IOTA/IOTA-ES occultation update for (4440) Tchantches / TYC 6272-01843-1 event on 2007 Aug 01, 09:26 UT Visible from Hawaii Summary ------- On 2007 Aug 01 UT, the 11 km diameter asteroid (4440) Tchantches will occult a 9.8 mag star in the constellation Sagittarius for observers along a path across Hawaii. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 15.0 mag (the magnitude of the asteroid) for at most 1.3 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: 7 * date and approx. time of event: 2007 Aug 01, 09:16 - 2007 Aug 01, 09:35 UT * midpoint of event [JD]: 2454313.89307917 * magnitude of target star: 9.8 * magnitude drop [mag]: 5.2 * estimated maximum duration [s]: 1.3 * Moon: 93 % sunlit, 67° distance * Sun: 143° distance * rough path description: Hawaii The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 9.44 * 1 sigma uncertainty interval [seconds]: +/- 7.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .121 +/- .082) * 1 sigma uncertainty ellipse (major, minor, PA): ( .128", .072", 68° ) * approx speed of asteroid's shadow [km/s]: 8.2680 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6272-01843-1 by 4440 Tchantches on 2007 Aug 01 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 -167 40 53 70 0 0 9 35 8 1 193 0 -167 28 16 -167 53 28 -163 24 52 ... .. .. -168 15 4 69 0 0 9 35 7 2 192 -1 -168 3 5 -168 27 2 -164 12 17 ... .. .. -168 43 14 68 0 0 9 35 7 3 192 -2 -168 31 49 -168 54 38 -164 52 9 ... .. .. -169 6 11 67 0 0 9 35 6 4 191 -3 -168 55 16 -169 17 5 -165 25 31 ... .. .. -169 24 35 66 0 0 9 35 4 5 191 -4 -169 14 7 -169 35 2 -165 53 16 ... .. .. -169 38 58 65 0 0 9 35 3 6 191 -4 -169 28 55 -169 49 1 -166 16 5 ... .. .. -169 49 49 64 0 0 9 35 1 7 191 -5 -169 40 8 -169 59 29 -166 34 33 ... .. .. -169 57 30 63 0 0 9 34 59 8 190 -6 -169 48 9 -170 6 50 -166 49 10 -173 0 53 -170 2 20 62 0 0 9 34 56 9 190 -7 -169 53 17 -170 11 21 -167 0 20 -172 59 43 -170 4 35 61 0 0 9 34 53 10 190 -8 -169 55 50 -170 13 20 -167 8 24 -172 56 28 -170 4 31 60 0 0 9 34 50 11 190 -9 -169 56 1 -170 13 0 -167 13 40 -172 51 19 -170 2 18 59 0 0 9 34 46 12 190 -10 -169 54 3 -170 10 33 -167 16 22 -172 44 25 -169 58 8 58 0 0 9 34 42 12 191 -11 -169 50 6 -170 6 9 -167 16 44 -172 35 55 -169 52 9 57 0 0 9 34 38 13 191 -12 -169 44 20 -169 59 58 -167 14 57 -172 25 54 -169 44 29 56 0 0 9 34 34 14 191 -12 -169 36 51 -169 52 6 -167 11 11 -172 14 30 -169 35 16 