IOTA/IOTA-ES occultation update for (2015) Kachuevskaya / TYC 1202-01457-1 event on 2008 Oct 15, 12:26 UT Visible from SW USA, Japan, China Summary ------- On 2008 Oct 15 UT, the 11 km diameter asteroid (2015) Kachuevskaya will occult a 8.9 mag star in the constellation Pisces for observers along a path across SW USA, Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.7 mag to 15.6 mag (the magnitude of the asteroid) for at most 0.9 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: 11 * date and approx. time of event: 2008 Oct 15, 12:18 - 2008 Oct 15, 12:34 UT * magnitude of target star: 8.9 * magnitude drop [mag]: 6.7 * estimated maximum duration [s]: 0.9 * Moon: 99 % sunlit, 10° distance * Sun: 167° distance * rough path description: SW USA, Japan, China The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 5.83 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .068 +/- .060) * 1 sigma uncertainty ellipse (major, minor, PA): ( .072", .055", 58° ) * approx speed of asteroid's shadow [km/s]: 12.0669 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1202-01457-1 by 2015 Kachuevskaya on 2008 Oct 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 76 0 0 14 41 52 12 34 35 6 69 -1 14 45 21 14 38 23 15 26 4 13 57 54 77 0 0 15 6 42 12 34 34 7 70 -2 15 10 11 15 3 13 15 50 57 14 22 41 78 0 0 15 31 40 12 34 32 8 70 -3 15 35 10 15 28 11 16 15 58 14 47 37 79 0 0 15 56 46 12 34 31 9 70 -4 16 0 15 15 53 16 16 41 6 15 12 40 80 0 0 16 21 58 12 34 29 10 71 -5 16 25 28 16 18 28 17 6 21 15 37 49 81 0 0 16 47 16 12 34 27 11 71 -6 16 50 46 16 43 46 17 31 42 16 3 5 82 0 0 17 12 40 12 34 25 12 71 -7 17 16 10 17 9 10 17 57 8 16 28 27 83 0 0 17 38 9 12 34 23 13 71 -8 17 41 39 17 34 38 18 22 39 16 53 53 84 0 0 18 3 41 12 34 20 14 72 -9 18 7 12 18 0 11 18 48 14 17 19 24 85 0 0 18 29 17 12 34 18 15 72 -9 18 32 48 18 25 47 19 13 52 17 44 58 86 0 0 18 54 56 12 34 15 17 73 -10 18 58 27 18 51 26 19 39 33 18 10 35 87 0 0 19 20 37 12 34 12 18 73 -11 19 24 8 19 17 6 20 5 16 18 36 14 88 0 0 19 46 20 12 34 9 19 73 -12 19 49 51 19 42 49 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7 41 12 33 3 33 80 -26 26 11 12 26 4 9 26 52 26 25 23 11 104 0 0 26 32 22 12 32 58 34 81 -27 26 35 53 26 28 50 27 17 6 25 47 53 105 0 0 26 56 54 12 32 53 35 82 -28 27 0 26 26 53 23 27 41 38 26 12 26 106 0 0 27 21 17 12 32 47 36 82 -29 27 24 49 27 17 46 28 6 0 26 36 51 107 0 0 27 45 31 12 32 41 37 83 -29 27 49 2 27 42 0 28 30 12 27 1 5 108 0 0 28 9 34 12 32 36 38 84 -30 28 13 5 28 6 3 28 54 14 27 25 10 109 0 0 28 33 27 12 32 30 39 84 -31 28 36 58 28 29 56 29 18 5 27 49 4 110 0 0 28 57 8 12 32 24 40 85 -32 29 0 39 28 53 38 29 41 44 28 12 48 111 0 0 29 20 38 12 32 18 40 86 -33 29 24 9 29 17 8 30 5 13 28 36 19 112 0 0 29 43 56 12 32 12 41 87 -33 29 47 27 29 40 26 30 28 29 28 59 39 113 0 0 30 7 2 12 32 6 42 87 -34 30 10 32 30 3 32 30 51 32 29 22 47 114 0 0 30 29 55 12 31 59 43 88 -35 30 33 25 30 26 25 31 14 23 29 45 42 115 0 0 30 52 35 12 31 53 44 89 -36 30 56 5 30 49 5 31 37 0 30 8 24 116 0 0 31 15 1 12 31 47 45 90 -36 31 18 31 31 11 31 31 59 24 30 30 53 117 0 0 31 37 13 12 31 40 46 91 -37 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38 42 2 12 19 15 25 278 -20 38 45 25 38 38 39 39 25 2 37 59 16 -116 0 0 38 25 