IOTA/IOTA-ES occultation update for (2105) Gudy / TYC 0812-01629-1 event on 2008 Oct 17, 07:51 UT Visible from E Canada Summary ------- On 2008 Oct 17 UT, the 22 km diameter asteroid (2105) Gudy will occult a 10.4 mag star in the constellation Cancer for observers along a path across E Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.8 mag (the magnitude of the asteroid) for at most 0.7 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: 30 * date and approx. time of event: 2008 Oct 17, 07:47 - 2008 Oct 17, 07:49 UT * midpoint of event [JD]: 2454756.8269625 * magnitude of target star: 10.4 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 0.7 * Moon: 91 % sunlit, 78° distance * Sun: 69° distance * rough path description: E Canada The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 2.20 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .030", 121° ) * approx speed of asteroid's shadow [km/s]: 30.1244 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0812-01629-1 by 2105 Gudy on 2008 Oct 17 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 Latitude Latitude Latitude Latitude - 23 0 0 40 44 29 7 49 3 55 153 0 40 36 26 40 52 32 40 1 7 41 28 2 - 24 0 0 41 22 28 7 49 0 54 152 -1 41 14 28 41 30 28 40 39 21 42 5 45 - 25 0 0 41 59 32 7 48 57 54 150 -2 41 51 35 42 7 29 41 16 41 42 42 33 - 26 0 0 42 35 42 7 48 54 53 149 -3 42 27 48 42 43 36 41 53 7 43 18 27 - 27 0 0 43 10 58 7 48 51 52 148 -4 43 3 7 43 18 49 42 28 39 43 53 27 - 28 0 0 43 45 20 7 48 49 51 147 -4 43 37 32 43 53 8 43 3 17 44 27 33 - 29 0 0 44 18 50 7 48 46 50 146 -5 44 11 5 44 26 35 43 37 3 45 0 47 - 30 0 0 44 51 27 7 48 43 49 145 -6 44 43 45 44 59 10 44 9 56 45 33 8 - 31 0 0 45 23 13 7 48 41 48 144 -7 45 15 34 45 30 52 44 41 57 46 4 38 - 32 0 0 45 54 8 7 48 38 48 143 -8 45 46 31 46 1 44 45 13 8 46 35 17 - 33 0 0 46 24 12 7 48 36 47 142 -8 46 16 39 46 31 46 45 43 28 47 5 6 - 34 0 0 46 53 27 7 48 33 46 141 -9 46 45 57 47 0 58 46 12 59 47 34 5 - 35 0 0 47 21 54 7 48 31 45 140 -10 47 14 26 47 29 21 46 41 40 48 2 16 - 36 0 0 47 49 32 7 48 29 44 139 -10 47 42 7 47 56 57 47 9 34 48 29 38 - 37 0 0 48 16 23 7 48 27 44 138 -11 48 9 1 48 23 45 47 36 40 48 56 14 - 38 0 0 48 42 27 7 48 25 43 137 -12 48 35 8 48 49 47 48 2 59 49 22 4 - 39 0 0 49 7 46 7 48 23 42 136 -12 49 0 30 49 15 3 48 28 33 49 47 8 - 40 0 0 49 32 21 7 48 21 41 135 -13 49 25 7 49 39 35 48 53 22 50 11 28 - 41 0 0 49 56 11 7 48 19 40 134 -14 49 49 0 50 3 22 49 17 26 50 35 3 - 42 0 0 50 19 18 7 48 17 40 133 -14 50 12 9 50 26 26 49 40 47 50 57 56 - 43 0 0 50 41 42 7 48 15 39 133 -15 50 34 36 50 48 48 50 3 25 51 20 7 - 44 0 0 51 3 25 7 48 13 38 132 -16 50 56 22 51 10 29 50 25 22 51 41 36 - 45 0 0 51 24 27 7 48 12 38 131 -16 51 17 26 51 31 28 50 46 37 52 2 25 - 46 0 0 51 44 49 7 48 10 37 130 -17 51 37 51 51 51 48 51 7 12 52 22 34 - 47 0 0 52 4 32 7 48 8 36 129 -17 51 57 36 52 11 28 51 27 7 52 42 3 - 48 0 0 52 23 36 7 48 7 36 128 -18 52 16 42 52 30 30 51 46 24 53 0 55 - 49 0 0 52 42 2 7 48 5 35 127 -19 52 35 11 52 48 54 52 5 2 53 19 9 - 50 0 0 52 59 51 7 