IOTA/IOTA-ES occultation update for (1812) Gilgamesh / TYC 0765-00143-1 event on 2008 Nov 03, 17:46 UT Visible from Japan, China Summary ------- On 2008 Nov 03 UT, the 19 km diameter asteroid (1812) Gilgamesh will occult a 9.5 mag star in the constellation Canis Minor for observers along a path across Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.8 mag to 16.3 mag (the magnitude of the asteroid) for at most 2.2 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: 18 * date and approx. time of event: 2008 Nov 03, 17:34 - 2008 Nov 03, 17:50 UT * magnitude of target star: 9.5 * magnitude drop [mag]: 6.8 * estimated maximum duration [s]: 2.2 * Moon: 28 % sunlit, 163° distance * Sun: 107° distance * rough path description: Japan, China Additional comments ------------------- 4.8" double star The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 3.83 * 1 sigma uncertainty interval [seconds]: +/- 8.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .048 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .048", .038", 92° ) * approx speed of asteroid's shadow [km/s]: 8.9111 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0765-00143-1 by 1812 Gilgamesh 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude 176 0 0 - 6 30 51 17 50 47 69 319 0 - 6 37 47 - 6 23 55 - 7 30 52 - 5 30 54 175 0 0 - 5 37 2 17 50 31 71 320 -2 - 5 43 58 - 5 30 7 - 6 37 6 - 4 37 3 174 0 0 - 4 43 5 17 50 14 72 321 -3 - 4 50 1 - 4 36 9 - 5 43 10 - 3 43 3 173 0 0 - 3 49 0 17 49 57 73 322 -4 - 3 55 56 - 3 42 4 - 4 49 7 - 2 48 58 172 0 0 - 2 54 52 17 49 41 75 323 -5 - 3 1 49 - 2 47 56 - 3 54 59 - 1 54 50 171 0 0 - 2 0 44 17 49 24 76 324 -7 - 2 7 40 - 1 53 48 - 3 0 49 - 1 0 43 170 0 0 - 1 6 38 17 49 7 78 326 -8 - 1 13 34 - 0 59 42 - 2 6 40 - 0 6 40 169 0 0 - 0 12 37 17 48 50 79 328 -9 - 0 19 33 - 0 5 42 - 1 12 36 0 47 17 168 0 0 0 41 15 17 48 32 80 330 -11 0 34 20 0 48 10 - 0 18 40 1 41 5 167 0 0 1 34 56 17 48 15 81 334 -12 1 28 1 1 41 50 0 35 7 2 34 40 166 0 0 2 28 22 17 47 58 83 338 -13 2 21 29 2 35 15 1 28 40 3 27 59 165 0 0 3 21 32 17 47 41 84 344 -14 3 14 39 3 28 24 2 21 57 4 21 1 164 0 0 4 14 21 17 47 24 85 353 -16 4 7 30 4 21 13 3 14 55 5 13 42 163 0 0 5 6 48 17 47 6 86 7 -17 4 59 58 5 13 39 4 7 32 6 6 0 162 0 0 5 58 51 17 46 49 86 25 -18 5 52 1 6 5 40 4 59 45 6 57 51 161 0 0 6 50 25 17 46 32 86 47 -19 6 43 37 6 57 13 5 51 31 7 49 15 160 0 0 7 41 30 17 46 15 86 67 -21 7 34 44 7 48 17 6 42 48 8 40 7 159 0 0 8 32 3 17 45 58 85 81 -22 8 25 18 8 38 48 7 33 33 9 30 27 158 0 0 9 22 1 17 45 42 84 91 -23 9 15 18 9 28 45 8 23 45 10 20 12 157 0 0 10 11 24 17 45 25 83 97 -24 10 4 