IOTA/IOTA-ES occultation update for (1227) Geranium / TYC 2327-01629-1 event on 2012 Nov 22, 11:55 UT Visible from N Canada, Russia Summary ------- On 2012 Nov 22 UT, the 46 km diameter asteroid (1227) Geranium will occult a 8.9 mag star in the constellation Triangulum for observers along a path across N Canada, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.8 mag to 15.7 mag (the magnitude of the asteroid) for at most 3.4 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: 47 * date and approx. time of event: 2012 Nov 22, 11:51 - 2012 Nov 22, 11:59 UT * geocentric midpoint of event [JD]: 2456253.99729583 * magnitude of target star: 8.9 * magnitude drop [mag]: 6.8 * estimated maximum duration [s]: 3.4 * Moon: 69 % sunlit, 54° distance * Sun: 157° distance * rough path description: N Canada, Russia The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 1.37 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .040) * 1 sigma uncertainty ellipse (major, minor, PA): ( .049", .035", 56° ) * approx speed of asteroid's shadow [km/s]: 13.4861 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2327-01629-1 by 1227 Geranium on 2012 Nov 22 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 - 61 47 50 54 43 40 11 51 15 4 327 -1 - 63 38 41 56 5 42 - 58 54 10 52 8 18 - 67 39 20 58 30 39 ... .. .. .. .. .. - 65 30 36 58 58 49 11 51 22 9 324 -5 - 66 50 5 59 41 23 - 64 6 49 58 9 42 - 70 14 46 61 15 48 - 59 21 16 54 39 59 - 67 57 3 61 46 35 11 51 30 12 322 -7 - 69 9 56 62 17 43 - 66 42 47 61 12 22 - 72 24 40 63 30 33 - 63 7 25 59 16 18 - 69 57 15 64 2 57 11 51 37 14 320 -9 - 71 8 20 64 28 1 - 68 45 40 63 35 51 - 74 21 17 65 27 56 - 65 25 26 62 8 51 - 71 43 31 66 1 35 11 51 45 16 318 -11 - 72 54 52 66 22 43 - 70 32 6 65 38 55 - 76 10 11 67 13 43 - 67 15 23 64 27 44 - 73 21 21 67 48 29 11 51 52 18 317 -12 - 74 34 12 68 6 47 - 72 8 41 67 28 55 - 77 54 40 68 51 4 - 68 50 16 66 28 7 - 74 53 52 69 26 51 11 52 0 20 315 -13 - 76 9 8 69 42 58 - 73 38 57 69 9 39 - 79 36 57 70 21 53 - 70 15 34 68 16 21 - 76 23 7 70 58 42 11 52 7 21 313 -14 - 77 41 36 71 13 2 - 75 5 8 70 43 22 - 81 18 50 71 47 29 - 71 34 16 69 55 53 - 77 50 42 72 25 20 11 52 15 22 312 -15 - 79 13 11 72 38 11 - 76 28 51 72 11 34 - 83 1 53 73 8 46 - 72 48 12 71 28 46 - 79 17 59 73 47 42 11 52 22 24 310 -16 - 80 45 18 73 59 14 - 77 51 25 73 35 16 - 84 47 41 74 26 22 - 73 58 40 72 56 23 - 80 46 14 75 6 27 11 52 30 25 308 -17 - 82 19 19 75 16 49 - 79 14 2 74 55 13 - 86 37 53 75 40 48 - 75 6 40 74 19 42 - 82 16 50 76 22 8 11 52 37 26 306 -17 - 83 56 46 76 31 25 - 80 37 55 76 11 58 - 88 34 29 76 52 25 - 76 13 1 75 39 25 - 83 51 21 77 35 7 11 52 45 