IOTA/IOTA-ES occultation update for (4) Vesta / TYC 0040-00371-1 event on 2008 Dec 03, 04:59 UT Visible from USA Summary ------- On 2008 Dec 03 UT, the 547 km diameter asteroid (4) Vesta will occult a 11.7 mag star in the constellation Pisces for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.0 mag to 7.1 mag (the magnitude of the asteroid) for at most 88.6 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2008 Dec 03, 04:45 - 2008 Dec 03, 05:14 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 0.0 * estimated maximum duration [s]: 88.6 * Moon: 24 % sunlit, 80° distance * Sun: 138° distance * rough path description: USA Additional comments ------------------- extremely small mag drop The occultation path -------------------- * approximate projected width [km]: 651 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 9.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .024", 89° ) * approx speed of asteroid's shadow [km/s]: 6.1742 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0040-00371-1 by 4 Vesta on 2008 Dec 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 161 0 0 49 13 32 5 14 27 9 96 0 52 12 43 46 20 8 52 34 40 45 59 40 162 0 0 49 13 22 5 14 25 10 97 -1 52 12 36 46 19 57 52 34 33 45 59 29 163 0 0 49 13 0 5 14 22 11 98 -1 52 12 15 46 19 32 52 34 13 45 59 4 164 0 0 49 12 24 5 14 20 11 98 -2 52 11 42 46 18 54 52 33 40 45 58 26 165 0 0 49 11 34 5 14 17 12 99 -2 52 10 56 46 18 2 52 32 54 45 57 33 166 0 0 49 10 32 5 14 14 13 100 -3 52 9 56 46 16 56 52 31 55 45 56 27 167 0 0 49 9 16 5 14 11 13 101 -3 52 8 44 46 15 37 52 30 43 45 55 8 168 0 0 49 7 47 5 14 8 14 102 -4 52 7 19 46 14 5 52 29 18 45 53 35 169 0 0 49 6 4 5 14 4 14 102 -4 52 5 41 46 12 18 52 27 41 45 51 48 170 0 0 49 4 9 5 14 1 15 103 -5 52 3 50 46 10 19 52 25 50 45 49 48 171 0 0 49 2 0 5 13 57 16 104 -5 52 1 46 46 8 5 52 23 47 45 47 34 172 0 0 48 59 38 5 13 53 16 105 -6 51 59 30 46 5 39 52 21 31 45 45 7 173 0 0 48 57 3 5 13 49 17 105 -7 51 57 0 46 2 59 52 19 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41 4 55 37 53 231 -78 32 35 34 26 26 29 32 58 38 26 5 8 - 86 0 0 29 11 18 4 55 22 52 232 -79 32 19 4 26 10 13 32 42 7 25 48 53 - 85 0 0 28 54 59 4 55 8 52 233 -80 32 2 37 25 54 1 32 25 39 25 32 41 - 84 0 0 28 38 43 4 54 53 51 235 -80 31 46 13 25 37 52 32 9 14 25 16 33 - 83 0 0 28 22 31 4 54 39 51 236 -81 31 29 53 25 21 47 31 52 52 25 0 29 - 82 0 0 28 6 23 4 54 24 50 237 -82 31 13 36 25 5 46 31 36 35 24 44 29 - 81 0 0 27 50 19 4 54 10 49 239 -83 30 57 24 24 49 50 31 20 21 24 28 34 - 80 0 0 27 34 20 4 53 56 49 240 -83 30 41 16 24 33 58 31 4 12 24 12 43 - 79 0 0 27 18 26 4 53 42 48 241 -84 30 25 13 24 18 12 30 48 8 23 56 58 - 78 0 0 27 2 37 4 53 28 48 242 -84 30 9 15 24 2 31 30 32 9 23 41 18 - 77 0 0 26 46 54 4 53 14 47 243 -85 29 53 22 23 46 56 30 16 15 23 25 43 - 76 0 0 26 31 16 4 53 0 46 244 -85 29 37 36 23 31 27 30 0 27 23 10 15 - 75 0 0 26 15 45 4 52 46 46 245 -85 29 21 55 23 16 4 29 44 46 22 54 53 - 74 0 0 26 0 21 4 52 33 45 246 -86 29 6 21 23 0 48 29 29 10 22 39 38 - 73 0 0 25 45 3 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49 28 34 258 -75 25 29 25 19 28 31 25 51 56 19 7 35 - 58 0 0 22 12 55 4 49 18 33 259 -74 25 16 18 19 15 41 25 38 47 18 54 47 - 57 0 0 22 0 8 4 49 7 32 259 -73 25 3 22 19 3 4 25 25 50 18 42 11 - 56 0 0 21 47 34 4 48 57 31 260 -73 24 50 39 18 50 38 25 13 5 18 29 46 - 55 0 0 21 35 12 4 48 47 30 260 -72 24 38 7 18 38 24 25 0 32 18 17 33 - 54 0 0 21 23 2 4 48 37 30 261 -71 24 25 48 18 26 23 24 48 12 18 5 33 - 53 0 0 21 11 6 4 48 27 29 262 -70 24 13 42 18 14 34 24 36 5 17 53 45 - 52 0 0 20 59 22 4 48 18 28 262 -69 24 1 49 18 2 58 24 24 11 17 42 10 - 51 0 0 20 47 51 4 48 9 27 