IOTA/IOTA-ES occultation update for (1215) Boyer / TYC 5283-00212-1 event on 2009 Dec 06, 09:25 UT Visible from Summary ------- On 2009 Dec 06 UT, the 20 km diameter asteroid (1215) Boyer will occult a 10.3 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 14.8 mag (the magnitude of the asteroid) for at most 2.6 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: 21 * date and approx. time of event: 2009 Dec 06, 09:18 - 2009 Dec 06, 09:37 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 2.6 * Moon: 79 % sunlit, 101° distance * Sun: 127° distance * rough path description: Additional comments ------------------- close double star The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 3.15 * 1 sigma uncertainty interval [seconds]: +/- 5.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .056 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .057", .037", 76° ) * approx speed of asteroid's shadow [km/s]: 7.5037 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5283-00212-1 by 1215 Boyer on 2009 Dec 6 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 155 57 17 -47 54 30 9 18 16 50 34 0 155 48 23 -47 56 12 156 6 10 -47 52 48 154 51 54 -48 6 49 157 1 43 -47 41 59 155 50 14 -46 23 44 9 18 35 51 36 -1 155 41 36 -46 25 24 155 58 50 -46 22 4 154 46 54 -46 35 50 156 52 41 -46 11 28 155 41 44 -44 54 31 9 18 54 52 37 -2 155 33 21 -44 56 9 155 50 5 -44 52 52 154 40 15 -45 6 24 156 42 24 -44 42 27 155 31 58 -43 26 41 9 19 14 53 38 -3 155 23 49 -43 28 18 155 40 6 -43 25 4 154 32 10 -43 38 23 156 31 2 -43 14 50 155 21 5 -42 0 9 9 19 33 54 39 -4 155 13 9 -42 1 44 155 29 1 -41 58 33 154 22 47 -42 11 39 156 18 41 -41 48 28 155 9 11 -40 34 46 9 19 52 55 41 -4 155 1 26 -40 36 20 155 16 56 -40 33 12 154 12 16 -40 46 7 156 5 27 -40 23 17 154 56 22 -39 10 28 9 20 11 56 42 -5 154 48 47 -39 12 1 155 3 57 -39 8 56 154 0 42 -39 21 39 155 51 25 -38 59 9 154 42 42 -37 47 9 9 20 30 57 44 -6 154 35 16 -37 48 41 154 50 8 -37 45 38 153 48 11 -37 58 11 155 36 38 -37 35 59 154 28 15 -36 24 44 9 20 49 58 46 -6 154 20 58 -36 26 14 154 35 32 -36 23 14 153 34 47 -36 35 37 155 21 10 -36 13 43 154 13 5 -35 3 9 9 21 9 59 48 -7 154 5 55 -35 4 38 154 20 14 -35 1 40 153 20 35 -35 13 53 155 5 2 -34 52 16 153 57 12 -33 42 18 9 21 28 60 50 -8 153 50 10 -33 43 46 154 4 14 -33 40 51 153 5 36 -33 52 55 154 48 18 -33 31 33 153 40 41 -32 22 9 9 21 47 61 52 -8 153 33 45 -32 23 36 153 47 36 -32 20 42 152 49 54 -32 32 39 154 30 58 -32 11 32 153 23 31 -31 2 38 9 22 6 61 54 -9 153 16 41 -31 4 3 153 30 20 -31 1 12 152 33 29 -31 13 0 154 13 4 -30 52 7 153 5 45 -29 43 40 9 22 25 62 56 -9 152 59 1 -29 45 5 153 12 28 -29 42 15 152 16 25 -29 53 56 153 54 37 -29 33 16 152 47 23 -28 25 13 9 22 44 62 59 -10 152 40 45 -28 26 37 152 54 1 -28 23 49 151 58 42 -28 35 23 153 35 38 -28 14 56 152 28 27 -27 7 14 9 23 4 63 61 -10 152 21 53 -27 8 37 152 35 0 -27 5 51 151 40 21 -27 17 18 153 16 6 -26 57 3 152 8 56 -25 49 40 9 23 23 63 64 -11 152 2 26 -25 51 2 152 15 24 -25 48 17 151 21 23 -25 59 38 152 56 3 -25 39 34 151 48 50 -24 32 27 9 23 42 64 66 -11 151 42 25 -24 33 49 151 55 15 -24 31 5 151 1 48 -24 42 20 152 35 28 -24 22 27 151 28 11 -23 15 34 9 24 1 64 