IOTA/IOTA-ES occultation update for (4265) Kani / TYC 1270-00669-1 event on 2012 Aug 17, 07:44 UT Visible from Brazil, Bolivia Summary ------- On 2012 Aug 17 UT, the 16 km diameter asteroid (4265) Kani will occult a 10.1 mag star in the constellation Taurus for observers along a path across Brazil, Bolivia. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.0 mag to 17.1 mag (the magnitude of the asteroid) for at most 0.6 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: 19 * date and approx. time of event: 2012 Aug 17, 07:41 - 2012 Aug 17, 07:43 UT * geocentric midpoint of event [JD]: 2456156.82270417 * magnitude of target star: 10.1 * magnitude drop [mag]: 7.0 * estimated maximum duration [s]: 0.6 * Moon: 0 % sunlit, 70° distance * Sun: 75° distance * rough path description: Brazil, Bolivia The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 3.61 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .040", 83° ) * approx speed of asteroid's shadow [km/s]: 26.4071 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1270-00669-1 by 4265 Kani on 2012 Aug 17 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 - 92 0 0 -29 12 48 7 41 4 0 70 -64 -29 17 54 -29 7 42 .. .. .. .. .. .. - 91 0 0 -28 53 13 7 41 4 1 69 -63 -28 58 18 -28 48 7 -29 35 14 .. .. .. - 90 0 0 -28 33 31 7 41 4 2 69 -63 -28 38 37 -28 28 25 -29 15 32 .. .. .. - 89 0 0 -28 13 42 7 41 4 3 68 -62 -28 18 48 -28 8 36 -28 55 44 .. .. .. - 88 0 0 -27 53 48 7 41 4 4 68 -61 -27 58 54 -27 48 42 -28 35 51 -27 12 0 - 87 0 0 -27 33 48 7 41 5 5 67 -61 -27 38 54 -27 28 42 -28 15 51 -26 51 59 - 86 0 0 -27 13 42 7 41 5 6 67 -60 -27 18 49 -27 8 36 -27 55 46 -26 31 54 - 85 0 0 -26 53 32 7 41 5 7 66 -59 -26 58 39 -26 48 26 -27 35 37 -26 11 43 - 84 0 0 -26 33 18 7 41 6 8 66 -59 -26 38 25 -26 28 12 -27 15 23 -25 51 29 - 83 0 0 -26 13 0 7 41 7 9 65 -58 -26 18 7 -26 7 54 -26 55 5 -25 31 11 - 82 0 0 -25 52 39 7 41 7 10 65 -57 -25 57 45 -25 47 33 -26 34 43 -25 10 50 - 81 0 0 -25 32 15 7 41 8 10 65 -56 -25 37 21 -25 27 9 -26 14 19 -24 50 25 - 80 0 0 -25 11 48 7 41 9 11 64 -56 -25 16 54 -25 6 42 -25 53 52 -24 29 59 - 79 0 0 -24 51 19 7 41 10 12 64 -55 -24 56 25 -24 46 13 -25 33 23 -24 9 31 - 78 0 0 -24 30 49 7 41 11 13 63 -54 -24 35 55 -24 25 43 -25 12 52 -23 49 1 - 77 0 0 -24 10 18 7 41 12 14 63 -53 -24 15 24 -24 5 12 -24 52 21 -23 28 30 - 76 0 0 -23 49 46 7 41 13 15 62 -52 -23 54 52 -23 44 40 -24 31 48 -23 7 59 - 75 0 0 -23 29 15 7 41 14 16 62 -51 -23 34 20 -23 24 9 -24 11 16 -22 47 28 - 74 0 0 -23 8 43 7 41 16 17 61 -51 -23 13 49 -23 3 38 -23 50 44 -22 26 58 - 73 0 0 -22 48 13 7 41 17 18 61 -50 -22 53 19 -22 43 7 -23 