IOTA/IOTA-ES occultation update for (2787) Tovarishch / TYC 7385-00763-1 event on 2008 Jun 01, 21:34 UT Visible from Antarctica Summary ------- On 2008 Jun 01 UT, the 18 km diameter asteroid (2787) Tovarishch will occult a 9.8 mag star in the constellation Scorpius for observers along a path across Antarctica. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.2 mag to 16.0 mag (the magnitude of the asteroid) for at most 1.4 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: 12 * date and approx. time of event: 2008 Jun 01, 21:30 - 2008 Jun 01, 21:40 UT * midpoint of event [JD]: 2454619.39918333 * magnitude of target star: 9.8 * magnitude drop [mag]: 6.2 * estimated maximum duration [s]: 1.4 * Moon: 5 % sunlit, 138° distance * Sun: 161° distance * rough path description: Antarctica The occultation path -------------------- * approximate projected width [km]: 28 * 1 sigma uncertainty interval [path widths]: +/- 5.61 * 1 sigma uncertainty interval [seconds]: +/- 10.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .100 +/- .057) * 1 sigma uncertainty ellipse (major, minor, PA): ( .100", .057", 97° ) * approx speed of asteroid's shadow [km/s]: 12.6065 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7385-00763-1 by 2787 Tovarishch on 2008 Jun 1 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 149 43 35 -44 10 58 21 30 8 20 240 0 149 59 37 -44 7 31 149 27 40 -44 14 19 153 7 57 -43 21 22 146 35 47 -44 46 0 148 18 38 -45 37 9 21 30 16 21 241 -2 148 34 15 -45 34 15 148 3 7 -45 39 57 151 36 20 -44 55 36 145 14 50 -46 6 24 146 59 12 -46 58 40 21 30 25 23 242 -3 147 14 31 -46 56 14 146 43 57 -47 1 3 150 12 28 -46 23 28 143 58 2 -47 23 9 145 44 7 -48 16 27 21 30 33 24 243 -5 145 59 16 -48 14 23 145 29 2 -48 18 27 148 54 33 -47 46 25 142 44 34 -48 36 52 144 32 34 -49 31 6 21 30 41 25 245 -6 144 47 37 -49 29 21 144 17 35 -49 32 48 147 41 18 -49 5 25 141 33 49 -49 48 1 143 23 55 -50 43 9 21 30 49 26 246 -7 143 38 55 -50 41 41 143 8 58 -50 44 34 146 31 51 -50 21 12 140 25 20 -50 56 59 142 17 39 -51 52 57 21 30 58 27 247 -8 142 32 41 -51 51 43 142 2 41 -51 54 7 145 25 32 -51 34 16 139 18 41 -52 4 1 141 13 24 -53 0 49 21 31 6 28 248 -9 141 28 30 -52 59 48 140 58 22 -53 1 46 144 21 50 -52 45 2 138 13 34 -53 9 23 140 10 50 -54 6 59 21 31 14 29 250 -10 140 26 1 -54 6 10 139 55 42 -54 7 44 143 20 21 -53 53 48 137 9 42 -54 13 15 139 9 39 -55 11 39 21 31 23 30 251 -11 139 24 58 -55 11 2 138 54 23 -55 12 14 142 20 44 -55 0 51 136 6 50 -55 15 48 138 9 37 -56 15 0 21 31 31 31 252 -12 138 25 6 -56 14 33 137 54 11 -56 15 24 141 22 44 -56 6 23 135 4 45 -56 17 10 137 10 32 -57 17 10 21 31 39 32 253 -13 137 26 14 -57 16 52 136 54 54 -57 17 25 140 26 5 -57 10 35 134 3 16 -57 17 28 136 12 12 -58 18 16 21 31 47 33 255 -14 136 28 8 -58 18 8 135 56 20 -58 18 22 139 30 37 -58 13 35 133 2 11 -58 16 48 135 14 27 -59 18 25 21 31 56 33 256 -15 135 30 38 -59 18 25 134 58 20 -59 18 23 138 36 8 -59 15 32 132 