IOTA/IOTA-ES occultation update for (3447) Burckhalter / TYC 7497-01512-1 event on 2012 Aug 25, 06:23 UT Visible from Argentina, Chile Summary ------- On 2012 Aug 25 UT, the 13 km diameter asteroid (3447) Burckhalter will occult a 7.1 mag star in the constellation Piscis Austrinus for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.3 mag to 14.4 mag (the magnitude of the asteroid) for at most 1.1 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: . The event at a glimpse ---------------------- * Rank: 10 * date and approx. time of event: 2012 Aug 25, 06:14 - 2012 Aug 25, 06:31 UT * geocentric midpoint of event [JD]: 2456164.76587083 * magnitude of target star: 7.1 * magnitude drop [mag]: 7.3 * estimated maximum duration [s]: 1.1 * Moon: 58 % sunlit, 78° distance * Sun: 158° distance * rough path description: Argentina, Chile Additional comments ------------------- 35" double star The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 6.42 * 1 sigma uncertainty interval [seconds]: +/- 5.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .110 +/- .095) * 1 sigma uncertainty ellipse (major, minor, PA): ( .136", .054", 51° ) * approx speed of asteroid's shadow [km/s]: 11.9270 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7497-01512-1 by 3447 Burckhalter on 2012 Aug 25 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 179 0 0 3 0 49 6 31 40 1 122 -6 3 5 2 2 56 36 .. .. .. 2 2 26 180 0 0 2 22 16 6 31 40 2 122 -7 2 26 29 2 18 3 .. .. .. 1 23 46 -179 0 0 1 43 25 6 31 40 3 122 -8 1 47 39 1 39 12 2 41 54 0 44 48 -178 0 0 1 4 18 6 31 39 4 122 -9 1 8 32 1 0 4 2 2 53 0 5 34 -177 0 0 0 24 55 6 31 38 6 123 -10 0 29 10 0 20 41 1 23 37 - 0 33 55 -176 0 0 - 0 14 41 6 31 37 7 123 -11 - 0 10 26 - 0 18 57 0 44 6 - 1 13 38 -175 0 0 - 0 54 31 6 31 35 8 122 -12 - 0 50 15 - 0 58 46 0 4 22 - 1 53 33 -174 0 0 - 1 34 32 6 31 34 9 122 -13 - 1 30 16 - 1 38 48 - 0 35 33 - 2 33 39 -173 0 0 - 2 14 43 6 31 32 10 122 -15 - 2 10 27 - 2 18 59 - 1 15 40 - 3 13 55 -172 0 0 - 2 55 3 6 31 30 11 122 -16 - 2 50 46 - 2 59 20 - 1 55 56 - 3 54 19 -171 0 0 - 3 35 30 6 31 27 13 122 -17 - 3 31 14 - 3 39 47 - 2 36 19 - 4 34 51 -170 0 0 - 4 16 4 6 31 25 14 122 -18 - 4 11 47 - 4 20 21 - 3 16 49 - 5 15 27 -169 0 0 - 4 56 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33 34 - 11 0 0 -30 10 42 6 14 50 24 245 -12 -30 6 40 -30 14 43 -29 15 9 -31 6 22 - 10 0 0 -29 42 45 6 14 47 23 245 -11 -29 38 43 -29 46 47 -28 47 1 -30 38 37 - 9 0 0 -29 14 16 6 14 43 22 244 -10 -29 10 13 -29 18 18 -28 18 21 -30 10 19 - 8 0 0 -28 45 13 6 14 40 21 244 -9 -28 41 10 -28 49 17 -27 49 7 -29 41 28 - 7 0 0 -28 15 38 6 14 36 20 243 -8 -28 11 34 -28 19 43 -27 19 21 -29 12 4 - 6 0 0 -27 45 31 6 14 33 19 243 -7 -27 41 26 -27 49 36 -26 49 3 -28 42 7 - 5 0 0 -27 14 51 6 14 30 18 242 -6 -27 10 45 -27 18 57 -26 18 12 -28 11 38 - 4 0 0 -26 43 38 6 14 27 17 242 -6 -26 39 32 -26 47 45 -25 46 49 -27 40 36 - 3 0 0 -26 11 54 6 14 24 16 242 -5 -26 7 47 -26 16 1 -25 14 54 -27 9 3 - 2 0 0 -25 39 38 6 14 21 15 241 -4 -25 35 30 -25 43 46 -24 42 27 -26 36 57 - 1 0 0 -25 6 51 6 14 19 14 241 -3 -25 2 42 -25 11 0 -24 9 29 -26 4 21 0 0 0 -24 33 32 6 14 17 13 240 -2 -24 29 23 -24 37 42 -23 36 1 -25 31 12 1 0 0 -23 59 44 6 14 14 12 240 -1 -23 55 33 -24 3 54 -23 2 2 -24 57 34 Uncertainty in time = +/- 9 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 7497-01512-1 * constellation : Piscis Austrinus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 31 30.7020 DE: -32 21 16.158 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .036, .030 ) * V mag [mag]: 7.1 * B mag [mag]: 7.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3447) Burckhalter approx. diameter [km]: 13 approx. diameter ["]: .017 distance from Earth [AU]: 1.07300 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 642 number of rejected observations: 20 time covered by the observations: 1942 Sep 08 - 2012 Jul 17 1 sigma uncertainty ellipse (major, minor, PA): 0.132, 0.046, 48° remarks: * orbital elements for (3447) Burckhalter : Mean anomaly = 161.80934523 deg Arg. of pericenter = 164.48118111 deg Long. of node = 0.73948002 deg Inclination = 20.71708718 deg Eccentricity = 0.02898815 Semimajor axis = 1.99061502 AU Perihelion dist = 1.93291078 AU Mag: H = 12.02, G = 0.15 Epoch of elements : MJD 56164.26600000 TDT (2012 Aug 25.266) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 25 3447 Burckhalter 6h 22.9m UT 7.1 22 31 30.702-32 21 16.16TYC 7497-01512-1 7.7 14.4 13 1.1 1.073 -4.255 11.73 -91.7608 -32.358 84.80 10.59 6.3809 -0.03053 -0.14004 -6.57850 1.42905 -0.00029 0.00192 2000 160.3122682012 821.00000164.481181 0.739480 20.7170870.02898815 1.9906150 1.932910812.0 5.00.15 RATE 3.5093220 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.136 0.054 51 7.42 0.107 0 0 0 2 056129.0020120825_1512-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 14:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org