IOTA/IOTA-ES occultation update for (1021) Flammario / TYC 6293-00370-1 event on 2012 Aug 08, 05:00 UT Visible from W Canada (twilight) Summary ------- On 2012 Aug 08 UT, the 97 km diameter asteroid (1021) Flammario will occult a 9.5 mag star in the constellation Sagittarius for observers along a path across W Canada (twilight). In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 13.3 mag (the magnitude of the asteroid) for at most 9.4 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: 94 * date and approx. time of event: 2012 Aug 08, 04:56 - 2012 Aug 08, 05:02 UT * geocentric midpoint of event [JD]: 2456147.7087125 * magnitude of target star: 9.5 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 9.4 * Moon: 65 % sunlit, 106° distance * Sun: 146° distance * rough path description: W Canada (twilight) The occultation path -------------------- * approximate projected width [km]: 229 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .031", 93° ) * approx speed of asteroid's shadow [km/s]: 10.3988 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6293-00370-1 by 1021 Flammario on 2012 Aug 8 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 -126 25 32 64 0 0 4 56 19 3 163 0 -128 56 37 -124 1 37 -131 23 14 ... .. .. -126 1 53 63 0 0 4 56 20 4 163 -1 -128 26 30 -123 43 46 -130 46 22 ... .. .. -125 44 58 62 0 0 4 56 22 5 163 -2 -128 3 56 -123 31 56 -130 17 59 -121 34 2 -125 34 2 61 0 0 4 56 24 6 164 -2 -127 48 3 -123 25 30 -129 57 3 -121 31 26 -125 28 29 60 0 0 4 56 27 7 164 -3 -127 38 9 -123 23 57 -129 42 43 -121 33 17 -125 27 49 59 0 0 4 56 30 8 164 -4 -127 33 38 -123 26 50 -129 34 19 -121 39 13 -125 31 37 58 0 0 4 56 33 9 164 -4 -127 34 1 -123 33 47 -129 31 18 -121 48 54 -125 39 32 57 0 0 4 56 37 10 163 -5 -127 38 55 -123 44 31 -129 33 12 -122 2 5 -125 51 17 56 0 0 4 56 42 11 163 -5 -127 48 0 -123 58 46 -129 39 38 -122 18 31 -126 6 38 55 0 0 4 56 47 11 163 -6 -128 0 59 -124 16 20 -129 50 18 -122 38 2 -126 25 22 54 0 0 4 56 52 12 163 -7 -128 17 39 -124 37 3 -130 4 57 -123 0 28 -126 47 21 53 0 0 4 56 58 13 162 -7 -128 37 49 -125 0 45 -130 23 23 -123 25 42 -127 12 26 52 0 0 4 57 4 14 162 -7 -129 1 21 -125 27 20 -130 45 24 -123 53 37 -127 40 32 51 0 0 4 57 10 15 161 -8 -129 28 7 -125 56 43 -131 10 55 -124 24 10 -128 11 33 50 0 0 4 57 17 16 161 -8 -129 58 2 -126 28 49 -131 39 48 -124 57 15 -128 45 27 49 0 0 4 57 25 17 160 -8 -130 31 3 -127 3 36 -132 12 1 -125 32 51 -129 22 11 48 0 0 4 57 33 17 159 -9 -131 7 8 -127 41 2 -132 47 31 -126 10 56 -130 1 47 47 0 0 4 57 41 18 159 -9 -131 46 17 -128 21 8 -133 26 18 -126 51 31 -130 44 14 46 0 0 4 57 50 19 158 -9 -132 28 30 -129 3 53 -134 8 24 -127 34 36 -131 29 35 45 0 0 4 58 0 20 157 -9 -133 13 51 -129 49 20 -134 53 52 -128 20 12 -132 17 54 44 0 0 4 58 10 20 156 -9 -134 2 25 -130 37 32 -135 42 47 -129 8 24 -133 9 17 43 0 0 4 58 20 21 155 -9 -134 54 17 -131 28 35 -136 35 18 -129 59 15 -134 3 52 42 