IOTA/IOTA-ES occultation update for (431) Nephele / TYC 5256-00319-1 event on 2007 Oct 03, 10:16 UT Visible from SE Australia Summary ------- On 2007 Oct 03 UT, the 95 km diameter asteroid (431) Nephele will occult a 11.5 mag star in the constellation Pisces for observers along a path across SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 12.3 mag (the magnitude of the asteroid) for at most 10.1 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: 99 * date and approx. time of event: 2007 Oct 03, 10:06 - 2007 Oct 03, 10:27 UT * midpoint of event [JD]: 2454376.92825 * magnitude of target star: 11.5 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 10.1 * Moon: 50 % sunlit, 102° distance * Sun: 168° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 100 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 5.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .026", 75° ) * approx speed of asteroid's shadow [km/s]: 9.4453 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5256-00319-1 by 431 Nephele on 2007 Oct 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 ' " Latitude Latitude Latitude Latitude 99 0 0 -42 31 11 10 27 19 1 94 11 -42 4 2 -42 58 24 -41 46 9 -43 16 24 100 0 0 -42 33 58 10 27 19 1 93 10 -42 6 50 -43 1 11 -41 48 58 -43 19 11 101 0 0 -42 36 26 10 27 18 2 92 10 -42 9 19 -43 3 38 -41 51 27 -43 21 38 102 0 0 -42 38 34 10 27 18 3 92 9 -42 11 27 -43 5 46 -41 53 36 -43 23 45 103 0 0 -42 40 23 10 27 17 3 91 8 -42 13 16 -43 7 34 -41 55 25 -43 25 33 104 0 0 -42 41 52 10 27 17 4 90 7 -42 14 45 -43 9 2 -41 56 54 -43 27 1 105 0 0 -42 43 1 10 27 16 5 90 7 -42 15 54 -43 10 11 -41 58 3 -43 28 10 106 0 0 -42 43 50 10 27 15 6 89 6 -42 16 44 -43 11 1 -41 58 53 -43 28 59 107 0 0 -42 44 20 10 27 14 6 88 5 -42 17 14 -43 11 31 -41 59 23 -43 29 29 108 0 0 -42 44 30 10 27 13 7 88 4 -42 17 24 -43 11 41 -41 59 33 -43 29 40 109 0 0 -42 44 21 10 27 12 8 87 4 -42 17 15 -43 11 32 -41 59 24 -43 29 31 110 0 0 -42 43 53 10 27 11 9 86 3 -42 16 46 -43 11 4 -41 58 55 -43 29 3 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44 10 6 2 0 267 -10 5 9 56 4 15 27 .. .. .. 3 57 24 Data for the target star ------------------------ * name: TYC 5256-00319-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 58 09.9573 DE: -03 04 54.061 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .019 ) * V mag [mag]: 11.5 * B mag [mag]: 12.4 * Apparent position with proper motion RA(deg): 359.6478049074 DE(deg): -3.0356334480 * Equation of equinoxes (radians) : 0.000029709020699 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (431) Nephele approx. diameter [km]: 95 approx. diameter ["]: .079 distance from Earth [AU]: 1.66600 * orbital information: orbit source: Preston date of fit: 2007 Aug 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 953 number of rejected observations: 122 time covered by the observations: 1902 Oct 07 - 2007 Jun 18 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.018, 68° remarks: * orbital elements for (431) Nephele : Mean anomaly = 22.55870546 deg Arg. of pericenter = 213.37959167 deg Long. of node = 117.29003118 deg Inclination = 1.82730220 deg Eccentricity = 0.17251700 Semimajor axis = 3.13563099 AU Perihelion dist = 2.59468135 AU Mag: H = 8.78, G = 0.15 Epoch of elements : MJD 54376.42800000 TDT (2007 Oct 03.428) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 03 431 Nephele 10h 16.7m UT 11.5 23 58 9.957- 3 4 54.06TYC 5256-00319-1 12.4 12.3 95 10.1 1.666 -1.722 -11.22 193.629 -3.079 23.13 -3.90 10.2780 .12851 -.29590 -4.88842 -2.12717 0.00090 0.00067 2000 21.41768692007 927.00000213.379592117.290031 1.8273020.172517003.135630992.594681358.725 0.15 RATE 1.7750748 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.040 0.026 75.2 1.330 0.026 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 03, 05:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org