42 10 18 5 9 13 22 11 9 20 156 0 0 11 0 8 17 45 9 82 102 -25 10 53 28 11 6 48 10 2 21 11 57 50 155 0 0 11 48 13 17 44 52 81 105 -27 11 41 34 11 54 51 10 50 41 12 45 39 154 0 0 12 35 36 17 44 36 79 107 -28 12 29 0 12 42 12 11 38 20 13 32 46 153 0 0 13 22 17 17 44 20 78 109 -29 13 15 42 13 28 51 12 25 17 14 19 10 152 0 0 14 8 13 17 44 5 77 111 -30 14 1 41 14 14 46 13 11 31 15 4 50 151 0 0 14 53 24 17 43 49 76 112 -31 14 46 54 14 59 55 13 56 59 15 49 44 150 0 0 15 37 49 17 43 34 75 113 -32 15 31 21 15 44 18 14 41 41 16 33 51 149 0 0 16 21 27 17 43 19 73 113 -33 16 15 0 16 27 53 15 25 37 17 17 11 148 0 0 17 4 17 17 43 4 72 114 -35 16 57 52 17 10 41 16 8 44 17 59 43 147 0 0 17 46 18 17 42 50 71 114 -36 17 39 55 17 52 40 16 51 4 18 41 26 146 0 0 18 27 29 17 42 35 70 114 -37 18 21 9 18 33 49 17 32 33 19 22 20 145 0 0 19 7 51 17 42 21 69 115 -38 19 1 33 19 14 9 18 13 14 20 2 23 144 0 0 19 47 23 17 42 7 67 115 -39 19 41 7 19 53 39 18 53 4 20 41 36 143 0 0 20 26 4 17 41 54 66 115 -40 20 19 50 20 32 18 19 32 3 21 19 59 142 0 0 21 3 54 17 41 40 65 115 -41 20 57 43 21 10 6 20 10 12 21 57 32 141 0 0 21 40 54 17 41 27 64 115 -42 21 34 45 21 47 4 20 47 30 22 34 13 140 0 0 22 17 3 17 41 14 63 114 -43 22 10 56 22 23 11 21 23 57 23 10 4 139 0 0 22 52 21 17 41 2 62 114 -44 22 46 16 22 58 27 21 59 34 23 45 4 138 0 0 23 26 49 17 40 50 60 114 -45 23 20 45 23 32 52 22 34 19 24 19 14 137 0 0 24 0 26 17 40 38 59 114 -46 23 54 24 24 6 27 23 8 14 24 52 33 136 0 0 24 33 12 17 40 26 58 114 -47 24 27 13 24 39 11 23 41 18 25 25 2 135 0 0 25 5 9 17 40 14 57 113 -48 24 59 11 25 11 6 24 13 31 25 56 41 134 0 0 25 36 15 17 40 3 56 113 -48 25 30 20 25 42 10 24 44 55 26 27 30 133 0 0 26 6 32 17 39 52 55 113 -49 26 0 39 26 12 26 25 15 29 26 57 31 132 0 0 26 36 0 17 39 41 54 112 -50 26 30 9 26 41 52 25 45 14 27 26 42 131 0 0 27 4 39 17 39 31 53 112 -51 26 58 50 27 10 29 26 14 9 27 55 5 130 0 0 27 32 30 17 39 20 52 112 -52 27 26 42 27 38 18 26 42 16 28 22 40 129 0 0 27 59 33 17 39 10 51 111 -53 27 53 47 28 5 19 27 9 35 28 49 27 128 0 0 28 25 49 17 39 1 50 111 -54 28 20 5 28 31 33 27 36 6 29 15 28 127 0 0 28 51 17 17 38 51 49 111 -54 28 45 35 28 57 0 28 1 49 29 40 41 126 0 0 29 16 0 17 38 42 48 110 -55 29 10 19 29 21 40 28 26 46 30 5 9 125 0 0 29 39 56 17 38 33 47 110 -56 29 34 17 29 45 35 28 50 57 30 28 51 124 0 0 30 3 6 17 38 24 46 109 -57 29 57 29 30 8 44 29 14 22 30 51 48 123 0 0 30 25 32 17 38 15 45 109 -57 30 19 56 30 31 8 29 37 1 31 14 0 122 0 0 30 47 13 17 38 7 44 108 -58 30 41 39 30 52 48 29 58 55 31 35 28 121 0 0 31 8 11 17 37 58 43 108 -59 31 2 38 31 13 44 30 20 6 31 56 12 120 0 0 31 28 25 