IOTA/IOTA-ES occultation update for (1567) Alikoski / TYC 6982-00833-1 event on 2012 Aug 24, 12:36 UT Visible from S Australia Summary ------- On 2012 Aug 24 UT, the 70 km diameter asteroid (1567) Alikoski will occult a 10.9 mag star in the constellation Cetus for observers along a path across S Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.9 mag to 14.8 mag (the magnitude of the asteroid) for at most 5.3 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: 60 * date and approx. time of event: 2012 Aug 24, 12:28 - 2012 Aug 24, 12:44 UT * geocentric midpoint of event [JD]: 2456164.02532917 * magnitude of target star: 10.9 * magnitude drop [mag]: 3.9 * estimated maximum duration [s]: 5.3 * Moon: 50 % sunlit, 106° distance * Sun: 152° distance * rough path description: S Australia The occultation path -------------------- * approximate projected width [km]: 70 * 1 sigma uncertainty interval [path widths]: +/- 1.03 * 1 sigma uncertainty interval [seconds]: +/- 5.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .039", 69° ) * approx speed of asteroid's shadow [km/s]: 13.1682 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6982-00833-1 by 1567 Alikoski on 2012 Aug 24 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 93 0 0 -26 8 41 12 44 32 0 117 -17 -25 47 23 -26 30 0 -25 3 27 -27 13 53 94 0 0 -26 36 7 12 44 32 2 117 -18 -26 14 53 -26 57 20 -25 31 9 -27 41 1 95 0 0 -27 2 52 12 44 32 2 116 -19 -26 41 44 -27 23 59 -25 58 10 -28 7 30 96 0 0 -27 28 56 12 44 31 3 116 -20 -27 7 54 -27 49 59 -26 24 31 -28 33 18 97 0 0 -27 54 21 12 44 31 4 115 -20 -27 33 24 -28 15 18 -26 50 12 -28 58 27 98 0 0 -28 19 6 12 44 30 5 115 -21 -27 58 14 -28 39 58 -27 15 13 -29 22 56 99 0 0 -28 43 12 12 44 29 6 114 -22 -28 22 25 -29 3 59 -27 39 35 -29 46 47 100 0 0 -29 6 39 12 44 28 7 114 -23 -28 45 57 -29 27 21 -28 3 17 -30 9 58 101 0 0 -29 29 27 12 44 27 8 113 -24 -29 8 50 -29 50 4 -28 26 20 -30 32 31 102 0 0 -29 51 36 12 44 26 9 113 -25 -29 31 4 -30 12 8 -28 48 44 -30 54 26 103 0 0 -30 13 7 12 44 24 10 112 -26 -29 52 40 -30 33 35 -29 10 29 -31 15 43 104 0 0 -30 34 0 12 44 23 11 112 -27 -30 13 37 -30 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-109 0 0 13 31 24 12 29 16 27 233 -9 13 54 45 13 8 3 14 42 52 12 20 0 -108 0 0 14 13 8 12 29 11 26 234 -8 14 36 25 13 49 50 15 24 26 13 1 54 -107 0 0 14 54 26 12 29 7 24 234 -7 15 17 40 14 31 12 16 5 33 13 43 22 -106 0 0 15 35 18 12 29 3 23 234 -6 15 58 28 15 12 8 16 46 14 14 24 25 -105 0 0 16 15 42 12 28 59 22 234 -5 16 38 49 15 52 36 17 26 27 15 5 1 -104 0 0 16 55 38 12 28 56 21 235 -4 17 18 40 16 32 35 18 6 10 15 45 9 -103 0 0 17 35 4 12 28 52 20 235 -3 17 58 2 17 12 6 18 45 24 16 24 48 -102 0 0 18 13 59 12 28 49 19 235 -2 18 36 53 17 51 5 19 24 6 17 3 56 -101 0 0 18 52 23 12 28 46 17 236 -1 19 15 13 18 29 33 20 2 17 17 42 33 Uncertainty in time = +/- 6 secs Prediction of 2012 Jul 3.0 Data for the target star ------------------------ * name: TYC 6982-00833-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 57 25.3118 DE: -24 32 05.768 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .035 ) * V mag [mag]: 10.9 * B mag [mag]: 11.3 * Apparent position with proper motion RA(deg): 359.5264081180 DE(deg): -24.4598913994 * Equation of equinoxes (radians) : 0.000070957230144 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1567) Alikoski approx. diameter [km]: 70 approx. diameter ["]: .038 distance from Earth [AU]: 2.55500 * orbital information: orbit source: Preston date of fit: 2012 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 825 number of rejected observations: 26 time covered by the observations: 1938 Oct 15 - 2011 Aug 30 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.019, 56° remarks: * orbital elements for (1567) Alikoski : Mean anomaly = 178.54375362 deg Arg. of pericenter = 112.61548607 deg Long. of node = 51.60821611 deg Inclination = 17.28636757 deg Eccentricity = 0.08452146 Semimajor axis = 3.20864302 AU Perihelion dist = 2.93744384 AU Mag: H = 9.60, G = 0.15 Epoch of elements : MJD 56163.52500000 TDT (2012 Aug 24.525) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 24 1567 Alikoski 12h 36.5m UT 10.9 23 57 25.312-24 32 5.77TYC 6982-00833-1 11.3 14.8 70 5.3 2.555 -1.630 -12.66 -162.9585 -24.531 -8.55 10.85 12.6079 -0.01047 0.01701 -6.45791 -3.67934 -0.00243 0.00114 2000 177.9392752012 821.00000112.615486 51.608216 17.2863680.08452146 3.2086430 2.9374438 9.5 5.00.15 RATE 1.7148340 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.039 69 2.03 0.039 0 0-2 2 056111.0020120824_0833-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 03, 01:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org