IOTA/IOTA-ES occultation update for (2879) Shimizu / TYC 4686-01249-1 event on 2008 Oct 17, 05:18 UT Visible from SE Canada, E USA, Mexico Summary ------- On 2008 Oct 17 UT, the 28 km diameter asteroid (2879) Shimizu will occult a 10.1 mag star in the constellation Cetus for observers along a path across SE Canada, E USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.1 mag to 16.2 mag (the magnitude of the asteroid) for at most 2.0 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: 24 * date and approx. time of event: 2008 Oct 17, 05:12 - 2008 Oct 17, 05:25 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 6.1 * estimated maximum duration [s]: 2.0 * Moon: 92 % sunlit, 35° distance * Sun: 167° distance * rough path description: SE Canada, E USA, Mexico The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 2.82 * 1 sigma uncertainty interval [seconds]: +/- 8.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .076 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .077", .048", 78° ) * approx speed of asteroid's shadow [km/s]: 14.2109 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4686-01249-1 by 2879 Shimizu on 2008 Oct 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 -168 0 0 5 30 17 5 25 4 1 92 -8 5 39 27 5 21 9 6 31 24 .. .. .. -167 0 0 5 28 35 5 25 4 2 92 -9 5 37 44 5 19 27 6 29 41 .. .. .. -166 0 0 5 27 29 5 25 3 3 93 -10 5 36 38 5 18 21 6 28 33 .. .. .. -165 0 0 5 26 59 5 25 3 4 93 -11 5 36 8 5 17 51 6 28 2 .. .. .. -164 0 0 5 27 5 5 25 2 5 93 -12 5 36 14 5 17 57 6 28 7 .. .. .. -163 0 0 5 27 46 5 25 1 6 93 -13 5 36 55 5 18 39 6 28 49 .. .. .. -162 0 0 5 29 3 5 25 0 7 93 -14 5 38 12 5 19 56 6 30 6 4 28 44 -161 0 0 5 30 56 5 24 59 8 93 -15 5 40 5 5 21 48 6 31 59 4 30 36 -160 0 0 5 33 24 5 24 58 9 93 -16 5 42 33 5 24 16 6 34 28 4 33 3 -159 0 0 5 36 28 5 24 56 10 93 -17 5 45 37 5 27 19 6 37 32 4 36 6 -158 0 0 5 40 6 5 24 55 11 93 -18 5 49 16 5 30 58 6 41 13 4 39 43 -157 0 0 5 44 20 5 24 53 12 94 -19 5 53 30 5 35 12 6 45 29 4 43 55 -156 0 0 5 49 10 5 24 51 13 94 -20 5 58 20 5 40 1 6 50 20 4 48 42 -155 0 0 5 54 34 5 24 49 14 94 -21 6 3 44 5 45 24 6 55 47 4 54 4 -154 0 0 6 0 33 5 24 47 14 94 -21 6 9 44 5 51 23 7 1 49 5 0 0 -153 0 0 6 7 7 5 24 44 15 94 -22 6 16 18 5 57 57 7 8 27 5 6 31 -152 0 0 6 14 16 5 24 42 16 94 -23 6 23 28 6 5 5 7 15 39 5 13 36 -151 0 0 6 22 0 5 24 39 17 94 -24 6 31 12 6 12 48 7 23 27 5 21 16 -150 0 0 6 30 18 5 24 36 18 95 -25 6 39 31 6 21 6 7 31 49 5 29 30 -149 0 0 6 39 10 5 24 33 19 95 -26 6 48 24 6 29 57 7 40 47 5 38 18 -148 0 0 6 48 37 5 24 30 20 95 -27 6 57 52 6 39 24 7 50 19 5 47 40 -147 0 0 6 58 38 5 24 27 21 95 -28 7 7 54 6 49 24 8 0 25 5 57 36 -146 0 0 7 9 14 5 24 23 22 95 -29 7 18 30 6 59 59 8 11 6 6 8 6 -145 0 0 7 20 23 5 24 20 23 96 -30 7 29 40 7 11 7 8 22 22 6 19 9 -144 0 0 7 32 7 5 24 16 24 96 -31 7 41 25 7 22 49 8 34 11 6 30 46 -143 0 0 7 44 24 5 24 12 25 96 -32 7 53 43 7 35 6 8 46 35 6 42 57 -142 0 0 7 57 14 5 24 8 26 96 -33 8 6 34 7 47 55 8 59 33 6 55 41 -141 0 0 8 10 38 5 24 4 27 97 -34 8 19 59 8 1 18 9 13 4 7 8 58 -140 0 0 8 24 36 5 23 59 28 97 -35 8 33 58 8 15 14 9 27 9 7 22 48 -139 0 0 8 39 6 5 23 55 29 97 -36 8 48 30 8 29 44 9 41 48 7 37 11 -138 0 0 8 54 10 5 23 50 30 98 -37 9 3 34 8 44 46 9 56 59 7 52 6 -137 0 0 9 9 46 5 23 45 31 98 -38 9 19 12 9 0 21 10 12 44 8 7 34 -136 0 0 9 25 55 5 23 41 32 99 -39 9 35 22 9 16 29 10 29 2 8 23 35 -135 0 0 9 42 36 5 23 36 32 99 -40 9 52 5 9 33 9 10 45 52 8 40 7 -134 0 0 9 59 49 5 23 30 33 99 -41 10 9 19 9 50 21 11 3 15 8 57 12 -133 0 0 10 17 35 5 23 25 34 100 -42 10 27 6 10 8 4 11 21 10 9 14 48 -132 0 0 10 35 52 5 23 20 35 100 -43 10 45 25 10 26 20 11 39 37 9 32 55 -131 0 0 10 54 40 5 23 14 36 101 -44 11 4 15 10 45 7 11 58 36 9 51 34 -130 0 0 11 14 0 5 23 8 37 101 -45 11 23 36 11 4 25 12 18 6 10 10 44 -129 0 0 11 33 51 5 23 3 38 102 -46 11 43 28 11 24 15 12 38 7 10 30 24 -128 0 0 11 54 12 5 22 57 39 103 -47 12 3 51 11 44 34 12 58 39 10 50 35 -127 0 0 12 15 4 5 22 51 40 103 -48 12 24 45 12 5 24 13 19 42 11 11 16 -126 0 0 12 36 26 5 22 45 40 104 -49 12 46 8 12 26 44 13 41 15 11 32 27 -125 0 0 12 58 17 5 22 38 41 105 -50 13 8 1 12 48 34 14 3 18 11 54 7 -124 0 0 13 20 37 5 22 32 42 106 -51 13 30 23 13 10 53 14 25 50 12 16 16 -123 0 0 13 43 27 5 22 25 43 106 -52 13 53 15 13 33 41 14 48 52 12 38 55 -122 0 0 14 6 45 5 22 19 44 107 -53 14 16 35 13 56 57 15 12 22 13 2 1 -121 0 0 14 30 32 5 22 12 44 108 -54 14 40 23 14 20 41 15 36 21 13 25 36 -120 0 0 14 54 46 5 22 5 45 109 -55 15 4 39 14 44 54 16 0 47 13 49 38 -119 0 0 15 19 27 5 21 59 46 110 -55 15 29 22 15 9 33 16 25 41 14 14 7 -118 0 0 15 44 35 5 21 52 47 111 -56 15 54 32 15 34 39 16 51 2 14 39 3 -117 0 0 16 10 10 5 21 45 47 112 -57 16 20 8 16 0 12 17 16 50 15 4 25 -116 0 0 16 36 10 5 21 37 48 113 -58 16 46 11 16 26 10 17 43 3 15 30 13 -115 0 0 17 2 35 5 21 30 49 114 -59 17 12 38 16 52 34 18 9 42 15 56 26 -114 0 0 17 29 26 5 21 23 49 115 -60 17 39 30 17 19 22 18 36 45 16 23 3 -113 0 0 17 56 40 5 21 15 50 117 -61 18 6 47 17 46 35 19 4 13 16 50 5 -112 0 0 18 24 18 5 21 8 51 118 -61 18 34 27 18 14 11 19 32 5 17 17 30 -111 0 0 18 52 19 5 21 0 51 119 -62 19 2 30 18 42 10 20 0 19 17 45 18 -110 0 0 19 20 42 5 20 53 52 121 -63 19 30 55 19 10 31 20 28 56 18 13 29 -109 0 0 19 49 27 5 20 45 52 122 -64 19 59 42 19 39 14 20 57 54 18 42 1 -108 0 0 20 18 33 5 20 37 53 124 -64 20 28 50 20 8 18 21 27 14 19 10 54 -107 0 0 20 47 59 5 20 30 53 125 -65 20 58 18 20 37 42 21 56 53 19 40 7 -106 0 0 21 17 45 5 20 22 54 127 -66 21 28 6 21 7 26 22 26 52 20 9 40 -105 0 0 21 47 49 5 20 14 54 128 -66 21 58 12 21 37 28 22 57 10 20 39 32 -104 0 0 22 18 12 5 20 6 54 130 -67 22 28 36 22 7 49 23 27 46 21 9 41 -103 0 0 22 48 51 5 19 58 55 132 -67 22 59 18 22 38 27 23 58 39 21 40 8 -102 0 0 23 19 47 5 19 50 55 134 -68 23 30 16 23 9 21 24 29 48 22 10 52 -101 0 0 23 50 59 5 19 42 55 135 -68 24 1 29 23 40 30 25 1 12 22 41 51 -100 0 0 24 22 25 5 19 34 56 137 -68 24 32 57 24 11 54 25 32 51 23 13 5 - 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Uncertainty in time = +/- 8 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 4686-01249-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 53 23.7932 DE: -02 19 15.262 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .022 ) * V mag [mag]: 10.1 * B mag [mag]: 11.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2879) Shimizu approx. diameter [km]: 28 approx. diameter ["]: .018 distance from Earth [AU]: 2.11500 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 667 number of rejected observations: 16 time covered by the observations: 1932 Feb 14 - 2008 Sep 29 1 sigma uncertainty ellipse (major, minor, PA): 0.073, 0.043, 76° remarks: * orbital elements for (2879) Shimizu : Mean anomaly = 219.31108787 deg Arg. of pericenter = 25.95280882 deg Long. of node = 149.31841431 deg Inclination = 10.71159204 deg Eccentricity = 0.14306744 Semimajor axis = 2.76788220 AU Perihelion dist = 2.37188839 AU Mag: H = 11.84, G = 0.15 Epoch of elements : MJD 54756.22100000 TDT (2008 Oct 17.221) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 17 2879 Shimizu 5h 18.8m UT 10.1 1 53 23.793- 2 19 15.26TYC 4686-01249-1 11.4 16.2 28 2.0 2.115 -1.961 -15.78 -77.4500 -2.316 96.62 -9.39 5.3141 -0.26284 0.48931 -7.06589 -3.79601 -0.00062 0.00117 2000 217.97958320081011.00000 25.952809149.318414 10.7115920.14306744 2.7678822 2.371888411.7 5.00.15 RATE 2.1403390 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.077 0.048 78 3.82 0.051 0 54740.5020081017_1249-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 05:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org