IOTA/IOTA-ES occultation update for (94) Aurora / 2UCAC 36825470 event on 2009 Nov 25, 10:05 UT Visible from USA Summary ------- On 2009 Nov 25 UT, the 218 km diameter asteroid (94) Aurora will occult a 12.8 mag star in the constellation Leo for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.0 mag to 13.3 mag (the magnitude of the asteroid) for at most 12.5 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: 99 * date and approx. time of event: 2009 Nov 25, 09:59 - 2009 Nov 25, 10:05 UT * magnitude of target star: 12.8 * magnitude drop [mag]: 1.0 * estimated maximum duration [s]: 12.5 * Moon: 54 % sunlit, 171° distance * Sun: 86° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 224 * 1 sigma uncertainty interval [path widths]: +/- 0.29 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .029", 95° ) * approx speed of asteroid's shadow [km/s]: 17.4244 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 36825470 by 94 Aurora on 2009 Nov 25 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 -152 0 0 32 17 25 9 59 45 0 73 -78 31 14 5 33 21 3 .. .. .. 33 58 5 -151 0 0 32 32 33 9 59 45 1 74 -78 31 29 20 33 36 5 30 52 47 34 13 4 -150 0 0 32 47 21 9 59 45 2 74 -78 31 44 14 33 50 46 31 7 45 34 27 41 -149 0 0 33 1 48 9 59 45 3 75 -77 31 58 47 34 5 6 31 22 21 34 41 57 -148 0 0 33 15 53 9 59 46 4 76 -77 32 12 59 34 19 5 31 36 37 34 55 53 -147 0 0 33 29 38 9 59 46 5 76 -76 32 26 49 34 32 43 31 50 31 35 9 27 -146 0 0 33 43 1 9 59 47 6 77 -76 32 40 19 34 46 0 32 4 4 35 22 40 -145 0 0 33 56 3 9 59 47 6 77 -75 32 53 27 34 58 56 32 17 15 35 35 32 -144 0 0 34 8 43 9 59 48 7 78 -74 33 6 13 35 11 30 32 30 5 35 48 3 -143 0 0 34 21 3 9 59 49 8 78 -74 33 18 38 35 23 43 32 42 34 36 0 13 -142 0 0 34 33 0 9 59 49 9 79 -73 33 30 42 35 35 35 32 54 41 36 12 1 -141 0 0 34 44 37 9 59 50 10 79 -72 33 42 24 35 47 6 33 6 26 36 23 29 -140 0 0 34 55 52 9 59 51 11 80 -72 33 53 45 35 58 15 33 17 50 36 34 34 -139 0 0 35 6 45 9 59 52 12 81 -71 34 4 44 36 9 3 33 28 53 36 45 19 -138 0 0 35 17 17 9 59 54 12 81 -70 34 15 21 36 19 30 33 39 33 36 55 43 -137 0 0 35 27 28 9 59 55 13 82 -70 34 25 37 36 29 35 33 49 52 37 5 45 -136 0 0 35 37 17 9 59 56 14 82 -69 34 35 31 36 39 19 33 59 49 37 15 25 -135 0 0 35 46 45 9 59 57 15 83 -68 34 45 4 36 48 41 34 9 25 37 24 45 -134 0 0 35 55 51 9 59 59 16 84 -67 34 54 15 36 57 43 34 18 38 37 33 43 -133 0 0 36 4 35 10 0 0 17 84 -67 35 3 4 37 6 22 34 27 30 37 42 20 -132 0 0 36 12 58 10 0 2 17 85 -66 35 11 32 37 14 41 34 36 0 37 50 36 -131 0 0 36 21 0 10 0 4 18 85 -65 35 19 38 37 22 38 34 44 9 37 58 31 -130 0 0 36 28 40 10 0 5 19 86 -64 35 27 22 37 30 14 34 51 56 38 6 4 -129 0 0 36 35 59 10 0 7 20 87 -64 35 34 45 37 37 28 34 59 21 38 13 16 -128 0 0 36 42 56 10 0 9 21 87 -63 35 41 46 37 44 21 35 6 24 38 20 7 -127 0 0 36 49 32 10 0 11 21 88 -62 35 48 25 37 50 53 35 13 6 38 26 36 -126 0 0 36 55 46 10 0 13 22 89 -61 35 54 43 37 57 4 35 19 25 38 32 45 -125 0 0 37 1 38 10 0 15 23 89 -61 36 0 39 38 2 53 35 25 23 38 38 32 -124 0 0 37 7 10 10 0 17 24 90 -60 36 6 14 38 8 21 35 31 0 38 43 58 -123 0 0 37 12 20 10 0 19 25 90 -59 36 11 26 38 13 28 35 36 14 38 49 3 -122 0 0 37 17 8 10 0 22 26 91 -58 36 16 18 38 18 13 35 41 7 38 53 47 -121 0 0 37 21 35 10 0 24 26 92 -57 36 20 47 38 22 38 35 45 38 