IOTA/IOTA-ES occultation update for (255) Oppavia / TYC 2441-01329-1 event on 2008 Mar 26, 19:18 UT Visible from Scandanavia, Russia, SW Asia Summary ------- On 2008 Mar 26 UT, the 57 km diameter asteroid (255) Oppavia will occult a 12.7 mag star in the constellation Gemini for observers along a path across Scandanavia, Russia, SW Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 15.3 mag (the magnitude of the asteroid) for at most 4.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 80 * date and approx. time of event: 2008 Mar 26, 19:16 - 2008 Mar 26, 19:24 UT * magnitude of target star: 12.7 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 4.0 * Moon: 78 % sunlit, 140° distance * Sun: 96° distance * rough path description: Scandanavia, Russia, SW Asia The occultation path -------------------- * approximate projected width [km]: 69 * 1 sigma uncertainty interval [path widths]: +/- 0.68 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .024", .024", 93° ) * approx speed of asteroid's shadow [km/s]: 14.5217 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2441-01329-1 by 255 Oppavia on 2008 Mar 26 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 - 9 0 0 72 30 33 19 16 0 50 180 0 72 8 26 72 52 47 71 38 32 73 23 12 - 8 0 0 72 18 48 19 16 2 50 181 0 71 56 30 72 41 13 71 26 22 73 11 54 - 7 0 0 72 6 36 19 16 5 51 183 -1 71 44 7 72 29 12 71 13 44 73 0 8 - 6 0 0 71 53 55 19 16 8 51 184 -1 71 31 15 72 16 43 71 0 36 72 47 55 - 5 0 0 71 40 45 19 16 11 51 185 -2 71 17 53 72 3 45 70 46 59 72 35 14 - 4 0 0 71 27 5 19 16 13 51 187 -2 71 4 1 71 50 17 70 32 51 72 22 3 - 3 0 0 71 12 54 19 16 16 51 188 -2 70 49 38 71 36 18 70 18 11 72 8 21 - 2 0 0 70 58 10 19 16 19 52 189 -3 70 34 41 71 21 47 70 2 58 71 54 8 - 1 0 0 70 42 53 19 16 22 52 191 -3 70 19 11 71 6 43 69 47 11 71 39 22 0 0 0 70 27 1 19 16 26 52 192 -3 70 3 6 70 51 5 69 30 48 71 24 2 1 0 0 70 10 33 19 16 29 52 194 -4 69 46 25 70 34 51 69 13 49 71 8 7 2 0 0 69 53 29 19 16 32 52 195 -4 69 29 6 70 18 0 68 56 12 70 51 36 3 0 0 69 35 45 19 16 36 53 197 -5 69 11 9 70 0 31 68 37 56 70 34 27 4 0 0 69 17 23 19 16 39 53 198 -5 68 52 32 69 42 23 68 19 0 70 16 39 5 0 0 68 58 19 19 16 43 53 200 -6 68 33 14 69 23 34 67 59 23 69 58 11 6 0 0 68 38 33 19 16 46 53 201 -6 68 13 13 69 4 3 67 39 2 69 39 0 7 0 0 68 18 2 19 16 50 53 203 -7 67 52 28 68 43 48 67 17 57 69 19 7 8 0 0 67 56 47 19 16 54 53 205 -7 67 30 57 68 22 48 66 56 6 68 58 28 9 0 0 67 34 44 19 16 58 54 206 -8 67 8 39 68 1 1 66 33 28 68 37 3 10 0 0 67 11 54 19 17 2 54 208 -8 66 45 33 67 38 26 66 10 1 68 14 50 11 0 0 66 48 13 19 17 7 54 210 -9 66 21 36 67 15 1 65 45 44 67 51 48 12 0 0 66 23 40 19 17 11 54 211 -9 65 56 48 66 50 45 65 20 34 67 27 54 13 0 0 65 58 15 19 17 15 54 213 -10 65 31 7 66 25 35 64 54 32 67 3 7 14 0 0 65 31 54 19 17 20 54 215 -10 65 4 30 65 59 31 64 27 34 66 37 25 15 0 0 65 4 37 19 17 25 54 217 -11 64 36 57 65 32 30 63 59 40 66 10 47 16 0 0 64 36 22 19 17 30 55 218 -12 64 8 26 65 4 31 63 30 48 65 43 11 17 0 0 64 7 7 19 17 35 55 220 -12 63 38 55 64 35 32 63 0 57 65 14 35 18 0 0 63 36 51 19 17 40 55 222 -13 63 8 24 64 5 32 62 30 4 