IOTA/IOTA-ES occultation update for (366) Vincentina / TYC 1931-01394-1 event on 2009 May 09, 20:09 UT Visible from Summary ------- On 2009 May 09 UT, the 94 km diameter asteroid (366) Vincentina will occult a 11.8 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 14.7 mag (the magnitude of the asteroid) for at most 3.8 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: 81 * date and approx. time of event: 2009 May 09, 20:09 - 2009 May 09, 20:11 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 3.8 * Moon: 99 % sunlit, 117° distance * Sun: 71° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 146 * 1 sigma uncertainty interval [path widths]: +/- 0.66 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .023", 5° ) * approx speed of asteroid's shadow [km/s]: 24.8827 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1931-01394-1 by 366 Vincentina on 2009 May 9 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 4 31 20 62 28 15 20 9 12 40 247 0 5 49 10 62 45 37 3 16 7 62 10 24 7 36 2 63 7 44 1 40 36 61 46 9 5 32 16 61 39 35 20 9 16 39 248 -1 6 48 43 61 56 25 4 18 17 61 22 16 8 33 35 62 17 49 2 44 13 60 58 44 6 32 11 60 50 52 20 9 21 39 250 -2 7 47 22 61 7 10 5 19 22 60 34 5 9 30 21 61 27 52 3 46 41 60 11 14 7 31 15 60 2 5 20 9 25 39 252 -3 8 45 14 60 17 53 6 19 31 59 45 49 10 26 29 60 37 54 4 48 8 59 23 39 8 29 35 59 13 14 20 9 29 39 253 -4 9 42 28 59 28 30 7 18 52 58 57 28 11 22 5 59 47 51 5 48 42 58 35 57 9 27 20 58 24 16 20 9 33 39 255 -5 10 39 10 58 39 2 8 17 34 58 8 59 12 17 18 58 57 42 6 48 32 57 48 8 10 24 36 57 35 10 20 9 37 38 256 -6 11 35 29 57 49 26 9 15 43 57 20 23 13 12 14 58 7 26 7 47 44 57 0 10 11 21 30 56 45 54 20 9 42 38 258 -7 12 31 30 56 59 41 10 13 26 56 31 37 14 7 0 57 17 2 8 46 26 56 12 2 12 18 9 55 56 28 20 9 46 38 259 -8 13 27 21 56 9 45 11 10 50 55 42 40 15 1 41 56 26 26 9 44 45 55 23 43 13 14 40 55 6 49 20 9 50 37 261 -9 14 23 7 55 19 36 12 8 2 54 53 30 15 56 24 55 35 37 10 42 46 54 35 11 14 11 7 54 16 55 20 9 54 37 262 -10 15 18 55 54 29 13 13 5 7 54 4 6 16 51 15 54 44 34 11 40 36 53 46 25 15 7 39 53 26 45 20 9 58 36 264 -11 16 14 51 53 38 33 14 2 11 53 14 25 17 46 20 53 53 13 12 38 22 52 57 23 16 4 20 52 36 17 20 10 3 36 265 -12 17 11 1 52 47 34 14 59 22 52 24 26 18 41 46 53 1 33 13 36 9 52 8 2 17 1 18 51 45 27 20 10 7 35 267 -13 18 7 32 51 56 13 15 56 45 51 34 7 19 37 40 52 9 30 14 34 3 51 18 22 17 58 38 50 54 14 20 10 11 35 268 -14 19 4 30 51 4 28 16 54 27 50 43 25 20 34 7 51 17 2 15 32 11 50 28 19 18 56 29 50 2 34 20 10 15 34 269 -15 20 2 3 50 12 16 17 52 35 49 52 17 21 31 16 50 24 5 16 30 40 49 37 52 19 54 57 49 10 26 20 10 19 34 271 -16 21 0 18 49 19 34 18 51 16 49 0 41 22 29 14 49 30 37 17 29 37 48 46 57 20 54 11 48 17 44 20 10 24 33 272 -17 21 59 24 48 26 17 19 50 37 48 8 33 23 28 11 48 36 32 18 29 8 47 55 33 21 54 18 47 24 26 20 10 28 32 273 -18 22 59 30 47 32 23 20 50 47 47 15 51 24 28 15 47 41 47 19 29 22 47 3 34 22 55 28 46 30 27 20 10 32 31 275 -19 24 0 45 46 37 45 21 51 54 46 22 29 25 29 39 46 46 16 20 30 27 46 10 58 23 57 53 45 35 43 20 10 36 31 276 -20 25 3 21 45 42 20 22 54 10 45 28 23 26 32 33 