69 -12 151 21 50 -23 16 55 151 34 32 -23 14 13 150 41 37 -23 25 21 152 14 22 -23 5 39 151 6 57 -21 58 57 9 24 20 64 72 -12 151 0 39 -22 0 17 151 13 15 -21 57 37 150 20 49 -22 8 39 151 52 43 -21 49 7 150 45 8 -20 42 34 9 24 40 64 75 -13 150 38 54 -20 43 54 150 51 23 -20 41 14 149 59 23 -20 52 12 151 30 31 -20 32 49 150 22 45 -19 26 23 9 24 59 64 77 -13 150 16 33 -19 27 42 150 28 56 -19 25 4 149 37 21 -19 35 56 151 7 46 -19 16 42 149 59 45 -18 10 20 9 25 18 64 80 -13 149 53 35 -18 11 39 150 5 53 -18 9 2 149 14 40 -18 19 49 150 44 28 -18 0 44 149 36 8 -16 54 25 9 25 37 64 83 -14 149 30 1 -16 55 43 149 42 14 -16 53 7 148 51 21 -17 3 49 150 20 34 -16 44 52 149 11 53 -15 38 33 9 25 56 64 86 -14 149 5 48 -15 39 51 149 17 57 -15 37 16 148 27 21 -15 47 54 149 56 4 -15 29 5 148 46 59 -14 22 44 9 26 15 64 88 -14 148 40 56 -14 24 1 148 53 1 -14 21 27 148 2 41 -14 32 1 149 30 56 -14 13 19 148 21 24 -13 6 54 9 26 35 63 91 -15 148 15 23 -13 8 10 148 27 25 -13 5 38 147 37 18 -13 16 7 149 5 9 -12 57 33 147 55 7 -11 51 1 9 26 54 63 93 -15 147 49 7 -11 52 17 148 1 7 -11 49 45 147 11 11 -12 0 11 148 38 42 -11 41 44 147 28 6 -10 35 3 9 27 13 62 96 -15 147 22 7 -10 36 18 147 34 4 -10 33 48 146 44 19 -10 44 9 148 11 32 -10 25 49 147 0 18 - 9 18 57 9 27 32 62 98 -15 146 54 20 - 9 20 12 147 6 15 - 9 17 42 146 16 38 - 9 28 0 147 43 38 - 9 9 47 146 31 42 - 8 2 42 9 27 51 61 100 -16 146 25 45 - 8 3 56 146 37 38 - 8 1 27 145 48 7 - 8 11 41 147 14 57 - 7 53 34 146 2 14 - 6 46 13 9 28 10 61 103 -16 145 56 18 - 6 47 27 146 8 10 - 6 44 59 145 18 43 - 6 55 10 146 45 26 - 6 37 8 145 31 52 - 5 29 29 9 28 30 60 105 -16 145 25 56 - 5 30 43 145 37 48 - 5 28 15 144 48 23 - 5 38 23 146 15 2 - 5 20 28 145 0 33 - 4 12 27 9 28 49 59 107 -16 144 54 37 - 4 13 40 145 6 29 - 4 11 14 144 17 3 - 4 21 18 145 43 43 - 4 3 29 144 28 13 - 2 55 5 9 29 8 58 108 -16 144 22 16 - 2 56 17 144 34 9 - 2 53 52 143 44 41 - 3 3 52 145 11 24 - 2 46 9 143 54 47 - 1 37 18 9 29 27 58 110 -16 143 48 50 - 1 38 30 144 0 44 - 1 36 5 143 11 12 - 1 46 3 144 38 2 - 1 28 25 143 20 12 - 0 19 4 9 29 46 57 112 -16 143 14 14 - 0 20 16 143 26 9 - 0 17 52 142 36 31 - 0 27 46 144 3 32 - 0 10 14 142 44 21 0 59 39 9 30 5 56 113 -17 142 38 23 0 58 28 142 50 20 1 0 51 142 0 33 0 51 1 143 27 49 1 8 27 142 7 10 2 18 57 9 30 25 55 115 -17 142 1 10 2 17 46 142 13 10 2 20 8 141 23 12 2 10 21 142 50 47 2 27 41 141 28 32 3 38 52 9 30 44 54 116 -17 141 22 30 3 37 41 141 34 34 3 40 3 140 44 21 3 30 20 142 12 21 3 47 34 140 48 20 4 59 29 9 31 3 52 117 -16 140 42 16 4 58 18 140 54 23 5 0 39 140 3 54 4 50 59 141 32 22 5 8 7 140 6 24 6 20 51 9 31 22 51 118 -16 140 0 18 6 19 42 140 12 30 6 22 2 139 21 40 6 12 26 140 50 44 6 29 27 139 22 35 7 43 5 9 31 41 50 119 -16 139 16 27 7 41 56 139 28 44 7 44 15 138 37 31 7 34 43 140 7 15 7 51 37 138 36 44 9 6 15 9 32 0 49 120 -16 138 30 31 9 5 6 138 42 55 9 7 24 137 51 15 8 57 56 139 21 46 9 14 44 137 48 35 10 30 27 9 32 20 47 121 -16 137 42 19 10 29 18 137 54 51 10 31 35 137 2 39 10 22 12 138 34 4 10 38 52 136 57 55 11 55 47 9 32 39 46 122 -16 136 51 35 11 54 39 137 4 15 11 56 55 136 11 28 11 47 37 137 43 55 12 4 8 136 4 27 13 22 23 9 32 58 45 122 -16 135 58 2 13 