Update for (497) Iva - October 17/18, 2003

Update computed by Jan Manek; issued 14 Oct 2003 22:35 +0200 (CEST)

Jan Manek's update

                IOTA/IOTA-ES occultation update for
         (497) Iva / TYC 0628-00469-1 on October 17/18, 2003
          visible from Russia, Belarus, Lithuania, S Sweden,
                         Canada and NW USA


Summary

In the night of October 17/18, 2003 a faint 12.0 mag star TYC 0628-00469-1 will be occulted by a 45 km asteroid (497) Iva. This update is based on USNO/Flagstaff and Ondrejov astrometry for the asteroid and UCAC2 star position.

The updated path shows ~14 path width north shift with time ~1.7 minutes earlier compared to Edwin Goffin's nominal prediction.

Updated path runs due to north shift over Russia ~2:48.0 UT, N Belarus ~2:48.8 UT, Lithuania ~2:49.3 UT, S Sweden ~2:50.3 UT and later Canada from NE to SW ~3:00 to `3:07 UT and NW USA ~3:08.5 UT. Please check the path chart for details.

Observation residual in recent opposition indicate possible additional north shift.Clear sky and good luck !!!

The event at one glimpse: * date and approx. UT time of event: October 18, 2003 @ 02:50 UT (Europe) 03:05 UT (N.America) * magnitude of target star: 12.0 * magnitude drop [mag]: 0.7 * estimated maximum duration [s]: 7.0 * path description: given above * Goffin's original chart reference: A03_1036 The occultation path: * approximate ground width [km]: 65 * uncertainty [path widths]: 1.7 * uncertainty in time [s]: 12 * map: below * remarks: Path uncertainties are given according to nominal star position errors and expected asteroid positional accuracy. Data for the target star: * name: TYC 0628-00469-1 * constellation: Aries * J2000 position [h,m,s; o,',"]: 01h 49m 37.4152s; +14o 53' 50.852" * position source: UCAC2 * estimated accuracy ["]: 0.03" (0.02", 0.02") * V mag [mag]: 11.96 * B-V [mag]: +0.69 * remarks: Target star is in west Aries, about 4.4 degrees east of 3.6 mag star eta Piscii = SAO 92484. Companion star of same magnitude 1.3' SW of target. !!! IMPORTANT !!! Purple stars in identification chart are so called 'non-star' objects in GSC; in dense fields the 'non-stars' are often real stars or blends of close pairs. Be careful about this. Close finding chart (prepared in GUIDE8): * occulted star is in center - labeled with cross * field is 3.0x3.0 degrees * limiting magnitude is 13.0 * labeled stars have indicated SAO numbers * remarks: Second chart shows 30' blowup to show correctly the star in field.

Data for the minor planet: * general information: number, name: (497) Iva approx. diameter [km]: 45 * orbital information orbit source: calculation Manek source of used astrometry: USNO/Flagstaff (Ron Stone), Ondrejov (Sarounova, Manek) number of used observations: 104 USNO, 6 Ondrejov number of rejected observations: 14 USNO time covered by the observations: 1998 07 28 - 2003 10 13 rms residuals ["] (RA,DE): 0.10", 0.10" estimated positional accuracy at epoch of event ["]: 0.10", 0.10" remarks: Data for the event: * UT date and time of least geocentric approach: 02:58.5 UT * approx. V mag of minor planet at event [mag]: 11.9 * geocentric parallax of minor planet ["]: 8.571 * magnitude drop [mag]: 0.7 * estimated maximum duration [s]: 7.0 * apparent motion of minor planet ["/h]: 31.32 * angular distance to moon, phase of moon [deg,%]: 79, 54% * remarks: Elements for WinOccult: ============ cut here =========================================== 2003 Oct 18 497 Iva 2h 58.5m UT 12.0 1 49 37.415 14 53 50.85TYC 0628-00469-1 12.6 11.9 45 7.0 1.026 -2.157 -1.91 -43.404 14.900 131.72 -9.43 2.9742 -.04241 .69498 -3.64656 -0.22200 -0.00048 -0.00052 2000 7.31786867200310 8.000002.657018 6.808933 4.837599 0.300431672.851583961.9948778210.05 0.11 RATE 2.0467973 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 ============ cut here =========================================== Calculator(s): Jan Manek

