IOTA/IOTA-ES occultation update for (484) Pittsburghia / TYC 6397-00942-1 event on 2012 Nov 20, 10:19 UT Visible from Russia, China Summary ------- On 2012 Nov 20 UT, the 32 km diameter asteroid (484) Pittsburghia will occult a 8.8 mag star in the constellation Aquarius for observers along a path across Russia, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.9 mag to 14.7 mag (the magnitude of the asteroid) for at most 2.7 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: 50 * date and approx. time of event: 2012 Nov 20, 10:18 - 2012 Nov 20, 10:24 UT * geocentric midpoint of event [JD]: 2456251.92974583 * magnitude of target star: 8.8 * magnitude drop [mag]: 5.9 * estimated maximum duration [s]: 2.7 * Moon: 48 % sunlit, 22° distance * Sun: 101° distance * rough path description: Russia, China The occultation path -------------------- * approximate projected width [km]: 47 * 1 sigma uncertainty interval [path widths]: +/- 1.29 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .024", 87° ) * approx speed of asteroid's shadow [km/s]: 12.0612 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6397-00942-1 by 484 Pittsburghia on 2012 Nov 20 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 ' " Longitude Longitude Longitude Longitude 152 45 55 69 0 0 10 24 46 1 201 -33 153 23 44 152 8 5 ... .. .. 150 30 21 151 40 43 68 0 0 10 24 46 2 200 -33 152 16 55 151 4 30 ... .. .. 149 30 55 150 37 47 67 0 0 10 24 46 3 199 -33 151 12 31 150 3 2 ... .. .. 148 33 12 149 36 48 66 0 0 10 24 45 4 198 -34 150 10 12 149 3 22 151 36 15 147 36 56 148 37 28 65 0 0 10 24 44 5 197 -34 149 9 39 148 5 14 150 32 34 146 41 55 147 39 35 64 0 0 10 24 42 6 196 -34 148 10 40 147 8 27 149 30 42 145 47 58 146 42 56 63 0 0 10 24 41 7 196 -34 147 13 0 146 12 49 148 30 25 144 54 56 145 47 21 62 0 0 10 24 39 8 195 -34 146 16 30 145 18 10 147 31 30 144 2 40 144 52 42 61 0 0 10 24 36 9 194 -34 145 20 59 144 24 22 146 33 47 143 11 4 143 58 51 60 0 0 10 24 34 10 193 -34 144 26 20 143 31 18 145 37 6 142 20 1 143 5 39 59 0 0 10 24 31 11 192 -34 143 32 26 142 38 50 144 41 18 141 29 26 142 13 2 58 0 0 10 24 28 12 191 -33 142 39 8 141 46 54 143 46 16 140 39 13 141 20 54 57 0 0 10 24 25 14 191 -33 141 46 22 140 55 22 142 51 53 139 49 17 140 29 8 56 0 0 10 24 21 15 190 -33 140 54 2 140 4 11 141 58 4 138 59 35 139 37 41 55 0 0 10 24 17 16 189 -33 140 2 3 139 13 17 141 4 42 138 10 3 138 46 29 54 0 0 10 24 13 17 188 -32 139 10 21 138 22 33 140 11 43 137 20 36 137 55 26 53 0 0 10 24 8 18 187 -32 138 18 51 137 31 58 139 19 2 136 31 11 137 4 30 52 0 0 10 24 3 19 187 -32 137 27 29 136 41 27 138 26 34 135 41 45 136 13 36 51 0 0 10 23 58 20 186 -31 136 36 12 135 50 57 137 34 16 134 52 15 135 22 41 50 0 0 10 23 53 21 185 -31 135 44 55 135 0 23 136 42 3 134 2 37 134 31 42 49 0 0 10 23 47 22 184 -30 134 53 36 134 9 44 135 49 52 133 12 49 133 40 35 48 0 0 10 23 41 23 183 -30 134 2 10 133 18 56 134 57 39 132 22 48 132 49 17 47 0 0 10 23 35 24 182 -29 133 10 36 132 27 55 134 5 20 131 32 30 131 57 45 46 0 0 10 23 28 25 181 -29 132 18 49 131 36 38 133 12 53 130 41 53 131 5 57 45 0 0 10 23 21 26 180 -28 131 26 46 130 45 4 132 20 14 129 50 54 130 13 48 44 0 0 10 23 14 27 179 -28 130 34 24 129 53 7 131 27 19 128 59 30 129 21 15 43 0 0 10 23 7 28 178 -27 129 41 40 129 0 46 