IOTA/IOTA-ES occultation update for (679) Pax / TYC 1424-01029-1 event on 2012 Dec 05, 14:05 UT Visible from Alaska Summary ------- On 2012 Dec 05 UT, the 61 km diameter asteroid (679) Pax will occult a 12.1 mag star in the constellation Leo for observers along a path across Alaska. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 14.0 mag (the magnitude of the asteroid) for at most 4.9 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: 65 * date and approx. time of event: 2012 Dec 05, 14:00 - 2012 Dec 05, 14:12 UT * geocentric midpoint of event [JD]: 2456267.08782917 * magnitude of target star: 12.1 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 4.9 * Moon: 60 % sunlit, 14° distance * Sun: 102° distance * rough path description: Alaska The occultation path -------------------- * approximate projected width [km]: 84 * 1 sigma uncertainty interval [path widths]: +/- 0.92 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .033", 90° ) * approx speed of asteroid's shadow [km/s]: 12.3752 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1424-01029-1 by 679 Pax on 2012 Dec 5 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 147 21 9 9 29 42 14 0 19 7 71 -77 145 43 28 9 9 28 148 41 45 9 43 49 ... .. .. .. .. .. 150 45 46 10 1 1 151 24 30 11 36 4 14 0 28 12 72 -78 150 24 37 11 29 31 152 20 5 11 41 5 148 18 39 11 11 45 153 53 49 11 47 10 154 15 20 13 16 9 14 0 38 15 73 -79 153 26 52 13 13 50 155 1 34 13 17 40 151 50 33 13 6 57 156 21 44 13 18 39 156 33 53 14 44 23 14 0 47 18 74 -78 155 51 21 14 44 20 157 14 57 14 43 55 154 28 38 14 42 35 158 27 6 14 41 47 158 33 3 16 5 27 14 0 57 20 75 -78 157 54 14 16 6 51 159 10 46 16 3 38 156 39 37 16 8 16 160 17 34 15 59 22 160 18 58 17 21 34 14 1 6 22 75 -77 159 42 45 17 24 1 160 54 20 17 18 47 158 33 34 17 27 38 161 57 18 17 12 54 161 55 8 18 34 1 14 1 16 24 76 -76 161 20 48 18 37 17 162 28 45 18 30 29 160 15 33 18 42 33 163 28 48 18 23 20 163 23 46 19 43 37 14 1 25 25 77 -75 162 50 52 19 47 32 163 56 1 19 39 28 161 48 35 19 54 6 164 53 49 19 31 17 164 46 20 20 50 55 14 1 35 27 78 -74 164 14 35 20 55 23 165 17 31 20 46 16 163 14 36 21 3 1 166 13 32 20 37 12 166 3 56 21 56 20 14 1 44 28 79 -73 165 33 6 22 1 15 166 34 16 21 51 14 164 34 58 22 9 48 167 28 49 21 41 25 167 17 23 23 0 9 14 1 53 30 80 -71 166 47 18 23 5 28 167 47 1 22 54 40 165 50 38 23 14 48 168 40 23 22 44 11 168 27 18 24 2 38 14 2 3 31 81 -70 167 57 49 24 8 18 168 56 21 23 56 48 167 2 22 24 18 19 169 48 44 23 45 43 169 34 10 25 3 56 14 2 12 32 82 -69 169 5 11 25 9 55 170 2 45 24 57 48 168 10 44 25 20 34 170 54 19 24 46 11 170 38 23 26 4 14 14 2 22 33 83 -68 170 9 49 26 10 31 171 6 35 25 57 49 169 16 11 26 21 43 171 57 28 25 45 42 171 40 18 27 3 39 14 2 31 34 84 -67 171 12 3 27 10 12 172 8 9 26 56 58 170 19 6 27 21 55 172 58 30 26 44 24 172 40 9 28 2 17 14 2 41 35 85 -66 172 12 12 28 9 5 173 7 45 27 55 22 171 19 47 28 21 16 173 57 38 27 42 22 173 38 