IOTA/IOTA-ES occultation update for (405) Thia / TYC 6314-01732-1 event on 2007 Apr 26, 02:48 UT Visible from Central Africa Summary ------- On 2007 Apr 26 UT, the 125 km diameter asteroid (405) Thia will occult a 9.1 mag star in the constellation Sagittarius for observers along a path across Central Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.7 mag to 12.8 mag (the magnitude of the asteroid) for at most 8.4 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: 99 * date and approx. time of event: 2007 Apr 26, 02:41 - 2007 Apr 26, 02:54 UT * midpoint of event [JD]: 2454216.6167625 * magnitude of target star: 9.1 * magnitude drop [mag]: 3.7 * estimated maximum duration [s]: 8.4 * Moon: 68 % sunlit, 152° distance * Sun: 96° distance * rough path description: Central Africa The occultation path -------------------- * approximate projected width [km]: 141 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .021", 75° ) * approx speed of asteroid's shadow [km/s]: 14.8739 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6314-01732-1 by 405 Thia on 2007 Apr 26 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 105 30 49 58 0 0 2 54 26 0 238 40 ... .. .. 103 16 56 ... .. .. 102 14 7 102 36 0 57 0 0 2 54 25 2 236 40 104 44 58 100 30 39 105 48 17 99 31 38 Latitude Latitude Latitude Latitude 101 0 0 56 24 51 2 54 25 3 234 39 55 39 9 57 10 56 55 17 21 57 33 12 100 0 0 56 2 4 2 54 25 4 234 39 55 16 6 56 48 25 54 54 11 57 10 49 99 0 0 55 38 38 2 54 24 5 233 39 54 52 25 56 25 15 54 30 22 56 47 47 98 0 0 55 14 33 2 54 24 5 232 39 54 28 4 56 1 26 54 5 54 56 24 5 97 0 0 54 49 48 2 54 23 6 231 39 54 3 4 55 36 57 53 40 46 55 59 44 96 0 0 54 24 23 2 54 22 7 230 39 53 37 23 55 11 48 53 14 58 55 34 43 95 0 0 53 58 17 2 54 22 7 229 38 53 11 1 54 45 58 52 48 29 55 9 1 94 0 0 53 31 29 2 54 21 8 229 38 52 43 58 54 19 26 52 21 18 54 42 37 93 0 0 53 3 59 2 54 20 9 228 38 52 16 12 53 52 12 51 53 25 54 15 31 92 0 0 52 35 46 2 54 19 10 227 38 51 47 44 53 24 15 51 24 50 53 47 42 91 0 0 52 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Data for the target star ------------------------ * name: TYC 6314-01732-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 02 48.3446 DE: -16 03 52.080 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .017 ) * V mag [mag]: 9.1 * B mag [mag]: 9.2 * Apparent position with proper motion RA(deg): 300.8073141737 DE(deg): -16.0458714521 * Equation of equinoxes (radians) : 0.000017712056153 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (405) Thia approx. diameter [km]: 125 approx. diameter ["]: .091 distance from Earth [AU]: 1.88900 * orbital information: orbit source: Preston date of fit: 2007 Mar 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 645 number of rejected observations: 83 time covered by the observations: 1903 Jun 27 - 2006 May 28 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.012, 67° remarks: * orbital elements for (405) Thia : Mean anomaly = 44.32905728 deg Arg. of pericenter = 309.22761849 deg Long. of node = 255.29730630 deg Inclination = 11.95209671 deg Eccentricity = 0.24486814 Semimajor axis = 2.58421163 AU Perihelion dist = 1.95142054 AU Mag: H = 8.44, G = 0.15 Epoch of elements : MJD 54216.11700000 TDT (2007 Apr 26.117) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Apr 26 405 Thia 2h 48.1m UT 9.1 20 2 48.345-16 3 52.08TYC 6314-01732-1 9.2 12.8 125 8.4 1.889 2.249 21.81 44.934 -16.070 -222.55 13.36 2.8023 -.26084 .38931 6.96638 4.68500 -0.00524 -0.00114 2000 42.87777942007 420.00000309.227618255.297306 11.9520970.244868142.584211631.951420548.465 0.15 RATE 2.3725313 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.031 0.021 75.5 1.240 0.022 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Mar 30, 22:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org