IOTA/IOTA-ES occultation update for (3614) Tumilty / 2UCAC 41843807 event on 2008 Feb 02, 02:54 UT Visible from Brazil Summary ------- On 2008 Feb 02 UT, the 58 km diameter asteroid (3614) Tumilty will occult a 11.2 mag star in the constellation Taurus for observers along a path across Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.0 mag to 16.2 mag (the magnitude of the asteroid) for at most 8.1 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: 31 * date and approx. time of event: 2008 Feb 02, 02:46 - 2008 Feb 02, 03:02 UT * midpoint of event [JD]: 2454498.62127083 * magnitude of target star: 11.2 * magnitude drop [mag]: 5.0 * estimated maximum duration [s]: 8.1 * Moon: 24 % sunlit, 177° distance * Sun: 125° distance * rough path description: Brazil The occultation path -------------------- * approximate projected width [km]: 105 * 1 sigma uncertainty interval [path widths]: +/- 2.18 * 1 sigma uncertainty interval [seconds]: +/- 12.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .068 +/- .047) * 1 sigma uncertainty ellipse (major, minor, PA): ( .069", .047", 98° ) * approx speed of asteroid's shadow [km/s]: 7.1787 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 41843807 by 3614 Tumilty on 2008 Feb 02 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 - 45 51 43 -46 0 0 3 2 47 0 314 -27 - 46 51 2 ... .. .. ... .. .. ... .. .. - 47 16 57 -45 0 0 3 2 47 1 315 -28 - 48 12 17 - 46 19 43 ... .. .. ... .. .. - 48 32 5 -44 0 0 3 2 45 3 315 -29 - 49 24 10 - 47 38 23 ... .. .. - 43 20 43 - 49 38 45 -43 0 0 3 2 43 4 316 -30 - 50 28 9 - 48 48 0 ... .. .. - 44 47 0 - 50 38 12 -42 0 0 3 2 40 5 317 -31 - 51 25 20 - 49 49 54 ... .. .. - 46 2 30 - 51 31 22 -41 0 0 3 2 37 7 317 -31 - 52 16 32 - 50 45 10 ... .. .. - 47 9 5 - 52 19 0 -40 0 0 3 2 33 8 318 -32 - 53 2 28 - 51 34 36 ... .. .. - 48 8 6 - 53 1 42 -39 0 0 3 2 29 9 318 -33 - 53 43 41 - 52 18 52 ... .. .. - 49 0 36 - 53 39 57 -38 0 0 3 2 24 10 319 -34 - 54 20 37 - 52 58 31 - 57 9 58 - 49 47 23 - 54 14 11 -37 0 0 3 2 18 11 319 -35 - 54 53 41 - 53 33 58 - 57 38 31 - 50 29 5 - 54 44 43 -36 0 0 3 2 12 12 319 -36 - 55 23 11 - 54 5 36 - 58 3 59 - 51 6 14 - 55 11 52 -35 0 0 3 2 6 13 319 -37 - 55 49 23 - 54 33 43 - 58 26 33 - 51 39 14 - 55 35 52 -34 0 0 3 1 59 14 320 -38 - 56 12 33 - 54 58 36 - 58 46 25 - 52 8 28 - 55 56 56 -33 0 0 3 1 52 15 320 -38 - 56 32 52 - 55 20 27 - 59 3 46 - 52 34 12 - 56 15 16 -32 0 0 3 1 44 16 320 -39 - 56 50 31 - 55 39 30 - 59 18 43 - 52 56 44 - 56 31 1 -31 0 0 3 1 36 17 320 -40 - 57 5 39 - 