17 37 50 42 107 -59 31 22 53 31 33 56 30 40 32 32 16 14 119 0 0 31 47 56 17 37 43 41 107 -60 31 42 25 31 53 26 31 0 15 32 35 33 118 0 0 32 6 44 17 37 35 40 106 -61 32 1 15 32 12 13 31 19 15 32 54 9 117 0 0 32 24 51 17 37 28 39 106 -61 32 19 23 32 30 18 31 37 33 33 12 4 116 0 0 32 42 16 17 37 20 38 105 -62 32 36 49 32 47 42 31 55 9 33 29 19 115 0 0 32 59 0 17 37 13 37 105 -62 32 53 35 33 4 24 32 12 4 33 45 52 114 0 0 33 15 3 17 37 7 37 104 -63 33 9 39 33 20 27 32 28 17 34 1 45 113 0 0 33 30 26 17 37 0 36 104 -63 33 25 4 33 35 49 32 43 51 34 16 59 112 0 0 33 45 10 17 36 54 35 103 -64 33 39 49 33 50 32 32 58 44 34 31 33 111 0 0 33 59 15 17 36 47 34 103 -64 33 53 54 34 4 35 33 12 57 34 45 29 110 0 0 34 12 40 17 36 41 33 102 -65 34 7 21 34 18 0 33 26 32 34 58 46 109 0 0 34 25 28 17 36 35 32 102 -65 34 20 9 34 30 46 33 39 27 35 11 25 108 0 0 34 37 37 17 36 30 31 101 -66 34 32 19 34 42 55 33 51 45 35 23 27 107 0 0 34 49 9 17 36 24 30 100 -66 34 43 52 34 54 26 34 3 24 35 34 51 106 0 0 35 0 3 17 36 19 30 100 -67 34 54 47 35 5 19 34 14 25 35 45 38 105 0 0 35 10 21 17 36 14 29 99 -67 35 5 6 35 15 36 34 24 50 35 55 49 104 0 0 35 20 2 17 36 9 28 99 -67 35 14 47 35 25 16 34 34 37 36 5 24 103 0 0 35 29 7 17 36 4 27 98 -68 35 23 53 35 34 20 34 43 48 36 14 23 102 0 0 35 37 35 17 35 59 26 98 -68 35 32 22 35 42 49 34 52 22 36 22 46 101 0 0 35 45 28 17 35 54 25 97 -68 35 40 16 35 50 41 35 0 20 36 30 34 100 0 0 35 52 46 17 35 50 25 96 -68 35 47 34 35 57 58 35 7 43 36 37 47 99 0 0 35 59 29 17 35 46 24 96 -68 35 54 17 36 4 40 35 14 30 36 44 25 98 0 0 36 5 37 17 35 42 23 95 -69 36 0 25 36 10 48 35 20 42 36 50 29 97 0 0 36 11 10 17 35 38 22 95 -69 36 5 59 36 16 20 35 26 18 36 55 58 96 0 0 36 16 8 17 35 34 21 94 -69 36 10 58 36 21 18 35 31 20 37 0 54 95 0 0 36 20 32 17 35 30 20 93 -69 36 15 23 36 25 42 35 35 47 37 5 15 94 0 0 36 24 23 17 35 27 20 93 -69 36 19 13 36 29 32 35 39 40 37 9 3 93 0 0 36 27 39 17 35 23 19 92 -69 36 22 30 36 32 48 35 42 59 37 12 17 92 0 0 36 30 21 17 35 20 18 92 -69 36 25 12 36 35 31 35 45 43 37 14 57 91 0 0 36 32 30 17 35 17 17 91 -69 36 27 21 36 37 39 35 47 53 37 17 5 90 0 0 36 34 6 17 35 14 16 91 -69 36 28 57 36 39 15 35 49 30 37 18 39 89 0 0 36 35 8 17 35 11 15 90 -69 36 29 59 36 40 16 35 50 33 37 19 40 88 0 0 36 35 36 17 35 9 15 89 -68 36 30 27 36 40 45 35 51 1 37 20 9 87 0 0 36 35 31 17 35 6 14 89 -68 36 30 23 36 40 40 35 50 57 37 20 4 86 0 0 36 34 54 17 35 4 13 88 -68 36 29 45 36 40 2 35 50 19 37 19 26 85 0 0 36 33 42 17 35 2 12 88 -68 36 28 34 36 38 51 35 49 7 37 18 16 84 0 0 36 31 58 17 35 0 11 87 -68 36 26 49 36 37 7 35 47 22 37 16 33 83 0 0 36 29 