1 20 -59 15 15 134 17 6 -60 17 43 21 32 4 34 258 -15 134 33 35 -60 17 51 134 0 41 -60 17 32 137 42 28 -60 16 31 131 0 32 -60 12 55 133 20 1 -61 16 13 21 32 12 35 259 -16 133 36 49 -61 16 29 133 3 17 -61 15 55 136 49 28 -61 16 39 129 59 38 -61 9 51 132 23 2 -62 14 2 21 32 21 35 260 -17 132 40 11 -62 14 25 132 5 56 -62 13 36 135 57 0 -62 16 2 128 58 28 -62 6 7 131 25 59 -63 11 12 21 32 29 36 262 -17 131 43 32 -63 11 43 131 8 30 -63 10 38 135 4 57 -63 14 42 127 56 52 -63 1 46 130 28 43 -64 7 47 21 32 37 36 263 -18 130 46 42 -64 8 25 130 10 48 -64 7 6 134 13 10 -64 12 46 126 54 38 -63 56 52 129 31 5 -65 3 50 21 32 45 37 265 -19 129 49 32 -65 4 36 129 12 42 -65 3 2 133 21 32 -65 10 16 125 51 36 -64 51 26 128 32 54 -65 59 24 21 32 54 37 266 -19 128 51 52 -66 0 17 128 14 1 -65 58 29 132 29 54 -66 7 16 124 47 33 -65 45 32 127 33 59 -66 54 32 21 33 2 38 268 -20 127 53 30 -66 55 32 127 14 33 -66 53 30 131 38 10 -67 3 48 123 42 17 -66 39 11 126 34 8 -67 49 16 21 33 10 38 269 -20 126 54 16 -67 50 23 126 14 6 -67 48 7 130 46 10 -67 59 57 122 35 31 -67 32 26 125 33 8 -68 43 39 21 33 18 38 271 -21 125 53 56 -68 44 53 125 12 26 -68 42 22 129 53 45 -68 55 44 121 27 2 -68 25 18 124 30 43 -69 37 41 21 33 27 39 273 -21 124 52 14 -69 39 3 124 9 19 -69 36 17 129 0 45 -69 51 12 120 16 29 -69 17 47 123 26 37 -70 31 26 21 33 35 39 274 -22 123 48 56 -70 32 54 123 4 26 -70 29 54 128 6 59 -70 46 22 119 3 31 -70 9 57 122 20 29 -71 24 53 21 33 43 39 276 -22 122 43 40 -71 26 30 121 57 27 -71 23 14 127 12 13 -71 41 19 117 47 46 -71 1 47 121 11 57 -72 18 6 21 33 52 40 278 -22 121 36 5 -72 19 51 120 47 58 -72 16 19 126 16 14 -72 36 2 116 28 44 -71 53 18 120 0 32 -73 11 5 21 34 0 40 280 -23 120 25 43 -73 12 58 119 35 32 -73 9 10 125 18 44 -73 30 34 115 5 53 -72 44 31 118 45 43 -74 3 51 21 34 8 40 282 -23 119 12 2 -74 5 52 118 19 34 -74 1 47 124 19 21 -74 24 58 113 38 34 -73 35 26 117 26 48 -74 56 24 21 34 16 40 284 -24 117 54 24 -74 58 35 116 59 24 -74 54 11 123 17 39 -75 19 13 112 5 58 -74 26 2 116 2 58 -75 48 46 21 34 25 40 286 -24 116 31 59 -75 51 6 115 34 11 -75 46 23 122 13 8 -76 13 23 110 27 10 -75 16 18 114 33 12 -76 40 56 21 34 33 40 288 -24 115 3 48 -76 43 26 114 2 53 -76 38 22 121 5 6 -77 7 28 108 41 0 -76 6 14 112 56 12 -77 32 53 21 34 41 40 290 -24 113 28 33 -77 35 34 112 24 9 -77 30 8 119 52 41 -78 1 29 106 46 2 -76 55 46 111 10 17 -78 24 37 21 34 49 40 293 -25 111 44 36 -78 27 30 110 36 20 -78 21 40 118 34 45 -78 55 28 104 40 29 -77 44 53 109 13 16 -79 16 4 21 34 58 40 296 -25 109 49 47 -79 19 11 108 37 11 -79 12 54 117 9 45 -79 49 24 102 22 8 -78 33 28 107 2 14 -80 7 13 21 35 6 40 299 -25 107 41 13 -80 10 34 106 23 47 -80 3 47 115 35 35 -80 43 18 99 48 6 -79 21 26 104 33 15 -80 57 56 21 35 14 40 302 -25 105 14 58 -81 1 34 103 52 11 -80 54 14 113 49 11 -81 37 9 96 54 45 -80 8 37 101 40 50 -81 48 6 21 35 23 40 305 -25 102 25 35 -81 52 4 100 56 56 -81 44 5 111 46 6 -82 30 54 93 37 23 -80 54 49 98 17 18 -82 