IOTA/IOTA-ES occultation update for (132) Aethra / TYC 6846-01243-1 event on 2008 May 12, 11:17 UT Visible from New Zealand, Australia Summary ------- On 2008 May 12 UT, the 43 km diameter asteroid (132) Aethra will occult a 12.4 mag star in the constellation Sagittarius for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 13.1 mag (the magnitude of the asteroid) for at most 3.8 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: 64 * date and approx. time of event: 2008 May 12, 11:12 - 2008 May 12, 11:23 UT * magnitude of target star: 12.4 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 3.8 * Moon: 54 % sunlit, 124° distance * Sun: 141° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 68 * 1 sigma uncertainty interval [path widths]: +/- 0.96 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .032", 70° ) * approx speed of asteroid's shadow [km/s]: 11.3282 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6846-01243-1 by 132 Aethra on 2008 May 12 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 54 9 31 -68 57 28 11 12 10 5 178 -2 54 18 1 -66 37 35 53 55 26 -70 29 20 ... .. .. .. .. .. 53 19 14 -72 41 39 57 4 11 -73 29 38 11 12 19 9 176 -6 57 13 19 -72 30 49 56 52 27 -74 22 55 57 22 19 -70 12 47 56 22 55 -75 54 8 61 0 34 -76 21 34 11 12 28 12 172 -9 61 3 54 -75 36 58 60 55 19 -77 3 42 61 4 49 -74 2 26 60 39 43 -78 18 56 66 14 4 -78 32 15 11 12 37 15 167 -11 66 6 23 -77 54 27 66 20 49 -79 8 33 65 48 51 -76 36 56 66 31 6 -80 14 40 73 4 0 -80 14 58 11 12 46 17 160 -13 72 38 6 -79 41 33 73 30 45 -80 47 20 71 49 57 -78 34 4 74 25 14 -81 46 54 81 48 18 -81 33 38 11 12 55 18 152 -15 80 55 5 -81 3 47 82 45 17 -82 2 39 79 21 30 -80 3 53 84 47 46 -82 56 8 92 30 42 -82 28 31 11 13 4 20 142 -17 91 1 48 -82 2 15 94 7 5 -82 53 57 88 28 33 -81 9 26 97 37 23 -83 40 27 104 42 12 -82 58 46 11 13 13 21 130 -19 102 35 37 -82 36 35 106 58 54 -83 20 1 98 57 13 -81 51 21 111 53 48 -83 57 59 117 15 18 -83 4 46 11 13 22 23 118 -20 114 40 5 -82 47 4 120 0 17 -83 21 22 110 7 33 -82 10 7 125 45 49 -83 49 57 128 51 48 -82 49 24 11 13 31 24 106 -22 126 4 24 -82 36 10 131 46 5 -83 1 28 121 2 44 -82 7 35 137 38 55 -83 21 16 138 42 8 -82 17 27 11 13 40 25 97 -23 135 57 27 -82 8 9 141 30 26 -82 25 38 130 52 56 -81 47 12 147 1 42 -82 38 12 146 35 56 -81 33 55 11 13 49 26 90 -24 144 2 29 -81 27 48 149 10 36 -81 39 1 139 12 52 -81 13 14 154 9 10 -81 46 5 152 46 32 -80 42 48 11 13 58 27 84 -25 150 27 16 -80 39 8 155 5 36 -80 45 36 146 0 37 -80 29 36 159 30 48 -80 48 38 157 34 18 -79 46 59 11 14 7 28 79 -27 155 29 7 -79 45 9 159 38 36 -79 48 4 151 27 8 -79 39 30 163 33 55 -79 48 9 161 18 18 -78 48 19 11 14 16 29 76 -28 159 25 48 -78 47 52 163 9 36 -78 48 9 155 47 4 -78 45 9 166 39 26 -78 46 6 164 13 45 -77 48 3 11 14 25 30 74 -29 162 32 15 -77 48 37 165 53 58 -77 46 56 159 14 11 -77 48 7 169 2 29 -77 43 19 166 32 10 -76 46 56 11 14 34 31 72 -30 165 0 2 -76 48 17 168 3 2 -76 