IOTA/IOTA-ES occultation update for (194) Prokne / 2UCAC 32681213 event on 2008 Oct 17, 08:29 UT Visible from E Canada Summary ------- On 2008 Oct 17 UT, the 168 km diameter asteroid (194) Prokne will occult a 12.1 mag star in the constellation Canis Minor 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 1.4 mag to 13.1 mag (the magnitude of the asteroid) for at most 13.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, 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: 2008 Oct 17, 08:21 - 2008 Oct 17, 08:27 UT * magnitude of target star: 12.1 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 13.5 * Moon: 91 % sunlit, 56° distance * Sun: 94° distance * rough path description: E Canada The occultation path -------------------- * approximate projected width [km]: 195 * 1 sigma uncertainty interval [path widths]: +/- 0.90 * 1 sigma uncertainty interval [seconds]: +/- 12.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .080 +/- .080) * 1 sigma uncertainty ellipse (major, minor, PA): ( .080", .080", 90° ) * approx speed of asteroid's shadow [km/s]: 12.5140 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 32681213 by 194 Prokne 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 - 35 0 0 35 13 37 8 27 26 57 197 -1 33 58 58 36 29 35 31 47 37 38 49 59 - 36 0 0 36 3 54 8 27 16 56 195 -2 34 49 11 37 19 56 32 37 42 39 40 30 - 37 0 0 36 53 46 8 27 6 55 193 -3 35 39 0 38 9 51 33 27 26 40 30 31 - 38 0 0 37 43 10 8 26 56 55 191 -4 36 28 23 38 59 17 34 16 46 41 19 59 - 39 0 0 38 32 4 8 26 46 54 189 -5 37 17 17 39 48 11 35 5 40 42 8 52 - 40 0 0 39 20 25 8 26 37 53 187 -6 38 5 40 40 36 30 35 54 6 42 57 9 - 41 0 0 40 8 12 8 26 27 53 185 -7 38 53 29 41 24 14 36 42 1 43 44 46 - 42 0 0 40 55 22 8 26 18 52 183 -7 39 40 44 42 11 19 37 29 23 44 31 42 - 43 0 0 41 41 53 8 26 10 51 182 -8 40 27 21 42 57 44 38 16 10 45 17 54 - 44 0 0 42 27 45 8 26 1 50 180 -9 41 13 20 43 43 27 39 2 22 46 3 23 - 45 0 0 43 12 54 8 25 52 50 178 -10 41 58 38 44 28 27 39 47 54 46 48 5 - 46 0 0 43 57 20 8 25 44 49 177 -11 42 43 14 45 12 43 40 32 48 47 31 59 - 47 0 0 44 41 1 8 25 36 48 175 -12 43 27 7 45 56 12 41 17 0 48 15 6 - 48 0 0 45 23 57 8 25 28 47 174 -12 44 10 15 46 38 54 42 0 30 48 57 22 - 49 0 0 46 6 6 8 25 21 47 172 -13 44 52 38 47 20 49 42 43 16 49 38 48 - 50 0 0 46 47 27 8 25 13 46 171 -14 45 34 14 48 1 54 43 25 18 50 19 23 - 51 0 0 47 28 0 8 25 6 45 170 -14 46 15 3 48 42 10 44 6 34 50 59 7 - 52 0 0 48 7 44 8 24 59 44 168 -15 46 55 5 49 21 36 44 47 5 51 37 58 - 53 0 0 48 46 39 8 24 53 43 167 -16 47 34 17 50 0 12 45 26 48 52 