55 0 0 9 34 29 15 191 -13 -169 27 48 -169 42 42 -167 5 33 -172 1 48 -169 24 34 54 0 0 9 34 23 16 191 -14 -169 17 17 -169 31 50 -166 58 13 -171 47 52 -169 12 29 53 0 0 9 34 18 17 191 -15 -169 5 21 -169 19 37 -166 49 16 -171 32 47 -168 59 6 52 0 0 9 34 12 18 192 -16 -168 52 7 -169 6 5 -166 38 48 -171 16 35 -168 44 30 51 0 0 9 34 6 19 192 -17 -168 37 38 -168 51 20 -166 26 53 -170 59 21 -168 28 42 50 0 0 9 34 0 20 192 -18 -168 21 58 -168 35 25 -166 13 37 -170 41 6 -168 11 46 49 0 0 9 33 53 21 193 -19 -168 5 10 -168 18 23 -165 59 3 -170 21 53 -167 53 46 48 0 0 9 33 46 22 193 -20 -167 47 16 -168 0 16 -165 43 15 -170 1 44 -167 34 43 47 0 0 9 33 39 23 193 -21 -167 28 19 -167 41 7 -165 26 15 -169 40 41 -167 14 39 46 0 0 9 33 31 24 194 -22 -167 8 21 -167 20 57 -165 8 6 -169 18 45 -166 53 37 45 0 0 9 33 23 25 194 -23 -166 47 24 -166 59 49 -164 48 50 -168 55 58 -166 31 37 44 0 0 9 33 15 26 195 -24 -166 25 28 -166 37 44 -164 28 29 -168 32 21 -166 8 40 43 0 0 9 33 6 27 195 -25 -166 2 37 -166 14 43 -164 7 5 -168 7 54 -165 44 49 42 0 0 9 32 57 28 196 -26 -165 38 50 -165 50 48 -163 44 40 -167 42 38 -165 20 3 41 0 0 9 32 48 28 196 -27 -165 14 8 -165 25 58 -163 21 13 -167 16 34 -164 54 23 40 0 0 9 32 39 29 197 -28 -164 48 32 -165 0 15 -162 56 47 -166 49 42 -164 27 51 39 0 0 9 32 29 30 197 -29 -164 22 3 -164 33 39 -162 31 22 -166 22 2 -164 0 25 38 0 0 9 32 19 31 198 -30 -163 54 40 -164 6 10 -162 4 58 -165 53 35 -163 32 6 37 0 0 9 32 8 32 199 -31 -163 26 24 -163 37 48 -161 37 36 -165 24 20 -163 2 55 36 0 0 9 31 58 33 199 -32 -162 57 15 -163 8 34 -161 9 16 -164 54 18 -162 32 51 35 0 0 9 31 47 34 200 -33 -162 27 13 -162 38 28 -160 39 57 -164 23 27 -162 1 53 34 0 0 9 31 35 34 201 -34 -161 56 18 -162 7 28 -160 9 40 -163 51 47 -161 30 2 33 0 0 9 31 24 35 201 -36 -161 24 28 -161 35 35 -159 38 25 -163 19 19 -160 57 16 32 0 0 9 31 12 36 202 -37 -160 51 44 -161 2 47 -159 6 10 -162 46 1 -160 23 35 31 0 0 9 31 0 37 203 -38 -160 18 4 -160 29 5 -158 32 55 -162 11 52 -159 48 57 30 0 0 9 30 47 37 204 -39 -159 43 28 -159 54 26 -157 58 40 -161 36 52 -159 13 23 29 0 0 9 30 35 38 205 -40 -159 7 55 -159 18 51 -157 23 22 -161 0 59 -158 36 50 28 0 0 9 30 22 39 206 -41 -158 31 23 -158 42 18 -156 47 1 -160 24 12 -157 59 18 27 0 0 9 30 8 39 207 -42 -157 53 51 -158 4 45 -156 9 36 -159 46 30 -157 20 44 26 0 0 9 29 55 40 208 -43 -157 15 17 -157 26 11 -155 31 4 -159 7 51 -156 41 7 25 0 0 9 29 41 41 209 -44 -156 35 40 -156 46 34 -154 51 23 -158 28 14 -156 0 25 24 0 0 9 29 27 41 210 -45 -155 54 57 -156 5 52 -154 10 33 -157 47 37 -155 18 35 23 0 0 9 29 12 42 211 -47 -155 13 7 -155 24 3 -153 28 30 -157 5 57 -154 35 36 22 0 0 9 28 57 42 212 -48 -154 30 7 -154 41 5 -152 45 11 -156 23 12 -153 51 24 21 0 0 9 28 42 43 214 -49 -153 45 54 -153 56 54 -152 0 34 -155 39 21 -153 5 57 20 0 0 9 28 27 43 215 -50 -153 0 25 -153 11 28 -151 14 35 -154 54 19 -152 19 11 19 0 0 9 28 11 44 216 -51 -152 13 38 -152 24 44 -150 27 11 -154 8 5 -151 31 2 18 0 0 9 27 55 44 218 -52 -151 25 27 -151 36 37 -149 38 17 -153 20 34 -150 41 27 17 0 0 9 27 39 44 219 -54 -150 35 49 -150 47 5 -148 47 49 -152 31 43 -149 50 21 16 0 0 9 27 23 45 220 -55 -149 44 40 -149 56 1 -147 55 43 -151 41 29 -148 57 39 15 0 0 9 27 6 45 222 -56 -148 51 55 -149 3 22 -147 1 51 -150 49 46 -148 3 14 14 0 0 9 26 49 45 223 -57 -147 57 27 -148 9 1 -146 6 8 -149 56 29 -147 7 2 13 0 0 9 26 31 45 225 -58 -147 1 10 -147 12 53 -145 8 26 -149 1 33 -146 8 54 12 0 0 9 26 13 45 226 -59 -146 2 58 -146 14 50 -144 8 38 -148 4 52 -145 8 44 11 0 0 9 25 55 45 228 -61 -145 2 42 -145 14 45 -143 6 33 -147 6 19 -144 6 20 10 0 0 9 25 37 45 229 -62 -144 0 13 -144 12 27 -142 2 0 -146 5 46 -143 1 34 9 0 0 9 25 18 45 231 -63 -142 55 20 -143 7 48 -140 54 49 -145 3 3 -141 54 13 8 0 0 9 24 59 45 233 -64 -141 47 51 -142 0 35 -139 44 42 -143 58 2 -140 44 3 7 0 0 9 24 39 45 234 -65 -140 37 33 -140 50 33 -138 31 25 -142 50 30 -139 30 49 6 0 0 9 24 19 44 236 -66 -139 24 8 -139 37 28 -137 14 35 -141 40 14 -138 14 9 5 0 0 9 23 59 44 237 -67 -138 7 17 -138 21 0 -135 53 50 -140 26 58 -136 53 42 4 0 0 9 23 38 43 239 -68 -136 46 37 -137 0 46 -134 28 38 -139 10 24 -135 29 0 3 0 0 9 23 17 43 240 -69 -135 21 40 -135 36 19 -132 58 22 -137 50 10 -133 59 28 2 0 0 9 22 55 42 242 -69 -133 51 50 -134 7 4 -131 22 16 -136 25 50 -132 24 22 1 0 0 9 22 32 41 243 -70 -132 16 24 -132 32 19 -129 39 18 -134 56 51 -130 42 48 0 0 0 9 22 9 40 245 -70 -130 34 24 -130 51 9 -127 48 5 -133 22 33 -128 53 29 - 1 0 0 9 21 45 39 246 -70 -128 44 35 -129 2 21 -125 46 40 -131 42 4 Latitude Latitude Latitude Latitude -128 0 0 - 1 27 41 9 21 34 38 247 -70 - 1 23 2 - 1 32 20 0 6 12 - 2 58 52 -127 0 0 - 1 57 28 9 21 21 38 247 -70 - 1 52 51 - 2 2 4 - 0 24 26 - 3 27 51 -126 0 0 - 2 25 54 9 21 9 37 248 -70 - 2 21 20 - 2 30 28 - 0 53 41 - 3 55 33 -125 0 0 - 2 53 2 9 20 57 36 248 -70 - 2 48 30 - 2 57 