IOTA/IOTA-ES occultation update for (1236) Thais / TYC 1278-00021-2 event on 2007 Aug 05, 02:04 UT Visible from Arabia, Africa Summary ------- On 2007 Aug 05 UT, the 22 km diameter asteroid (1236) Thais will occult a 10.5 mag star in the constellation Taurus for observers along a path across Arabia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.8 mag to 16.3 mag (the magnitude of the asteroid) for at most 0.7 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: UCAC. The event at a glimpse ---------------------- * Rank: 38 * date and approx. time of event: 2007 Aug 05, 02:02 - 2007 Aug 05, 02:08 UT * midpoint of event [JD]: 2454317.58700833 * magnitude of target star: 10.5 * magnitude drop [mag]: 5.8 * estimated maximum duration [s]: 0.7 * Moon: 59 % sunlit, 39° distance * Sun: 62° distance * rough path description: Arabia, Africa Additional comments ------------------- 2" double star. The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 1.74 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .022", 85° ) * approx speed of asteroid's shadow [km/s]: 32.2966 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1278-00021-2 by 1236 Thais on 2007 Aug 05 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 - 6 0 0 5 19 11 2 2 15 0 69 -58 5 12 15 5 26 7 .. .. .. 5 50 20 - 5 0 0 5 42 51 2 2 15 2 69 -57 5 35 54 5 49 49 .. .. .. 6 14 4 - 4 0 0 6 6 55 2 2 15 3 69 -56 5 59 57 6 13 54 .. .. .. 6 38 13 - 3 0 0 6 31 24 2 2 15 4 69 -55 6 24 24 6 38 23 .. .. .. 7 2 46 - 2 0 0 6 56 15 2 2 15 5 69 -54 6 49 15 7 3 16 6 24 56 7 27 42 - 1 0 0 7 21 29 2 2 16 6 69 -53 7 14 28 7 28 31 6 50 5 7 53 1 0 0 0 7 47 6 2 2 16 7 70 -52 7 40 4 7 54 9 7 15 38 8 18 43 1 0 0 8 13 5 2 2 17 8 70 -51 8 6 2 8 20 8 7 41 32 8 44 46 2 0 0 8 39 25 2 2 17 9 70 -50 8 32 20 8 46 29 8 7 47 9 11 10 3 0 0 9 6 5 2 2 18 10 70 -49 8 59 0 9 13 11 8 34 23 9 37 55 4 0 0 9 33 6 2 2 19 11 70 -48 9 26 0 9 40 13 9 1 20 10 5 0 5 0 0 10 0 26 2 2 20 12 70 -47 9 53 19 10 7 34 9 28 36 10 32 25 6 0 0 10 28 5 2 2 21 13 71 -46 10 20 57 10 35 14 9 56 10 11 0 8 7 0 0 10 56 2 2 2 22 14 71 -45 10 48 53 11 3 12 10 24 3 11 28 10 8 0 0 11 24 17 2 2 23 16 71 -44 11 17 7 11 31 28 10 52 14 11 56 29 9 0 0 11 52 49 2 2 24 17 71 -43 11 45 38 12 0 0 11 20 41 12 25 5 10 0 0 12 21 36 2 2 25 18 72 -41 12 14 25 12 28 49 11 49 25 12 53 56 11 0 0 12 50 39 2 2 26 19 72 -40 12 43 27 12 57 53 12 18 24 13 23 3 12 0 0 13 19 57 2 2 28 20 72 -39 13 12 43 13 27 11 12 47 38 13 52 24 13 0 0 13 49 28 2 2 29 21 72 -38 13 42 14 13 56 43 13 17 5 14 22 0 14 0 0 14 19 12 2 2 30 22 73 -37 14 11 57 14 26 28 13 46 46 14 51 47 15 0 0 14 49 9 2 2 32 23 73 -36 14 41 53 14 56 25 14 16 39 15 21 47 16 0 0 15 19 16 2 2 34 24 73 -35 15 12 0 15 26 33 14 46 43 15 51 58 17 0 0 15 49 34 2 2 35 25 74 -34 15 