38 58 10 -120 0 0 37 25 40 10 0 26 27 92 -57 36 24 55 38 26 41 35 49 47 39 2 11 -119 0 0 37 29 24 10 0 29 28 93 -56 36 28 42 38 30 23 35 53 35 39 5 52 -118 0 0 37 32 47 10 0 31 29 94 -55 36 32 6 38 33 43 35 57 1 39 9 11 -117 0 0 37 35 48 10 0 34 30 94 -54 36 35 9 38 36 43 36 0 5 39 12 9 -116 0 0 37 38 28 10 0 37 30 95 -54 36 37 51 38 39 21 36 2 48 39 14 47 -115 0 0 37 40 47 10 0 39 31 96 -53 36 40 11 38 41 38 36 5 8 39 17 3 -114 0 0 37 42 44 10 0 42 32 97 -52 36 42 9 38 43 33 36 7 7 39 18 58 -113 0 0 37 44 19 10 0 45 33 97 -51 36 43 45 38 45 8 36 8 44 39 20 32 -112 0 0 37 45 33 10 0 48 33 98 -50 36 45 0 38 46 21 36 10 0 39 21 44 -111 0 0 37 46 26 10 0 51 34 99 -50 36 45 54 38 47 13 36 10 53 39 22 36 -110 0 0 37 46 57 10 0 54 35 99 -49 36 46 25 38 47 44 36 11 25 39 23 6 -109 0 0 37 47 7 10 0 57 36 100 -48 36 46 35 38 47 53 36 11 35 39 23 16 -108 0 0 37 46 55 10 1 0 37 101 -47 36 46 23 38 47 41 36 11 23 39 23 4 -107 0 0 37 46 22 10 1 3 37 101 -47 36 45 50 38 47 8 36 10 50 39 22 31 -106 0 0 37 45 27 10 1 6 38 102 -46 36 44 54 38 46 14 36 9 54 39 21 37 -105 0 0 37 44 10 10 1 9 39 103 -45 36 43 37 38 44 58 36 8 37 39 20 21 -104 0 0 37 42 32 10 1 13 40 104 -44 36 41 59 38 43 21 36 6 57 39 18 45 -103 0 0 37 40 33 10 1 16 41 104 -43 36 39 58 38 41 23 36 4 56 39 16 47 -102 0 0 37 38 12 10 1 20 41 105 -43 36 37 36 38 39 3 36 2 33 39 14 28 -101 0 0 37 35 29 10 1 23 42 106 -42 36 34 51 38 36 22 35 59 48 39 11 47 -100 0 0 37 32 24 10 1 27 43 107 -41 36 31 45 38 33 19 35 56 41 39 8 46 - 99 0 0 37 28 58 10 1 30 44 108 -40 36 28 17 38 29 54 35 53 11 39 5 23 - 98 0 0 37 25 10 10 1 34 44 108 -39 36 24 27 38 26 9 35 49 20 39 1 38 - 97 0 0 37 21 0 10 1 38 45 109 -39 36 20 15 38 22 1 35 45 7 38 57 32 - 96 0 0 37 16 29 10 1 42 46 110 -38 36 15 41 38 17 32 35 40 31 38 53 4 - 95 0 0 37 11 35 10 1 46 47 111 -37 36 10 45 38 12 42 35 35 34 38 48 15 - 94 0 0 37 6 20 10 1 50 48 112 -36 36 5 26 38 7 29 35 30 14 38 43 5 - 93 0 0 37 0 43 10 1 54 48 113 -35 35 59 46 38 1 55 35 24 31 38 37 32 - 92 0 0 36 54 44 10 1 58 49 113 -35 35 53 43 37 55 59 35 18 27 38 31 39 - 91 0 0 36 48 22 10 2 2 50 114 -34 35 47 19 37 49 41 35 12 0 38 25 23 - 90 0 0 36 41 39 10 2 6 51 115 -33 35 40 32 37 43 2 35 5 11 38 18 46 - 89 0 0 36 34 34 10 2 10 52 116 -32 35 33 22 37 36 0 34 57 59 38 11 46 - 88 0 0 36 27 6 10 2 14 52 117 -31 35 25 51 37 28 37 34 50 25 38 4 25 - 87 0 0 36 19 16 10 2 19 53 118 -30 35 17 57 37 20 52 34 42 29 37 56 42 - 86 0 0 36 11 4 10 2 23 54 119 -30 35 9 40 37 12 44 34 34 10 37 48 38 - 85 0 0 36 2 30 10 2 28 55 120 -29 35 1 1 37 4 14 34 25 28 37 40 11 - 84 0 0 35 53 33 10 2 32 56 121 -28 34 52 0 36 55 23 34 16 24 37 31 22 - 83 0 0 35 44 14 10 2 37 56 122 -27 34 42 36 36 46 9 34 6 57 37 22 11 - 82 0 0 35 34 33 10 2 41 57 123 -26 34 32 49 36 36 33 33 57 8 37 12 38 - 81 0 0 35 24 29 10 2 46 58 124 -25 34 22 40 36 26 34 33 46 56 37 2 42 - 80 0 0 35 14 3 10 2 51 59 125 -25 34 12 9 36 16 14 33 36 21 36 52 25 - 79 0 0 35 3 14 10 2 56 59 126 -24 34 1 14 36 5 31 33 25 24 36 41 45 - 78 0 0 34 52 3 10 3 1 60 128 -23 33 49 57 35 54 25 33 14 3 36 30 43 - 77 0 0 34 40 30 10 3 6 61 129 -22 33 38 18 35 42 57 33 2 20 36 19 19 - 76 0 0 34 28 33 10 3 11 62 130 -21 33 26 15 35 31 7 32 50 14 36 7 32 - 75 0 0 34 16 14 10 3 16 63 131 -20 33 