55 55 53 - 59 31 24 - 53 16 14 - 56 44 20 -30 0 0 3 1 28 18 320 -41 - 57 18 24 - 56 9 47 - 59 41 57 - 53 32 56 - 56 55 20 -29 0 0 3 1 19 19 320 -42 - 57 28 54 - 56 21 18 - 59 50 26 - 53 46 58 - 57 4 7 -28 0 0 3 1 10 19 320 -43 - 57 37 15 - 56 30 34 - 59 56 58 - 53 58 29 - 57 10 48 -27 0 0 3 1 0 20 320 -44 - 57 43 32 - 56 37 40 - 60 1 36 - 54 7 35 - 57 15 28 -26 0 0 3 0 50 21 319 -45 - 57 47 49 - 56 42 41 - 60 4 26 - 54 14 25 - 57 18 9 -25 0 0 3 0 40 22 319 -45 - 57 50 11 - 56 45 43 - 60 5 29 - 54 19 2 - 57 18 58 -24 0 0 3 0 29 23 319 -46 - 57 50 42 - 56 46 49 - 60 4 51 - 54 21 31 - 57 17 55 -23 0 0 3 0 19 23 319 -47 - 57 49 25 - 56 46 2 - 60 2 32 - 54 21 57 - 57 15 5 -22 0 0 3 0 7 24 318 -48 - 57 46 22 - 56 43 25 - 59 58 36 - 54 20 22 - 57 10 29 -21 0 0 2 59 56 25 318 -49 - 57 41 35 - 56 39 0 - 59 53 4 - 54 16 50 - 57 4 10 -20 0 0 2 59 44 26 318 -50 - 57 35 6 - 56 32 50 - 59 45 57 - 54 11 23 - 56 56 8 -19 0 0 2 59 32 26 317 -51 - 57 26 57 - 56 24 56 - 59 37 18 - 54 4 2 - 56 46 25 -18 0 0 2 59 19 27 317 -52 - 57 17 9 - 56 15 18 - 59 27 7 - 53 54 49 - 56 35 2 -17 0 0 2 59 6 28 316 -53 - 57 5 42 - 56 3 59 - 59 15 24 - 53 43 44 - 56 21 58 -16 0 0 2 58 53 28 316 -54 - 56 52 37 - 55 50 57 - 59 2 10 - 53 30 48 - 56 7 14 -15 0 0 2 58 40 29 316 -55 - 56 37 53 - 55 36 12 - 58 47 25 - 53 16 1 - 55 50 50 -14 0 0 2 58 26 29 315 -56 - 56 21 30 - 55 19 46 - 58 31 8 - 52 59 22 - 55 32 44 -13 0 0 2 58 12 30 314 -57 - 56 3 28 - 55 1 36 - 58 13 20 - 52 40 50 - 55 12 55 -12 0 0 2 57 57 30 314 -58 - 55 43 46 - 54 41 41 - 57 53 58 - 52 20 23 - 54 51 22 -11 0 0 2 57 43 31 313 -59 - 55 22 20 - 54 20 0 - 57 33 2 - 51 58 0 - 54 28 3 -10 0 0 2 57 27 31 313 -60 - 54 59 11 - 53 56 31 - 57 10 30 - 51 33 37 - 54 2 56 - 9 0 0 2 57 12 32 312 -61 - 54 34 16 - 53 31 10 - 56 46 21 - 51 7 12 - 53 35 56 - 8 0 0 2 56 56 32 311 -62 - 54 7 30 - 53 3 55 - 56 20 31 - 50 38 40 - 53 7 1 - 7 0 0 2 56 40 32 311 -63 - 53 38 53 - 52 34 43 - 55 52 58 - 50 7 57 - 52 36 7 - 6 0 0 2 56 24 33 310 -64 - 53 8 18 - 52 3 27 - 55 23 38 - 49 34 56 - 52 3 8 - 5 0 0 2 56 7 33 309 -65 - 52 35 42 - 51 30 5 - 54 52 29 - 48 59 32 - 51 27 58 - 4 0 0 2 55 50 33 308 -66 - 52 0 58 - 50 54 28 - 54 19 25 - 48 21 36 - 50 50 32 - 3 0 0 2 55 33 33 308 -68 - 51 24 2 - 50 16 30 - 53 44 21 - 47 40 59 - 50 10 41 - 2 0 0 2 55 15 34 307 -69 - 50 44 45 - 49 36 4 - 53 7 12 - 46 57 29 - 49 28 17 - 1 0 0 2 54 57 34 306 -70 - 50 2 58 - 48 52 59 - 52 27 51 - 46 10 55 - 48 43 7 0 0 0 2 54 38 34 305 -71 - 49 18 32 - 48 7 3 - 51 46 9 - 45 20 59 - 47 55 1 1 0 0 2 