IOTA/IOTA-ES occultation update for (1508) Kemi / TYC 3692-02202-1 event on 2012 Nov 22, 23:28 UT Visible from SW Asia, Europe Summary ------- On 2012 Nov 22 UT, the 18 km diameter asteroid (1508) Kemi will occult a 10.2 mag star in the constellation Perseus for observers along a path across SW Asia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 14.2 mag (the magnitude of the asteroid) for at most 1.7 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: . The event at a glimpse ---------------------- * Rank: 29 * date and approx. time of event: 2012 Nov 22, 23:19 - 2012 Nov 22, 23:35 UT * geocentric midpoint of event [JD]: 2456254.47825417 * magnitude of target star: 10.2 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 1.7 * Moon: 73 % sunlit, 58° distance * Sun: 137° distance * rough path description: SW Asia, Europe The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 2.30 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .074 +/- .061) * 1 sigma uncertainty ellipse (major, minor, PA): ( .074", .061", 263° ) * approx speed of asteroid's shadow [km/s]: 10.8489 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 3692-02202-1 by 1508 Kemi on 2012 Nov 22 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 63 8 32 - 1 0 0 23 19 24 1 326 -31 63 14 36 63 2 29 63 42 30 ... .. .. 62 29 37 0 0 0 23 19 24 2 326 -32 62 35 39 62 23 36 63 3 26 ... .. .. 61 51 13 1 0 0 23 19 25 3 326 -33 61 57 14 61 45 13 62 24 55 61 17 39 Latitude Latitude Latitude Latitude 60 0 0 3 58 3 23 19 28 7 326 -36 4 7 45 3 48 21 4 52 36 3 3 59 59 0 0 5 36 33 23 19 31 8 326 -37 5 46 23 5 26 43 6 31 52 4 41 44 58 0 0 7 16 36 23 19 34 10 326 -39 7 26 34 7 6 38 8 12 40 6 21 3 57 0 0 8 58 4 23 19 38 12 326 -40 9 8 10 8 47 59 9 54 53 8 1 48 56 0 0 10 40 48 23 19 43 14 326 -42 10 51 2 10 30 35 11 38 20 9 43 50 55 0 0 12 24 37 23 19 49 16 326 -43 12 34 58 12 14 17 13 22 52 11 26 58 54 0 0 14 9 21 23 19 55 18 325 -44 14 19 50 13 58 54 15 8 17 13 11 3 53 0 0 15 54 49 23 20 2 20 325 -46 16 5 24 15 44 14 16 54 24 14 55 52 52 0 0 17 40 47 23 20 10 22 325 -47 17 51 29 17 30 6 18 41 0 16 41 14 51 0 0 19 27 4 23 20 19 24 324 -48 19 37 53 19 16 17 20 27 53 18 26 57 50 0 0 21 13 27 23 20 28 26 324 -49 21 24 21 21 2 34 22 14 49 20 12 48 49 0 0 22 59 42 23 20 37 28 323 -50 23 10 42 22 48 44 24 1 36 21 58 34 48 0 0 24 45 36 23 20 48 30 323 -51 24 56 41 24 34 33 25 47 58 23 44 1 47 0 0 26 30 56 23 20 59 32 322 -52 26 42 5 26 19 48 27 33 43 25 28 56 46 0 0 28 15 28 23 21 10 34 321 -53 28 26 41 28 4 16 29 18 38 27 13 6 45 0 0 29 58 59 23 21 22 36 320 -54 30 10 15 29 47 44 31 2 28 28 56 19 44 0 0 31 41 16 23 21 34 37 320 -54 31 52 35 31 29 59 32 45 2 30 38 22 43 0 0 33 22 8 23 21 46 39 319 -55 33 33 29 33 10 48 34 26 6 32 19 3 42 0 0 35 1 23 23 21 59 41 318 -55 35 12 46 34 50 2 36 5 30 33 58 10 41 0 0 36 38 50 23 22 12 43 317 -55 36 50 14 36 27 28 37 43 2 35 35 33 40 0 0 38 14 20 23 22 25 44 316 -56 38 25 44 38 2 58 39 18 32 37 11 2 39 0 0 39 47 43 23 22 38 46 314 -56 39 59 6 39 36 21 40 51 52 38 44 28 38 0 0 41 18 52 23 22 52 47 313 -56 41 30 14 41 7 31 42 22 54 40 15 44 37 0 0 42 47 39 23 23 5 49 312 -56 42 58 59 42 36 21 43 51 31 41 44 42 36 0 0 44 13 59 23 23 18 50 310 -55 44 25 17 44 2 43 45 17 37 43 11 17 35 0 0 45 37 48 23 23 31 52 309 -55 45 49 2 45 26 35 46 41 7 44 35 23 34 0 0 46 59 1 23 23 44 53 307 -55 47 10 11 46 47 52 48 1 58 45 56 57 33 0 0 