27 304 -18 - 85 39 27 77 43 23 - 82 4 23 77 25 57 - 90 39 52 78 1 30 - 77 18 28 76 56 6 - 85 31 42 78 45 44 11 52 52 28 302 -19 - 87 29 37 78 53 1 - 83 35 3 78 37 31 - 92 57 5 79 8 14 - 78 23 47 78 10 8 - 87 20 27 79 54 12 11 53 0 29 300 -19 - 89 30 17 80 0 30 - 85 12 1 79 46 55 - 95 30 15 80 12 44 - 79 29 49 79 21 53 - 89 21 7 81 0 42 11 53 7 29 298 -20 - 91 45 35 81 5 58 - 86 58 8 80 54 23 - 98 25 1 81 15 3 - 80 37 39 80 31 37 - 91 38 48 82 5 21 11 53 15 30 295 -20 - 94 21 35 82 9 31 - 88 57 32 82 0 2 -101 49 24 82 15 6 - 81 48 43 81 39 33 - 94 21 22 83 8 11 11 53 22 31 292 -20 - 97 27 28 83 11 6 - 91 16 33 83 3 58 -105 55 8 83 12 42 - 83 5 7 82 45 53 - 97 41 29 84 9 8 11 53 29 32 288 -21 -101 17 54 84 10 36 - 94 5 35 84 6 13 -110 59 49 84 7 26 - 84 30 14 83 50 45 -102 0 59 85 7 59 11 53 37 32 283 -21 -106 17 34 85 7 37 - 97 42 44 85 6 40 -117 30 6 84 58 30 - 86 9 59 84 54 17 -108 0 14 86 4 9 11 53 44 33 277 -21 -113 10 1 86 1 21 -102 42 37 86 4 58 -126 5 30 85 44 34 - 88 15 57 85 56 33 -116 59 3 86 56 19 11 53 52 33 268 -21 -123 14 26 86 50 3 -110 18 26 87 0 15 -137 38 3 86 23 14 - 91 14 29 86 57 33 -131 38 12 87 41 12 11 53 59 34 252 -22 -138 43 57 87 29 55 -123 21 15 87 50 2 -152 50 40 86 50 48 - 96 21 23 87 57 4 -155 58 0 88 10 57 11 54 7 34 228 -22 -161 41 9 87 53 36 -148 6 7 88 26 56 -171 9 42 87 2 48 -109 5 58 88 53 44 172 15 52 88 13 31 11 54 14 35 195 -22 171 25 17 87 52 48 173 32 54 88 34 22 170 8 48 86 56 50 -172 36 40 89 31 32 146 36 42 87 48 12 11 54 22 35 169 -22 149 21 6 87 28 42 142 54 35 88 7 28 154 8 55 86 34 59 121 20 26 88 55 56 131 0 30 87 7 27 11 54 29 36 153 -22 134 40 5 86 50 30 126 32 31 87 23 42 141 52 25 86 1 58 108 11 48 88 1 32 121 33 18 86 20 5 11 54 37 36 143 -22 125 6 58 86 5 21 117 28 17 86 33 58 132 45 52 85 22 3 103 1 40 87 5 39 115 21 10 85 29 51 11 54 44 37 136 -22 118 34 58 85 16 50 111 46 58 85 42 1 125 56 6 84 38 1 100 4 30 86 9 45 110 56 56 84 38 18 11 54 52 37 131 -22 113 50 15 84 26 38 107 49 44 84 49 12 120 40 31 83 51 29 98 2 5 85 14 7 107 36 55 83 46 9 11 54 59 37 127 -22 110 12 12 83 35 33 104 51 44 83 56 3 116 29 59 83 3 26 96 27 25 84 18 49 104 57 43 82 53 44 11 55 7 37 124 -22 107 17 46 82 44 0 102 30 19 83 2 50 113 5 16 82 14 27 95 8 45 83 23 51 102 45 54 82 1 15 11 55 14 38 121 -22 104 53 10 81 52 14 100 32 59 82 9 39 110 13 40 81 24 52 94 0 10 82 29 13 100 53 15 81 8 45 11 55 22 38 118 -22 102 49 47 81 0 22 98 52 16 81 16 35 107 46 33 80 34 53 92 58 21 81 34 52 99 14 32 80 16 19 11 55 29 38 116 -22 101 1 58 80 8 30 97 23 31 80 23 39 105 37 59 79 44 40 92 1 17 80 40 47 97 46 14 79 23 58 11 55 36 38 114 -22 99 25 53 79 16 38 96 3 38 79 30 50 103 