IOTA/IOTA-ES occultation update for (1187) Afra / HIP 53697 event on 2007 Nov 03, 06:18 UT Visible from NE Brazil Summary ------- On 2007 Nov 03 UT, the 32 km diameter asteroid (1187) Afra will occult a 8.4 mag star in the constellation Leo for observers along a path across NE Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.4 mag to 16.8 mag (the magnitude of the asteroid) for at most 1.0 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: . The event at a glimpse ---------------------- * Rank: 41 * date and approx. time of event: 2007 Nov 03, 06:16 - 2007 Nov 03, 06:21 UT * magnitude of target star: 8.4 * magnitude drop [mag]: 8.4 * estimated maximum duration [s]: 1.0 * Moon: 36 % sunlit, 17° distance * Sun: 57° distance * rough path description: NE Brazil The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 1.58 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .022", 112° ) * approx speed of asteroid's shadow [km/s]: 31.5030 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 53697 by 1187 Afra on 2007 Nov 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 - 59 0 0 -16 33 59 6 16 37 0 83 -40 -16 46 22 .. .. .. -17 25 48 .. .. .. - 58 0 0 -16 27 15 6 16 37 1 82 -39 -16 39 37 -16 14 56 -17 19 0 .. .. .. - 57 0 0 -16 21 13 6 16 37 2 82 -39 -16 33 35 -16 8 55 -17 12 55 .. .. .. - 56 0 0 -16 15 53 6 16 37 3 82 -38 -16 28 14 -16 3 35 -17 7 32 .. .. .. - 55 0 0 -16 11 15 6 16 37 4 82 -37 -16 23 35 -15 58 58 -17 2 51 .. .. .. - 54 0 0 -16 7 19 6 16 38 5 81 -36 -16 19 38 -15 55 2 -16 58 52 .. .. .. - 53 0 0 -16 4 4 6 16 38 6 81 -36 -16 16 23 -15 51 48 -16 55 36 -15 13 18 - 52 0 0 -16 1 32 6 16 39 7 81 -35 -16 13 51 -15 49 16 -16 53 3 -15 10 47 - 51 0 0 -15 59 41 6 16 40 8 80 -34 -16 12 0 -15 47 26 -16 51 11 -15 8 57 - 50 0 0 -15 58 33 6 16 40 9 80 -33 -16 10 51 -15 46 17 -16 50 3 -15 7 49 - 49 0 0 -15 58 7 6 16 41 10 80 -32 -16 10 25 -15 45 51 -16 49 36 -15 7 23 - 48 0 0 -15 58 23 6 16 42 11 80 -32 -16 10 41 -15 46 7 -16 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Data for the target star ------------------------ * name: HIP 53697 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 59 10.2479 DE: +06 55 51.071 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .018, .015 ) * V mag [mag]: 8.4 * B mag [mag]: 8.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1187) Afra approx. diameter [km]: 32 approx. diameter ["]: .014 distance from Earth [AU]: 3.05000 * orbital information: orbit source: Preston date of fit: 2007 Oct 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 479 number of rejected observations: 43 time covered by the observations: 1929 Dec 06 - 2007 Mar 12 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.017, 124° remarks: * orbital elements for (1187) Afra : Mean anomaly = 77.66139927 deg Arg. of pericenter = 74.28223951 deg Long. of node = 327.46512200 deg Inclination = 10.72552275 deg Eccentricity = 0.22195257 Semimajor axis = 2.63995027 AU Perihelion dist = 2.05400652 AU Mag: H = 11.42, G = 0.15 Epoch of elements : MJD 54407.26300000 TDT (2007 Nov 03.263) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Nov 03 1187 Afra 6h 19.0m UT 8.4 10 59 10.248 6 55 51.07HIP 53697 8.9 16.8 32 1.0 3.050 3.030 -24.35 27.907 6.937 81.15 -14.96 6.3167 -.33461 -.62238 15.64842 -8.44378 -0.00447 0.00188 2000 75.992513620071027.00000 74.282240327.465122 10.7255230.221952572.639950272.0540065211.35 0.15 RATE 2.2977907 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.029 0.022 111.9 2.580 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Oct 23, 22:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org