IOTA/IOTA-ES occultation update for (637) Chrysothemis / TYC 1864-00538-1 event on 2012 Oct 17, 12:24 UT Visible from SW Canada Summary ------- On 2012 Oct 17 UT, the 23 km diameter asteroid (637) Chrysothemis will occult a 11.7 mag star in the constellation Gemini for observers along a path across SW Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 16.5 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: 21 * date and approx. time of event: 2012 Oct 17, 12:01 - 2012 Oct 17, 12:32 UT * geocentric midpoint of event [JD]: 2456218.01659583 * magnitude of target star: 11.7 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 5.4 * Moon: 6 % sunlit, 141° distance * Sun: 113° distance * rough path description: SW Canada The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 3.13 * 1 sigma uncertainty interval [seconds]: +/- 17.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .038", 90° ) * approx speed of asteroid's shadow [km/s]: 4.3529 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1864-00538-1 by 637 Chrysothemis on 2012 Oct 17 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 ' " Latitude Latitude Latitude Latitude 145 0 0 22 41 18 12 1 57 1 65 -58 22 33 27 22 49 9 .. .. .. 23 38 35 146 0 0 23 8 27 12 1 58 2 65 -58 23 0 36 23 16 20 .. .. .. 24 5 50 147 0 0 23 35 43 12 1 59 3 65 -59 23 27 50 23 43 35 .. .. .. 24 33 9 148 0 0 24 3 3 12 2 1 4 66 -60 23 55 10 24 10 56 .. .. .. 25 0 33 149 0 0 24 30 27 12 2 4 5 66 -60 24 22 33 24 38 21 .. .. .. 25 28 1 150 0 0 24 57 54 12 2 7 6 67 -61 24 50 0 25 5 48 24 0 49 25 55 32 151 0 0 25 25 24 12 2 10 7 67 -62 25 17 29 25 33 18 24 28 15 26 23 5 152 0 0 25 52 55 12 2 14 8 68 -62 25 45 0 26 0 50 24 55 43 26 50 39 153 0 0 26 20 27 12 2 18 9 68 -63 26 12 32 26 28 22 25 23 13 27 18 14 154 0 0 26 47 59 12 2 23 10 68 -63 26 40 4 26 55 55 25 50 43 27 45 48 155 0 0 27 15 30 12 2 29 11 69 -64 27 7 34 27 23 26 26 18 12 28 13 21 156 0 0 27 42 59 12 2 35 12 69 -64 27 35 4 27 50 56 26 45 40 28 40 52 157 0 0 28 10 26 12 2 41 13 70 -64 28 2 30 28 18 23 27 13 5 29 8 20 158 0 0 28 37 50 12 2 48 14 70 -65 28 29 54 28 45 46 27 40 28 29 35 44 159 0 0 29 5 9 12 2 55 15 71 -65 28 57 13 29 13 6 28 7 47 30 3 4 160 0 0 29 32 23 12 3 3 16 72 -65 29 24 27 29 40 20 28 35 1 30 30 18 161 0 0 29 59 32 12 3 11 17 72 -65 29 51 36 30 7 29 29 2 10 30 57 26 162 0 0 30 26 34 12 3 20 18 73 -66 30 18 38 30 34 30 29 29 13 31 24 27 163 0 0 30 53 28 12 3 29 19 73 -66 30 45 33 31 1 25 29 56 8 31 51 21 164 0 0 31 20 15 12 3 39 20 74 -66 31 12 19 31 28 11 30 22 56 32 18 5 165 0 0 31 46 52 12 3 49 21 74 -66 31 38 56 31 54 48 30 49 35 32 44 41 166 0 0 32 13 19 12 3 59 22 75 -66 32 5 24 32 21 15 31 16 4 33 11 6 167 0 0 32 39 36 12 4 10 23 76 -66 32 31 41 32 47 31 31 42 24 33 37 20 168 0 0 33 5 41 12 4 21 24 76 -66 32 57 47 33 13 36 32 8 32 34 3 22 169 0 0 33 31 35 12 4 32 25 77 -65 33 23 41 33 39 29 32 34 29 34 29 12 170 0 0 33 