IOTA/IOTA-ES occultation update for (29) Amphitrite / 2UCAC 41503534 event on 2008 May 02, 13:32 UT Visible from China Summary ------- On 2008 May 02 UT, the 212 km diameter asteroid (29) Amphitrite will occult a 12.1 mag star in the constellation Taurus for observers along a path across China. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.3 mag to 11.0 mag (the magnitude of the asteroid) for at most 5.2 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: 99 * date and approx. time of event: 2008 May 02, 13:34 - 2008 May 02, 13:35 UT * midpoint of event [JD]: 2454589.064325 * magnitude of target star: 12.1 * magnitude drop [mag]: 0.3 * estimated maximum duration [s]: 5.2 * Moon: 12 % sunlit, 83° distance * Sun: 43° distance * rough path description: China The occultation path -------------------- * approximate projected width [km]: 224 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .018 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .018", 360° ) * approx speed of asteroid's shadow [km/s]: 40.7421 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 41503534 by 29 Amphitrite on 2008 May 2 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 78 0 0 36 9 4 13 34 25 41 278 -1 35 2 24 37 16 13 34 26 34 37 52 42 79 0 0 35 46 5 13 34 27 40 279 -1 34 39 14 36 53 24 34 3 20 37 29 57 80 0 0 35 22 40 13 34 29 39 280 -2 34 15 41 36 30 9 33 39 41 37 6 48 81 0 0 34 58 52 13 34 30 38 280 -3 33 51 43 36 6 31 33 15 39 36 43 15 82 0 0 34 34 40 13 34 32 37 281 -4 33 27 21 35 42 28 32 51 12 36 19 17 83 0 0 34 10 4 13 34 34 36 282 -5 33 2 36 35 18 1 32 26 22 35 54 56 84 0 0 33 45 4 13 34 35 35 283 -6 32 37 28 34 53 10 32 1 9 35 30 10 85 0 0 33 19 41 13 34 37 34 283 -7 32 11 56 34 27 56 31 35 33 35 5 1 86 0 0 32 53 55 13 34 38 33 284 -8 31 46 2 34 2 19 31 9 34 34 39 29 87 0 0 32 27 47 13 34 40 33 285 -9 31 19 45 33 36 20 30 43 13 34 13 34 88 0 0 32 1 17 13 34 41 32 285 -10 30 53 7 33 9 57 30 16 30 33 47 16 89 0 0 31 34 24 13 34 43 31 286 -11 30 26 6 32 43 13 29 49 26 33 20 36 90 0 0 31 7 11 13 34 44 30 287 -12 29 58 45 32 16 7 29 22 0 32 53 34 91 0 0 30 39 36 13 34 45 29 287 -13 29 31 3 31 48 40 28 54 15 32 26 11 92 0 0 30 11 41 13 34 47 28 288 -14 29 3 1 31 20 52 28 26 9 31 58 27 93 0 0 29 43 26 13 34 48 27 289 -15 28 34 40 30 52 44 27 57 44 31 30 23 94 0 0 29 14 52 13 34 49 26 289 -16 28 5 59 30 24 16 27 29 0 31 1 58 95 0 0 28 45 58 13 34 51 25 290 -17 27 37 0 29 55 29 26 59 58 30 33 15 96 0 0 28 16 47 13 34 52 24 290 -18 27 7 43 29 26 23 26 30 38 30 4 13 97 0 0 27 47 18 13 34 53 23 291 -19 26 38 9 28 57 0 26 1 1 29 34 52 98 0 0 27 17 32 13 34 54 22 291 -20 26 8 18 28 27 19 25 31 7 29 5 14 99 0 0 26 47 30 13 34 55 21 292 -21 25 38 12 27 57 22 25 0 58 28 35 19 100 0 0 26 17 13 13 34 56 20 292 -22 25 7 50 27 27 9 24 30 35 28 5 9 101 0 0 25 46 41 13 34 57 19 293 -23 24 37 14 26 56 40 23 59 57 27 34 42 102 0 0 25 15 54 13 34 58 18 293 -24 24 6 24 26 25 57 23 29 5 27 4 1 103 