IOTA/IOTA-ES occultation update for (1054) Forsytia / UCAC2 20987826 event on 2009 Jul 05, 05:02 UT Visible from Summary ------- On 2009 Jul 05 UT, the 50 km diameter asteroid (1054) Forsytia will occult a 11.3 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.3 mag to 14.5 mag (the magnitude of the asteroid) for at most 5.4 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: 41 * date and approx. time of event: 2009 Jul 05, 04:52 - 2009 Jul 05, 05:09 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 3.3 * estimated maximum duration [s]: 5.4 * Moon: 96 % sunlit, 51° distance * Sun: 151° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 65 * 1 sigma uncertainty interval [path widths]: +/- 1.61 * 1 sigma uncertainty interval [seconds]: +/- 8.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .066 +/- .055) * 1 sigma uncertainty ellipse (major, minor, PA): ( .066", .055", 86° ) * approx speed of asteroid's shadow [km/s]: 9.2508 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 20987826 by 1054 Forsytia on 2009 Jul 5 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 - 33 49 6 62 0 0 4 52 10 1 186 0 - 34 27 31 - 33 10 50 - 36 32 5 ... .. .. - 34 5 38 61 0 0 4 52 10 2 186 -1 - 34 42 54 - 33 28 30 - 36 43 45 ... .. .. - 34 23 3 60 0 0 4 52 11 3 186 -2 - 34 59 15 - 33 46 57 - 36 56 40 ... .. .. - 34 41 16 59 0 0 4 52 12 4 185 -3 - 35 16 29 - 34 6 9 - 37 10 43 ... .. .. - 35 0 15 58 0 0 4 52 13 5 185 -4 - 35 34 34 - 34 26 3 - 37 25 50 ... .. .. - 35 19 59 57 0 0 4 52 15 6 185 -5 - 35 53 26 - 34 46 37 - 37 41 56 - 32 59 53 - 35 40 24 56 0 0 4 52 17 7 185 -6 - 36 13 4 - 35 7 50 - 37 59 0 - 33 23 36 - 36 1 29 55 0 0 4 52 19 8 184 -7 - 36 33 25 - 35 29 39 - 38 16 57 - 33 47 47 - 36 23 12 54 0 0 4 52 22 9 184 -7 - 36 54 27 - 35 52 4 - 38 35 45 - 34 12 24 - 36 45 33 53 0 0 4 52 24 10 184 -8 - 37 16 9 - 36 15 3 - 38 55 21 - 34 37 26 - 37 8 30 52 0 0 4 52 27 11 183 -9 - 37 38 30 - 36 38 36 - 39 15 45 - 35 2 55 - 37 32 3 51 0 0 4 52 31 12 183 -10 - 38 1 28 - 37 2 42 - 39 36 53 - 35 28 49 - 37 56 10 50 0 0 4 52 34 13 183 -11 - 38 25 4 - 37 27 21 - 39 58 46 - 35 55 9 - 38 20 51 49 0 0 4 52 38 14 182 -12 - 38 49 15 - 37 52 32 - 40 21 21 - 36 21 55 - 38 46 5 48 0 0 4 52 42 16 182 -13 - 39 14 2 - 38 18 14 - 40 44 37 - 36 49 7 - 39 11 53 47 0 0 4 52 47 17 182 -14 - 39 39 24 - 38 44 28 - 41 8 35 - 37 16 44 - 39 38 14 46 0 0 4 52 51 18 181 -15 - 40 5 20 - 39 11 14 - 41 33 12 - 37 44 48 - 40 5 8 45 0 0 4 52 57 19 