IOTA/IOTA-ES occultation update for (829) Academia / TYC 2400-01927-1 event on 2012 Dec 10, 00:29 UT Visible from Arabia, Caribbean Summary ------- On 2012 Dec 10 UT, the 41 km diameter asteroid (829) Academia will occult a 12.1 mag star in the constellation Auriga for observers along a path across Arabia, Caribbean. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.8 mag (the magnitude of the asteroid) for at most 4.0 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: 63 * date and approx. time of event: 2012 Dec 10, 00:19 - 2012 Dec 10, 00:40 UT * geocentric midpoint of event [JD]: 2456271.52065 * magnitude of target star: 12.1 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 4.0 * Moon: 16 % sunlit, 131° distance * Sun: 166° distance * rough path description: Arabia, Caribbean The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 0.96 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .038", 88° ) * approx speed of asteroid's shadow [km/s]: 10.2775 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2400-01927-1 by 829 Academia on 2012 Dec 10 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 - 98 0 0 - 4 52 39 0 40 4 1 53 -2 - 4 38 41 - 5 6 37 - 4 11 53 - 5 33 28 - 97 0 0 - 4 7 4 0 40 4 2 53 -3 - 3 53 6 - 4 21 3 - 3 26 17 - 4 47 53 - 96 0 0 - 3 21 27 0 40 3 3 53 -4 - 3 7 28 - 3 35 25 - 2 40 40 - 4 2 15 - 95 0 0 - 2 35 47 0 40 2 5 53 -5 - 2 21 49 - 2 49 46 - 1 55 1 - 3 16 36 - 94 0 0 - 1 50 9 0 40 1 6 53 -6 - 1 36 11 - 2 4 7 - 1 9 23 - 2 30 56 - 93 0 0 - 1 4 33 0 40 0 7 53 -8 - 0 50 35 - 1 18 30 - 0 23 49 - 1 45 19 - 92 0 0 - 0 19 0 0 39 58 8 53 -9 - 0 5 4 - 0 32 57 0 21 42 - 0 59 45 - 91 0 0 0 26 26 0 39 56 10 53 -10 0 40 22 0 12 30 1 7 6 - 0 14 16 - 90 0 0 1 11 45 0 39 53 11 53 -11 1 25 40 0 57 50 1 52 22 0 31 5 - 89 0 0 1 56 54 0 39 51 12 53 -13 2 10 48 1 43 0 2 37 29 1 16 18 - 88 0 0 2 41 53 0 39 48 13 53 -14 2 55 46 2 28 0 3 22 24 2 1 20 - 87 0 0 3 26 40 0 39 44 15 53 -15 3 40 31 3 12 48 4 7 7 2 46 10 - 86 0 0 4 11 12 0 39 41 16 53 -16 4 25 2 3 57 21 4 51 35 3 30 46 - 85 0 0 4 55 29 0 39 37 17 53 -17 5 9 17 4 41 40 5 35 48 4 15 8 - 84 0 0 5 39 28 0 39 33 18 53 -18 5 53 15 5 25 41 6 19 43 4 59 12 - 83 0 0 6 23 9 0 39 29 19 53 -20 6 36 55 6 9 24 7 3 19 5 42 58 - 82 0 0 7 6 31 0 39 24 21 53 -21 7 20 14 6 52 47 7 46 35 6 26 25 - 81 0 0 7 49 31 0 39 20 22 53 -22 8 3 12 7 35 49 8 29 29 7 9 31 - 80 0 0 8 32 9 0 39 15 23 53 -23 8 45 48 8 18 29 9 12 1 7 52 15 - 79 0 0 9 14 23 0 39 9 24 54 -24 9 28 0 9 0 45 9 54 9 8 34 35 - 78 0 0 9 56 12 0 39 4 25 54 -25 10 9 47 9 42 37 10 35 52 9 16 31 - 77 0 0 10 37 36 0 38 58 27 54 -27 10 51 8 10 24 3 11 17 9 9 58 1 - 76 0 0 11 18 32 0 38 53 28 54 -28 11 32 3 11 5 2 11 57 58 10 39 5 - 75 0 0 11 59 1 0 38 47 29 54 -29 12 12 29 11 45 33 12 38 20 11 19 40 - 74 0 0 12 39 1 0 38 40 30 54 -30 12 52 26 12 25 35 13 18 12 11 59 48 - 73 0 0 13 18 31 0 38 34 31 55 -31 13 31 54 13 5 8 13 57 35 12 39 25 - 72 0 0 13 57 31 0 38 27 32 55 -32 14 10 51 13 44 10 14 36 27 13 18 33 - 71 0 0 14 35 59 0 38 21 34 55 -33 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21 19 9 20 4 10 59 0 0 