IOTA/IOTA-ES occultation update for (896) Sphinx / HIP 16407 event on 2012 Oct 21, 06:24 UT Visible from Africa, Caribbean, Central America Summary ------- On 2012 Oct 21 UT, the 15 km diameter asteroid (896) Sphinx will occult a 8.1 mag star in the constellation Taurus for observers along a path across Africa, Caribbean, Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.6 mag to 15.7 mag (the magnitude of the asteroid) for at most 1.4 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 31 * date and approx. time of event: 2012 Oct 21, 06:15 - 2012 Oct 21, 06:34 UT * geocentric midpoint of event [JD]: 2456221.767125 * magnitude of target star: 8.1 * magnitude drop [mag]: 7.6 * estimated maximum duration [s]: 1.4 * Moon: 40 % sunlit, 129° distance * Sun: 151° distance * rough path description: Africa, Caribbean, Central America Additional comments ------------------- 2" double star The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 2.15 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .025", 87° ) * approx speed of asteroid's shadow [km/s]: 10.1793 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 16407 by 896 Sphinx on 2012 Oct 21 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 -152 0 0 -25 45 21 6 34 58 1 61 -30 -25 40 39 -25 50 3 -25 20 29 -26 10 15 -151 0 0 -25 15 37 6 34 58 2 61 -31 -25 10 54 -25 20 19 -24 50 41 -25 40 34 -150 0 0 -24 45 27 6 34 57 3 61 -32 -24 40 43 -24 50 10 -24 20 27 -25 10 28 -149 0 0 -24 14 51 6 34 57 4 60 -33 -24 10 8 -24 19 35 -23 49 49 -24 39 56 -148 0 0 -23 43 52 6 34 56 5 60 -34 -23 39 8 -23 48 36 -23 18 46 -24 9 0 -147 0 0 -23 12 29 6 34 55 6 59 -35 -23 7 44 -23 17 14 -22 47 20 -23 37 40 -146 0 0 -22 40 42 6 34 54 7 59 -36 -22 35 57 -22 45 28 -22 15 30 -23 5 57 -145 0 0 -22 8 33 6 34 52 8 59 -37 -22 3 47 -22 13 19 -21 43 18 -22 33 51 -144 0 0 -21 36 2 6 34 50 9 58 -38 -21 31 16 -21 40 49 -21 10 44 -22 1 23 -143 0 0 -21 3 11 6 34 48 10 58 -39 -20 58 24 -21 7 58 -20 37 50 -21 28 34 -142 0 0 -20 29 58 6 34 46 11 57 -40 -20 25 11 -20 34 46 -20 4 35 -20 55 24 -141 0 0 -19 56 27 6 34 44 12 57 -41 -19 51 39 -20 1 15 -19 31 1 -20 21 55 -140 0 0 -19 22 37 6 34 41 13 57 -42 -19 17 48 -19 27 25 -18 57 8 -19 48 7 -139 0 0 -18 48 28 6 34 38 14 56 -43 -18 43 40 -18 53 17 -18 22 58 -19 14 1 -138 0 0 -18 14 3 6 34 35 15 56 -45 -18 9 14 -18 18 53 -17 48 31 -18 39 38 -137 0 0 -17 39 22 6 34 32 17 56 -46 -17 34 33 -17 44 12 -17 13 48 -18 4 59 -136 0 0 -17 4 26 6 34 28 18 56 -47 -16 59 36 -17 9 16 -16 38 51 -17 30 4 -135 0 0 -16 29 16 6 34 24 19 55 -48 -16 24 26 -16 34 7 -16 3 39 -16 54 56 -134 0 0 -15 53 53 6 34 20 20 55 -49 -15 49 3 -15 58 44 -15 28 15 -16 19 34 -133 0 0 -15 18 18 6 34 16 21 55 -50 -15 13 27 -15 23 9 -14 52 38 -15 44 0 -132 0 0 -14 42 32 6 34 12 22 54 -51 -14 37 41 -14 47 22 -14 16 51 -15 8 14 -131 0 0 -14 6 35 6 34 7 23 54 -52 -14 1 44 -14 11 26 -13 40 54 -14 32 19 -130 0 0 -13 30 30 6 34 2 24 54 -53 -13 25 39 -13 35 21 -13 4 49 -13 56 14 -129 0 0 -12 54 17 6 33 57 25 54 -54 -12 49 26 -12 59 8 -12 28 35 -13 20 1 -128 0 0 -12 17 57 6 33 51 27 53 -56 -12 13 6 -12 22 49 -11 52 15 -12 43 42 -127 0 0 -11 41 32 6 33 45 28 53 -57 -11 36 41 -11 46 23 -11 15 50 -12 7 16 -126 0 0 -11 5 2 6 33 39 29 53 -58 -11 0 11 -11 9 53 -10 39 20 -11 30 46 -125 0 0 -10 28 29 6 33 33 30 53 -59 -10 23 37 -10 33 20 -10 2 47 -10 54 13 -124 0 0 - 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5 0 0 20 24 58 6 15 43 30 288 -1 20 29 11 20 20 44 20 47 21 20 2 33 - 4 0 0 20 11 38 6 15 38 29 289 0 20 15 52 20 7 24 20 34 4 19 49 11 Uncertainty in time = +/- 5 secs Prediction of 2012 Jul 10.0 Data for the target star ------------------------ * name: HIP 16407 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 31 15.9744 DE: +25 15 19.073 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .023, .018 ) * V mag [mag]: 8.1 * B mag [mag]: 8.4 * Apparent position with proper motion RA(deg): 53.0173954545 DE(deg): 25.2991047949 * Equation of equinoxes (radians) : 0.000060610599018 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (896) Sphinx approx. diameter [km]: 15 approx. diameter ["]: .012 distance from Earth [AU]: 1.67700 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1168 number of rejected observations: 42 time covered by the observations: 1918 Oct 09 - 2011 Aug 27 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.017, 85° remarks: * orbital elements for (896) Sphinx : Mean anomaly = 139.68071233 deg Arg. of pericenter = 1.49564289 deg Long. of node = 254.22796803 deg Inclination = 8.18999470 deg Eccentricity = 0.16309128 Semimajor axis = 2.28620561 AU Perihelion dist = 1.91334541 AU Mag: H = 11.61, G = 0.15 Epoch of elements : MJD 56221.26700000 TDT (2012 Oct 21.267) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 21 896 Sphinx 6h 24.7m UT 8.1 3 31 15.974 25 15 19.07HIP 16407 8.4 15.7 15 1.4 1.677 -2.087 -10.36 -73.4551 25.258 79.99 -10.86 6.4110 0.05197 -0.14366 -5.39613 -1.97283 -0.00251 -0.00117 2000 139.31946220121020.00000 1.495643254.227968 8.1899950.16309128 2.2862056 1.913345411.8 5.00.15 RATE 2.8512230 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.025 87 3.15 0.027 0 0 4 3 056118.0020121021__16407 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 26, 04:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org