IOTA/IOTA-ES occultation update for (483) Seppina / TYC 4725-01024-1 event on 2007 Nov 04, 01:52 UT Visible from S Africa Summary ------- On 2007 Nov 04 UT, the 69 km diameter asteroid (483) Seppina will occult a 12.2 mag star in the constellation Eridanus for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 13.5 mag (the magnitude of the asteroid) for at most 4.9 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: 79 * date and approx. time of event: 2007 Nov 04, 01:46 - 2007 Nov 04, 01:57 UT * magnitude of target star: 12.2 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 4.9 * Moon: 28 % sunlit, 99° distance * Sun: 152° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 98 * 1 sigma uncertainty interval [path widths]: +/- 0.69 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .025", 87° ) * approx speed of asteroid's shadow [km/s]: 14.0213 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4725-01024-1 by 483 Seppina on 2007 Nov 04 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 ... .. .. -11 0 0 .. .. .. .. .. .. ... .. .. ... .. .. 73 18 20 ... .. .. 73 39 57 -12 0 0 1 46 33 8 269 17 70 53 41 77 28 50 67 48 34 ... .. .. 68 6 22 -13 0 0 1 46 44 13 271 12 66 8 35 70 20 4 63 43 48 74 10 22 Latitude Latitude Latitude Latitude 67 0 0 -13 14 54 1 46 47 14 271 11 -12 47 51 -13 42 11 -12 10 52 -14 20 12 66 0 0 -13 29 13 1 46 50 15 271 10 -13 2 5 -13 56 35 -12 24 59 -14 34 43 65 0 0 -13 44 21 1 46 53 16 272 9 -13 17 7 -14 11 47 -12 39 55 -14 50 3 64 0 0 -14 0 16 1 46 56 17 272 8 -13 32 57 -14 27 48 -12 55 37 -15 6 11 63 0 0 -14 16 59 1 46 59 18 272 7 -13 49 35 -14 44 37 -13 12 7 -15 23 9 62 0 0 -14 34 31 1 47 3 19 273 6 -14 7 0 -15 2 15 -13 29 24 -15 40 55 61 0 0 -14 52 50 1 47 6 20 273 6 -14 25 13 -15 20 40 -13 47 29 -15 59 30 60 0 0 -15 11 57 1 47 10 21 274 5 -14 44 13 -15 39 54 -14 6 20 -16 18 54 59 0 0 -15 31 51 1 47 14 22 274 4 -15 4 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42 46 .. .. .. -80 19 54 - 92 0 0 -79 17 12 1 57 5 4 81 9 -78 50 47 -79 43 49 .. .. .. -80 20 54 - 93 0 0 -79 18 7 1 57 6 4 82 10 -78 51 44 -79 44 43 .. .. .. -80 21 45 - 94 0 0 -79 18 54 1 57 6 3 83 10 -78 52 32 -79 45 27 .. .. .. -80 22 28 - 95 0 0 -79 19 31 1 57 6 3 84 10 -78 53 11 -79 46 3 .. .. .. -80 23 2 - 96 0 0 -79 19 59 1 57 6 3 85 10 -78 53 40 -79 46 30 .. .. .. -80 23 27 - 97 0 0 -79 20 17 1 57 6 3 86 10 -78 53 59 -79 46 48 .. .. .. -80 23 44 - 98 0 0 -79 20 27 1 57 6 3 87 10 -78 54 9 -79 46 57 .. .. .. -80 23 52 - 99 0 0 -79 20 27 1 57 6 3 88 11 -78 54 9 -79 46 57 .. .. .. -80 23 52 -100 0 0 -79 20 17 1 57 6 2 89 11 -78 53 59 -79 46 48 .. .. .. -80 23 43 -101 0 0 -79 19 59 1 57 6 2 90 11 -78 53 41 -79 46 30 .. .. .. -80 23 26 -102 0 0 -79 19 31 1 57 6 2 91 11 -78 53 12 -79 46 3 .. .. .. -80 23 1 -103 0 0 -79 18 54 1 57 7 2 92 11 -78 52 34 -79 45 27 .. .. .. -80 22 26 -104 0 0 -79 18 8 1 57 7 2 93 11 -78 51 46 -79 44 42 .. .. .. -80 21 44 -105 0 0 -79 17 12 1 57 7 1 94 12 -78 50 49 -79 43 48 .. .. .. -80 20 52 -106 0 0 -79 16 7 1 57 7 1 95 12 -78 49 42 -79 42 45 .. .. .. -80 19 52 -107 0 0 -79 14 53 1 57 7 1 96 12 -78 48 25 -79 41 33 .. .. .. -80 18 43 -108 0 0 -79 13 28 1 57 7 1 97 12 -78 46 58 -79 40 12 .. .. .. -80 17 25 -109 0 0 -79 11 55 1 57 7 1 98 12 -78 45 21 -79 38 41 .. .. .. -80 15 59 -110 0 0 -79 10 11 1 57 7 0 99 12 -78 43 34 -79 37 0 .. .. .. -80 14 23 -111 0 0 -79 8 17 1 57 7 0 100 13 -78 41 37 -79 35 11 .. .. .. -80 12 39 -112 0 0 -79 6 14 1 57 7 0 101 13 -78 39 30 -79 33 11 .. .. .. -80 10 45 -113 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -80 8 42 Data for the target star ------------------------ * name: TYC 4725-01024-1 * constellation : Eridanus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 01 55.5849 DE: -02 07 32.183 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 12.2 * B mag [mag]: 12.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (483) Seppina approx. diameter [km]: 69 approx. diameter ["]: .038 distance from Earth [AU]: 2.49700 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 801 number of rejected observations: 91 time covered by the observations: 1902 Mar 07 - 2007 Oct 20 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.016, 85° remarks: * orbital elements for (483) Seppina : Mean anomaly = 81.53659681 deg Arg. of pericenter = 152.23741585 deg Long. of node = 174.12409813 deg Inclination = 18.73857987 deg Eccentricity = 0.05528892 Semimajor axis = 3.42453551 AU Perihelion dist = 3.23519662 AU Mag: H = 8.20, G = 0.15 Epoch of elements : MJD 54408.07800000 TDT (2007 Nov 04.078) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 04 483 Seppina 1h 51.8m UT 12.2 4 1 55.585- 2 7 32.18TYC 4725-01024-1 12.5 13.5 69 4.9 2.497 -1.544 -15.54 -10.406 -2.122 147.95 -15.21 1.8633 .39549 -.58807 -6.56873 -4.41398 -0.00217 0.00176 2000 80.280262120071027.00000152.237416174.124098 18.7385800.055288923.424535513.235196628.335 0.15 RATE 1.5552548 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.030 0.025 87.1 1.690 0.026 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org