IOTA/IOTA-ES occultation update for (1843) Jarmila / TYC 6272-01167-1 event on 2008 Oct 13, 02:50 UT Visible from W USA Summary ------- On 2008 Oct 13 UT, the 26 km diameter asteroid (1843) Jarmila will occult a 10.1 mag star in the constellation Sagittarius for observers along a path across W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.2 mag to 16.3 mag (the magnitude of the asteroid) for at most 0.9 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: 36 * date and approx. time of event: 2008 Oct 13, 02:51 - 2008 Oct 13, 02:53 UT * midpoint of event [JD]: 2454752.61867917 * magnitude of target star: 10.1 * magnitude drop [mag]: 6.2 * estimated maximum duration [s]: 0.9 * Moon: 96 % sunlit, 84° distance * Sun: 74° distance * rough path description: W USA The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 1.85 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .030", 83° ) * approx speed of asteroid's shadow [km/s]: 28.3326 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6272-01167-1 by 1843 Jarmila on 2008 Oct 13 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 -141 0 0 31 6 27 2 51 40 39 192 0 30 55 37 31 17 18 30 15 55 31 57 51 -140 0 0 31 16 47 2 51 43 39 194 -1 31 5 57 31 27 40 30 26 10 32 8 16 -139 0 0 31 27 33 2 51 46 38 195 -2 31 16 42 31 38 27 30 36 52 32 19 7 -138 0 0 31 38 45 2 51 50 38 196 -3 31 27 53 31 49 40 30 47 58 32 30 25 -137 0 0 31 50 22 2 51 53 38 197 -4 31 39 29 32 1 19 30 59 30 32 42 8 -136 0 0 32 2 25 2 51 56 37 198 -5 31 51 30 32 13 22 31 11 27 32 54 16 -135 0 0 32 14 52 2 51 59 37 199 -5 32 3 56 32 25 51 31 23 49 33 6 49 -134 0 0 32 27 44 2 52 2 36 200 -6 32 16 47 32 38 44 31 36 35 33 19 47 -133 0 0 32 41 0 2 52 5 36 201 -7 32 30 2 32 52 1 31 49 45 33 33 10 -132 0 0 32 54 40 2 52 8 35 202 -8 32 43 40 33 5 43 32 3 19 33 46 56 -131 0 0 33 8 44 2 52 11 35 203 -9 32 57 43 33 19 48 32 17 17 34 1 7 -130 0 0 33 23 11 2 52 14 34 204 -10 33 12 8 33 34 16 32 31 37 34 15 41 -129 0 0 33 38 1 2 52 17 33 205 -11 33 26 57 33 49 8 32 46 20 34 30 37 -128 0 0 33 53 13 2 52 20 33 206 -11 33 42 8 34 4 22 33 1 26 34 45 57 -127 0 0 34 8 48 2 52 23 32 207 -12 33 57 41 34 19 58 33 16 54 35 1 39 -126 0 0 34 24 44 2 52 25 32 208 -13 34 13 35 34 35 55 33 32 43 35 17 42 -125 0 0 34 41 2 2 52 28 31 209 -14 34 29 52 34 52 15 33 48 54 35 34 7 -124 0 0 34 57 40 2 52 31 30 210 -15 34 46 28 35 8 55 34 5 25 35 50 53 -123 0 0 35 14 39 2 52 33 30 211 -16 35 3 26 35 25 55 34 22 16 36 8 0 -122 0 0 35 31 58 2 52 36 29 212 -16 35 20 43 35 43 15 34 39 28 36 25 26 -121 0 0 35 49 36 2 52 38 28 213 -17 35 38 20 36 0 55 34 56 59 36 43 12 -120 0 0 36 7 33 2 52 41 28 214 -18 35 56 15 36 18 54 35 14 49 37 1 18 -119 0 0 36 25 49 2 52 43 27 215 -19 36 14 29 36 37 12 35 32 57 37 19 41 -118 0 0 36 44 23 2 52 45 26 215 -20 36 33 1 36 55 47 35 51 23 37 38 23 -117 0 0 37 3 14 2 52 48 25 216 -20 36 51 51 37 14 40 36 10 7 37 57 23 -116 0 0 37 22 22 2 52 50 25 217 -21 37 10 58 37 33 50 36 29 7 38 16 39 -115 0 0 37 41 47 2 52 52 24 218 -22 37 30 20 37 53 16 36 48 24 38 36 12 -114 0 0 38 1 27 2 52 54 23 219 -23 37 49 59 38 12 58 37 7 56 38 56 0 -113 0 0 38 21 23 2 52 56 22 220 -23 38 9 53 38 32 55 37 27 44 39 16 4 -112 0 0 38 41 33 2 52 58 22 220 -24 38 30 1 38 53 7 37 47 46 39 36 22 -111 0 0 39 1 57 2 53 0 21 221 -25 38 50 24 39 13 33 38 8 3 39 56 55 -110 0 0 39 22 35 2 53 1 20 222 -26 39 11 0 39 34 12 38 28 33 40 17 40 -109 0 0 39 43 25 2 53 3 19 223 -26 39 31 48 39 55 4 38 49 15 40 38 39 -108 0 0 40 4 27 2 53 5 