54 19 34 304 -72 - 48 31 15 - 47 18 4 - 51 1 59 - 44 27 22 Latitude Latitude Latitude Latitude - 47 0 0 2 4 11 2 53 58 34 304 -74 2 46 1 1 21 10 5 36 54 - 2 3 21 - 46 0 0 3 9 21 2 53 36 33 303 -75 3 49 34 2 28 6 6 34 37 - 0 46 32 - 45 0 0 4 10 1 2 53 15 33 302 -76 4 48 50 3 30 16 7 28 43 0 24 0 - 44 0 0 5 6 35 2 52 55 33 301 -77 5 44 10 4 28 10 8 19 30 1 29 2 - 43 0 0 5 59 26 2 52 36 33 300 -78 6 35 55 5 22 10 9 7 12 2 29 12 - 42 0 0 6 48 50 2 52 18 32 300 -79 7 24 21 6 12 36 9 52 0 3 25 2 - 41 0 0 7 35 3 2 52 0 32 299 -80 8 9 43 6 59 44 10 34 5 4 16 54 - 40 0 0 8 18 17 2 51 43 31 299 -81 8 52 10 7 43 47 11 13 36 5 5 10 - 39 0 0 8 58 44 2 51 27 31 298 -82 9 31 55 8 24 57 11 50 41 5 50 5 - 38 0 0 9 36 32 2 51 11 30 298 -82 10 9 6 9 3 25 12 25 27 6 31 53 - 37 0 0 10 11 51 2 50 56 30 297 -83 10 43 51 9 39 20 12 58 1 7 10 47 - 36 0 0 10 44 48 2 50 41 29 297 -83 11 16 17 10 12 49 13 28 28 7 46 57 - 35 0 0 11 15 28 2 50 27 29 297 -83 11 46 30 10 43 58 13 56 53 8 20 31 - 34 0 0 11 43 58 2 50 13 28 296 -83 12 14 35 11 12 55 14 23 20 8 51 37 - 33 0 0 12 10 23 2 50 0 27 296 -82 12 40 38 11 39 43 14 47 54 9 20 22 - 32 0 0 12 34 47 2 49 47 27 296 -82 13 4 41 12 4 28 15 10 37 9 46 51 - 31 0 0 12 57 14 2 49 35 26 296 -81 13 26 50 12 27 14 15 31 34 10 11 10 - 30 0 0 13 17 48 2 49 23 25 296 -81 13 47 7 12 48 5 15 50 47 10 33 24 - 29 0 0 13 36 31 2 49 11 25 296 -80 14 5 36 13 7 3 16 8 18 10 53 35 - 28 0 0 13 53 26 2 49 0 24 296 -79 14 22 18 13 24 11 16 24 10 11 11 48 - 27 0 0 14 8 36 2 48 50 23 296 -78 14 37 17 13 39 32 16 38 25 11 28 5 - 26 0 0 14 22 2 2 48 39 22 296 -77 14 50 34 13 53 9 16 51 4 11 42 29 - 25 0 0 14 33 47 2 48 29 22 296 -77 15 2 10 14 5 1 17 2 8 11 55 2 - 24 0 0 14 43 51 2 48 20 21 296 -76 15 12 8 14 15 12 17 11 40 12 5 45 - 23 0 0 14 52 15 2 48 11 20 296 -75 15 20 27 14 23 42 17 19 39 12 14 41 - 22 0 0 14 59 2 2 48 2 19 296 -74 15 27 10 14 30 32 17 26 7 12 21 49 - 21 0 0 15 4 10 2 47 53 19 296 -73 15 32 16 14 35 43 17 31 4 12 27 11 - 20 0 0 15 7 41 2 47 45 18 296 -72 15 35 46 14 39 15 17 34 30 12 30 47 - 19 0 0 15 9 35 2 47 37 17 296 -71 15 37 40 14 41 8 17 36 25 12 32 38 - 18 0 0 15 9 51 2 47 30 16 296 -70 15 37 58 14 41 22 17 36 50 12 32 42 - 17 0 0 15 8 29 2 47 23 15 296 -69 15 36 40 14 39 57 17 35 44 12 31 0 - 16 0 0 15 5 28 2 47 16 14 296 -68 15 33 44 14 36 51 17 33 7 12 27 31 - 15 0 0 15 0 48 2 47 10 13 297 -67 15 29 10 14 32 5 17 28 57 12 22 13 - 14 0 0 14 54 27 2 47 4 13 297 -66 15 22 57 14 25 36 17 23 14 12 15 5 - 13 0 0 14 46 24 2 46 58 12 297 -66 15 15 3 14 17 24 17 15 57 12 6 5 - 12 0 0 14 36 37 2 46 53 11 297 -65 15 5 27 14 7 25 17 7 3 11 55 11 - 11 0 0 14 25 4 2 46 48 10 297 -64 14 54 6 13 55 39 16 56 32 11 42 20 - 10 0 0 14 11 42 2 46 44 9 297 -63 14 40 58 13 42 1 .. .. .. 