IOTA/IOTA-ES occultation update for (4265) Kani / TYC 1303-01868-1 event on 2012 Nov 16, 00:06 UT Visible from Africa Summary ------- On 2012 Nov 16 UT, the 16 km diameter asteroid (4265) Kani will occult a 9.0 mag star in the constellation Taurus 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 6.8 mag to 15.8 mag (the magnitude of the asteroid) for at most 2.8 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: 25 * date and approx. time of event: 2012 Nov 15, 23:53 - 2012 Nov 16, 00:22 UT * geocentric midpoint of event [JD]: 2456247.5043625 * magnitude of target star: 9.0 * magnitude drop [mag]: 6.8 * estimated maximum duration [s]: 2.8 * Moon: 6 % sunlit, 174° distance * Sun: 145° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 2.68 * 1 sigma uncertainty interval [seconds]: +/- 9.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .063 +/- .048) * 1 sigma uncertainty ellipse (major, minor, PA): ( .063", .048", 84° ) * approx speed of asteroid's shadow [km/s]: 5.5229 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1303-01868-1 by 4265 Kani on 2012 Nov 15 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 - 52 0 0 -29 49 19 24 22 58 1 69 -27 -29 43 56 -29 54 43 .. .. .. -30 23 42 - 51 0 0 -29 30 11 24 22 58 2 69 -27 -29 24 48 -29 35 34 .. .. .. -30 4 33 - 50 0 0 -29 11 3 24 22 57 3 68 -28 -29 5 40 -29 16 27 .. .. .. -29 45 24 - 49 0 0 -28 51 57 24 22 56 4 68 -29 -28 46 34 -28 57 20 -28 17 49 -29 26 17 - 48 0 0 -28 32 51 24 22 54 4 68 -30 -28 27 29 -28 38 14 -27 58 45 -29 7 10 - 47 0 0 -28 13 48 24 22 52 5 67 -31 -28 8 26 -28 19 11 -27 39 43 -28 48 6 - 46 0 0 -27 54 47 24 22 50 6 67 -32 -27 49 25 -28 0 10 -27 20 43 -28 29 4 - 45 0 0 -27 35 49 24 22 48 7 66 -32 -27 30 27 -27 41 11 -27 1 47 -28 10 4 - 44 0 0 -27 16 54 24 22 45 8 66 -33 -27 11 33 -27 22 16 -26 42 53 -27 51 8 - 43 0 0 -26 58 3 24 22 42 9 65 -34 -26 52 42 -27 3 25 -26 24 4 -27 32 15 - 42 0 0 -26 39 16 24 22 38 10 65 -35 -26 33 55 -26 44 38 -26 5 18 -27 13 27 - 41 0 0 -26 20 33 24 22 34 11 64 -36 -26 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34 43 -13 57 28 -15 2 0 67 0 0 -14 38 24 23 56 17 44 313 -14 -14 33 20 -14 43 29 -14 6 12 -15 10 48 68 0 0 -14 47 27 23 56 2 43 312 -13 -14 42 22 -14 52 32 -14 15 13 -15 19 52 69 0 0 -14 56 47 23 55 47 42 311 -12 -14 51 42 -15 1 52 -14 24 31 -15 29 14 70 0 0 -15 6 24 23 55 33 42 311 -11 -15 1 18 -15 11 30 -14 34 6 -15 38 53 71 0 0 -15 16 18 23 55 19 41 310 -10 -15 11 12 -15 21 24 -14 43 57 -15 48 49 72 0 0 -15 26 28 23 55 5 40 309 -9 -15 21 22 -15 31 35 -14 54 6 -15 59 1 73 0 0 -15 36 55 23 54 51 39 309 -8 -15 31 49 -15 42 2 -15 4 31 -16 9 31 74 0 0 -15 47 39 23 54 38 38 308 -7 -15 42 33 -15 52 46 -15 15 13 -16 20 17 75 0 0 -15 58 40 23 54 25 38 308 -6 -15 53 33 -16 3 47 -15 26 11 -16 31 19 76 0 0 -16 9 56 23 54 11 37 307 -5 -16 4 49 -16 15 4 -15 37 26 -16 42 38 77 0 0 -16 21 29 23 53 59 36 307 -5 -16 16 21 -16 26 37 -15 48 56 -16 54 13 78 0 0 -16 33 18 23 53 46 35 306 -4 -16 28 10 -16 38 26 -16 0 43 -17 6 4 79 0 0 -16 45 23 23 53 34 34 305 -3 -16 40 14 -16 50 32 -16 12 45 -17 18 11 80 0 0 -16 57 43 23 53 22 33 305 -2 -16 52 35 -17 2 53 -16 25 4 -17 30 34 81 0 0 -17 10 20 23 53 10 33 304 -1 -17 5 10 -17 15 29 -16 37 37 -17 43 13 Uncertainty in time = +/- 10 secs Prediction of 2012 Jul 10.0 Data for the target star ------------------------ * name: TYC 1303-01868-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 51 16.9667 DE: +17 20 06.484 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .022 ) * V mag [mag]: 9.0 * B mag [mag]: 10.3 * Apparent position with proper motion RA(deg): 88.0168515634 DE(deg): 17.3366995342 * Equation of equinoxes (radians) : 0.000058163232931 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4265) Kani approx. diameter [km]: 16 approx. diameter ["]: .018 distance from Earth [AU]: 1.24300 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1281 number of rejected observations: 22 time covered by the observations: 1940 Nov 29 - 2011 Aug 27 1 sigma uncertainty ellipse (major, minor, PA): 0.058, 0.043, 83° remarks: * orbital elements for (4265) Kani : Mean anomaly = 43.43925951 deg Arg. of pericenter = 243.10452476 deg Long. of node = 127.26405955 deg Inclination = 4.35504663 deg Eccentricity = 0.20076597 Semimajor axis = 2.42882514 AU Perihelion dist = 1.94119970 AU Mag: H = 12.91, G = 0.15 Epoch of elements : MJD 56247.00400000 TDT (2012 Nov 16.004) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 16 4265 Kani 0h 6.3m UT 9.0 5 51 16.967 17 20 6.48TYC 1303-01868-1 10.3 15.8 16 2.8 1.243 -1.542 -0.67 30.7745 17.334 174.63 -18.78 0.1047 0.01508 -0.49592 -3.11585 -0.09476 -0.00312 0.00044 2000 41.615550201211 9.00000243.104525127.264060 4.3550470.20076597 2.4288251 1.941199712.8 5.00.15 RATE 2.6038120 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.063 0.048 84 3.68 0.048 0 0-3 4 056118.0020121116_1868-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 25, 20:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org