IOTA/IOTA-ES occultation update for (2151) Hadwiger / HIP 61558 event on 2008 Jul 05, 09:36 UT Visible from New Zealand, Australia Summary ------- On 2008 Jul 05 UT, the 20 km diameter asteroid (2151) Hadwiger will occult a 5.9 mag star in the constellation Virgo for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 10.3 mag to 16.2 mag (the magnitude of the asteroid) for at most 1.1 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: . The event at a glimpse ---------------------- * Rank: 32 * date and approx. time of event: 2008 Jul 05, 09:36 - 2008 Jul 05, 09:41 UT * midpoint of event [JD]: 2454652.90014167 * magnitude of target star: 5.9 * magnitude drop [mag]: 10.3 * estimated maximum duration [s]: 1.1 * Moon: 7 % sunlit, 56° distance * Sun: 87° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 2.07 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .023", 145° ) * approx speed of asteroid's shadow [km/s]: 18.6635 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 61558 by 2151 Hadwiger on 2008 Jul 5 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 Latitude Latitude Latitude Latitude 124 0 0 -10 3 28 9 36 40 85 328 -1 -10 10 14 - 9 56 41 -10 38 17 - 9 28 39 125 0 0 -10 47 43 9 36 47 84 323 -2 -10 54 28 -10 40 57 -11 22 28 -10 12 58 126 0 0 -11 31 36 9 36 54 83 320 -4 -11 38 21 -11 24 51 -12 6 17 -10 56 56 127 0 0 -12 15 6 9 37 2 81 318 -5 -12 21 49 -12 8 22 -12 49 42 -11 40 30 128 0 0 -12 58 10 9 37 9 80 316 -6 -13 4 53 -12 51 28 -13 32 41 -12 23 40 129 0 0 -13 40 49 9 37 16 79 314 -7 -13 47 31 -13 34 7 -14 15 14 -13 6 24 130 0 0 -14 23 0 9 37 23 78 313 -8 -14 29 40 -14 16 19 -14 57 19 -13 48 41 131 0 0 -15 4 42 9 37 30 77 312 -10 -15 11 21 -14 58 2 -15 38 55 -14 30 29 132 0 0 -15 45 53 9 37 37 75 311 -11 -15 52 31 -15 39 15 -16 20 0 -15 11 47 133 0 0 -16 26 34 9 37 44 74 311 -12 -16 33 11 -16 19 57 -17 0 34 -15 52 34 134 0 0 -17 6 42 9 37 51 73 310 -13 -17 13 17 -17 0 6 -17 40 35 -16 32 49 135 0 0 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302 -28 -25 31 26 -25 18 58 -25 57 16 -24 53 8 149 0 0 -25 55 58 9 39 21 56 301 -29 -26 2 11 -25 49 46 -26 27 55 -25 24 3 150 0 0 -26 26 5 9 39 26 55 301 -30 -26 32 16 -26 19 54 -26 57 53 -25 54 17 151 0 0 -26 55 32 9 39 31 54 300 -31 -27 1 41 -26 49 22 -27 27 12 -26 23 52 152 0 0 -27 24 18 9 39 36 53 300 -32 -27 30 26 -27 18 10 -27 55 50 -26 52 47 153 0 0 -27 52 25 9 39 41 52 299 -33 -27 58 32 -27 46 19 -28 23 49 -27 21 2 154 0 0 -28 19 53 9 39 46 51 299 -34 -28 25 58 -28 13 48 -28 51 9 -27 48 37 155 0 0 -28 46 41 9 39 50 50 298 -35 -28 52 44 -28 40 37 -29 17 49 -28 15 33 156 0 0 -29 12 49 9 39 55 49 298 -36 -29 18 51 -29 