181 -16 - 40 31 51 - 39 38 30 - 41 58 29 - 38 13 18 - 40 32 35 44 0 0 4 53 2 20 180 -17 - 40 58 57 - 40 6 19 - 42 24 26 - 38 42 15 - 41 0 35 43 0 0 4 53 7 21 180 -18 - 41 26 37 - 40 34 39 - 42 51 1 - 39 11 39 - 41 29 9 42 0 0 4 53 13 22 179 -19 - 41 54 52 - 41 3 31 - 43 18 15 - 39 41 31 - 41 58 16 41 0 0 4 53 20 23 179 -20 - 42 23 41 - 41 32 55 - 43 46 9 - 40 11 51 - 42 27 56 40 0 0 4 53 26 24 179 -22 - 42 53 5 - 42 2 52 - 44 14 41 - 40 42 40 - 42 58 11 39 0 0 4 53 33 24 178 -23 - 43 23 5 - 42 33 22 - 44 43 52 - 41 13 59 - 43 29 0 38 0 0 4 53 40 25 178 -24 - 43 53 41 - 43 4 25 - 45 13 43 - 41 45 47 - 44 0 25 37 0 0 4 53 47 26 177 -25 - 44 24 53 - 43 36 3 - 45 44 13 - 42 18 6 - 44 32 26 36 0 0 4 53 55 27 177 -26 - 44 56 41 - 44 8 15 - 46 15 24 - 42 50 57 - 45 5 3 35 0 0 4 54 3 28 176 -27 - 45 29 8 - 44 41 3 - 46 47 16 - 43 24 20 - 45 38 17 34 0 0 4 54 11 29 175 -28 - 46 2 12 - 45 14 27 - 47 19 49 - 43 58 16 - 46 12 10 33 0 0 4 54 19 30 175 -29 - 46 35 56 - 45 48 29 - 47 53 5 - 44 32 47 - 46 46 42 32 0 0 4 54 28 31 174 -30 - 47 10 20 - 46 23 9 - 48 27 4 - 45 7 52 - 47 21 54 31 0 0 4 54 37 32 174 -31 - 47 45 25 - 46 58 28 - 49 1 47 - 45 43 34 - 47 57 47 30 0 0 4 54 47 33 173 -32 - 48 21 12 - 47 34 27 - 49 37 15 - 46 19 54 - 48 34 23 29 0 0 4 54 56 34 172 -33 - 48 57 43 - 48 11 8 - 50 13 30 - 46 56 53 - 49 11 43 28 0 0 4 55 6 35 172 -35 - 49 34 59 - 48 48 32 - 50 50 32 - 47 34 31 - 49 49 48 27 0 0 4 55 17 36 171 -36 - 50 13 0 - 49 26 41 - 51 28 24 - 48 12 51 - 50 28 39 26 0 0 4 55 27 37 170 -37 - 50 51 49 - 50 5 35 - 52 7 6 - 48 51 54 - 51 8 19 25 0 0 4 55 38 38 169 -38 - 51 31 28 - 50 45 17 - 52 46 41 - 49 31 42 - 51 48 50 24 0 0 4 55 49 39 168 -39 - 52 11 58 - 51 25 48 - 53 27 10 - 50 12 16 - 52 30 12 23 0 0 4 56 0 39 167 -40 - 52 53 21 - 52 7 10 - 54 8 35 - 50 53 39 - 53 12 29 22 0 0 4 56 12 40 166 -41 - 53 35 39 - 52 49 25 - 54 50 58 - 51 35 51 - 53 55 42 21 0 0 4 56 24 41 166 -43 - 54 18 54 - 53 32 36 - 55 34 22 - 52 18 56 - 54 39 54 20 0 0 4 56 36 42 165 -44 - 55 3 10 - 54 16 45 - 56 18 50 - 53 2 56 - 55 25 7 19 0 0 4 56 49 43 163 -45 - 55 48 27 - 55 1 54 - 57 4 24 - 53 47 53 - 56 11 25 18 0 0 4 57 2 43 162 -46 - 56 34 51 - 55 48 7 - 57 51 6 - 54 33 50 - 56 58 51 17 0 0 4 57 15 44 161 -47 - 57 22 23 - 56 35 26 - 58 39 2 - 55 20 49 - 57 47 27 16 0 0 4 57 29 45 160 -48 - 58 11 7 - 57 23 54 - 59 28 14 - 56 8 55 - 58 37 17 15 0 0 4 57 42 45 159 -50 - 59 1 7 - 58 13 36 - 60 18 45 - 56 58 10 - 59 28 26 14 0 0 4 