13 50 35 18 55 32 37 46 35 55 23 - 74 0 0 34 3 33 10 3 21 63 133 -19 33 1 3 35 6 19 32 24 55 35 42 52 - 73 0 0 33 50 29 10 3 26 64 134 -18 32 47 52 34 53 22 32 11 40 35 29 58 - 72 0 0 33 37 2 10 3 31 65 136 -18 32 34 19 34 40 2 31 58 4 35 16 42 - 71 0 0 33 23 13 10 3 36 66 137 -17 32 20 23 34 26 19 31 44 4 35 3 4 - 70 0 0 33 9 1 10 3 42 66 139 -16 32 6 5 34 12 15 31 29 42 34 49 3 - 69 0 0 32 54 27 10 3 47 67 141 -15 31 51 24 33 57 47 31 14 57 34 34 39 - 68 0 0 32 39 30 10 3 52 68 143 -14 31 36 20 33 42 57 30 59 49 34 19 54 - 67 0 0 32 24 11 10 3 58 68 144 -13 31 20 54 33 27 45 30 44 19 34 4 46 - 66 0 0 32 8 30 10 4 3 69 146 -12 31 5 5 33 12 11 30 28 26 33 49 15 - 65 0 0 31 52 26 10 4 9 70 149 -11 30 48 54 32 56 14 30 12 11 33 33 23 - 64 0 0 31 35 59 10 4 15 71 151 -10 30 32 21 32 39 55 29 55 34 33 17 8 - 63 0 0 31 19 11 10 4 20 71 153 -10 30 15 25 32 23 14 29 38 34 33 0 31 - 62 0 0 31 2 0 10 4 26 72 156 -9 29 58 7 32 6 10 29 21 12 32 43 32 - 61 0 0 30 44 28 10 4 32 72 159 -8 29 40 28 31 48 45 29 3 28 32 26 11 - 60 0 0 30 26 33 10 4 38 73 161 -7 29 22 26 31 30 58 28 45 22 32 8 28 - 59 0 0 30 8 17 10 4 44 74 164 -6 29 4 2 31 12 49 28 26 54 31 50 24 - 58 0 0 29 49 39 10 4 50 74 168 -5 28 45 17 30 54 18 28 8 5 31 31 57 - 57 0 0 29 30 39 10 4 56 75 171 -4 28 26 11 30 35 26 27 48 54 31 13 10 - 56 0 0 29 11 19 10 5 2 75 175 -3 28 6 43 30 16 13 27 29 22 30 54 1 - 55 0 0 28 51 37 10 5 8 75 179 -2 27 46 54 29 56 38 27 9 29 30 34 30 - 54 0 0 28 31 34 10 5 14 76 183 -1 27 26 44 29 36 43 26 49 15 30 14 39 - 53 0 0 28 11 11 10 5 20 76 187 0 27 6 13 29 16 27 26 28 41 29 54 27 Uncertainty in time = +/- 4 secs Prediction of 2009 Nov 15.0 Data for the target star ------------------------ * name: 2UCAC 36825470 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 43 52.4500 DE: +14 17 05.535 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .028 ) * V mag [mag]: 12.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (94) Aurora approx. diameter [km]: 218 approx. diameter ["]: .101 distance from Earth [AU]: 2.97300 * orbital information: orbit source: Preston date of fit: 2009 Aug 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 896 number of rejected observations: 97 time covered by the observations: 1901 Oct 14 - 2009 Apr 03 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.008, 120° remarks: * orbital elements for (94) Aurora : Mean anomaly = 65.77460461 deg Arg. of pericenter = 59.87234161 deg Long. of node = 2.69036237 deg Inclination = 7.96544240 deg Eccentricity = 0.08826245 Semimajor axis = 3.16099615 AU Perihelion dist = 2.88199887 AU Mag: H = 7.47, G = 0.15 Epoch of elements : MJD 55160.42100000 TDT (2009 Nov 25.421) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 25 94 Aurora 10h 5.7m UT 12.8 10 43 52.450 14 17 5.532UCAC 36825470 0.0 13.3 218 12.5 2.973 1.884 -9.77 -54.9354 14.288 25.34 -20.81 10.0945 0.07836 0.21984 9.26289 -3.30499 -0.00551 0.00229 2000 65.70077220091125.00000 59.872342 2.690362 7.9654420.08826245 3.1609962 2.8819989 7.6 5.00.15 RATE 1.7537520 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.029 95 1.29 0.029 0 055150.0020091125_825470 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Aug 07, 04:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org