IOTA/IOTA-ES occultation update for (366) Vincentina / UCAC2 42749694 event on 2009 Feb 03, 06:26 UT Visible from Summary ------- On 2009 Feb 03 UT, the 94 km diameter asteroid (366) Vincentina will occult a 11.9 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.8 mag to 13.5 mag (the magnitude of the asteroid) for at most 7.0 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: 94 * date and approx. time of event: 2009 Feb 03, 06:18 - 2009 Feb 03, 06:34 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 1.8 * estimated maximum duration [s]: 7.0 * Moon: 54 % sunlit, 67° distance * Sun: 159° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 94 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .025", 101° ) * approx speed of asteroid's shadow [km/s]: 13.4733 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 42749694 by 366 Vincentina on 2009 Feb 3 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 174 0 0 3 16 14 6 34 23 15 58 0 3 45 56 2 46 31 4 13 14 2 19 10 175 0 0 3 51 56 6 34 20 16 59 -1 4 21 35 3 22 15 4 48 51 2 54 57 176 0 0 4 27 25 6 34 17 17 59 -2 4 57 1 3 57 47 5 24 15 3 30 30 177 0 0 5 2 40 6 34 15 18 59 -3 5 32 15 4 33 5 5 59 26 4 5 51 178 0 0 5 37 42 6 34 11 20 59 -5 6 7 13 5 8 10 6 34 22 4 40 58 179 0 0 6 12 28 6 34 8 21 59 -6 6 41 56 5 42 59 7 9 2 5 15 50 180 0 0 6 46 58 6 34 5 22 59 -7 7 16 23 6 17 32 7 43 26 5 50 26 -179 0 0 7 21 11 6 34 1 23 59 -8 7 50 33 6 51 48 8 17 33 6 24 45 -178 0 0 7 55 6 6 33 58 24 59 -9 8 24 24 7 25 46 8 51 22 6 58 46 -177 0 0 8 28 42 6 33 54 25 59 -10 8 57 57 7 59 26 9 24 52 7 32 29 -176 0 0 9 1 59 6 33 50 26 59 -11 9 31 11 8 32 46 9 58 2 8 5 53 -175 0 0 9 34 56 6 33 45 27 60 -12 10 4 4 9 5 47 10 30 51 8 38 57 -174 0 0 10 7 32 6 33 41 29 60 -13 10 36 36 9 38 26 11 3 20 9 11 40 -173 0 0 10 39 46 6 33 37 30 60 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51 - 45 0 0 16 4 34 6 20 1 31 297 -45 16 32 50 15 36 17 16 58 49 15 10 16 - 44 0 0 15 36 39 6 19 56 30 297 -44 16 5 0 15 8 18 16 31 3 14 42 12 - 43 0 0 15 8 18 6 19 52 29 298 -43 15 36 42 14 39 52 16 2 50 14 13 42 - 42 0 0 14 39 29 6 19 48 28 298 -42 15 7 58 14 10 59 15 34 10 13 44 44 - 41 0 0 14 10 14 6 19 44 27 298 -41 14 38 48 13 41 39 15 5 4 13 15 21 - 40 0 0 13 40 32 6 19 40 26 298 -40 14 9 11 13 11 53 14 35 31 12 45 31 - 39 0 0 13 10 25 6 19 36 25 299 -39 13 39 8 12 41 42 14 5 32 12 15 15 - 38 0 0 12 39 53 6 19 32 24 299 -38 13 8 40 12 11 5 13 35 8 11 44 34 - 37 0 0 12 8 56 6 19 29 23 299 -37 12 37 47 11 40 4 13 4 19 11 13 29 - 36 0 0 11 37 34 6 19 25 21 299 -36 12 6 30 11 8 38 12 33 6 10 42 0 - 35 0 0 11 5 49 6 19 22 20 299 -35 11 34 49 10 36 49 12 1 29 10 10 7 - 34 0 0 10 33 41 6 19 19 19 300 -34 11 2 45 10 4 37 11 29 28 9 37 51 - 33 0 0 10 1 11 6 19 16 18 300 -33 10 30 18 9 32 2 10 57 5 9 5 12 - 32 0 0 9 28 18 6 19 13 17 300 -32 9 57 30 8 59 6 10 24 20 8 32 12 - 31 0 0 8 55 4 6 19 11 16 300 -31 9 24 20 8 25 48 9 51 14 7 58 52 - 30 0 0 8 21 30 6 19 8 15 300 -30 8 50 49 7 52 10 9 17 47 7 25 10 - 29 0 0 7 47 37 6 19 6 14 300 -29 8 16 59 7 18 13 8 44 0 6 51 10 - 28 0 0 7 13 24 6 19 4 12 301 -28 7 42 50 6 43 57 8 9 54 6 16 51 - 27 0 0 6 38 53 6 19 2 11 301 -26 7 8 22 6 9 23 7 35 29 5 42 14 - 26 0 0 6 4 5 6 19 0 10 301 -25 6 33 38 5 34 32 7 0 47 5 7 20 - 25 0 0 5 29 1 6 18 59 9 301 -24 5 58 36 4 59 25 6 25 49 4 32 10 - 24 0 0 4 53 42 6 18 57 8 301 -23 5 23 20 4 24 3 5 50 35 3 56 45 - 23 0 0 4 18 8 6 18 56 7 301 -22 4 47 48 3 48 26 5 15 6 3 21 6 - 22 0 0 3 42 20 6 18 55 6 301 -21 4 12 3 3 12 36 4 39 23 2 45 14 - 21 0 0 3 6 20 6 18 54 4 301 -20 3 36 6 2 36 34 4 3 28 2 9 9 - 20 0 0 2 30 9 6 18 54 3 301 -19 2 59 57 2 0 20 3 27 21 1 32 54 - 19 0 0 1 53 47 6 18 53 2 301 -18 2 23 37 1 23 57 2 51 3 0 56 28 - 18 0 0 1 17 17 6 18 53 1 301 -16 1 47 8 0 47 24 2 14 35 0 19 54 Uncertainty in time = +/- 4 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: UCAC2 42749694 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 01 44.8703 DE: +31 17 50.109 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (366) Vincentina approx. diameter [km]: 94 approx. diameter ["]: .055 distance from Earth [AU]: 2.37800 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 875 number of rejected observations: 82 time covered by the observations: 1900 Aug 03 - 2008 Apr 07 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.017, 108° remarks: * orbital elements for (366) Vincentina : Mean anomaly = 167.71624837 deg Arg. of pericenter = 325.08951879 deg Long. of node = 346.97634905 deg Inclination = 10.55289016 deg Eccentricity = 0.05527861 Semimajor axis = 3.14627318 AU Perihelion dist = 2.97235157 AU Mag: H = 8.50, G = 0.15 Epoch of elements : MJD 54865.26900000 TDT (2009 Feb 03.269) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 3 366 Vincentina 6h 26.8m UT 11.9 8 1 44.870 31 17 50.11UCAC2 42749694 0.0 13.5 94 7.0 2.378 -2.190 -1.54 -109.8260 31.298 86.77 -16.46 6.4461 0.00169 -0.03814 -7.59342 -0.41454 0.00167 -0.00143 2000 166.7857022009 129.00000325.089519346.976349 10.5528900.05527861 3.1462732 2.9723516 8.5 5.00.15 RATE 1.7660770 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.025 101 1.46 0.025 0 54776.5020090203_749694 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 04:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org