Updated path location for (497) Iva on October 17/18, 2003

Updated path location for (497) Iva on October 17/18, 2003

Path coordinates: Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 ...................................... shortened ............................................. o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 47 0 0 50 36 10 2 47 18 13 278 -6 50 54 10 50 18 16 51 55 25 49 18 48 46 0 0 50 50 24 2 47 22 14 277 -6 51 8 24 50 32 31 52 9 36 49 33 5 45 0 0 51 4 29 2 47 26 14 276 -7 51 22 27 50 46 36 52 23 37 49 47 12 44 0 0 51 18 23 2 47 30 15 275 -8 51 36 21 51 0 31 52 37 28 50 1 9 43 0 0 51 32 7 2 47 34 16 275 -8 51 50 4 51 14 16 52 51 8 50 14 57 42 0 0 51 45 41 2 47 38 16 274 -9 52 3 37 51 27 50 53 4 38 50 28 34 41 0 0 51 59 4 2 47 42 17 273 -9 52 17 0 51 41 14 53 17 58 50 42 1 40 0 0 52 12 17 2 47 47 17 272 -10 52 30 12 51 54 28 53 31 7 50 55 17 39 0 0 52 25 19 2 47 52 18 271 -11 52 43 13 52 7 31 53 44 5 51 8 23 38 0 0 52 38 10 2 47 56 19 270 -11 52 56 3 52 20 23 53 56 52 51 21 18 37 0 0 52 50 51 2 48 1 19 270 -12 53 8 43 52 33 5 54 9 29 51 34 3 36 0 0 53 3 20 2 48 6 20 269 -12 53 21 11 52 45 35 54 21 54 51 46 36 35 0 0 53 15 39 2 48 12 20 268 -13 53 33 29 52 57 54 54 34 8 51 58 59 34 0 0 53 27 46 2 48 17 21 267 -14 53 45 35 53 10 3 54 46 11 52 11 10 33 0 0 53 39 42 2 48 22 21 266 -14 53 57 30 53 22 0 54 58 2 52 23 10 32 0 0 53 51 27 2 48 28 22 265 -15 54 9 14 53 33 46 55 9 42 52 34 59 31 0 0 54 3 0 2 48 33 23 264 -15 54 20 46 53 45 20 55 21 11 52 46 37 30 0 0 54 14 22 2 48 39 23 263 -16 54 32 7 53 56 43 55 32 29 52 58 4 29 0 0 54 25 33 2 48 45 24 263 -16 54 43 17 54 7 55 55 43 34 53 9 19 28 0 0 54 36 32 2 48 50 24 262 -17 54 54 15 54 18 55 55 54 29 53 20 22 27 0 0 54 47 20 2 48 56 25 261 -18 55 5 1 54 29 44 56 5 11 53 31 14 26 0 0 54 57 56 2 49 2 25 260 -18 55 15 36 54 40 21 56 15 42 53 41 55 25 0 0 55 8 20 2 49 8 26 259 -19 55 26 0 54 50 46 56 26 2 53 52 24 24 0 0 55 18 33 2 49 15 26 258 -19 55 36 11 55 1 0 56 36 10 54 2 41 23 0 0 55 28 34 2 49 21 27 257 -20 55 46 11 55 11 2 56 46 6 54 12 47 22 0 0 55 38 23 2 49 27 27 256 -20 55 55 59 55 20 52 56 55 50 54 22 41 21 0 0 55 48 1 2 49 34 28 255 -21 56 5 36 55 30 31 57 5 23 54 32 23 20 0 0 55 57 27 2 49 40 28 254 -21 56 15 1 55 39 58 57 14 44 54 41 53 19 0 0 56 6 41 2 49 47 29 253 -22 56 24 14 55 49 13 57 23 53 54 51 12 18 0 0 56 15 43 2 49 53 29 252 -22 56 33 15 55 58 17 57 32 50 