IOTA/IOTA-ES occultation update for (6025) Naotosato / TYC 1192-01508-1 event on 2012 Aug 23, 08:10 UT Visible from Brazil, Ecuador Summary ------- On 2012 Aug 23 UT, the 20 km diameter asteroid (6025) Naotosato will occult a 9.1 mag star in the constellation Pisces for observers along a path across Brazil, Ecuador. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.2 mag to 16.3 mag (the magnitude of the asteroid) for at most 4.3 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 13 * date and approx. time of event: 2012 Aug 23, 07:48 - 2012 Aug 23, 08:33 UT * geocentric midpoint of event [JD]: 2456162.84084583 * magnitude of target star: 9.1 * magnitude drop [mag]: 7.2 * estimated maximum duration [s]: 4.3 * Moon: 35 % sunlit, 154° distance * Sun: 130° distance * rough path description: Brazil, Ecuador The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 5.20 * 1 sigma uncertainty interval [seconds]: +/- 18.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .068 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .070", .047", 71° ) * approx speed of asteroid's shadow [km/s]: 4.6157 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1192-01508-1 by 6025 Naotosato on 2012 Aug 23 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 Latitude Latitude Latitude Latitude - 16 0 0 -44 24 5 7 48 47 7 305 0 -44 17 21 -44 30 48 -43 7 40 -45 41 4 - 17 0 0 -43 56 5 7 48 50 8 305 -1 -43 49 19 -44 2 50 -42 39 18 -45 13 27 - 18 0 0 -43 27 24 7 48 53 8 306 -2 -43 20 37 -43 34 12 -42 10 15 -44 45 10 - 19 0 0 -42 58 4 7 48 56 9 307 -2 -42 51 14 -43 4 53 -41 40 32 -44 16 13 - 20 0 0 -42 28 2 7 49 0 10 308 -3 -42 21 11 -42 34 54 -41 10 9 -43 46 35 - 21 0 0 -41 57 21 7 49 4 11 308 -3 -41 50 27 -42 4 14 -40 39 5 -43 16 15 - 22 0 0 -41 25 58 7 49 8 12 309 -4 -41 19 3 -41 32 54 -40 7 21 -42 45 15 - 23 0 0 -40 53 55 7 49 13 13 309 -5 -40 46 58 -41 0 53 -39 34 57 -42 13 34 - 24 0 0 -40 21 12 7 49 18 14 310 -5 -40 14 13 -40 28 11 -39 1 53 -41 41 12 - 25 0 0 -39 47 48 7 49 24 15 311 -6 -39 40 48 -39 54 50 -38 28 9 -41 8 10 - 26 0 0 -39 13 45 7 49 30 16 311 -7 -39 6 42 -39 20 48 -37 53 46 -40 34 27 - 27 0 0 -38 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20 56 47 8 33 0 3 71 -29 21 2 45 20 50 50 .. .. .. 19 48 38 178 0 0 20 37 40 8 33 1 2 70 -28 20 43 39 20 31 41 .. .. .. 19 29 13 177 0 0 20 17 48 8 33 2 1 70 -27 20 23 48 20 11 47 .. .. .. 19 9 3 Uncertainty in time = +/- 24 secs Prediction of 2012 Apr 8.0 Data for the target star ------------------------ * name: TYC 1192-01508-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 54 06.8286 DE: +18 50 36.959 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .021 ) * V mag [mag]: 9.1 * B mag [mag]: 9.6 * Apparent position with proper motion RA(deg): 13.7046780017 DE(deg): 18.9141033484 * Equation of equinoxes (radians) : 0.000070829540817 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6025) Naotosato approx. diameter [km]: 20 approx. diameter ["]: .012 distance from Earth [AU]: 2.21700 * orbital information: orbit source: Preston date of fit: 2012 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 844 number of rejected observations: 11 time covered by the observations: 1954 Sep 27 - 2011 Jun 24 1 sigma uncertainty ellipse (major, minor, PA): 0.066, 0.042, 69° remarks: * orbital elements for (6025) Naotosato : Mean anomaly = 289.42663935 deg Arg. of pericenter = 162.65737007 deg Long. of node = 280.28908578 deg Inclination = 9.00162716 deg Eccentricity = 0.06922173 Semimajor axis = 3.02096803 AU Perihelion dist = 2.81185138 AU Mag: H = 11.38, G = 0.15 Epoch of elements : MJD 56162.34100000 TDT (2012 Aug 23.341) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 23 6025 Naotosato 8h 10.8m UT 9.1 0 54 6.829 18 50 36.96TYC 1192-01508-1 9.6 16.3 20 4.3 2.217 -0.588 6.10 -81.2031 18.842 57.94 11.26 8.1803 -0.15437 -0.21003 -2.10065 1.54092 -0.00363 -0.00240 2000 288.9872122012 821.00000162.657370280.289086 9.0016270.06922173 3.0209680 2.811851411.4 5.00.15 RATE 1.8770900 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.070 0.047 71 6.20 0.065 0 0-4-1 056025.0020120823_1508-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 03, 01:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org