IOTA/IOTA-ES occultation update for (2137) Priscilla / UCAC2 18789908 event on 2009 Jul 04, 04:23 UT Visible from Summary ------- On 2009 Jul 04 UT, the 41 km diameter asteroid (2137) Priscilla will occult a 11.7 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 4.2 mag to 15.9 mag (the magnitude of the asteroid) for at most 3.0 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: 20 * date and approx. time of event: 2009 Jul 04, 04:17 - 2009 Jul 04, 04:27 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 4.2 * estimated maximum duration [s]: 3.0 * Moon: 91 % sunlit, 41° distance * Sun: 169° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 67 * 1 sigma uncertainty interval [path widths]: +/- 3.32 * 1 sigma uncertainty interval [seconds]: +/- 10.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .099 +/- .080) * 1 sigma uncertainty ellipse (major, minor, PA): ( .100", .078", 75° ) * approx speed of asteroid's shadow [km/s]: 13.8112 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 18789908 by 2137 Priscilla on 2009 Jul 4 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 -112 38 13 43 0 0 4 27 5 0 136 -11 -112 3 2 -113 13 10 -108 2 41 ... .. .. -111 17 22 42 0 0 4 27 5 2 137 -13 -110 42 10 -111 52 20 -106 41 16 ... .. .. -109 55 3 41 0 0 4 27 4 3 138 -14 -109 19 45 -110 30 5 -105 17 52 ... .. .. -108 31 4 40 0 0 4 27 3 5 138 -16 -107 55 37 -109 6 14 -103 52 16 ... .. .. -107 5 14 39 0 0 4 27 1 6 139 -17 -106 29 34 -107 40 36 -102 24 15 ... .. .. -105 37 21 38 0 0 4 26 59 8 140 -19 -105 1 23 -106 13 0 -100 53 32 ... .. .. -104 7 10 37 0 0 4 26 56 9 141 -20 -103 30 50 -104 43 10 - 99 19 47 ... .. .. -102 34 26 36 0 0 4 26 53 11 142 -22 -101 57 37 -103 10 52 - 97 42 38 ... .. .. -100 58 49 35 0 0 4 26 48 12 143 -23 -100 21 26 -101 35 47 - 96 1 39 -105 32 16 - 99 19 58 34 0 0 4 26 43 14 144 -25 - 98 41 53 - 99 57 36 - 94 16 19 -103 57 37 - 97 37 27 33 0 0 4 26 38 15 145 -26 - 96 58 32 - 98 15 53 - 92 25 57 -102 20 11 - 95 50 46 32 0 0 4 26 31 17 146 -28 - 95 10 51 - 96 30 9 - 90 29 45 -100 39 37 - 93 59 19 31 0 0 4 26 24 19 148 -30 - 93 18 11 - 94 39 51 - 88 26 40 - 98 55 30 - 92 2 19 30 0 0 4 26 15 20 149 -31 - 91 19 41 - 92 44 14 - 86 15 18 - 97 7 20 - 89 58 47 29 0 0 4 26 6 22 150 -33 - 89 14 20 - 90 42 25 - 83 53 45 - 95 14 32 Latitude Latitude Latitude Latitude - 89 0 0 28 32 40 4 26 1 23 151 -34 28 53 22 28 12 8 31 15 53 26 0 5 - 88 0 0 28 5 34 4 25 56 24 152 -35 28 26 7 27 45 11 30 47 29 25 34 3 - 87 0 0 27 39 17 4 25 51 25 152 -35 27 59 41 27 19 3 30 19 57 25 8 48 - 86 0 0 27 13 49 4 25 45 25 153 -36 27 34 5 26 53 44 29 53 17 24 44 19 - 85 0 0 26 49 10 4 25 40 26 154 -37 27 9 18 26 29 13 29 27 29 24 20 37 - 84 0 0 26 25 21 4 25 34 27 155 -38 26 45 20 26 5 31 29 2 33 23 57 43 - 83 0 0 26 2 20 4 25 28 28 155 -38 26 22 12 25 42 38 28 38 29 23 35 35 - 82 0 0 25 40 9 4 25 22 28 156 -39 25 59 53 25 20 34 28 15 16 23 14 13 - 81 0 0 25 18 46 4 25 16 29 157 -40 25 38 23 24 59 18 27 52 56 22 53 39 - 80 0 0 24 58 12 4 25 10 30 158 -40 25 17 43 24 38 51 27 31 27 22 33 52 - 79 0 0 24 38 28 4 25 4 30 159 -41 24 57 52 24 19 12 27 10 49 22 14 51 - 78 0 0 24 19 32 4 24 58 31 159 -41 24 38 50 24 0 22 26 51 3 21 56 37 - 77 0 0 24 1 24 4 24 52 31 160 -42 24 20 37 23 42 21 26 32 8 21 39 10 - 76 0 0 23 44 6 4 24 45 32 161 -42 24 3 13 23 25 7 26 14 4 21 22 29 - 75 0 0 23 27 36 4 24 39 33 162 -43 23 46 38 23 8 42 25 56 51 21 6 35 - 74 0 0 23 11 54 4 24 32 33 163 -43 23 30 51 22 53 6 25 40 29 20 51 28 - 73 0 0 22 57 1 4 24 25 34 164 -44 23 15 54 22 38 17 25 24 58 20 37 7 - 72 0 0 22 42 56 4 24 18 34 165 -44 23 1 44 22 24 17 25 10 17 20 23 33 - 71 0 0 22 29 40 4 24 12 35 166 -44 22 48 24 22 11 4 24 56 27 20 10 45 - 70 0 0 22 17 11 4 24 5 35 167 -45 22 35 52 21 58 39 24 43 27 19 58 43 - 69 0 0 22 5 31 4 23 58 35 167 -45 22 24 8 21 47 2 24 31 17 19 47 28 - 68 0 0 21 54 39 4 23 51 36 168 -45 22 13 12 21 36 13 24 19 57 19 36 58 - 67 0 0 21 44 34 4 23 44 36 169 -45 22 3 4 21 26 12 24 9 28 19 27 15 - 66 0 0 21 35 18 4 23 37 36 170 -46 21 53 45 21 16 58 23 59 48 19 18 18 - 65 0 0 21 26 49 4 23 29 37 171 -46 21 45 14 21 8 32 23 50 58 19 10 7 - 64 0 0 21 19 8 4 23 22 37 172 -46 21 37 30 21 0 53 23 42 58 19 2 43 - 63 0 0 21 12 14 4 23 15 37 173 -46 21 30 35 20 54 1 23 35 48 18 56 4 - 62 0 0 21 6 8 4 23 8 37 174 -46 21 24 27 20 47 57 23 29 27 18 50 10 - 61 0 0 21 0 50 4 23 1 37 175 -46 21 19 7 20 42 41 23 23 56 18 45 3 - 60 0 0 20 56 19 4 22 53 38 177 -46 21 14 35 20 38 11 23 19 14 18 40 42 - 59 0 0 20 52 36 4 22 46 38 178 -46 21 10 51 20 34 29 23 15 21 18 37 6 - 58 0 0 20 49 40 4 22 39 38 179 -46 21 7 54 20 31 34 23 12 18 18 34 16 - 57 0 0 20 47 32 4 22 31 38 180 -46 21 5 45 20 29 26 23 10 5 18 32 12 - 56 0 0 20 46 11 4 22 24 38 181 -46 21 4 23 20 28 5 23 8 40 18 30 54 - 55 0 0 20 45 37 4 22 17 38 182 -46 21 3 49 20 27 32 23 8 5 18 30 21 - 54 0 0 20 45 51 4 22 9 38 183 -45 21 4 3 20 27 45 23 8 20 18 30 34 - 53 0 0 20 46 52 4 22 2 38 184 -45 21 5 5 20 28 46 23 9 23 18 31 33 - 52 0 0 20 48 40 4 21 55 38 185 -45 21 6 54 20 30 34 23 11 16 18 33 18 - 51 0 0 20 51 16 4 21 48 38 186 -44 21 9 30 20 33 9 23 13 59 18 35 48 - 50 0 0 20 54 39 4 21 40 37 187 -44 