21 16 136 10 51 13 23 31 135 17 22 13 14 19 136 51 1 13 30 40 135 7 48 14 50 24 9 33 17 43 123 -15 135 1 17 14 49 18 135 14 18 14 51 31 134 20 1 14 42 26 135 55 3 14 58 35 134 7 35 16 19 59 9 33 36 42 123 -15 134 0 58 16 18 53 134 14 12 16 21 4 133 18 59 16 12 7 134 55 37 16 28 4 133 3 17 17 51 19 9 33 56 40 124 -15 132 56 32 17 50 14 133 10 1 17 52 23 132 13 44 17 43 35 133 52 13 17 59 16 131 54 16 19 24 37 9 34 15 38 124 -14 131 47 22 19 23 34 132 1 10 19 25 41 131 3 37 19 17 3 132 44 15 19 32 26 130 39 47 21 0 10 9 34 34 36 124 -14 130 32 43 20 59 9 130 46 51 21 1 12 129 47 49 20 52 47 131 31 1 21 7 49 129 18 50 22 38 17 9 34 53 35 124 -13 129 11 33 22 37 17 129 26 6 22 39 17 128 25 18 22 31 8 130 11 32 22 45 43 127 50 7 24 19 21 9 35 12 33 124 -12 127 42 35 24 18 24 127 57 38 24 20 19 126 54 41 24 12 31 128 44 36 24 26 32 126 11 55 26 3 55 9 35 31 30 124 -12 126 4 4 26 3 1 126 19 45 26 4 50 125 14 7 25 57 28 127 8 36 26 10 45 124 21 50 27 52 40 9 35 51 28 123 -11 124 13 35 27 51 50 124 30 3 27 53 31 123 21 0 27 46 44 125 21 17 27 59 2 122 16 19 29 46 33 9 36 10 26 122 -10 122 7 33 29 45 48 122 25 4 29 47 18 121 11 29 29 41 20 123 19 26 29 52 17 119 49 55 31 47 2 9 36 29 23 122 -9 119 40 24 31 46 25 119 59 23 31 47 39 118 39 25 31 42 53 120 58 5 31 51 49 116 53 12 33 56 27 9 36 48 20 120 -7 116 42 33 33 56 4 117 3 46 33 56 51 115 33 59 33 54 3 118 8 58 33 59 46 113 7 19 36 19 22 9 37 7 16 118 -5 112 54 41 36 19 23 113 19 50 36 19 22 111 32 12 36 20 16 114 36 14 36 19 59 107 40 42 39 7 40 9 37 26 11 115 -3 107 23 0 39 8 47 107 58 3 39 6 38 105 21 56 39 17 59 109 40 41 39 1 39 Uncertainty in time = +/- 8 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 5283-00212-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 10 02.8226 DE: -12 02 25.289 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .027 ) * V mag [mag]: 10.3 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1215) Boyer approx. diameter [km]: 20 approx. diameter ["]: .018 distance from Earth [AU]: 1.51000 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 597 number of rejected observations: 46 time covered by the observations: 1932 Jan 19 - 2007 Jun 07 1 sigma uncertainty ellipse (major, minor, PA): 0.053, 0.026, 74° remarks: * orbital elements for (1215) Boyer : Mean anomaly = 12.19263466 deg Arg. of pericenter = 265.51684737 deg Long. of node = 123.79049927 deg Inclination = 15.92152952 deg Eccentricity = 0.13129839 Semimajor axis = 2.57801018 AU Perihelion dist = 2.23952159 AU Mag: H = 10.92, G = 0.15 Epoch of elements : MJD 55171.39300000 TDT (2009 Dec 06.393) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 6 1215 Boyer 9h 25.0m UT 10.3 2 10 2.823-12 2 25.29TYC 5283-00212-1 11.2 14.8 20 2.6 1.510 -0.565 23.23 175.9663 -12.047 36.52 -22.53 9.4163 -0.40933 -0.14690 -1.42747 3.98749 0.00337 0.00295 2000 11.860948200912 5.00000265.516847123.790499 15.9215300.13129839 2.5780102 2.239521611.1 5.00.15 RATE 2.3810970 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.057 0.037 76 4.15 0.057 0 54581.5020091206_0212-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 09:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org