15 58 - 54 0 0 49 24 44 8 24 46 43 166 -16 48 12 41 50 37 57 46 5 44 52 53 5 - 55 0 0 50 1 59 8 24 40 42 165 -17 48 50 16 51 14 52 46 43 53 53 29 19 - 56 0 0 50 38 24 8 24 34 41 163 -18 49 27 2 51 50 56 47 21 14 54 4 41 - 57 0 0 51 13 59 8 24 28 40 162 -18 50 2 59 52 26 9 47 57 46 54 39 11 - 58 0 0 51 48 45 8 24 22 40 161 -19 50 38 6 53 0 31 48 33 31 55 12 50 - 59 0 0 52 22 40 8 24 17 39 160 -19 51 12 24 53 34 3 49 8 27 55 45 37 - 60 0 0 52 55 47 8 24 11 38 159 -20 51 45 53 54 6 45 49 42 36 56 17 33 - 61 0 0 53 28 4 8 24 6 37 158 -20 52 18 34 54 38 38 50 15 56 56 48 39 - 62 0 0 53 59 32 8 24 1 37 157 -21 52 50 26 55 9 42 50 48 29 57 18 54 - 63 0 0 54 30 12 8 23 56 36 156 -21 53 21 31 55 39 57 51 20 15 57 48 21 - 64 0 0 55 0 5 8 23 52 35 155 -22 53 51 48 56 9 24 51 51 14 58 17 0 - 65 0 0 55 29 11 8 23 47 35 153 -22 54 21 18 56 38 4 52 21 26 58 44 50 - 66 0 0 55 57 30 8 23 43 34 152 -22 54 50 2 57 5 57 52 50 53 59 11 54 - 67 0 0 56 25 3 8 23 39 33 151 -23 55 18 1 57 33 5 53 19 34 59 38 12 - 68 0 0 56 51 52 8 23 35 33 150 -23 55 45 14 57 59 27 53 47 30 60 3 44 - 69 0 0 57 17 56 8 23 31 32 149 -24 56 11 43 58 25 5 54 14 42 60 28 33 - 70 0 0 57 43 16 8 23 27 31 148 -24 56 37 29 58 49 59 54 41 10 60 52 37 - 71 0 0 58 7 54 8 23 23 31 147 -24 57 2 31 59 14 11 55 6 56 61 16 0 - 72 0 0 58 31 50 8 23 20 30 146 -25 57 26 52 59 37 41 55 31 59 61 38 40 - 73 0 0 58 55 4 8 23 17 29 145 -25 57 50 31 60 0 30 55 56 21 62 0 40 - 74 0 0 59 17 38 8 23 13 29 144 -25 58 13 30 60 22 38 56 20 2 62 22 0 - 75 0 0 59 39 33 8 23 10 28 143 -26 58 35 49 60 44 7 56 43 2 62 42 40 - 76 0 0 60 0 48 8 23 7 28 142 -26 58 57 28 61 4 58 57 5 24 63 2 43 - 77 0 0 60 21 26 8 23 4 27 141 -26 59 18 30 61 25 11 57 27 6 63 22 9 - 78 0 0 60 41 26 8 23 2 26 140 -26 59 38 54 61 44 46 57 48 11 63 40 58 - 79 0 0 61 0 50 8 22 59 26 139 -27 59 58 41 62 3 46 58 8 38 63 59 12 - 80 0 0 61 19 39 8 22 56 25 139 -27 60 17 53 62 22 11 58 28 29 64 16 51 - 81 0 0 61 37 52 8 22 54 25 138 -27 60 36 29 62 40 1 58 47 45 64 33 56 - 82 0 0 61 55 31 8 22 51 24 137 -27 60 54 31 62 57 17 59 6 25 64 50 29 - 83 0 0 62 12 37 8 22 49 24 136 -28 61 11 59 63 14 0 59 24 31 65 6 29 - 84 0 0 62 29 11 8 22 47 23 135 -28 61 28 54 63 30 11 59 42 3 65 21 58 - 85 0 0 62 45 12 8 22 45 23 134 -28 61 45 16 63 45 51 59 59 2 65 36 56 - 86 0 0 63 0 43 8 22 43 22 133 -28 62 1 7 64 1 0 60 15 29 65 51 24 - 87 0 0 63 15 43 8 22 41 22 132 -28 62 16 28 64 15 39 60 31 24 66 5 24 - 88 0 0 63 30 13 8 22 39 21 131 -29 62 31 18 64 29 48 60 46 48 66 18 54 - 89 0 0 63 44 14 8 22 37 21 130 -29 62 45 38 64 43 29 61 1 