IOTA/IOTA-ES occultation update for (1197) Rhodesia / TYC 6739-00715-1 event on 2009 Feb 05, 21:06 UT Visible from Summary ------- On 2009 Feb 05 UT, the 48 km diameter asteroid (1197) Rhodesia will occult a 10.5 mag star in the constellation Hydra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.9 mag to 14.4 mag (the magnitude of the asteroid) for at most 2.9 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: 67 * date and approx. time of event: 2009 Feb 05, 21:00 - 2009 Feb 05, 21:07 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 3.9 * estimated maximum duration [s]: 2.9 * Moon: 81 % sunlit, 136° distance * Sun: 94° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 48 * 1 sigma uncertainty interval [path widths]: +/- 0.88 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .028", 93° ) * approx speed of asteroid's shadow [km/s]: 16.5936 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6739-00715-1 by 1197 Rhodesia on 2009 Feb 5 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 48 0 0 22 36 14 21 0 25 1 121 -83 22 21 4 22 51 23 21 54 22 23 18 4 49 0 0 22 2 30 21 0 25 2 121 -84 21 47 16 22 17 44 21 20 27 22 44 32 50 0 0 21 28 5 21 0 25 3 122 -84 21 12 47 21 43 23 20 45 51 22 10 18 51 0 0 20 53 0 21 0 25 4 122 -84 20 37 38 21 8 22 20 10 35 21 35 24 52 0 0 20 17 15 21 0 26 5 122 -84 20 1 49 20 32 41 19 34 39 20 59 50 53 0 0 19 40 50 21 0 27 6 123 -84 19 25 20 19 56 19 18 58 2 20 23 35 54 0 0 19 3 44 21 0 28 7 123 -84 18 48 10 19 19 18 18 20 46 19 46 41 55 0 0 18 26 0 21 0 29 8 123 -83 18 10 22 18 41 37 17 42 51 19 9 7 56 0 0 17 47 36 21 0 30 10 124 -82 17 31 55 18 3 18 17 4 17 18 30 54 57 0 0 17 8 35 21 0 31 11 124 -82 16 52 49 17 24 20 16 25 5 17 52 3 58 0 0 16 28 55 21 0 33 12 124 -81 16 13 6 16 44 44 15 45 15 17 12 34 59 0 0 15 48 39 21 0 34 13 125 -80 15 32 46 16 4 31 15 4 48 16 32 28 60 0 0 15 7 46 21 0 36 14 125 -79 14 51 49 15 23 42 14 23 45 15 51 45 61 0 0 14 26 18 21 0 38 15 125 -78 14 10 18 14 42 18 13 42 7 15 10 27 62 0 0 13 44 15 21 0 41 17 125 -77 13 28 11 14 0 18 12 59 55 14 28 33 63 0 0 13 1 38 21 0 43 18 126 -75 12 45 32 13 17 45 12 17 9 13 46 6 64 0 0 12 18 29 21 0 46 19 126 -74 12 2 19 12 34 39 11 33 51 13 3 6 65 0 0 11 34 49 21 0 48 20 126 -73 11 18 36 11 51 2 10 50 2 12 19 35 66 0 0 10 50 38 21 0 51 22 126 -72 10 34 22 11 6 55 10 5 43 11 35 32 67 0 0 10 5 59 21 0 54 23 126 -71 9 49 40 10 22 18 9 20 56 10 51 1 68 0 0 9 20 52 21 0 58 24 126 -70 9 4 30 9 37 14 8 35 41 10 6 2 69 0 0 8 35 19 21 1 1 25 127 -69 8 18 54 8 51 43 7 50 1 9 20 36 70 0 0 7 49 21 21 1 5 27 127 -67 7 32 54 8 5 48 7 3 56 8 34 45 71 0 0 7 3 1 21 1 9 28 127 -66 6 46 31 7 19 30 6 17 29 7 48 31 72 0 0 6 16 19 21 1 13 29 127 -65 5 59 47 6 32 51 5 30 42 7 1 55 73 0 0 5 29 18 21 1 17 30 127 -64 