IOTA/IOTA-ES occultation update for (516) Amherstia / TYC 7362-00083-1 event on 2007 Nov 04, 19:08 UT Visible from Africa Summary ------- On 2007 Nov 04 UT, the 73 km diameter asteroid (516) Amherstia will occult a 11.3 mag star in the constellation Scorpius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.0 mag (the magnitude of the asteroid) for at most 1.6 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: 74 * date and approx. time of event: 2007 Nov 04, 19:06 - 2007 Nov 04, 19:10 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 1.6 * Moon: 22 % sunlit, 95° distance * Sun: 39° distance * rough path description: Africa Additional comments ------------------- low altitude The occultation path -------------------- * approximate projected width [km]: 76 * 1 sigma uncertainty interval [path widths]: +/- 0.77 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .025", 360° ) * approx speed of asteroid's shadow [km/s]: 46.3229 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7362-00083-1 by 516 Amherstia 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 ' " Latitude Latitude Latitude Latitude -169 0 0 -14 7 17 19 6 5 0 122 34 -14 31 27 -13 43 10 -15 8 47 .. .. .. -168 0 0 -14 43 36 19 6 5 2 121 35 -15 7 47 -14 19 28 -15 45 8 .. .. .. -167 0 0 -15 19 54 19 6 5 3 121 36 -15 44 6 -14 55 45 -16 21 28 -14 18 41 -166 0 0 -15 56 10 19 6 6 4 121 37 -16 20 22 -15 32 0 -16 57 45 -14 54 55 -165 0 0 -16 32 21 19 6 6 5 121 38 -16 56 34 -16 8 12 -17 33 58 -15 31 6 -164 0 0 -17 8 28 19 6 6 6 120 39 -17 32 41 -16 44 19 -18 10 6 -16 7 12 -163 0 0 -17 44 29 19 6 6 7 120 40 -18 8 43 -17 20 20 -18 46 7 -16 43 13 -162 0 0 -18 20 23 19 6 7 8 120 41 -18 44 36 -17 56 14 -19 22 0 -17 19 7 -161 0 0 -18 56 9 19 6 7 10 119 42 -19 20 21 -18 31 59 -19 57 45 -17 54 53 -160 0 0 -19 31 45 19 6 8 11 119 43 -19 55 57 -19 7 36 -20 33 20 -18 30 31 -159 0 0 -20 7 11 19 6 8 12 119 44 -20 31 22 -19 43 2 -21 8 44 -19 5 58 -158 0 0 -20 42 25 19 6 9 13 118 45 -21 6 35 -20 18 17 -21 43 56 -19 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Data for the target star ------------------------ * name: TYC 7362-00083-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 16 00.9121 DE: -30 44 47.789 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .027 ) * V mag [mag]: 11.3 * B mag [mag]: 12.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (516) Amherstia approx. diameter [km]: 73 approx. diameter ["]: .036 distance from Earth [AU]: 2.77900 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 706 number of rejected observations: 101 time covered by the observations: 1903 Nov 14 - 2007 May 23 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.007, 89° remarks: * orbital elements for (516) Amherstia : Mean anomaly = 28.78129694 deg Arg. of pericenter = 258.53884541 deg Long. of node = 328.87015258 deg Inclination = 12.95735819 deg Eccentricity = 0.27381809 Semimajor axis = 2.68041314 AU Perihelion dist = 1.94646754 AU Mag: H = 8.17, G = 0.15 Epoch of elements : MJD 54408.79700000 TDT (2007 Nov 04.797) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 04 516 Amherstia 19h 8.3m UT 11.3 17 16 0.912-30 44 47.79TYC 7362-00083-1 12.1 13.0 73 1.6 2.779 6.417 1.75 -71.721 -30.747 -111.18 -15.43 19.1384 .00494 -.25664 26.14015 0.55020 0.00340 -0.00083 2000 26.805528520071027.00000258.538845328.870153 12.9573580.273818092.680413141.946467548.275 0.15 RATE 2.2459571 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.028 0.025 359.9 1.770 0.028 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org