IOTA/IOTA-ES occultation update for (1000) Piazzia / UCAC2 12110024 event on 2008 Apr 03, 13:43 UT Visible from New Zealand, E Australia Summary ------- On 2008 Apr 03 UT, the 48 km diameter asteroid (1000) Piazzia will occult a 11.3 mag star in the constellation Telescopium for observers along a path across New Zealand, E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 14.2 mag (the magnitude of the asteroid) for at most 2.9 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: 45 * date and approx. time of event: 2008 Apr 03, 13:37 - 2008 Apr 03, 13:45 UT * midpoint of event [JD]: 2454560.07176667 * magnitude of target star: 11.3 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 2.9 * Moon: 9 % sunlit, 65° distance * Sun: 97° distance * rough path description: New Zealand, E Australia The occultation path -------------------- * approximate projected width [km]: 57 * 1 sigma uncertainty interval [path widths]: +/- 1.45 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .064", .039", 67° ) * approx speed of asteroid's shadow [km/s]: 16.6276 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 12110024 by 1000 Piazzia on 2008 Apr 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 140 54 58 -12 0 0 13 37 58 1 138 -74 140 33 32 141 16 19 ... .. .. ... .. .. 141 49 6 -13 0 0 13 37 58 2 137 -74 141 27 49 142 10 18 140 25 35 ... .. .. Latitude Latitude Latitude Latitude 142 0 0 -13 12 13 13 37 58 2 137 -74 -13 36 10 -12 48 27 -14 46 35 .. .. .. 143 0 0 -14 20 26 13 37 59 4 137 -74 -14 44 45 -13 56 18 -15 56 19 .. .. .. 144 0 0 -15 30 9 13 38 0 5 137 -74 -15 54 52 -15 5 38 -17 7 36 .. .. .. 145 0 0 -16 41 21 13 38 1 7 136 -74 -17 6 27 -16 16 26 -18 20 25 -15 5 13 146 0 0 -17 54 0 13 38 3 8 136 -74 -18 19 31 -17 28 41 -19 34 44 -16 16 21 147 0 0 -19 8 4 13 38 5 10 136 -74 -19 34 1 -18 42 20 -20 50 31 -17 28 51 148 0 0 -20 23 32 13 38 7 12 135 -73 -20 49 55 -19 57 23 -22 7 44 -18 42 43 149 0 0 -21 40 20 13 38 10 13 135 -72 -22 7 9 -21 13 44 -23 26 20 -19 57 53 150 0 0 -22 58 25 13 38 13 15 135 -72 -23 25 41 -22 31 23 -24 46 15 -21 14 18 151 0 0 -24 17 43 13 38 17 16 134 -71 -24 45 27 -23 50 14 -26 7 26 -22 31 54 152 0 0 -25 38 10 13 38 20 18 134 -70 -26 6 23 -25 10 14 -27 29 48 -23 50 38 153 0 0 -26 59 41 13 38 25 19 133 -68 -27 28 23 -26 31 17 -28 53 16 -25 10 25 154 0 0 -28 22 11 13 38 29 21 132 -67 -28 51 21 -27 53 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48 -44 32 14 168 0 0 -48 4 34 13 40 4 42 117 -46 -48 39 34 -47 30 3 -50 24 6 -45 52 32 169 0 0 -49 24 24 13 40 12 43 116 -45 -49 59 37 -48 49 41 -51 44 50 -47 11 35 170 0 0 -50 42 42 13 40 20 44 114 -43 -51 18 6 -50 7 49 -53 3 52 -48 29 16 171 0 0 -51 59 20 13 40 28 45 113 -42 -52 34 51 -51 24 19 -54 21 1 -49 45 26 172 0 0 -53 14 8 13 40 36 46 111 -41 -53 49 44 -52 39 2 -55 36 8 -50 59 57 173 0 0 -54 26 59 13 40 44 47 109 -39 -55 2 37 -53 51 52 -56 49 7 -52 12 41 174 0 0 -55 37 47 13 40 52 48 107 -38 -56 13 24 -55 2 41 -57 59 50 -53 23 33 175 0 0 -56 46 27 13 40 59 49 105 -37 -57 22 0 -56 11 25 -59 8 13 -54 32 27 176 0 0 -57 52 55 13 41 7 50 103 -35 -58 28 21 -57 17 59 -60 14 11 -55 39 18 177 0 0 -58 57 7 13 41 14 50 101 -34 -59 32 23 -58 22 20 -61 17 43 -56 44 4 178 0 0 -59 59 1 13 41 21 51 99 -33 -60 34 5 -59 24 26 -62 18 45 -57 46 41 179 0 0 -60 58 36 13 41 28 52 97 -32 -61 33 25 -60 24 15 -63 17 19 -58 47 8 180 0 0 -61 55 52 13 41 35 52 95 -31 -62 30 24 -61 21 47 -64 13 24 -59 45 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4 13 42 48 56 67 -20 -72 6 32 -71 9 51 -73 30 41 -69 49 27 -165 0 0 -72 6 37 13 42 52 56 65 -19 -72 34 38 -71 38 52 -73 57 20 -70 19 42 -164 0 0 -72 33 49 13 42 56 57 64 -19 -73 1 22 -72 6 30 -74 22 41 -70 48 34 -163 0 0 -72 59 44 13 42 59 57 62 -18 -73 26 50 -72 32 51 -74 46 46 -71 16 9 -162 0 0 -73 24 25 13 43 2 57 60 -18 -73 51 5 -72 57 59 -75 9 40 -71 42 28 -161 0 0 -73 47 58 13 43 6 57 58 -17 -74 14 11 -73 21 57 -75 31 27 -72 7 36 -160 0 0 -74 10 24 13 43 9 57 57 -17 -74 36 12 -73 44 48 -75 52 10 -72 31 37 -159 0 0 -74 31 48 13 43 12 57 55 -16 -74 57 11 -74 6 36 -76 11 54 -72 54 32 -158 0 0 -74 52 12 13 43 15 57 53 -16 -75 17 11 -74 27 24 -76 30 41 -73 16 27 -157 0 0 -75 11 40 13 43 18 57 52 -15 -75 36 15 -74 47 15 -76 48 34 -73 37 23 -156 0 0 -75 30 15 13 43 20 57 50 -15 -75 54 27 -75 6 13 -77 5 36 -73 57 23 -155 0 0 -75 47 59 13 43 23 57 49 -15 -76 11 49 -75 24 19 -77 21 51 -74 16 30 -154 0 0 -76 4 56 13 43 25 57 47 -14 -76 28 24 -75 41 36 -77 37 20 -74 34 47 -153 0 0 -76 21 6 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53 56 27 -10 -79 16 29 -78 37 37 -80 13 28 -77 41 52 -139 0 0 -79 5 43 13 43 55 56 25 -10 -79 24 58 -78 46 32 -80 21 19 -77 51 23 -138 0 0 -79 14 3 13 43 56 56 24 -10 -79 33 6 -78 55 5 -80 28 49 -78 0 31 -137 0 0 -79 22 2 13 43 58 56 23 -9 -79 40 52 -79 3 15 -80 36 0 -78 9 15 -136 0 0 -79 29 40 13 43 59 56 21 -9 -79 48 19 -79 11 5 -80 42 52 -78 17 38 -135 0 0 -79 36 59 13 44 1 56 20 -9 -79 55 27 -79 18 35 -80 49 27 -78 25 39 -134 0 0 -79 43 59 13 44 2 56 19 -9 -80 2 16 -79 25 46 -80 55 44 -78 33 20 -133 0 0 -79 50 41 13 44 4 56 18 -9 -80 8 48 -79 32 38 -81 1 45 -78 40 41 -132 0 0 -79 57 5 13 44 5 56 16 -8 -80 15 2 -79 39 12 -81 7 30 -78 47 44 -131 0 0 -80 3 13 13 44 6 56 15 -8 -80 21 1 -79 45 30 -81 13 0 -78 54 28 -130 0 0 -80 9 5 13 44 8 56 14 -8 -80 26 43 -79 51 31 -81 18 15 -79 0 54 -129 0 0 -80 14 41 13 44 9 56 12 -8 -80 32 11 -79 57 16 -81 23 17 -79 7 4 -128 0 0 -80 20 2 13 44 10 56 11 -8 -80 37 24 -80 2 45 -81 28 5 -79 12 57 -127 0 0 -80 25 9 13 44 12 56 10 -7 -80 42 22 -80 8 0 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13 13 44 40 54 337 -3 -81 47 38 -81 16 51 -82 32 35 -80 32 33 - 99 0 0 -81 32 32 13 44 41 54 336 -3 -81 47 56 -81 17 11 -82 32 52 -80 32 53 - 98 0 0 -81 32 43 13 44 42 54 335 -3 -81 48 6 -81 17 21 -82 33 1 -80 33 5 - 97 0 0 -81 32 45 13 44 43 54 334 -3 -81 48 9 -81 17 24 -82 33 3 -80 33 7 - 96 0 0 -81 32 39 13 44 44 54 332 -3 -81 48 3 -81 17 17 -82 32 57 -80 33 0 - 95 0 0 -81 32 24 13 44 45 54 331 -3 -81 47 48 -81 17 2 -82 32 45 -80 32 44 - 94 0 0 -81 32 1 13 44 46 54 330 -2 -81 47 26 -81 16 39 -82 32 24 -80 32 19 - 