45 7 161 59 54 -76 49 28 170 53 46 -76 40 20 168 22 3 -75 45 29 11 14 43 31 71 -31 166 57 54 -75 47 24 169 45 2 -75 43 8 164 13 9 -75 49 53 172 20 52 -75 37 30 169 49 43 -74 44 0 11 14 52 32 70 -32 168 32 20 -74 46 22 171 6 0 -74 41 15 166 0 46 -74 49 51 173 29 17 -74 35 0 170 59 49 -73 42 43 11 15 1 33 69 -34 169 48 14 -73 45 25 172 10 24 -73 39 40 167 27 59 -73 49 39 174 23 1 -73 32 57 171 55 52 -72 41 45 11 15 10 33 69 -35 170 49 15 -72 44 42 173 1 33 -72 38 29 168 38 47 -72 49 32 175 5 1 -72 31 25 172 40 32 -71 41 10 11 15 19 34 69 -36 171 38 14 -71 44 19 173 41 59 -71 37 44 169 36 14 -71 49 36 175 37 33 -71 30 25 173 15 51 -70 41 2 11 15 28 35 69 -37 172 17 18 -70 44 20 174 13 36 -70 37 29 170 22 43 -70 49 57 176 2 19 -70 30 0 173 43 25 -69 41 21 11 15 37 35 69 -38 172 48 10 -69 44 46 174 37 57 -69 37 43 171 0 5 -69 50 38 176 20 38 -69 30 7 174 4 30 -68 42 9 11 15 46 36 69 -39 173 12 10 -68 45 38 174 56 11 -68 38 27 171 29 48 -68 51 42 176 33 33 -68 30 47 174 20 6 -67 43 25 11 15 55 36 69 -40 173 30 20 -67 46 57 175 9 15 -67 39 41 171 53 4 -67 53 9 176 41 54 -67 31 59 174 31 0 -66 45 8 11 16 4 36 70 -40 173 43 33 -66 48 42 175 17 54 -66 41 23 172 10 48 -66 55 0 176 46 21 -66 33 41 174 37 53 -65 47 18 11 16 13 37 70 -41 173 52 28 -65 50 53 175 22 45 -65 43 33 172 23 48 -65 57 14 176 47 26 -65 35 52 174 41 14 -64 49 53 11 16 22 37 71 -42 173 57 42 -64 53 28 175 24 18 -64 46 9 172 32 41 -64 59 51 176 45 35 -64 38 31 174 41 32 -63 52 53 11 16 31 38 72 -43 173 59 40 -63 56 27 175 22 57 -63 49 9 172 37 58 -64 2 50 176 41 9 -63 41 35 174 39 8 -62 56 15 11 16 40 38 72 -44 173 58 47 -62 59 48 175 19 3 -62 52 33 172 40 4 -63 6 10 176 34 28 -62 45 3 174 34 19 -61 59 59 11 16 49 38 73 -45 173 55 21 -62 3 30 175 12 52 -61 56 19 172 39 22 -62 9 50 176 25 46 -61 48 54 174 27 21 -61 4 2 11 16 58 38 74 -46 173 49 39 -61 7 31 175 4 40 -61 0 25 172 36 9 -61 13 48 176 15 14 -60 53 6 174 18 27 -60 8 25 11 17 7 39 75 -47 173 41 54 -60 11 51 174 54 38 -60 4 50 172 30 41 -60 18 4 176 3 5 -59 57 37 174 7 48 -59 13 4 11 17 16 39 75 -48 173 32 19 -59 16 28 174 42 56 -59 9 33 172 23 10 -59 22 36 175 49 26 -59 2 26 173 55 32 -58 18 0 11 17 25 39 76 -48 173 21 2 -58 21 20 174 29 43 -58 14 32 172 13 48 -58 27 24 175 34 26 -58 7 32 173 41 48 -57 23 9 11 17 34 39 77 -49 173 8 11 -57 26 27 174 15 6 -57 19 45 172 2 44 -57 32 24 175 18 9 -57 12 52 173 26 42 -56 28 32 11 17 43 39 78 -50 172 53 55 -56 31 46 173 59 11 -56 25 11 171 50 5 -56 37 37 175 0 43 -56 18 26 173 10 20 -55 34 6 11 17 52 39 79 -51 172 38 18 -55 37 16 173 42 4 -55 30 49 171 35 58 -55 43 1 174 42 11 -55 24 12 172 52 46 -54 39 51 11 18 1 39 80 -51 172 21 27 -54 42 57 173 23 48 -54 36 38 171 20 30 -54 48 34 174 22 36 -54 30 9 172 34 4 -53 45 44 11 18 10 39 81 -52 172 3 24 -53 48 46 173 4 28 -53 42 35 171 3 44 -53 54 16 174 2 4 -53 36 15 172 14 18 -52 51 44 11 18 19 39 82 -53 171 44 14 -52 54 42 172 44 6 -52 48 40 170 45 46 -53 0 