IOTA/IOTA-ES occultation update for (634) Ute / TYC 4975-00112-1 event on 2012 Dec 21, 12:53 UT Visible from W USA Summary ------- On 2012 Dec 21 UT, the 63 km diameter asteroid (634) Ute will occult a 11.1 mag star in the constellation Virgo for observers along a path across W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.0 mag to 16.1 mag (the magnitude of the asteroid) for at most 2.1 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: UCAC. The event at a glimpse ---------------------- * Rank: 60 * date and approx. time of event: 2012 Dec 21, 12:50 - 2012 Dec 21, 12:52 UT * geocentric midpoint of event [JD]: 2456283.03692083 * magnitude of target star: 11.1 * magnitude drop [mag]: 5.0 * estimated maximum duration [s]: 2.1 * Moon: 62 % sunlit, 159° distance * Sun: 60° distance * rough path description: W USA The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 1.03 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .023", 94° ) * approx speed of asteroid's shadow [km/s]: 29.9421 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4975-00112-1 by 634 Ute on 2012 Dec 21 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 -158 0 0 44 47 16 12 50 16 1 94 -54 44 26 32 45 8 4 .. .. .. 45 51 13 -157 0 0 44 44 32 12 50 16 1 95 -54 44 23 49 45 5 21 .. .. .. 45 48 30 -156 0 0 44 41 39 12 50 16 2 95 -53 44 20 55 45 2 28 .. .. .. 45 45 38 -155 0 0 44 38 37 12 50 16 3 96 -53 44 17 53 44 59 26 .. .. .. 45 42 37 -154 0 0 44 35 25 12 50 16 3 97 -52 44 14 40 44 56 14 43 32 13 45 39 26 -153 0 0 44 32 3 12 50 17 4 97 -51 44 11 19 44 52 53 43 28 50 45 36 5 -152 0 0 44 28 33 12 50 17 5 98 -51 44 7 47 44 49 23 43 25 18 45 32 36 -151 0 0 44 24 52 12 50 17 6 99 -50 44 4 7 44 45 43 43 21 37 45 28 57 -150 0 0 44 21 3 12 50 18 6 100 -49 44 0 17 44 41 54 43 17 46 45 25 8 -149 0 0 44 17 4 12 50 18 7 100 -49 43 56 18 44 37 55 43 13 46 45 21 10 -148 0 0 44 12 56 12 50 18 8 101 -48 43 52 9 44 33 47 43 9 37 45 17 3 -147 0 0 44 8 38 12 50 19 9 102 -47 43 47 51 44 29 30 43 5 18 45 12 47 -146 0 0 44 4 11 12 50 19 9 102 -47 43 43 24 44 25 4 43 0 50 45 8 22 -145 0 0 43 59 35 12 50 20 10 103 -46 43 38 47 44 20 28 42 56 13 45 3 47 -144 0 0 43 54 50 12 50 20 11 104 -45 43 34 2 44 15 44 42 51 26 44 59 3 -143 0 0 43 49 56 12 50 21 11 105 -44 43 29 7 44 10 50 42 46 30 44 54 10 -142 0 0 43 44 52 12 50 22 12 105 -44 43 24 3 44 5 47 42 41 25 44 49 8 -141 0 0 43 39 40 12 50 22 13 106 -43 43 18 50 44 0 35 42 36 12 44 43 57 -140 0 0 43 34 18 12 50 23 14 107 -42 43 13 28 43 55 14 42 30 49 44 38 37 -139 0 0 43 28 48 12 50 24 14 107 -42 43 7 57 43 49 44 42 25 17 44 33 8 -138 0 0 43 23 8 12 50 25 15 108 -41 43 2 17 43 44 5 42 19 36 44 27 30 -137 0 0 43 17 20 