IOTA/IOTA-ES occultation update for (2249) Yamamoto / TYC 1380-00999-1 event on 2008 Nov 03, 04:37 UT Visible from N Africa, Spain, Portugal, SE USA Summary ------- On 2008 Nov 03 UT, the 45 km diameter asteroid (2249) Yamamoto will occult a 10.9 mag star in the constellation Cancer for observers along a path across N Africa, Spain, Portugal, SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.1 mag to 17.0 mag (the magnitude of the asteroid) for at most 5.4 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: 33 * date and approx. time of event: 2008 Nov 03, 04:25 - 2008 Nov 03, 04:39 UT * midpoint of event [JD]: 2454773.69275833 * magnitude of target star: 10.9 * magnitude drop [mag]: 6.1 * estimated maximum duration [s]: 5.4 * Moon: 23 % sunlit, 158° distance * Sun: 102° distance * rough path description: N Africa, Spain, Portugal, SE USA The occultation path -------------------- * approximate projected width [km]: 47 * 1 sigma uncertainty interval [path widths]: +/- 2.00 * 1 sigma uncertainty interval [seconds]: +/- 13.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .053", .040", 97° ) * approx speed of asteroid's shadow [km/s]: 8.2792 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1380-00999-1 by 2249 Yamamoto on 2008 Nov 3 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 - 89 0 0 31 2 11 4 25 15 0 70 -67 30 48 36 31 15 47 .. .. .. 32 10 20 - 88 0 0 31 20 55 4 25 15 1 71 -67 31 7 22 31 34 29 .. .. .. 32 28 57 - 87 0 0 31 39 21 4 25 15 2 71 -68 31 25 49 31 52 54 .. .. .. 32 47 16 - 86 0 0 31 57 28 4 25 16 3 72 -68 31 43 57 32 11 0 30 50 4 33 5 17 - 85 0 0 32 15 17 4 25 17 4 72 -68 32 1 48 32 28 47 31 8 0 33 22 59 - 84 0 0 32 32 47 4 25 18 5 73 -69 32 19 19 32 46 16 31 25 37 33 40 22 - 83 0 0 32 49 58 4 25 19 6 73 -69 32 36 32 33 3 26 31 42 55 33 57 27 - 82 0 0 33 6 50 4 25 20 6 74 -69 32 53 25 33 20 17 31 59 53 34 14 12 - 81 0 0 33 23 23 4 25 21 7 74 -69 33 9 59 33 36 48 32 16 33 34 30 37 - 80 0 0 33 39 36 4 25 23 8 75 -70 33 26 14 33 53 0 32 32 53 34 46 44 - 79 0 0 33 55 30 4 25 25 9 75 -70 33 42 8 34 8 52 32 48 53 35 2 30 - 78 0 0 34 11 3 4 25 27 10 76 -70 33 57 44 34 24 24 33 4 34 35 17 57 - 77 0 0 34 26 17 4 25 29 11 77 -70 34 12 59 34 39 37 33 19 55 35 33 4 - 76 0 0 34 41 11 4 25 32 12 77 -70 34 27 54 34 54 29 33 34 55 35 47 50 - 75 0 0 34 55 45 4 25 34 13 78 -70 34 42 29 35 9 1 33 49 36 36 2 17 - 74 0 0 35 9 58 4 25 37 13 78 -70 34 56 44 35 23 13 34 3 56 36 16 24 - 73 0 0 35 23 51 4 25 40 14 79 -70 35 10 38 35 37 5 34 17 56 36 30 10 - 72 0 0 35 37 24 4 25 43 15 79 -70 35 24 12 35 50 36 34 31 35 36 43 35 - 71 0 0 35 50 36 4 25 46 16 80 -69 35 37 26 36 3 47 34 44 54 36 56 41 - 70 0 0 36 3 27 4 25 49 17 81 -69 35 50 18 36 16 37 34 57 52 37 9 25 - 69 0 0 36 15 58 4 25 53 18 81 -69 36 2 51 36 29 7 