IOTA/IOTA-ES occultation update for (3614) Tumilty / TYC 1879-02336-1 event on 2008 May 20, 11:10 UT Visible from Japan Summary ------- On 2008 May 20 UT, the 58 km diameter asteroid (3614) Tumilty will occult a 10.4 mag star in the constellation Gemini for observers along a path across Japan. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.5 mag to 16.9 mag (the magnitude of the asteroid) for at most 1.5 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: 43 * date and approx. time of event: 2008 May 20, 11:11 - 2008 May 20, 11:12 UT * midpoint of event [JD]: 2454606.965375 * magnitude of target star: 10.4 * magnitude drop [mag]: 6.5 * estimated maximum duration [s]: 1.5 * Moon: 100 % sunlit, 146° distance * Sun: 38° distance * rough path description: Japan The occultation path -------------------- * approximate projected width [km]: 74 * 1 sigma uncertainty interval [path widths]: +/- 1.52 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .030", 108° ) * approx speed of asteroid's shadow [km/s]: 38.0665 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1879-02336-1 by 3614 Tumilty on 2008 May 20 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 121 0 0 42 8 5 11 11 48 30 275 0 41 44 7 42 32 13 40 32 12 43 46 35 122 0 0 41 39 4 11 11 50 29 276 -1 41 15 6 42 3 10 40 3 13 43 17 30 123 0 0 41 9 53 11 11 52 29 277 -2 40 45 56 41 33 59 39 34 6 42 48 16 124 0 0 40 40 33 11 11 53 28 277 -3 40 16 38 41 4 38 39 4 50 42 18 52 125 0 0 40 11 6 11 11 55 27 278 -4 39 47 12 40 35 9 38 35 27 41 49 19 126 0 0 39 41 32 11 11 56 26 279 -5 39 17 39 40 5 34 38 5 59 41 19 40 127 0 0 39 11 52 11 11 58 25 280 -6 38 48 1 39 35 53 37 36 25 40 49 53 128 0 0 38 42 7 11 11 59 24 281 -7 38 18 18 39 6 6 37 6 47 40 20 1 129 0 0 38 12 19 11 12 1 23 282 -8 37 48 31 38 36 16 36 37 6 39 50 5 130 0 0 37 42 27 11 12 2 23 282 -9 37 18 42 38 6 22 36 7 23 39 20 4 131 0 0 37 12 34 11 12 3 22 283 -10 36 48 50 37 36 26 35 37 38 38 50 2 132 0 0 36 42 39 11 12 5 21 284 -11 36 18 58 37 6 30 35 7 53 38 19 57 133 0 0 36 12 45 11 12 6 20 284 -11 35 49 7 36 36 33 34 38 8 37 49 52 134 0 0 35 42 52 11 12 7 19 285 -12 35 19 16 36 6 37 34 8 26 37 19 48 135 0 0 35 13 1 11 12 8 18 286 -13 34 49 28 35 36 43 33 38 45 36 49 45 136 0 0 34 43 12 11 12 9 17 286 -14 34 19 42 35 6 52 33 9 9 36 19 44 137 0 0 34 13 28 11 12 10 16 287 -15 33 50 1 34 37 4 32 39 37 35 49 47 138 0 0 33 43 49 11 12 11 15 288 -16 33 20 25 34 7 22 32 10 10 35 19 55 139 0 0 33 14 16 11 12 12 14 288 -17 32 50 56 33 37 46 31 40 50 34 50 8 140 0 0 32 44 50 11 12 13 13 289 -18 32 21 33 33 8 16 31 11 37 34 20 27 141 0 0 32 15 32 11 12 14 12 289 -19 31 52 18 32 38 55 30 42 32 33 50 55 142 0 0 31 46 23 11 12 15 11 290 -20 31 23 12 32 9 42 30 13 37 33 21 30 143 0 0 31 17 23 11 12 15 10 291 -21 30 54 17 31 40 39 29 44 52 32 52 15 144 0 0 30 48 35 11 12 16 10 291 -22 30 25 32 31 11 46 29 16 18 32 23 11 145 0 0 30 19 58 11 12 17 9 292 -23 29 56 59 30 43 5 28 47 56 31 54 18 146 0 0 29 51 33 11 12 17 8 292 -24 29 28 38 30 14 37 28 19 47 31 25 37 147 0 0 29 23 22 11 12 18 7 293 -25 29 0 31 29 46 22 .. .. .. 30 57 10 148 0 0 28 55 26 11 12 18 6 293 -26 28 32 38 29 18 21 .. .. .. 30 28 56 149 0 0 28 27 44 11 12 18 5 294 -27 28 5 1 28 50 36 .. .. .. 30 0 58 150 0 0 28 0 19 11 12 19 4 294 -28 27 37 39 28 23 6 .. .. .. 29 33 15 151 0 0 27 33 10 11 12 19 3 295 -29 27 10 34 27 55 53 .. .. .. 29 5 49 152 0 0 27 6 18 11 12 19 2 295 -30 26 43 47 27 28 58 .. .. .. 28 38 41 153 0 0 26 39 45 11 12 19 1 296 -31 26 17 18 27 2 20 .. .. .. 28 11 50 Uncertainty in time = +/- 3 secs [Prediction of 2008 Apr 13.0] Data for the target star ------------------------ * name: TYC 1879-02336-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 31 58.6891 DE: +22 59 26.219 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .023 ) * V mag [mag]: 10.4 * B mag [mag]: 11.1 * Apparent position with proper motion RA(deg): 98.1195867281 DE(deg): 22.9860842337 * Equation of equinoxes (radians) : 0.000039889686339 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3614) Tumilty approx. diameter [km]: 58 approx. diameter ["]: .020 distance from Earth [AU]: 3.91900 * orbital information: orbit source: Preston date of fit: 2008 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 543 number of rejected observations: 6 time covered by the observations: 1952 Feb 26 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.039, 0.020, 111° remarks: * orbital elements for (3614) Tumilty : Mean anomaly = 245.87772982 deg Arg. of pericenter = 307.80118048 deg Long. of node = 287.56646832 deg Inclination = 16.65052356 deg Eccentricity = 0.12977711 Semimajor axis = 2.98239544 AU Perihelion dist = 2.59534878 AU Mag: H = 10.50, G = 0.15 Epoch of elements : MJD 54606.46500000 TDT (2008 May 20.465) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 20 3614 Tumilty 11h 10.1m UT 10.4 6 31 58.689 22 59 26.22TYC 1879-02336-1 11.1 16.9 58 1.5 3.919 3.438 -8.38 51.9784 22.993 11.61 20.11 11.1690 0.10803 0.61546 21.15908 -3.73262 0.00346 -0.00021 2000 244.6405732008 514.00000307.801180287.566468 16.6505240.12977711 2.9823954 2.595348810.7 5.00.15 RATE 1.9136220 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.030 108 2.52 0.030 0 54569.5020080520_2336-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 13, 03:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org