93 0 0 -81 31 30 13 44 47 54 329 -2 -81 46 56 -81 16 7 -82 31 56 -80 31 44 - 92 0 0 -81 30 50 13 44 48 54 328 -2 -81 46 17 -81 15 26 -82 31 21 -80 31 1 - 91 0 0 -81 30 2 13 44 49 54 326 -2 -81 45 31 -81 14 37 -82 30 38 -80 30 7 - 90 0 0 -81 29 6 13 44 50 53 325 -2 -81 44 35 -81 13 38 -82 29 48 -80 29 5 - 89 0 0 -81 28 0 13 44 51 53 324 -2 -81 43 32 -81 12 31 -82 28 50 -80 27 53 - 88 0 0 -81 26 46 13 44 52 53 323 -2 -81 42 20 -81 11 15 -82 27 44 -80 26 31 - 87 0 0 -81 25 24 13 44 53 53 322 -1 -81 41 0 -81 9 51 -82 26 30 -80 24 59 - 86 0 0 -81 23 52 13 44 54 53 321 -1 -81 39 31 -81 8 16 -82 25 8 -80 23 18 - 85 0 0 -81 22 12 13 44 55 53 319 -1 -81 37 53 -81 6 33 -82 23 39 -80 21 27 - 84 0 0 -81 20 22 13 44 56 53 318 -1 -81 36 6 -81 4 40 -82 22 1 -80 19 26 - 83 0 0 -81 18 23 13 44 57 53 317 -1 -81 34 10 -81 2 38 -82 20 15 -80 17 14 - 82 0 0 -81 16 14 13 44 58 53 316 -1 -81 32 5 -81 0 26 -82 18 20 -80 14 53 - 81 0 0 -81 13 56 13 44 59 53 315 -1 -81 29 51 -80 58 5 -82 16 17 -80 12 20 - 80 0 0 -81 11 29 13 45 0 53 314 0 -81 27 27 -80 55 33 -82 14 5 -80 9 37 - 79 0 0 -81 8 51 13 45 1 53 312 0 -81 24 54 -80 52 51 -82 11 44 -80 6 43 - 78 0 0 -81 6 3 13 45 2 53 311 0 -81 22 11 -80 49 58 -82 9 15 -80 3 37 Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 7.0] Data for the target star ------------------------ * name: UCAC2 12110024 * constellation : Telescopium * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 36 26.1357 DE: -46 25 28.123 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 11.3 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 279.2667927464 DE(deg): -46.4169461385 * Equation of equinoxes (radians) : 0.000040859061352 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1000) Piazzia approx. diameter [km]: 48 approx. diameter ["]: .033 distance from Earth [AU]: 2.03300 * orbital information: orbit source: Preston date of fit: 2008 Feb 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 718 number of rejected observations: 36 time covered by the observations: 1923 Aug 13 - 2007 May 20 1 sigma uncertainty ellipse (major, minor, PA): 0.060, 0.032, 64° remarks: * orbital elements for (1000) Piazzia : Mean anomaly = 2.29134775 deg Arg. of pericenter = 281.56503494 deg Long. of node = 323.81279834 deg Inclination = 20.55740956 deg Eccentricity = 0.25519275 Semimajor axis = 3.17629885 AU Perihelion dist = 2.36573041 AU Mag: H = 10.57, G = 0.15 Epoch of elements : MJD 54559.57200000 TDT (2008 Apr 03.572) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 3 1000 Piazzia 13h 43.3m UT 11.3 18 36 26.136-46 25 28.12UCAC2 12110024 0.0 14.2 48 2.9 2.033 3.769 -11.37 -118.9871 -46.422 -25.04 5.59 13.7224 -0.15068 -0.52045 9.00970 -2.62766 -0.00556 -0.00011 2000 0.6247742008 325.00000281.565035323.812798 20.5574100.25519275 3.1762989 2.3657304 9.6 5.00.15 RATE 1.7410930 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.064 0.039 67 2.45 0.048 0 54532.5020080403_110024 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 07, 13:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org