64 44 58 19 0 0 63 5 32 19 17 45 55 224 -13 62 36 49 63 34 29 61 58 9 64 14 17 20 0 0 62 33 8 19 17 51 55 226 -14 62 4 10 63 2 22 61 25 10 63 42 32 21 0 0 61 59 39 19 17 56 55 228 -15 61 30 26 62 29 8 60 51 6 63 9 40 22 0 0 61 25 3 19 18 2 55 230 -16 60 55 35 61 54 47 60 15 55 62 35 40 23 0 0 60 49 18 19 18 8 55 232 -16 60 19 36 61 19 17 59 39 37 62 0 31 24 0 0 60 12 24 19 18 14 55 234 -17 59 42 28 60 42 37 59 2 11 61 24 11 25 0 0 59 34 20 19 18 20 55 236 -18 59 4 10 60 4 46 58 23 35 60 46 40 26 0 0 58 55 3 19 18 27 55 238 -19 58 24 41 59 25 44 57 43 49 60 7 56 27 0 0 58 14 35 19 18 33 55 240 -20 57 44 0 58 45 28 57 2 52 59 27 58 28 0 0 57 32 54 19 18 40 54 242 -21 57 2 8 58 3 59 56 20 44 58 46 46 29 0 0 56 50 1 19 18 47 54 244 -21 56 19 3 57 21 17 55 37 25 58 4 19 30 0 0 56 5 54 19 18 54 54 247 -22 55 34 46 56 37 20 54 52 55 57 20 38 31 0 0 55 20 35 19 19 1 54 249 -23 54 49 18 55 52 10 54 7 15 56 35 41 32 0 0 54 34 3 19 19 9 54 251 -24 54 2 38 55 5 47 53 20 24 55 49 30 33 0 0 53 46 19 19 19 16 53 253 -25 53 14 47 54 18 11 52 32 23 55 2 5 34 0 0 52 57 25 19 19 24 53 255 -26 52 25 47 53 29 24 51 43 15 54 13 26 35 0 0 52 7 22 19 19 32 52 257 -27 51 35 38 52 39 26 50 52 59 53 23 36 36 0 0 51 16 11 19 19 40 52 259 -28 50 44 23 51 48 19 50 1 39 52 32 36 37 0 0 50 23 54 19 19 48 52 261 -29 49 52 3 50 56 6 49 9 15 51 40 26 38 0 0 49 30 34 19 19 56 51 263 -31 48 58 41 50 2 47 48 15 50 50 47 11 39 0 0 48 36 12 19 20 4 50 265 -32 48 4 19 49 8 27 47 21 27 49 52 51 40 0 0 47 40 53 19 20 12 50 267 -33 47 9 0 48 13 7 46 26 9 48 57 31 41 0 0 46 44 38 19 20 21 49 269 -34 46 12 47 47 16 51 45 29 58 48 1 12 42 0 0 45 47 32 19 20 29 48 271 -35 45 15 43 46 19 42 44 32 58 47 3 59 43 0 0 44 49 38 19 20 37 48 273 -36 44 17 53 45 21 44 43 35 13 46 5 56 44 0 0 43 51 0 19 20 46 47 274 -38 43 19 20 44 23 0 42 36 47 45 7 5 45 0 0 42 51 42 19 20 54 46 276 -39 42 20 8 43 23 36 41 37 43 44 7 32 46 0 0 41 51 48 19 21 3 45 278 -40 41 20 22 42 23 35 40 38 6 43 7 21 47 0 0 40 51 24 19 21 11 44 279 -41 40 20 5 41 23 1 39 38 0 42 6 35 48 0 0 39 50 32 19 21 19 43 281 -43 39 19 23 40 22 0 38 37 30 41 5 21 49 0 0 38 49 18 19 21 28 42 282 -44 38 18 19 39 20 36 37 36 39 40 3 42 50 0 0 37 47 47 19 21 36 41 283 -45 37 16 59 38 18 54 36 35 34 39 1 44 51 0 0 36 46 3 19 21 44 40 285 -47 36 15 27 37 16 58 35 34 17 37 59 32 52 0 0 35 44 12 19 21 52 39 286 -48 35 13 47 36 14 54 34 32 54 36 57 9 53 0 0 34 42 17 19 22 0 38 287 -49 34 12 5 35 12 46 33 31 29 35 54 42 54 0 0 33 40 23 19 22 7 37 288 -51 33 10 25 34 10 38 32 30 7 34 52 15 55 0 0 32 38 35 19 22 15 36 289 -52 32 8 52 33 8 35 31 28 52 33 49 52 56 0 0 31 36 57 19 22 22 35 290 -53 31 7 29 32 6 43 30 27 48 32 47 38 57 0 0 30 35 34 19 22 29 33 291 -54 30 6 20 31 5 4 29 27 0 31 45 38 58 0 0 29 34 29 19 22 36 32 292 -56 29 5 31 30 3 43 28 26 31 30 43 55 59 0 0 28 33 47 19 22 43 31 293 -57 28 5 4 29 2 45 27 26 24 29 42 34 60 0 0 27 33 30 19 22 49 30 294 -58 27 5 3 28 2 12 26 26 45 28 41 39 61 0 0 26 33 43 19 22 55 29 295 -59 26 5 32 27 2 9 25 27 35 27 41 13 62 0 0 25 34 30 19 23 1 27 295 -61 25 6 35 26 2 39 24 28 59 26 41 19 63 0 0 24 35 52 19 23 7 26 296 -62 24 8 13 25 3 44 23 30 59 25 42 2 64 0 0 23 37 53 19 23 12 25 297 -63 23 10 31 24 5 29 22 33 37 24 43 23 65 0 0 22 40 36 19 23 17 24 297 -64 22 13 30 23 7 56 21 36 58 23 45 27 66 0 0 21 44 3 19 23 22 22 298 -65 21 17 13 22 11 6 20 41 2 22 48 15 67 0 0 20 48 17 19 23 27 21 298 -66 20 21 42 21 15 4 19 45 53 21 51 49 68 0 0 19 53 19 19 23 31 20 299 -67 19 27 0 20 19 50 18 51 32 20 56 12 69 0 0 18 59 12 19 23 35 18 299 -68 18 33 9 19 25 26 17 58 1 20 1 27 70 0 0 18 5 56 19 23 39 17 300 -69 17 40 9 18 31 55 17 5 22 19 7 33 71 0 0 17 13 35 19 23 42 16 300 -70 16 48 3 17 39 18 16 13 36 18 14 35 72 0 0 16 22 8 19 23 45 15 300 -71 15 56 51 16 47 36 15 22 45 17 22 31 73 0 0 15 31 38 19 23 48 13 301 -72 15 6 36 15 56 51 14 32 49 16 31 25 74 0 0 14 42 5 19 23 51 12 301 -72 14 17 17 15 7 3 13 43 50 15 41 16 75 0 0 13 53 30 19 23 53 11 301 -73 13 28 57 14 18 13 12 55 48 14 52 6 76 0 0 13 5 54 19 23 55 10 302 -73 12 41 35 13 30 23 12 8 45 14 3 56 77 0 0 12 19 18 19 23 57 8 302 -74 11 55 12 12 43 33 11 22 40 13 16 47 78 0 0 11 33 41 19 23 59 7 302 -74 11 9 49 11 57 43 10 37 35 12 30 38 79 0 0 10 49 5 19 24 0 6 302 -74 10 25 26 11 12 53 9 53 30 11 45 30 80 0 0 10 5 30 19 24 1 5 303 -74 9 42 4 10 29 5 9 10 24 11 1 23 81 0 0 9 22 56 19 24 2 3 303 -74 8 59 42 9 46 18 .. .. .. 10 18 19 82 0 0 8 41 23 19 24 3 2 303 -74 8 18 21 9 4 33 .. .. .. 9 36 16 83 0 0 8 0 51 19 24 3 1 303 -74 7 38 1 8 23 49 .. .. .. 8 55 16 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 12.0] Data for the target star ------------------------ * name: TYC 2441-01329-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 58 23.3546 DE: +32 49 28.333 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .021 ) * V mag [mag]: 12.7 * B mag [mag]: 12.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (255) Oppavia approx. diameter [km]: 57 approx. diameter ["]: .035 distance from Earth [AU]: 2.27100 * orbital information: orbit source: Preston date of fit: 2008 Mar 12 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 883 number of rejected observations: 72 time covered by the observations: 1904 Mar 15 - 2008 Mar 10 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.012, 96° remarks: * orbital elements for (255) Oppavia : Mean anomaly = 324.22587445 deg Arg. of pericenter = 152.95657894 deg Long. of node = 13.76270699 deg Inclination = 9.48382747 deg Eccentricity = 0.08008115 Semimajor axis = 2.74549418 AU Perihelion dist = 2.52563186 AU Mag: H = 10.21, G = 0.15 Epoch of elements : MJD 54551.80500000 TDT (2008 Mar 26.805) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 26 255 Oppavia 19h 18.0m UT 12.7 6 58 23.355 32 49 28.33TYC 2441-01329-1 12.6 15.3 57 4.0 2.271 2.263 -13.92 -9.5149 32.829 -108.14 2.58 19.3005 0.24916 0.51331 7.36611 -3.59477 0.00561 -0.00068 2000 323.8348082008 325.00000152.956579 13.762707 9.4838270.08008115 2.7454942 2.525631810.4 5.00.15 RATE 2.1665720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.024 0.024 93 1.68 0.024 0 54537.5020080326_1329-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 12, 23:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org