6 47 -29 43 49 -28 41 49 157 0 0 -29 38 18 9 39 59 48 297 -37 -29 44 18 -29 32 17 -30 9 10 -29 7 26 158 0 0 -30 3 8 9 40 4 47 297 -38 -30 9 7 -29 57 9 -30 33 53 -29 32 23 159 0 0 -30 27 19 9 40 8 46 296 -39 -30 33 16 -30 21 21 -30 57 56 -29 56 41 160 0 0 -30 50 51 9 40 12 45 296 -40 -30 56 47 -30 44 55 -31 21 21 -30 20 21 161 0 0 -31 13 45 9 40 16 44 295 -41 -31 19 39 -31 7 50 -31 44 8 -30 43 22 162 0 0 -31 36 1 9 40 20 43 294 -42 -31 41 54 -31 30 7 -32 6 16 -31 5 45 163 0 0 -31 57 38 9 40 24 43 294 -42 -32 3 30 -31 51 46 -32 27 47 -31 27 30 164 0 0 -32 18 38 9 40 27 42 293 -43 -32 24 29 -32 12 48 -32 48 40 -31 48 37 165 0 0 -32 39 1 9 40 31 41 293 -44 -32 44 50 -32 33 12 -33 8 56 -32 9 6 166 0 0 -32 58 47 9 40 35 40 292 -45 -33 4 35 -32 52 59 -33 28 35 -32 28 59 167 0 0 -33 17 56 9 40 38 39 292 -46 -33 23 42 -33 12 9 -33 47 38 -32 48 14 168 0 0 -33 36 28 9 40 41 38 291 -47 -33 42 14 -33 30 43 -34 6 4 -33 6 53 169 0 0 -33 54 24 9 40 45 37 291 -47 -34 0 9 -33 48 40 -34 23 54 -33 24 55 170 0 0 -34 11 45 9 40 48 36 290 -48 -34 17 28 -34 6 2 -34 41 9 -33 42 21 171 0 0 -34 28 29 9 40 51 35 289 -49 -34 34 11 -34 22 47 -34 57 47 -33 59 12 172 0 0 -34 44 39 9 40 54 34 289 -50 -34 50 20 -34 38 58 -35 13 51 -34 15 27 173 0 0 -35 0 13 9 40 57 34 288 -51 -35 5 53 -34 54 33 -35 29 20 -34 31 7 174 0 0 -35 15 13 9 41 0 33 288 -52 -35 20 52 -35 9 34 -35 44 15 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0 -37 46 58 9 41 31 21 279 -62 -37 52 26 -37 41 30 -38 15 5 -37 18 52 -171 0 0 -37 53 49 9 41 33 20 278 -62 -37 59 16 -37 48 21 -38 21 53 -37 25 45 -170 0 0 -38 0 8 9 41 34 19 278 -63 -38 5 36 -37 54 41 -38 28 10 -37 32 7 -169 0 0 -38 5 58 9 41 36 19 277 -64 -38 11 24 -38 0 31 -38 33 57 -37 37 58 -168 0 0 -38 11 16 9 41 37 18 277 -64 -38 16 42 -38 5 50 -38 39 14 -37 43 19 -167 0 0 -38 16 4 9 41 39 17 276 -65 -38 21 30 -38 10 38 -38 44 0 -37 48 9 -166 0 0 -38 20 22 9 41 40 16 275 -66 -38 25 47 -38 14 56 -38 48 16 -37 52 28 -165 0 0 -38 24 9 9 41 41 15 275 -66 -38 29 35 -38 18 44 -38 52 2 -37 56 17 -164 0 0 -38 27 27 9 41 43 15 274 -67 -38 32 52 -38 22 2 -38 55 18 -37 59 36 -163 0 0 -38 30 14 9 41 44 14 274 -67 -38 35 39 -38 24 49 -38 58 5 -38 2 24 -162 0 0 -38 32 32 9 41 45 13 273 -68 -38 37 57 -38 27 7 -39 0 22 -38 4 43 -161 0 0 -38 34 20 9 41 46 12 272 -69 -38 39 44 -38 28 55 -39 2 9 -38 6 31 -160 0 0 -38 35 38 9 41 47 12 272 -69 -38 41 2 -38 30 13 -39 3 26 -38 7 50 -159 0 0 -38 36 26 9 41 48 11 271 -70 -38 41 51 -38 31 2 -39 4 14 -38 8 38 -158 0 0 -38 36 45 9 41 49 10 270 -70 -38 42 9 -38 31 20 -39 4 33 -38 8 57 -157 0 0 -38 36 34 9 41 49 9 270 -71 -38 41 58 -38 31 9 -39 4 22 -38 8 46 -156 0 0 -38 35 