35 10 29 37 21 50 - 68 0 0 36 28 8 4 25 57 18 82 -69 36 15 2 36 41 15 35 22 46 37 33 53 - 67 0 0 36 39 58 4 26 0 19 83 -68 36 26 53 36 53 3 35 34 42 37 45 36 - 66 0 0 36 51 26 4 26 4 20 83 -68 36 38 22 37 4 31 35 46 16 37 56 58 - 65 0 0 37 2 34 4 26 9 21 84 -68 36 49 31 37 15 37 35 57 30 38 8 0 - 64 0 0 37 13 21 4 26 13 22 85 -67 37 0 19 37 26 23 36 8 23 38 18 40 - 63 0 0 37 23 46 4 26 17 23 85 -67 37 10 46 37 36 47 36 18 55 38 29 0 - 62 0 0 37 33 51 4 26 22 23 86 -66 37 20 52 37 46 51 36 29 5 38 38 59 - 61 0 0 37 43 35 4 26 26 24 86 -66 37 30 37 37 56 34 36 38 55 38 48 37 - 60 0 0 37 52 58 4 26 31 25 87 -65 37 40 1 38 5 55 36 48 23 38 57 54 - 59 0 0 38 2 0 4 26 36 26 88 -65 37 49 4 38 14 56 36 57 31 39 6 50 - 58 0 0 38 10 40 4 26 41 27 89 -64 37 57 46 38 23 36 37 6 17 39 15 26 - 57 0 0 38 19 0 4 26 46 27 89 -64 38 6 7 38 31 54 37 14 41 39 23 40 - 56 0 0 38 26 59 4 26 52 28 90 -63 38 14 6 38 39 52 37 22 45 39 31 34 - 55 0 0 38 34 36 4 26 57 29 91 -63 38 21 45 38 47 29 37 30 27 39 39 7 - 54 0 0 38 41 53 4 27 3 30 91 -62 38 29 2 38 54 44 37 37 48 39 46 18 - 53 0 0 38 48 48 4 27 9 31 92 -62 38 35 58 39 1 38 37 44 48 39 53 9 - 52 0 0 38 55 22 4 27 14 31 93 -61 38 42 33 39 8 12 37 51 26 39 59 39 - 51 0 0 39 1 35 4 27 20 32 94 -60 38 48 47 39 14 24 37 57 43 40 5 48 - 50 0 0 39 7 27 4 27 26 33 94 -60 38 54 40 39 20 15 38 3 39 40 11 36 - 49 0 0 39 12 58 4 27 33 34 95 -59 39 0 11 39 25 45 38 9 13 40 17 3 - 48 0 0 39 18 7 4 27 39 35 96 -59 39 5 22 39 30 54 38 14 27 40 22 9 - 47 0 0 39 22 56 4 27 45 35 97 -58 39 10 11 39 35 42 38 19 18 40 26 54 - 46 0 0 39 27 23 4 27 52 36 97 -57 39 14 39 39 40 9 38 23 49 40 31 18 - 45 0 0 39 31 29 4 27 59 37 98 -57 39 18 45 39 44 14 38 27 58 40 35 22 - 44 0 0 39 35 14 4 28 5 38 99 -56 39 22 31 39 47 59 38 31 45 40 39 4 - 43 0 0 39 38 38 4 28 12 39 100 -55 39 25 55 39 51 22 38 35 11 40 42 25 - 42 0 0 39 41 41 4 28 19 39 100 -55 39 28 58 39 54 24 38 38 16 40 45 26 - 41 0 0 39 44 22 4 28 26 40 101 -54 39 31 40 39 57 5 38 41 0 40 48 5 - 40 0 0 39 46 42 4 28 34 41 102 -53 39 34 1 39 59 25 38 43 22 40 50 23 - 39 0 0 39 48 41 4 28 41 42 103 -53 39 36 0 40 1 24 38 45 22 40 52 21 - 38 0 0 39 50 19 4 28 48 42 104 -52 39 37 38 40 3 1 38 47 1 40 53 57 - 37 0 0 39 51 35 4 28 56 43 105 -51 39 38 54 40 4 17 38 48 19 40 55 13 - 36 0 0 39 52 31 4 29 4 44 106 -51 39 39 50 40 5 12 38 49 14 40 56 7 - 35 0 0 39 53 4 4 29 11 45 106 -50 39 40 24 40 5 46 38 49 49 40 56 40 - 34 0 0 39 53 17 4 29 19 45 107 -49 39 40 36 40 5 58 38 50 2 40 56 52 - 33 0 0 39 53 8 4 29 27 46 108 -48 39 40 27 40 5 49 38 49 53 40 56 43 - 32 0 0 39 52 38 4 29 35 47 109 -48 39 39 57 40 5 19 38 49 23 40 56 13 - 31 0 0 39 51 46 4 29 44 48 110 -47 39 39 5 40 4 27 38 48 31 40 55 22 - 30 0 0 39 50 33 4 29 52 48 111 -46 39 37 52 40 3 14 38 47 17 40 54 9 - 