5 12 44 5 45 51 4 43 35 6 14 59 74 0 0 4 41 59 21 1 22 32 127 -62 4 25 23 4 58 34 3 56 11 5 27 45 75 0 0 3 54 24 21 1 26 33 127 -61 3 37 47 4 11 1 3 8 32 4 40 15 76 0 0 3 6 36 21 1 31 34 127 -60 2 49 57 3 23 14 2 20 39 3 52 30 77 0 0 2 18 35 21 1 36 35 127 -59 2 1 55 2 35 14 1 32 35 3 4 33 78 0 0 1 30 25 21 1 41 37 127 -57 1 13 44 1 47 5 0 44 22 2 16 25 79 0 0 0 42 6 21 1 46 38 127 -56 0 25 25 0 58 48 - 0 3 58 1 28 9 80 0 0 - 0 6 18 21 1 52 39 127 -55 - 0 23 0 0 10 24 - 0 52 24 0 39 47 81 0 0 - 0 54 45 21 1 57 41 127 -53 - 1 11 28 - 0 38 3 - 1 40 52 - 0 8 39 82 0 0 - 1 43 14 21 2 3 42 127 -52 - 1 59 57 - 1 26 32 - 2 29 22 - 0 57 8 83 0 0 - 2 31 42 21 2 9 43 127 -51 - 2 48 25 - 2 15 0 - 3 17 50 - 1 45 36 84 0 0 - 3 20 8 21 2 15 45 127 -50 - 3 36 50 - 3 3 26 - 4 6 15 - 2 34 2 85 0 0 - 4 8 28 21 2 21 46 127 -48 - 4 25 10 - 3 51 47 - 4 54 34 - 3 22 24 86 0 0 - 4 56 42 21 2 28 47 127 -47 - 5 13 23 - 4 40 1 - 5 42 45 - 4 10 39 87 0 0 - 5 44 46 21 2 34 48 127 -46 - 6 1 26 - 5 28 6 - 6 30 47 - 4 58 46 88 0 0 - 6 32 39 21 2 41 50 127 -44 - 6 49 18 - 6 16 0 - 7 18 36 - 5 46 42 89 0 0 - 7 20 18 21 2 47 51 127 -43 - 7 36 56 - 7 3 40 - 8 6 12 - 6 34 25 90 0 0 - 8 7 42 21 2 54 52 126 -42 - 8 24 18 - 7 51 6 - 8 53 32 - 7 21 53 91 0 0 - 8 54 48 21 3 1 54 126 -41 - 9 11 23 - 8 38 14 - 9 40 33 - 8 9 4 92 0 0 - 9 41 35 21 3 8 55 126 -39 - 9 58 8 - 9 25 3 -10 27 15 - 8 55 57 93 0 0 -10 28 1 21 3 15 56 126 -38 -10 44 32 -10 11 31 -11 13 35 - 9 42 28 94 0 0 -11 14 4 21 3 22 57 126 -37 -11 30 33 -10 57 36 -11 59 32 -10 28 38 95 0 0 -11 59 43 21 3 29 59 125 -36 -12 16 8 -11 43 17 -12 45 3 -11 14 23 96 0 0 -12 44 55 21 3 36 60 125 -34 -13 1 18 -12 28 32 -13 30 8 -11 59 42 97 0 0 -13 29 39 21 3 44 61 125 -33 -13 45 59 -13 13 19 -14 14 44 -12 44 34 98 0 0 -14 13 53 21 3 51 62 124 -32 -14 30 11 -13 57 36 -14 58 51 -13 28 57 99 0 0 -14 57 37 21 3 58 64 124 -31 -15 13 51 -14 41 23 -15 42 26 -14 12 49 100 0 0 -15 40 49 21 4 6 65 124 -29 -15 56 59 -15 24 38 -16 25 28 -14 56 9 101 0 0 -16 23 27 21 4 13 66 123 -28 -16 39 34 -16 7 19 -17 7 57 -15 38 57 102 0 0 -17 5 30 21 4 21 67 123 -27 -17 21 34 -16 49 26 -17 49 51 -16 21 10 103 0 0 -17 46 58 21 4 28 68 123 -26 -18 2 58 -17 30 57 -18 31 9 -17 2 47 104 0 0 -18 27 49 21 4 36 70 122 -25 -18 43 45 -18 11 52 -19 11 49 -17 43 49 105 0 0 -19 8 2 21 4 43 71 122 -23 -19 23 55 -18 52 9 -19 51 52 -18 24 12 106 0 0 -19 47 37 21 4 51 72 121 -22 -20 3 26 -19 31 48 -20 31 16 -19 3 58 107 0 0 -20 26 33 21 4 58 73 121 -21 -20 42 18 -20 10 48 -21 10 1 -19 43 4 108 0 0 -21 4 48 21 5 6 74 120 -20 -21 20 30 -20 49 7 -21 48 6 -20 21 31 109 0 0 -21 42 24 21 5 13 75 120 -19 -21 58 1 -21 26 47 -22 25 30 -20 59 18 110 0 0 -22 19 18 21 5 20 77 119 -18 -22 34 51 -22 3 45 -23 2 13 -21 36 23 111 0 0 -22 55 31 21 5 