41 17 34 58 11 86 -67 36 24 32 36 34 50 35 45 3 37 14 17 82 0 0 36 26 50 17 34 56 10 86 -67 36 21 41 36 32 0 35 42 11 37 11 28 81 0 0 36 23 27 17 34 54 9 85 -67 36 18 17 36 28 36 35 38 45 37 8 6 80 0 0 36 19 30 17 34 53 8 85 -66 36 14 20 36 24 40 35 34 46 37 4 12 79 0 0 36 15 0 17 34 51 7 84 -66 36 9 50 36 20 10 35 30 13 36 59 45 78 0 0 36 9 56 17 34 50 7 83 -66 36 4 46 36 15 7 35 25 6 36 54 44 77 0 0 36 4 20 17 34 49 6 83 -65 35 59 9 36 9 31 35 19 26 36 49 11 76 0 0 35 58 10 17 34 48 5 82 -65 35 52 58 36 3 21 35 13 12 36 43 5 75 0 0 35 51 26 17 34 47 4 82 -64 35 46 14 35 56 38 35 6 25 36 36 25 74 0 0 35 44 9 17 34 46 3 81 -64 35 38 56 35 49 21 34 59 3 36 29 12 73 0 0 35 36 18 17 34 46 2 80 -63 35 31 5 35 41 31 34 51 7 36 21 26 72 0 0 35 27 53 17 34 46 2 80 -63 35 22 39 35 33 6 34 42 37 36 13 6 71 0 0 35 18 54 17 34 45 1 79 -62 35 13 40 35 24 8 34 33 33 36 4 13 Uncertainty in time = +/- 9 secs [Prediction of 2008 Oct 30.0] Data for the target star ------------------------ * name: TYC 0765-00143-1 * constellation : Canis Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 33 56.9684 DE: +09 12 41.339 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .021 ) * V mag [mag]: 9.5 * B mag [mag]: 10.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1812) Gilgamesh approx. diameter [km]: 19 approx. diameter ["]: .011 distance from Earth [AU]: 2.30300 * orbital information: orbit source: Preston date of fit: 2008 Oct 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 833 number of rejected observations: 21 time covered by the observations: 1931 Jan 13 - 2008 Oct 25 1 sigma uncertainty ellipse (major, minor, PA): 0.043, 0.032, 93° remarks: * orbital elements for (1812) Gilgamesh : Mean anomaly = 8.43297316 deg Arg. of pericenter = 264.69829069 deg Long. of node = 178.72454627 deg Inclination = 10.25941787 deg Eccentricity = 0.08136718 Semimajor axis = 3.00745845 AU Perihelion dist = 2.76275003 AU Mag: H = 11.40, G = 0.15 Epoch of elements : MJD 54773.74100000 TDT (2008 Nov 03.741) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Nov 3 1812 Gilgamesh 17h 46.7m UT 9.5 7 33 56.968 9 12 41.34TYC 0765-00143-1 10.7 16.3 19 2.2 2.303 1.007 -12.09 163.4673 9.215 -90.77 -15.34 17.7776 -0.03775 -0.04791 3.90792 -3.16639 -0.00543 0.00129 2000 7.72601720081031.00000264.698291178.724546 10.2594180.08136718 3.0074585 2.762750011.3 5.00.15 RATE 1.8897510 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.048 0.038 92 4.83 0.044 0 54769.5020081103_0143-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 30, 13:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org