0 0 4 58 31 22 154 -9 -135 49 38 -132 22 35 -137 31 35 -130 52 51 -135 1 47 41 0 0 4 58 43 22 153 -9 -136 48 38 -133 19 39 -138 31 52 -131 49 19 -136 3 15 40 0 0 4 58 55 23 152 -9 -137 51 33 -134 19 59 -139 36 26 -132 48 49 -137 8 31 39 0 0 4 59 7 23 151 -9 -138 58 40 -135 23 47 -140 45 41 -133 51 31 -138 17 55 38 0 0 4 59 21 24 150 -9 -140 10 23 -136 31 19 -142 0 6 -134 57 39 -139 31 50 37 0 0 4 59 35 24 149 -8 -141 27 12 -137 42 55 -143 20 18 -136 7 30 -140 50 47 36 0 0 4 59 50 25 147 -8 -142 49 47 -138 59 0 -144 47 10 -137 21 25 -142 15 26 35 0 0 5 0 6 25 146 -7 -144 19 0 -140 20 3 -146 21 50 -138 39 49 -143 46 38 34 0 0 5 0 22 25 144 -7 -145 55 59 -141 46 47 -148 5 55 -140 3 15 -145 25 33 33 0 0 5 0 40 25 143 -6 -147 42 25 -143 20 3 -150 1 52 -141 32 24 -147 13 50 32 0 0 5 0 59 25 141 -5 -149 40 45 -145 1 2 -152 13 34 -143 8 12 -149 13 55 31 0 0 5 1 19 25 139 -4 -151 54 51 -146 51 23 -154 47 57 -144 51 52 Latitude Latitude Latitude Latitude -151 0 0 30 12 24 5 1 36 24 137 -3 31 23 33 29 4 39 32 32 29 28 4 53 -152 0 0 29 47 39 5 1 46 24 137 -2 30 57 52 28 40 42 32 5 48 27 41 35 -153 0 0 29 24 26 5 1 55 24 136 -2 30 33 47 28 18 12 31 40 49 27 19 41 -154 0 0 29 2 42 5 2 5 23 135 -1 30 11 17 27 57 8 31 17 29 26 59 11 -155 0 0 28 42 25 5 2 14 23 134 0 29 50 18 27 37 29 30 55 46 26 40 1 Uncertainty in time = +/- 5 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 6293-00370-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 52 11.1633 DE: -22 12 09.385 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .033, .027 ) * V mag [mag]: 9.5 * B mag [mag]: 10.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1021) Flammario approx. diameter [km]: 97 approx. diameter ["]: .071 distance from Earth [AU]: 1.87200 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 965 number of rejected observations: 71 time covered by the observations: 1925 May 18 - 2012 Jul 18 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.014, 104° remarks: * orbital elements for (1021) Flammario : Mean anomaly = 283.75238262 deg Arg. of pericenter = 287.23153977 deg Long. of node = 115.45679302 deg Inclination = 15.86823667 deg Eccentricity = 0.28450767 Semimajor axis = 2.73800799 AU Perihelion dist = 1.95902372 AU Mag: H = 9.01, G = 0.15 Epoch of elements : MJD 56147.20900000 TDT (2012 Aug 08.209) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 8 1021 Flammario 5h 0.5m UT 9.5 18 52 11.163-22 12 9.39TYC 6293-00370-1 10.0 13.3 97 9.4 1.872 -1.671 -14.87 -109.2025 -22.197 106.27 16.02 5.0091 -0.48846 0.76278 -4.94263 -3.16539 0.00307 0.00022 2000 282.1840912012 8 1.00000287.231540115.456793 15.8682370.28450767 2.7380080 1.9590237 9.0 5.00.15 RATE 2.1754640 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.031 93 1.46 0.033 0 0 3 5 056129.0020120808_0370-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 14:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org