48 4 34 126 -19 52 53 2 53 6 41 52 23 4 53 36 46 - 51 0 0 53 17 4 7 48 2 34 125 -20 53 10 17 53 23 52 52 40 28 53 53 47 - 52 0 0 53 33 41 7 48 1 33 124 -20 53 26 56 53 40 27 52 57 16 54 10 13 - 53 0 0 53 49 43 7 48 0 32 124 -21 53 43 0 53 56 27 53 13 29 54 26 4 - 54 0 0 54 5 11 7 47 58 32 123 -21 53 58 30 54 11 52 53 29 7 54 41 21 - 55 0 0 54 20 5 7 47 57 31 122 -22 54 13 26 54 26 44 53 44 12 54 56 4 - 56 0 0 54 34 25 7 47 56 30 121 -22 54 27 48 54 41 3 53 58 42 55 10 15 - 57 0 0 54 48 14 7 47 55 30 120 -23 54 41 38 54 54 49 54 12 40 55 23 53 - 58 0 0 55 1 30 7 47 54 29 119 -23 54 54 56 55 8 4 54 26 6 55 37 0 - 59 0 0 55 14 14 7 47 52 29 118 -24 55 7 42 55 20 47 54 38 59 55 49 36 - 60 0 0 55 26 28 7 47 51 28 117 -24 55 19 58 55 32 59 54 51 22 56 1 40 - 61 0 0 55 38 11 7 47 50 27 117 -25 55 31 43 55 44 41 55 3 14 56 13 15 - 62 0 0 55 49 25 7 47 49 27 116 -25 55 42 57 55 55 53 55 14 35 56 24 21 - 63 0 0 56 0 9 7 47 48 26 115 -26 55 53 43 56 6 35 55 25 27 56 34 57 - 64 0 0 56 10 24 7 47 47 26 114 -26 56 3 59 56 16 49 55 35 50 56 45 4 - 65 0 0 56 20 11 7 47 46 25 113 -26 56 13 47 56 26 34 55 45 43 56 54 44 - 66 0 0 56 29 29 7 47 45 24 112 -27 56 23 7 56 35 51 55 55 9 57 3 55 - 67 0 0 56 38 20 7 47 44 24 111 -27 56 31 59 56 44 41 56 4 6 57 12 39 - 68 0 0 56 46 43 7 47 44 23 111 -28 56 40 24 56 53 3 56 12 35 57 20 56 - 69 0 0 56 54 40 7 47 43 23 110 -28 56 48 21 57 0 58 56 20 38 57 28 47 - 70 0 0 57 2 9 7 47 42 22 109 -29 56 55 52 57 8 27 56 28 13 57 36 11 - 71 0 0 57 9 13 7 47 41 22 108 -29 57 2 56 57 15 29 56 35 22 57 43 9 - 72 0 0 57 15 50 7 47 40 21 107 -29 57 9 35 57 22 6 56 42 4 57 49 42 - 73 0 0 57 22 2 7 47 40 21 106 -30 57 15 47 57 28 17 56 48 21 57 55 49 - 74 0 0 57 27 48 7 47 39 20 105 -30 57 21 35 57 34 2 56 54 12 58 1 31 - 75 0 0 57 33 10 7 47 38 19 104 -31 57 26 56 57 39 23 56 59 37 58 6 48 - 76 0 0 57 38 6 7 47 37 19 104 -31 57 31 53 57 44 18 57 4 37 58 11 40 - 77 0 0 57 42 37 7 47 37 18 103 -31 57 36 25 57 48 49 57 9 11 58 16 8 - 78 0 0 57 46 44 7 47 36 18 102 -32 57 40 33 57 52 55 57 13 21 58 20 12 - 79 0 0 57 50 26 7 47 35 17 101 -32 57 44 16 57 56 37 57 17 7 58 23 51 - 80 0 0 57 53 45 7 47 35 17 100 -33 57 47 34 57 59 55 57 20 27 58 27 7 - 81 0 0 57 56 39 7 47 34 16 99 -33 57 50 29 58 2 49 57 23 24 58 29 59 - 82 0 0 57 59 9 7 47 34 16 98 -33 57 53 0 58 5 19 57 25 56 58 32 27 - 83 0 0 58 1 16 7 47 33 15 98 -34 57 55 6 58 7 25 57 28 4 58 34 32 - 84 0 0 58 2 58 7 47 33 15 97 -34 57 56 49 58 9 7 57 29 48 58 36 14 - 85 0 0 58 4 17 7 47 32 14 96 -34 57 58 9 58 10 26 57 31 8 58 37 32 - 86 0 0 58 5 13 7 47 32 14 95 -35 57 59 4 58 11 22 57 32 4 58 38 26 - 87 0 0 58 5 45 7 47 31 13 94 -35 57 59 36 58 11 53 57 32 36 58 38 58 - 88 0 0 58 5 53 7 47 31 12 93 -35 57 59 44 58 12 2 57 32 45 58 39 6 - 89 0 0 58 5 38 7 47 30 12 92 -36 57 59 29 58 11 47 57 32 29 58 38 51 - 90 0 0 58 4 59 7 47 30 11 92 -36 57 58 50 58 11 8 57 31 50 58 38 13 - 91 0 0 58 3 57 7 47 30 11 91 -36 57 57 48 58 10 6 57 30 47 58 37 12 - 92 0 0 58 2 31 7 47 29 10 90 -37 57 56 22 58 8 41 57 29 20 58 35 47 - 93 0 0 58 