IOTA/IOTA-ES occultation update for (456) Abnoba / TYC 5187-00323-1 event on 2012 Nov 28, 08:32 UT Visible from New Zealand Summary ------- On 2012 Nov 28 UT, the 43 km diameter asteroid (456) Abnoba will occult a 9.3 mag star in the constellation Aquarius for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 14.7 mag (the magnitude of the asteroid) for at most 1.4 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: 58 * date and approx. time of event: 2012 Nov 28, 08:33 - 2012 Nov 28, 08:34 UT * geocentric midpoint of event [JD]: 2456259.85564167 * magnitude of target star: 9.3 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 1.4 * Moon: 100 % sunlit, 108° distance * Sun: 69° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 60 * 1 sigma uncertainty interval [path widths]: +/- 1.07 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .021", 86° ) * approx speed of asteroid's shadow [km/s]: 29.6888 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5187-00323-1 by 456 Abnoba on 2012 Nov 28 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 162 0 0 -44 41 0 8 33 42 34 303 0 -44 57 36 -44 24 28 -45 33 26 -43 49 20 163 0 0 -44 34 33 8 33 44 33 302 -1 -44 51 10 -44 18 1 -45 26 59 -43 42 53 164 0 0 -44 28 6 8 33 46 33 301 -2 -44 44 43 -44 11 34 -45 20 32 -43 36 27 165 0 0 -44 21 39 8 33 49 32 300 -2 -44 38 16 -44 5 7 -45 14 6 -43 30 0 166 0 0 -44 15 13 8 33 51 31 299 -3 -44 31 50 -43 58 41 -45 7 39 -43 23 34 167 0 0 -44 8 47 8 33 53 31 298 -4 -44 25 24 -43 52 15 -45 1 13 -43 17 8 168 0 0 -44 2 21 8 33 55 30 297 -4 -44 18 58 -43 45 50 -44 54 47 -43 10 43 169 0 0 -43 55 57 8 33 56 30 296 -5 -44 12 33 -43 39 25 -44 48 22 -43 4 18 170 0 0 -43 49 33 8 33 58 29 295 -6 -44 6 9 -43 33 1 -44 41 58 -42 57 54 171 0 0 -43 43 10 8 34 0 28 294 -6 -43 59 46 -43 26 38 -44 35 35 -42 51 31 172 0 0 -43 36 48 8 34 2 28 293 -7 -43 53 24 -43 20 16 -44 29 13 -42 45 9 173 0 0 -43 30 27 8 34 4 27 292 -8 -43 47 3 -43 13 55 -44 22 52 -42 38 49 174 0 0 -43 24 7 8 34 6 27 292 -8 -43 40 43 -43 7 36 -44 16 32 -42 32 30 175 0 0 -43 17 49 8 34 7 26 291 -9 -43 34 25 -43 1 18 -44 10 13 -42 26 12 176 0 0 -43 11 33 8 34 9 25 290 -10 -43 28 9 -42 55 1 -44 3 56 -42 19 56 177 0 0 -43 5 18 8 34 11 25 289 -10 -43 21 54 -42 48 47 -43 57 41 -42 13 41 178 0 0 -42 59 5 8 34 12 24 288 -11 -43 15 41 -42 42 34 -43 51 28 -42 7 28 179 0 0 -42 52 54 8 34 14 23 287 -11 -43 9 29 -42 36 23 -43 45 17 -42 1 18 180 0 0 -42 46 45 8 34 15 23 286 -12 -43 3 20 -42 30 14 -43 39 7 -41 55 9 -179 0 0 -42 40 38 8 34 17 22 286 -13 -42 57 14 -42 24 7 -43 33 0 -41 49 3 -178 0 0 -42 34 34 8 34 18 21 285 -13 -42 51 9 -42 18 3 -43 26 55 -41 42 59 -177 0 0 -42 28 32 8 34 20 21 284 -14 -42 45 7 -42 12 1 -43 20 53 -41 36 58 -176 0 0 -42 22 33 8 34 21 20 283 -14 -42 39 8 -42 6 2 -43 14 53 -41 30 59 -175 0 0 -42 16 36 8 34 23 19 283 -15 -42 33 11 -42 0 6 -43 8 56 -41 25 3 -174 0 0 -42 10 42 8 34 24 18 282 -15 -42 27 17 -41 54 12 -43 3 2 -41 19 9 -173 0 0 -42 4 52 8 34 25 18 281 -16 -42 21 26 -41 48 22 -42 57 11 -41 13 19 -172 0 0 -41 59 4 8 34 26 17 280 -17 -42 15 38 -41 42 34 -42 51 23 -41 7 32 -171 0 0 -41 53 20 8 34 27 16 280 -17 -42 9 54 -41 36 50 -42 