IOTA/IOTA-ES occultation update for (4711) Kathy / TYC 1319-01629-1 event on 2012 Dec 22, 02:08 UT Visible from USA Summary ------- On 2012 Dec 22 UT, the 12 km diameter asteroid (4711) Kathy will occult a 9.4 mag star in the constellation Orion for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 14.9 mag (the magnitude of the asteroid) for at most 1.0 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: 17 * date and approx. time of event: 2012 Dec 22, 01:59 - 2012 Dec 22, 02:17 UT * geocentric midpoint of event [JD]: 2456283.58943333 * magnitude of target star: 9.4 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.0 * Moon: 68 % sunlit, 74° distance * Sun: 172° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 3.92 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .070 +/- .046) * 1 sigma uncertainty ellipse (major, minor, PA): ( .071", .046", 83° ) * approx speed of asteroid's shadow [km/s]: 11.6567 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1319-01629-1 by 4711 Kathy on 2012 Dec 22 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 -130 0 0 30 13 50 2 17 40 0 71 -7 30 17 22 30 10 18 30 45 4 29 42 40 -129 0 0 30 32 5 2 17 40 1 71 -8 30 35 36 30 28 34 31 3 15 30 0 59 -128 0 0 30 49 58 2 17 39 2 72 -9 30 53 29 30 46 28 31 21 5 30 18 55 -127 0 0 31 7 30 2 17 39 3 72 -10 31 11 0 31 3 59 31 38 33 30 36 30 -126 0 0 31 24 39 2 17 38 4 73 -11 31 28 9 31 21 9 31 55 39 30 53 43 -125 0 0 31 41 26 2 17 38 5 73 -12 31 44 56 31 37 56 32 12 23 31 10 33 -124 0 0 31 57 51 2 17 37 6 74 -13 32 1 21 31 54 22 32 28 45 31 27 2 -123 0 0 32 13 54 2 17 36 7 74 -14 32 17 23 32 10 25 32 44 44 31 43 8 -122 0 0 32 29 35 2 17 35 7 75 -14 32 33 3 32 26 6 33 0 21 31 58 52 -121 0 0 32 44 53 2 17 34 8 75 -15 32 48 21 32 41 25 33 15 36 32 14 13 -120 0 0 32 59 49 2 17 32 9 76 -16 33 3 17 32 56 21 33 30 29 32 29 13 -119 0 0 33 14 23 2 17 31 10 76 -17 33 17 51 33 10 55 33 45 0 32 43 50 -118 0 0 33 28 35 2 17 29 11 77 -18 33 32 2 33 25 7 33 59 9 32 58 4 -117 0 0 33 42 24 2 17 28 12 77 -19 33 45 51 33 38 57 34 12 55 33 11 57 -116 0 0 33 55 51 2 17 26 13 78 -20 33 59 18 33 52 25 34 26 19 33 25 27 -115 0 0 34 8 56 2 17 24 14 79 -20 34 12 23 34 5 30 34 39 21 33 38 35 -114 0 0 34 21 39 2 17 22 14 79 -21 34 25 5 34 18 13 34 52 1 33 51 21 -113 0 0 34 34 0 2 17 20 15 80 -22 34 37 26 34 30 35 35 4 19 34 3 45 -112 0 0 34 45 59 2 17 18 16 80 -23 34 49 24 34 42 34 35 16 15 34 15 46 -111 0 0 34 57 36 2 17 15 17 81 -24 35 1 1 34 54 11 35 27 49 34 27 26 -110 0 0 35 8 50 2 17 13 18 81 -25 35 12 15 35 5 26 35 39 1 34 38 43 -109 0 0 35 19 43 2 17 10 19 82 -26 35 23 8 35 16 19 35 49 52 34 49 38 -108 0 0 35 30 14 2 17 8 19 83 -26 35 33 38 35 26 50 36 0 20 35 0 12 -107 0 0 35 40 23 2 17 5 20 83 -27 35 43 47 35 36 59 36 10 27 35 10 23 -106 0 0 35 50 11 2 17 2 21 84 -28 35 53 34 35 46 47 36 20 12 35 20 13 -105 0 0 35 59 36 2 16 59 22 84 -29 36 2 59 35 56 13 36 29 35 35 29 41 -104 0 0 36 8 40 2 16 56 23 85 -30 36 12 3 36 5 17 36 38 37 35 38 47 -103 0 0 36 17 22 2 16 53 23 86 -30 36 20 45 36 14 0 36 47 17 35 47 32 -102 0 0 36 25 43 2 16 50 24 86 -31 36 29 6 36 22 21 36 55 35 35 55 54 -101 0 0 36 33 42 2 16 47 25 87 -32 36 37 5 36 30 20 37 3 33 36 3 56 -100 0 0 36 41 20 2 16 43 26 88 -33 36 44 42 36 37 58 37 11 9 36 11 35 - 99 0 0 36 48 37 2 16 40 27 88 -34 36 51 59 36 45 15 37 18 23 36 18 54 - 98 0 0 36 55 32 2 16 36 27 89 -34 36 58 54 36 52 10 37 25 17 36 25 51 - 97 0 