12 29 0 14 14 2 50 36 86 -65 173 10 28 29 7 16 174 5 35 28 53 6 172 18 30 29 19 55 174 55 6 28 39 41 174 34 38 29 57 36 14 3 0 37 87 -64 174 7 5 30 4 51 175 1 51 29 50 14 173 15 28 30 17 54 175 51 4 29 36 26 175 29 38 30 54 25 14 3 9 38 89 -63 175 2 13 31 1 53 175 56 43 30 46 51 174 10 52 31 15 20 176 45 43 30 32 41 176 23 20 31 50 46 14 3 19 39 90 -62 175 56 1 31 58 26 176 50 20 31 43 0 175 4 53 32 12 16 177 39 10 31 28 28 177 15 54 32 46 42 14 3 28 40 91 -61 176 48 39 32 54 33 177 42 50 32 38 44 175 57 38 33 8 46 178 31 33 32 23 52 178 7 26 33 42 16 14 3 38 40 92 -60 177 40 13 33 50 19 178 34 19 33 34 7 176 49 17 34 4 53 179 23 0 33 18 55 178 58 3 34 37 30 14 3 47 41 94 -59 178 30 50 34 45 44 179 24 56 34 29 11 177 39 56 35 0 39 -179 46 24 34 13 39 179 47 50 35 32 28 14 3 57 42 95 -58 179 20 37 35 40 53 -179 45 15 35 23 58 178 29 40 35 56 9 -178 56 33 35 8 7 -179 23 6 36 27 12 14 4 6 42 96 -57 -179 50 22 36 35 48 -178 56 9 36 18 31 179 18 37 36 51 23 -178 7 22 36 2 21 -178 34 40 37 21 43 14 4 16 43 98 -57 -179 2 0 37 30 30 -178 7 40 37 12 52 -179 53 9 37 46 25 -177 18 46 36 56 22 -177 46 49 38 16 4 14 4 25 43 99 -56 -178 14 14 38 25 1 -177 19 43 38 7 3 -179 5 33 38 41 16 -176 30 40 37 50 14 -176 59 26 39 10 17 14 4 35 44 101 -55 -177 26 58 39 19 24 -176 32 14 39 1 5 -178 18 30 39 35 59 -175 42 59 38 43 58 -176 12 29 40 4 23 14 4 44 44 102 -54 -176 40 9 40 13 41 -175 45 9 39 55 1 -177 31 55 40 30 35 -174 55 40 39 37 35 -175 25 52 40 58 25 14 4 54 45 104 -53 -175 53 41 41 7 53 -174 58 23 40 48 52 -176 45 46 41 25 7 -174 8 39 40 31 7 -174 39 33 41 52 23 14 5 3 45 105 -52 -175 7 32 42 2 2 -174 11 53 41 42 40 -175 59 57 42 19 36 -173 21 51 41 24 35 -173 53 26 42 46 20 14 5 13 45 107 -51 -174 21 37 42 56 10 -173 25 35 42 36 26 -175 14 24 43 14 3 -172 35 13 42 18 2 -173 7 28 43 40 17 14 5 22 46 108 -50 -173 35 53 43 50 17 -172 39 25 43 30 12 -174 29 5 44 8 31 -171 48 41 43 11 29 -172 21 36 44 34 15 14 5 32 46 110 -50 -172 50 15 44 44 27 -171 53 19 44 23 59 -173 43 54 45 3 1 -171 2 11 44 4 56 -171 35 46 45 28 17 14 5 41 46 112 -49 -172 4 40 45 38 39 -171 7 14 45 17 50 -172 58 49 45 57 34 -170 15 39 44 58 26 -170 49 53 46 22 23 14 5 51 46 113 -48 -171 19 4 46 32 57 -170 21 5 46 11 45 -172 13 46 46 52 13 -169 29 2 45 52 1 -170 3 54 47 16 35 14 6 0 46 115 -47 -170 33 23 47 27 21 -169 34 48 47 5 45 -171 28 40 47 46 59 -168 42 14 46 45 40 -169 17 44 48 10 55 14 6 9 47 117 -46 -169 47 33 48 21 52 -168 48 20 47 59 53 -170 43 29 48 41 52 -167 55 13 47 39 26 -168 31 20 49 5 23 14 6 19 47 118 -46 -169 1 30 49 16 33 -168 1 35 48 54 9 -169 58 7 49 36 56 -167 7 54 48 33 20 -167 44 37 50 0 2 14 6 28 47 120 -45 -168 15 10 50 11 25 -167 14 31 49 48 36 -169 12 30 50 32 12 -166 20 11 49 27 24 -166 57 31 50 54 54 14 6 38 47 122 -44 -167 28 27 51 6 29 -166 27 1 50 43 14 -168 26 35 51 27 40 -165 32 1 50 21 38 -166 9 56 51 49 58 14 6 47 47 124 -43 -166 41 18 52 1 48 -165 39 1 51 38 5 -167 40 16 