IOTA/IOTA-ES occultation update for (483) Seppina / TYC 4716-00332-1 event on 2008 Feb 03, 22:35 UT Visible from Brazil Summary ------- On 2008 Feb 03 UT, the 69 km diameter asteroid (483) Seppina will occult a 10.6 mag star in the constellation Taurus for observers along a path across Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 14.4 mag (the magnitude of the asteroid) for at most 5.0 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: 64 * date and approx. time of event: 2008 Feb 03, 22:28 - 2008 Feb 03, 22:42 UT * midpoint of event [JD]: 2454500.44117917 * magnitude of target star: 10.6 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 5.0 * Moon: 11 % sunlit, 130° distance * Sun: 96° distance * rough path description: Brazil The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 0.96 * 1 sigma uncertainty interval [seconds]: +/- 4.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .028", 359° ) * approx speed of asteroid's shadow [km/s]: 13.7893 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4716-00332-1 by 483 Seppina on 2008 Feb 03 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 ' " Longitude Longitude Longitude Longitude ... .. .. 19 0 0 .. .. .. .. .. .. ... .. .. ... .. .. ... .. .. 21 40 11 21 52 27 18 0 0 22 42 8 6 267 -88 26 31 55 19 3 57 ... .. .. 15 5 46 15 17 23 17 0 0 22 41 58 13 265 -83 17 13 12 13 35 3 22 10 3 10 43 25 Latitude Latitude Latitude Latitude 14 0 0 16 43 58 22 41 56 14 265 -81 16 22 25 17 5 27 15 40 49 17 46 30 13 0 0 16 30 32 22 41 53 15 264 -80 16 8 55 16 52 6 15 27 10 17 33 17 12 0 0 16 16 15 22 41 51 16 264 -79 15 54 32 16 37 53 15 12 39 17 19 13 11 0 0 16 1 4 22 41 48 17 264 -78 15 39 16 16 22 47 14 57 13 17 4 17 10 0 0 15 45 0 22 41 46 18 264 -77 15 23 7 16 6 48 14 40 53 16 48 28 9 0 0 15 28 1 22 41 43 19 264 -76 15 6 3 15 49 55 14 23 38 16 31 46 8 0 0 15 10 8 22 41 40 20 263 -75 14 48 4 15 32 8 14 5 27 16 14 10 7 0 0 14 51 20 22 41 36 21 263 -74 14 29 9 15 13 26 13 46 21 15 55 40 6 0 0 14 31 36 22 41 33 22 263 -73 14 9 19 14 53 49 13 26 17 15 36 14 5 0 0 14 10 55 22 41 29 23 263 -72 13 48 31 14 33 15 13 5 16 15 15 53 4 0 0 13 49 18 22 41 25 24 263 -71 13 26 46 14 11 44 12 43 17 14 54 36 3 0 0 13 26 42 22 41 21 25 263 -70 13 4 3 13 49 16 12 20 19 14 32 22 2 0 0 13 3 7 22 41 17 26 262 -69 12 40 20 13 25 49 11 56 21 14 9 9 1 0 0 12 38 33 22 41 13 27 262 -68 12 15 38 13 1 23 11 31 23 13 44 59 0 0 0 12 12 59 22 41 8 28 262 -67 11 49 56 12 35 57 11 5 24 13 19 49 - 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Data for the target star ------------------------ * name: TYC 4716-00332-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 31 31.0072 DE: -00 55 59.642 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .026 ) * V mag [mag]: 10.6 * B mag [mag]: 11.5 * Apparent position with proper motion RA(deg): 52.9860145065 DE(deg): -0.9053716031 * Equation of equinoxes (radians) : 0.000045551911220 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (483) Seppina approx. diameter [km]: 69 approx. diameter ["]: .030 distance from Earth [AU]: 3.21600 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 843 number of rejected observations: 91 time covered by the observations: 1902 Mar 07 - 2007 Nov 25 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.012, 87° remarks: * orbital elements for (483) Seppina : Mean anomaly = 95.77508163 deg Arg. of pericenter = 152.28452510 deg Long. of node = 174.12083159 deg Inclination = 18.73815348 deg Eccentricity = 0.05532247 Semimajor axis = 3.42468188 AU Perihelion dist = 3.23522001 AU Mag: H = 8.19, G = 0.15 Epoch of elements : MJD 54499.94100000 TDT (2008 Feb 03.941) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 03 483 Seppina 22h 35.3m UT 10.6 3 31 31.007- 0 55 59.64TYC 4716-00332-1 11.5 14.4 69 5.0 3.216 1.003 15.07 -59.428 -0.938 204.63 -16.49 22.5883 .31789 -.31884 5.49660 5.51032 0.00579 0.00175 2000 94.22910222008 125.00000152.284525174.120832 18.7381530.055322473.424681883.235220018.335 0.15 RATE 1.5551552 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.029 0.028 359.5 1.960 0.029 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 04, 01:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org