57 16 12 4 44 26 78 -65 33 49 22 34 5 9 33 0 13 34 54 49 171 0 0 34 22 43 12 4 57 27 78 -65 34 14 50 34 30 36 33 25 44 35 20 13 172 0 0 34 47 56 12 5 9 28 79 -65 34 40 4 34 55 49 33 51 2 35 45 21 173 0 0 35 12 55 12 5 22 29 80 -64 35 5 3 35 20 47 34 16 5 36 10 15 174 0 0 35 37 38 12 5 35 30 81 -64 35 29 47 35 45 29 34 40 53 36 34 53 175 0 0 36 2 5 12 5 49 31 81 -64 35 54 15 36 9 55 35 5 25 36 59 15 176 0 0 36 26 15 12 6 3 31 82 -63 36 18 26 36 34 5 35 29 41 37 23 20 177 0 0 36 50 9 12 6 17 32 83 -63 36 42 20 36 57 58 35 53 41 37 47 7 178 0 0 37 13 45 12 6 31 33 84 -62 37 5 57 37 21 33 36 17 23 38 10 37 179 0 0 37 37 3 12 6 46 34 85 -62 37 29 16 37 44 50 36 40 47 38 33 48 180 0 0 38 0 2 12 7 1 35 86 -61 37 52 16 38 7 48 37 3 53 38 56 40 -179 0 0 38 22 42 12 7 16 36 86 -61 38 14 57 38 30 27 37 26 40 39 19 13 -178 0 0 38 45 3 12 7 31 37 87 -60 38 37 19 38 52 47 37 49 7 39 41 26 -177 0 0 39 7 3 12 7 47 38 88 -59 38 59 20 39 14 47 38 11 15 40 3 20 -176 0 0 39 28 44 12 8 3 38 89 -59 39 21 2 39 36 26 38 33 3 40 24 52 -175 0 0 39 50 4 12 8 19 39 90 -58 39 42 23 39 57 45 38 54 31 40 46 4 -174 0 0 40 11 3 12 8 35 40 91 -58 40 3 23 40 18 43 39 15 38 41 6 55 -173 0 0 40 31 40 12 8 51 41 92 -57 40 24 2 40 39 19 39 36 24 41 27 25 -172 0 0 40 51 57 12 9 8 42 93 -56 40 44 19 40 59 35 39 56 48 41 47 33 -171 0 0 41 11 51 12 9 24 42 94 -56 41 4 15 41 19 28 40 16 51 42 7 19 -170 0 0 41 31 24 12 9 41 43 95 -55 41 23 49 41 38 59 40 36 32 42 26 43 -169 0 0 41 50 34 12 9 58 44 96 -54 41 43 0 41 58 9 40 55 50 42 45 45 -168 0 0 42 9 22 12 10 15 45 97 -54 42 1 50 42 16 55 41 14 47 43 4 24 -167 0 0 42 27 48 12 10 32 45 99 -53 42 20 16 42 35 20 41 33 21 43 22 41 -166 0 0 42 45 50 12 10 49 46 100 -52 42 38 20 42 53 21 41 51 32 43 40 35 -165 0 0 43 3 30 12 11 7 47 101 -52 42 56 1 43 11 0 42 9 21 43 58 6 -164 0 0 43 20 48 12 11 24 48 102 -51 43 13 20 43 28 16 42 26 47 44 15 14 -163 0 0 43 37 42 12 11 42 48 103 -50 43 30 15 43 45 9 42 43 49 44 31 59 -162 0 0 43 54 13 12 11 59 49 105 -50 43 46 47 44 1 39 43 0 29 44 48 21 -161 0 0 44 10 20 12 12 17 50 106 -49 44 2 56 44 17 45 43 16 46 45 4 20 -160 0 0 44 26 5 12 12 34 50 107 -48 44 18 42 44 33 29 43 32 39 45 19 56 -159 0 0 44 41 27 12 12 52 51 109 -47 44 34 5 44 48 49 43 48 9 45 35 9 -158 0 0 44 56 25 12 13 10 52 110 -47 44 49 4 45 3 46 44 3 16 45 49 58 -157 0 0 45 11 0 12 13 28 52 111 -46 45 3 40 45 18 20 44 17 59 46 4 25 -156 0 0 45 25 12 12 13 46 53 113 -45 45 17 53 45 32 30 44 32 19 46 18 28 -155 0 0 45 39 0 12 14 4 53 114 -45 45 31 43 45 46 18 44 46 16 46 32 8 -154 0 0 45 52 26 12 14 22 54 116 -44 45 45 9 45 59 42 44 59 49 46 45 26 -153 0 0 46 5 28 12 14 40 55 117 -43 45 58 13 46 12 43 45 12 59 46 58 20 -152 0 0 46 18 7 12 14 58 55 119 -42 46 10 53 46 25 21 45 25 46 47 10 51 -151 0 0 46 30 23 12 15 16 56 120 -42 46 23 10 46 37 36 45 38 10 47 22 59 -150 0 0 46 42 16 12 15 34 56 122 -41 46 35 4 46 49 28 45 50 11 47 34 