37 30 21 35 31 40 309 -25 99 5 15 -82 41 49 97 30 24 -82 33 6 109 19 28 -83 24 30 89 49 56 -81 39 43 94 11 33 -83 25 47 21 35 39 40 314 -25 95 2 43 -83 30 32 93 21 43 -83 20 57 106 18 12 -84 17 48 85 24 34 -82 22 56 89 7 22 -84 12 25 21 35 47 40 320 -25 90 1 15 -84 17 40 88 15 14 -84 7 5 102 23 24 -85 10 33 80 11 27 -83 3 52 82 41 11 -84 56 32 21 35 56 39 327 -26 83 36 5 -85 2 22 81 48 29 -84 50 38 97 0 27 -86 2 12 73 58 46 -83 41 42 74 19 52 -85 36 42 21 36 4 39 336 -26 75 11 35 -85 43 12 73 30 45 -85 30 10 89 1 17 -86 51 37 66 33 41 -84 15 18 63 23 5 -86 10 39 21 36 12 39 348 -25 64 2 47 -86 17 48 62 45 50 -86 3 29 76 5 44 -87 36 7 57 45 41 -84 43 10 49 21 35 -86 34 57 21 36 20 38 3 -25 49 34 48 -86 42 34 49 9 17 -86 27 22 54 7 3 -88 9 1 47 32 58 -85 3 33 32 44 0 -86 45 39 21 36 29 38 20 -25 32 17 15 -86 53 11 33 8 38 -86 38 8 22 26 47 -88 17 37 36 11 12 -85 14 36 15 31 57 -86 40 9 21 36 37 38 38 -25 14 27 11 -86 46 55 16 32 14 -86 33 19 - 5 57 12 -87 56 1 24 17 33 -85 14 59 0 12 59 -86 19 16 21 36 45 37 54 -25 - 1 12 21 -86 24 50 1 33 47 -86 13 34 - 23 35 49 -87 15 10 12 41 27 -85 4 26 - 12 3 51 -85 46 23 21 36 54 37 67 -25 - 13 32 59 -85 50 42 - 10 38 3 -85 41 54 - 34 4 54 -86 25 16 2 5 10 -84 43 43 - 21 29 47 -85 5 7 21 37 2 36 77 -25 - 22 54 6 -85 8 20 - 20 7 37 -85 1 43 - 40 49 27 -85 30 50 - 7 9 26 -84 14 24 - 28 44 14 -84 18 6 21 37 10 36 85 -25 - 30 0 56 -84 20 25 - 27 28 49 -84 15 38 - 45 33 2 -84 33 42 - 15 0 2 -83 38 10 - 34 24 16 -83 27 3 21 37 18 35 91 -24 - 35 33 14 -83 28 37 - 33 16 6 -83 25 20 - 49 6 30 -83 34 38 - 21 35 31 -82 56 27 - 38 57 31 -82 32 57 21 37 27 35 96 -24 - 39 59 29 -82 33 54 - 37 56 3 -82 31 52 - 51 56 29 -82 33 57 - 27 8 32 -82 10 26 - 42 43 6 -81 36 26 21 37 35 34 100 -24 - 43 39 1 -81 36 51 - 41 47 29 -81 35 52 - 54 18 3 -81 31 49 - 31 51 23 -81 20 55 - 45 54 7 -80 37 48 21 37 43 33 104 -23 - 46 44 52 -80 37 46 - 45 3 33 -80 37 43 - 56 20 15 -80 28 16 - 35 54 33 -80 28 29 - 48 39 39 -79 37 17 21 37 51 33 107 -23 - 49 26 2 -79 36 50 - 47 53 23 -79 37 37 - 58 8 52 -79 23 14 - 39 26 28 -79 33 31 - 51 6 5 -78 34 57 21 38 0 32 110 -22 - 51 48 44 -78 34 7 - 50 23 30 -78 35 40 - 59 47 46 -78 16 40 - 42 33 43 -78 36 16 - 53 18 3 -77 30 48 21 38 8 31 113 -22 - 53 57 32 -77 29 36 - 52 38 37 -77 31 53 - 61 19 40 -77 8 27 - 45 21 28 -77 36 52 - 55 18 59 -76 24 47 21 38 16 30 115 -21 - 55 55 43 -76 23 14 - 54 42 15 -76 26 13 - 62 46 33 -75 58 24 - 47 53 42 -76 35 24 - 57 11 27 -75 16 48 21 38 25 29 117 -21 - 57 45 50 -75 14 54 - 56 37 4 -75 18 35 - 64 9 56 -74 46 20 - 50 13 36 -75 31 50 - 58 57 31 -74 6 40 21 38 33 28 119 -20 - 59 29 51 -74 4 26 - 58 25 10 -74 8 49 - 65 31 1 -73 31 59 - 52 23 40 -74 26 7 - 60 38 48 -72 54 13 21 38 41 27 121 -20 - 61 9 23 -72 51 36 - 60 8 13 -72 56 43 - 66 50 51 -72 15 2 - 54 25 59 -73 18 9 - 62 16 43 -71 39 8 21 38 49 26 123 -19 - 62 45 46 -71 36 8 - 61 47 40 -71 42 2 - 68 10 22 -70 55 7 - 56 22 16 -72 7 43 - 63 52 28 -70 21 