IOTA/IOTA-ES occultation update for (5651) Traversa / TYC 1422-01164-1 event on 2008 May 15, 20:30 UT Visible from Africa Summary ------- On 2008 May 15 UT, the 27 km diameter asteroid (5651) Traversa will occult a 9.5 mag star in the constellation Leo for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.5 mag to 18.0 mag (the magnitude of the asteroid) for at most 2.2 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: 15 * date and approx. time of event: 2008 May 15, 20:29 - 2008 May 15, 20:38 UT * midpoint of event [JD]: 2454602.3543125 * magnitude of target star: 9.5 * magnitude drop [mag]: 8.5 * estimated maximum duration [s]: 2.2 * Moon: 84 % sunlit, 42° distance * Sun: 93° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 4.44 * 1 sigma uncertainty interval [seconds]: +/- 11.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .060 +/- .048) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .048", 94° ) * approx speed of asteroid's shadow [km/s]: 12.1157 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1422-01164-1 by 5651 Traversa on 2008 May 15 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 - 28 0 0 27 35 28 20 29 52 81 185 0 27 27 35 27 43 21 26 17 43 28 53 29 - 27 0 0 27 15 36 20 30 1 81 191 -1 27 7 42 27 23 30 25 57 40 28 33 47 - 26 0 0 26 55 18 20 30 10 81 198 -2 26 47 23 27 3 13 25 37 12 28 13 41 - 25 0 0 26 34 36 20 30 19 81 205 -3 26 26 40 26 42 32 25 16 20 27 53 9 - 24 0 0 26 13 29 20 30 29 81 212 -4 26 5 32 26 21 26 24 55 2 27 32 13 - 23 0 0 25 51 57 20 30 38 81 218 -5 25 43 59 25 59 56 24 33 20 27 10 52 - 22 0 0 25 30 1 20 30 47 80 225 -6 25 22 2 25 38 1 24 11 13 26 49 6 - 21 0 0 25 7 41 20 30 56 80 230 -7 24 59 41 25 15 42 23 48 43 26 26 57 - 20 0 0 24 44 57 20 31 6 79 236 -8 24 36 56 24 52 59 23 25 49 26 4 23 - 19 0 0 24 21 50 20 31 15 79 240 -9 24 13 47 24 29 52 23 2 31 25 41 26 - 18 0 0 23 58 19 20 31 24 78 245 -10 23 50 15 24 6 22 22 38 50 25 18 5 - 17 0 0 23 34 25 20 31 34 77 249 -11 23 26 20 23 42 30 22 14 46 24 54 22 - 16 0 0 23 10 9 20 31 43 77 252 -12 23 2 3 23 18 14 21 50 20 24 30 15 - 15 0 0 22 45 30 20 31 52 76 255 -13 22 37 23 22 53 37 21 25 31 24 5 47 - 14 0 0 22 20 29 20 32 2 75 258 -14 22 12 22 22 28 37 21 0 21 23 40 56 - 13 0 0 21 55 7 20 32 11 74 261 -15 21 46 59 22 3 16 20 34 50 23 15 43 - 12 0 0 21 29 25 20 32 21 73 263 -16 21 21 15 21 37 34 20 8 58 22 50 10 - 11 0 0 21 3 21 20 32 30 72 265 -17 20 55 11 21 11 32 19 42 46 22 24 16 - 10 0 0 20 36 58 20 32 40 71 267 -18 20 28 47 20 45 9 19 16 14 21 58 1 - 9 0 0 20 10 15 20 32 49 71 269 -19 20 2 4 20 18 28 18 49 23 21 31 27 - 8 0 0 19 43 14 20 32 58 70 270 -21 19 35 1 19 51 27 18 22 13 21 4 34 - 7 0 0 19 15 54 20 33 8 69 272 -22 19 7 41 19 24 8 17 54 46 20 37 22 - 6 0 0 18 48 17 20 33 17 68 273 -23 18 40 2 18 56 31 17 27 1 20 9 52 - 5 0 0 18 20 22 20 33 26 67 274 -24 18 12 7 18 28 38 16 58 59 19 42 5 - 4 0 0 17 52 11 20 33 36 66 276 -25 17 43 56 18 0 27 16 30 41 19 14 1 - 3 0 0 17 23 45 20 33 45 65 277 -26 17 