30 12 -22 6 28 - 72 0 0 -22 27 44 7 41 19 19 61 -49 -22 32 50 -22 22 39 -23 9 43 -21 46 1 - 71 0 0 -22 7 17 7 41 20 20 60 -48 -22 12 23 -22 2 12 -22 49 14 -21 25 35 - 70 0 0 -21 46 53 7 41 22 21 60 -47 -21 51 58 -21 41 48 -22 28 49 -21 5 12 - 69 0 0 -21 26 31 7 41 24 22 59 -46 -21 31 36 -21 21 26 -22 8 26 -20 44 52 - 68 0 0 -21 6 13 7 41 25 23 59 -45 -21 11 18 -21 1 9 -21 48 7 -20 24 35 - 67 0 0 -20 45 59 7 41 27 24 58 -44 -20 51 4 -20 40 55 -21 27 51 -20 4 22 - 66 0 0 -20 25 50 7 41 29 25 58 -43 -20 30 54 -20 20 45 -21 7 40 -19 44 14 - 65 0 0 -20 5 45 7 41 31 26 57 -42 -20 10 49 -20 0 41 -20 47 33 -19 24 11 - 64 0 0 -19 45 46 7 41 33 27 57 -41 -19 50 50 -19 40 42 -20 27 32 -19 4 14 - 63 0 0 -19 25 53 7 41 35 28 57 -40 -19 30 57 -19 20 49 -20 7 37 -18 44 23 - 62 0 0 -19 6 6 7 41 38 29 56 -39 -19 11 10 -19 1 3 -19 47 49 -18 24 38 - 61 0 0 -18 46 26 7 41 40 30 56 -39 -18 51 30 -18 41 23 -19 28 7 -18 5 0 - 60 0 0 -18 26 54 7 41 42 31 55 -38 -18 31 57 -18 21 51 -19 8 32 -17 45 30 - 59 0 0 -18 7 29 7 41 45 32 55 -37 -18 12 32 -18 2 27 -18 49 6 -17 26 7 - 58 0 0 -17 48 13 7 41 47 33 54 -36 -17 53 16 -17 43 11 -18 29 47 -17 6 53 - 57 0 0 -17 29 6 7 41 50 34 54 -35 -17 34 8 -17 24 4 -18 10 38 -16 47 48 - 56 0 0 -17 10 8 7 41 53 35 53 -34 -17 15 10 -17 5 6 -17 51 38 -16 28 53 - 55 0 0 -16 51 20 7 41 55 36 53 -33 -16 56 22 -16 46 18 -17 32 47 -16 10 7 - 54 0 0 -16 32 42 7 41 58 37 52 -32 -16 37 44 -16 27 41 -17 14 7 -15 51 32 - 53 0 0 -16 14 15 7 42 1 38 51 -31 -16 19 16 -16 9 14 -16 55 37 -15 33 7 - 52 0 0 -15 55 59 7 42 4 39 51 -30 -16 1 0 -15 50 58 -16 37 19 -15 14 53 - 51 0 0 -15 37 54 7 42 7 40 50 -29 -15 42 55 -15 32 54 -16 19 12 -14 56 52 - 50 0 0 -15 20 2 7 42 10 41 50 -28 -15 25 2 -15 15 2 -16 1 17 -14 39 2 - 49 0 0 -15 2 22 7 42 13 41 49 -27 -15 7 22 -14 57 22 -15 43 34 -14 21 24 - 48 0 0 -14 44 55 7 42 16 42 48 -26 -14 49 55 -14 39 55 -15 26 4 -14 4 0 - 47 0 0 -14 27 41 7 42 19 43 48 -25 -14 32 40 -14 22 42 -15 8 48 -13 46 49 - 46 0 0 -14 10 41 7 42 23 44 47 -24 -14 15 40 -14 5 42 -14 51 45 -13 29 51 - 45 0 0 -13 53 55 7 42 26 45 46 -23 -13 58 53 -13 48 56 -14 34 56 -13 13 7 - 44 0 0 -13 37 23 7 42 29 46 46 -22 -13 42 21 -13 32 25 -14 18 21 -12 56 38 - 43 0 0 -13 21 6 7 42 33 47 45 -21 -13 26 4 -13 16 8 -14 2 1 -12 40 24 - 42 0 0 -13 5 4 7 42 36 48 44 -20 -13 10 2 -13 0 6 -13 45 57 -12 24 25 - 41 0 0 -12 49 18 7 42 40 49 43 -19 -12 54 15 -12 44 21 -13 30 8 -12 8 41 - 40 0 0 -12 33 47 7 42 44 50 42 -17 -12 38 44 -12 28 50 -13 14 34 -11 53 14 - 39 0 0 -12 18 33 7 42 47 50 41 -16 -12 23 30 -12 13 36 -12 59 17 -11 38 2 - 38 0 0 -12 3 35 7 42 51 51 41 -15 -12 8 31 -11 58 39 -12 44 17 -11 23 7 - 37 0 0 -11 48 54 7 42 55 52 40 -14 -11 53 50 -11 43 59 -12 29 33 -11 8 29 - 36 0 0 -11 34 31 7 42 58 53 39 -13 -11 39 26 -11 29 35 -12 15 7 -10 54 8 - 35 0 0 -11 20 24 7 43 2 54 37 -12 -11 25 20 -11 15 29 -12 0 58 -10 40 4 - 34 0 0 -11 6 36 7 43 6 54 36 -11 -11 11 31 -11 1 41 -11 47 7 -10 26 19 - 33 0 0 -10 53 5 7 43 10 55 35 -10 -10 58 0 -10 48 11 -11 33 33 -10 12 51 - 32 0 0 -10 39 53 7 43 14 56 34 -9 -10 44 48 -10 34 59 -11 20 19 - 9 59 41 - 31 0 0 -10 27 0 7 43 18 57 33 -8 -10 31 54 -10 22 6 -11 7 22 - 9 46 50 - 30 0 0 -10 14 25 7 43 22 57 31 -7 -10 19 19 -10 9 31 -10 54 45 - 9 34 18 - 29 0 0 -10 2 9 7 43 26 58 30 -6 -10 7 3 - 9 57 16 -10 42 27 - 9 22 5 - 28 0 0 - 9 50 13 7 43 30 59 29 -5 - 9 55 6 - 9 45 20 -10 30 28 - 9 10 11 - 27 0 0 - 9 38 36 7 43 34 59 27 -4 - 9 43 29 - 9 33 43 -10 18 49 - 8 58 37 - 26 0 0 - 9 27 19 7 43 38 60 26 -3 - 9 32 11 - 9 22 27 -10 7 29 - 8 47 22 - 25 0 0 - 9 16 22 7 43 42 61 24 -2 - 9 21 14 - 9 11 30 - 9 56 30 - 8 36 27 - 24 0 0 - 9 5 45 7 43 46 61 22 -1 - 9 10 37 - 9 0 53 - 9 45 50 - 8 25 52 - 23 0 0 - 8 55 28 7 43 51 62 20 0 - 9 0 20 - 8 50 37 - 9 35 32 - 8 15 38 Uncertainty in time = +/- 2 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 1270-00669-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 35 37.5972 DE: +17 38 54.115 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .034 ) * V mag [mag]: 10.1 * B mag [mag]: 11.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4265) Kani approx. diameter [km]: 16 approx. diameter ["]: .011 distance from Earth [AU]: 1.99500 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 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): 0.031, 0.021, 78° remarks: * orbital elements for (4265) Kani : Mean anomaly = 19.82855666 deg Arg. of pericenter = 243.10482945 deg Long. of node = 127.27409544 deg Inclination = 4.35475466 deg Eccentricity = 0.20060318 Semimajor axis = 2.42848504 AU Perihelion dist = 1.94132323 AU Mag: H = 12.91, G = 0.15 Epoch of elements : MJD 56156.32300000 TDT (2012 Aug 17.323) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 17 4265 Kani 7h 44.7m UT 10.1 4 35 37.597 17 38 54.12TYC 1270-00669-1 11.2 17.1 16 0.6 1.995 4.576 6.41 -13.3632 17.646 64.83 13.25 7.7449 0.03854 -0.42153 14.83382 1.45381 -0.00489 -0.00081 2000 18.1818212012 811.00000243.104829127.274095 4.3547550.20060318 2.4284850 1.941323212.8 5.00.15 RATE 2.6043590 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.040 83 4.61 0.040 0 0 2-5 056129.0020120817_0669-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 14:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org