19 223 -27 39 52 49 40 16 9 39 10 10 40 59 49 -107 0 0 40 25 41 2 53 6 18 224 -28 40 14 2 40 37 24 39 31 17 41 21 12 -106 0 0 40 47 6 2 53 8 17 225 -28 40 35 25 40 58 51 39 52 34 41 42 44 -105 0 0 41 8 41 2 53 9 16 226 -29 40 56 58 41 20 28 40 14 2 42 4 27 -104 0 0 41 30 26 2 53 11 15 226 -29 41 18 41 41 42 14 40 35 39 42 26 20 -103 0 0 41 52 19 2 53 12 15 227 -30 41 40 33 42 4 9 40 57 25 42 48 21 -102 0 0 42 14 21 2 53 13 14 228 -31 42 2 33 42 26 12 41 19 20 43 10 30 -101 0 0 42 36 30 2 53 14 13 229 -31 42 24 41 42 48 23 41 41 22 43 32 47 -100 0 0 42 58 46 2 53 15 12 229 -32 42 46 55 43 10 40 42 3 31 43 55 10 - 99 0 0 43 21 8 2 53 16 11 230 -32 43 9 16 43 33 4 42 25 46 44 17 39 - 98 0 0 43 43 35 2 53 17 11 231 -33 43 31 42 43 55 32 42 48 7 44 40 13 - 97 0 0 44 6 7 2 53 18 10 231 -33 43 54 12 44 18 6 43 10 33 45 2 52 - 96 0 0 44 28 44 2 53 19 9 232 -34 44 16 47 44 40 43 43 33 2 45 25 35 - 95 0 0 44 51 23 2 53 19 8 233 -34 44 39 25 45 3 24 43 55 36 45 48 21 - 94 0 0 45 14 5 2 53 20 7 234 -35 45 2 6 45 26 7 44 18 12 46 11 9 - 93 0 0 45 36 49 2 53 21 7 234 -35 45 24 48 45 48 52 44 40 50 46 33 59 - 92 0 0 45 59 34 2 53 21 6 235 -36 45 47 32 46 11 39 45 3 30 46 56 50 - 91 0 0 46 22 19 2 53 22 5 236 -36 46 10 17 46 34 25 45 26 10 47 19 41 - 90 0 0 46 45 5 2 53 22 4 237 -37 46 33 1 46 57 12 45 48 51 47 42 32 - 89 0 0 47 7 49 2 53 22 3 237 -37 46 55 45 47 19 57 .. .. .. 48 5 21 - 88 0 0 47 30 32 2 53 22 3 238 -37 47 18 27 47 42 41 .. .. .. 48 28 9 - 87 0 0 47 53 13 2 53 23 2 239 -38 47 41 6 48 5 23 .. .. .. 48 50 54 - 86 0 0 48 15 51 2 53 23 1 239 -38 48 3 44 48 28 2 .. .. .. 49 13 36 - 85 0 0 48 38 25 2 53 23 0 240 -38 48 26 17 48 50 37 .. .. .. .. .. .. Uncertainty in time = +/- 2 secs [Prediction of 2008 Sep 11.0] Data for the target star ------------------------ * name: TYC 6272-01167-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 14 53.1905 DE: -18 59 26.935 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 10.1 * B mag [mag]: 10.1 * Apparent position with proper motion RA(deg): 273.8523324522 DE(deg): -18.9890987215 * Equation of equinoxes (radians) : 0.000048172295876 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1843) Jarmila approx. diameter [km]: 26 approx. diameter ["]: .016 distance from Earth [AU]: 2.25700 * orbital information: orbit source: Preston date of fit: 2008 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 944 number of rejected observations: 22 time covered by the observations: 1935 Aug 29 - 2008 Jul 23 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.019, 78° remarks: * orbital elements for (1843) Jarmila : Mean anomaly = 0.61025046 deg Arg. of pericenter = 31.70703491 deg Long. of node = 267.15846056 deg Inclination = 8.43372958 deg Eccentricity = 0.17257442 Semimajor axis = 2.65232141 AU Perihelion dist = 2.19459857 AU Mag: H = 11.73, G = 0.15 Epoch of elements : MJD 54752.11900000 TDT (2008 Oct 13.119) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 13 1843 Jarmila 2h 50.9m UT 10.1 18 14 53.191-18 59 26.94TYC 6272-01167-1 10.1 16.3 26 0.9 2.257 4.382 4.34 -151.0477 -18.991 133.84 -7.88 2.8483 -0.05264 0.74605 15.95294 1.11258 0.00522 0.00025 2000 0.12675120081011.00000 31.707035267.158461 8.4337300.17257442 2.6523214 2.194598611.6 5.00.15 RATE 2.2817330 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.030 83 2.85 0.030 0 54720.5020081013_1167-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 17:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org