0 42 7 47 29 10 89 -37 57 54 32 58 6 51 57 27 29 58 33 59 - 94 0 0 57 58 29 7 47 28 9 88 -37 57 52 19 58 4 39 57 25 14 58 31 48 - 95 0 0 57 55 52 7 47 28 9 87 -38 57 49 42 58 2 2 57 22 36 58 29 13 - 96 0 0 57 52 51 7 47 28 8 87 -38 57 46 41 57 59 2 57 19 32 58 26 15 - 97 0 0 57 49 26 7 47 28 8 86 -38 57 43 15 57 55 37 57 16 5 58 22 53 - 98 0 0 57 45 37 7 47 27 7 85 -39 57 39 26 57 51 49 57 12 13 58 19 7 - 99 0 0 57 41 24 7 47 27 7 84 -39 57 35 12 57 47 36 57 7 56 58 14 57 -100 0 0 57 36 46 7 47 27 6 83 -39 57 30 34 57 42 59 57 3 15 58 10 23 -101 0 0 57 31 44 7 47 27 6 82 -40 57 25 30 57 37 58 56 58 9 58 5 24 -102 0 0 57 26 17 7 47 26 5 81 -40 57 20 2 57 32 31 56 52 37 58 0 1 -103 0 0 57 20 24 7 47 26 4 81 -40 57 14 9 57 26 40 56 46 40 57 54 14 -104 0 0 57 14 7 7 47 26 4 80 -41 57 7 51 57 20 23 56 40 18 57 48 1 -105 0 0 57 7 23 7 47 26 3 79 -41 57 1 6 57 13 41 56 33 30 57 41 23 -106 0 0 57 0 14 7 47 26 3 78 -41 56 53 56 57 6 32 56 26 15 57 34 19 -107 0 0 56 52 39 7 47 26 2 77 -41 56 46 20 56 58 58 56 18 34 57 26 49 -108 0 0 56 44 37 7 47 26 2 76 -42 56 38 17 56 50 58 56 10 26 57 18 54 -109 0 0 56 36 9 7 47 26 1 76 -42 56 29 47 56 42 30 56 1 51 57 10 32 -110 0 0 56 27 13 7 47 26 0 75 -42 56 20 50 56 33 36 55 52 49 57 1 43 Uncertainty in time = +/- 3 secs [Prediction of 2008 Sep 5.0] Data for the target star ------------------------ * name: TYC 0812-01629-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 01 47.7182 DE: +08 50 29.995 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 10.4 * B mag [mag]: 12.2 * Apparent position with proper motion RA(deg): 135.5681536203 DE(deg): 8.8084884705 * Equation of equinoxes (radians) : 0.000047063996808 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2105) Gudy approx. diameter [km]: 22 approx. diameter ["]: .014 distance from Earth [AU]: 2.23400 * orbital information: orbit source: Preston date of fit: 2008 Sep 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 423 number of rejected observations: 16 time covered by the observations: 1976 Feb 25 - 2007 Dec 16 1 sigma uncertainty ellipse (major, minor, PA): 0.043, 0.023, 128° remarks: * orbital elements for (2105) Gudy : Mean anomaly = 30.46032472 deg Arg. of pericenter = 156.22874609 deg Long. of node = 273.70451739 deg Inclination = 29.33459165 deg Eccentricity = 0.15040068 Semimajor axis = 2.38893943 AU Perihelion dist = 2.02964131 AU Mag: H = 11.15, G = 0.15 Epoch of elements : MJD 54756.32700000 TDT (2008 Oct 17.327) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 17 2105 Gudy 7h 50.8m UT 10.4 9 1 47.718 8 50 30.00TYC 0812-01629-1 12.2 15.8 22 0.7 2.234 3.354 -44.82 -8.4492 8.854 58.62 -9.43 7.8471 0.17496 0.19340 12.63046-11.38309 -0.00488 0.00118 2000 28.77146320081011.00000156.228746273.704517 29.3345920.15040068 2.3889394 2.029641311.3 5.00.15 RATE 2.6692940 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.030 121 3.20 0.030 0 54714.5020081017_1629-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 20:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org