48 17 36 23 23 57 54 306 -54 48 28 42 48 6 31 49 20 8 47 15 57 32 0 0 49 33 31 23 24 9 56 304 -54 49 44 32 49 22 32 50 35 35 48 32 20 31 0 0 50 46 47 23 24 22 57 302 -54 50 57 42 50 35 53 51 48 19 49 46 5 30 0 0 51 57 22 23 24 34 58 300 -53 52 8 12 51 46 34 52 58 21 50 57 14 29 0 0 53 5 19 23 24 46 59 299 -53 53 16 2 52 54 37 54 5 41 52 5 46 28 0 0 54 10 39 23 24 57 60 297 -52 54 21 15 54 0 4 55 10 22 53 11 43 27 0 0 55 13 24 23 25 8 61 295 -52 55 23 53 55 2 56 56 12 27 54 15 7 26 0 0 56 13 37 23 25 19 62 292 -51 56 23 59 56 3 17 57 11 58 55 16 1 25 0 0 57 11 23 23 25 30 63 290 -50 57 21 37 57 1 10 58 9 0 56 14 29 24 0 0 58 6 44 23 25 40 63 288 -50 58 16 50 57 56 39 59 3 36 57 10 33 23 0 0 58 59 45 23 25 50 64 286 -49 59 9 43 58 49 48 59 55 52 58 4 19 22 0 0 59 50 31 23 25 59 65 284 -49 60 0 21 59 40 42 60 45 51 58 55 49 21 0 0 60 39 5 23 26 8 65 281 -48 60 48 47 60 29 25 61 33 39 59 45 9 20 0 0 61 25 33 23 26 17 66 279 -48 61 35 7 61 16 1 62 19 20 60 32 22 19 0 0 62 10 0 23 26 26 67 276 -47 62 19 25 62 0 36 63 2 59 61 17 35 18 0 0 62 52 30 23 26 34 67 274 -47 63 1 47 62 43 14 63 44 42 62 0 50 17 0 0 63 33 8 23 26 43 68 272 -46 63 42 16 63 24 0 64 24 33 62 42 13 16 0 0 64 11 58 23 26 50 68 269 -46 64 20 59 64 2 59 65 2 37 63 21 49 15 0 0 64 49 6 23 26 58 68 267 -45 64 57 58 64 40 15 65 38 59 63 59 41 14 0 0 65 24 36 23 27 5 69 264 -45 65 33 20 65 15 52 66 13 44 64 35 55 13 0 0 65 58 32 23 27 12 69 262 -44 66 7 8 65 49 56 66 46 55 65 10 34 12 0 0 66 30 58 23 27 19 69 259 -44 66 39 27 66 22 30 67 18 38 65 43 43 11 0 0 67 1 59 23 27 25 70 257 -43 67 10 20 66 53 38 67 48 56 66 15 26 10 0 0 67 31 38 23 27 32 70 254 -43 67 39 52 67 23 25 68 17 53 66 45 46 9 0 0 68 0 0 23 27 38 70 252 -42 68 8 7 67 51 54 68 45 34 67 14 48 8 0 0 68 27 8 23 27 44 70 249 -42 68 35 8 68 19 9 69 12 2 67 42 35 7 0 0 68 53 5 23 27 50 70 247 -41 69 0 58 68 45 13 69 37 20 68 9 11 6 0 0 69 17 55 23 27 55 70 244 -41 69 25 41 69 10 10 70 1 31 68 34 38 5 0 0 69 41 41 23 28 1 71 242 -41 69 49 20 69 34 3 70 24 40 68 59 0 4 0 0 70 4 26 23 28 6 71 240 -40 70 11 59 69 56 54 70 46 48 69 22 21 3 0 0 70 26 12 23 28 11 71 237 -40 70 33 39 70 18 47 71 8 0 69 44 42 2 0 0 70 47 3 23 28 16 71 235 -40 70 54 24 70 39 44 71 28 17 70 6 6 1 0 0 71 7 1 23 28 20 71 233 -39 71 14 16 70 59 47 71 47 41 70 26 37 0 0 0 71 26 9 23 28 25 71 230 -39 71 33 18 71 19 0 72 6 16 70 46 16 - 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2012 Oct 31 1 sigma uncertainty ellipse (major, minor, PA): 0.061, 0.037, -152° remarks: * orbital elements for (1508) Kemi : Mean anomaly = 341.10803000 deg Arg. of pericenter = 92.79795731 deg Long. of node = 14.34293599 deg Inclination = 28.72992292 deg Eccentricity = 0.41757879 Semimajor axis = 2.77081817 AU Perihelion dist = 1.61378328 AU Mag: H = 11.96, G = 0.15 Epoch of elements : MJD 56253.97800000 TDT (2012 Nov 22.978) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 22 1508 Kemi 23h 28.7m UT 10.2 1 51 48.219 56 20 55.14TYC 3692-02202-1 10.7 14.2 18 1.7 0.926 -6.516 21.12 -26.5690 56.344 -175.57 -20.37 23.4781 0.11572 0.29390 -5.70382 2.22775 0.00248 -0.00243 2000 340.25795620121119.00000 92.797957 14.342936 28.7299230.41757879 2.7708182 1.613783312.0 5.00.15 RATE 2.1369380 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.074 0.061 263 3.30 0.062 0 0 2-5 056247.0020121122_2202-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org