0 0 24 44 55 13 34 59 17 294 -25 23 35 22 25 55 1 22 58 1 26 33 7 104 0 0 24 13 43 13 35 0 16 294 -26 23 4 7 25 23 51 22 26 45 26 1 59 105 0 0 23 42 19 13 35 1 15 295 -27 22 32 42 24 52 30 21 55 18 25 30 39 106 0 0 23 10 45 13 35 2 14 295 -28 22 1 6 24 20 58 21 23 41 24 59 7 107 0 0 22 39 1 13 35 2 13 295 -29 21 29 20 23 49 15 20 51 55 24 27 25 108 0 0 22 7 8 13 35 3 11 296 -30 20 57 26 23 17 23 20 20 1 23 55 33 109 0 0 21 35 7 13 35 3 10 296 -31 20 25 25 22 45 22 19 47 59 23 23 33 110 0 0 21 2 58 13 35 4 9 297 -32 19 53 16 22 13 14 19 15 51 22 51 25 111 0 0 20 30 44 13 35 4 8 297 -33 19 21 2 21 40 59 18 43 37 22 19 9 112 0 0 19 58 24 13 35 5 7 297 -34 18 48 43 21 8 38 18 11 19 21 46 48 113 0 0 19 26 0 13 35 5 6 298 -36 18 16 21 20 36 13 17 38 57 21 14 22 114 0 0 18 53 33 13 35 6 5 298 -37 17 43 55 20 3 44 17 6 32 20 41 52 115 0 0 18 21 3 13 35 6 4 298 -38 17 11 28 19 31 12 16 34 6 20 9 19 116 0 0 17 48 32 13 35 6 3 299 -39 16 38 59 18 58 38 16 1 38 19 36 44 117 0 0 17 16 1 13 35 6 2 299 -40 16 6 31 18 26 4 15 29 12 19 4 8 118 0 0 16 43 30 13 35 6 1 299 -41 15 34 3 17 53 30 .. .. .. 18 31 32 Uncertainty in time = +/- 1 secs [Prediction of 2008 Feb 17.0] Data for the target star ------------------------ * name: 2UCAC 41503534 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 36 16.2411 DE: +27 58 50.572 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .025 ) * V mag [mag]: 12.1 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 84.1969035614 DE(deg): 27.9877968355 * Equation of equinoxes (radians) : 0.000038496399654 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (29) Amphitrite approx. diameter [km]: 212 approx. diameter ["]: .096 distance from Earth [AU]: 3.05300 * orbital information: orbit source: Preston date of fit: 2008 Feb 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1409 number of rejected observations: 187 time covered by the observations: 1900 Jul 28 - 2008 Feb 02 1 sigma uncertainty ellipse (major, minor, PA): 0.007, 0.005, 89° remarks: * orbital elements for (29) Amphitrite : Mean anomaly = 36.05526872 deg Arg. of pericenter = 63.28623149 deg Long. of node = 356.49037655 deg Inclination = 6.09558978 deg Eccentricity = 0.07286875 Semimajor axis = 2.55486640 AU Perihelion dist = 2.36869647 AU Mag: H = 5.84, G = 0.20 Epoch of elements : MJD 54588.56400000 TDT (2008 May 02.564) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 2 29 Amphitrite 13h 32.6m UT 12.1 5 36 16.241 27 58 50.572UCAC 41503534 0.0 11.0 212 5.2 3.053 5.000 -0.03 20.0743 27.981 -23.92 15.60 13.5438 -0.00079 0.31865 22.99596 -0.00866 0.00372 0.00048 2000 33.9883262008 424.00000 63.286231356.490377 6.0955900.07286875 2.5548664 2.3686965 5.9 5.00.20 RATE 2.4135250 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.018 360 1.27 0.026 0 54513.5020080502_503534 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 03:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org