55 0 19 17 0 0 56 24 34 2 50 0 30 251 -23 56 42 5 56 7 9 57 41 36 55 9 15 16 0 0 56 33 13 2 50 6 30 250 -23 56 50 43 56 15 49 57 50 10 55 17 58 15 0 0 56 41 40 2 50 13 31 249 -23 56 59 9 56 24 17 57 58 33 55 26 30 14 0 0 56 49 56 2 50 20 31 248 -24 57 7 23 56 32 34 58 6 43 55 34 50 13 0 0 56 58 0 2 50 27 32 247 -24 57 15 26 56 40 39 58 14 42 55 42 59 12 0 0 57 5 52 2 50 34 32 246 -25 57 23 17 56 48 32 58 22 30 55 50 55 11 0 0 57 13 33 2 50 41 32 245 -25 57 30 57 56 56 14 58 30 6 55 58 40 10 0 0 57 21 1 2 50 48 33 244 -26 57 38 24 57 3 43 58 37 30 56 6 13 9 0 0 57 28 18 2 50 55 33 243 -26 57 45 41 57 11 2 58 44 42 56 13 35 8 0 0 57 35 24 2 51 2 34 242 -26 57 52 45 57 18 8 58 51 43 56 20 44 7 0 0 57 42 18 2 51 9 34 241 -27 57 59 38 57 25 3 58 58 32 56 27 43 6 0 0 57 49 0 2 51 16 34 240 -27 58 6 19 57 31 46 59 5 10 56 34 29 5 0 0 57 55 31 2 51 24 35 239 -28 58 12 49 57 38 18 59 11 37 56 41 4 4 0 0 58 1 50 2 51 31 35 238 -28 58 19 7 57 44 38 59 17 51 56 47 27 3 0 0 58 7 57 2 51 38 36 237 -28 58 25 14 57 50 46 59 23 55 56 53 38 2 0 0 58 13 53 2 51 45 36 236 -29 58 31 9 57 56 43 59 29 47 56 59 38 1 0 0 58 19 38 2 51 53 36 235 -29 58 36 53 58 2 29 59 35 27 57 5 26 0 0 0 58 25 11 2 52 0 37 233 -30 58 42 25 58 8 3 59 40 57 57 11 3 - 1 0 0 58 30 33 2 52 8 37 232 -30 58 47 46 58 13 25 59 46 14 57 16 28 - 2 0 0 58 35 43 2 52 15 37 231 -30 58 52 55 58 18 36 59 51 21 57 21 42 - 3 0 0 58 40 42 2 52 23 38 230 -31 58 57 53 58 23 36 59 56 16 57 26 44 - 4 0 0 58 45 29 2 52 30 38 229 -31 59 2 40 58 28 24 60 1 0 57 31 34 - 5 0 0 58 50 5 2 52 38 38 228 -31 59 7 15 58 33 1 60 5 33 57 36 14 - 6 0 0 58 54 30 2 52 45 39 227 -32 59 11 39 58 37 26 60 9 54 57 40 41 - 7 0 0 58 58 44 2 52 53 39 226 -32 59 15 52 58 41 40 60 14 5 57 44 58 - 8 0 0 59 2 46 2 53 1 39 224 -32 59 19 53 58 45 43 60 18 4 57 49 3 - 9 0 0 59 6 37 2 53 8 40 223 -33 59 23 44 58 49 35 60 21 52 57 52 56 ...................................... shortened ............................................. - 59 0 0 58 24 29 3 0 2 45 159 -40 58 41 44 58 7 19 59 40 23 57 10 13 - 60 0 0 58 18 56 3 0 10 45 157 -40 58 36 13 58 1 45 59 34 54 57 4 36 - 61 0 0 58 13 13 3 0 19 45 156 -40 58 30 30 57 56 0 59 29 14 56 58 49 - 62 0 0 58 7 17 3 0 28 45 155 -40 58 24 36 57 50 4 59 23 24 56 52 50 - 63 0 0 58 1 11 3 0 37 45 154 -40 58 18 30 57 43 57 59 17 22 56 46 39 - 64 0 0 57 54 53 3 0 46 44 152 -40 58 12 14 57 37 38 59 11 8 56 40 17 - 65 