4 173 40 34 -52 42 28 171 53 30 -51 57 51 11 18 28 39 83 -54 171 24 0 -52 0 44 172 22 45 -51 54 51 170 26 37 -52 5 58 173 18 11 -51 48 48 171 31 43 -51 4 2 11 18 37 39 84 -54 171 2 44 -51 6 50 172 0 27 -51 1 7 170 6 22 -51 11 56 172 54 56 -50 55 13 171 8 59 -50 10 16 11 18 46 39 85 -55 170 40 28 -50 13 0 171 37 14 -50 7 26 169 45 2 -50 17 56 172 30 50 -50 1 42 170 45 18 -49 16 32 11 18 55 39 86 -56 170 17 14 -49 19 10 171 13 7 -49 13 46 169 22 40 -49 23 58 172 5 53 -49 8 12 170 20 42 -48 22 48 11 19 4 38 87 -56 169 53 2 -48 25 21 170 48 7 -48 20 8 168 59 16 -48 29 59 171 40 7 -48 14 44 169 55 11 -47 29 2 11 19 13 38 88 -57 169 27 54 -47 31 31 170 22 14 -47 26 28 168 34 51 -47 35 58 171 13 32 -47 21 14 169 28 46 -46 35 14 11 19 22 38 89 -57 169 1 49 -46 37 37 169 55 28 -46 32 45 168 9 27 -46 41 54 170 46 8 -46 27 43 169 1 26 -45 41 22 11 19 31 38 90 -58 168 34 48 -45 43 39 169 27 50 -45 38 59 167 43 2 -45 47 45 170 17 55 -45 34 7 168 33 12 -44 47 24 11 19 40 37 91 -58 168 6 51 -44 49 35 168 59 19 -44 45 6 167 15 38 -44 53 28 169 48 52 -44 40 26 168 4 2 -43 53 17 11 19 49 37 92 -59 167 37 57 -43 55 22 168 29 54 -43 51 6 166 47 13 -43 59 4 169 18 58 -43 46 38 167 33 56 -42 59 1 11 19 58 37 93 -59 167 8 4 -43 1 0 167 59 34 -42 56 57 166 17 47 -43 4 29 168 48 12 -42 52 41 167 2 51 -42 4 34 11 20 7 36 94 -60 166 37 12 -42 6 26 167 28 18 -42 2 36 165 47 18 -42 9 41 168 16 33 -41 58 34 166 30 48 -41 9 53 11 20 16 36 95 -60 166 5 18 -41 11 38 166 56 4 -41 8 3 165 15 44 -41 14 39 167 43 59 -41 4 13 165 57 42 -40 14 57 11 20 25 35 96 -60 165 32 21 -40 16 33 166 22 49 -40 13 14 164 43 3 -40 19 20 167 10 28 -40 9 39 165 23 32 -39 19 43 11 20 34 35 97 -61 164 58 18 -39 21 11 165 48 32 -39 18 7 164 9 13 -39 23 42 166 35 57 -39 14 47 164 48 15 -38 24 8 11 20 43 34 98 -61 164 23 6 -38 25 28 165 13 10 -38 22 41 163 34 11 -38 27 42 166 0 24 -38 19 36 164 11 47 -37 28 10 11 20 52 34 99 -61 163 46 41 -37 29 21 164 36 38 -37 26 52 162 57 52 -37 31 18 165 23 45 -37 24 4 163 34 3 -36 31 46 11 21 1 33 100 -61 163 9 0 -36 32 47 163 58 53 -36 30 37 162 20 12 -36 34 25 164 45 56 -36 28 7 162 55 1 -35 34 52 11 21 10 32 101 -61 162 29 56 -35 35 43 163 19 51 -35 33 54 161 41 7 -35 37 1 164 6 53 -35 31 42 162 14 33 -34 37 26 11 21 19 32 101 -61 161 49 25 -34 38 6 162 39 25 -34 36 38 161 0 29 -34 39 1 163 26 31 -34 34 47 161 32 33 -33 39 22 11 21 28 31 102 -61 161 7 20 -33 39 50 161 57 30 -33 38 46 160 18 13 -33 40 21 162 44 43 -33 37 17 160 48 53 -32 40 37 11 21 37 30 103 -61 160 23 33 -32 40 52 161 13 57 -32 40 14 159 34 8 -32 40 57 162 1 23 -32 39 7 160 3 25 -31 41 4 11 21 46 29 104 -61 159 37 54 -31 41 5 160 28 40 -31 40 55 158 48 6 -31 40 41 161 16 23 -31 40 14 159 15 58 -30 40 38 11 21 55 29 105 -61 158 50 13 -30 40 23 159 41 26 -30 40 45 157 59 55 -30 39 27 160 29 33 -30 40 32 158 26 19 -29 39 12 11 22 4 28 106 -60 158 0 15 -29 38 39 158 52 4 -29 39 35 157 9 18 -29 37 8 159 40 42 -29 39 54 