km]: 23 approx. diameter ["]: .014 distance from Earth [AU]: 2.19300 * orbital information: orbit source: Preston date of fit: 2008 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 986 number of rejected observations: 68 time covered by the observations: 1906 Aug 24 - 2008 Jan 12 1 sigma uncertainty ellipse (major, minor, PA): 0.028, 0.014, 92° remarks: * orbital elements for (658) Asteria : Mean anomaly = 16.57239983 deg Arg. of pericenter = 62.21863056 deg Long. of node = 351.17577035 deg Inclination = 1.50594763 deg Eccentricity = 0.06242456 Semimajor axis = 2.85438241 AU Perihelion dist = 2.67619884 AU Mag: H = 10.33, G = 0.15 Epoch of elements : MJD 54753.66300000 TDT (2008 Oct 14.663) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 14 658 Asteria 15h 54.2m UT 9.5 6 12 12.197 25 13 56.04TYC 1881-00601-1 9.9 15.4 23 3.1 2.193 1.221 1.37 -169.0550 25.232 -62.07 -8.45 15.9026 0.01462 -0.17206 4.13262 0.34201 -0.00541 0.00005 2000 15.82376020081011.00000 62.218631351.175770 1.5059480.06242456 2.8543824 2.676198810.5 5.00.15 RATE 2.0437880 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.022 92 2.58 0.023 0 54684.5020081014_0601-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 19:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org