42 17 15 56 52 15 16 58 16 22 19 18 0 0 16 20 2 2 2 37 26 74 -33 16 12 44 16 27 20 15 47 22 16 52 50 19 0 0 16 50 38 2 2 39 27 75 -32 16 43 19 16 57 57 16 17 55 17 23 29 20 0 0 17 21 22 2 2 41 28 75 -31 17 14 2 17 28 42 16 48 36 17 54 16 21 0 0 17 52 12 2 2 43 30 75 -30 17 44 52 17 59 33 17 19 24 18 25 9 22 0 0 18 23 9 2 2 45 31 76 -28 18 15 48 18 30 30 17 50 18 18 56 8 23 0 0 18 54 10 2 2 47 32 76 -27 18 46 49 19 1 32 18 21 18 19 27 12 24 0 0 19 25 16 2 2 49 33 77 -26 19 17 54 19 32 38 18 52 21 19 58 20 25 0 0 19 56 24 2 2 51 34 77 -25 19 49 2 20 3 47 19 23 27 20 29 30 26 0 0 20 27 35 2 2 54 35 78 -24 20 20 13 20 34 58 19 54 36 21 0 43 27 0 0 20 58 47 2 2 56 36 79 -23 20 51 24 21 6 10 20 25 46 21 31 56 28 0 0 21 29 59 2 2 58 37 79 -22 21 22 36 21 37 22 20 56 57 22 3 9 29 0 0 22 1 10 2 3 1 38 80 -21 21 53 46 22 8 34 21 28 7 22 34 22 30 0 0 22 32 19 2 3 3 39 80 -20 22 24 56 22 39 43 21 59 15 23 5 32 31 0 0 23 3 26 2 3 6 40 81 -19 22 56 2 23 10 50 22 30 21 23 36 40 32 0 0 23 34 29 2 3 8 41 82 -18 23 27 5 23 41 54 23 1 24 24 7 44 33 0 0 24 5 28 2 3 11 42 83 -17 23 58 4 24 12 52 23 32 22 24 38 43 34 0 0 24 36 21 2 3 14 43 83 -16 24 28 57 24 43 46 24 3 15 25 9 36 35 0 0 25 7 8 2 3 16 44 84 -15 24 59 44 25 14 32 24 34 1 25 40 23 36 0 0 25 37 47 2 3 19 45 85 -14 25 30 23 25 45 12 25 4 41 26 11 3 37 0 0 26 8 19 2 3 22 46 86 -12 26 0 55 26 15 43 25 35 13 26 41 34 38 0 0 26 38 41 2 3 25 47 87 -11 26 31 17 26 46 5 26 5 36 27 11 55 39 0 0 27 8 54 2 3 27 48 88 -10 27 1 30 27 16 18 26 35 49 27 42 7 40 0 0 27 38 55 2 3 30 48 89 -9 27 31 32 27 46 19 27 5 52 28 12 8 41 0 0 28 8 46 2 3 33 49 90 -8 28 1 22 28 16 10 27 35 43 28 41 57 42 0 0 28 38 24 2 3 36 50 91 -7 28 31 1 28 45 47 28 5 23 29 11 34 43 0 0 29 7 49 2 3 39 51 92 -6 29 0 26 29 15 12 28 34 49 29 40 57 44 0 0 29 37 0 2 3 42 52 93 -5 29 29 38 29 44 23 29 4 2 30 10 7 45 0 0 30 5 57 2 3 45 53 94 -4 29 58 35 30 13 19 29 33 1 30 39 2 46 0 0 30 34 38 2 3 48 54 95 -3 30 27 17 30 42 0 30 1 44 31 7 41 47 0 0 31 3 4 2 3 51 54 97 -2 30 55 43 31 10 25 30 30 12 31 36 4 48 0 0 31 31 13 2 3 54 55 98 -1 31 23 52 31 38 34 30 58 23 32 4 11 49 0 0 31 59 5 2 3 57 56 99 0 31 51 45 32 6 25 31 26 18 32 32 0 50 0 0 32 26 39 2 4 0 57 101 1 32 19 20 32 33 59 31 53 55 32 59 32 51 0 0 32 53 55 2 4 3 58 102 1 32 46 37 33 1 14 32 21 14 33 26 45 52 0 0 33 20 52 2 4 6 58 104 2 33 13 34 33 28 10 32 48 14 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2 8 11 16 284 58 42 43 29 42 57 16 42 19 33 43 21 18 172 0 0 42 33 20 2 8 12 15 285 58 42 26 26 42 40 15 42 2 27 43 4 21 173 0 0 42 15 55 2 8 13 15 285 58 42 8 59 42 22 50 41 44 57 42 47 0 174 0 0 41 58 6 2 8 14 14 286 57 41 51 9 42 5 2 41 27 3 42 29 15 175 0 0 41 39 53 2 8 14 13 287 57 41 32 56 41 46 51 41 8 46 42 11 8 176 0 0 41 21 17 2 8 15 