IOTA/IOTA-ES occultation update for (3062) Wren / TYC 6896-00018-1 event on 2012 Nov 26, 09:44 UT Visible from New Zealand Summary ------- On 2012 Nov 26 UT, the 24 km diameter asteroid (3062) Wren will occult a 9.5 mag star in the constellation Sagittarius 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 6.9 mag to 16.4 mag (the magnitude of the asteroid) for at most 0.7 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: 17 * date and approx. time of event: 2012 Nov 26, 09:45 - 2012 Nov 26, 09:46 UT * geocentric midpoint of event [JD]: 2456257.90594167 * magnitude of target star: 9.5 * magnitude drop [mag]: 6.9 * estimated maximum duration [s]: 0.7 * Moon: 96 % sunlit, 104° distance * Sun: 53° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 3.85 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .038", 91° ) * approx speed of asteroid's shadow [km/s]: 35.0118 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6896-00018-1 by 3062 Wren on 2012 Nov 26 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 149 0 0 -51 21 29 9 45 56 37 276 0 -51 32 0 -51 11 0 -52 54 6 -49 51 25 150 0 0 -50 55 12 9 45 58 36 275 -1 -51 5 43 -50 44 42 -52 27 58 -49 24 59 151 0 0 -50 28 33 9 46 0 35 274 -2 -50 39 6 -50 18 3 -52 1 27 -48 58 14 152 0 0 -50 1 34 9 46 2 35 273 -2 -50 12 7 -49 51 3 -51 34 34 -48 31 8 153 0 0 -49 34 14 9 46 4 34 271 -3 -49 44 48 -49 23 42 -51 7 20 -48 3 43 154 0 0 -49 6 35 9 46 6 34 270 -4 -49 17 9 -48 56 2 -50 39 46 -47 35 59 155 0 0 -48 38 36 9 46 8 33 269 -5 -48 49 11 -48 28 4 -50 11 52 -47 7 57 156 0 0 -48 10 20 9 46 10 32 268 -6 -48 20 55 -47 59 46 -49 43 39 -46 39 37 157 0 0 -47 41 45 9 46 12 31 267 -6 -47 52 21 -47 31 12 -49 15 6 -46 11 0 158 0 0 -47 12 54 9 46 13 31 266 -7 -47 23 29 -47 2 20 -48 46 16 -45 42 7 159 0 0 -46 43 46 9 46 15 30 265 -8 -46 54 22 -46 33 12 -48 17 9 -45 12 59 160 0 0 -46 14 23 9 46 17 29 264 -9 -46 24 59 -46 3 49 -47 47 46 -44 43 36 161 0 0 -45 44 45 9 46 19 29 263 -10 -45 55 21 -45 34 12 -47 18 7 -44 14 0 162 0 0 -45 14 54 9 46 21 28 262 -11 -45 25 29 -45 4 21 -46 48 14 -43 44 11 163 0 0 -44 44 50 9 46 22 27 262 -11 -44 55 25 -44 34 17 -46 18 7 -43 14 9 164 0 0 -44 14 34 9 46 24 26 261 -12 -44 25 9 -44 4 1 -45 47 47 -42 43 57 165 0 0 -43 44 7 9 46 26 25 260 -13 -43 54 41 -43 33 35 -45 17 15 -42 13 35 166 0 0 -43 13 31 9 46 27 25 259 -14 -43 24 4 -43 2 59 -44 46 33 -41 43 3 167 0 0 -42 42 45 9 46 29 24 258 -15 -42 53 18 -42 32 14 -44 15 41 -41 12 24 168 0 0 -42 11 52 9 46 30 23 257 -16 -42 22 23 -42 1 22 -43 44 40 -40 41 37 169 0 0 -41 40 51 9 46 32 22 256 -17 -41 51 22 -41 30 22 -43 13 32 -40 10 44 170 0 0 -41 9 45 9 46 33 21 256 -18 -41 20 15 -40 59 17 -42 42 17 -39 39 47 171 0 0 -40 38 35 9 46 35 20 255 -18 -40 49 3 -40 28 8 -42 10 56 -39 8 45 172 0 0 -40 7 20 9 46 36 20 254 -19 -40 17 48 -39 56 54 -41 39 31 -38 37 40 173 0 0 -39 36 3 9 46 37 19 253 -20 -39 46 30 -39 25 39 -41 8 3 -38 6 34 174 0 0 -39 4 45 9 46 38 18 253 -21 -39 15 10 -38 54 22 -40 36 33 -37 35 26 175 0 0 -38 33 27 9 46 40 17 252 -22 -38 43 51 -38 23 5 -40 5 2 -37 4 19 176 0 0 -38 2 9 9 46 41 16 251 -23 -38 12 31 -37 51 49 -39 33 32 -36 33 14 177 0 0 -37 30 53 9 46 42 15 251 -24 -37 41 14 -37 20 34 -39 2 2 -36 2 11 178 0 0 -36 59 41 9 46 43 14 250 -25 -37 10 0 -36 49 23 -38 30 35 -35 31 11 179 0 0 -36 28 32 9 46 44 13 249 -25 -36 38 50 -36 18 16 -37 59 12 -35 0 17 180 0 0 -35 57 29 9 46 45 12 249 -26 -36 7 45 -35 47 15 -37 27 53 -34 29 28 -179 0 0 -35 26 32 9 46 45 11 248 -27 -35 36 46 -35 16 20 -36 56 40 -33 58 45 -178 0 0 -34 55 42 9 46 46 10 247 -28 -35 5 55 -34 45 32 -36 25 34 -33 28 11 -177 0 0 -34 25 1 9 46 47 9 247 -29 -34 35 12 -34 14 53 -35 54 37 -32 57 45 -176 0 0 -33 54 30 9 46 48 8 246 -30 -34 4 38 -33 44 23 -35 23 48 -32 27 29 -175 0 0 -33 24 9 9 46 48 7 246 -31 -33 34 15 -33 14 4 -34 53 10 .. .. .. -174 0 0 -32 53 59 9 46 49 6 245 -31 -33 4 4 -32 43 56 -34 22 43 .. .. .. -173 0 0 -32 24 2 9 46 49 5 245 -32 -32 34 5 -32 14 1 -33 52 28 .. .. .. -172 0 0 -31 54 19 9 46 49 4 244 -33 -32 4 20 -31 44 20 -33 22 26 .. .. .. -171 0 0 -31 24 50 9 46 50 3 243 -34 -31 34 49 -31 14 53 -32 52 39 .. .. .. -170 0 0 -30 55 37 9 46 50 3 243 -35 -31 5 33 -30 45 42 -32 23 7 .. .. .. -169 0 0 -30 26 39 9 46 50 2 242 -35 -30 36 34 -30 16 47 -31 53 51 .. .. .. -168 0 0 -29 57 59 9 46 50 1 242 -36 -30 7 52 -29 48 9 -31 24 53 .. .. .. Uncertainty in time = +/- 3 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 6896-00018-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 59 33.9690 DE: -24 26 33.951 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .028 ) * V mag [mag]: 9.5 * B mag [mag]: 11.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3062) Wren approx. diameter [km]: 24 approx. diameter ["]: .010 distance from Earth [AU]: 3.35400 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 856 number of rejected observations: 23 time covered by the observations: 1942 Mar 14 - 2012 Sep 13 1 sigma uncertainty ellipse (major, minor, PA): 0.037, 0.026, 91° remarks: * orbital elements for (3062) Wren : Mean anomaly = 302.90734365 deg Arg. of pericenter = 271.46782012 deg Long. of node = 110.36651643 deg Inclination = 11.33893376 deg Eccentricity = 0.10998213 Semimajor axis = 3.01933483 AU Perihelion dist = 2.68726194 AU Mag: H = 10.77, G = 0.15 Epoch of elements : MJD 56257.40600000 TDT (2012 Nov 26.406) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 26 3062 Wren 9h 44.6m UT 9.5 19 59 33.969-24 26 33.95TYC 6896-00018-1 11.1 16.4 24 0.7 3.354 3.756 7.40 88.0256 -24.445 30.72 -21.05 9.7426 0.09633 -0.64824 19.55934 2.82054 0.00464 0.00070 2000 301.51604420121119.00000271.467820110.366516 11.3389340.10998213 3.0193348 2.687262010.6 5.00.15 RATE 1.8786120 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.045 0.038 91 4.85 0.038 0 0 0-1 056247.0020121126_0018-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 20:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org