IOTA/IOTA-ES occultation update for (345) Tercidina / HIP 12975 event on 2009 Nov 08, 20:53 UT Visible from China, India, SW Asia, Arabia, Africa Summary ------- On 2009 Nov 08 UT, the 108 km diameter asteroid (345) Tercidina will occult a 7.6 mag star in the constellation Aries for observers along a path across China, India, SW Asia, Arabia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.6 mag to 11.1 mag (the magnitude of the asteroid) for at most 10.4 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2009 Nov 08, 20:42 - 2009 Nov 08, 21:03 UT * magnitude of target star: 7.6 * magnitude drop [mag]: 3.6 * estimated maximum duration [s]: 10.4 * Moon: 59 % sunlit, 83° distance * Sun: 175° distance * rough path description: China, India, SW Asia, Arabia, Africa The occultation path -------------------- * approximate projected width [km]: 108 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .021", 84° ) * approx speed of asteroid's shadow [km/s]: 10.3480 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 12975 by 345 Tercidina on 2009 Nov 8 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 - 36 41 7 -33 0 0 21 3 15 6 71 -2 - 38 31 47 - 34 55 48 - 39 17 47 - 34 14 59 Latitude Latitude Latitude Latitude - 36 0 0 -32 48 6 21 3 14 7 71 -2 -32 17 11 -33 19 1 -32 4 48 -33 31 23 - 35 0 0 -32 30 14 21 3 13 7 70 -3 -31 59 13 -33 1 16 -31 46 48 -33 13 40 - 34 0 0 -32 11 48 21 3 12 8 70 -4 -31 40 40 -32 42 55 -31 28 13 -32 55 22 - 33 0 0 -31 52 45 21 3 11 9 69 -5 -31 21 31 -32 23 59 -31 9 2 -32 36 29 - 32 0 0 -31 33 8 21 3 9 10 69 -6 -31 1 47 -32 4 28 -30 49 15 -32 17 0 - 31 0 0 -31 12 54 21 3 7 11 68 -7 -30 41 27 -31 44 21 -30 28 52 -31 56 56 - 30 0 0 -30 52 4 21 3 5 12 68 -8 -30 20 30 -31 23 38 -30 7 53 -31 36 16 - 29 0 0 -30 30 39 21 3 3 13 67 -8 -29 58 58 -31 2 20 -29 46 18 -31 15 0 - 28 0 0 -30 8 37 21 3 1 14 67 -9 -29 36 49 -30 40 25 -29 24 6 -30 53 8 - 27 0 0 -29 45 59 21 2 58 15 66 -10 -29 14 4 -30 17 54 -29 1 18 -30 30 40 - 26 0 0 -29 22 44 21 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129 0 0 37 46 8 20 42 58 11 277 -15 38 15 35 37 16 41 38 27 21 37 4 54 130 0 0 37 39 36 20 42 56 10 278 -14 38 9 5 37 10 6 38 20 53 36 58 19 131 0 0 37 32 32 20 42 55 9 279 -13 38 2 4 37 3 0 38 13 53 36 51 11 132 0 0 37 24 58 20 42 53 8 279 -13 37 54 33 36 55 23 38 6 23 36 43 33 133 0 0 37 16 51 20 42 52 7 280 -12 37 46 29 36 47 13 37 58 21 36 35 22 134 0 0 37 8 13 20 42 51 7 280 -11 37 37 55 36 38 32 37 49 47 36 26 39 135 0 0 36 59 3 20 42 50 6 281 -10 37 28 48 36 29 18 37 40 43 36 17 24 136 0 0 36 49 21 20 42 49 5 282 -9 37 19 10 36 19 32 37 31 6 36 7 37 137 0 0 36 39 7 20 42 49 4 282 -9 37 8 59 36 9 14 37 20 56 35 57 17 138 0 0 36 28 19 20 42 48 3 283 -8 36 58 16 35 58 22 37 10 15 35 46 23 139 0 0 36 16 59 20 42 48 2 283 -7 36 47 0 35 46 57 36 59 0 35 34 57 140 0 0 36 5 5 20 42 47 2 284 -6 36 35 11 35 34 59 36 47 13 35 22 56 141 0 0 35 52 37 20 42 47 1 285 -5 36 22 48 35 22 27 36 34 52 35 10 22 Uncertainty in time = +/- 3 secs [Prediction of 2008 Nov 16.0] Data for the target star ------------------------ * name: HIP 12975 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 46 52.9271 DE: +12 15 38.102 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .016, .014 ) * V mag [mag]: 7.6 * B mag [mag]: 7.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (345) Tercidina approx. diameter [km]: 108 approx. diameter ["]: .122 distance from Earth [AU]: 1.22400 * orbital information: orbit source: Preston date of fit: 2008 Nov 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 792 number of rejected observations: 139 time covered by the observations: 1901 Mar 27 - 2008 Aug 21 1 sigma uncertainty ellipse (major, minor, PA): 0.028, 0.015, 82° remarks: * orbital elements for (345) Tercidina : Mean anomaly = 325.48205256 deg Arg. of pericenter = 230.73982389 deg Long. of node = 212.69687991 deg Inclination = 9.74943572 deg Eccentricity = 0.06042665 Semimajor axis = 2.32496351 AU Perihelion dist = 2.18447376 AU Mag: H = 8.68, G = 0.10 Epoch of elements : MJD 55143.87000000 TDT (2009 Nov 08.870) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 8 345 Tercidina 20h 53.0m UT 7.6 2 46 52.927 12 15 38.10HIP 12975 7.7 11.1 108 10.4 1.224 -2.318 -24.65 40.2847 12.267 -137.31 -16.80 20.8841 -0.00501 0.00685 -4.72710 -3.43049 0.00018 0.00043 2000 324.406106200911 5.00000230.739824212.696880 9.7494360.06042665 2.3249635 2.1844738 8.7 5.00.10 RATE 2.7802250 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.021 84 1.20 0.024 0 54786.5020091108__12975 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 16, 18:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org