42 66 31 57 - 90 0 0 63 57 46 8 22 35 20 129 -29 62 59 29 64 56 42 61 16 7 66 44 33 - 91 0 0 64 10 51 8 22 33 20 128 -29 63 12 52 65 9 27 61 30 2 66 56 42 - 92 0 0 64 23 28 8 22 32 19 127 -29 63 25 48 65 21 46 61 43 28 67 8 26 - 93 0 0 64 35 38 8 22 30 19 126 -29 63 38 16 65 33 38 61 56 27 67 19 44 - 94 0 0 64 47 23 8 22 28 18 125 -29 63 50 17 65 45 5 62 8 58 67 30 37 - 95 0 0 64 58 41 8 22 27 18 124 -30 64 1 53 65 56 6 62 21 2 67 41 6 - 96 0 0 65 9 35 8 22 25 17 123 -30 64 13 3 66 6 44 62 32 40 67 51 12 - 97 0 0 65 20 4 8 22 24 17 122 -30 64 23 47 66 16 57 62 43 51 68 0 55 - 98 0 0 65 30 9 8 22 23 16 121 -30 64 34 8 66 26 46 62 54 38 68 10 14 - 99 0 0 65 39 51 8 22 21 16 121 -30 64 44 4 66 36 12 63 5 0 68 19 12 -100 0 0 65 49 9 8 22 20 16 120 -30 64 53 36 66 45 16 63 14 57 68 27 49 -101 0 0 65 58 5 8 22 19 15 119 -30 65 2 46 66 53 58 63 24 30 68 36 3 -102 0 0 66 6 38 8 22 18 15 118 -30 65 11 32 67 2 17 63 33 39 68 43 58 -103 0 0 66 14 50 8 22 17 14 117 -30 65 19 56 67 10 16 63 42 25 68 51 31 -104 0 0 66 22 40 8 22 16 14 116 -31 65 27 59 67 17 53 63 50 49 68 58 45 -105 0 0 66 30 9 8 22 15 13 115 -31 65 35 39 67 25 10 63 58 50 69 5 39 -106 0 0 66 37 17 8 22 14 13 114 -31 65 42 59 67 32 7 64 6 28 69 12 14 -107 0 0 66 44 4 8 22 13 13 113 -31 65 49 57 67 38 43 64 13 45 69 18 30 -108 0 0 66 50 32 8 22 12 12 112 -31 65 56 35 67 45 0 64 20 41 69 24 27 -109 0 0 66 56 40 8 22 11 12 111 -31 66 2 52 67 50 58 64 27 15 69 30 6 -110 0 0 67 2 28 8 22 10 11 110 -31 66 8 50 67 56 37 64 33 29 69 35 27 -111 0 0 67 7 57 8 22 9 11 109 -31 66 14 28 68 1 57 64 39 22 69 40 30 -112 0 0 67 13 7 8 22 8 11 108 -31 66 19 46 68 6 58 64 44 55 69 45 16 -113 0 0 67 17 59 8 22 8 10 107 -31 66 24 45 68 11 42 64 50 7 69 49 44 -114 0 0 67 22 31 8 22 7 10 107 -31 66 29 25 68 16 7 64 55 0 69 53 55 -115 0 0 67 26 46 8 22 6 9 106 -31 66 33 47 68 20 15 64 59 33 69 57 50 -116 0 0 67 30 42 8 22 6 9 105 -31 66 37 50 68 24 5 65 3 47 70 1 27 -117 0 0 67 34 21 8 22 5 9 104 -31 66 41 34 68 27 37 65 7 42 70 4 49 -118 0 0 67 37 42 8 22 4 8 103 -31 66 45 0 68 30 52 65 11 17 70 7 54 -119 0 0 67 40 45 8 22 4 8 102 -31 66 48 8 68 33 51 65 14 34 70 10 42 -120 0 0 67 43 31 8 22 3 8 101 -31 66 50 58 68 36 32 65 17 31 70 13 15 -121 0 0 67 45 59 8 22 3 7 100 -31 66 53 31 68 38 56 65 20 11 70 15 32 -122 0 0 67 48 11 8 22 2 7 99 -31 66 55 46 68 41 4 65 22 31 70 17 33 -123 0 0 67 50 5 8 22 2 6 98 -31 66 57 43 68 42 55 65 24 34 70 19 19 -124 0 0 67 51 42 8 22 2 6 97 -32 66 59 23 68 44 30 65 26 18 70 20 48 -125 0 0 67 53 3 8 22 1 6 96 -32 67 0 45 68 45 48 65 27 44 70 22 3 -126 