IOTA/IOTA-ES occultation update for (885) Ulrike / UCAC2 24475398 event on 2009 Aug 02, 05:58 UT Visible from Summary ------- On 2009 Aug 02 UT, the 33 km diameter asteroid (885) Ulrike will occult a 11.8 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 14.5 mag (the magnitude of the asteroid) for at most 3.6 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: 34 * date and approx. time of event: 2009 Aug 02, 05:52 - 2009 Aug 02, 06:04 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 3.6 * Moon: 87 % sunlit, 23° distance * Sun: 161° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 62 * 1 sigma uncertainty interval [path widths]: +/- 1.98 * 1 sigma uncertainty interval [seconds]: +/- 7.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .062 +/- .051) * 1 sigma uncertainty ellipse (major, minor, PA): ( .062", .051", 87° ) * approx speed of asteroid's shadow [km/s]: 9.1769 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 24475398 by 885 Ulrike on 2009 Aug 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 ' " Longitude Longitude Longitude Longitude - 67 30 29 65 0 0 5 52 31 1 217 -6 - 68 21 29 - 66 39 37 - 71 44 53 ... .. .. - 69 19 21 64 0 0 5 52 32 2 215 -7 - 70 8 50 - 68 30 0 - 73 26 25 ... .. .. - 71 6 10 63 0 0 5 52 33 3 213 -9 - 71 54 19 - 70 18 11 - 75 6 43 ... .. .. - 72 51 22 62 0 0 5 52 35 5 212 -10 - 73 38 19 - 72 4 34 - 76 46 6 ... .. .. - 74 35 17 61 0 0 5 52 38 6 210 -11 - 75 21 11 - 73 49 34 - 78 24 52 ... .. .. - 76 18 17 60 0 0 5 52 41 7 209 -12 - 77 3 14 - 75 33 31 - 80 3 18 - 72 37 57 - 78 0 39 59 0 0 5 52 45 9 207 -13 - 78 44 46 - 77 16 43 - 81 41 39 - 74 24 35 - 79 42 40 58 0 0 5 52 50 10 206 -14 - 80 26 4 - 78 59 28 - 83 20 11 - 76 10 21 - 81 24 36 57 0 0 5 52 56 11 204 -15 - 82 7 22 - 80 42 3 - 84 59 8 - 77 55 33 - 83 6 42 56 0 0 5 53 2 12 203 -16 - 83 48 57 - 82 24 42 - 86 38 44 - 79 40 27 - 84 49 14 55 0 0 5 53 9 14 201 -17 - 85 31 2 - 84 7 40 - 88 19 13 - 81 25 20 - 86 32 26 54 0 0 5 53 17 15 200 -18 - 87 13 53 - 85 51 14 - 90 0 49 - 83 10 27 - 88 16 33 53 0 0 5 53 26 16 198 -19 - 88 57 45 - 87 35 38 - 91 43 48 - 84 56 4 - 90 1 50 52 0 0 5 53 35 17 197 -20 - 90 42 52 - 89 21 6 - 93 28 26 - 86 42 25 - 91 48 34 51 0 0 5 53 45 19 195 -21 - 92 29 31 - 91 7 56 - 95 14 59 - 88 29 47 - 93 37 2 50 0 0 5 53 57 20 194 -22 - 94 18 0 - 92 56 23 - 97 3 46 - 90 18 25 - 95 27 31 49 0 0 5 54 9 21 192 -23 - 96 8 37 - 94 46 46 - 98 55 8 - 92 8 37 - 97 20 23 48 0 0 5 54 22 22 190 -24 - 98 1 43 - 96 39 26 -100 49 28 - 94 0 40 - 99 16 0 47 0 0 5 54 37 24 188 -25 - 99 57 42 - 98 34 43 -102 47 14 - 95 54 56 -101 14 48 46 0 0 5 54 52 25 186 -25 -101 57 0 -100 33 3 -104 48 56 - 97 51 46 -103 17 17 45 0 0 5 55 9 26 184 -26 -104 0 9 -102 34 55 -106 55 14 - 99 51 35 Latitude Latitude Latitude Latitude -105 0 0 44 11 13 5 55 23 27 183 -26 44 31 35 43 51 5 45 54 39 42 33 28 -106 0 0 43 43 23 5 55 32 27 182 -26 44 3 35 43 23 25 45 25 57 42 6 22 -107 0 0 43 16 4 5 55 41 28 181 -27 43 36 6 42 56 15 44 57 47 41 39 46 -108 0 0 42 49 16 5 55 50 28 179 -27 43 9 9 42 29 35 44 30 9 41 13 40 -109 0 0 42 22 59 5 55 59 29 178 -27 42 42 43 42 3 27 44 3 4 40 48 4 -110 0 0 41 57 13 5 56 8 29 177 -27 42 16 49 41 37 51 43 36 32 40 22 58 -111 0 0 41 32 1 5 56 17 29 176 -27 41 51 28 41 12 46 43 10 35 39 58 24 -112 0 0 41 7 21 5 56 27 30 175 -27 41 26 39 40 48 14 42 45 11 39 34 22 -113 0 0 40 43 14 5 56 36 30 174 -27 41 2 25 40 24 15 42 20 22 39 10 51 -114 0 0 40 19 41 5 56 45 30 173 -27 40 38 44 40 0 50 41 56 8 38 47 53 -115 0 0 39 56 42 5 56 55 31 172 -27 40 15 37 39 37 58 41 32 29 38 25 28 -116 0 0 39 34 17 5 57 5 31 171 -27 39 53 5 39 15 40 41 9 26 38 3 36 -117 0 0 39 12 27 5 57 14 31 170 -27 39 31 8 38 53 57 40 46 59 37 42 18 -118 0 0 38 51 12 5 57 24 31 169 -27 39 9 46 38 32 48 40 25 9 37 21 33 -119 0 0 38 30 32 5 57 34 32 168 -27 38 48 59 38 12 14 40 3 54 37 1 23 -120 0 0 38 10 27 5 57 44 32 167 -27 38 28 49 37 52 15 39 43 17 36 41 47 -121 0 0 37 50 58 5 57 54 32 166 -26 38 9 14 37 32 52 39 23 16 36 22 46 -122 0 0 37 32 5 5 58 4 32 164 -26 37 50 15 37 14 5 39 3 53 36 4 19 -123 0 0 37 13 48 5 58 14 32 163 -26 37 31 52 36 55 53 38 45 7 35 46 28 -124 0 0 36 56 8 5 58 24 32 162 -26 37 14 6 36 38 18 38 26 58 35 29 11 -125 0 0 36 39 4 5 58 33 32 161 -26 36 56 57 36 21 19 38 9 27 35 12 31 -126 0 0 36 22 36 5 58 43 32 160 -25 36 40 25 36 4 57 37 52 35 34 56 26 -127 0 0 36 6 46 5 58 53 32 159 -25 36 24 30 35 49 11 37 36 20 34 40 57 -128 0 0 35 51 33 5 59 3 32 158 -25 36 9 12 35 34 2 37 20 43 34 26 4 -129 0 0 35 36 57 5 59 13 32 157 -24 35 54 32 35 19 30 37 5 45 34 11 48 -130 0 0 35 22 58 5 59 23 32 156 -24 35 40 29 35 5 35 36 51 25 33 58 7 -131 0 0 35 9 37 5 59 33 32 155 -24 35 27 4 34 52 18 36 37 44 33 45 4 -132 0 0 34 56 53 5 59 42 32 154 -23 35 14 17 34 39 37 36 24 42 33 32 37 -133 0 0 34 44 47 5 59 52 31 153 -23 35 2 8 34 27 35 36 12 19 33 20 46 -134 0 0 34 33 19 6 0 2 31 152 -22 34 50 37 34 16 10 36 0 34 33 9 33 -135 0 0 34 22 29 6 0 11 31 151 -22 34 39 44 34 5 23 35 49 29 32 58 57 -136 0 0 34 12 18 6 0 21 31 150 -21 34 29 30 33 55 14 35 39 2 32 48 58 -137 0 0 34 2 44 6 0 30 30 149 -21 34 19 53 33 45 43 35 29 15 32 39 36 -138 0 0 33 53 49 6 0 40 30 148 -20 34 10 56 33 36 50 35 20 8 32 30 52 -139 0 0 33 45 32 6 0 49 30 147 -20 34 2 37 33 28 35 35 11 40 32 22 45 -140 0 0 33 37 54 6 0 58 30 146 -19 33 54 57 33 20 59 35 3 51 32 15 16 -141 0 0 33 30 54 6 1 7 29 145 -19 33 47 55 33 14 1 34 56 42 32 8 24 -142 0 0 33 24 33 6 1 16 29 144 -18 33 41 33 33 7 42 34 50 13 32 2 11 -143 0 0 33 18 51 6 1 25 28 143 -17 33 35 49 33 2 1 34 44 24 31 56 35 -144 0 0 33 13 48 6 1 34 28 142 -17 33 30 45 32 56 59 34 39 14 31 51 37 -145 0 0 33 9 24 6 1 42 28 141 -16 33 26 20 32 52 36 34 34 45 31 47 18 -146 0 0 33 5 39 6 1 51 27 140 -16 33 22 34 32 48 51 34 30 56 31 43 36 -147 0 0 33 2 33 6 1 59 27 139 -15 33 19 27 32 45 46 34 27 47 31 40 33 -148 0 0 33 0 6 6 2 7 26 139 -14 33 17 0 32 43 20 34 25 18 31 38 9 -149 0 0 32 58 19 6 2 15 26 138 -14 33 15 13 32 41 33 34 23 29 31 36 22 -150 0 0 32 57 11 6 2 23 25 137 -13 33 14 5 32 40 25 34 22 21 31 35 14 -151 0 0 32 56 43 6 2 31 24 136 -12 33 13 37 32 39 56 34 21 54 31 34 45 -152 0 0 32 56 54 6 2 39 24 135 -12 33 13 48 32 40 7 34 22 7 31 34 55 -153 0 0 32 57 45 6 2 46 23 135 -11 33 14 40 32 40 58 34 23 1 31 35 43 -154 0 0 32 59 15 6 2 53 23 134 -10 33 16 11 32 42 28 34 24 35 31 37 11 -155 0 0 33 1 26 6 3 0 22 133 -9 33 18 23 32 44 37 34 26 51 31 39 17 -156 0 0 33 4 17 6 3 7 21 132 -9 33 21 14 32 47 27 34 29 47 31 42 2 -157 0 0 33 7 47 6 3 14 21 132 -8 33 24 46 32 50 56 34 33 25 31 45 26 -158 0 0 33 11 58 6 3 21 20 131 -7 33 28 58 32 55 5 34 37 43 31 49 30 -159 0 0 33 16 48 6 3 27 19 130 -6 33 33 51 32 59 54 34 42 43 31 54 12 -160 0 0 33 22 19 6 3 33 19 130 -6 33 39 24 33 5 23 34 48 24 31 59 34 -161 0 0 33 28 31 6 3 39 18 129 -5 33 45 37 33 11 32 34 54 47 32 5 35 -162 0 0 33 35 22 6 3 45 17 128 -4 33 52 31 33 18 21 35 1 51 32 12 16 -163 0 0 33 42 54 6 3 50 17 128 -3 34 0 6 33 25 51 35 9 36 32 19 36 -164 0 0 33 51 7 6 3 55 16 127 -2 34 8 21 33 34 1 35 18 3 32 27 36 -165 0 0 34 0 0 6 4 0 15 126 -2 34 17 17 33 42 51 35 27 12 32 36 15 -166 0 0 34 9 34 6 4 5 14 126 -1 34 26 54 33 52 22 35 37 2 32 45 34 Uncertainty in time = +/- 8 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 24475398 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 29 03.9291 DE: -19 09 13.643 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .041, .042 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (885) Ulrike approx. diameter [km]: 33 approx. diameter ["]: .026 distance from Earth [AU]: 1.71700 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 952 number of rejected observations: 49 time covered by the observations: 1906 Aug 24 - 2008 Feb 03 1 sigma uncertainty ellipse (major, minor, PA): 0.046, 0.029, 84° remarks: * orbital elements for (885) Ulrike : Mean anomaly = 320.52393398 deg Arg. of pericenter = 205.02805441 deg Long. of node = 149.07616533 deg Inclination = 3.30400406 deg Eccentricity = 0.18973569 Semimajor axis = 3.09313618 AU Perihelion dist = 2.50625786 AU Mag: H = 10.65, G = 0.15 Epoch of elements : MJD 55045.24900000 TDT (2009 Aug 02.249) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 2 885 Ulrike 5h 58.6m UT 11.8 19 29 3.929-19 9 13.64UCAC2 24475398 0.0 14.5 33 3.6 1.717 -1.794 -7.51 -108.3635 -19.151 91.91 17.71 5.9774 -0.23940 0.81078 -4.96754 -1.46724 0.00183 0.00003 2000 319.5729312009 728.00000205.028054149.076165 3.3040040.18973569 3.0931362 2.506257910.7 5.00.15 RATE 1.8117800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.062 0.051 87 2.98 0.052 0 54545.5020090802_475398 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org