130 34 5 128 7 37 128 28 16 42 0 0 10 22 59 29 177 -26 128 48 31 128 7 57 129 40 30 127 15 13 127 34 46 41 0 0 10 22 51 30 176 -25 127 54 53 127 14 36 128 46 28 126 22 15 126 40 44 40 0 0 10 22 42 31 175 -25 127 0 43 126 20 41 127 51 58 125 28 38 125 46 4 39 0 0 10 22 33 32 174 -24 126 5 57 125 26 7 126 56 55 124 34 20 124 50 43 38 0 0 10 22 24 33 173 -23 125 10 31 124 30 52 126 1 16 123 39 17 123 54 38 37 0 0 10 22 15 34 172 -22 124 14 22 123 34 50 125 4 56 122 43 24 122 57 44 36 0 0 10 22 5 35 171 -21 123 17 25 122 37 59 124 7 52 121 46 38 121 59 57 35 0 0 10 21 55 35 169 -20 122 19 37 121 40 13 123 10 0 120 48 54 121 1 12 34 0 0 10 21 45 36 168 -19 121 20 52 120 41 27 122 11 14 119 50 7 120 1 24 33 0 0 10 21 34 37 167 -18 120 21 5 119 41 38 121 11 30 118 50 12 119 0 28 32 0 0 10 21 23 38 165 -17 119 20 12 118 40 38 120 10 43 117 49 4 117 58 17 31 0 0 10 21 12 38 164 -16 118 18 5 117 38 23 119 8 47 116 46 35 116 54 45 30 0 0 10 21 0 39 162 -14 117 14 40 116 34 45 118 5 35 115 42 39 115 49 45 29 0 0 10 20 48 40 161 -13 116 9 48 115 29 37 117 1 2 114 37 9 114 43 10 28 0 0 10 20 35 40 159 -12 115 3 22 114 22 51 115 54 59 113 29 55 113 34 49 27 0 0 10 20 22 41 157 -11 113 55 13 113 14 18 114 47 19 112 20 48 112 24 33 26 0 0 10 20 9 41 156 -9 112 45 11 112 3 47 113 37 51 111 9 38 111 12 11 25 0 0 10 19 55 42 154 -8 111 33 5 110 51 8 112 26 26 109 56 11 109 57 29 24 0 0 10 19 41 42 152 -7 110 18 43 109 36 6 111 12 52 108 40 14 108 40 13 23 0 0 10 19 27 42 150 -5 109 1 51 108 18 27 109 56 55 107 21 29 107 20 6 22 0 0 10 19 12 43 148 -3 107 42 10 106 57 51 108 38 20 105 59 38 105 56 46 21 0 0 10 18 56 43 146 -2 106 19 22 105 33 59 107 16 48 104 34 16 104 29 49 20 0 0 10 18 40 43 144 0 104 53 2 104 6 24 105 51 58 103 4 56 Uncertainty in time = +/- 4 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 6397-00942-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 04 55.5258 DE: -19 05 33.731 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .022 ) * V mag [mag]: 8.8 * B mag [mag]: 10.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (484) Pittsburghia approx. diameter [km]: 32 approx. diameter ["]: .020 distance from Earth [AU]: 2.17500 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1027 number of rejected observations: 98 time covered by the observations: 1902 Apr 29 - 2012 Oct 27 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.011, 81° remarks: * orbital elements for (484) Pittsburghia : Mean anomaly = 41.91535845 deg Arg. of pericenter = 189.35921368 deg Long. of node = 127.31559667 deg Inclination = 12.50326228 deg Eccentricity = 0.05615535 Semimajor axis = 2.66689505 AU Perihelion dist = 2.51713464 AU Mag: H = 9.69, G = 0.15 Epoch of elements : MJD 56251.43000000 TDT (2012 Nov 20.430) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 20 484 Pittsburghia 10h 18.8m UT 8.8 23 4 55.526-19 5 33.73TYC 6397-00942-1 10.0 14.7 32 2.7 2.175 1.597 15.67 131.6856 -19.096 21.73 -19.83 10.3139 -0.41734 0.60394 5.59761 3.87448 0.00515 0.00247 2000 41.59174120121119.00000189.359214127.315597 12.5032620.05615535 2.6668951 2.5171346 9.9 5.00.15 RATE 2.2630550 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.024 87 2.29 0.026 0 0-2-1 056247.0020121120_0942-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org