0 0 67 54 6 8 22 1 5 95 -32 67 1 50 68 46 50 65 28 51 70 23 2 -127 0 0 67 54 53 8 22 0 5 94 -32 67 2 38 68 47 36 65 29 41 70 23 45 -128 0 0 67 55 23 8 22 0 5 94 -32 67 3 8 68 48 5 65 30 12 70 24 14 -129 0 0 67 55 36 8 22 0 4 93 -32 67 3 22 68 48 19 65 30 26 70 24 26 -130 0 0 67 55 33 8 22 0 4 92 -32 67 3 18 68 48 15 65 30 21 70 24 24 -131 0 0 67 55 13 8 21 59 3 91 -32 67 2 57 68 47 56 .. .. .. 70 24 6 -132 0 0 67 54 36 8 21 59 3 90 -32 67 2 19 68 47 21 .. .. .. 70 23 33 -133 0 0 67 53 42 8 21 59 3 89 -32 67 1 23 68 46 29 .. .. .. 70 22 45 -134 0 0 67 52 32 8 21 59 2 88 -32 67 0 11 68 45 21 .. .. .. 70 21 41 -135 0 0 67 51 5 8 21 59 2 87 -31 66 58 41 68 43 57 .. .. .. 70 20 22 -136 0 0 67 49 21 8 21 58 1 86 -31 66 56 54 68 42 16 .. .. .. 70 18 48 -137 0 0 67 47 20 8 21 58 1 85 -31 66 54 49 68 40 19 .. .. .. 70 16 58 -138 0 0 67 45 2 8 21 58 1 84 -31 66 52 27 68 38 5 .. .. .. 70 14 52 -139 0 0 67 42 27 8 21 58 0 83 -31 66 49 47 68 35 35 .. .. .. 70 12 30 Uncertainty in time = +/- 12 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: 2UCAC 32681213 * constellation : Canis Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 14 16.5895 DE: +02 51 27.238 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .079, .079 ) * V mag [mag]: 12.1 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (194) Prokne approx. diameter [km]: 168 approx. diameter ["]: .089 distance from Earth [AU]: 2.60700 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 857 number of rejected observations: 136 time covered by the observations: 1913 Apr 04 - 2008 Sep 25 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.010, 78° remarks: * orbital elements for (194) Prokne : Mean anomaly = 100.54753874 deg Arg. of pericenter = 162.94994793 deg Long. of node = 159.47628405 deg Inclination = 18.48523100 deg Eccentricity = 0.23577765 Semimajor axis = 2.61790380 AU Perihelion dist = 2.00066060 AU Mag: H = 7.67, G = 0.15 Epoch of elements : MJD 54756.35400000 TDT (2008 Oct 17.354) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 17 194 Prokne 8h 29.3m UT 12.1 7 14 16.590 2 51 27.242UCAC 32681213 0.0 13.1 168 13.5 2.607 1.264 -14.44 -44.9712 2.862 49.00 -9.44 8.4881 0.30682 0.40077 5.61919 -4.27950 -0.00569 0.00091 2000 99.06904120081011.00000162.949948159.476284 18.4852310.23577765 2.6179038 2.0006606 7.7 5.00.15 RATE 2.3268780 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.080 0.080 90 1.90 0.080 0 54740.5020081017_681213 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 05:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org