IOTA/IOTA-ES occultation update for (829) Academia / TYC 2402-00481-1 event on 2012 Nov 26, 05:36 UT Visible from Europe, Alaska Summary ------- On 2012 Nov 26 UT, the 41 km diameter asteroid (829) Academia will occult a 10.2 mag star in the constellation Auriga for observers along a path across Europe, Alaska. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 14.0 mag (the magnitude of the asteroid) for at most 4.4 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 79 * date and approx. time of event: 2012 Nov 26, 05:28 - 2012 Nov 26, 05:45 UT * geocentric midpoint of event [JD]: 2456257.7337125 * magnitude of target star: 10.2 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 4.4 * Moon: 95 % sunlit, 44° distance * Sun: 158° distance * rough path description: Europe, Alaska The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 0.70 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .028", 88° ) * approx speed of asteroid's shadow [km/s]: 9.2596 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2402-00481-1 by 829 Academia 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 167 0 0 35 25 42 5 45 29 0 43 -2 35 46 22 35 5 9 36 15 34 .. .. .. 168 0 0 36 18 55 5 45 29 2 44 -3 36 39 44 35 58 15 37 9 7 .. .. .. 169 0 0 37 12 8 5 45 28 3 44 -4 37 33 5 36 51 20 38 2 40 36 22 28 170 0 0 38 5 19 5 45 27 4 45 -5 38 26 23 37 44 23 38 56 9 37 15 21 171 0 0 38 58 24 5 45 25 5 46 -6 39 19 35 38 37 21 39 49 32 38 8 9 172 0 0 39 51 20 5 45 23 6 46 -7 40 12 39 39 30 11 40 42 45 39 0 49 173 0 0 40 44 4 5 45 21 7 47 -8 41 5 30 40 22 49 41 35 46 39 53 18 174 0 0 41 36 35 5 45 19 9 47 -9 41 58 6 41 15 12 42 28 32 40 45 33 175 0 0 42 28 47 5 45 16 10 48 -10 42 50 25 42 7 19 43 20 59 41 37 32 176 0 0 43 20 39 5 45 13 11 49 -11 43 42 23 42 59 6 44 13 6 42 29 11 177 0 0 44 12 9 5 45 9 12 50 -12 44 33 57 43 50 30 45 4 48 43 20 28 178 0 0 45 3 12 5 45 6 13 50 -13 45 25 6 44 41 29 45 56 3 44 11 21 179 0 0 45 53 47 5 45 2 14 51 -14 46 15 45 45 31 59 46 46 49 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40 278 -18 57 52 41 57 8 57 58 23 44 56 38 46 4 0 0 56 52 1 5 31 24 39 279 -17 57 14 2 56 30 12 57 45 9 55 59 56 5 0 0 56 12 27 5 31 16 39 280 -17 56 34 30 55 50 35 57 5 42 55 20 15 6 0 0 55 32 2 5 31 7 38 282 -16 55 54 8 55 10 7 56 25 23 54 39 45 7 0 0 54 50 47 5 30 59 37 283 -15 55 12 54 54 28 50 55 44 12 53 58 25 8 0 0 54 8 42 5 30 51 37 284 -15 54 30 51 53 46 45 55 2 11 53 16 18 9 0 0 53 25 50 5 30 42 36 285 -14 53 47 59 53 3 51 54 19 20 52 33 23 10 0 0 52 42 10 5 30 34 35 286 -13 53 4 20 52 20 11 53 35 41 51 49 43 11 0 0 51 57 44 5 30 25 34 288 -12 52 19 54 51 35 46 52 51 14 51 5 18 12 0 0 51 12 35 5 30 17 34 289 -12 51 34 43 50 50 37 52 6 2 50 20 11 13 0 0 50 26 42 5 30 9 33 290 -11 50 48 49 50 4 46 51 20 7 49 34 21 14 0 0 49 40 9 5 30 0 32 291 -10 50 2 14 49 18 15 50 33 28 48 47 52 15 0 0 48 52 56 5 29 52 31 292 -9 49 14 59 48 31 4 49 46 10 48 0 45 16 0 0 48 5 7 5 29 44 30 293 -8 48 27 7 47 43 18 48 58 13 47 13 2 17 0 0 47 16 42 5 29 36 29 294 -7 47 38 38 46 54 56 48 9 40 46 24 45 18 0 0 46 27 44 5 29 28 28 295 -6 46 49 37 46 6 2 47 20 33 45 35 57 19 0 0 45 38 16 5 29 21 27 296 -5 46 0 4 45 16 38 46 30 54 44 46 38 20 0 0 44 48 20 5 29 13 26 297 -4 45 10 3 44 26 47 45 40 46 43 56 53 21 0 0 43 57 58 5 29 6 25 298 -3 44 19 36 43 36 30 44 50 11 43 6 43 22 0 0 43 7 13 5 28 58 24 298 -2 43 28 45 42 45 50 43 59 12 42 16 10 23 0 0 42 16 7 5 28 51 23 299 -1 42 37 33 41 54 50 43 7 52 41 25 18 24 0 0 41 24 43 5 28 45 22 300 0 41 46 3 41 3 32 42 16 13 40 34 9 Uncertainty in time = +/- 4 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 2402-00481-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 20 29.0828 DE: +36 51 20.228 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .018 ) * V mag [mag]: 10.2 * B mag [mag]: 10.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (829) Academia approx. diameter [km]: 41 approx. diameter ["]: .040 distance from Earth [AU]: 1.43000 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1085 number of rejected observations: 42 time covered by the observations: 1914 Feb 28 - 2012 Nov 08 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.021, 87° remarks: * orbital elements for (829) Academia : Mean anomaly = 33.17794971 deg Arg. of pericenter = 41.87347080 deg Long. of node = 352.56132400 deg Inclination = 8.28152472 deg Eccentricity = 0.10043916 Semimajor axis = 2.58101177 AU Perihelion dist = 2.32177711 AU Mag: H = 10.95, G = 0.15 Epoch of elements : MJD 56257.23400000 TDT (2012 Nov 26.234) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 26 829 Academia 5h 36.5m UT 10.2 5 20 29.083 36 51 20.23TYC 2402-00481-1 10.3 14.0 41 4.4 1.430 -2.659 3.94 -69.5733 36.856 92.71 -21.01 5.6091 0.07639 0.62078 -5.18686 0.64149 -0.00163 -0.00141 2000 31.45846820121119.00000 41.873471352.561324 8.2815250.10043916 2.5810118 2.321777110.7 5.00.15 RATE 2.3769450 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.028 88 1.70 0.028 0 0-2-2 056247.0020121126_0481-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org