44 -149 0 0 46 53 46 12 15 52 57 123 -40 46 46 35 47 0 57 46 1 48 47 46 7 -148 0 0 47 4 53 12 16 10 57 125 -40 46 57 44 47 12 3 46 13 3 47 57 7 -147 0 0 47 15 38 12 16 28 58 127 -39 47 8 29 47 22 47 46 23 54 48 7 44 -146 0 0 47 25 59 12 16 46 58 129 -38 47 18 52 47 33 8 46 34 23 48 17 58 -145 0 0 47 35 58 12 17 4 59 130 -38 47 28 52 47 43 6 46 44 29 48 27 51 -144 0 0 47 45 35 12 17 22 59 132 -37 47 38 29 47 52 41 46 54 12 48 37 20 -143 0 0 47 54 49 12 17 40 59 134 -36 47 47 44 48 1 54 47 3 32 48 46 28 -142 0 0 48 3 40 12 17 59 60 136 -35 47 56 36 48 10 45 47 12 29 48 55 13 -141 0 0 48 12 9 12 18 17 60 138 -35 48 5 6 48 19 13 47 21 5 49 3 36 -140 0 0 48 20 16 12 18 35 61 140 -34 48 13 14 48 27 19 47 29 17 49 11 38 -139 0 0 48 28 1 12 18 53 61 142 -33 48 20 59 48 35 3 47 37 7 49 19 17 -138 0 0 48 35 24 12 19 11 61 143 -33 48 28 23 48 42 25 47 44 35 49 26 34 -137 0 0 48 42 24 12 19 29 62 145 -32 48 35 24 48 49 25 47 51 41 49 33 30 -136 0 0 48 49 3 12 19 47 62 148 -31 48 42 3 48 56 3 47 58 24 49 40 4 -135 0 0 48 55 20 12 20 5 62 150 -31 48 48 21 49 2 20 48 4 46 49 46 16 -134 0 0 49 1 15 12 20 23 62 152 -30 48 54 16 49 8 14 48 10 45 49 52 6 -133 0 0 49 6 48 12 20 41 63 154 -29 48 59 50 49 13 47 48 16 23 49 57 36 -132 0 0 49 12 0 12 20 59 63 156 -28 49 5 3 49 18 58 48 21 38 50 2 44 -131 0 0 49 16 50 12 21 17 63 158 -28 49 9 53 49 23 48 48 26 32 50 7 30 -130 0 0 49 21 19 12 21 35 63 160 -27 49 14 22 49 28 16 48 31 4 50 11 55 -129 0 0 49 25 26 12 21 53 63 163 -26 49 18 30 49 32 23 48 35 14 50 15 59 -128 0 0 49 29 12 12 22 11 64 165 -26 49 22 16 49 36 8 48 39 2 50 19 42 -127 0 0 49 32 36 12 22 28 64 167 -25 49 25 41 49 39 32 48 42 29 50 23 4 -126 0 0 49 35 39 12 22 46 64 169 -24 49 28 44 49 42 35 48 45 35 50 26 5 -125 0 0 49 38 21 12 23 4 64 171 -24 49 31 26 49 45 16 48 48 19 50 28 45 -124 0 0 49 40 42 12 23 22 64 174 -23 49 33 47 49 47 37 48 50 41 50 31 4 -123 0 0 49 42 41 12 23 40 64 176 -22 49 35 47 49 49 36 48 52 42 50 33 2 -122 0 0 49 44 20 12 23 58 64 178 -22 49 37 26 49 51 14 48 54 21 50 34 39 -121 0 0 49 45 37 12 24 15 64 181 -21 49 38 43 49 52 31 48 55 40 50 35 55 -120 0 0 49 46 33 12 24 33 64 183 -20 49 39 39 49 53 27 48 56 36 50 36 51 -119 0 0 49 47 8 12 24 51 64 185 -20 49 40 14 49 54 2 48 57 12 50 37 25 -118 0 0 49 47 22 12 25 9 64 187 -19 49 40 28 49 54 16 48 57 26 50 37 39 -117 0 0 49 47 15 12 25 26 64 190 -18 49 40 21 49 54 9 48 57 19 50 37 32 -116 0 0 49 46 47 12 25 44 64 192 -17 49 39 53 49 53 41 48 56 50 50 37 4 -115 0 0 49 45 57 12 26 2 63 194 -17 49 39 3 49 52 52 48 56 0 50 36 16 -114 0 0 49 44 47 12 26 20 63 196 -16 49 37 53 49 51 42 48 54 49 50 35 6 -113 0 0 49 43 16 12 26 37 63 198 -15 49 36 21 49 50 10 48 53 16 50 33 36 -112 0 0 49 41 23 12 26 55 63 200 -15 49 34 29 49 48 18 48 51 22 50 31 45 -111 0 0 49 39 10 12 27 13 63 203 -14 49 32 15 49 46 5 48 49 7 50 29 33 -110 0 0 49 36 35 12 27 30 62 205 -13 49 29 40 49 43 30 48 46 