45 49 53 21 32 33 45 17 41 25 1 44 44 40 6 20 10 40 30 277 -22 26 7 30 44 45 59 23 57 44 44 33 27 27 37 13 44 52 31 22 35 50 44 23 38 26 7 15 43 43 31 20 10 45 29 278 -23 27 13 29 43 48 37 25 2 51 43 37 37 28 43 55 43 54 2 23 40 29 43 28 42 27 14 43 42 45 50 20 10 49 28 280 -24 28 21 35 42 50 5 26 9 45 42 40 44 29 53 0 42 54 16 24 46 45 42 32 49 28 24 26 41 46 52 20 10 53 27 281 -25 29 32 8 41 50 11 27 18 44 41 42 39 31 4 51 41 53 0 25 54 54 41 35 49 29 36 48 40 46 28 20 10 57 26 282 -27 30 45 36 40 48 43 28 30 9 40 43 13 32 20 1 40 49 59 27 5 13 40 37 34 30 52 19 39 44 21 20 11 1 24 283 -28 32 2 31 39 45 24 29 44 27 39 42 13 33 39 7 39 44 55 28 18 7 39 37 53 32 11 35 38 40 15 20 11 6 23 284 -30 33 23 35 38 39 55 31 2 9 38 39 22 35 3 2 38 37 20 29 34 2 38 36 32 33 35 24 37 33 45 20 11 10 22 286 -31 34 49 45 37 31 46 32 23 57 37 34 20 36 32 56 37 26 41 30 53 35 37 33 13 35 4 52 36 24 18 20 11 14 20 287 -33 36 22 18 36 20 19 33 50 47 36 26 39 38 10 31 36 12 6 32 17 30 36 27 34 36 41 30 35 11 11 20 11 18 19 288 -34 38 3 8 35 4 39 35 23 56 35 15 42 39 58 21 34 52 19 33 46 50 35 19 5 38 27 36 33 53 13 20 11 23 17 289 -36 39 55 10 33 43 18 37 5 13 34 0 35 42 0 47 33 25 13 35 23 0 34 7 4 40 26 56 32 28 36 20 11 27 15 291 -38 42 3 33 32 13 46 38 57 32 32 39 51 44 26 15 31 46 39 37 8 8 32 50 27 42 46 26 30 53 55 20 11 31 12 292 -40 44 38 45 30 30 55 41 5 48 31 11 8 47 36 18 29 46 6 39 5 35 31 27 36 45 42 9 29 1 20 20 11 35 9 294 -42 48 11 10 28 19 58 43 39 57 29 29 33 54 18 25 26 2 18 41 21 27 29 55 33 50 21 19 26 18 17 20 11 39 4 296 -46 ... .. .. .. .. .. 47 7 50 27 21 35 ... .. .. .. .. .. 44 8 56 28 7 51 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 1931-01394-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 12 51.7983 DE: +25 08 39.199 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .022 ) * V mag [mag]: 11.8 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (366) Vincentina approx. diameter [km]: 94 approx. diameter ["]: .037 distance from Earth [AU]: 3.51200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 839 number of rejected observations: 82 time covered by the observations: 1900 Aug 03 - 2008 Feb 06 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.012, 112° remarks: * orbital elements for (366) Vincentina : Mean anomaly = 184.52974773 deg Arg. of pericenter = 325.14975580 deg Long. of node = 346.97447146 deg Inclination = 10.55333714 deg Eccentricity = 0.05529173 Semimajor axis = 3.14624296 AU Perihelion dist = 2.97228174 AU Mag: H = 8.48, G = 0.15 Epoch of elements : MJD 54960.84000000 TDT (2009 May 09.840) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 9 366 Vincentina 20h 8.9m UT 11.8 8 12 51.798 25 8 39.20TYC 1931-01394-1 12.3 14.7 94 3.8 3.512 2.379 -13.88 -46.7852 25.149 -123.12 17.56 20.1487 0.30104 0.70241 12.90324 -5.54557 0.00530 -0.00101 2000 184.3813952009 5 9.00000325.149756346.974471 10.5533370.05529173 3.1462430 2.9722817 8.5 5.00.15 RATE 1.7661020 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.025 0.023 5 1.66 0.024 0 54545.5020090509_1394-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org