57 57 46 157 -51 - 59 52 26 - 59 4 34 - 61 10 42 - 57 48 37 - 60 20 58 13 0 0 4 58 11 47 156 -52 - 60 45 11 - 59 56 55 - 62 4 8 - 58 40 22 - 61 14 58 12 0 0 4 58 26 47 155 -53 - 61 39 24 - 60 50 41 - 62 59 9 - 59 33 28 - 62 10 31 11 0 0 4 58 41 48 153 -55 - 62 35 13 - 61 45 59 - 63 55 51 - 60 28 1 - 63 7 43 10 0 0 4 58 56 48 152 -56 - 63 32 42 - 62 42 54 - 64 54 20 - 61 24 5 - 64 6 41 9 0 0 4 59 12 49 150 -57 - 64 32 0 - 63 41 33 - 65 54 45 - 62 21 46 - 65 7 32 8 0 0 4 59 28 49 148 -58 - 65 33 12 - 64 42 3 - 66 57 13 - 63 21 12 - 66 10 24 7 0 0 4 59 45 49 147 -59 - 66 36 29 - 65 44 32 - 68 1 54 - 64 22 29 - 67 15 28 6 0 0 5 0 2 50 145 -61 - 67 42 0 - 66 49 8 - 69 8 59 - 65 25 46 - 68 22 52 5 0 0 5 0 19 50 143 -62 - 68 49 55 - 67 56 3 - 70 18 40 - 66 31 11 - 69 32 51 4 0 0 5 0 37 50 141 -63 - 70 0 28 - 69 5 28 - 71 31 12 - 67 38 56 - 70 45 37 3 0 0 5 0 55 50 139 -64 - 71 13 53 - 70 17 37 - 72 46 52 - 68 49 13 - 72 1 28 2 0 0 5 1 14 50 138 -65 - 72 30 28 - 71 32 46 - 74 6 0 - 70 2 15 - 73 20 42 1 0 0 5 1 33 50 136 -66 - 73 50 32 - 72 51 12 - 75 28 59 - 71 18 18 - 74 43 43 0 0 0 5 1 52 50 134 -67 - 75 14 30 - 74 13 18 - 76 56 19 - 72 37 41 - 76 10 58 - 1 0 0 5 2 13 49 132 -68 - 76 42 50 - 75 39 29 - 78 28 33 - 74 0 47 Latitude Latitude Latitude Latitude - 78 0 0 - 2 10 43 5 2 37 49 130 -69 - 1 49 51 - 2 31 27 - 0 41 47 - 3 37 26 - 79 0 0 - 2 47 39 5 2 50 48 128 -70 - 2 27 0 - 3 8 10 - 1 19 41 - 4 13 29 - 80 0 0 - 3 23 13 5 3 3 48 127 -70 - 3 2 47 - 3 43 33 - 1 56 9 - 4 48 14 - 81 0 0 - 3 57 27 5 3 16 48 126 -70 - 3 37 13 - 4 17 35 - 2 31 14 - 5 21 40 - 82 0 0 - 4 30 23 5 3 29 47 125 -70 - 4 10 19 - 4 50 19 - 3 4 58 - 5 53 50 - 83 0 0 - 5 2 0 5 3 41 47 124 -71 - 4 42 8 - 5 21 47 - 3 37 22 - 6 24 45 - 84 0 0 - 5 32 22 5 3 53 46 123 -71 - 5 12 40 - 5 51 58 - 4 8 28 - 6 54 25 - 85 0 0 - 6 1 29 5 4 5 46 122 -71 - 5 41 56 - 6 20 56 - 4 38 16 - 7 22 53 - 86 0 0 - 6 29 22 5 4 17 45 122 -70 - 6 9 58 - 6 48 40 - 5 6 49 - 7 50 9 - 87 0 0 - 6 56 2 5 4 29 44 121 -70 - 6 36 47 - 7 15 12 - 5 34 7 - 8 16 15 - 88 0 0 - 7 21 32 5 4 40 44 120 -70 - 7 2 25 - 7 40 33 - 6 0 11 - 8 41 11 - 89 0 0 - 7 45 50 5 4 51 43 120 -70 - 7 26 51 - 8 4 44 - 6 25 3 - 9 4 58 - 90 0 0 - 8 9 0 5 5 2 43 119 -70 - 7 50 8 - 8 27 46 - 6 48 44 - 9 27 38 - 91 0 0 - 8 31 1 5 5 13 42 118 -69 - 8 12 16 - 8 49 41 - 7 11 15 - 9 49 11 - 92 0 0 - 8 51 55 5 5 23 41 118 -69 - 8 33 16 - 9 10 28 - 7 32 37 -10 9 38 - 93 0 0 - 9 11 41 5 5 34 41 117 -68 - 8 53 9 - 9 30 9 - 