12 287 57 41 14 19 41 28 16 40 50 6 41 52 36 177 0 0 41 2 18 2 8 16 11 288 56 40 55 19 41 9 18 40 31 2 41 33 42 178 0 0 40 42 56 2 8 16 11 289 56 40 35 55 40 49 57 40 11 35 41 14 24 179 0 0 40 23 10 2 8 17 10 289 55 40 16 9 40 30 12 39 51 45 40 54 43 180 0 0 40 3 1 2 8 17 9 290 55 39 55 59 40 10 4 39 31 32 40 34 38 -179 0 0 39 42 29 2 8 18 8 291 55 39 35 26 39 49 33 39 10 55 40 14 11 -178 0 0 39 21 34 2 8 18 7 291 54 39 14 30 39 28 39 38 49 56 39 53 20 -177 0 0 39 0 16 2 8 19 6 292 54 38 53 11 39 7 22 38 28 34 39 32 6 -176 0 0 38 38 35 2 8 19 6 293 53 38 31 29 38 45 42 38 6 49 39 10 30 -175 0 0 38 16 32 2 8 19 5 293 52 38 9 25 38 23 40 37 44 41 38 48 31 -174 0 0 37 54 7 2 8 19 4 294 52 37 46 58 38 1 15 37 22 12 38 26 10 -173 0 0 37 31 19 2 8 20 3 294 51 37 24 10 37 38 28 36 59 20 38 3 26 -172 0 0 37 8 9 2 8 20 2 295 51 37 0 59 37 15 19 .. .. .. 37 40 20 -171 0 0 36 44 38 2 8 20 1 296 50 36 37 27 36 51 49 .. .. .. 37 16 53 -170 0 0 36 20 45 2 8 20 0 296 49 36 13 33 36 27 57 .. .. .. 36 53 4 Data for the target star ------------------------ * name: TYC 1278-00021-2 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 36 55.9616 DE: +21 02 48.798 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .034, .020 ) * V mag [mag]: 10.5 * B mag [mag]: 11.3 * Apparent position with proper motion RA(deg): 69.3446434044 DE(deg): 21.0640330992 * Equation of equinoxes (radians) : 0.000032024978991 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1236) Thais approx. diameter [km]: 22 approx. diameter ["]: .013 distance from Earth [AU]: 2.24700 * orbital information: orbit source: Preston date of fit: 2007 Apr 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 642 number of rejected observations: 21 time covered by the observations: 1931 Nov 10 - 2006 Sep 04 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.010, 65° remarks: * orbital elements for (1236) Thais : Mean anomaly = 30.61119574 deg Arg. of pericenter = 305.67425890 deg Long. of node = 48.74997936 deg Inclination = 13.15648178 deg Eccentricity = 0.24218472 Semimajor axis = 2.43057179 AU Perihelion dist = 1.84192445 AU Mag: H = 11.76, G = 0.15 Epoch of elements : MJD 54317.08600000 TDT (2007 Aug 05.086) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 05 1236 Thais 2h 5.3m UT 10.5 4 36 55.962 21 2 48.80TYC 1278-00021-2 11.3 16.3 22 0.7 2.247 4.879 20.61 -275.343 21.042 -209.80 17.11 2.0882 -.10910 .36298 17.45164 5.26683 -0.00438 -0.00067 2000 28.76812302007 729.00000305.674259 48.749979 13.1564820.242184722.430571791.8419244511.95 0.15 RATE 2.6010062 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.038 0.022 84.7 2.740 0.023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 09, 20:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org