15 28 17 32 2 16 2 8 18 45 41 - 2 0 0 16 55 3 20 33 54 63 278 -27 16 46 46 17 3 21 15 33 21 18 17 6 - 1 0 0 16 26 8 20 34 3 62 279 -28 16 17 50 16 34 26 15 4 19 17 48 16 0 0 0 15 56 59 20 34 12 61 280 -29 15 48 40 16 5 17 14 35 5 17 19 12 1 0 0 15 27 37 20 34 21 60 280 -30 15 19 18 15 35 56 14 5 38 16 49 56 2 0 0 14 58 3 20 34 30 59 281 -31 14 49 44 15 6 22 13 36 0 16 20 27 3 0 0 14 28 18 20 34 39 58 282 -33 14 19 59 14 36 38 13 6 11 15 50 46 4 0 0 13 58 23 20 34 48 57 283 -34 13 50 3 14 6 43 12 36 12 15 20 55 5 0 0 13 28 19 20 34 57 56 283 -35 13 19 58 13 36 39 12 6 5 14 50 54 6 0 0 12 58 6 20 35 5 55 284 -36 12 49 45 13 6 27 11 35 49 14 20 44 7 0 0 12 27 45 20 35 14 54 284 -37 12 19 24 12 36 6 11 5 26 13 50 25 8 0 0 11 57 18 20 35 22 53 285 -38 11 48 57 12 5 39 10 34 57 13 20 0 9 0 0 11 26 45 20 35 31 52 285 -39 11 18 24 11 35 6 10 4 22 12 49 29 10 0 0 10 56 7 20 35 39 50 286 -40 10 47 45 11 4 28 9 33 43 12 18 52 11 0 0 10 25 25 20 35 47 49 286 -41 10 17 3 10 33 46 9 3 1 11 48 10 12 0 0 9 54 40 20 35 55 48 287 -43 9 46 18 10 3 1 8 32 15 11 17 25 13 0 0 9 23 52 20 36 3 47 287 -44 9 15 31 9 32 14 8 1 29 10 46 38 14 0 0 8 53 4 20 36 10 46 287 -45 8 44 43 9 1 26 7 30 41 10 15 49 15 0 0 8 22 16 20 36 18 45 288 -46 8 13 54 8 30 37 6 59 54 9 44 59 16 0 0 7 51 28 20 36 25 44 288 -47 7 43 7 7 59 49 6 29 8 9 14 9 17 0 0 7 20 41 20 36 33 43 288 -48 7 12 21 7 29 2 5 58 24 8 43 21 18 0 0 6 49 58 20 36 40 41 289 -49 6 41 37 6 58 18 5 27 43 8 12 35 19 0 0 6 19 18 20 36 47 40 289 -50 6 10 57 6 27 38 4 57 6 7 41 51 20 0 0 5 48 42 20 36 53 39 289 -51 5 40 22 5 57 2 4 26 33 7 11 12 21 0 0 5 18 11 20 37 0 38 289 -53 5 9 52 5 26 31 3 56 7 6 40 38 22 0 0 4 47 47 20 37 6 37 290 -54 4 39 28 4 56 6 3 25 47 6 10 9 23 0 0 4 17 30 20 37 13 36 290 -55 4 9 12 4 25 49 2 55 34 5 39 48 24 0 0 3 47 21 20 37 19 35 290 -56 3 39 3 3 55 39 2 25 30 5 9 34 25 0 0 3 17 21 20 37 25 34 290 -57 3 9 3 3 25 38 1 55 36 4 39 28 26 0 0 2 47 30 20 37 31 32 290 -58 2 39 13 2 55 47 1 25 51 4 9 31 27 0 0 2 17 50 20 37 36 31 290 -59 2 9 34 2 26 7 0 56 17 3 39 45 28 0 0 1 48 21 20 37 41 30 290 -60 1 40 6 1 56 37 0 26 55 3 10 10 29 0 0 1 19 5 20 37 47 29 290 -61 1 10 50 1 27 20 - 0 2 15 2 40 46 30 0 0 0 50 1 20 37 52 28 291 -62 0 41 47 0 58 15 - 0 31 12 2 11 36 31 0 0 0 21 11 20 37 56 27 291 -63 0 12 57 0 29 24 - 0 59 55 1 42 38 32 0 0 - 0 7 25 20 38 1 26 291 -64 - 0 15 38 0 0 48 - 1 28 23 1 13 54 33 0 0 - 0 35 46 20 38 6 25 291 -65 - 0 43 58 - 0 27 34 - 1 56 36 0 45 26 34 0 0 - 1 3 51 20 38 10 23 291 -66 - 1 12 2 - 0 55 40 - 2 24 33 0 17 12 35 0 0 - 1 31 40 20 38 14 22 291 -67 - 1 39 50 - 1 23 29 - 2 52 13 - 0 10 45 36 0 0 - 1 59 11 20 38 18 21 291 -68 - 2 7 21 - 1 51 2 - 3 19 36 - 0 38 25 37 0 0 - 2 26 25 20 38 21 20 291 -69 - 2 34 34 - 2 18 17 - 3 46 42 - 1 5 48 38 0 0 - 2 53 21 20 38 25 19 291 -70 - 3 1 29 - 2 45 14 - 4 13 29 - 1 32 53 39 0 0 - 3 19 58 20 38 28 18 291 -71 - 3 28 5 - 3 11 52 - 4 39 57 - 1 59 39 40 0 0 - 3 46 16 20 38 31 17 291 -72 - 3 54 22 - 3 38 10 - 5 6 5 - 2 26 6 41 0 0 - 4 12 14 20 38 34 16 290 -73 - 4 20 19 - 4 4 9 - 5 31 54 - 2 52 14 42 0 0 - 4 37 52 20 38 36 15 290 -74 - 4 45 56 - 4 29 48 - 5 57 22 - 3 18 1 43 0 0 - 5 3 9 20 38 39 14 290 -75 - 5 11 11 - 4 55 6 - 6 22 30 - 3 43 28 44 0 0 - 5 28 4 20 38 41 12 290 -75 - 5 36 6 - 5 20 2 - 6 47 16 - 4 8 33 45 0 0 - 5 52 38 20 38 43 11 290 -76 - 6 0 39 - 5 44 38 - 7 11 40 - 4 33 17 46 0 0 - 6 16 51 20 38 45 10 290 -77 - 6 24 50 - 6 8 51 - 7 35 42 - 4 57 39 47 0 0 - 6 40 40 20 38 47 9 290 -77 - 6 48 39 - 6 32 41 - 7 59 22 - 5 21 39 48 0 0 - 7 4 7 20 38 48 8 290 -78 - 7 12 5 - 6 56 9 - 8 22 39 - 5 45 15 49 0 0 - 7 27 11 20 38 50 7 290 -78 - 7 35 7 - 7 19 14 - 8 45 33 - 6 8 29 50 0 0 - 7 49 51 20 38 51 6 290 -79 - 7 57 47 - 7 41 55 - 9 8 3 - 6 31 20 51 0 0 - 8 12 8 20 38 52 5 289 -79 - 8 20 2 - 8 4 13 - 9 30 10 - 6 53 46 52 0 0 - 8 34 0 20 38 52 4 289 -79 - 8 41 54 - 8 26 6 - 9 51 53 - 7 15 49 53 0 0 - 8 55 29 20 38 53 3 289 -79 - 9 3 21 - 8 47 36 .. .. .. - 7 37 27 54 0 0 - 9 16 33 20 38 53 2 289 -79 - 9 24 24 - 9 8 41 .. .. .. - 7 58 41 55 0 0 - 9 37 12 20 38 54 1 289 -79 - 9 45 3 - 9 29 21 .. .. .. - 8 19 30 Uncertainty in time = +/- 12 secs [Prediction of 2008 Feb 17.0] Data for the target star ------------------------ * name: TYC 1422-01164-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 10 06.7550 DE: +18 28 51.491 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .029 ) * V mag [mag]: 9.5 * B mag [mag]: 10.1 * Apparent position with proper motion RA(deg): 152.6461715522 DE(deg): 18.4401378390 * Equation of equinoxes (radians) : 0.000040026997399 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5651) Traversa approx. diameter [km]: 27 approx. diameter ["]: .011 distance from Earth [AU]: 3.37800 * orbital information: orbit source: Preston date of fit: 2008 Feb 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 639 number of rejected observations: 9 time covered by the observations: 1977 Aug 18 - 2008 Jan 09 1 sigma uncertainty ellipse (major, minor, PA): 0.056, 0.038, 94° remarks: * orbital elements for (5651) Traversa : Mean anomaly = 147.01072949 deg Arg. of pericenter = 230.61992147 deg Long. of node = 139.26318637 deg Inclination = 14.64296997 deg Eccentricity = 0.15519322 Semimajor axis = 3.14352872 AU Perihelion dist = 2.65567437 AU Mag: H = 11.42, G = 0.15 Epoch of elements : MJD 54601.85400000 TDT (2008 May 15.854) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 15 5651 Traversa 20h 30.2m UT 9.5 10 10 6.755 18 28 51.49TYC 1422-01164-1 10.1 18.0 27 2.2 3.378 1.183 -5.81 -28.9602 18.483 -128.46 19.11 20.5035 0.04807 0.14369 6.46441 -2.23057 0.00535 -0.00206 2000 146.6828702008 514.00000230.619921139.263186 14.6429700.15519322 3.1435287 2.655674411.7 5.00.15 RATE 1.7683890 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.048 94 5.44 0.049 0 54513.5020080515_1164-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 09, 17:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org