7 52 50 -10 29 0 - 94 0 0 - 9 30 22 5 5 44 40 117 -68 - 9 11 55 - 9 48 44 - 8 11 55 -10 47 18 - 95 0 0 - 9 47 58 5 5 53 39 117 -67 - 9 29 36 -10 6 15 - 8 29 54 -11 4 32 - 96 0 0 -10 4 29 5 6 3 38 116 -66 - 9 46 13 -10 22 41 - 8 46 47 -11 20 43 - 97 0 0 -10 19 57 5 6 13 38 116 -66 -10 1 45 -10 38 4 - 9 2 34 -11 35 52 - 98 0 0 -10 34 21 5 6 22 37 116 -65 -10 16 13 -10 52 24 - 9 17 16 -11 49 59 - 99 0 0 -10 47 42 5 6 31 36 115 -65 -10 29 38 -11 5 41 - 9 30 54 -12 3 4 -100 0 0 -11 0 1 5 6 40 35 115 -64 -10 42 1 -11 17 57 - 9 43 28 -12 15 9 -101 0 0 -11 11 19 5 6 49 35 115 -63 -10 53 22 -11 29 11 - 9 55 0 -12 26 13 -102 0 0 -11 21 35 5 6 57 34 115 -62 -11 3 40 -11 39 24 -10 5 28 -12 36 18 -103 0 0 -11 30 50 5 7 5 33 114 -62 -11 12 58 -11 48 37 -10 14 54 -12 45 22 -104 0 0 -11 39 4 5 7 14 32 114 -61 -11 21 14 -11 56 49 -10 23 17 -12 53 27 -105 0 0 -11 46 17 5 7 21 31 114 -60 -11 28 30 -12 4 0 -10 30 39 -13 0 33 -106 0 0 -11 52 31 5 7 29 31 114 -59 -11 34 44 -12 10 12 -10 36 59 -13 6 40 -107 0 0 -11 57 44 5 7 37 30 114 -58 -11 39 59 -12 15 24 -10 42 17 -13 11 48 -108 0 0 -12 1 57 5 7 44 29 114 -57 -11 44 13 -12 19 36 -10 46 34 -13 15 58 -109 0 0 -12 5 10 5 7 51 28 114 -57 -11 47 26 -12 22 49 -10 49 49 -13 19 8 -110 0 0 -12 7 23 5 7 58 27 114 -56 -11 49 39 -12 25 1 -10 52 3 -13 21 20 -111 0 0 -12 8 36 5 8 5 26 114 -55 -11 50 52 -12 26 15 -10 53 16 -13 22 34 -112 0 0 -12 8 49 5 8 11 26 114 -54 -11 51 5 -12 26 28 -10 53 27 -13 22 48 -113 0 0 -12 8 1 5 8 18 25 114 -53 -11 50 17 -12 25 41 -10 52 36 -13 22 4 -114 0 0 -12 6 13 5 8 24 24 114 -52 -11 48 28 -12 23 54 -10 50 44 -13 20 20 -115 0 0 -12 3 25 5 8 30 23 114 -51 -11 45 38 -12 21 7 -10 47 49 -13 17 37 -116 0 0 -11 59 35 5 8 36 22 114 -50 -11 41 46 -12 17 19 -10 43 52 -13 13 54 -117 0 0 -11 54 44 5 8 41 21 114 -50 -11 36 53 -12 12 30 -10 38 52 -13 9 12 -118 0 0 -11 48 51 5 8 46 20 114 -49 -11 30 58 -12 6 40 -10 32 49 -13 3 29 -119 0 0 -11 41 56 5 8 52 19 114 -48 -11 24 0 -11 59 47 -10 25 42 -12 56 45 -120 0 0 -11 33 58 5 8 56 18 114 -47 -11 15 59 -11 51 53 -10 17 30 -12 49 0 -121 0 0 -11 24 57 5 9 1 17 115 -46 -11 6 55 -11 42 55 -10 8 14 -12 40 13 -122 0 0 -11 14 52 5 9 6 16 115 -45 -10 56 46 -11 32 54 - 9 57 52 -12 30 24 -123 0 0 -11 3 42 5 9 10 15 115 -44 -10 45 32 -11 21 48 - 9 46 24 -12 19 31 -124 0 0 -10 51 27 5 9 14 15 115 -43 -10 33 12 -11 9 37 - 9 33 49 -12 7 35 -125 0 0 -10 38 6 5 9 18 14 115 -42 -10 19 45 -10 56 21 - 9 20 5 -11 54 34 -126 0 0 -10 23 37 5 9 21 