21 12 55 20 36 32 23 17 31 18 39 5 - 49 0 0 20 58 50 4 21 33 37 188 -44 21 17 7 20 40 41 23 21 52 18 43 7 - 48 0 0 21 3 49 4 21 26 37 189 -43 21 22 7 20 45 38 23 27 3 18 47 55 - 47 0 0 21 9 35 4 21 19 37 190 -43 21 27 55 20 51 22 23 33 3 18 53 28 - 46 0 0 21 16 8 4 21 12 36 191 -43 21 34 30 20 57 54 23 39 53 18 59 48 - 45 0 0 21 23 30 4 21 5 36 192 -42 21 41 54 21 5 13 23 47 32 19 6 54 - 44 0 0 21 31 39 4 20 58 36 193 -42 21 50 5 21 13 20 23 56 2 19 14 45 - 43 0 0 21 40 35 4 20 51 35 194 -41 21 59 5 21 22 14 24 5 21 19 23 23 - 42 0 0 21 50 20 4 20 44 35 195 -40 22 8 52 21 31 56 24 15 30 19 32 47 - 41 0 0 22 0 53 4 20 37 35 196 -40 22 19 28 21 42 25 24 26 30 19 42 57 - 40 0 0 22 12 14 4 20 30 34 197 -39 22 30 52 21 53 43 24 38 19 19 53 54 - 39 0 0 22 24 22 4 20 23 34 198 -39 22 43 5 22 5 48 24 50 59 20 5 36 - 38 0 0 22 37 19 4 20 16 33 198 -38 22 56 6 22 18 41 25 4 29 20 18 5 - 37 0 0 22 51 5 4 20 10 33 199 -37 23 9 56 22 32 22 25 18 49 20 31 21 - 36 0 0 23 5 38 4 20 3 32 200 -37 23 24 34 22 46 51 25 34 1 20 45 23 - 35 0 0 23 21 1 4 19 57 32 201 -36 23 40 1 23 2 9 25 50 3 21 0 12 - 34 0 0 23 37 11 4 19 50 31 202 -35 23 56 17 23 18 15 26 6 56 21 15 47 - 33 0 0 23 54 11 4 19 44 31 203 -35 24 13 22 23 35 9 26 24 40 21 32 9 - 32 0 0 24 11 59 4 19 38 30 204 -34 24 31 16 23 52 52 26 43 15 21 49 18 - 31 0 0 24 30 36 4 19 32 29 204 -33 24 49 59 24 11 23 27 2 41 22 7 13 - 30 0 0 24 50 2 4 19 26 29 205 -32 25 9 31 24 30 43 27 22 59 22 25 56 - 29 0 0 25 10 17 4 19 20 28 206 -31 25 29 52 24 50 51 27 44 9 22 45 25 - 28 0 0 25 31 21 4 19 14 27 207 -31 25 51 3 25 11 48 28 6 10 23 5 42 - 27 0 0 25 53 14 4 19 8 26 207 -30 26 13 4 25 33 35 28 29 3 23 26 45 - 26 0 0 26 15 57 4 19 3 26 208 -29 26 35 53 25 56 10 28 52 48 23 48 35 - 25 0 0 26 39 28 4 18 58 25 209 -28 26 59 33 26 19 33 29 17 25 24 11 13 - 24 0 0 27 3 49 4 18 52 24 209 -27 27 24 2 26 43 46 29 42 55 24 34 37 - 23 0 0 27 28 59 4 18 47 23 210 -26 27 49 20 27 8 48 30 9 16 24 58 48 - 22 0 0 27 54 58 4 18 42 23 211 -25 28 15 28 27 34 39 30 36 30 25 23 47 - 21 0 0 28 21 47 4 18 37 22 212 -24 28 42 26 28 1 18 31 4 36 25 49 32 - 20 0 0 28 49 25 4 18 33 21 212 -24 29 10 14 28 28 47 31 33 34 26 16 4 - 19 0 0 29 17 51 4 18 28 20 213 -23 29 38 50 28 57 4 32 3 25 26 43 22 - 18 0 0 29 47 7 4 18 24 19 213 -22 30 8 17 29 26 9 32 34 8 27 11 27 - 17 0 0 30 17 12 4 18 20 18 214 -21 30 38 32 29 56 4 33 5 43 27 40 19 - 16 0 0 30 48 6 4 18 16 17 215 -20 31 9 37 30 26 47 33 38 11 28 9 56 - 15 0 0 31 19 48 4 18 12 16 215 -19 31 41 30 30 58 17 34 11 31 28 40 20 - 14 0 0 31 52 18 4 18 8 16 216 -18 32 14 13 