IOTA/IOTA-ES occultation update for (1197) Rhodesia / TYC 1310-00663-1 event on 2012 Dec 07, 12:16 UT Visible from S USA, Mexico Summary ------- On 2012 Dec 07 UT, the 49 km diameter asteroid (1197) Rhodesia will occult a 11.6 mag star in the constellation Taurus for observers along a path across S USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.4 mag to 13.9 mag (the magnitude of the asteroid) for at most 3.8 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: 68 * date and approx. time of event: 2012 Dec 07, 12:08 - 2012 Dec 07, 12:24 UT * geocentric midpoint of event [JD]: 2456269.01133333 * magnitude of target star: 11.6 * magnitude drop [mag]: 2.4 * estimated maximum duration [s]: 3.8 * Moon: 41 % sunlit, 91° distance * Sun: 171° distance * rough path description: S USA, Mexico The occultation path -------------------- * approximate projected width [km]: 49 * 1 sigma uncertainty interval [path widths]: +/- 0.87 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .030", 97° ) * approx speed of asteroid's shadow [km/s]: 12.8663 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1310-00663-1 by 1197 Rhodesia on 2012 Dec 7 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 100 0 0 -18 9 56 12 24 34 1 67 -9 -17 55 32 -18 24 20 -17 30 28 -18 49 23 101 0 0 -17 45 42 12 24 34 2 67 -10 -17 31 16 -18 0 8 -17 6 9 -18 25 15 102 0 0 -17 21 2 12 24 34 3 67 -11 -17 6 34 -17 35 30 -16 41 24 -18 0 41 103 0 0 -16 55 57 12 24 33 4 66 -12 -16 41 27 -17 10 28 -16 16 13 -17 35 41 104 0 0 -16 30 27 12 24 33 5 66 -13 -16 15 55 -16 44 59 -15 50 37 -17 10 17 105 0 0 -16 4 32 12 24 32 6 66 -14 -15 49 58 -16 19 7 -15 24 37 -16 44 27 106 0 0 -15 38 13 12 24 31 7 66 -15 -15 23 37 -15 52 49 -14 58 12 -16 18 14 107 0 0 -15 11 30 12 24 30 8 65 -16 -14 56 52 -15 26 8 -14 31 24 -15 51 36 108 0 0 -14 44 24 12 24 28 9 65 -17 -14 29 44 -14 59 4 -14 4 12 -15 24 35 109 0 0 -14 16 54 12 24 27 10 65 -18 -14 2 12 -14 31 36 -13 36 37 -14 57 10 110 0 0 -13 49 2 12 24 25 11 65 -19 -13 34 18 -14 3 46 -13 8 40 -14 29 23 111 0 0 -13 20 48 12 24 23 12 64 -20 -13 6 3 -13 35 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- 94 0 0 27 14 22 12 8 28 18 285 -10 27 28 8 27 0 35 27 52 7 26 36 37 - 93 0 0 26 59 11 12 8 26 17 286 -9 27 12 59 26 45 22 27 37 0 26 21 21 - 92 0 0 26 43 31 12 8 23 16 286 -8 26 57 21 26 29 41 27 21 26 26 5 37 - 91 0 0 26 27 23 12 8 21 15 287 -7 26 41 15 26 13 31 27 5 23 25 49 24 - 90 0 0 26 10 47 12 8 19 14 287 -6 26 24 41 25 56 54 26 48 52 25 32 43 - 89 0 0 25 53 43 12 8 17 13 287 -5 26 7 39 25 39 47 26 31 53 25 15 33 - 88 0 0 25 36 11 12 8 15 12 288 -4 25 50 8 25 22 13 26 14 26 24 57 55 - 87 0 0 25 18 9 12 8 14 11 288 -3 25 32 9 25 4 10 25 56 31 24 39 49 - 86 0 0 24 59 40 12 8 12 10 289 -3 25 13 42 24 45 38 25 38 7 24 21 14 - 85 0 0 24 40 42 12 8 11 9 289 -2 24 54 46 24 26 38 25 19 14 24 2 10 - 84 0 0 24 21 15 12 8 9 9 290 -1 24 35 21 24 7 10 24 59 54 23 42 38 Uncertainty in time = +/- 4 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 1310-00663-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 37 55.3727 DE: +21 16 40.211 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .025, .023 ) * V mag [mag]: 11.6 * B mag [mag]: 12.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1197) Rhodesia approx. diameter [km]: 49 approx. diameter ["]: .038 distance from Earth [AU]: 1.76700 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 959 number of rejected observations: 35 time covered by the observations: 1942 Aug 18 - 2012 Nov 25 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.020, 100° remarks: * orbital elements for (1197) Rhodesia : Mean anomaly = 295.48507901 deg Arg. of pericenter = 276.71772969 deg Long. of node = 255.77695597 deg Inclination = 12.98441948 deg Eccentricity = 0.23084043 Semimajor axis = 2.88883181 AU Perihelion dist = 2.22197264 AU Mag: H = 10.13, G = 0.15 Epoch of elements : MJD 56268.51100000 TDT (2012 Dec 07.511) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 7 1197 Rhodesia 12h 16.3m UT 11.6 5 37 55.373 21 16 40.21TYC 1310-00663-1 12.0 13.9 49 3.8 1.767 -2.411 -13.09 -176.2729 21.282 -6.16 -22.68 12.2720 -0.00953 0.02426 -6.76941 -2.62936 -0.00099 0.00018 2000 293.77663320121129.00000276.717730255.776956 12.9844190.23084043 2.8888318 2.221972610.1 5.00.15 RATE 2.0073390 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.030 97 1.87 0.033 0 0-3 1 056264.0020121207_0663-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 22:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org