46 12 19 12 24 279 -19 38 29 9 38 22 22 39 8 50 37 42 55 -115 0 0 38 9 10 12 19 8 24 279 -18 38 12 34 38 5 46 38 52 19 37 26 16 -114 0 0 37 52 16 12 19 5 23 280 -18 37 55 40 37 48 52 38 35 28 37 9 17 -113 0 0 37 35 2 12 19 2 22 281 -17 37 38 27 37 31 38 38 18 19 36 51 59 -112 0 0 37 17 30 12 18 59 21 281 -16 37 20 55 37 14 5 38 0 51 36 34 22 -111 0 0 36 59 38 12 18 56 20 282 -15 37 3 3 36 56 13 37 43 3 36 16 27 -110 0 0 36 41 28 12 18 53 19 283 -15 36 44 53 36 38 2 37 24 57 35 58 12 -109 0 0 36 22 59 12 18 50 19 283 -14 36 26 25 36 19 33 37 6 32 35 39 39 -108 0 0 36 4 11 12 18 48 18 284 -13 36 7 37 36 0 45 36 47 49 35 20 48 -107 0 0 35 45 5 12 18 45 17 285 -12 35 48 32 35 41 39 36 28 47 35 1 38 -106 0 0 35 25 41 12 18 42 16 285 -11 35 29 8 35 22 14 36 9 27 34 42 9 -105 0 0 35 5 59 12 18 40 15 286 -11 35 9 26 35 2 31 35 49 48 34 22 23 -104 0 0 34 45 58 12 18 38 14 286 -10 34 49 26 34 42 31 35 29 52 34 2 19 -103 0 0 34 25 40 12 18 36 13 287 -9 34 29 8 34 22 12 35 9 38 33 41 57 -102 0 0 34 5 5 12 18 34 13 287 -8 34 8 33 34 1 37 34 49 6 33 21 18 -101 0 0 33 44 12 12 18 32 12 288 -7 33 47 40 33 40 43 34 28 17 33 0 21 -100 0 0 33 23 2 12 18 30 11 289 -6 33 26 30 33 19 33 34 7 11 32 39 7 - 99 0 0 33 1 35 12 18 29 10 289 -5 33 5 4 32 58 6 33 45 47 32 17 37 - 98 0 0 32 39 52 12 18 27 9 290 -5 32 43 21 32 36 22 33 24 7 31 55 50 - 97 0 0 32 17 52 12 18 26 8 290 -4 32 21 22 32 14 23 33 2 11 31 33 48 - 96 0 0 31 55 37 12 18 24 7 291 -3 31 59 6 31 52 7 32 39 59 31 11 29 - 95 0 0 31 33 5 12 18 23 6 291 -2 31 36 35 31 29 36 32 17 31 30 48 55 - 94 0 0 31 10 19 12 18 22 5 292 -1 31 13 49 31 6 49 31 54 48 30 26 5 - 93 0 0 30 47 18 12 18 22 4 292 0 30 50 48 30 43 47 31 31 49 30 3 1 Uncertainty in time = +/- 6 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 1202-01457-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 11 45.5858 DE: +21 19 55.945 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .013, .020 ) * V mag [mag]: 8.9 * B mag [mag]: 10.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2015) Kachuevskaya approx. diameter [km]: 11 approx. diameter ["]: .010 distance from Earth [AU]: 1.47900 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 485 number of rejected observations: 25 time covered by the observations: 1954 Jul 29 - 2008 Sep 23 1 sigma uncertainty ellipse (major, minor, PA): 0.071, 0.052, 57° remarks: * orbital elements for (2015) Kachuevskaya : Mean anomaly = 115.99053209 deg Arg. of pericenter = 273.64832433 deg Long. of node = 344.64657239 deg Inclination = 11.91562866 deg Eccentricity = 0.10419853 Semimajor axis = 2.33497609 AU Perihelion dist = 2.09167502 AU Mag: H = 12.00, G = 0.15 Epoch of elements : MJD 54754.51900000 TDT (2008 Oct 15.519) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 15 2015 Kachuevskaya 12h 26.5m UT 8.9 1 11 45.586 21 19 55.95TYC 1202-01457-1 10.2 15.6 11 0.9 1.479 -2.863 -6.35 166.9089 21.335 -10.20 -8.77 12.4414 -0.05913 0.37267 -6.72683 -1.06695 0.00026 -0.00123 2000 114.74222120081011.00000273.648324344.646572 11.9156290.10419853 2.3349761 2.091675012.4 5.00.15 RATE 2.7623610 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.072 0.055 58 6.83 0.060 0 54740.5020081015_1457-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org