30 50 27 0 -109 0 0 49 33 39 12 27 48 62 207 -13 49 26 43 49 40 35 48 43 32 50 24 7 -108 0 0 49 30 22 12 28 5 62 209 -12 49 23 26 49 37 18 48 40 12 50 20 52 -107 0 0 49 26 43 12 28 23 62 211 -11 49 19 47 49 33 40 48 36 31 50 17 16 -106 0 0 49 22 43 12 28 41 61 213 -11 49 15 47 49 29 40 48 32 28 50 13 20 -105 0 0 49 18 22 12 28 58 61 215 -10 49 11 25 49 25 20 48 28 4 50 9 2 -104 0 0 49 13 40 12 29 16 61 217 -9 49 6 42 49 20 38 48 23 18 50 4 23 -103 0 0 49 8 36 12 29 33 60 219 -8 49 1 38 49 15 34 48 18 10 49 59 23 -102 0 0 49 3 10 12 29 51 60 220 -8 48 56 12 49 10 9 48 12 40 49 54 2 -101 0 0 48 57 23 12 30 8 60 222 -7 48 50 24 49 4 23 48 6 49 49 48 19 -100 0 0 48 51 15 12 30 26 59 224 -6 48 44 15 48 58 15 48 0 36 49 42 15 - 99 0 0 48 44 44 12 30 43 59 226 -6 48 37 44 48 51 45 47 54 1 49 35 49 - 98 0 0 48 37 52 12 31 1 58 228 -5 48 30 51 48 44 54 47 47 4 49 29 2 - 97 0 0 48 30 38 12 31 18 58 229 -4 48 23 36 48 37 40 47 39 45 49 21 54 - 96 0 0 48 23 2 12 31 36 57 231 -3 48 16 0 48 30 5 47 32 3 49 14 23 - 95 0 0 48 15 4 12 31 53 57 233 -3 48 8 1 48 22 8 47 24 0 49 6 31 - 94 0 0 48 6 45 12 32 10 56 234 -2 47 59 40 48 13 49 47 15 34 48 58 17 - 93 0 0 47 58 3 12 32 28 56 236 -1 47 50 58 48 5 8 47 6 46 48 49 41 - 92 0 0 47 48 58 12 32 45 55 237 0 47 41 52 47 56 5 46 57 36 48 40 44 Uncertainty in time = +/- 19 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 1864-00538-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 04 07.0502 DE: +23 45 28.046 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .028 ) * V mag [mag]: 11.7 * B mag [mag]: 11.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (637) Chrysothemis approx. diameter [km]: 23 approx. diameter ["]: .012 distance from Earth [AU]: 2.60500 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1453 number of rejected observations: 33 time covered by the observations: 1907 Mar 21 - 2012 Sep 19 1 sigma uncertainty ellipse (major, minor, PA): 0.038, 0.025, 90° remarks: * orbital elements for (637) Chrysothemis : Mean anomaly = 283.24461690 deg Arg. of pericenter = 171.38805065 deg Long. of node = 353.83523947 deg Inclination = 0.27132308 deg Eccentricity = 0.12640695 Semimajor axis = 3.17875141 AU Perihelion dist = 2.77693514 AU Mag: H = 11.49, G = 0.15 Epoch of elements : MJD 56217.51700000 TDT (2012 Oct 17.517) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 17 637 Chrysothemis 12h 23.9m UT 11.7 6 4 7.050 23 45 28.05TYC 1864-00538-1 11.8 16.5 23 5.4 2.605 0.603 0.21 -121.3562 23.758 -9.65 -9.51 12.3983 -0.01192 0.43425 2.45611 0.06295 -0.00541 0.00003 2000 281.93735220121010.00000171.388051353.835239 0.2713230.12640695 3.1787514 2.776935111.0 5.00.15 RATE 1.7390780 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.038 90 4.13 0.038 0 0 2-4 056208.0020121017_0538-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 18:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org