29 0 0 39 48 58 4 30 0 49 112 -45 39 36 17 40 1 40 38 45 41 40 52 35 - 28 0 0 39 47 2 4 30 9 50 113 -45 39 34 21 39 59 44 38 43 44 40 50 40 - 27 0 0 39 44 44 4 30 17 51 114 -44 39 32 3 39 57 26 38 41 25 40 48 24 - 26 0 0 39 42 5 4 30 26 51 115 -43 39 29 23 39 54 47 38 38 44 40 45 46 - 25 0 0 39 39 4 4 30 35 52 116 -43 39 26 22 39 51 47 38 35 42 40 42 47 - 24 0 0 39 35 41 4 30 44 53 117 -42 39 22 59 39 48 25 38 32 17 40 39 26 - 23 0 0 39 31 57 4 30 53 54 118 -41 39 19 14 39 44 41 38 28 30 40 35 44 - 22 0 0 39 27 51 4 31 2 54 119 -40 39 15 7 39 40 35 38 24 22 40 31 40 - 21 0 0 39 23 23 4 31 11 55 120 -40 39 10 39 39 36 7 38 19 51 40 27 15 - 20 0 0 39 18 33 4 31 21 56 122 -39 39 5 48 39 31 18 38 14 58 40 22 28 - 19 0 0 39 13 21 4 31 30 57 123 -38 39 0 36 39 26 7 38 9 43 40 17 19 - 18 0 0 39 7 47 4 31 40 57 124 -37 38 55 1 39 20 34 38 4 6 40 11 49 - 17 0 0 39 1 51 4 31 49 58 125 -36 38 49 4 39 14 38 37 58 6 40 5 56 - 16 0 0 38 55 33 4 31 59 59 127 -36 38 42 46 39 8 21 37 51 44 39 59 42 - 15 0 0 38 48 53 4 32 9 59 128 -35 38 36 5 39 1 42 37 45 0 39 53 6 - 14 0 0 38 41 50 4 32 19 60 129 -34 38 29 1 38 54 40 37 37 53 39 46 8 - 13 0 0 38 34 26 4 32 29 61 131 -33 38 21 36 38 47 16 37 30 24 39 38 48 - 12 0 0 38 26 39 4 32 39 62 132 -32 38 13 48 38 39 30 37 22 32 39 31 6 - 11 0 0 38 18 29 4 32 49 62 134 -32 38 5 37 38 31 22 37 14 18 39 23 1 - 10 0 0 38 9 57 4 33 0 63 135 -31 37 57 5 38 22 51 37 5 41 39 14 35 - 9 0 0 38 1 3 4 33 10 64 137 -30 37 48 9 38 13 58 36 56 41 39 5 46 - 8 0 0 37 51 46 4 33 21 64 138 -29 37 38 51 38 4 42 36 47 19 38 56 35 - 7 0 0 37 42 7 4 33 31 65 140 -28 37 29 11 37 55 4 36 37 34 38 47 1 - 6 0 0 37 32 5 4 33 42 66 142 -28 37 19 7 37 45 3 36 27 26 38 37 5 - 5 0 0 37 21 40 4 33 53 66 144 -27 37 8 42 37 34 40 36 16 55 38 26 46 - 4 0 0 37 10 53 4 34 4 67 146 -26 36 57 53 37 23 53 36 6 2 38 16 5 - 3 0 0 36 59 43 4 34 15 67 148 -25 36 46 41 37 12 45 35 54 45 38 5 2 - 2 0 0 36 48 10 4 34 26 68 150 -24 36 35 7 37 1 13 35 43 5 37 53 35 - 1 0 0 36 36 14 4 34 37 69 152 -23 36 23 10 36 49 18 35 31 3 37 41 46 0 0 0 36 23 55 4 34 49 69 155 -23 36 10 50 36 37 1 35 18 37 37 29 35 1 0 0 36 11 14 4 35 0 70 157 -22 35 58 7 36 24 21 35 5 49 37 17 0 2 0 0 35 58 9 4 35 12 70 160 -21 35 45 1 36 11 18 34 52 37 37 4 3 3 0 0 35 44 42 4 35 23 71 162 -20 35 31 32 35 57 52 34 39 3 36 50 43 4 0 0 35 30 52 4 35 35 71 165 -19 35 17 41 35 44 4 34 25 5 36 37 1 5 0 0 35 16 39 4 35 47 72 168 -18 35 3 26 35 29 52 34 10 45 36 22 56 6 0 0 35 2 3 4 35 59 72 171 -17 34 48 49 35 15 18 33 56 1 36 8 28 7 0 0 34 47 5 4 36 11 72 174 -17 34 33 49 35 0 21 33 40 55 35 53 37 8 0 0 34 31 43 4 36 23 73 178 -16 34 18 26 34 45 1 33 25 26 35 38 23 9 0 0 34 15 59 4 36 35 73 181 -15 34 2 40 34 29 19 33 9 34 35 22 47 10 0 0 33 59 52 4 36 47 73 185 -14 33 46 32 34 13 