12 50 26 16 109 -40 42 56 28 43 38 17 42 13 46 44 21 44 -136 0 0 43 11 23 12 50 27 16 110 -39 42 50 31 43 32 20 42 7 47 44 15 48 -135 0 0 43 5 17 12 50 28 17 110 -39 42 44 24 43 26 15 42 1 40 44 9 44 -134 0 0 42 59 3 12 50 29 18 111 -38 42 38 9 43 20 1 41 55 24 44 3 31 -133 0 0 42 52 39 12 50 30 19 112 -37 42 31 46 43 13 39 41 48 59 43 57 10 -132 0 0 42 46 8 12 50 31 19 112 -37 42 25 13 43 7 7 41 42 25 43 50 40 -131 0 0 42 39 27 12 50 32 20 113 -36 42 18 32 43 0 28 41 35 44 43 44 1 -130 0 0 42 32 39 12 50 33 21 114 -35 42 11 43 42 53 40 41 28 53 43 37 14 -129 0 0 42 25 42 12 50 34 22 115 -34 42 4 46 42 46 43 41 21 55 43 30 19 -128 0 0 42 18 36 12 50 36 22 116 -34 41 57 40 42 39 38 41 14 48 43 23 15 -127 0 0 42 11 23 12 50 37 23 116 -33 41 50 26 42 32 25 41 7 33 43 16 4 -126 0 0 42 4 1 12 50 38 24 117 -32 41 43 4 42 25 4 41 0 9 43 8 44 -125 0 0 41 56 32 12 50 40 24 118 -31 41 35 33 42 17 35 40 52 38 43 1 16 -124 0 0 41 48 54 12 50 41 25 119 -31 41 27 55 42 9 58 40 44 59 42 53 40 -123 0 0 41 41 9 12 50 43 26 119 -30 41 20 9 42 2 13 40 37 12 42 45 56 -122 0 0 41 33 15 12 50 44 27 120 -29 41 12 16 41 54 21 40 29 17 42 38 5 -121 0 0 41 25 15 12 50 46 27 121 -28 41 4 14 41 46 20 40 21 14 42 30 5 -120 0 0 41 17 6 12 50 47 28 122 -27 40 56 5 41 38 13 40 13 4 42 21 59 -119 0 0 41 8 50 12 50 49 29 123 -27 40 47 49 41 29 57 40 4 47 42 13 45 -118 0 0 41 0 27 12 50 51 29 123 -26 40 39 25 41 21 34 39 56 22 42 5 23 -117 0 0 40 51 57 12 50 52 30 124 -25 40 30 54 41 13 5 39 47 50 41 56 54 -116 0 0 40 43 19 12 50 54 31 125 -24 40 22 16 41 4 27 39 39 11 41 48 18 -115 0 0 40 34 34 12 50 56 32 126 -24 40 13 31 40 55 43 39 30 24 41 39 35 -114 0 0 40 25 43 12 50 58 32 127 -23 40 4 39 40 46 52 39 21 31 41 30 45 -113 0 0 40 16 45 12 51 0 33 128 -22 39 55 40 40 37 55 39 12 32 41 21 49 -112 0 0 40 7 40 12 51 2 34 129 -21 39 46 35 40 28 50 39 3 25 41 12 45 -111 0 0 39 58 28 12 51 4 34 129 -20 39 37 23 40 19 39 38 54 13 41 3 35 -110 0 0 39 49 11 12 51 6 35 130 -20 39 28 5 40 10 22 38 44 53 40 54 19 -109 0 0 39 39 47 12 51 8 36 131 -19 39 18 40 40 0 59 38 35 28 40 44 57 -108 0 0 39 30 17 12 51 10 36 132 -18 39 9 10 39 51 29 38 25 57 40 35 28 -107 0 0 39 20 41 12 51 12 37 133 -17 38 59 33 39 41 54 38 16 19 40 25 54 -106 0 0 39 10 59 12 51 14 38 134 -17 38 49 51 39 32 12 38 6 36 40 16 13 -105 0 0 39 1 12 12 51 17 38 135 -16 38 40 4 39 22 26 37 56 48 40 6 27 -104 0 0 38 51 19 12 51 19 39 136 -15 38 30 10 39 12 33 37 46 54 39 56 36 -103 0 0 38 41 21 12 51 21 40 137 -14 38 20 12 39 2 35 37 36 54 39 46 39 -102 0 0 38 31 18 12 51 24 40 138 -13 38 10 8 38 52 33 37 26 50 39 36 37 -101 0 0 38 21 9 12 51 26 41 139 -13 38 0 0 38 42 25 37 16 41 39 26 30 -100 0 0 38 10 