IOTA/IOTA-ES occultation update for (194) Prokne / TYC 0737-00780-1 event on 2009 Apr 01, 09:08 UT Visible from Summary ------- On 2009 Apr 01 UT, the 168 km diameter asteroid (194) Prokne will occult a 11.0 mag star in the constellation Monoceros for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 13.5 mag (the magnitude of the asteroid) for at most 9.2 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: 99 * date and approx. time of event: 2009 Apr 01, 09:07 - 2009 Apr 01, 09:13 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 9.2 * Moon: 36 % sunlit, 21° distance * Sun: 87° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 202 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .024", .024", 88° ) * approx speed of asteroid's shadow [km/s]: 18.3075 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0737-00780-1 by 194 Prokne on 2009 Apr 1 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 132 0 0 -28 34 52 9 7 20 51 360 0 -29 41 2 -27 29 42 -30 22 35 -26 49 45 133 0 0 -27 59 57 9 7 26 52 358 -1 -29 5 57 -26 54 57 -29 47 24 -26 15 6 134 0 0 -27 25 11 9 7 32 53 356 -2 -28 31 0 -26 20 20 -29 12 20 -25 40 36 135 0 0 -26 50 33 9 7 38 53 354 -3 -27 56 12 -25 45 53 -28 37 25 -25 6 15 136 0 0 -26 16 7 9 7 45 53 353 -4 -27 21 34 -25 11 37 -28 2 39 -24 32 6 137 0 0 -25 41 51 9 7 51 54 351 -5 -26 47 7 -24 37 33 -27 28 5 -23 58 8 138 0 0 -25 7 49 9 7 58 54 349 -6 -26 12 53 -24 3 43 -26 53 43 -23 24 24 139 0 0 -24 34 2 9 8 4 55 347 -7 -25 38 53 -23 30 6 -26 19 36 -22 50 55 140 0 0 -24 0 29 9 8 11 55 345 -7 -25 5 8 -22 56 46 -25 45 43 -22 17 42 141 0 0 -23 27 13 9 8 17 55 343 -8 -24 31 39 -22 23 42 -25 12 6 -21 44 46 142 0 0 -22 54 15 9 8 24 55 341 -9 -23 58 28 -21 50 56 -24 38 47 -21 12 7 143 0 0 -22 21 36 9 8 30 56 339 -10 -23 25 36 -21 18 30 -24 5 46 -20 39 48 144 0 0 -21 49 16 9 8 37 56 337 -11 -22 53 3 -20 46 23 -23 33 4 -20 7 49 145 0 0 -21 17 17 9 8 44 56 335 -12 -22 20 51 -20 14 37 -23 0 44 -19 36 11 146 0 0 -20 45 41 9 8 50 56 333 -13 -21 49 1 -19 43 13 -22 28 45 -19 4 55 147 0 0 -20 14 27 9 8 57 56 331 -14 -21 17 33 -19 12 13 -21 57 9 -18 34 2 148 0 0 -19 43 37 9 9 4 56 330 -15 -20 46 30 -18 41 36 -21 25 56 -18 3 33 149 0 0 -19 13 12 9 9 10 56 328 -16 -20 15 51 -18 11 24 -20 55 9 -17 33 29 150 0 0 -18 43 12 9 9 17 56 326 -17 -19 45 37 -17 41 37 -20 24 46 -17 3 51 151 0 0 -18 13 39 9 9 23 56 324 -18 -19 15 50 -17 12 17 -19 54 51 -16 34 39 152 0 0 -17 44 33 9 9 30 55 322 -19 -18 46 31 -16 43 24 -19 25 22 -16 5 54 153 0 0 -17 15 55 9 9 37 55 320 -20 -18 17 39 -16 15 0 -18 56 21 -15 37 37 154 0 0 -16 47 45 9 9 43 55 318 -21 -17 49 16 -15 47 3 -18 27 49 -15 9 48 155 0 0 -16 20 5 9 9 50 55 316 -22 -17 21 22 -15 19 36 -17 59 47 -14 42 29 156 0 0 -15 52 55 9 9 56 54 315 -23 -16 53 58 -14 52 39 -17 32 15 -14 15 40 157 0 0 -15 26 15 9 10 3 54 313 -24 -16 27 5 -14 26 12 -17 5 13 -13 49 21 158 0 0 -15 0 7 9 10 9 53 311 -25 -16 0 44 -14 0 17 -16 38 43 -13 23 33 159 0 0 -14 34 30 9 10 15 53 310 -26 -15 34 54 -13 34 53 -16 12 45 -12 58 16 160 0 0 -14 9 26 9 10 22 52 308 -27 -15 9 36 -13 10 1 -15 47 19 -12 33 32 161 0 0 -13 44 54 9 10 28 52 307 -28 -14 44 51 -12 45 41 -15 22 26 -12 9 20 162 0 0 -13 20 55 9 10 34 51 306 -29 -14 20 40 -12 21 55 -14 58 7 -11 45 41 163 0 0 -12 57 30 9 10 40 51 304 -30 -13 57 3 -11 58 41 -14 34 21 -11 22 35 164 0 0 -12 34 39 9 10 46 50 303 -31 -13 33 59 -11 36 2 -14 11 10 -11 0 2 165 0 0 -12 12 22 9 10 52 49 302 -32 -13 11 30 -11 13 57 -13 48 33 -10 38 4 166 0 0 -11 50 39 9 10 58 49 301 -33 -12 49 36 -10 52 26 -13 26 31 -10 16 40 167 0 0 -11 29 32 9 11 4 48 299 -34 -12 28 17 -10 31 29 -13 5 5 - 9 55 50 168 0 0 -11 9 0 9 11 9 47 298 -35 -12 7 33 -10 11 8 -12 44 14 - 9 35 36 169 0 0 -10 49 3 9 11 15 47 297 -36 -11 47 26 - 9 51 22 -12 23 59 - 9 15 56 170 0 0 -10 29 42 9 11 21 46 296 -37 -11 27 54 - 9 32 11 -12 4 21 - 8 56 52 171 0 0 -10 10 57 9 11 26 45 296 -38 -11 8 58 - 9 13 36 -11 45 18 - 8 38 23 172 0 0 - 9 52 48 9 11 32 44 295 -39 -10 50 39 - 8 55 37 -11 26 53 - 8 20 30 173 0 0 - 9 35 15 9 11 37 43 294 -40 -10 32 56 - 8 38 14 -11 9 4 - 8 3 12 174 0 0 - 9 18 19 9 11 42 43 293 -41 -10 15 50 - 8 21 27 -10 51 52 - 7 46 31 175 0 0 - 9 1 59 9 11 47 42 292 -42 - 9 59 21 - 8 5 16 -10 35 16 - 7 30 26 176 0 0 - 8 46 16 9 11 52 41 292 -43 - 9 43 29 - 7 49 42 -10 19 19 - 7 14 56 177 0 0 - 8 31 10 9 11 57 40 291 -44 - 9 28 14 - 7 34 44 -10 3 58 - 7 0 4 178 0 0 - 8 16 40 9 12 2 39 290 -45 - 9 13 37 - 7 20 23 - 9 49 15 - 6 45 48 179 0 0 - 8 2 48 9 12 7 38 290 -46 - 8 59 36 - 7 6 38 - 9 35 9 - 6 32 8 180 0 0 - 7 49 33 9 12 12 38 289 -47 - 8 46 13 - 6 53 31 - 9 21 41 - 6 19 5 -179 0 0 - 7 36 55 9 12 16 37 289 -48 - 8 33 27 - 6 41 0 - 9 8 51 - 6 6 38 -178 0 0 - 7 24 54 9 12 21 36 288 -49 - 8 21 19 - 6 29 6 - 8 56 39 - 5 54 48 -177 0 0 - 7 13 30 9 12 25 35 288 -50 - 8 9 49 - 6 17 48 - 8 45 4 - 5 43 35 -176 0 0 - 7 2 43 9 12 29 34 287 -51 - 7 58 56 - 6 7 8 - 8 34 7 - 5 32 58 -175 0 0 - 6 52 34 9 12 33 33 287 -52 - 7 48 40 - 5 57 5 - 8 23 47 - 5 22 58 -174 0 0 - 6 43 2 9 12 37 32 286 -53 - 7 39 3 - 5 47 38 - 8 14 6 - 5 13 35 -173 0 0 - 6 34 7 9 12 41 31 286 -54 - 7 30 2 - 5 38 49 - 8 5 2 - 5 4 49 -172 0 0 - 6 25 50 9 12 45 30 286 -55 - 7 21 40 - 5 30 36 - 7 56 36 - 4 56 39 -171 0 0 - 6 18 9 9 12 49 29 285 -56 - 7 13 55 - 5 23 0 - 7 48 48 - 4 49 6 -170 0 0 - 6 11 6 9 12 53 28 285 -57 - 7 6 47 - 5 16 2 - 7 41 38 - 4 42 10 -169 0 0 - 6 4 41 9 12 56 27 285 -58 - 7 0 18 - 5 9 40 - 7 35 6 - 4 35 51 -168 0 0 - 5 58 52 9 12 59 26 284 -59 - 6 54 25 - 5 3 55 - 7 29 11 - 4 30 8 -167 0 0 - 5 53 41 9 13 3 26 284 -60 - 6 49 10 - 4 58 47 - 7 23 54 - 4 25 2 -166 0 0 - 5 49 6 9 13 6 25 284 -61 - 6 44 33 - 4 54 15 - 7 19 15 - 4 20 32 -165 0 0 - 5 45 9 9 13 9 24 284 -62 - 6 40 33 - 4 50 21 - 7 15 13 - 4 16 39 -164 0 0 - 5 41 49 9 13 12 23 283 -63 - 6 37 11 - 4 47 3 - 7 11 49 - 4 13 22 -163 0 0 - 5 39 6 9 13 14 22 283 -64 - 6 34 26 - 4 44 22 - 7 9 3 - 4 10 42 -162 0 0 - 5 37 0 9 13 17 21 283 -65 - 6 32 18 - 4 42 17 - 7 6 54 - 4 8 39 -161 0 0 - 5 35 31 9 13 20 20 283 -66 - 6 30 48 - 4 40 49 - 7 5 23 - 4 7 12 -160 0 0 - 5 34 39 9 13 22 19 283 -67 - 6 29 55 - 4 39 58 - 7 4 29 - 4 6 21 -159 0 0 - 5 34 23 9 13 24 18 282 -68 - 6 29 39 - 4 39 43 - 7 4 13 - 4 6 6 -158 0 0 - 5 34 44 9 13 27 17 282 -69 - 6 30 0 - 4 40 5 - 7 4 34 - 4 6 28 -157 0 0 - 5 35 43 9 13 29 16 282 -70 - 6 30 58 - 4 41 3 - 7 5 32 - 4 7 26 -156 0 0 - 5 37 17 9 13 31 15 282 -71 - 6 32 33 - 4 42 37 - 7 7 7 - 4 9 0 -155 0 0 - 5 39 29 9 13 32 14 282 -72 - 6 34 45 - 4 44 48 - 7 9 20 - 4 11 10 -154 0 0 - 5 42 17 9 13 34 13 282 -73 - 6 37 34 - 4 47 34 - 7 12 10 - 4 13 56 -153 0 0 - 5 45 41 9 13 36 12 282 -74 - 6 41 0 - 4 50 57 - 7 15 36 - 4 17 19 -152 0 0 - 5 49 42 9 13 37 11 281 -75 - 6 45 2 - 4 54 56 - 7 19 40 - 4 21 17 -151 0 0 - 5 54 19 9 13 38 10 281 -76 - 6 49 42 - 4 59 31 - 7 24 21 - 4 25 50 -150 0 0 - 5 59 32 9 13 40 9 281 -77 - 6 54 57 - 5 4 42 - 7 29 38 - 4 31 0 -149 0 0 - 6 5 22 9 13 41 8 281 -78 - 7 0 50 - 5 10 29 - 7 35 32 - 4 36 45 -148 0 0 - 6 11 47 9 13 42 7 281 -79 - 7 7 19 - 5 16 52 - 7 42 3 - 4 43 6 -147 0 0 - 6 18 49 9 13 42 6 281 -80 - 7 14 24 - 5 23 50 - 7 49 10 - 4 50 2 -146 0 0 - 6 26 27 9 13 43 5 281 -81 - 7 22 5 - 5 31 24 - 7 56 54 - 4 57 34 -145 0 0 - 6 34 40 9 13 44 4 281 -82 - 7 30 22 - 5 39 34 - 8 5 14 - 5 5 41 -144 0 0 - 6 43 29 9 13 44 3 281 -83 - 7 39 16 - 5 48 18 - 8 14 10 - 5 14 23 -143 0 0 - 6 52 54 9 13 44 2 280 -84 - 7 48 45 - 5 57 39 - 8 23 43 - 5 23 41 -142 0 0 - 7 2 54 9 13 45 1 280 -85 - 7 58 51 - 6 7 34 - 8 33 51 - 5 33 33 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0737-00780-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 33 03.5148 DE: +10 07 05.491 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 11.0 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (194) Prokne approx. diameter [km]: 168 approx. diameter ["]: .077 distance from Earth [AU]: 3.02600 * orbital information: orbit source: Preston date of fit: 2008 Mar 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 855 number of rejected observations: 135 time covered by the observations: 1913 Apr 04 - 2007 Dec 12 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.010, 79° remarks: * orbital elements for (194) Prokne : Mean anomaly = 139.13854757 deg Arg. of pericenter = 162.98363938 deg Long. of node = 159.47266088 deg Inclination = 18.48596145 deg Eccentricity = 0.23574728 Semimajor axis = 2.61819692 AU Perihelion dist = 2.00096413 AU Mag: H = 7.67, G = 0.15 Epoch of elements : MJD 54922.38100000 TDT (2009 Apr 01.381) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 1 194 Prokne 9h 8.9m UT 11.0 6 33 3.515 10 7 5.49TYC 0737-00780-1 11.1 13.5 168 9.2 3.026 1.818 13.48 131.1697 10.114 43.74 4.66 9.1487 0.24994 -0.49916 9.23297 4.63984 0.00582 -0.00043 2000 138.5846112009 330.00000162.983639159.472661 18.4859610.23574728 2.6181969 2.0009641 7.7 5.00.15 RATE 2.3264870 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.024 0.024 88 1.31 0.024 0 54545.5020090401_0780-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 06:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org