45 38 -41 1 48 -170 0 0 -41 47 39 8 34 28 16 279 -18 -42 4 13 -41 31 9 -42 39 56 -40 56 8 -169 0 0 -41 42 1 8 34 30 15 278 -18 -41 58 35 -41 25 32 -42 34 18 -40 50 31 -168 0 0 -41 36 27 8 34 31 14 277 -19 -41 53 1 -41 19 58 -42 28 43 -40 44 57 -167 0 0 -41 30 57 8 34 31 13 277 -19 -41 47 30 -41 14 28 -42 23 13 -40 39 28 -166 0 0 -41 25 30 8 34 32 13 276 -20 -41 42 4 -41 9 2 -42 17 46 -40 34 2 -165 0 0 -41 20 8 8 34 33 12 275 -20 -41 36 41 -41 3 39 -42 12 22 -40 28 40 -164 0 0 -41 14 49 8 34 34 11 275 -21 -41 31 22 -40 58 21 -42 7 3 -40 23 22 -163 0 0 -41 9 35 8 34 35 10 274 -21 -41 26 8 -40 53 7 -42 1 49 -40 18 8 -162 0 0 -41 4 25 8 34 35 10 273 -22 -41 20 58 -40 47 57 -41 56 38 -40 12 59 -161 0 0 -40 59 19 8 34 36 9 273 -22 -41 15 52 -40 42 52 -41 51 32 -40 7 54 -160 0 0 -40 54 18 8 34 37 8 272 -22 -41 10 50 -40 37 51 -41 46 30 -40 2 53 -159 0 0 -40 49 22 8 34 37 7 271 -23 -41 5 54 -40 32 55 -41 41 33 -39 57 57 -158 0 0 -40 44 30 8 34 38 7 271 -23 -41 1 2 -40 28 3 -41 36 40 -39 53 6 -157 0 0 -40 39 43 8 34 38 6 270 -24 -40 56 15 -40 23 16 -41 31 53 -39 48 20 -156 0 0 -40 35 1 8 34 39 5 269 -24 -40 51 32 -40 18 34 -41 27 10 -39 43 38 -155 0 0 -40 30 24 8 34 39 4 269 -25 -40 46 55 -40 13 57 -41 22 32 -39 39 2 -154 0 0 -40 25 52 8 34 39 4 268 -25 -40 42 23 -40 9 26 -41 18 0 .. .. .. -153 0 0 -40 21 25 8 34 39 3 267 -25 -40 37 56 -40 4 59 -41 13 32 .. .. .. -152 0 0 -40 17 4 8 34 40 2 267 -26 -40 33 34 -40 0 38 -41 9 10 .. .. .. -151 0 0 -40 12 48 8 34 40 1 266 -26 -40 29 18 -39 56 22 -41 4 53 .. .. .. -150 0 0 -40 8 37 8 34 40 0 265 -26 -40 25 7 -39 52 11 -41 0 42 .. .. .. Uncertainty in time = +/- 2 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 5187-00323-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 54 08.8784 DE: -03 54 41.020 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 9.3 * B mag [mag]: 10.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (456) Abnoba approx. diameter [km]: 43 approx. diameter ["]: .020 distance from Earth [AU]: 2.96100 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1092 number of rejected observations: 67 time covered by the observations: 1900 Jun 15 - 2012 Oct 27 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.007, 74° remarks: * orbital elements for (456) Abnoba : Mean anomaly = 77.44432293 deg Arg. of pericenter = 6.82809960 deg Long. of node = 229.32740769 deg Inclination = 14.44336624 deg Eccentricity = 0.18063307 Semimajor axis = 2.78655537 AU Perihelion dist = 2.28321131 AU Mag: H = 9.05, G = 0.15 Epoch of elements : MJD 56259.35600000 TDT (2012 Nov 28.356) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 28 456 Abnoba 8h 32.1m UT 9.3 20 54 8.878- 3 54 41.02TYC 5187-00323-1 10.4 14.7 43 1.4 2.961 3.315 4.03 117.8573 -3.913 48.99 -21.40 8.5354 0.05807 -0.69944 16.70244 1.35352 0.00511 0.00200 2000 75.46191620121119.00000 6.828100229.327408 14.4433660.18063307 2.7865554 2.2832113 9.2 5.00.15 RATE 2.1188620 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.023 0.021 86 2.07 0.021 0 0 4 0 056247.0020121128_0323-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 09:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org