52 23 23 -164 43 19 51 16 5 -165 21 47 52 45 18 14 6 57 46 126 -42 -165 53 37 52 57 22 -164 50 26 52 33 11 -166 53 29 53 19 23 -163 53 57 52 10 46 -164 32 58 53 40 55 14 7 6 46 127 -41 -165 5 17 53 53 13 -164 1 9 53 28 34 -166 6 7 54 15 41 -163 3 52 53 5 41 -163 43 23 54 36 50 14 7 16 46 129 -41 -164 16 13 54 49 23 -163 11 4 54 24 14 -165 18 5 55 12 19 -162 12 56 54 0 54 -162 52 55 55 33 5 14 7 25 46 131 -40 -163 26 19 55 45 54 -162 20 4 55 20 13 -164 29 16 56 9 19 -161 21 1 54 56 25 -162 1 26 56 29 42 14 7 35 46 133 -39 -162 35 26 56 42 47 -161 28 1 56 16 34 -163 39 34 57 6 43 -160 28 1 55 52 16 -161 8 48 57 26 43 14 7 44 45 135 -38 -161 43 26 57 40 5 -160 34 47 57 13 17 -162 48 49 58 4 33 -159 33 46 56 48 28 -160 14 51 58 24 9 14 7 54 45 136 -38 -160 50 9 58 37 49 -159 40 12 58 10 25 -161 56 52 59 2 51 -158 38 5 57 45 3 -159 19 24 59 22 3 14 8 3 45 138 -37 -159 55 25 59 36 2 -158 44 5 59 8 0 -161 3 34 60 1 39 -157 40 49 58 42 4 -158 22 15 60 20 26 14 8 13 44 140 -36 -158 59 2 60 34 46 -157 46 12 60 6 4 -160 8 43 61 1 0 -156 41 44 59 39 31 -157 23 9 61 19 22 14 8 22 44 142 -35 -158 0 44 61 34 2 -156 46 20 61 4 38 -159 12 4 62 0 56 -155 40 36 60 37 27 -156 21 49 62 18 51 14 8 32 43 144 -34 -157 0 17 62 33 55 -155 44 12 62 3 45 -158 13 21 63 1 30 -154 37 7 61 35 53 -155 17 56 63 18 57 14 8 41 43 146 -34 -155 57 19 63 34 24 -154 39 29 63 3 28 -157 12 16 64 2 44 -153 30 58 62 34 52 -154 11 8 64 19 42 14 8 51 42 148 -33 -154 51 29 64 35 35 -153 31 46 64 3 47 -156 8 26 65 4 43 -152 21 46 63 34 26 -153 0 55 65 21 9 14 9 0 42 150 -32 -153 42 19 65 37 29 -152 20 36 65 4 47 -155 1 24 66 7 28 -151 9 4 64 34 37 -151 46 47 66 23 19 14 9 10 41 152 -31 -152 29 15 66 40 9 -151 5 28 66 6 28 -153 50 38 67 11 3 -149 52 18 65 35 26 -150 28 1 67 26 17 14 9 19 40 154 -30 -151 11 38 67 43 38 -149 45 39 67 8 55 -152 35 26 68 15 31 -148 30 51 66 36 56 -149 3 48 68 30 4 14 9 29 39 156 -30 -149 48 37 68 48 0 -148 20 22 68 12 8 -151 14 59 69 20 57 -147 3 53 67 39 8 -147 33 7 69 34 44 14 9 38 39 158 -29 -148 19 10 69 53 17 -146 48 36 69 16 11 -149 48 13 70 27 24 -145 30 27 68 42 6 -145 54 38 70 40 19 14 9 48 38 160 -28 -146 41 56 70 59 32 -145 9 3 70 21 6 -148 13 47 71 34 56 -143 49 19 69 45 49 -144 6 42 71 46 50 14 9 57 37 163 -27 -144 55 12 72 6 48 -143 20 6 71 26 54 -146 29 51 72 43 36 -141 58 56 70 50 20 -142 7 7 72 54 20 14 10 7 36 165 -26 -142 56 43 73 15 7 -141 19 38 72 33 36 -144 34 4 73 53 28 -139 57 19 71 55 37 -139 52 57 74 2 49 14 10 16 35 168 -26 -140 43 25 74 24 30 -139 4 51 73 41 12 -142 23 9 75 4 34 -137 41 56 73 1 40 -137 20 14 75 12 13 14 10 25 34 171 -25 -138 11 7 75 34 54 -136 31 59 74 49 39 -139 52 30 76 16 54 -135 9 23 74 8 25 -134 23 28 76 22 29 14 10 35 33 175 -24 -135 13 56 76 46 16 -133 35 55 75 58 50 -136 55 28 77 30 24 -132 15 6 75 15 45 -130 54 49 77 33 21 14 10 44 32 179 -23 -131 43 21 77 58 22 -130 9 24 77 8 33 -133 22 9 78 44 55 -128 52 52 76 23 26 -126 42 51 78 44 