43 43 78 54 17 91 7 40 79 46 57 96 25 54 78 31 42 11 55 44 38 112 -22 97 58 51 78 24 48 94 50 29 78 38 9 102 0 43 78 3 48 90 16 38 78 53 19 95 11 48 77 39 31 11 55 51 38 110 -21 96 38 55 77 33 2 93 42 34 77 45 35 100 26 42 77 13 15 89 27 34 77 59 52 94 2 37 76 47 24 11 55 59 38 108 -21 95 24 38 76 41 17 92 38 48 76 53 7 98 59 57 76 22 38 88 40 3 77 6 34 92 57 25 75 55 21 11 56 6 38 106 -21 94 14 56 75 49 35 91 38 19 76 0 44 97 39 8 75 31 58 87 53 42 76 13 24 91 55 26 75 3 20 11 56 14 38 105 -21 93 8 58 74 57 54 90 40 31 75 8 24 96 23 13 74 41 16 87 8 17 75 20 18 90 56 5 74 11 20 11 56 21 38 103 -20 92 6 4 74 6 12 89 44 53 74 16 6 95 11 23 73 50 30 86 23 37 74 27 17 89 58 55 73 19 19 11 56 29 38 101 -20 91 5 43 73 14 30 88 51 2 73 23 49 94 2 59 72 59 41 85 39 29 73 34 17 89 3 33 72 27 18 11 56 36 38 100 -20 90 7 29 72 22 46 87 58 38 72 31 30 92 57 27 72 8 48 84 55 48 72 41 18 88 9 40 71 35 13 11 56 44 38 98 -19 89 11 0 71 30 58 87 7 27 71 39 10 91 54 21 71 17 49 84 12 24 71 48 16 87 17 1 70 43 5 11 56 51 38 97 -19 88 16 0 70 39 6 86 17 13 70 46 45 90 53 19 70 26 44 83 29 13 70 55 12 86 25 23 69 50 50 11 56 59 38 95 -19 87 22 13 69 47 7 85 27 47 69 54 15 89 54 2 69 35 31 82 46 9 70 2 2 85 34 33 68 58 27 11 57 6 38 94 -18 86 29 27 68 55 0 84 38 57 69 1 37 88 56 13 68 44 9 82 3 6 69 8 44 84 44 23 68 5 56 11 57 14 37 92 -18 85 37 30 68 2 44 83 50 37 68 8 50 87 59 39 67 52 37 81 20 1 68 15 18 83 54 43 67 13 13 11 57 21 37 91 -17 84 46 12 67 10 17 83 2 37 67 15 52 87 4 7 67 0 54 80 36 50 67 21 41 83 5 25 66 20 17 11 57 29 37 90 -17 83 55 25 66 17 36 82 14 52 66 22 41 86 9 26 66 8 56 79 53 27 66 27 50 82 16 23 65 27 6 11 57 36 36 88 -16 83 5 0 65 24 41 81 27 14 65 29 15 85 15 26 65 16 44 79 9 49 65 33 43 81 27 29 64 33 38 11 57 43 36 87 -16 82 14 51 64 31 28 80 39 37 64 35 32 84 21 59 64 24 15 78 25 53 64 39 18 80 38 38 63 39 50 11 57 51 36 86 -15 81 24 50 63 37 56 79 51 57 63 41 29 83 28 56 63 31 27 77 41 33 63 44 33 79 49 43 62 45 41 11 57 58 35 84 -15 80 34 51 62 44 3 79 4 6 62 47 3 82 36 9 62 38 17 76 56 46 62 49 25 79 0 38 61 51 7 11 58 6 35 83 -14 79 44 48 61 49 45 78 16 0 61 52 13 81 43 32 61 44 44 76 11 28 61 53 50 78 11 17 60 56 6 11 58 13 34 82 -13 78 54 34 60 55 1 77 27 34 60 56 55 80 50 57 60 50 46 75 25 34 60 57 46 77 21 34 60 0 34 11 58 21 34 80 -13 78 4 3 59 59 46 76 38 40 60 1 6 79 58 17 59 56 18 74 38 59 60 1 10 76 31 24 59 4 29 11 58 28 33 79 -12 77 13 8 59 3 59 75 49 14 59 4 43 79 5 26 59 1 19 73 51 37 59 3 56 75 40 39 58 7 45 11 58 36 32 78 -11 76 21 44 58 7 34 74 59 10 58 7 41 78 12 16 58 5 44 73 3 24 58 6 2 74 49 13 57 10 20 11 58 43 32 77 -11 75 29 43 57 10 29 74 8 19 57 9 56 77 