0 37 2 6 2 16 32 28 89 -35 37 5 27 36 58 44 37 31 49 36 32 26 - 96 0 0 37 8 18 2 16 29 29 90 -36 37 11 40 37 4 57 37 38 0 36 38 40 - 95 0 0 37 14 10 2 16 25 30 91 -37 37 17 31 37 10 49 37 43 50 36 44 33 - 94 0 0 37 19 40 2 16 21 31 91 -38 37 23 1 37 16 19 37 49 19 36 50 5 - 93 0 0 37 24 49 2 16 17 31 92 -38 37 28 10 37 21 29 37 54 27 36 55 15 - 92 0 0 37 29 38 2 16 13 32 93 -39 37 32 59 37 26 17 37 59 14 37 0 5 - 91 0 0 37 34 5 2 16 9 33 93 -40 37 37 26 37 30 44 38 3 40 37 4 33 - 90 0 0 37 38 11 2 16 5 34 94 -41 37 41 32 37 34 51 38 7 46 37 8 41 - 89 0 0 37 41 57 2 16 0 34 95 -41 37 45 17 37 38 37 38 11 30 37 12 27 - 88 0 0 37 45 22 2 15 56 35 95 -42 37 48 42 37 42 1 38 14 54 37 15 53 - 87 0 0 37 48 26 2 15 52 36 96 -43 37 51 46 37 45 6 38 17 57 37 18 58 - 86 0 0 37 51 9 2 15 47 37 97 -44 37 54 29 37 47 49 38 20 40 37 21 41 - 85 0 0 37 53 31 2 15 42 37 98 -45 37 56 51 37 50 11 38 23 2 37 24 4 - 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0 15 44 48 0 0 - 0 7 28 2 0 14 15 288 -11 - 0 3 54 - 0 11 2 0 24 7 - 0 38 58 49 0 0 - 0 30 29 2 0 11 14 288 -10 - 0 26 55 - 0 34 3 0 1 3 - 1 1 56 50 0 0 - 0 53 12 2 0 9 13 288 -8 - 0 49 39 - 0 56 46 - 0 21 44 - 1 24 37 51 0 0 - 1 15 38 2 0 7 12 288 -7 - 1 12 5 - 1 19 11 - 0 44 13 - 1 47 0 52 0 0 - 1 37 46 2 0 5 11 288 -6 - 1 34 13 - 1 41 19 - 1 6 24 - 2 9 5 53 0 0 - 1 59 35 2 0 3 10 288 -5 - 1 56 3 - 2 3 8 - 1 28 16 - 2 30 51 54 0 0 - 2 21 6 2 0 1 9 287 -4 - 2 17 34 - 2 24 38 - 1 49 49 - 2 52 18 55 0 0 - 2 42 17 1 59 59 8 287 -3 - 2 38 45 - 2 45 48 - 2 11 3 - 3 13 26 56 0 0 - 3 3 8 1 59 58 7 287 -2 - 2 59 36 - 3 6 39 - 2 31 57 - 3 34 14 57 0 0 - 3 23 38 1 59 57 6 287 -1 - 3 20 7 - 3 27 9 - 2 52 31 - 3 54 42 58 0 0 - 3 43 49 1 59 56 5 287 0 - 3 40 18 - 3 47 19 - 3 12 45 - 4 14 49 Uncertainty in time = +/- 6 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 1319-01629-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 20 01.7419 DE: +16 52 52.231 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .027 ) * V mag [mag]: 9.4 * B mag [mag]: 9.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4711) Kathy approx. diameter [km]: 12 approx. diameter ["]: .013 distance from Earth [AU]: 1.30400 * orbital information: orbit source: Preston date of fit: 2012 Nov 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 927 number of rejected observations: 12 time covered by the observations: 1975 Dec 30 - 2012 Nov 21 1 sigma uncertainty ellipse (major, minor, PA): 0.064, 0.037, 82° remarks: * orbital elements for (4711) Kathy : Mean anomaly = 66.02971917 deg Arg. of pericenter = 243.11578896 deg Long. of node = 113.89814887 deg Inclination = 10.22977835 deg Eccentricity = 0.25741992 Semimajor axis = 2.38258832 AU Perihelion dist = 1.76926264 AU Mag: H = 12.43, G = 0.15 Epoch of elements : MJD 56283.08900000 TDT (2012 Dec 22.089) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 22 4711 Kathy 2h 8.8m UT 9.4 6 20 1.742 16 52 52.23TYC 1319-01629-1 9.8 14.9 12 1.0 1.304 -2.933 14.03 -28.2319 16.878 147.46 -23.43 2.1464 0.07120 0.21376 -6.24201 2.07970 -0.00038 0.00065 2000 65.20187520121219.00000243.115789113.898149 10.2297780.25741992 2.3825883 1.769262612.2 5.00.15 RATE 2.6799740 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.071 0.046 83 4.92 0.050 0 0-1 1 056264.0020121222_1629-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 30, 00:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org