0 0 57 48 24 3 0 54 44 151 -40 58 5 45 57 31 8 59 4 44 56 33 44 - 66 0 0 57 41 44 3 1 3 44 150 -40 57 59 6 57 24 27 58 58 8 56 27 0 - 67 0 0 57 34 52 3 1 12 44 148 -40 57 52 15 57 17 34 58 51 21 56 20 4 - 68 0 0 57 27 49 3 1 21 44 147 -40 57 45 13 57 10 30 58 44 22 56 12 56 - 69 0 0 57 20 35 3 1 30 44 146 -40 57 38 0 57 3 15 58 37 12 56 5 37 - 70 0 0 57 13 9 3 1 39 43 144 -40 57 30 35 56 55 48 58 29 51 55 58 7 - 71 0 0 57 5 32 3 1 48 43 143 -39 57 22 59 56 48 9 58 22 19 55 50 26 - 72 0 0 56 57 43 3 1 57 43 142 -39 57 15 11 56 40 20 58 14 35 55 42 33 - 73 0 0 56 49 43 3 2 6 43 141 -39 57 7 13 56 32 19 58 6 40 55 34 28 - 74 0 0 56 41 32 3 2 14 43 139 -39 56 59 2 56 24 6 57 58 33 55 26 12 - 75 0 0 56 33 9 3 2 23 42 138 -39 56 50 41 56 15 43 57 50 15 55 17 45 - 76 0 0 56 24 35 3 2 32 42 137 -39 56 42 8 56 7 7 57 41 46 55 9 6 - 77 0 0 56 15 49 3 2 41 42 136 -38 56 33 23 55 58 21 57 33 6 55 0 16 - 78 0 0 56 6 52 3 2 50 42 134 -38 56 24 27 55 49 23 57 24 14 54 51 15 - 79 0 0 55 57 44 3 2 59 41 133 -38 56 15 20 55 40 14 57 15 10 54 42 2 - 80 0 0 55 48 25 3 3 8 41 132 -38 56 6 2 55 30 53 57 5 56 54 32 38 - 81 0 0 55 38 54 3 3 17 41 131 -38 55 56 32 55 21 21 56 56 30 54 23 3 - 82 0 0 55 29 11 3 3 26 40 129 -37 55 46 51 55 11 38 56 46 52 54 13 16 - 83 0 0 55 19 18 3 3 35 40 128 -37 55 36 58 55 1 43 56 37 4 54 3 18 - 84 0 0 55 9 13 3 3 44 40 127 -37 55 26 55 54 51 37 56 27 4 53 53 9 - 85 0 0 54 58 57 3 3 52 39 126 -37 55 16 40 54 41 20 56 16 52 53 42 49 - 86 0 0 54 48 30 3 4 1 39 125 -36 55 6 14 54 30 52 56 6 30 53 32 17 - 87 0 0 54 37 52 3 4 10 39 124 -36 54 55 37 54 20 13 55 55 57 53 21 35 - 88 0 0 54 27 3 3 4 19 38 122 -36 54 44 48 54 9 23 55 45 12 53 10 41 - 89 0 0 54 16 2 3 4 28 38 121 -35 54 33 49 53 58 22 55 34 16 52 59 37 - 90 0 0 54 4 51 3 4 36 37 120 -35 54 22 39 53 47 9 55 23 9 52 48 21 - 91 0 0 53 53 29 3 4 45 37 119 -35 54 11 17 53 35 46 55 11 51 52 36 55 - 92 0 0 53 41 56 3 4 54 37 118 -34 53 59 45 53 24 12 55 0 22 52 25 18 - 93 0 0 53 30 12 3 5 3 36 117 -34 53 48 2 53 12 27 54 48 43 52 13 30 - 94 0 0 53 18 17 3 5 11 36 116 -34 53 36 9 53 0 32 54 36 52 52 1 31 - 95 0 0 53 6 12 3 5 20 35 115 -33 53 24 4 52 48 25 54 24 51 51 49 22 - 96 0 0 52 53 56 3 5 28 35 114 -33 53 11 49 52 36 9 54 12 39 51 37 3 - 97 0 0 52 41 30 3 5 37 34 113 -33 52 59 24 52 23 42 54 0 17 51 24 33 - 98 0 0 52 28 53 3 5 45 34 112 -32 52 46 48 52 11 4 53 47 44 51 11 53 - 99 0 0 52 16 