28 14 10 54 31 184 -22 -127 26 43 79 10 49 -126 2 7 78 18 23 -128 57 10 80 0 1 -124 54 5 77 31 6 -121 30 37 79 55 4 14 11 3 29 189 -21 -122 4 47 80 22 50 -120 59 4 79 27 39 -123 15 59 81 14 52 -120 6 35 78 38 5 -114 52 39 81 3 46 14 11 13 28 196 -21 -115 7 51 81 32 54 -114 38 14 80 35 4 -115 38 16 82 27 42 -114 13 18 79 43 19 -106 11 29 82 8 2 14 11 22 27 205 -20 -105 50 57 82 38 10 -106 28 4 81 38 22 -104 59 2 83 34 51 -106 50 39 80 44 55 - 94 37 37 83 3 16 14 11 32 25 217 -19 - 93 13 50 83 33 14 - 95 47 25 82 33 35 - 89 48 48 84 28 54 - 97 28 33 81 39 47 - 79 27 26 83 41 40 14 11 41 23 233 -18 - 76 28 13 84 8 48 - 81 57 40 83 14 6 - 69 17 5 84 56 37 - 85 36 41 82 22 55 - 61 1 57 83 52 17 14 11 51 21 251 -17 - 56 23 4 84 12 19 - 65 3 25 83 30 26 - 45 59 20 84 42 25 - 71 5 48 82 47 2 - 41 43 6 83 25 8 14 12 0 19 271 -16 - 36 16 28 83 34 6 - 46 42 57 83 12 54 - 25 18 3 83 40 4 - 54 42 4 82 43 40 - 24 28 12 82 16 25 14 12 10 17 288 -15 - 19 16 18 82 12 34 - 29 30 58 82 16 4 - 9 35 18 81 53 14 - 38 11 5 82 5 58 - 10 25 29 80 25 44 14 12 19 14 302 -14 - 5 53 33 80 8 3 - 14 58 34 80 38 28 2 14 25 79 20 53 - 23 13 33 80 50 26 1 5 41 77 45 22 14 12 29 11 314 -12 5 4 16 77 8 44 - 2 55 31 78 14 44 12 17 42 75 35 29 - 10 22 48 78 53 16 12 2 58 73 26 10 14 12 38 6 325 -11 16 33 19 71 43 52 8 1 35 74 34 9 ... .. .. .. .. .. 0 57 51 75 59 11 Uncertainty in time = +/- 5 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 1424-01029-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 29 27.3535 DE: +19 31 40.291 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .029 ) * V mag [mag]: 12.1 * B mag [mag]: 13.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (679) Pax approx. diameter [km]: 61 approx. diameter ["]: .037 distance from Earth [AU]: 2.27500 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 930 number of rejected observations: 66 time covered by the observations: 1909 Jan 29 - 2012 Nov 29 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.014, 90° remarks: * orbital elements for (679) Pax : Mean anomaly = 77.16117684 deg Arg. of pericenter = 266.84525928 deg Long. of node = 112.26843676 deg Inclination = 24.38809094 deg Eccentricity = 0.31202244 Semimajor axis = 2.58524814 AU Perihelion dist = 1.77859271 AU Mag: H = 9.01, G = 0.15 Epoch of elements : MJD 56266.58700000 TDT (2012 Dec 05.587) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 5 679 Pax 14h 6.5m UT 12.1 10 29 27.353 19 31 40.29TYC 1424-01029-1 13.6 14.0 61 4.9 2.275 1.540 15.98 -129.0318 19.524 -33.91 -22.46 14.1079 -0.40436 0.55189 5.63405 4.12874 -0.00542 0.00197 2000 75.59933020121129.00000266.845259112.268437 24.3880910.31202244 2.5852481 1.7785927 9.0 5.00.15 RATE 2.3711050 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.033 90 1.92 0.034 0 0 5 1 056264.0020121205_1029-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 22:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org