13 115 -41 -10 5 11 -10 41 58 - 9 5 13 -11 40 28 -127 0 0 -10 8 0 5 9 25 12 115 -40 - 9 49 28 -10 26 27 - 8 49 10 -11 25 15 -128 0 0 - 9 51 14 5 9 28 11 116 -39 - 9 32 36 -10 9 47 - 8 31 57 -11 8 55 -129 0 0 - 9 33 18 5 9 30 10 116 -38 - 9 14 33 - 9 51 58 - 8 13 31 -10 51 26 -130 0 0 - 9 14 10 5 9 33 9 116 -37 - 8 55 18 - 9 32 57 - 7 53 52 -10 32 48 -131 0 0 - 8 53 50 5 9 35 8 116 -36 - 8 34 50 - 9 12 44 - 7 32 58 -10 12 59 -132 0 0 - 8 32 15 5 9 37 7 116 -35 - 8 13 7 - 8 51 18 - 7 10 47 - 9 51 58 -133 0 0 - 8 9 25 5 9 39 5 116 -34 - 7 50 8 - 8 28 36 - 6 47 19 .. .. .. -134 0 0 - 7 45 18 5 9 40 4 116 -33 - 7 25 51 - 8 4 38 - 6 22 31 .. .. .. -135 0 0 - 7 19 52 5 9 42 3 116 -32 - 7 0 16 - 7 39 22 - 5 56 22 .. .. .. -136 0 0 - 6 53 6 5 9 42 2 117 -31 - 6 33 19 - 7 12 47 - 5 28 50 .. .. .. -137 0 0 - 6 24 58 5 9 43 1 117 -29 - 6 4 59 - 6 44 49 - 4 59 53 .. .. .. -138 0 0 - 5 55 25 5 9 43 0 117 -28 .. .. .. - 6 15 28 .. .. .. .. .. .. Uncertainty in time = +/- 10 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 20987826 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 02 06.5512 DE: -26 40 41.636 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .051, .051 ) * V mag [mag]: 11.3 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1054) Forsytia approx. diameter [km]: 50 approx. diameter ["]: .037 distance from Earth [AU]: 1.85400 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 835 number of rejected observations: 48 time covered by the observations: 1925 Nov 20 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.042, 0.022, 80° remarks: * orbital elements for (1054) Forsytia : Mean anomaly = 296.59983352 deg Arg. of pericenter = 293.75725121 deg Long. of node = 86.05735864 deg Inclination = 10.85588891 deg Eccentricity = 0.13913142 Semimajor axis = 2.92231990 AU Perihelion dist = 2.51573337 AU Mag: H = 10.45, G = 0.15 Epoch of elements : MJD 55017.21000000 TDT (2009 Jul 05.210) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 5 1054 Forsytia 5h 0.9m UT 11.3 21 2 6.551-26 40 41.64UCAC2 20987826 0.0 14.5 50 5.4 1.854 -1.271 -18.00 -43.0330 -26.673 105.92 22.77 5.0153 -0.46705 0.44215 -3.58797 -3.79337 -0.00263 0.00005 2000 295.1773492009 628.00000293.757251 86.057359 10.8558890.13913142 2.9223199 2.515733410.3 5.00.15 RATE 1.9729330 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.066 0.055 86 2.61 0.060 0 54545.5020090705_987826 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org