20 8 47 0 20 47 30 302 -29 20 21 40 19 55 54 20 46 25 19 31 8 60 0 0 19 35 17 0 20 41 29 302 -28 19 48 13 19 22 21 20 13 3 18 57 29 61 0 0 19 1 10 0 20 36 28 302 -27 19 14 9 18 48 11 19 39 5 18 23 14 62 0 0 18 26 27 0 20 30 27 303 -26 18 39 29 18 13 25 19 4 31 17 48 22 63 0 0 17 51 8 0 20 25 26 303 -25 18 4 13 17 38 2 18 29 20 17 12 54 64 0 0 17 15 13 0 20 20 25 303 -24 17 28 21 17 2 4 17 53 34 16 36 50 65 0 0 16 38 42 0 20 15 23 304 -23 16 51 54 16 25 31 17 17 12 16 0 11 66 0 0 16 1 37 0 20 10 22 304 -22 16 14 51 15 48 23 16 40 15 15 22 58 67 0 0 15 23 58 0 20 6 21 304 -21 15 37 15 15 10 41 16 2 44 14 45 10 68 0 0 14 45 44 0 20 1 20 304 -19 14 59 4 14 32 24 15 24 39 14 6 48 69 0 0 14 6 58 0 19 57 19 305 -18 14 20 20 13 53 35 14 46 1 13 27 53 70 0 0 13 27 39 0 19 53 18 305 -17 13 41 4 13 14 13 14 6 50 12 48 26 71 0 0 12 47 48 0 19 50 17 305 -16 13 1 16 12 34 20 13 27 7 12 8 27 72 0 0 12 7 26 0 19 46 15 305 -15 12 20 57 11 53 55 12 46 53 11 27 58 73 0 0 11 26 34 0 19 43 14 306 -14 11 40 8 11 13 1 12 6 8 10 46 59 74 0 0 10 45 13 0 19 40 13 306 -13 10 58 49 10 31 37 11 24 55 10 5 30 75 0 0 10 3 24 0 19 37 12 306 -11 10 17 2 9 49 46 10 43 13 9 23 34 76 0 0 9 21 8 0 19 34 11 306 -10 9 34 48 9 7 27 10 1 3 8 41 11 77 0 0 8 38 26 0 19 32 9 306 -9 8 52 8 8 24 43 9 18 27 7 58 22 78 0 0 7 55 19 0 19 30 8 306 -8 8 9 3 7 41 34 8 35 27 7 15 9 79 0 0 7 11 48 0 19 28 7 306 -7 7 25 35 6 58 1 7 52 2 6 31 32 80 0 0 6 27 55 0 19 27 6 307 -6 6 41 44 6 14 6 7 8 15 5 47 34 81 0 0 5 43 42 0 19 26 5 307 -4 5 57 32 5 29 51 6 24 7 5 3 15 82 0 0 4 59 9 0 19 25 3 307 -3 5 13 1 4 45 16 5 39 39 4 18 36 83 0 0 4 14 18 0 19 24 2 307 -2 4 28 12 4 0 23 4 54 52 3 33 41 84 0 0 3 29 10 0 19 24 1 307 -1 3 43 6 3 15 15 4 9 49 2 48 29 Uncertainty in time = +/- 5 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 2400-01927-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 04 31.9114 DE: +36 53 26.157 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .041, .032 ) * V mag [mag]: 12.1 * B mag [mag]: 13.4 * 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]: 1.41500 * 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): 0.033, 0.021, 84° remarks: * orbital elements for (829) Academia : Mean anomaly = 36.47116698 deg Arg. of pericenter = 41.85802055 deg Long. of node = 352.55713792 deg Inclination = 8.28146128 deg Eccentricity = 0.10044489 Semimajor axis = 2.58096961 AU Perihelion dist = 2.32172441 AU Mag: H = 10.95, G = 0.15 Epoch of elements : MJD 56271.02000000 TDT (2012 Dec 10.020) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 10 829 Academia 0h 29.7m UT 12.1 5 4 31.911 36 53 26.16TYC 2400-01927-1 13.4 13.8 41 4.0 1.415 -2.991 -3.31 -10.4483 36.891 170.76 -22.93 0.4956 0.00238 -0.02616 -5.77656 -0.53107 0.00007 -0.00140 2000 36.228713201212 9.00000 41.858021352.557138 8.2814610.10044489 2.5809696 2.321724410.7 5.00.15 RATE 2.3770030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.038 88 1.96 0.038 0 0 4-3 056264.0020121210_1927-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 09:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org