28 78 118 -17 -23 11 0 -22 40 2 -23 38 14 -22 12 48 112 0 0 -23 31 2 21 5 35 79 117 -16 -23 46 26 -23 15 37 -24 13 34 -22 48 30 113 0 0 -24 5 51 21 5 42 80 116 -14 -24 21 11 -23 50 30 -24 48 11 -23 23 31 114 0 0 -24 39 57 21 5 50 81 115 -13 -24 55 13 -24 24 41 -25 22 6 -23 57 49 115 0 0 -25 13 21 21 5 57 82 114 -12 -25 28 33 -24 58 9 -25 55 18 -24 31 24 116 0 0 -25 46 2 21 6 4 83 113 -11 -26 1 9 -25 30 54 -26 27 47 -25 4 17 117 0 0 -26 18 0 21 6 11 84 111 -10 -26 33 3 -26 2 57 -26 59 34 -25 36 27 118 0 0 -26 49 15 21 6 18 85 109 -9 -27 4 14 -26 34 16 -27 30 37 -26 7 53 119 0 0 -27 19 48 21 6 25 86 105 -8 -27 34 43 -27 4 53 -28 0 58 -26 38 37 120 0 0 -27 49 37 21 6 32 87 100 -7 -28 4 28 -27 34 46 -28 30 36 -27 8 38 121 0 0 -28 18 44 21 6 39 87 88 -6 -28 33 31 -28 3 57 -28 59 31 -27 37 57 122 0 0 -28 47 8 21 6 46 88 54 -5 -29 1 51 -28 32 25 -29 27 44 -28 6 32 123 0 0 -29 14 50 21 6 53 87 352 -4 -29 29 28 -29 0 11 -29 55 15 -28 34 25 124 0 0 -29 41 49 21 6 59 87 324 -3 -29 56 24 -29 27 15 -30 22 3 -29 1 35 125 0 0 -30 8 7 21 7 6 86 314 -2 -30 22 37 -29 53 36 -30 48 10 -29 28 4 126 0 0 -30 33 42 21 7 13 86 309 -1 -30 48 9 -30 19 15 -31 13 34 -29 53 50 127 0 0 -30 58 36 21 7 19 85 305 0 -31 12 59 -30 44 13 -31 38 17 -30 18 54 Uncertainty in time = +/- 4 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 6739-00715-1 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 22 15.4575 DE: -28 01 40.233 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .024 ) * V mag [mag]: 10.5 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1197) Rhodesia approx. diameter [km]: 48 approx. diameter ["]: .034 distance from Earth [AU]: 1.92700 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 751 number of rejected observations: 36 time covered by the observations: 1942 Aug 18 - 2008 Apr 15 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.014, 95° remarks: * orbital elements for (1197) Rhodesia : Mean anomaly = 13.80048368 deg Arg. of pericenter = 276.33173944 deg Long. of node = 256.08171865 deg Inclination = 12.95662568 deg Eccentricity = 0.23649425 Semimajor axis = 2.87965460 AU Perihelion dist = 2.19863284 AU Mag: H = 10.12, G = 0.15 Epoch of elements : MJD 54867.88000000 TDT (2009 Feb 05.880) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 5 1197 Rhodesia 21h 6.8m UT 10.5 14 22 15.458-28 1 40.23TYC 6739-00715-1 11.2 14.4 48 2.9 1.927 2.878 -19.32 122.7151 -28.022 -133.19 -15.68 21.1136 -0.00605 -0.01334 8.35373 -4.23501 -0.00526 0.00197 2000 12.2111332009 129.00000276.331739256.081719 12.9566260.23649425 2.8796546 2.198632810.0 5.00.15 RATE 2.0169430 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.028 93 1.88 0.030 0 54776.5020090205_0715-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org