34 - 1 21 35 - 4 22 0 -124 0 0 - 3 18 53 9 20 46 36 249 -69 - 3 14 23 - 3 23 23 - 1 48 8 - 4 47 11 -123 0 0 - 3 43 28 9 20 34 35 249 -69 - 3 38 59 - 3 47 56 - 2 13 23 - 5 11 9 -122 0 0 - 4 6 47 9 20 23 34 250 -69 - 4 2 21 - 4 11 13 - 2 37 20 - 5 33 53 -121 0 0 - 4 28 53 9 20 13 33 250 -68 - 4 24 28 - 4 33 17 - 3 0 1 - 5 55 26 -120 0 0 - 4 49 45 9 20 2 33 250 -68 - 4 45 22 - 4 54 8 - 3 21 27 - 6 15 48 -119 0 0 - 5 9 26 9 19 52 32 251 -67 - 5 5 4 - 5 13 47 - 3 41 38 - 6 35 1 -118 0 0 - 5 27 55 9 19 42 31 251 -66 - 5 23 35 - 5 32 15 - 4 0 35 - 6 53 3 -117 0 0 - 5 45 14 9 19 33 30 251 -66 - 5 40 54 - 5 49 32 - 4 18 20 - 7 9 58 -116 0 0 - 6 1 22 9 19 23 29 251 -65 - 5 57 4 - 6 5 40 - 4 34 53 - 7 25 44 -115 0 0 - 6 16 22 9 19 14 29 252 -64 - 6 12 5 - 6 20 38 - 4 50 14 - 7 40 23 -114 0 0 - 6 30 13 9 19 6 28 252 -64 - 6 25 57 - 6 34 28 - 5 4 25 - 7 53 55 -113 0 0 - 6 42 55 9 18 57 27 252 -63 - 6 38 40 - 6 47 10 - 5 17 26 - 8 6 21 -112 0 0 - 6 54 31 9 18 49 26 252 -62 - 6 50 16 - 6 58 44 - 5 29 17 - 8 17 41 -111 0 0 - 7 4 59 9 18 41 25 252 -61 - 7 0 45 - 7 9 12 - 5 39 59 - 8 27 56 -110 0 0 - 7 14 20 9 18 33 24 252 -61 - 7 10 7 - 7 18 32 - 5 49 33 - 8 37 5 -109 0 0 - 7 22 34 9 18 26 23 252 -60 - 7 18 22 - 7 26 46 - 5 57 57 - 8 45 10 -108 0 0 - 7 29 42 9 18 19 23 252 -59 - 7 25 30 - 7 33 54 - 6 5 14 - 8 52 10 -107 0 0 - 7 35 44 9 18 12 22 252 -58 - 7 31 32 - 7 39 55 - 6 11 22 - 8 58 5 -106 0 0 - 7 40 39 9 18 5 21 252 -57 - 7 36 28 - 7 44 50 - 6 16 23 - 9 2 56 -105 0 0 - 7 44 29 9 17 59 20 252 -56 - 7 40 18 - 7 48 40 - 6 20 15 - 9 6 43 -104 0 0 - 7 47 12 9 17 53 19 252 -55 - 7 43 1 - 7 51 23 - 6 23 0 - 9 9 25 -103 0 0 - 7 48 50 9 17 47 18 252 -55 - 7 44 38 - 7 53 0 - 6 24 37 - 9 11 3 -102 0 0 - 7 49 20 9 17 41 17 252 -54 - 7 45 9 - 7 53 32 - 6 25 5 - 9 11 36 -101 0 0 - 7 48 45 9 17 36 16 252 -53 - 7 44 33 - 7 52 56 - 6 24 25 - 9 11 5 -100 0 0 - 7 47 2 9 17 31 15 252 -52 - 7 42 51 - 7 51 14 - 6 22 36 - 9 9 28 - 99 0 0 - 7 44 13 9 17 27 14 252 -51 - 7 40 1 - 7 48 25 - 6 19 38 - 9 6 46 - 98 0 0 - 7 40 16 9 17 22 13 252 -50 - 7 36 3 - 7 44 28 - 6 15 31 - 9 2 59 - 97 0 0 - 7 35 11 9 17 18 12 252 -49 - 7 30 57 - 7 39 24 - 6 10 13 - 8 58 5 - 96 0 0 - 7 28 57 9 17 14 11 252 -48 - 7 24 43 - 7 33 11 - 6 3 45 - 8 52 4 - 95 0 0 - 7 21 34 9 17 11 10 252 -47 - 7 17 19 - 7 25 49 - 5 56 6 - 8 44 57 - 94 0 0 - 7 13 2 9 17 7 9 252 -46 - 7 8 46 - 7 17 17 - 5 47 15 - 8 36 41 - 93 0 0 - 