18 41 57 9 31 72 14 11 57 7 21 73 56 59 56 12 9 11 58 51 31 76 -10 74 36 58 56 12 38 73 16 36 56 11 24 76 24 33 56 12 35 71 23 53 56 7 50 73 3 49 55 13 6 11 58 58 30 74 -9 73 43 21 55 13 56 72 23 52 55 11 58 75 29 44 55 14 51 70 32 21 55 7 21 72 9 33 54 13 5 11 59 6 30 73 -8 72 48 44 54 14 18 71 29 58 54 11 34 74 34 5 54 16 15 69 39 26 54 5 49 71 14 2 53 11 59 11 59 13 29 72 -7 71 52 55 53 13 38 70 34 44 53 10 2 73 37 27 53 16 40 68 44 55 53 3 3 70 17 4 52 9 40 11 59 21 28 71 -6 70 55 45 52 11 46 69 37 58 52 7 16 72 39 40 52 15 59 67 48 38 51 58 56 69 18 25 51 5 59 11 59 28 27 70 -5 69 56 59 51 8 35 68 39 26 51 3 4 71 40 32 51 14 4 66 50 17 50 53 14 68 17 51 50 0 45 11 59 36 26 68 -4 68 56 24 50 3 53 67 38 51 49 57 15 70 39 48 50 10 47 65 49 35 49 45 45 67 15 1 48 53 42 11 59 43 25 67 -3 67 53 40 48 57 27 66 35 54 48 49 34 69 37 13 49 5 55 64 46 7 48 36 11 66 9 33 47 44 35 11 59 50 24 66 -2 66 48 26 47 49 2 65 30 10 47 39 44 68 32 28 47 59 15 63 39 25 47 24 10 65 0 57 46 33 2 11 59 58 23 65 -1 65 40 14 46 38 17 64 21 7 46 27 21 67 25 9 46 50 30 62 28 49 46 9 13 Uncertainty in time = +/- 6 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 2327-01629-1 * constellation : Triangulum * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 30 29.0469 DE: +33 18 30.013 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .018 ) * V mag [mag]: 8.9 * B mag [mag]: 9.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1227) Geranium approx. diameter [km]: 46 approx. diameter ["]: .027 distance from Earth [AU]: 2.39100 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 913 number of rejected observations: 30 time covered by the observations: 1931 Oct 05 - 2012 Oct 16 1 sigma uncertainty ellipse (major, minor, PA): 0.047, 0.031, 52° remarks: * orbital elements for (1227) Geranium : Mean anomaly = 88.67172400 deg Arg. of pericenter = 300.07007261 deg Long. of node = 1.54642419 deg Inclination = 16.40644825 deg Eccentricity = 0.18893103 Semimajor axis = 3.22568219 AU Perihelion dist = 2.61625073 AU Mag: H = 10.67, G = 0.15 Epoch of elements : MJD 56253.49700000 TDT (2012 Nov 22.497) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 22 1227 Geranium 11h 56.1m UT 8.9 2 30 29.047 33 18 30.01TYC 2327-01629-1 9.1 15.7 46 3.4 2.391 -2.141 -7.94 156.7196 33.311 -2.46 -20.27 11.9351 -0.21925 0.74830 -7.29991 -2.15696 0.00201 -0.00115 2000 88.07679220121119.00000300.070073 1.546424 16.4064480.18893103 3.2256822 2.616250710.7 5.00.15 RATE 1.7012640 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.049 0.035 56 2.37 0.036 0 0-1 3 056247.0020121122_1629-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org