IOTA/IOTA-ES occultation update for (329) Svea / TYC 4741-00096-1 event on 2008 Jan 01, 23:53 UT Visible from Brazil, Bolivia Summary ------- On 2008 Jan 01 UT, the 78 km diameter asteroid (329) Svea will occult a 11.9 mag star in the constellation Orion for observers along a path across Brazil, Bolivia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.6 mag (the magnitude of the asteroid) for at most 8.4 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: 97 * date and approx. time of event: 2008 Jan 01, 23:43 - 2008 Jan 02, 00:03 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 8.4 * Moon: 35 % sunlit, 129° distance * Sun: 143° distance * rough path description: Brazil, Bolivia Additional comments ------------------- 18" double star The occultation path -------------------- * approximate projected width [km]: 86 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .023", 89° ) * approx speed of asteroid's shadow [km/s]: 9.3194 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4741-00096-1 by 329 Svea on 2008 Jan 01 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 -118 0 0 - 6 10 21 24 3 47 0 92 28 - 5 47 5 - 6 33 42 .. .. .. - 6 52 25 -117 0 0 - 6 12 43 24 3 47 1 92 27 - 5 49 27 - 6 36 4 .. .. .. - 6 54 47 -116 0 0 - 6 15 27 24 3 46 2 92 26 - 5 52 10 - 6 38 48 .. .. .. - 6 57 31 -115 0 0 - 6 18 32 24 3 45 3 92 25 - 5 55 16 - 6 41 53 - 5 36 41 - 7 0 37 -114 0 0 - 6 21 59 24 3 45 4 91 24 - 5 58 42 - 6 45 21 - 5 40 8 - 7 4 5 -113 0 0 - 6 25 48 24 3 43 5 91 24 - 6 2 31 - 6 49 10 - 5 43 56 - 7 7 55 -112 0 0 - 6 29 59 24 3 42 6 91 23 - 6 6 41 - 6 53 21 - 5 48 6 - 7 12 6 -111 0 0 - 6 34 30 24 3 40 7 91 22 - 6 11 12 - 6 57 53 - 5 52 36 - 7 16 38 -110 0 0 - 6 39 23 24 3 39 8 91 21 - 6 16 4 - 7 2 46 - 5 57 28 - 7 21 32 -109 0 0 - 6 44 37 24 3 37 9 91 20 - 6 21 18 - 7 8 1 - 6 2 41 - 7 26 47 -108 0 0 - 6 50 12 24 3 34 10 91 19 - 6 26 52 - 7 13 36 - 6 8 15 - 7 32 23 -107 0 0 - 6 56 8 24 3 32 11 91 18 - 6 32 47 - 7 19 33 - 6 14 10 - 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19 11 278 -10 -43 7 1 -43 53 35 -42 48 28 -44 12 17 54 0 0 -43 32 19 23 43 18 11 278 -10 -43 9 5 -43 55 38 -42 50 33 -44 14 20 55 0 0 -43 34 7 23 43 16 10 277 -9 -43 10 54 -43 57 25 -42 52 22 -44 16 7 56 0 0 -43 35 39 23 43 14 9 276 -9 -43 12 26 -43 58 57 -42 53 54 -44 17 38 57 0 0 -43 36 55 23 43 13 8 275 -8 -43 13 42 -44 0 12 -42 55 11 -44 18 53 58 0 0 -43 37 55 23 43 12 8 275 -8 -43 14 43 -44 1 12 -42 56 12 -44 19 53 59 0 0 -43 38 40 23 43 10 7 274 -7 -43 15 27 -44 1 56 -42 56 57 -44 20 37 60 0 0 -43 39 8 23 43 9 6 273 -7 -43 15 56 -44 2 24 -42 57 25 -44 21 5 61 0 0 -43 39 20 23 43 8 6 273 -6 -43 16 8 -44 2 36 -42 57 38 -44 21 17 62 0 0 -43 39 17 23 43 7 5 272 -6 -43 16 5 -44 2 33 -42 57 34 -44 21 13 63 0 0 -43 38 57 23 43 7 4 271 -5 -43 15 45 -44 2 13 -42 57 15 -44 20 53 64 0 0 -43 38 21 23 43 6 3 271 -4 -43 15 9 -44 1 37 -42 56 39 -44 20 17 65 0 0 -43 37 29 23 43 6 3 270 -4 -43 14 18 -44 0 45 -42 55 47 -44 19 25 66 0 0 -43 36 21 23 43 5 2 269 -3 -43 13 10 -43 59 37 -42 54 39 -44 18 18 67 0 0 -43 34 57 23 43 5 1 269 -3 -43 11 45 -43 58 14 -42 53 15 -44 16 54 68 0 0 -43 33 17 23 43 5 1 268 -2 -43 10 5 -43 56 34 -42 51 34 -44 15 14 Data for the target star ------------------------ * name: TYC 4741-00096-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 54 17.5901 DE: -01 54 48.552 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .020 ) * V mag [mag]: 11.9 * B mag [mag]: 12.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (329) Svea approx. diameter [km]: 78 approx. diameter ["]: .064 distance from Earth [AU]: 1.67100 * orbital information: orbit source: Preston date of fit: 2007 Dec 18 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 885 number of rejected observations: 95 time covered by the observations: 1905 Sep 19 - 2007 Dec 15 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.013, 88° remarks: * orbital elements for (329) Svea : Mean anomaly = 213.66091271 deg Arg. of pericenter = 52.67636591 deg Long. of node = 178.53792916 deg Inclination = 15.88187144 deg Eccentricity = 0.02363906 Semimajor axis = 2.47713027 AU Perihelion dist = 2.41857324 AU Mag: H = 9.48, G = 0.15 Epoch of elements : MJD 54466.99500000 TDT (2008 Jan 01.995) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 01 329 Svea 23h 53.4m UT 11.9 4 54 17.590- 1 54 48.55TYC 4741-00096-1 12.6 13.6 78 8.4 1.671 -1.749 8.84 -25.791 -1.917 182.54 -22.99 23.8903 -.13340 -.39648 -4.98523 1.67825 0.00253 0.00246 2000 211.89256120071226.00000 52.676366178.537929 15.8818710.023639062.477130272.418573249.665 0.15 RATE 2.5280220 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.038 0.023 89.3 1.400 0.026 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 19, 03:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org