7 3 18 9 17 4 9 252 -45 - 6 59 1 - 7 7 35 - 5 37 11 - 8 27 17 - 92 0 0 - 6 52 24 9 17 2 8 252 -44 - 6 48 6 - 6 56 41 - 5 25 53 .. .. .. - 91 0 0 - 6 40 16 9 16 59 7 251 -43 - 6 35 57 - 6 44 35 - 5 13 21 .. .. .. - 90 0 0 - 6 26 56 9 16 57 6 251 -42 - 6 22 36 - 6 31 16 - 4 59 33 .. .. .. - 89 0 0 - 6 12 21 9 16 56 5 251 -41 - 6 7 59 - 6 16 42 - 4 44 28 .. .. .. - 88 0 0 - 5 56 30 9 16 54 3 251 -40 - 5 52 7 - 6 0 53 - 4 28 5 .. .. .. - 87 0 0 - 5 39 23 9 16 53 2 251 -39 - 5 34 58 - 5 43 48 - 4 10 22 .. .. .. - 86 0 0 - 5 20 57 9 16 53 1 251 -38 - 5 16 30 - 5 25 23 - 3 51 18 .. .. .. - 85 0 0 - 5 1 11 9 16 52 0 251 -37 - 4 56 42 .. .. .. .. .. .. .. .. .. Data for the target star ------------------------ * name: TYC 6272-01843-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 09 31.0986 DE: -19 07 02.220 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 9.8 * B mag [mag]: 10.0 * Apparent position with proper motion RA(deg): 272.4983016536 DE(deg): -19.1174731287 * Equation of equinoxes (radians) : 0.000033378739441 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4440) Tchantches approx. diameter [km]: 11 approx. diameter ["]: .013 distance from Earth [AU]: 1.12600 * orbital information: orbit source: Preston date of fit: 2007 Jul 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 463 number of rejected observations: 4 time covered by the observations: 1984 Dec 23 - 2007 Jun 19 1 sigma uncertainty ellipse (major, minor, PA): 0.126, 0.069, 67° remarks: * orbital elements for (4440) Tchantches : Mean anomaly = 135.88994978 deg Arg. of pericenter = 224.92532511 deg Long. of node = 283.40416547 deg Inclination = 21.35409746 deg Eccentricity = 0.07713017 Semimajor axis = 1.92123020 AU Perihelion dist = 1.77304538 AU Mag: H = 13.29, G = 0.15 Epoch of elements : MJD 54313.39300000 TDT (2007 Aug 01.393) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 01 4440 Tchantches 9h 26.0m UT 9.8 18 9 31.099-19 7 2.22TYC 6272-01843-1 10.0 15.0 11 1.3 1.126 -1.660 27.81 181.258 -19.124 40.09 18.06 9.4339 .53549 .45405 -3.01551 3.56153 0.00301 -0.00026 2000 134.6341542007 729.00000224.925325283.404165 21.3540970.077130171.921230201.7730453812.35 0.15 RATE 3.7011360 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.128 0.072 67.610.440 0.123 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 08, 16:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org