6 3 5 54 34 111 -32 52 34 2 51 58 17 53 35 1 50 59 3 -100 0 0 52 3 9 3 6 2 33 109 -31 52 21 6 51 45 19 53 22 7 50 46 3 -101 0 0 51 50 2 3 6 10 33 108 -31 52 8 0 51 32 11 53 9 3 50 32 52 -102 0 0 51 36 45 3 6 19 32 107 -31 51 54 43 51 18 53 52 55 50 50 19 32 -103 0 0 51 23 19 3 6 27 32 106 -30 51 41 17 51 5 26 52 42 26 50 6 3 -104 0 0 51 9 42 3 6 35 31 105 -30 51 27 42 50 51 49 52 28 53 49 52 24 -105 0 0 50 55 57 3 6 43 31 105 -29 51 13 56 50 38 3 52 15 10 49 38 35 -106 0 0 50 42 1 3 6 51 30 104 -29 51 0 2 50 24 7 52 1 17 49 24 38 -107 0 0 50 27 57 3 6 59 29 103 -28 50 45 58 50 10 2 51 47 15 49 10 31 -108 0 0 50 13 44 3 7 6 29 102 -28 50 31 45 49 55 48 51 33 4 48 56 15 -109 0 0 49 59 21 3 7 14 28 101 -27 50 17 23 49 41 25 51 18 44 48 41 51 -110 0 0 49 44 51 3 7 22 28 100 -27 50 2 53 49 26 54 51 4 15 48 27 18 -111 0 0 49 30 11 3 7 29 27 99 -26 49 48 14 49 12 14 50 49 38 48 12 37 -112 0 0 49 15 24 3 7 37 27 98 -26 49 33 27 48 57 26 50 34 52 47 57 48 -113 0 0 49 0 28 3 7 44 26 97 -25 49 18 32 48 42 30 50 19 58 47 42 51 -114 0 0 48 45 24 3 7 51 25 96 -25 49 3 28 48 27 26 50 4 56 47 27 46 -115 0 0 48 30 13 3 7 58 25 95 -24 48 48 17 48 12 15 49 49 46 47 12 33 -116 0 0 48 14 54 3 8 5 24 94 -23 48 32 59 47 56 56 49 34 28 46 57 14 -117 0 0 47 59 29 3 8 12 24 94 -23 48 17 33 47 41 30 49 19 3 46 41 47 -118 0 0 47 43 56 3 8 19 23 93 -22 48 2 1 47 25 57 49 3 31 46 26 14 -119 0 0 47 28 16 3 8 25 22 92 -22 47 46 21 47 10 17 48 47 52 46 10 34 -120 0 0 47 12 31 3 8 31 22 91 -21 47 30 36 46 54 31 48 32 7 45 54 48 -121 0 0 46 56 39 3 8 38 21 90 -20 47 14 44 46 38 39 48 16 15 45 38 55 -122 0 0 46 40 41 3 8 44 20 89 -20 46 58 46 46 22 41 48 0 17 45 22 57 -123 0 0 46 24 37 3 8 50 20 89 -19 46 42 42 46 6 38 47 44 13 45 6 54 -124 0 0 46 8 28 3 8 56 19 88 -18 46 26 33 45 50 29 47 28 4 44 50 46 -125 0 0 45 52 14 3 9 1 18 87 -18 46 10 19 45 34 15 47 11 49 44 34 32 -126 0 0 45 35 56 3 9 7 18 86 -17 45 54 0 45 17 57 46 55 30 44 18 14 -127 0 0 45 19 33 3 9 12 17 86 -16 45 37 37 45 1 34 46 39 6 44 1 52 -128 0 0 45 3 6 3 9 17 16 85 -16 45 21 10 44 45 7 46 22 38 43 45 26 ...................................... shortened ............................................. ---------------------------------------------------------------------------- Jan Manek Stefanik Observatory Private : Petrin 205 Werichova 950 118 46 Praha 1 152 00 Praha 5 - 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