53 9 41 50 8 269 -71 -38 41 18 -38 30 29 -39 3 42 -38 8 5 -155 0 0 -38 34 43 9 41 51 8 269 -72 -38 40 8 -38 29 18 -39 2 32 -38 6 54 -154 0 0 -38 33 3 9 41 51 7 268 -72 -38 38 28 -38 27 39 -39 0 53 -38 5 14 -153 0 0 -38 30 54 9 41 52 6 267 -72 -38 36 19 -38 25 29 -38 58 44 -38 3 4 -152 0 0 -38 28 15 9 41 52 5 267 -73 -38 33 40 -38 22 50 -38 56 6 -38 0 24 -151 0 0 -38 25 6 9 41 53 4 266 -73 -38 30 32 -38 19 41 -38 52 59 -37 57 14 -150 0 0 -38 21 28 9 41 53 4 265 -74 -38 26 54 -38 16 2 -38 49 22 -37 53 34 -149 0 0 -38 17 20 9 41 53 3 265 -74 -38 22 46 -38 11 54 -38 45 15 -37 49 25 -148 0 0 -38 12 42 9 41 54 2 264 -74 -38 18 8 -38 7 15 -38 40 39 -37 44 45 -147 0 0 -38 7 34 9 41 54 1 264 -74 -38 13 0 -38 2 7 -38 35 33 -37 39 35 -146 0 0 -38 1 56 9 41 54 1 263 -75 -38 7 23 -37 56 29 -38 29 57 -37 33 55 Uncertainty in time = +/- 2 secs [Prediction of 2008 May 26.0] Data for the target star ------------------------ * name: HIP 61558 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 36 47.3380 DE: -05 49 54.994 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .011, .009 ) * V mag [mag]: 5.9 * B mag [mag]: 6.0 * Apparent position with proper motion RA(deg): 189.3095306834 DE(deg): -5.8803126310 * Equation of equinoxes (radians) : 0.000051964384424 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2151) Hadwiger approx. diameter [km]: 20 approx. diameter ["]: .011 distance from Earth [AU]: 2.42300 * orbital information: orbit source: Preston date of fit: 2008 May 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 640 number of rejected observations: 27 time covered by the observations: 1934 Mar 07 - 2008 May 06 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.020, 140° remarks: * orbital elements for (2151) Hadwiger : Mean anomaly = 94.66127259 deg Arg. of pericenter = 84.92645615 deg Long. of node = 28.07903131 deg Inclination = 15.46708268 deg Eccentricity = 0.05713048 Semimajor axis = 2.56100708 AU Perihelion dist = 2.41469552 AU Mag: H = 10.87, G = 0.15 Epoch of elements : MJD 54652.40000000 TDT (2008 Jul 05.400) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 5 2151 Hadwiger 9h 36.2m UT 5.9 12 36 47.338- 5 49 54.99HIP 61558 6.0 16.2 20 1.1 2.423 2.067 -22.58 121.3889 -5.826 37.11 22.73 9.6034 -0.01957 -0.02459 8.49914 -6.22363 0.00505 -0.00217 2000 94.0841092008 7 3.00000 84.926456 28.079031 15.4670830.05713048 2.5610071 2.414695511.1 5.00.15 RATE 2.4048500 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.025 0.023 145 3.07 0.023 0 54612.5020080705__61558 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 26, 16:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org