263 -68 23 50 10 17 51 36 24 12 30 17 30 48 - 50 0 0 20 36 34 4 48 0 26 263 -67 23 38 44 17 40 27 24 1 3 17 19 40 - 49 0 0 20 25 31 4 47 51 25 264 -66 23 27 32 17 29 31 23 49 50 17 8 45 - 48 0 0 20 14 41 4 47 43 24 264 -65 23 16 34 17 18 49 23 38 51 16 58 4 - 47 0 0 20 4 6 4 47 35 24 264 -64 23 5 51 17 8 21 23 28 7 16 47 37 - 46 0 0 19 53 45 4 47 27 23 265 -63 22 55 22 16 58 8 23 17 37 16 37 25 - 45 0 0 19 43 40 4 47 20 22 265 -62 22 45 9 16 48 9 23 7 23 16 27 27 - 44 0 0 19 33 49 4 47 12 21 266 -62 22 35 10 16 38 25 22 57 23 16 17 44 - 43 0 0 19 24 13 4 47 6 20 266 -61 22 25 27 16 28 56 22 47 39 16 8 16 - 42 0 0 19 14 53 4 46 59 19 267 -60 22 16 0 16 19 43 22 38 11 15 59 3 - 41 0 0 19 5 48 4 46 52 18 267 -59 22 6 48 16 10 45 22 28 58 15 50 5 - 40 0 0 18 57 0 4 46 46 17 267 -58 21 57 53 16 2 2 22 20 2 15 41 23 - 39 0 0 18 48 27 4 46 41 16 268 -57 21 49 14 15 53 36 22 11 22 15 32 58 - 38 0 0 18 40 11 4 46 35 15 268 -56 21 40 51 15 45 25 22 2 59 15 24 48 - 37 0 0 18 32 12 4 46 30 14 268 -55 21 32 46 15 37 31 21 54 53 15 16 54 - 36 0 0 18 24 29 4 46 25 14 269 -54 21 24 57 15 29 53 21 47 4 15 9 17 - 35 0 0 18 17 3 4 46 20 13 269 -53 21 17 26 15 22 32 21 39 32 15 1 57 - 34 0 0 18 9 54 4 46 16 12 269 -52 21 10 12 15 15 28 21 32 17 14 54 53 - 33 0 0 18 3 3 4 46 12 11 270 -51 21 3 16 15 8 41 21 25 20 14 48 7 - 32 0 0 17 56 29 4 46 9 10 270 -50 20 56 37 15 2 12 21 18 41 14 41 38 - 31 0 0 17 50 13 4 46 5 9 270 -49 20 50 17 14 56 0 21 12 20 14 35 26 - 30 0 0 17 44 14 4 46 2 8 271 -48 20 44 15 14 50 5 21 6 18 14 29 32 - 29 0 0 17 38 34 4 46 0 7 271 -48 20 38 31 14 44 28 21 0 33 14 23 56 - 28 0 0 17 33 13 4 45 57 6 271 -47 20 33 6 14 39 10 20 55 8 14 18 37 - 27 0 0 17 28 9 4 45 56 5 272 -46 20 27 59 14 34 9 20 50 1 14 13 37 - 26 0 0 17 23 24 4 45 54 4 272 -45 20 23 12 14 29 27 20 45 13 14 8 55 - 25 0 0 17 18 58 4 45 53 3 272 -44 20 18 44 14 25 3 20 40 45 14 4 32 - 24 0 0 17 14 51 4 45 52 2 272 -43 20 14 35 14 20 58 20 36 35 14 0 27 - 23 0 0 17 11 3 4 45 51 1 273 -42 20 10 45 14 17 12 20 32 46 13 56 40 - 22 0 0 17 7 35 4 45 51 0 273 -41 20 7 15 14 13 44 20 29 16 13 53 13 Uncertainty in time = +/- 10 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: TYC 0040-00371-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 04 31.2254 DE: +02 59 44.870 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .049, .022 ) * V mag [mag]: 11.7 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4) Vesta approx. diameter [km]: 547 approx. diameter ["]: .438 distance from Earth [AU]: 1.72100 * orbital information: orbit source: Preston date of fit: 2008 Oct 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 5696 number of rejected observations: 780 time covered by the observations: 1903 Oct 31 - 2008 Oct 01 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.009, 69° remarks: * orbital elements for (4) Vesta : Mean anomaly = 145.73496874 deg Arg. of pericenter = 149.85579984 deg Long. of node = 103.91483008 deg Inclination = 7.13518286 deg Eccentricity = 0.08905169 Semimajor axis = 2.36127544 AU Perihelion dist = 2.15099986 AU Mag: H = 3.16, G = 0.32 Epoch of elements : MJD 54803.20800000 TDT (2008 Dec 03.208) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 3 4 Vesta 5h 0.3m UT 11.7 2 4 31.225 2 59 44.87TYC 0040-00371-1 12.3 7.1 547 88.6 1.721 -1.142 4.87 -116.3438 2.995 102.39 -22.15 5.0049 0.14830 0.52158 -3.35264 0.95085 0.00340 0.00199 2000 144.86356720081130.00000149.855800103.914830 7.1351830.08905169 2.3612754 2.1509999 3.2 5.00.32 RATE 2.7163400 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.051 0.024 89 1.06 0.027 0 54796.5020081203_0371-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org