14 32 53 19 35 6 49 11 0 0 33 43 23 4 36 59 73 188 -13 33 30 1 33 56 46 32 36 42 34 50 27 12 0 0 33 26 31 4 37 12 73 192 -12 33 13 7 33 39 56 32 19 42 34 33 44 13 0 0 33 9 17 4 37 24 73 196 -11 32 55 52 33 22 43 32 2 19 34 16 38 14 0 0 32 51 40 4 37 37 73 199 -10 32 38 13 33 5 8 31 44 35 33 59 9 15 0 0 32 33 42 4 37 49 73 203 -9 32 20 13 32 47 11 31 26 28 33 41 19 16 0 0 32 15 21 4 38 2 73 207 -8 32 1 51 32 28 52 31 7 59 33 23 7 17 0 0 31 56 38 4 38 15 73 211 -7 31 43 6 32 10 11 30 49 8 33 4 32 18 0 0 31 37 34 4 38 27 73 214 -6 31 24 0 31 51 8 30 29 56 32 45 36 19 0 0 31 18 8 4 38 40 73 218 -5 31 4 33 31 31 44 30 10 22 32 26 18 20 0 0 30 58 21 4 38 53 72 221 -5 30 44 44 31 11 59 29 50 27 32 6 39 21 0 0 30 38 13 4 39 6 72 225 -4 30 24 34 30 51 52 29 30 11 31 46 39 22 0 0 30 17 44 4 39 19 72 228 -3 30 4 4 30 31 25 29 9 34 31 26 18 23 0 0 29 56 54 4 39 32 71 231 -2 29 43 13 30 10 37 28 48 37 31 5 37 24 0 0 29 35 44 4 39 45 71 234 -1 29 22 1 29 49 28 28 27 19 30 44 35 Uncertainty in time = +/- 14 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 1380-00999-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 01 55.2374 DE: +17 10 27.854 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .022 ) * V mag [mag]: 10.9 * B mag [mag]: 11.8 * Apparent position with proper motion RA(deg): 120.6112167096 DE(deg): 17.1503679545 * Equation of equinoxes (radians) : 0.000047878300758 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2249) Yamamoto approx. diameter [km]: 45 approx. diameter ["]: .020 distance from Earth [AU]: 3.09400 * orbital information: orbit source: Preston date of fit: 2008 Aug 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 992 number of rejected observations: 30 time covered by the observations: 1942 Apr 06 - 2008 Mar 11 1 sigma uncertainty ellipse (major, minor, PA): 0.049, 0.033, 98° remarks: * orbital elements for (2249) Yamamoto : Mean anomaly = 209.10497464 deg Arg. of pericenter = 109.84356480 deg Long. of node = 148.07522633 deg Inclination = 4.09240317 deg Eccentricity = 0.08800959 Semimajor axis = 3.18805899 AU Perihelion dist = 2.90747924 AU Mag: H = 11.06, G = 0.15 Epoch of elements : MJD 54773.19300000 TDT (2008 Nov 03.193) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Nov 3 2249 Yamamoto 4h 37.6m UT 10.9 8 1 55.237 17 10 27.85TYC 1380-00999-1 11.8 17.0 45 5.4 3.094 0.890 -3.68 8.2719 17.176 106.50 -15.17 4.6262 0.07921 0.26961 4.48975 -1.29588 -0.00572 0.00126 2000 208.55211720081031.00000109.843565148.075226 4.0924030.08800959 3.1880590 2.907479211.0 5.00.15 RATE 1.7314680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.053 0.040 97 3.00 0.040 0 54740.5020081103_0999-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 23:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org