11 27 29 - 9 0 0 13 56 28 2 46 40 8 298 -62 14 26 1 13 26 30 .. .. .. 11 10 34 - 8 0 0 13 39 19 2 46 36 7 298 -61 14 9 10 13 9 2 .. .. .. 10 51 30 - 7 0 0 13 20 11 2 46 33 6 298 -60 13 50 23 12 49 33 .. .. .. 10 30 14 - 6 0 0 12 59 0 2 46 30 5 298 -59 13 29 35 12 27 57 .. .. .. 10 6 38 - 5 0 0 12 35 41 2 46 28 4 299 -58 13 6 42 12 4 11 .. .. .. 9 40 36 - 4 0 0 12 10 7 2 46 26 3 299 -57 12 41 37 11 38 8 .. .. .. 9 12 2 - 3 0 0 11 42 14 2 46 25 2 299 -56 .. .. .. 11 9 40 .. .. .. 8 40 45 - 2 0 0 11 11 52 2 46 25 1 299 -54 .. .. .. 10 38 41 .. .. .. .. .. .. Data for the target star ------------------------ * name: 2UCAC 41843807 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 02 51.4873 DE: +28 39 46.746 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .032 ) * V mag [mag]: 11.2 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 75.8486086752 DE(deg): 28.6771881648 * Equation of equinoxes (radians) : 0.000044671489583 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3614) Tumilty approx. diameter [km]: 58 approx. diameter ["]: .031 distance from Earth [AU]: 2.61400 * orbital information: orbit source: Preston date of fit: 2007 Dec 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 518 number of rejected observations: 6 time covered by the observations: 1952 Feb 26 - 2007 Nov 17 1 sigma uncertainty ellipse (major, minor, PA): 0.063, 0.034, 100° remarks: * orbital elements for (3614) Tumilty : Mean anomaly = 225.17488920 deg Arg. of pericenter = 307.77983800 deg Long. of node = 287.56662145 deg Inclination = 16.65034914 deg Eccentricity = 0.12982902 Semimajor axis = 2.98242452 AU Perihelion dist = 2.59521927 AU Mag: H = 10.51, G = 0.15 Epoch of elements : MJD 54498.12100000 TDT (2008 Feb 02.121) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 02 3614 Tumilty 2h 54.6m UT 11.2 5 2 51.487 28 39 46.752UCAC 41843807 0.0 16.2 58 8.1 2.614 -0.375 -12.69 -99.633 28.666 139.75 -17.02 2.9105 .77477 -.30332 -1.47287 -3.77466 0.00496 0.00014 2000 223.6208592008 125.00000307.779838287.566621 16.6503490.129829022.982424522.5952192710.75 0.15 RATE 1.9135940 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.069 0.047 98.4 3.180 0.067 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 22, 20:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org