31 30 36 34 45 43 29 11 29 - 13 0 0 32 25 37 4 18 5 15 217 -17 32 47 44 32 3 43 35 20 47 29 43 24 - 12 0 0 32 59 43 4 18 2 14 217 -16 33 22 3 32 37 37 35 56 43 30 16 4 - 11 0 0 33 34 37 4 17 59 13 218 -15 33 57 10 33 12 17 36 33 30 30 49 28 - 10 0 0 34 10 17 4 17 56 12 218 -14 34 33 4 33 47 45 37 11 8 31 23 36 - 9 0 0 34 46 44 4 17 53 11 219 -13 35 9 45 34 23 58 37 49 37 31 58 29 - 8 0 0 35 23 58 4 17 51 10 220 -12 35 47 13 35 0 57 38 28 56 32 34 4 - 7 0 0 36 1 56 4 17 49 9 220 -11 36 25 27 35 38 42 39 9 5 33 10 22 - 6 0 0 36 40 40 4 17 47 8 221 -10 37 4 26 36 17 10 39 50 3 .. .. .. - 5 0 0 37 20 7 4 17 45 7 222 -9 37 44 10 36 56 22 40 31 49 .. .. .. - 4 0 0 38 0 18 4 17 44 6 222 -8 38 24 37 37 36 17 41 14 24 .. .. .. - 3 0 0 38 41 11 4 17 43 5 223 -7 39 5 47 38 16 53 41 57 45 .. .. .. - 2 0 0 39 22 45 4 17 42 4 223 -6 39 47 39 38 58 11 42 41 53 .. .. .. - 1 0 0 40 5 0 4 17 41 3 224 -5 40 30 11 39 40 8 43 26 46 .. .. .. 0 0 0 40 47 54 4 17 41 2 225 -4 41 13 23 40 22 44 .. .. .. .. .. .. 1 0 0 41 31 25 4 17 40 1 225 -2 41 57 14 41 5 58 .. .. .. .. .. .. Uncertainty in time = +/- 12 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 18789908 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 24 29.0255 DE: -31 29 46.276 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .047, .058 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2137) Priscilla approx. diameter [km]: 41 approx. diameter ["]: .024 distance from Earth [AU]: 2.36900 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 692 number of rejected observations: 23 time covered by the observations: 1936 Aug 24 - 2008 Feb 16 1 sigma uncertainty ellipse (major, minor, PA): 0.089, 0.053, 71° remarks: * orbital elements for (2137) Priscilla : Mean anomaly = 191.79055730 deg Arg. of pericenter = 135.21122543 deg Long. of node = 320.09584784 deg Inclination = 11.71560956 deg Eccentricity = 0.05993501 Semimajor axis = 3.18526051 AU Perihelion dist = 2.99435190 AU Mag: H = 11.02, G = 0.15 Epoch of elements : MJD 55016.18300000 TDT (2009 Jul 04.183) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 4 2137 Priscilla 4h 22.4m UT 11.7 19 24 29.025-31 29 46.28UCAC2 18789908 0.0 15.9 41 3.0 2.369 -2.262 0.48 -56.7932 -31.496 115.51 22.87 4.3730 0.01320 0.78888 -7.79435 0.12855 -0.00069 0.00083 2000 190.7185792009 628.00000135.211225320.095848 11.7156100.05993501 3.1852605 2.994351911.1 5.00.15 RATE 1.7337510 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.100 0.078 75 4.32 0.079 0 54545.5020090704_789908 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org