56 12 51 28 42 140 -12 37 49 46 38 32 12 37 6 27 39 16 18 - 99 0 0 38 0 39 12 51 31 42 141 -11 37 39 28 38 21 55 36 56 8 39 6 1 - 98 0 0 37 50 17 12 51 33 43 142 -10 37 29 6 38 11 33 36 45 45 38 55 40 - 97 0 0 37 39 50 12 51 36 44 144 -9 37 18 39 38 1 7 36 35 18 38 45 14 - 96 0 0 37 29 20 12 51 38 44 145 -8 37 8 9 37 50 37 36 24 47 38 34 45 - 95 0 0 37 18 46 12 51 41 45 146 -8 36 57 34 37 40 3 36 14 11 38 24 11 - 94 0 0 37 8 8 12 51 44 45 147 -7 36 46 56 37 29 25 36 3 33 38 13 34 - 93 0 0 36 57 26 12 51 46 46 148 -6 36 36 14 37 18 44 35 52 51 38 2 53 - 92 0 0 36 46 41 12 51 49 47 150 -5 36 25 29 37 7 59 35 42 5 37 52 9 - 91 0 0 36 35 53 12 51 52 47 151 -4 36 14 41 36 57 11 35 31 17 37 41 22 - 90 0 0 36 25 3 12 51 55 48 152 -4 36 3 50 36 46 21 35 20 25 37 30 32 - 89 0 0 36 14 9 12 51 57 48 153 -3 35 52 56 36 35 27 35 9 31 37 19 39 - 88 0 0 36 3 13 12 52 0 49 155 -2 35 42 0 36 24 32 34 58 35 37 8 43 - 87 0 0 35 52 15 12 52 3 49 156 -1 35 31 2 36 13 34 34 47 37 36 57 45 - 86 0 0 35 41 15 12 52 6 50 157 0 35 20 2 36 2 33 34 36 36 36 46 45 Uncertainty in time = +/- 3 secs Prediction of 2012 Dec 17.0 Data for the target star ------------------------ * name: TYC 4975-00112-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 06 39.2904 DE: -02 19 20.840 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .023, .021 ) * V mag [mag]: 11.1 * B mag [mag]: 11.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (634) Ute approx. diameter [km]: 63 approx. diameter ["]: .022 distance from Earth [AU]: 3.93700 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1198 number of rejected observations: 73 time covered by the observations: 1907 May 13 - 2012 Apr 10 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.009, 108° remarks: * orbital elements for (634) Ute : Mean anomaly = 212.09552324 deg Arg. of pericenter = 220.62925022 deg Long. of node = 133.46690763 deg Inclination = 12.28845440 deg Eccentricity = 0.18621770 Semimajor axis = 3.04532224 AU Perihelion dist = 2.47822934 AU Mag: H = 9.64, G = 0.15 Epoch of elements : MJD 56282.53700000 TDT (2012 Dec 21.537) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 21 634 Ute 12h 53.2m UT 11.1 14 6 39.290- 2 19 20.84TYC 4975-00112-1 11.9 16.1 63 2.1 3.937 2.480 -6.54 -72.1259 -2.320 -13.71 -23.44 12.8861 0.09451 0.56036 16.64409 -2.93087 -0.00476 0.00230 2000 211.62500720121219.00000220.629250133.466908 12.2884540.18621770 3.0453222 2.4782293 9.6 5.00.15 RATE 1.8546170 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.027 0.023 94 2.03 0.023 0 0 4 0 056278.0020121221_0112-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 06:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org