IOTA/IOTA-ES occultation update for (1408) Trusanda / HIP 682 event on 2012 Sep 06, 00:58 UT Visible from Madagascar, S Africa Summary ------- On 2012 Sep 06 UT, the 36 km diameter asteroid (1408) Trusanda will occult a 7.6 mag star in the constellation Pisces for observers along a path across Madagascar, S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.8 mag to 15.4 mag (the magnitude of the asteroid) for at most 3.6 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: 51 * date and approx. time of event: 2012 Sep 06, 00:51 - 2012 Sep 06, 01:06 UT * geocentric midpoint of event [JD]: 2456176.54097917 * magnitude of target star: 7.6 * magnitude drop [mag]: 7.8 * estimated maximum duration [s]: 3.6 * Moon: 73 % sunlit, 42° distance * Sun: 158° distance * rough path description: Madagascar, S Africa The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 1.24 * 1 sigma uncertainty interval [seconds]: +/- 7.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .029", 75° ) * approx speed of asteroid's shadow [km/s]: 9.8650 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 682 by 1408 Trusanda on 2012 Sep 6 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 - 57 41 8 -77 0 0 1 6 31 0 57 -16 ... .. .. - 55 47 56 ... .. .. - 51 22 6 - 51 28 55 -76 0 0 1 6 30 2 51 -18 - 53 6 31 - 49 53 41 ... .. .. - 46 6 15 Latitude Latitude Latitude Latitude - 51 0 0 -75 54 44 1 6 30 2 51 -18 -75 37 20 -76 12 15 -74 54 39 -76 56 10 - 50 0 0 -75 43 31 1 6 30 3 50 -18 -75 25 58 -76 1 11 -74 42 55 -76 45 31 - 49 0 0 -75 31 54 1 6 30 3 49 -19 -75 14 11 -75 49 43 -74 30 46 -76 34 27 - 48 0 0 -75 19 50 1 6 29 3 48 -19 -75 1 58 -75 37 49 -74 18 10 -76 22 58 - 47 0 0 -75 7 20 1 6 29 4 47 -19 -74 49 18 -75 25 29 -74 5 7 -76 11 3 - 46 0 0 -74 54 22 1 6 29 4 46 -19 -74 36 11 -75 12 41 -73 51 36 -75 58 41 - 45 0 0 -74 40 56 1 6 28 4 45 -20 -74 22 35 -74 59 26 -73 37 36 -75 45 52 - 44 0 0 -74 27 1 1 6 28 5 44 -20 -74 8 30 -74 45 41 -73 23 7 -75 32 34 - 43 0 0 -74 12 36 1 6 27 5 43 -20 -73 53 54 -74 31 26 -73 8 7 -75 18 46 - 42 0 0 -73 57 39 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5 20 -18 49 51 54 0 0 -17 33 33 0 54 31 34 291 -23 -17 18 39 -17 48 32 -16 41 59 -18 25 59 55 0 0 -17 10 42 0 54 22 34 290 -22 -16 55 52 -17 25 37 -16 19 23 -18 2 53 56 0 0 -16 48 37 0 54 13 33 290 -21 -16 33 51 -17 3 27 -15 57 32 -17 40 33 57 0 0 -16 27 18 0 54 5 32 289 -20 -16 12 36 -16 42 4 -15 36 26 -17 18 59 58 0 0 -16 6 44 0 53 56 31 288 -19 -15 52 6 -16 21 26 -15 16 5 -16 58 12 59 0 0 -15 46 56 0 53 48 30 288 -18 -15 32 22 -16 1 35 -14 56 30 -16 38 11 60 0 0 -15 27 54 0 53 40 30 287 -17 -15 13 23 -15 42 29 -14 37 40 -16 18 57 61 0 0 -15 9 39 0 53 33 29 287 -16 -14 55 11 -15 24 10 -14 19 35 -16 0 29 62 0 0 -14 52 9 0 53 25 28 286 -15 -14 37 45 -15 6 38 -14 2 17 -15 42 49 63 0 0 -14 35 26 0 53 18 27 286 -14 -14 21 4 -14 49 52 -13 45 43 -15 25 55 64 0 0 -14 19 29 0 53 11 26 285 -13 -14 5 10 -14 33 52 -13 29 56 -15 9 48 65 0 0 -14 4 19 0 53 4 26 285 -12 -13 50 3 -14 18 39 -13 14 55 -14 54 28 66 0 0 -13 49 55 0 52 57 25 284 -12 -13 35 41 -14 4 12 -13 0 39 -14 39 55 67 0 0 -13 36 17 0 52 51 24 284 -11 -13 22 6 -13 50 32 -12 47 10 -14 26 9 68 0 0 -13 23 26 0 52 44 23 283 -10 -13 9 17 -13 37 39 -12 34 26 -14 13 10 69 0 0 -13 11 22 0 52 38 22 283 -9 -12 57 15 -13 25 33 -12 22 29 -14 0 59 70 0 0 -13 0 5 0 52 33 21 283 -8 -12 45 59 -13 14 14 -12 11 18 -13 49 35 71 0 0 -12 49 34 0 52 27 20 282 -7 -12 35 31 -13 3 41 -12 0 53 -13 38 58 72 0 0 -12 39 50 0 52 22 19 282 -6 -12 25 48 -12 53 56 -11 51 15 -13 29 9 73 0 0 -12 30 54 0 52 17 19 282 -5 -12 16 53 -12 44 58 -11 42 23 -13 20 7 74 0 0 -12 22 44 0 52 12 18 281 -4 -12 8 45 -12 36 47 -11 34 18 -13 11 53 75 0 0 -12 15 21 0 52 7 17 281 -3 -12 1 23 -12 29 23 -11 26 59 -13 4 26 76 0 0 -12 8 46 0 52 3 16 281 -2 -11 54 49 -12 22 47 -11 20 27 -12 57 48 77 0 0 -12 2 58 0 51 59 15 280 -1 -11 49 2 -12 16 58 -11 14 42 -12 51 57 Uncertainty in time = +/- 8 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: HIP 682 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 08 25.8213 DE: +06 37 00.483 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .014, .008 ) * V mag [mag]: 7.6 * B mag [mag]: 8.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1408) Trusanda approx. diameter [km]: 36 approx. diameter ["]: .026 distance from Earth [AU]: 1.90600 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1097 number of rejected observations: 28 time covered by the observations: 1936 Nov 23 - 2012 Aug 13 1 sigma uncertainty ellipse (major, minor, PA): 0.052, 0.028, 74° remarks: * orbital elements for (1408) Trusanda : Mean anomaly = 332.29279704 deg Arg. of pericenter = 188.35620929 deg Long. of node = 201.79102520 deg Inclination = 8.34781503 deg Eccentricity = 0.09000493 Semimajor axis = 3.10858106 AU Perihelion dist = 2.82879344 AU Mag: H = 11.17, G = 0.15 Epoch of elements : MJD 56176.04100000 TDT (2012 Sep 06.041) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 6 1408 Trusanda 0h 59.0m UT 7.6 0 8 25.821 6 37 0.48HIP 682 8.2 15.4 36 3.6 1.906 -1.443 -14.10 1.8236 6.620 164.84 6.35 0.9835 0.39123 -0.59650 -4.65601 -3.05367 -0.00168 -0.00126 2000 331.2064472012 831.00000188.356209201.791025 8.3478150.09000493 3.1085811 2.828793411.2 5.00.15 RATE 1.7982950 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.029 75 2.24 0.032 0 0 3 3 456165.0020120906____682 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org