IOTA/IOTA-ES occultation update for (1014) Semphyra / TYC 1861-01126-1 event on 2012 Nov 11, 23:03 UT Visible from China, SW Asia, Arabia, Africa Summary ------- On 2012 Nov 11 UT, the 17 km diameter asteroid (1014) Semphyra will occult a 10.0 mag star in the constellation Taurus for observers along a path across China, SW Asia, Arabia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 15.7 mag (the magnitude of the asteroid) for at most 4.0 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: UCAC. The event at a glimpse ---------------------- * Rank: 27 * date and approx. time of event: 2012 Nov 11, 22:42 - 2012 Nov 11, 23:27 UT * geocentric midpoint of event [JD]: 2456243.46019167 * magnitude of target star: 10.0 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 4.0 * Moon: 6 % sunlit, 116° distance * Sun: 144° distance * rough path description: China, SW Asia, Arabia, Africa The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 2.49 * 1 sigma uncertainty interval [seconds]: +/- 13.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .057 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .057", .036", 90° ) * approx speed of asteroid's shadow [km/s]: 4.2714 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1861-01126-1 by 1014 Semphyra on 2012 Nov 11 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 - 43 0 0 - 9 55 23 23 27 32 1 66 -36 - 9 50 21 -10 0 26 - 9 25 14 -10 25 32 - 42 0 0 - 9 28 58 23 27 32 2 66 -37 - 9 23 56 - 9 34 1 - 8 58 47 - 9 59 10 - 41 0 0 - 9 2 20 23 27 30 3 66 -38 - 8 57 17 - 9 7 24 - 8 32 7 - 9 32 34 - 40 0 0 - 8 35 30 23 27 29 4 66 -39 - 8 30 27 - 8 40 34 - 8 5 15 - 9 5 46 - 39 0 0 - 8 8 28 23 27 27 5 66 -40 - 8 3 24 - 8 13 32 - 7 38 11 - 8 38 45 - 38 0 0 - 7 41 15 23 27 24 6 65 -41 - 7 36 11 - 7 46 19 - 7 10 56 - 8 11 34 - 37 0 0 - 7 13 51 23 27 21 7 65 -42 - 7 8 47 - 7 18 56 - 6 43 31 - 7 44 12 - 36 0 0 - 6 46 18 23 27 17 8 65 -43 - 6 41 13 - 6 51 22 - 6 15 56 - 7 16 40 - 35 0 0 - 6 18 35 23 27 13 9 65 -44 - 6 13 30 - 6 23 40 - 5 48 12 - 6 48 59 - 34 0 0 - 5 50 45 23 27 8 10 65 -46 - 5 45 40 - 5 55 50 - 5 20 20 - 6 21 10 - 33 0 0 - 5 22 46 23 27 3 11 65 -47 - 5 17 41 - 5 27 52 - 4 52 21 - 5 53 13 - 32 0 0 - 4 54 41 23 26 57 12 65 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25 51 27 24 55 12 113 0 0 25 11 44 22 42 34 36 282 -1 25 16 27 25 7 2 25 39 54 24 43 34 Uncertainty in time = +/- 15 secs Prediction of 2012 Jul 10.0 Data for the target star ------------------------ * name: TYC 1861-01126-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 41 00.1459 DE: +23 22 24.458 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .017 ) * V mag [mag]: 10.0 * B mag [mag]: 10.4 * Apparent position with proper motion RA(deg): 85.4553300193 DE(deg): 23.3781101914 * Equation of equinoxes (radians) : 0.000056968462519 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1014) Semphyra approx. diameter [km]: 17 approx. diameter ["]: .015 distance from Earth [AU]: 1.52900 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1132 number of rejected observations: 32 time covered by the observations: 1924 Jan 29 - 2012 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.054, 0.032, 90° remarks: * orbital elements for (1014) Semphyra : Mean anomaly = 323.70122679 deg Arg. of pericenter = 232.99104744 deg Long. of node = 251.75710124 deg Inclination = 2.26828198 deg Eccentricity = 0.20070558 Semimajor axis = 2.80437845 AU Perihelion dist = 2.24152404 AU Mag: H = 11.84, G = 0.15 Epoch of elements : MJD 56242.96100000 TDT (2012 Nov 11.961) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 11 1014 Semphyra 23h 2.7m UT 10.0 5 41 0.146 23 22 24.46TYC 1861-01126-1 10.4 15.7 17 4.0 1.529 -0.984 -3.05 48.0933 23.374 -169.63 -17.73 23.0446 -0.00657 0.02907 -2.35179 -0.53055 -0.00338 -0.00011 2000 323.079804201211 9.00000232.991047251.757101 2.2682820.20070558 2.8043785 2.241524012.1 5.00.15 RATE 2.0986940 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.057 0.036 90 3.49 0.038 0 0-1-2 056118.0020121111_1126-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 25, 19:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org