6 21 38 58 25 125 -18 - 64 20 12 -70 17 41 - 63 24 43 -70 24 24 - 69 30 26 -69 31 41 - 58 13 59 -70 54 37 - 65 27 10 -68 59 37 21 39 6 24 127 -17 - 65 53 48 -68 55 44 - 65 0 32 -69 3 23 - 70 52 2 -68 4 7 - 60 2 26 -69 38 30 - 67 1 58 -67 34 6 21 39 14 22 129 -16 - 67 27 40 -67 29 42 - 66 36 16 -67 38 24 - 72 16 14 -66 31 29 - 61 48 51 -68 18 58 - 68 38 5 -66 3 45 21 39 22 21 130 -15 - 69 3 3 -65 58 43 - 68 13 7 -66 8 39 - 73 44 23 -64 52 32 - 63 34 26 -66 55 26 - 70 16 55 -64 27 23 21 39 31 19 132 -14 - 70 41 24 -64 21 36 - 69 52 29 -64 33 2 - 75 18 22 -63 5 24 - 65 20 28 -65 27 10 - 72 0 22 -62 43 22 21 39 39 18 134 -12 - 72 24 36 -62 36 37 - 71 36 12 -62 49 57 - 77 1 1 -61 7 2 - 67 8 24 -63 53 5 - 73 51 6 -60 49 3 21 39 47 16 136 -11 - 74 15 28 -60 40 59 - 73 26 50 -60 56 54 - 78 57 22 -58 51 59 - 69 0 6 -62 11 41 - 75 53 35 -58 39 51 21 39 56 13 138 -9 - 76 18 43 -58 29 49 - 75 28 38 -58 49 34 - 81 18 24 -56 8 10 - 70 58 8 -60 20 35 - 78 16 51 -56 6 18 21 40 4 11 140 -6 - 78 44 11 -55 52 47 - 77 49 55 -56 19 14 - 84 43 15 -52 12 22 - 73 6 39 -58 15 43 - 81 27 16 -52 40 20 21 40 12 7 142 -3 - 82 2 25 -52 17 15 - 80 53 43 -53 1 31 ... .. .. .. .. .. - 75 33 35 -55 49 5 Uncertainty in time = +/- 13 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: TYC 7385-00763-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 46 23.5118 DE: -35 08 00.867 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .022 ) * V mag [mag]: 9.8 * B mag [mag]: 9.7 * Apparent position with proper motion RA(deg): 266.7483594819 DE(deg): -35.1380488790 * Equation of equinoxes (radians) : 0.000041399347379 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2787) Tovarishch approx. diameter [km]: 18 approx. diameter ["]: .011 distance from Earth [AU]: 2.22300 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 636 number of rejected observations: 10 time covered by the observations: 1957 Oct 20 - 2007 Aug 07 1 sigma uncertainty ellipse (major, minor, PA): 0.097, 0.052, 97° remarks: * orbital elements for (2787) Tovarishch : Mean anomaly = 174.03803487 deg Arg. of pericenter = 57.41554097 deg Long. of node = 30.59788371 deg Inclination = 10.31695632 deg Eccentricity = 0.05768726 Semimajor axis = 3.02337275 AU Perihelion dist = 2.84896266 AU Mag: H = 11.36, G = 0.15 Epoch of elements : MJD 54618.89900000 TDT (2008 Jun 01.899) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jun 1 2787 Tovarishch 21h 34.8m UT 9.8 17 46 23.512-35 8 0.87TYC 7385-00763-1 9.7 16.0 18 1.4 2.223 -2.236 -6.39 52.1556 -35.133 -144.21 22.20 21.5804 0.17252 -0.73832 -6.92951 -1.61609 -0.00152 0.00115 2000 172.3696062008 524.00000 57.415541 30.597884 10.3169560.05768726 3.0233728 2.848962711.3 5.00.15 RATE 1.8748500 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.100 0.057 97 6.61 0.063 0 54579.5020080601_0763-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 27, 20:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org