157 34 12 -28 36 37 11 22 13 27 106 -60 157 7 45 -28 35 45 158 0 20 -28 37 20 156 16 0 -28 33 33 158 49 35 -28 38 13 156 39 19 -27 32 43 11 22 22 26 107 -59 156 12 23 -27 31 28 157 5 54 -27 33 47 155 19 37 -27 28 30 157 55 58 -27 35 20 155 41 16 -26 27 17 11 22 31 24 108 -59 155 13 44 -26 25 36 156 8 25 -26 28 46 154 19 42 -26 21 45 156 59 28 -26 31 3 154 39 33 -25 20 3 11 22 40 23 109 -58 154 11 16 -25 17 52 155 7 24 -25 22 1 153 15 37 -25 12 58 155 59 42 -25 25 10 153 33 30 -24 10 41 11 22 49 22 110 -57 153 4 15 -24 7 54 154 2 14 -24 13 13 152 6 36 -24 1 45 154 56 5 -24 17 23 152 22 15 -22 58 45 11 22 58 21 110 -56 151 51 47 -22 55 13 152 52 7 -23 1 58 150 51 29 -22 47 31 153 47 57 -23 7 21 151 4 35 -21 43 35 11 23 7 19 111 -55 150 32 30 -21 39 8 151 35 56 -21 47 40 149 28 42 -21 29 27 152 34 19 -21 54 33 149 38 42 -20 24 19 11 23 16 17 112 -54 149 4 25 -20 18 39 150 12 4 -20 29 31 147 55 43 -20 6 17 151 13 50 -20 38 20 148 1 47 -18 59 30 11 23 25 15 113 -52 147 24 19 -18 52 8 148 38 0 -19 6 15 146 8 19 -18 35 54 149 44 30 -19 17 38 146 8 54 -17 26 42 11 23 34 13 113 -50 145 26 23 -17 16 42 146 49 31 -17 35 45 143 58 8 -16 54 9 148 3 3 -17 50 52 143 49 48 -15 40 49 11 23 43 11 114 -48 142 57 40 -15 25 55 144 38 17 -15 53 53 141 2 53 -14 49 59 146 3 36 -16 15 4 140 33 43 -13 26 37 11 23 52 7 115 -44 139 11 21 -12 56 40 141 42 23 -13 49 47 ... .. .. .. .. .. 143 33 7 -14 23 47 Uncertainty in time = +/- 4 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 6846-01243-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 03 34.1085 DE: -25 53 35.058 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .030 ) * V mag [mag]: 12.4 * B mag [mag]: 12.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (132) Aethra approx. diameter [km]: 43 approx. diameter ["]: .039 distance from Earth [AU]: 1.53800 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 869 number of rejected observations: 52 time covered by the observations: 1932 Jun 21 - 2008 Apr 18 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.010, 61° remarks: * orbital elements for (132) Aethra : Mean anomaly = 56.80260117 deg Arg. of pericenter = 254.40639534 deg Long. of node = 258.91555754 deg Inclination = 25.05039511 deg Eccentricity = 0.38799682 Semimajor axis = 2.60973237 AU Perihelion dist = 1.59716450 AU Mag: H = 8.91, G = 0.15 Epoch of elements : MJD 54598.47100000 TDT (2008 May 12.471) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 12 132 Aethra 11h 18.0m UT 12.4 18 3 34.109-25 53 35.06TYC 6846-01243-1 12.1 13.1 43 3.8 1.538 -2.091 23.28 -129.2135 -25.900 9.59 18.30 11.3003 -0.49182 -0.59661 -4.93009 4.07145 -0.00340 0.00016 2000 54.8222382008 5 4.00000254.406395258.915558 25.0503950.38799682 2.6097324 1.5971645 9.4 5.00.15 RATE 2.3378150 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.032 70 1.96 0.037 0 54594.5020080512_1243-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org